Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

"Online First" included
Without submitted and only approved publications
Only approved publications

32227 Publications
Fast-neutron Induced Reactions at the nELBE Time-of-flight Facility
Junghans, A. R.; Beyer, R.; Elekes, Z.; Grosse, E.; Hannaske, R.; Koegler, T.; Massarczyk, R.; Schwengner, R.; Wagner, A.;
The compact neutron-time-of-flight facility nELBE at the superconducting electron accelerator ELBE of Helmholtz-Zentrum Dresden-Rossendorf is being rebuilt and extended with a low-background experimental hall. The neutron radiator consists of a liquid lead circuit without additional neutron moderators. The useful neutron spectrum extends from some tens of keV to about 10 MeV. nELBE is intended to deliver cross section data of fast-neutron nuclear interactions e.g. for the transmutation of nuclear waste and improvement of neutron physical simulations of innovative nuclear systems. Before the extension of the facility, the photon production cross section of 56 Fe was measured with an HPGe detector and the inelastic neutron scattering cross section to the first few excited states in Fe-56 was determined. The neutron total cross sections of Au and Ta were determined in the energy from 200 keV to 7 MeV in a transmission experiment.
Keywords: neutron time-of-flight, neutron induced reactions


Publ.-Id: 21758 - Permalink

Enhanced reactive transport process understanding by means of experiments and modelling at HZDR/IRE
Lippmann-Pipke, J.;
Es ist kein Abstract vorhanden.
  • Lecture (others)
    Helmholtz-Koordinierungstreffen, Forschung zu Endlagersystemen FZJ/IEK-6, KIT/INE, HZDR/IRE, 04.-05.03.2015, Jülich, Deutschland

Publ.-Id: 21757 - Permalink

A simple method for deadtime corrections in microbeam measurements.
Munnik, F.;
In microbeam measurements on inhomogeneous samples large variations in count-rate can occur. These variations result in variations in deadtime that have to be used to correct elemental distribution maps. However, the deadtime is usually not available on a pixel by pixel basis. In this work, a simple model is proposed to calculate the deadtime for each pixel. Measurements to determine the deadtime per event, needed in the model, are presented and the deadtime corrections are presented for real samples.
Keywords: dead time, PIXE
  • Poster
    14th International Conference on Particle Induced X-ray Emission (PIXE 2015), 26.02.-03.03.2015, Somerset West, South Africa

Publ.-Id: 21756 - Permalink

Eliashberg analysis of the optical conductivity in superconducting Pr2CuOx with x similar or equal to 4
Schachinger, E.; Chanda, G.; Lobo, R. P. S. M.; Naito, M.; Pronin, A. V.;
Superconducting Pr2CuOx, x similar or equal to 4 films with T' structure and a Tc of 27 K have been investigated by millimeter-wave transmission and broadband (infrared-to-ultraviolet) reflectivity measurements in the normal and superconducting state. The results obtained by both experimental methods show a consistent picture of the superconducting condensate formation below Tc. An Eliashberg analysis of the data proves d-wave superconductivity and unitary-limit impurity scattering of the charge carriers below Tc. The derived electron-exchange boson interaction spectral function I2chi(omega) shows only marginal changes at the superconducting transition with the mass enhancement factor lambda, the first inverse moment of I2chi(omega), being equal to 4.16 at 30 K and to 4.25 at 4 K.

Publ.-Id: 21755 - Permalink

Comparability and accuracy of nitrogen depth profiling in nitrided austenitic stainless steel
Manova, D.; Díaz, C.; Pichon, L.; Abrasonis, G.; Mändl, S.;
A comparative study of nitrogen depth profiles in low energy ion implantation nitrided austenitic stainless steel 1.4301 by glow discharge optical emission spectroscopy (GDOES), secondary ion mass spectrometry (SIMS) and nuclear reaction analysis (NRA) is presented. All methods require calibration either from reference samples or known scattering or reaction cross sections for the nitrogen concentration, while the methods producing a sputter crater – SIMS and GDOES – need additional conversion from sputter time to depth. NRA requires an assumption of material density for a correct conversion from the ‘natural’ units inherent to all ion beam analysis methods into ‘conventional’ depth units. It is shown that a reasonable agreement of the absolute concentrations and very good agreement of the layer thickness is obtained. The observed differences in broadening between the nitrogen distribution near the surface and the deeper region of the nitrided layer–steel interface are discussed on the basis of surface contaminations, surface roughening and energy straggling effects.
Keywords: GDOES SIMS NRA Austenitic stainless steel Expanded austenite

Publ.-Id: 21754 - Permalink

Towards Atomic Physics in PIConGPU
Huebl, A.; Garten, M.; Widera, R.; Huang, L.; Kluge, T.; Bussmann, M.;
Particle-in-Cell (PIC) codes are a ubiquitous tool to study laser-plasma physics in a fully relativistic environment. Theoretical models for plasma based accelerators and corresponding experiments, as planned by the HIBEF collaboration (XFEL), depend dramatically on the ability to precisely predict the complex processes inside of targets.

Unfortunately, basic atomic processes like the ionization dynamics of solid foil target in ultra-high fields of modern short-pulse laser systems in the PW class are not covered by the basic PIC algorithm. This talk shows ways to introduce the microscopic ionization dynamics inside the targets in a self-consistent and rigorous way. Combined with modern compute hardware such as GPUs and manycore systems in general, this paves the road to a new quality of multi-physics simulations with ab-initio modeling of atomic processes in strong laser fields.
Keywords: PIC, GPU, Ionization, CUDA, PIConGPU, HPC, HIBEF
  • Lecture (Conference)
    DPG-Frühjahrstagung: FV Kurzzeitphysik und Plasmaphysik, 02.-05.03.2015, Bochum, Deutschland

Publ.-Id: 21753 - Permalink

Heating and Ionization Dynamics in Solid Density Plasmas Driven by Ultra-short Relativistic Lasers
Huang, L. G.; Kluge, T.; Bussmann, M.; Cowan, T. E.;
The dynamics of heating and ionization, which determines the crucial plasma parameters such as temperature, free electron density and so on, is one of the fundamental issues in the realm of ultra-short relativistic laser-solid target interactions. We present our work on investigation of heating and ionization dynamics in solid copper target irradiated by ultra-short intense laser using two dimensional particle-in-cell simulations. The simulation results show that the bulk electron temperature is very sensitive to the initial preplasma scale length. By varying the preplasma scale length from 0 to 0.1 λ_0, the bulk electron temperatures in the interest of region increase from ~26 eV to ~109 eV, which agrees very well with the theory based on Ohmic heating mechanism by treating the return current correctly. The bulk electron heating is finally translated into bulk ionization, which leads to the average Cu ion charge state increasing from ~4.3 to ~10.7.
Keywords: Heating,Ionization,Return Current
  • Lecture (Conference)
    DPG-Frühjahrstagung, 02.-05.03.2015, Bochum, Deutschland

Publ.-Id: 21752 - Permalink

Spectroscopic identification of Np(V) sorption complexes at the mineral oxide-water interface
Müller, K.; Steudtner, R.; Huittinen, N.; Bok, F.; Rossberg, A.;
Neptunium (Np) is one of the most important components of nuclear waste to consider for the long-term safety assessment of nuclear waste repositories, due to the increasing enrichment through decay of Am-241, the long half-life and the high toxicity of Np-237. Hence, great attention is attracted to its geochemistry [1]. The molecular processes occurring at the solid-water interfaces present in the biogeosphere, strongly affect its migration [2]. Components of geological materials, such as metal oxides and hydroxides with a widespread environmental presence, high sorption capacity and tendency to form coatings on mineral surfaces, play an important role in regulating the Np mobility [3].
For a better understanding of the molecular events occurring at the mineral surfaces, x-ray absorption and vibrational spectroscopies are useful tools for the in-situ identification of actinyl surface species. In addition, time-resolved measurements provide kinetic information on the surface reactions [4].
In this work, Np(V) sorption on the oxyhydroxides of Fe, Mn, and Al is investigated by a combination of in-situ ATR FT-IR and EXAFS spectroscopies under a variety of environmentally relevant sorption conditions. By comparing Np(V) surface complexation reactions on hematite, magnetite, birnessite, and corrundum a very similar sorption behavior, namely the formation of one single inner-sphere complex can be elucidated. The spectroscopic results improve the geochemical transport modeling of Np(V) macroscopic data [4].

[1] Kaszuba, J.P. et al. (1999) Environ. Sci. Technol. 33, 4427-4433.
[2] O'Day, P.A. (1999) Rev. Geophys. 37, 249-274.
[3] Tochiyama, O. et al. (1996) Radiochim. Acta 73, 191-198.
[4] Müller, K. et al. (2015) Environ. Sci. Technol. 49, 2560-2567.
  • Lecture (Conference)
    Goldschmidt 2015, 16.-21.08.2015, Prague, Czech Republic

Publ.-Id: 21751 - Permalink

Use of spectroscopic and microscopic methods to reveal the evidence of U(VI) sorption on Acidovorax facilis isolated from subsurface environments
Krawczyk-Bärsch, E.; Gerber, U.; Steudtner, R.; Arnold, T.;
U(VI) biosorption experiments were performed using isolated Acidovorax facilis cell. From TRLFS measurements it can be concluded that phosphoryl groups are the main binding sites for uranyl, located in the lipopolysaccharide (LPS) unit in the outer membrane by Gram-negative Acidovorax facilis cells. In addition, EF-TEM/EELS studies provide microscopically and spectroscopically evidence of U sorbed at the outer membrane of Acidovorax facilis cells by showing high electron density and U ionization intensity peaks. The results support the TRLFS measurements and contribute to a better understanding of the binding mechanisms of U(VI) on Acidovorax facilis cells.
Keywords: Acidovorax facilis, Uranium, sorption, EF-TEM/EELS, TRLFS
  • Lecture (Conference)
    Environmental Radioactivity 2015 Conference, 21.-25.09.2015, Thessaloniki, Greece

Publ.-Id: 21750 - Permalink

Kompromissbereite Supraleitung
Zwicknagl, G.; Wosnitza, J.;
Hohe Magnetfelder und Supraleitung vertragen sich üblicherweise nicht: Das Magnetfeld favorisiert parallel ausgerichtete Elektronenspins, während die Supraleitung Cooper-Paare mit antiparallelen Spins voraussetzt. Daher sollte bei ausreichend großen Feldern die Supraleitung zusammenbrechen. Wie Fulde und Ferrell sowie Larkin und Ovchinnikov bereits 1964 vorhergesagt haben, können räumlich getrennte supraleitende sowie magnetisch geordnete Bereiche aber auch bei noch höheren Magnetfeldern koexistieren.
  • Physik Journal 14(2015)3, 31-36

Publ.-Id: 21748 - Permalink

Novel phase transition and metastable regions in the frustrated magnet CdCr2O4
Zherlitsyn, S.; Tsurkan, V.; Zvyagin, A. A.; Yasin, S.; Erfanifam, S.; Beyer, R.; Naumann, M.; Green, E.; Wosnitza, J.; Loidl, A.;
A new magnetic phase transition, which we assign to the separation of two different spiral phases, has been observed by ultrasound studies below the Néel temperature (TN = 7.8 K) in the frustrated antiferromagnet CdCr2O4. This transition renormalizes the velocity and amplitude of the transverse acoustic mode cT whereas the longitudinal mode cL is not affected. The specific heat does not show any significant change in the entropy at this transition. Furthermore, in an applied magnetic field, the mode cT exhibits extended metastable magnetostructural states neighboring the one-half magnetization plateau in CdCr2O4. By applying an exchange-striction model we can quantitatively describe the field dependence of the sound velocity below and above the one-half magnetization plateau.

Publ.-Id: 21747 - Permalink

Direct measurements of the magnetocaloric effect in pulsed magnetic fields: The example of the Heusler alloy Ni50Mn35In15
Ghorbani Zavareh, M.; Salazar Mejia, C.; Najak, A. K.; Skourski, Y.; Wosnitza, J.; Felser, C.; Nicklas, M.;
We have studied the magnetocaloric effect (MCE) in the shape-memory Heusler alloy Ni50Mn35In15 by direct measurements in pulsed magnetic fields up to 6 and 20 T. The results in 6 T are compared with data obtained from heat-capacity experiments. We find a saturation of the inverse MCE, related to the first-order martensitic transition, with a maximum adiabatic temperature change of ΔTad= - 7 at 250 K and a conventional field-dependent MCE near the second-order ferromagnetic transition in the austenitic phase. The pulsed magnetic field data allow for an analysis of the temperature response of the sample to the magnetic field on a time scale of 10 to 100 ms, which is on the order of typical operation frequencies (10–100 Hz) of magnetocaloric cooling devices. Our results disclose that in shape-memory alloys, the different contributions to the MCE and Hysteresis effects around the martensitic transition have to be carefully considered for future cooling applications.

Publ.-Id: 21746 - Permalink

Ultrasmall Nanomaterials for Multimodal Imaging
Stephan, H.;
kein Abstract verfügbar
  • Lecture (Conference)
    Gründungsveranstaltung der Deutschen Plattform NanoBioMedizin, DECHEMA, 04.03.2015, Frankfurt/Main, Deutschland

Publ.-Id: 21745 - Permalink

New Approaches for Prediction of Gas Holdups and Validation of the Mixing Length Concept in Gas-Liquid and Slurry Bubble Columns
Nedeltchev, S.; Schubert, M.;
The successful prediction of gas holdups in (slurry) bubble columns is very important for both the design and scale-up of these reactors. In the literature hitherto there are only few reliable empirical gas holdup correlations (mainly for gas-liquid bubble columns). In this work, a new approach has been developed for predicting the gas holdups at ambient conditions in gas-liquid bubble columns (0.095 and 0.102 m in ID) operated with 21 pure organic liquids, 17 liquid mixtures and tap water. The same approach was also applied for prediction of gas holdups in a slurry bubble column (0.095 m in ID) operated with 7 three-phase systems under ambient conditions.
The new model for gas holdup prediction in (slurry) bubble columns is based on the theoretical calculation of the gas-liquid interfacial area: a=6ɛg/ds. This correlation is explicitly valid for rigid spherical bubbles. In the case of slurry bubble columns, an empirical correlation developed by Schumpe et al. (1987) for the interfacial area prediction is frequently used. When both correlations are set equal, then the theoretical gas holdup can be calculated provided that one knows how to estimate the Sauter-mean bubble diameter ds and the effective viscosity μeff. The same approach was also applied to gas-liquid bubble columns. However, the interfacial areas were estimated by the empirical correlation of Akita and Yoshida (1974).
In the above-mentioned approaches the estimation of the Sauter-mean bubble diameters ds was based on empirical correlations (Wilkinson et al. (1994) for bubble columns and Lemoine et al. (2008) for slurry bubble columns).
For given gas-liquid-solid system, gas distributor layout and column diameter, the ds value is a function of both the superficial gas velocity and gas holdup (1-ɛg)^1.56 (Lemoine et al., 2008). Following the above-described approach, the ɛg value was calculated (based on a trial and error method) from the ratio ɛg/(1-ɛg)^1.56. The obtained ɛg value in this way was multiplied by a correction factor (a function of Eӧtvӧs number Eo) since the formed bubbles under the tested experimental conditions were oblate ellipsoidal (i.e. non-spherical). In the case of slurry bubble columns, the Eo number was based on the slurry density ρSL.
Following the above-described approach in two-phase bubble columns, it was found that for given gas-liquid system, column diameter and Ug value the theoretical gas holdup could be estimated from the simplified correlation: ɛg^0.13=const. Then the obtained ɛg value was also multiplied by a correction factor (a function of Eo). So, the objective of this part of the research work was to find the best expressions for the correction factors in two-phase and three-phase bubble columns, which fit successfully the experimental gas holdups ɛg.
The determination of the scale of liquid mixing in the main hydrodynamic regimes of bubble column operation is also of essential importance for their design and scale-up. In this context, a new method (and correlation) has been proposed by Kawase and Tokunaga (1991) for the determination of the mixing length (L). The parameter L characterizes the degree and scale of mixing. It can be also associated with the distance over which a turbulent eddy retains its identity.
In this work, a new definition of entropy (E) has been developed on the basis of gas holdup time series data measured by a conductivity wire-mesh sensor in an air-water bubble column (0.15 m in ID). The new entropy has been estimated by means of multiple reconstructions of the signal. It was found that in the Ug range from 0.034 to 0.101 m/s (see Fig. 2), the entropy (E) decreased monotonously and it was correlated to the mixing length L (a function of both column diameter Dc and Ug^−0.38). Secondly, a newly defined information entropy (IE) has been also extracted from the gas holdup fluctuations and correlated to the mixing length in almost the same Ug range (0.022−0.101 m/s).
In a previous publication (Nedeltchev et al., 2014), it was shown that the Kolmogorov entropy (KE) and a new statistical parameter (called “maximum number of signal’s visits in a region” Nvmax) were capable of identifying the range of applicability (0.034≤ Ug≤0.112 m/s) of the mixing length concept. Another statistical parameter F (average/(3×average absolute deviation)) was also introduced by Nedeltchev and Schubert (2015) for validating the range of applicability of the mixing length concept. It was also found that the F index is a function of the mixing length L in the Ug range from 0.034 to 0.112 m/s.
In this work, a comparison of the results obtained by the five different parameters (E, IE, KE, Nvmax and F) is performed. Most of them (except for KE) are new and such a comparison has not been reported in the literature hitherto. It revealed that the determination of the boundaries of the transition flow regime and the range of applicability of the mixing length concept depends to some extent on the parameter used. Based on the above-mentioned parameters it was found that the mixing length concept was applicable only in the transition flow regime. Such a result has not been reported in the previous papers (for instance, in Kawase and Tokunaga, 1991).
Keywords: Gas-liquid bubble columns, Slurry bubble columns, Gas holdup modelling, Mixing length, Applicability range
  • Lecture (Conference)
    12th International Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS12), 28.06.-01.07.2015, New York, USA

Publ.-Id: 21744 - Permalink

Radiolabelling of colloids for highly sensitive detection in complex systems
Hildebrand, H.; Schymura, S.; Barthen, R.; Bellido, E.; Ojea-Jiménez, I.; Cydzik-Giacchin, I.; Kozempel, J.; Dalmiglio, M.; Bulgheroni, A.; Cotogno, G.; Simonelli, F.; Gründig, M.; Kulenkampff, J.; Holzwarth, U.; Gibson, N.; Lippmann-Pipke, J. K. F.;
Colloids and nanoparticulate matter play an important role in the environment since they can act as carriers for (toxic) compounds and thereby enhance migration of substances that might normally be immobile under the given environmental conditions. The carrier properties of colloidal clay particles, humic substances and silica actinide colloids may play an important role in nuclear waste repositories. However, monitoring of these colloids in complex systems such as geological formations or groundwater is nearly impossible using conventional methods, especially at environmentally relevant concentrations and the high background load of other colloids or dissolved species of the same element. This obstacle can be overcome by the use of radiolabelling, which may be of crucial value in enabling such research.
We have developed various methods of introducing radiotracers into natural organic colloids such as humic or fulvic acids [1] and some of the most common technical nanoparticles, such as Ag0 [2], carbon and TiO2 nanoparticles [3]. Current studies are dealing with radiolabelling of CeO2 and quantum dots.
Five different approaches can be pursued in the radiolabelling of colloids or nanoparticles:
(1) Radiosynthesis – the synthesis of a compound using radioactive material
(2) Radiochemistry – the binding of a radioactive tracer to an existing compound
(3) In-diffusion – the in-diffusion of radioisotopes into existing particles
(4) Direct Activation – the activation of existing particles by proton irradiation
(5) Recoil labelling – the implantation of radionuclides into an existing particles using the recoil of a nuclear reaction

Radiosynthesis can be used to produce custom-made radiolabelled nanoparticles provided a suitable radiotracer is available. If the labelling is isotopic no difference in properties compared to non-radioactive particles are expected. We used this method to produce radiolabelled [105/110mAg]Ag nanoparticles.
Binding a radiotracer to a compound is a way of radiolabelling existing commercial or natural materials by a suitable radiochemical protocol. Carbon nanotubes and humic acids were successfully labelled with radioactive Iodine following the one-pot Iodogen method to yield [124/125/131I]CNTs and [125I]humic acid. No significant change in properties was detected compared to the original compounds.
Commercial TiO2 and Ag0 nanoparticles were labelled by the in-diffusion of isotopic radionuclides into surface defects and lattice structure at elevated temperatures. The resulting [110mAg]Ag0 and [44/45Ti]TiO2 nanoparticles showed no change in properties and the radiolabel proved to be stable under various conditions.
If a cyclotron is available, nanoparticles can be radiolabelled by activation via proton irradiation. The proton irradiation causes a nuclear reaction in the nanopowder producing the radiolabel inside the particles. Commercial TiO2 particles were labelled with 48V via a 48Ti(p,n)48V reaction.
If no suitable radiotracers/nuclear reactions are available for the above described methods, nanoparticles can be labelled utilising the recoil of a nuclear reaction to implant a radiotracer. Typically a mixture of a lithium compound and the to-be-labelled particles is irradiated with protons. The nuclear reaction 7Li(p,n)7Be produces 7Be which is implanted in the nanoparticles due to the recoil of the nuclear reaction. [7Be]MWCNT were produced successfully.
Table 1 shows the results for radiolabelling of particles. The described methods are adaptable for a wide range of other nanoparticles or colloids. The so-labelled nanoparticles can be detected at minimal concentrations well in the ng/L range even with a background of the same element and without complicated sample preparations necessary. In the research area of radioactive waste repositories the radiolabelling of humic substances, clay colloids and actinide silica colloids may be of particular interest.

Table 1: Comparison of the radiolabelling procedures and the resulting radiolabelled NP analysis.
Radiolabeling procedure Resulting NP Half-life of the radionuclide Activity concentration [MBq/mg] Detection limit [ng/L]
Radiosynthesis [110mAg]Ag0 250 d 1.5 33
[105Ag]Ag0 41.3 d 0.65 77

Radiochemistry [124I]CNT 4.2 d 8.0 6
[125I]CNT 59.4 d 19.9 2
[131I]CNT 8.0 d 3.7 14

In-Diffusion [110mAg]Ag 250 d 1 50
[44Ti]TiO2 60.4 a 0.01 5000
[45Ti]TiO2 3.08 h 135 0.5

Direct Activation [48V]TiO2 15.97 d 3.7 14
[7Be]MWCNT 53.29 d 0.041 1000

Recoil Labelling [7Be]TiO2 0.3 170
[7Be]SiO2 [4] 53.29 d 1.4 36
[7Be]MWCNT 0.055 1000
[1] Franke, K., Patt, J.T., Kupsch, H., Warwick, P.: Radioiodination of Humic Substances via Azocoupling with 3-[125I]Iodoaniline. Environ Sci Technol 42(11) (2008) 4083 - 4087.
[2] Hildebrand, H., Franke, K.: A new radiolabeling method for commercial Ag0 nanopowder with 110mAg for sensitive nanoparticle detection in complex media. J Nanopart Res 14 (2012) 1142.
[3] Hildebrand, H., Schymura, S., Holzwarth, U., Gibson, N., Dalmiglio, M., Franke, K.: Strategies for radiolabeling of commercial TiO2 nanopowder as a tool for sensitive nanoparticle detection. J Nanopart Res, submitted.
[4] Holzwarth, U., Bellido, E., Dalmiglio, M., Kozempel, J., Cotogno, G., Gibson, N.: 7Be-recoil radiolabelling of industrially manufactured silica nanoparticles. J Nanopart Res 16 (2014) 2574.
  • Poster
    3nd BELBaR Annual Meeting, 05.-06.03.2015, Madrid, Spain

Publ.-Id: 21743 - Permalink

Frequency dependence of an alternating magnetic field driven flow
Cramer, A.; Galindo, V.; Zennaro, M.;
The flow induced by a single-phase alternating magnetic field (AMF) is studied mainly numerically, and by two preliminary experiments of quite different size. For validation, the well known dependence of the characteristic velocity on magnetic induction is reproduced experimentally and in the simulations. It is shown that the flow structure depends drastically on the frequency of the AMF. An investigation of the change of the characteristic velocity with frequency results in a quantitative difference of flows in an AMF compared to rotating and travelling magnetic fields.
Keywords: PACS:, 47.15.Rq, 47.85.M-
  • Magnetohydrodynamics 51(2015)1, 133-147

Publ.-Id: 21741 - Permalink

Comparison of New Entropy Profiles in Bubble Columns Operated with Air-Water and Air-Therminol Systems
Nedeltchev, S.; Hampel, U.; Schubert, M.;
In a bubble column (0.15 m in ID) operated with an air-water system, a new entropy was extracted from gas holdup fluctuations measured by conductivity wire-mesh sensor. It was capable of identifying three transition velocities Utrans at 0.045, 0.089 and 0.112 m/s. In a different bubble column (0.162 m in ID) operated with an air-therminol LT system at ambient conditions, the new entropy was extracted from photon count time series measured by computed tomography. Three Utrans values were also identified at 0.03, 0.08 and 0.1 m/s. The information entropies yielded similar results.
Based on the new entropy results it can be concluded that the type of fluid and gas sparger used do not affect significantly the second and third Utrans values. There is an effect on the first Utrans value which can be explained with the strong gas maldistribution in the case of the bubble column operated with an air-water system.
Keywords: Bubble column, Flow Regime Identification, Entropy, Wire-Mesh Sensor, Computed Tomography
  • Poster
    Jahrestreffen der Fachgruppen Computational Fluid Dynamics und Mehrphasenströmungen, 19.-20.03.2015, Lüneburg, Deutschland

Publ.-Id: 21740 - Permalink

Performance of timing resistive plate chambers with relativistic neutrons from 300 to 1500MeV
Blanco, A.; Adamczewski-Musch, J.; Boretzky, K.; Cabanelas, P.; Cartegni, L.; Ferreira Marques, R.; Fonte, P.; Fruehauf, J.; Galaviz, D.; Heil, M.; Henriques, A.; Ickert, G.; Körper, D.; Lopes, L.; Palka, M.; Pereira, A.; Rossi, D.; Simon, H.; Teubig, P.; Traxler, M.; Velho, P.; Altstadt, S.; Atar, L.; Aumann, T.; Bemmerer, D.; Caesar, C.; Charpy, A.; Elekes, Z.; Fiori, E.; Gasparic, I.; Gerbig, J.; Göbel, K.; Heftrich, T.; Heine, M.; Heinz, A.; Holl, M.; Ignatov, A.; Isaak, J.; Johansson, H.; Kelic-Heil, A.; Lederer, C.; Lindberg, S.; Löher, B.; Machado, J.; Marganiec, J.; Martensson, M.; Nilsson, T.; Panin, V.; Paschalis, S.; Petri, M.; Plag, R.; Pohl, M.; Rastrepina, G.; Reifarth, R.; Reinhardt, T. P.; Röder, M.; Savran, D.; Scheit, H.; Schrock, P.; Silva, J.; Stach, D.; Strannerdahl, F.; Thies, R.; Wagner, A.; Weigand, F. W. M.;
A prototype composed of four resistive plate chamber layers has been exposed to quasi-monoenergetic neutrons produced from a deuteron beam of varying energy (300 to 1500 AMeV) in experiment S406 at GSI, Darmstad, Germany. Each layer, with an active area of about 2000 × 500 mm2, is made of modules containing the active gaps, all in multigap construction. Each gap is defined by 0.3 mm nylon mono-filaments positioned between 2.85 mm thick float glass electrodes. The modules are operated in avalanche mode with a non-flammable gas mixture composed of 90% C2H2F4 and 10% SF6. The signals are readout by a pick-up electrode formed by 15 copper strips (per layer), spaced at a pitch of 30 mm, connected at both sides to timing front end electronics. Measurements of the time of flight jitter of neutrons, in the mentioned energy range, point to a contribution of the resistive plate chamber in the order of 150 ps, independent of the neutron energy.
Keywords: Instrumentation and methods for time-of-flight (TOF) spectroscopy Resistive-plate chambers Particle detectors Neutron detectors (cold, thermal, fast neutrons)

Publ.-Id: 21738 - Permalink

Effect of deposition conditions and annealing temperature on tunnel magnetoresistance and structure of MgO-based double-barrier magnetic tunnel junctions
Feng, W.; Fowley, C.; Bernert, K.; Sluka, V.; Kowalska, E.; Aleksandrov, Y.; Lindner, J.; Fassbender, J.ORC; Gan, H.; Kunz, A.; Hübner, R.; Coey, J. M. D.; Deac, A. M.
Tunnel magnetoresistance was measured in CoFeB-MgO-based double-barrier magnetic tunnel junctions. Variation of the sputtering power density is used to control the relative B content of the middle electrode. Magnetoresistance ratios in both upper and lower junctions are suppressed with respect to the single-barrier case. While the lower junction shows a saturation of the magnetoresistance as a function of high temperature annealing for all sputtering power densities, the upper junction exhibits an increase in magnetoresistance as a function of annealing temperature with higher values for higher sputtering power density. The suppression of high magnetoresistance is attributed to a lack of strong crystallisation in the middle electrode, which is confirmed by cross-section transmission electron microscopy. Slight crystallisation of the middle electrode is achieved at the highest sputtering power density despite that fact that boron diffusion is suppressed due to the adjacent MgO tunnel barriers. Optimal deposition and post annealing conditions resulted in magnetoresistance values of 140 % and 80 % for the upper and lower junctions, respectively.
Keywords: boron diffusion, double-barrier magnetic tunnel junction, sputtering, tunnel magnetoresistance
  • IEEE Transactions on Magnetics 51(2015)11, 4400704
    DOI: 10.1109/TMAG.2015.2435260
  • Poster
    Intermag Conference 2015, 11.-15.05.2015, Beijing, China

Publ.-Id: 21737 - Permalink

Performance of timing Resistive Plate Chambers with protons from 200 to 800 MeV
Machado, J.; Adamczewski-Musch, J.; Blanco, A.; Boretzky, K.; Cabanelas, P.; Cartegni, L.; Ferreira Marques, R.; Fonte, P.; Fruehauf, J.; Galaviz, D.; Heil, M.; Henriques, A.; Ickert, G.; Körper, D.; Lopes, L.; Palka, M.; Pereira, A.; Rossi, D.; Simon, H.; Teubig, P.; Traxler, M.; Velho, P.; Altstadt, S.; Atar, L.; Aumann, T.; Bemmerer, D.; Caesar, C.; Charpy, A.; Elekes, Z.; Fiori, E.; Gasparic, I.; Gerbig, J.; Göbel, K.; Heftrich, T.; Heine, M.; Heinz, A.; Holl, M.; Ignatov, A.; Isaak, J.; Johansson, H.; Kelic-Heil, A.; Lederer, C.; Lindberg, S.; Löher, B.; Marganiec, J.; Martensson, M.; Nilsson, T.; Panin, V.; Paschalis, S.; Petri, M.; Plag, R.; Pohl, M.; Rastrepina, G.; Reifarth, R.; Reinhardt, T. P.; Röder, M.; Savran, D.; Scheit, H.; Schrock, P.; Silva, J.; Stach, D.; Strannerdahl, F.; Thies, R.; Wagner, A.; Wamers, F.; Weigand, M.;
A prototype composed of four resistive plate chamber layers has been exposed to quasi-monoenergetic protons produced from a deuteron beam of varying energy (200 to 800 AMeV) in experiment S406 at GSI, Darmstadt, Germany. The aim of the experiment is to characterize the response of the prototype to protons in this energy range, which deposit from 1.75 to 6 times more energy than minimum ionizing particles. Each layer, with an active area of about 2000 × 500 mm2, is made of modules containing the active gaps, all in multigap construction. Each gap is defined by 0.3 mm nylon mono-filaments positioned between 2.85 mm thick float glass electrodes. The modules are operated in avalanche mode with a non-flammable gas mixture composed of 90% C2H2F4 and 10% SF6. The signals are readout by a pick-up electrode formed by 15 copper strips (per layer), spaced at a pitch of 30 mm, connected at both sides to timing front end electronics. Results show an uniform efficiency close to 100% along with a timing resolution of around 60 ps on the entire 2000 × 500 mm2 area.

Publ.-Id: 21736 - Permalink

Development of selective ligands for f-elements separation
Ikeda-Ohno, A.;
In order to elucidate the separation mechanism of metals in chemical processes, understanding of the chemical species formed in the processes is fundamental particularly on a molecular level. Structural characterisation is of particular importance to understand the interaction between the metal of interest and separating reagents (i.e. ligands), which would be also beneficial to further improve the efficiency of separation processes and/or to develop new separation ligands. This talk will focus on the development of selective ligands for the separation of f-elements, as well as the coordination chemistry of f-elements with the developed ligands based on several X-ray spectroscopic techniques.
Keywords: f-elements, actinides, lanthanides, coordination chemistry, characterisation, separation
  • Invited lecture (Conferences)
    Microsymposium on Coordination Chemistry, 26.03.2015, TU Dresden, Dresden, Germany

Publ.-Id: 21735 - Permalink

The local environment of cobalt in amorphous, polycrystalline and epitaxial anatase TiO2:Co films produced by cobalt ion implantation
Yildirim, O.; Cornelius, S.; Smekhova, A.; Zykov, G.; Ganshina, E.; Granovsky, A.; Hübner, R.; Bähtz, C.; Potzger, K.;
Amorphous, polycrystalline anatase and epitaxial anatase TiO2 films have been implanted with 5 at. % Co+. The magnetic and structural properties of different microstructures of TiO2:Co, along with the local coordination of the implanted Co atoms within the host lattice are investigated. In amorphous TiO2:Co film, Co atoms are in the (II) oxidation state with a complex coordination and exhibit a paramagnetic response. However, for the TiO2:Co epitaxial and polycrystalline anatase films, Co atoms have a distorted octahedral (II) oxygen coordination assigned to a substitutional environment with traces of metallic Co clusters, which gives a rise to a superparamagnetic behavior. Despite the incorporation of the implanted atoms into the host lattice, high temperature ferromagnetism is absent in the films. On the other hand, it is found that the concentration and size of the implantation-induced nanoclusters and the magnetic properties of TiO2:Co films have a strong dependency on the initial microstructure of TiO2. Consequently, metallic nanocluster formation within ion implantation prepared transition metal doped TiO2 can be suppressed by tuning the film microstructure.
Keywords: Dilute magnetic oxides, nano-cluster, Co:TiO2, microstructure
  • Journal of Applied Physics 117(2015)18
    DOI: 10.1063/1.4919702
  • Poster
    DPG-Frühjahrstagung, 15.-20.03.2015, Berlin, Germany


Publ.-Id: 21734 - Permalink

Tuning the antiferromagnetic to ferromagnetic phase transition in FeRh thin films by means of low-energy/low fluence ion irradiation
Heidarian, A.; Bali, R.; Grenzer, J.; Wilhelm, R. A.; Heller, R.; Yildirim, O.; Lindner, J.; Potzger, K.;
Ion irradiation induced modifications of the thermomagnetic properties of equiatomic FeRh thin films have been investigated. The application of 20 keV Ne+ ions at different fluencies leads to broadening of the antiferromagnetic to ferromagnetic phase transition as well as a shift towards lower temperatures with increasing ion fluence. Moreover, the ferromagnetic background at low temperatures generated by the ion irradiation leads to pronounced saturation magnetization at 5 K. Complete erasure of the transition, i.e. ferromagnetic ordering through the whole temperature regime was achieved at a Ne+ fluence of 3E14 cm-2. It does not coincide with the complete randomization of the chemical ordering of the crystal lattice.
Keywords: Ion irradiation, FeRh

Publ.-Id: 21733 - Permalink

Visualization of steps and surface reconstructions in Helium Ion Microscopy with atomic precision
Hlawacek, G.; Jankovski, M.; Wormeester, H.; van Gastel, R.; Zandvliet, H. J. W.; Poelsema, B.;
Helium Ion Microscopy is known for its surface sensitivity and high lateral resolution. Here, we present results of a Helium Ion Microscopy based investigation of a surface confined alloy of Ag on Pt(111). Based on a change of the work function of 25 meV across the atomically flat terraces we can distinguish Pt rich from Pt poor areas and visualize the single atomic layer high steps between the terraces. Furthermore, dechanneling contrast has been utilized to measure the periodicity of the hcp/fcc pattern formed in the 2 ML thick Ag alloy layer. A periodicity of 6.65 nm along the $\langle\overline{11}2\rangle$ surface direction has been measured. In terms of crystallography a hcp domain is obtained through a lateral displacement of a part of the outermost layer by $1/\sqrt{3}$ of a nearest neighbour spacing along $\langle\overline{11}2\rangle$. The findings are perfectly in line with results obtained with Low Energy Electron Microscopy and Phase Contrast Atomic Force Microscopy.
Keywords: Helium Ion Microscopy, Channeling, Surface alloy, Step contrast, Low Energy Electron Microscopy


Publ.-Id: 21732 - Permalink

The development of the market for rare earth elements: insights from economic theory
Schlinkert, D.; van den Boogaart, K. G.;
In this paper, a clear and structured economic model is introduced to illustrate complex past and future developments of the market for rare earth elements (REE). The model consists of a sequence of four supply and demand models that give explanations how the mining and separation step of the REE value chain could concentrate in China. Furthermore, the sequence allows giving a coherent scenario for the future developments of the REE market. According to this scenario, the market could transform into an at least oligopoly due to a growing market demand. The validity of this scenario is discussed and evaluated from the perspective of western countries, investors and China. Additionally, a scenario, based on the models, of a propagating monopoly along the value chain will be discussed. Finally, suggestions are made for western governments to promote the transformation and lead it to a positive outcome.
Keywords: rare earth elements; economic model; monopoly; value chain

Publ.-Id: 21731 - Permalink

Crystalline nanostructures on Ge surfaces induced by ion irradiation
Ou, X.; Facsko, S.;
Besides conventional low efficiency lithographic techniques broad ion beam irradiation is a simple and potentially mass productive technique to fabricate nanoscale patterns on various semiconductor surfaces. The main drawback of this method is that the irradiated semiconductor surfaces are amorphized, which strongly limits the potential application of these nanostructures in electronic and optoelectronic devices. In this work we report that high-quality crystalline nanostructure patterns are formed on Ge surfaces via Ar+ irradiation at elevated temperatures.
This pattern formation process resembles the pattern formation in homoepitaxy. Therefore, the process is discussed based on a "reverse epitaxy" mechanism.
Keywords: ion induced patterning, nanostructures, reverse epitaxy

Publ.-Id: 21730 - Permalink

Influence of a halophilic archaeum to uranium migration under highly saline conditions
Bader, M.; Drobot, B.; Müller, K.; Stumpf, T.; Cherkouk, A.;
In Germany salt rock and clay are considered as potential host rock for the final repository of radioactive waste in deep geological formations. Both possibilities have in common that high saline conditions can occur. In clay deposits of Northern Germany pore water salt concentrations of 4.3 M were measured [1] and in salt rock the salt concentration is up to saturation. Despite these extreme environments some microbes are able to survive. To date little is known about the interactions of halophilic microorganisms with actinides and hence to the migration behavior. But for the safety assessment of the final repository it is important to know the impact of indigenous microorganisms. Microbes can interact with actinides in different ways [2]. Within this study, the sorption of uranium on the cell surface (so called biosorption) of Halobacterium noricense DSM 15987 cells was studied. This halophilic archaeum was chosen due to its worldwide occurrence in salt rock [3]. The reference strain was isolated in an Austrian salt mine [4] and similar species occurred also in the Waste Isolation Pilot Plant (WIPP, Carlsbad, New Mexico, USA) [3].
Biosorption studies were undertaken at pH 6.0 and a NaCl concentration of 3.0 M in dependence of uranium concentration, time and temperature. The uranium content in the supernatant after sorption was measured with ICP-MS (Inductively Coupled Plasma Mass Spectrometry). Both, supernatant and cell pellet, were analyzed with TRLFS (Time-resolved Laser-induced Fluorescence Spectroscopy) to get information about the formed complexes. Furthermore the cells were analyzed with Infrared Spectroscopy.
The results demonstrated that independent of the uranium concentration (10 – 120 µM) around 90 % of the added uranium was sorbed by the cells at room temperature. A time-dependent sorption study showed that this maximal sorption was reached after an incubation time of 42 h. A slightly faster sorption of added uranium could be seen at higher temperatures. Particularly at 50 °C, the maximal sorption was already reached after 24 h. In general, the obtained sorption curve indicated a two-step binding process of added uranium with a fast step within the first hours and a second slower one. For a uranium concentration of 100 µM the metal sorption rate of 37.5 ± 0.7 mg U(VI) per 1 g dry biomass of Halobacterium noricense DSM 15987 was determined .
Interestingly, with increasing time, uranium concentration and temperature the cells began to form agglomerates. Live/Dead staining (LIVE/DEAD® Bac LightTM Bacterial Viability Kit L7012, Molecular Probes) of cells after the biosorption with uranium showed that nearly all single cells were dead whereas agglomerated cells were alive. One conclusion is that this process is a kind of stress response to protect the cells themselves from environmental challenges.
The characterization of the formed cell-uranium-complexes with TRLFS indicated that uranium was bound to cellular carboxylic groups. This can be seen by comparing with literature spectra [5]. The obtained lifetimes of the uranyl complexes differed from those due to the quenching effect of the high chloride concentration to uranium luminescence. The binding of uranium to the carboxylic groups of the cell could be also verified with Infrared Spectroscopy.

[1] J. Larue, VerSi Endlagerung im Tonstein, Abschlussbericht 3607R02538 (2010).
[2] K. Morris, et al., Interactions of microorganisms with radionuclides 2, 101 (2002).
[3] J. S. Swanson, et al., Status report Los Alamos National Laboratory (2012).
[4] C. Gruber, et al., Extremophiles 8, 431 (2004).
[5] M. Vogel, et al., Sci. Total Environ. 409, 384 (2010).
  • Poster
    15th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 13.-18.09.2015, Santa Fe, USA

Publ.-Id: 21729 - Permalink

Terahertz-driven ultrafast magnetization dynamics in canted antiferromagnetic YFeO3
Lee, J. S.; Kim, T.; Kovalev, S.; Tokunaga, Y.; Tokura, Y.; Gensch, M.;
We investigate the coherent precessional motion of the magnetic moment in the canted antiferromagnetic YFeO3 single crystal after excitation by the transient magnetic field of an ultra-short THz pulse. Time-resolved measurements of the magneto-optical response in the presence of external magnetic fields confirm the exclusive magnetic origin of the interaction between THz pulse and the spin system.. By tuning the spectral component of the input THz pulse around the quasi-ferromagnetic mode located near 0.3 THz, we have experimentally verified that the THz control of the spin state requires resonant excitation. We could confirm these results from the simulation based on the Landau-Lifshitz-Gilbert equation with two sub-lattice model for the canted antiferromagnet. Furthermore, we demonstrate that the spin state can be switched all-optically on a picosecond timescale using THz pulses of square and oscillating shapes. Whereas the oscillating THz pulse with a spectral component resonant with the magnetic excitations is necessary for an efficient magnetization switching, we study the possibility for a further reduction of the necessary THz field strength by examining influences of variations in the anisotropy energy and Dzyaloshinskii-Moriya interaction upon the switching behaviors.
Keywords: High-field THz, magnetization Dynamics, spin Dynamics, THz control, ultra-fast
  • Lecture (Conference)
    20th International Conference on Magnetism - ICM2015, 05.-10.07.2015, Barcelona, Spain

Publ.-Id: 21728 - Permalink

Modelling of Free Surface Flow Within the Two-Fluid Euler-Euler Framework
Porombka, P.;
Two-phase flows are regularly involved in the heat and mass transfer of industrial processes. To ensure the safety and efficiency of such processes, accurate predictions of the flow field and phase distribution by means of Computational Fluid Dynamics (CFD) are required. Direct Numerical Simulations (DNS) of large-scale two-phase flow problems are not feasible due to the computational costs involved. Therefore the Euler-Euler framework is often employed for large-scale simulations which involves macro-scale modelling of the turbulent shear stress and the interphase momentum transfer.
As a long term objective, the research activities at Helmholtz-Zentrum Dresden - Rossendorf (HZDR) pursue the development of general models for two-phase flows which are based on first principles and include less empiricism. Part of this effort is focused on the development of an algebraic interfacial area density model (AIAD) [1,2] which enables the simulation of two-phase flows with general morphologies including bubble, droplet and stratified flow regimes with the two-fluid approach.
In this work a short overview of the AIAD model is given and recent developments are presented.
The modelling of the interfacial drag in free surface flows is of particular interest and subject to ongoing research. Apart from empirical correlations which are limited to certain flow regimes, different models have been developed for the local computation of the interfacial drag coefficient [3,4]. In the AIAD model the drag model given by Höhne et al. [3] is used. It has recently been subject to modifications which are presented and validated as a part of this study.
Furthermore, special attention is paid to the turbulence treatment at the phase boundary of free surface flows. A model for the damping effect on the turbulent fluctuations in the near interface region as proposed in [1] is validated in this work.
Model validation is performed by means of simulations of horizontal stratified two-phase flow with the Euler-Euler two-fluid approach and the results are compared to experimental data given by Stäbler [5].
  • Contribution to proceedings
    Joint Fluids Engineering Conference 2015, 26.-31.07.2015, Seoul, Korea
    Proceedings of the Joint Fluids Engineering Conference 2015

Publ.-Id: 21727 - Permalink

Tomography of the ionosphere with geostatistical inversion
Minkwitz, D.; van den Boogaart, K. G.; Hoque, M.; Gerzen, T.;
The ionosphere is the upper part of the atmosphere where sufficient free electrons exist to affect the propagation of radio waves. Typically, the ionosphere extends from about 50 -1000 km and its morphology is mainly driven by solar radiation, particle precipitation and charge exchange. In the last decade Global Navigation Satellite Systems (GNSS, e.g. GPS and GLONASS) measurements have become one of the major tools for ionospheric sounding enabling the derivation of the total electron content (TEC) along a satellite to receiver ray path.

Our interest is the reconstruction of the ionosphere's electron density in order to mitigate the ionospheric delay in applications such as GNSS positioning and satellite-based radar imaging. Following the ionosphere's behaviour we establish a non-stationary spatial covariance model of the electron density, where its parameters are estimated in a maximum likelihood approach. Henceforth the integral GNSS TEC measurements and a non-stationary trend model are incorporated. Based on the derived spatial covariance the electron density is estimated by kriging with linear functionals.
Keywords: Bayes inversion, geostatistics of linear functionals
  • Lecture (Conference)
    IAMG 2015 The 17th annual conference of the International Association for Mathematical Geosciences, 05.-13.09.2015, Freiberg, Deutschland
  • Contribution to proceedings
    IAMG 2015 - The 17th annual conference of the International Association for Mathematical Geosciences, 05.-13.09.2015, Freiberg, Deutschland
    Proceedings of IAMG 2015, Freiberg: IAMG office, 978-3-00-050337-5

Publ.-Id: 21726 - Permalink

The Effect of Problem Formulation on Adaptive Processing Decisions
van den Boogaart, K. G.; Tolosana Delgado, R.; Matos Camacho, S.;
Geometallurgy is concerned with optimal mining and processing decisions based on a quantitative modeling of the ore micro fabric and the processes. The optimal choice is then inferred from a geostatistical model and a processing model (), typically by applying an optimization algorithm to select the best processing within a model formulation. The aim of our contribution is to discuss and show the effect of the problem formulation and on the performance of the optimal solution.

This analysis contains the effect limit input (e.g. grade vs. microfabric, joint distributions vs. correlation, ...), the scope of the decision (e.g. processing path, processing parameters, block decisions vs. shape decisions, decisions on sampling, blending, invest into capacity, sequencing) and of model accuracy (e.g. concerning unmodelled details).

The effects will be demonstrated with simulation examples in perfectly controlled stochastic settings. It can be shown, that problem formulation can have a major impact on the economic result, and that the effect of problem formulation depends on the actual setting.
Keywords: geometallurgy, geostatistics, decission theory
  • Lecture (Conference)
    IAMG 2015, The 17th annual conference of the International Association for Mathematical Geosciences, 05.-13.09.2015, Freiberg, Deutschland
  • Contribution to proceedings
    IAMG 2015, The 17th annual conference of the International Association for Mathematical Geosciences, 05.-13.09.2015, Freiberg, Deutschland
    Proceedings of IAMG 2015, Freiberg: IAMG office, 978-3-00-050337-5, 217-226

Publ.-Id: 21725 - Permalink

Influence of carbonate solubilisation on copper leaching from Kupferschiefer with organic acids
Kostudis, S.; Bachmann, K.; Kutschke, S.; Pollmann, K.; Gutzmer, J.;
European Kupferschiefer deposits are one of the most important regional copper sources. Its complex structure and fine granularity demand smelting processes which require much energy and release environmentally unfriendly gases like sulphur dioxide. Thus alternative beneficiation strategies like biomining are worthwhile. Furthermore the Kupferschiefer challenges common acidophilic bioleaching approaches due to its high carbonate load consuming acid during decomposition. Therefore leaching in neutral pH ranges seems attractive. However, as decomposition of carbonates may also expose further copper minerals we investigated the influence of carbonate solubilisation on the leaching performance of organic acids. Leaching of copper from Kupferschiefer using biologically produced organic acids was proven to be feasible. Different parameters like pH, particle size and leaching temperature were evaluated. Copper solubilisation was monitored using mass spectrometry and scanning electron microscopy. The paper presents results and provides leaching strategies.
  • Contribution to proceedings
    21st International Biohydrometallurgy Symposium 2015, 05.-08.10.2015, Sanur, Bali, Indonesia
    Proceedings of the 21st International Biohydrometallurgy Symposium 2015
  • Advanced Materials Research 1130(2015), 278-281
    DOI: 10.4028/

Publ.-Id: 21724 - Permalink

Microbial diversity studies of Spanish bentonites: Comparison of clone libraries and Illumina-sequencing based methods
Merroun, M. L.; López-Fernández, M.; Sánchez-Castro, I.; Vargas-Vílchez, R.; Cherkouk, A.;
The long-term disposal of radioactive wastes in a deep geological repository (DGR) is the accepted international solution for the treatment and management of these special residues, mainly produced by the nuclear energy industry. The present work describes the structure and composition of microbial communities in Spanish bentonites, considered as natural analogue of the bentonite-engineered barrier, by two different culture- independent approaches based on the 16S ribosomal RNA gene analysis: clone libraries and Illumina sequencing platform. These two techniques showed a high microbial diversity of the bentonite samples studied. The microbial community was dominated by Proteobacteria and Bacteroidetes, and contained bacteria potentially involved in the possible microbial deterioration processes of DGR safety case including transformations of clay minerals, mobilization/immobilization of radionuclides, etc. When analysing all of the datasets from the samples en masse we observed high similarity between the clone libraries and Illumina datasets in terms of dominant groups and the community profiles at the phylum level, while significant differences in the proportion of some phyla and class between the samples were observed. Illumina-sequencing was more sensitive to Bacteroidetes, while in the case of Gammaproteobacteria class, the traditional clone library was much more efficient. The structure and composition of the microbial communities present in the bentonites samples will be discussed in term of geochemistry and mineralogy of the clays, and also on their impact in the safety case of DGR. The results obtained indicate that the combination of both molecular techniques provide an accurate and boarder view of the microbial communities present in complex environmental samples.
  • Poster
    Clays in natural and engineered barriers for radioactive waste confinement, 23.-26.03.2015, Bruessels, Belgium

Publ.-Id: 21723 - Permalink

In situ spectroscopic identification of neptunium(V) inner-sphere complexes on the hematite-water interface
Müller, K.; Gröschel, A.; Rossberg, A.; Bok, F.; Franzen, C.; Brendler, V.; Foerstendorf, H.;
Hematite plays a decisive role in regulating the mobility of contaminants in rocks and soils. The Np(V) reactions at the hematite−water interface were comprehensively investigated by a combined approach of in situ vibrational spectroscopy, X-ray absorption spectroscopy and surface complexation modeling. A variety of sorption parameters such as Np(V) concentration, pH, ionic strength, and the presence of bicarbonate was considered. Time-resolved IR spectroscopic sorption experiments at the iron oxide−water interface evidenced the formation of a single monomer Np(V) inner-sphere sorption complex. EXAFS provided complementary information on bidentate edge-sharing coordination. In the presence of atmospherically derived bicarbonate the formation of the bis-carbonato inner-sphere complex was confirmed supporting previous EXAFS findings.1 The obtained molecular structure allows more reliable surface complexation modeling of recent and future macroscopic data. Such confident modeling is mandatory for evaluating water contamination and for predicting the fate and migration of radioactive contaminants in the subsurface environment as it might occur in the vicinity of a radioactive waste repository or a reprocessing plant.
Keywords: iron oxides, Fe2O3, neptunyl, actinides, ATR FT-IR spectroscopy, x-ray absorption, EXAFS, surface complexation

Publ.-Id: 21722 - Permalink

Numerical simulations of a precession driven flow in a cylinder.
Giesecke, A.; Gundrum, T.; Herault, J.; Stefani, F.;
Precession has long been discussed as a complementary energy source for driving the geodynamo. A fluid flow of liquid sodium in a cylindrical container, solely driven by precession, is considered as a source for magnetic field generation in the next generation dynamo experiment currently under development in the framework of DRESDYN (DREsden Sodium facility for DYNamo and thermohydraulic studies).
We present results from three-dimensional non-linear hydrodynamic simulations of a precession driven flow in cylindrical geometry. The main focus will be on non-axisymmetric time-dependent flow structures that could be responsible for dynamo action. Promising candidates may be triadic resonances that are caused by non-linear interaction of three distinct inertial modes. These modes have a comparable structure as the columnar convection cells that are responsible for dynamo action in geodynamo simulations, and it seems reasonable to expect similar properties in case of precessional forcing.
Our simulations reveal clear triads at aspect ratios close to predictions from the linear theory. However, the emergence of these structures requires a remarkable long time-span of the order of a few hundred rotation periods till a (quasi-)steady state is reached. Furthermore, the amplitude of the waves with higher azimuthal wavenumbers remains well below the forced m=1 mode. Their ability for dynamo action will have to be verified in future simulations of the magnetic induction equation.
Keywords: DRESDYN Dynamo Precession flow
  • Lecture (Conference)
    EGU General Assembly 2015, 13.-17.04.2015, Wien, Oesterreich
  • Open Access LogoAbstract in refereed journal
    Geophysical Research Abstracts 17(2015), EGU2015-5714

Publ.-Id: 21721 - Permalink

Advanced identification and discrimination of Indium-bearing minerals by automated mineralogy
Bachmann, K.; Frenzel, M.; Gutzmer, J.;
Studies of the mineralogical deportment of indium generally focus on the measurement of trace concentrations in major ore minerals. The importance of actual In-minerals such as indite, roquesite and sakuraiite is not usually assessed. This is due to their low abundance and optical similarity to other, more common, sulphide minerals (e.g. sphalerite) rendering the reliable assessment of their concentration by traditional methods (point-counting) difficult at best. Their low abundance also means that reference materials for many of the relevant minerals are not readily available.
This contribution presents a general method developed to overcome these problems with SEM-based automated mineralogy. Using five carefully selected ore samples from the Neves-Corvo deposit it is shown that this approach not only allows for the reliable identification of trace indium minerals (roquesite) present within the ores, but it also enables the quantification of their respective concentrations and thus their contribution to the overall indium budget. Furthermore, additional information on other geologically and/or technologically relevant parameters like mineral association, grain shape and grain size are readily available.
Keywords: MLA; Neves Corvo; Indium; roquesite; automated mineralogy
  • Poster
    13th SGA Biennal Meeting, 24.-27.08.2015, Nancy, France

Publ.-Id: 21720 - Permalink

Hydrodynamics analysis in micro-channels of a viscous coupling using gamma-ray computed tomography
Bieberle, A.; Schlottke, J.; Spies, A.; Schultheiss, G.; Banzhaf, M.; Kuehnel, W.; Hampel, U.;
In this work, high-resolution gamma-ray computed tomography (HireCT) was applied for the first time on a viscous coupling to visualize the internal operating fluid distribution. The HireCT measurement system comprises a 137Cs isotopic source and a gamma-ray detector arc operated in single photon counting mode and is able to produce cross-sectional images of dense objects with a spatial resolution of about 2 mm. To scan fast rotating parts rotation-synchronized CT scanning mode was employed in these experiments. The analyzed viscous coupling (Visco® clutch of MAHLE Behr) mainly consists of a driven primary disc and a secondary housing with an engine cooling fan mounted on it and is assembled within an experimental rig. The viscous coupling’s primary and secondary parts are axially assembled and a coupling liquid is pumped into engaged radial ring profiles to provide a defined torque transfer. The internal ring channel width, where the coupling liquid is to be observed, is considerably lower than one millimeter. Although the HireCT measurement system is not able to resolve these micro-channels, the coupling liquid can be successfully visualized via its contrast. Investigations have been performed at different filling levels corresponding to different transmission slips of the test coupling. Moreover, both radial and tangential liquid distributions for different operational steady states could be determined. The obtained experimental data were compared to results from computational fluid dynamics (CFD) simulations in some operating points and are in good agreement.
Keywords: viscous coupling, gamma-ray computed tomography, design optimization, CFD

Publ.-Id: 21719 - Permalink

A new methodology for utilizing multidimensional smart Kd-matrices in transport programs for long-term safety assessment
Stockmann, M.; Brendler, V.; Schikora, J.; Flügge, J.; Noseck, U.;
Sorption on mineral surfaces is one important retardation process to be considered in long-term safety assessments for radioactive waste repositories. So far a conservative concept with temporally and spatially constant distribution coefficients (Kd values) for each model unit is applied in the respective transport simulations.
In this work we describe a new methodology for integrating temporally and spatially variable distribution coefficients, so-called smart Kd values, into the transport code r³t [1]. These smart Kd values are pre-calculated with a bottom-up approach from mechanistic sorption models (namely surface complexation and ion exchange) and stored in a multidimensional matrix by coupling of three computer codes: PHREEQC [2], UCODE [3] and SimLab [4]. This strategy has numerous advantages over reactive transport codes: (1) One can calculate smart Kd values for a reasonable number of environmental parameter combinations; (2) It is possible to perform uncertainty analysis based on such smart Kd matrices; (3) In contrast to UCODE, SimLab also provides methods for global sensitivity analysis; (4) The overall methodology is much more efficient in computing time than a direct coupling of the geochemical speciation code with the transport code r3t.
The capability of this new methodology is demonstrated exemplarily for the sorption of uranium UVI on a natural sandy aquifer [5] and is able to describe the sorption behavior in dependence of changing geochemical conditions quite well. Complex proof-of-concept scenarios were simulated for the sedimentary overburden of the Gorleben salt formation. Here, results for the upper aquifer are presented and discussed. As a prerequisite, the data processing of the field data [6, 7] is explained, including approximate correlations of environmental input parameters. Eventually, five environmental factors span the multidimensional parameter space for the Kd matrices.
Smart Kd distributions based on Latin-Hypercube samplings are given for different radionuclides covering the elements Am, Cs, Ni, NpV, Ra, SeVI, Th and UVI; with Am and Th also used as chemical analogues for Cm and Pu, respectively. They are then compared to constant values, determined in laboratory experiments [8], which have been used so far in transport calculations for long-term safety assessment. In a last step, ranked sensitivity indices are provided for all the investigated radionuclides to identify the most relevant environmental factors, which should be investigated in more detail in the future to improve both the data base and process understanding.
  • Lecture (Conference)
    MIGRATION 2015, 13.-18.09.2015, Santa Fe, NM, USA

Publ.-Id: 21718 - Permalink

Pygmy resonances and radiative nucleon captures for stellar nucleosynthesis
Tsoneva, N.; Goriely, S.; Lenske, H.; Schwengner, R.;
The impact of low-energy multipole excitations and pygmy resonances on radiative neutron and proton capture cross sections in nuclei close to the -stability line is investigated. For this purpose, a microscopic theoretical approach based on self-consistent density functional theory and QRPA formalism extended with multi-phonon degrees of freedom, is implemented in a statistical reaction model. The advantage of the method is the fully microscopic nuclear structure input for unified description of low-energy multi-phonon excitations, pygmy and giant resonances. This is found important for the understanding of the fine structure and dynamics of nuclear response functions at low energies which strongly influence nuclear reaction rates of astrophysical significance. Calculations of the radiative capture cross sections of the reactions 85Kr(n,)86Kr, 87Sr(n,)88Sr and 89Y(p,)90Zr are discussed in comparison with the experiment. For the reactions 89Zr(n,)90Zr and 91Mo(n,)92Mo theoretical predictions of the reaction cross sections are made.
Keywords: Photonuclear reactions, radiative capture reactions, stellar nucleosynthesis, quasiparticle-phonon model.

Publ.-Id: 21716 - Permalink

Tregs activated by bispecific antibodies: Killers or suppressors?
Koristka, S.; Cartellieri, M.; Arndt, C.; Feldmann, A.; Seliger, B.; Ehninger, G.; Bachmann, M. P.;
In recent years, bispecific antibodies (bsAb) have emerged as promising tools for a target-specific redirection of T cells in order to eliminate malignant cells. However, CD3-engaging constructs might also activate T regulatory cells (Tregs) present in the tumor microenvironment. Whether this has detrimental or beneficial effects for tumor therapy is still controversially discussed.
Keywords: cytotoxicity, immunotherapy, immunsuppression, single-chain bispecific antibodies, T cell retargeting, T regulatory cells

Publ.-Id: 21715 - Permalink

Response of geological resident microbial communities to additions of nitrates and/or acetate, mimicking leachates of bituminized intermediate-level radioactive waste
Moors, H.; Mysara, M.; Cherkouk, A.; Bleyen, N.; Smets, S.; Schwyn, B.; Achim, A.; Wittebroodt, C.; Small, J.; de Cannière, P.; Stroes-Gascoyne, S.; Valcke, E.; Leys, N.;
Clay deposits such as the Opalinus Clay formation are studied as host rocks for geological disposal of high- and intermediate-level long-lived radioactive waste in several European countries. Bituminized intermediate-level long-lived radioactive waste contains, besides bitumen and radionuclides, also large amounts of organics, nitrates and sulphates. Over time, these salts will dissolve, leach and diffuse into the surrounding clay host rock, together with water soluble organic substances. To mimic the potential effect of such inorganic– and organic leachates, pulses of nitrate and/or acetate have been injected in intervals of an in situ experiment, called Bitumen-Nitrate-Clay interaction (BN) experiment, running at the Mont Terri geological laboratory (St. Ursanne, Switzerland).
To elucidate whether the microbial communities, present in the BN experiment, are affected or involved in the observed biogeochemical changes.
Beside classical microbial analyses, at pivotal moments (i.e. before, during and after these pulse injection tests), priority was given to DNA-based molecular biology analysis methods, as these methods provide very accurate information on the composition, the metabolic capacity and possible evolution of bacterial communities in response to the nitrate and/or acetate injections.
The changes observed in the bacterial populations appeared to correlate well with the imposed physico-chemical changes. As soon as nitrate was added an overwhelming community shift appeared to nitrate reducing bacteria. If in parallel acetate was offered, the community composition did not alter that much, but the speed of nitrate reduction was increased twentyfold. This high nitrate removal speed was maintained as long as the easily consumable carbon source was abundant.
  • Poster
    FEMS - 6th Congress of European Microbiologists, 07.-11.06.2015, Masstrich, The Netherlands

Publ.-Id: 21714 - Permalink

The Bitumen-Nitrate-Clay Interaction Experiment at the Mont Terri Rock Laboratory, Switzerland: Response of Microbial Communities to Additions of Nitrate and Acetate
Moors, H.; Cherkouk, A.; Mysara, M.; Bleyen, N.; Smets, S.; Schwyn, B.; Albrecht, A.; Wittebroodt, C.; Small, J.; de Cannière, P.; Stroes-Gascoyne, S.; Valcke, E.; Leys, N.;
Clay deposits such as the Opalinus Clay formation are studied as host rocks for geological disposal of high- and intermediate-level long-lived radioactive waste in several European countries. Bituminized intermediate-level long-lived radioactive waste contains, besides bitumen and radionuclides, also large amounts of nitrates and sulphates. Over time, these salts will dissolve, leach and diffuse into the surrounding clay host rock, together with water soluble organic substances. The presence of these compounds will induce several processes (e.g. ionic strength changes, ion exchange reactions with Na+, redox reactions with NO3-) that may affect the barrier properties of the clay host rock.
To study the fate of such inorganic– and organic leachates, an in situ experiment, called Bitumen-Nitrate-Clay interaction (BN) experiment, was installed in the Opalinus Clay at the Mont Terri underground research laboratory (St. Ursanne, Switzerland). The BN experiment aims to investigate the impact of a nitrate plume, with or without acetate, on the biogeochemistry of the near-field host rock. Acetate is used as representative of the organic water soluble fraction of bitumen degradation products. At a later stage, the BN experiment also aims to investigate the impact of nitrate and acetate on radionuclide reactivity and transport, especially for the redox sensitive radionuclides (e.g. 79Se, 99Tc, 23xU, …). The microbial analyses of the BN experiment intend to elucidate if and how currently present microbial communities are affected, and if and how microbes are involved in the observed biogeochemical processes. In this respect it is noteworthy to mention that the current BN set-up does not take into account any cement matrix or backfill, and offers the microbes only a pure aquatic environment, at almost neutral pH, in the form of a water-filled borehole. Such set-up allows free movement of nutrients, energy sources and dissolved electron donors and – acceptors, and does not impose any physical and/or chemical restriction on the microorganisms. In a real radioactive waste repository, the conditions will mostly deviate from the ones present in the BN experiment. Therefore, the in situ BN experiment can only be considered as a well engineered disposal 'test case'...
  • Lecture (Conference)
    Clays in natural and engineered barriers for radioactive waste confinement, 23.-26.03.2015, Bruessels, Belgium

Publ.-Id: 21713 - Permalink

Application of HERFD and in-situ XAS to study oxide nuclear fuel and fission product behavior
Martin, P. M.; Bes, R.; Prieur, D.; Vathonne, E.; Carlot, G.; Delorme, R.; Sabathier, C.; Freyss, M.; Garcia, P.; Bertolus, M.; Lebreton, F.; Caisso, M.; Delahaye, T.; Strach, M.; Belin, R.; Martel, L.; Vigier, J.-F.; Somers, J.; Prussmanns, T.; Vitova, T.; Rothe, J.; Dardenne, K.; Solari, P.-L.; Kvashnina, K.; Glatzel, P.; Scheinost, A. C.; Proux, O.;
Over the last decades, XAS has evolved as a very useful tool to investigate nuclear materials with applications for fuel manufacturing of for the behavior for fission products. Nowadays, the possibility of applying HERFD measurements to radioactive compounds offers even more possibilities. Two recent studies dealing with the behavior of fission gases in UO2 nuclear fuel and investigating both the electronic and structural properties of uranium based mixed oxide fuels will be presented to illustrate the use of HERFD. Furthermore, recent experimental developments allowing to perform in-situ XAS measurements on actinide-based materials at high temperature and under controlled atmosphere, will be illustrated by the first results obtained on UO2±x and (U,La)O2±x samples.
Keywords: 4th generation nuclear fuels, transmutation
  • Lecture (Conference)
    16th International Conference on X-ray Absorption Fine Structure - XAFS16, 23.-28.08.2015, Karlsruhe, Germany

Publ.-Id: 21712 - Permalink

Electronic and structural changes induced by the incorporation of aliovalent cation in UO2
Prieur, D.; Martin, P.; Bes, R.; Lebreton, F.; Caisso, M.; Delahaye, T.; Strach, M.; Belin, R.; Martel, L.; Vigier, J.-F.; Prussmann, T.; Vitova, T.; Solari, P.; Kvashnina, K.; Scheinost, A. C.; Somers, J.;
The incorporation of aliovalent cations into the UO2 structure leads to a change of the U oxidation state and can ultimately affects the physical propertiesy of these U1-yMyO2±x compounds. U1-yLayO2±x, U1-yPuyO2±x and U1-yAmyO2±xhave been investigated in the present work, as these materials are particularly relevant for the nuclear fuel cycle. LIII XANES, LIII HERFD-XANES and MIV HERFD-XANES measurements have been performed to study both electronic and structural environments of these fluorite-type solid solutions.
Keywords: 4th generation nuclear fuel, transmutation, ROBL
  • Lecture (Conference)
    XAFS16 - 16th International Conference on X-ray Absorption Fine Structure, 23.-28.08.2015, Karlsruhe, Germany

Publ.-Id: 21711 - Permalink

Topological spin textures as emitters for multidimensional spin wave modes

Sluka, V.; Weigand, M.; Kakay, A.; Erbe, A.; Tyberkevych, V.; Slavin, A.; Deac, A.; Lindner, J.; Fassbender, J.ORC; Raabe, J.; Wintz, S.
In the present contribution we will show that in a stacked vortex pair system with uniaxial magnetic anisotropy, spin waves of different symmetries and dimensionalities can be excited.
Keywords: vortex spin-wave
  • Lecture (Conference)
    20th International Conference on Magnetism, 05.-10.07.2015, Barcelona, Spanien

Publ.-Id: 21710 - Permalink

Electromagnetic Dipole Strength in 124,128,134Xe
Massarczyk, R.; Schwengner, R.; Junghans, A. R.;
The electromagnetic dipole strength in several even nuclei in the chain of Xenon isotopes has been investigated at the bremsstrahlung facility of the ELBE accelerator in Dresden, Germany and at the HIγS facility in Durham, USA. The goal of these measurements is to extend the knowledge about the general behavior of the dipole strength in the energy region below the neutron separation energy under the aspect of neutron excess and nuclear deformation.

Publ.-Id: 21709 - Permalink

Staining on heritage building stone identified by NMR spectroscopy
Franzen, C.; Kretzschmar, J.; Franzen, C.; Weiss, S.;
Brown staining on both pristine and painted sandstone surfaces is a regular problem reported from new building construction and restoration actions. During the recent restoration of the Großer Wendelstein, an impressive airy stone staircase in the castle Hartenfels in Torgau, Germany, extensive brown staining appeared in distinctive places. Due to the fact that such an incidence occurred while desalination with poultice compresses the usually extreme rare chance of sampling was possible and executed. Several chemical tests combined with Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy proved humic substances as causation of the intensive staining. In the consequence restorative recommendations are drawn.
Keywords: NMR, IR-spectroscopy, staining, stone restoration, humic fulvic acid

Publ.-Id: 21708 - Permalink

Uptake of Selenium by delta-alumina at elevated temperatures
Franzen, C.; Bok, F.; Jordan, N.;
The temperature impact on sorption processes of selenium oxyanions onto alumina was investigated.
Keywords: sorption oxyanions selenate selenite
  • Poster
    HiTAC-II Workshop; High Temperature Aqueous Chemistry, 16.04.2015, Heidelberg, Deutschland

Publ.-Id: 21706 - Permalink

Noise reduction of ultrasonic Doppler velocimetry in liquid metal experiments with high magnetic fields
Seilmayer, M.; Stefani, F.; Gundrum, T.;
The last decades have seen a number of liquid metal experiments on the interaction of magnetic fields with the flow of electrically conducting fluids. The opaqueness of liquid metals requires non-optical methods for inferring the velocity structure of the flow. Quite often, such experiments are carried out in the presence of high electrical currents to generate the necessary magnetic fields. Depending on the specific purpose, these currents can reach several kiloamperes. The utilized switching mode power supply can then influence seriously the measurement system by electromagnetic interference. A recent experiment on the azimuthal magnetorotational instability (AMRI) has shown that a hydrodynamically stable Taylor-Couette flow becomes unstable under the influence of a high azimuthal magnetic field. Therefor an electrical current along the axis of the experiment with up to 20 kA generates the necessary field to destabilize the flow. We present experimental results on this AMRI experiment carried out at the PROMISE facility with an enhanced power supply. For this setup, we discuss the elaborate measures that were needed to obtain a reasonable signal-to-noise ratio of the ultrasonic Doppler velocimetrie (UDV) system. In dependence on various parameter variations, some typical features of the observed instability, such as the energy content, the wavelength, and the frequency are analyzed and compared with theoretical predictions.
Keywords: Taylor-Couette flow; magnetorotational instability; noise reduction; Ultrasonic Doppler velocimetry; electromagnetic interference

Publ.-Id: 21705 - Permalink

Validation and verification of the coupled neutron kinetic/thermalhydraulic system code DYN3D/ATHLET
Kozmenkov, Y.; Kliem, S.; Rohde, U.;
One of the most intensively developing areas in the LWR multi-physics is a coupling of different best estimate 3-D neutron kinetic (BIPR, DYN3D, KIKO3D, NEM, PARCS, etc.) and thermal hydraulic (ATHLET, CATHARE, RELAP5, etc.) codes. Resulting coupled code systems have advanced capabilities of modeling both steady-state spatial distributions of the core power and their evolutions during different kinds of reactor transients. They are also highly useful in the analyses of possible reactor instabilities. Initial steady-state core power distributions can be disturbed by changes in the reactor loop mass flow rates and/or temperatures, by relocations of the low-temperature/diluted-boron water slugs within the primary system or by movements of control rods.
The coupled code used for LWR simulations in HZDR is DYN3D/ATHLET, which includes the 3-D core neutron kinetic and thermal hydraulic model of own development – DYN3D. The paper reports major capabilities of DYN3D as well as different ways of its coupling with the thermal hydraulic code ATHLET (external, internal and parallel), but mainly focuses on the validation and verification of the coupled code DYN3D/ATHLET. In the course of DYN3D/ATHLET validation/verification nearly 20 real plant transients and dynamic benchmarks have been simulated and analysed. The LWR types covered by these tasks are: VVER-440 (Bohunice-3, Greifswald-5 and Loviisa-1 units), VVER-1000 (Balakovo-1, Balakovo-4, Kalinin-3, Kozloduy-6, Saporozhye-6 and Temelin-2 units), B&W PWR (TMI-1) and BWR/4 MK-1 (Peach Bottom-2). For each reactor unit a computational model was developed according with the benchmark specifications. The simulated tasks describe different scenarios of increasing complexity, including the transients initiated by the main steam header or main steam line breaks, switching off/on of main circulation pumps, turbine trip and generator load drop. Some of the transients are characterized by a strongly asymmetric behavior of the primary system (e.g. caused by a steam line break), and the processes of coolant mixing in the lower and upper reactor plenums as well as in the downcomer are important for these cases. The coupled code DYN3D/ATHLET models the primary coolant mixing in two ways – whether by an appropriate nodalization of the mixing area or by using two specific models for mixing in the lower plenum. The first of the lower plenum mixing models is a part of the coupling interface at the core inlet plane, while the second one is the analytical coolant mixing model developed for the downcomer and the lower plenum regions of VVER-440.
The results of DYN3D/ATHLET simulations were assessed both against available measured data and calculations performed with similar multi-physics codes. The paper includes an overview of the simulated problems and the most representative results of DYN3D/ATHLET validation/verification for all coupling modes. The obtained experience of code validation provides a better understanding of reactor transients with a strong interaction between neutron kinetics and thermal hydraulics, helping to improve computation models. This experience is also useful for the present and further activities in coupling of DYN3D with other best estimate codes, like CFX, TRANSURANUS, etc.

Publ.-Id: 21704 - Permalink

Experimental investigation of irregular motion impact on 4D PET based particle therapy monitoring
Tian, Y.; Stützer, K.; Enghardt, W.; Priegnitz, M.; Helmbrecht, S.; Bert, C.; Fiedler, F.;
Particle therapy positron emission tomography (PT-PET) is an in vivo and non-invasive imaging technique to monitor treatment delivery in particle therapy. The inevitable patient respiratory motion during irradiation causes artefacts and inaccurate activity distribution in PET images. 4D maximum likelihood expectation maximization (4D MLEM) allows for a compensation of these effects, but has up to now been restricted to regular motion for PT-PET investigations. However, intra-fractional motion during treatment might differ from that during acquisition of the 4D-planning CT (e.g. amplitude variation, baseline drift) and, therefore, might induce inaccurate 4D PET reconstruction results. This study investigates the impact of different irregular analytical motion patterns on PT-PET imaging by means of experiments with radioactive source and irradiated moving phantoms. Three sorting methods, namely phase sorting, equal amplitude sorting and event-based amplitude sorting, were applied to manage PET list-mode data. The inuence of these sorting methods on the motion compensating algorithm has analysed. The event-based amplitude sorting presented superior performance, although the 4D PT-PET reconstructions still suffered partly from the inexact deformation specifications due to the irregular motion.
Keywords: irregular target motion, 4D PET, particle therapy, dose monitoring

Publ.-Id: 21703 - Permalink

Open volume defects and magnetic phase transition in Fe60Al40 transition metal aluminide
Liedke, M. O.; Anwand, W.; Bali, R.; Cornelius, S.; Butterling, M.; Trinh, T. T.; Wagner, A.; Salamon, S.; Walecki, D.; Smekhova, A.; Wende, H.; Potzger, K.;
Magnetic phase transition in the Fe60Al40 transition metal aluminide from the ferromagnetic disordered A2-phase to the paramagnetic ordered B2-phase as a function of annealing up to 1000°C has been investigated by means of magneto-optical and spectroscopy techniques, i.e., Kerr effect, positron annihilation and Mössbauer spectroscopy. The positron annihilation spectroscopy (PAS) has been performed in-situ sequentially after each annealing step at the Apparatus for In-situ Defect Analysis (AIDA) that is a unique tool combining positron annihilation spectroscopy with temperature treatment, material evaporation, ion irradiation, and sheet resistance measurement techniques. The overall goal was to investigate importance of the open volume defects onto the magnetic phase transition. No evidence of variation in the vacancy concentration in matching the magnetic phase transition temperature range (400-600°C) has been found, whereas higher temperatures showed an increase in the vacancy concentration.
Keywords: FeAl, transition metal aluminides, open volume defects, AIDA, SPONSOR, phase transition, annealing, XRD, CEMS, MOKE, PAS

Publ.-Id: 21702 - Permalink

Charged defects and defect-induced processes in nitrogen films
Savchenko, E.; Khyzhniy, I.; Uyutnov, S.; Barabashov, A.; Gumenchuk, G.; Ponomaryov, A.; Bondybey, V.;
Radiation effects in solid nitrogen irradiated with an electron beam were studied with emphasis on the role of charged centers in radiation-induced phenomena. The experiments were performed employing luminescence method and activation spectroscopy techniques - spectrally resolved thermally stimulated luminescence TSL and thermally stimulated exoelectron emission. Samples were probed in depth by varying electron energy, thus discriminating radiation-induced processes in the bulk and at the surface. Spectroscopic evidence of the excited N2 * (C3Πu) molecule desorption was obtained for the first time and mechanism of the phenomenon based on recombination of electron with intrinsic charged center N4 + was proposed. The key role of N3 + center dissociative recombination in generation of N radicals is suggested.

Publ.-Id: 21701 - Permalink

Prompt-Gamma-Imaging für die Echtzeit-Reichweiten-Verifikation in der Protonentherapie: Auf dem Weg zur klinischen Implementierung
Barczyk, S.; Golnik, C.; Priegnitz, M.; Vander Stappen, F.; Janssens, G.; Smeets, J.; Clementel, E.; Hotoiu, L.; de Xivry, J. O.; Baumann, M.; Enghardt, W.; Fiedler, F.; Krause, M.; Prieels, D.; Pausch, G.; Richter, C.;
Eine besondere Herausforderung der Protonentherapie besteht in der Unsicherheit der Protonenreichweite im Patienten und den resultierenden Unsicherheiten der Dosisverteilung. Hier bietet die Methode der Reichweiten-Verifikation anhand der protoneninduzierten Prompt-Gamma-Emission einen vielversprechenden Ansatz zur Verringerung der Unsicherheiten. Hierfür wurde ein Prototyp einer Prompt-Gamma-Kamera von der Firma IBA entwickelt und für die zukünftige klinische Anwendung an der Dresdner Protonentherapieanlage installiert. In Zusammenarbeit mit IBA erfolgte die umfangreiche Charakterisierung und Vorbereitung der Kamera für die klinische Anwendung. Dies beinhaltete die Hardware- und Softwareentwicklung, Kalibrierung und Qualitätssicherung sowie die Erprobung am Phantom für unterschiedliche Bestrahlungsmodalitäten.
  • Lecture (Conference)
    21. Jahrestagung der DEGRO, 25.-28.06.2015, Hamburg, Deutschland
  • Abstract in refereed journal
    Strahlentherapie und Onkologie 191(2015)1, S35-S36
    DOI: 10.1007/s00066-015-0847-x

Publ.-Id: 21700 - Permalink

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale
Sebastian, T.; Schultheiss, K.; Obry, B.; Hillebrands, B.; Schultheiss, H.;
Spin waves constitute an important part of research in the field of magnetization dynamics. Spin waves are the elementary excitations of the spin system in a magnetically ordered material state and magnons are their quasi particles. In the following article, we will discuss the optical method of Brillouin light scattering (BLS) spectroscopy which is a now a well established tool for the characterization of spin waves. BLS is the inelastic scattering of light from spin waves and confers several benefits: the ability to map the spin wave intensity distribution with spatial resolution and high sensitivity as well as the potential to simultaneously measure the frequency and the wave vector and, therefore, the dispersion properties.

For several decades, the field of spin waves gained huge interest by the scientific community due to its relevance regarding fundamental issues of spindynamics in the field of solid states physics. The ongoing research in recent years has put emphasis on the high potential of spin waves regarding information technology. In the emerging field of \textit{magnonics}, several concepts for a spin-wave based logic have been proposed and realized. Opposed to charge-based schemes in conventional electronics and spintronics, magnons are charge-free currents of angular momentum, and, therefore, less subject to scattering processes that lead to heating and dissipation. This fact is highlighted by the possibility to utilize spin waves as information carriers in electrically insulating materials. These developments have propelled the quest for ways and mechanisms to guide and manipulate spin-wave transport. In particular, a lot of effort is put into the miniaturization of spin-wave waveguides and the excitation of spin waves in structures with sub-micrometer dimensions.

For the further development of potential spin-wave-based devices, the ability to directly observe spin-wave propagation with spatial resolution is crucial. As an optical technique BLS does not only allow to map the spin-wave intensity in general, but it, in particular, enables the realization of sub-micron space resolution. Focusing of the laser beam to a sub-micrometer spot size can be realized by implementing a microscope objective into the optical setup. Over the last decade, this micro-focus BLS technique has become an established method for the investigation of spin waves in microstructured magnetic elements and proved its value in particular regarding magnonics.

In this article, we will discuss the basic principles of the BLS process and illustrate the experimental optical setup. Particular emphasis will be put on the implementation of the high spatial resolution of the BLS microscope and the consequences this has for the experimental realization. In addition, the outline of a computer based operation principle and automated sample positioning will be given. Owing to these improvements in ease of use as well as experimental applicability, the BLS technique has maintained its relevance for investigations of today's research on spin waves in miniaturized magnetic structures. A selection of experiments in this field will be described.
Keywords: Brillouin light scattering, microscopy, spin waves, magnons, magnonics

Publ.-Id: 21698 - Permalink

The Tayler instability in liquid metal batteries and dynamo theory
Weber, N.; Galindo, V.; Kasprzyk, C.; Landgraf, S.; Stefani, F.; Weier, T.;
The Tayler instability (TI), a kink-type current-driven instability, is discussed as a crucial ingredient of an alternative α-Ω stellar dynamo model. In the framework of the Tayler-Spruit dynamo, a finite current helicity generated by the TI may produce an α-effect, transforming an azimuthal into a poloidal magnetic field. Going from astrophysics to engineering, the TI may be relevant for Liquid Metal Batteries, too. In the context of renewable energies, such batteries have recently received considerable interest for large scale energy storage. Their main advantages (cheap raw materials, long life-time, low cost) result from their simple construction. Built as a stable density stratification of two liquid metals separated by a molten salt layer, such batteries can be easily scaled up. In that case, currents in the order of a few kA will appear and possibly trigger the TI. If the resulting fluid flow becomes too strong, it may disrupt the electrolyte layer, leading to a battery failure.
A quasi-static numerical model, using an integro-differential approach for the coupling of velocity and magnetic field, is presented and used to simulate the TI in the medium to low magnetic Prandtl number range (1e−3 to 1e−6 ). The properties of the instability (growth rate, velocities in saturation), the influence of the geometric aspect ratio and scaling laws are explored. The relevance of the TI for Liquid Metal Batteries as well as several possible ountermeasures are discussed. Further, the influence of different axial boundary conditions and the interaction of TI and electro-vortex flow is analysed.
The saturation mechanism of the TI at high magnetic Prandtl numbers is commonly explained by the β-effect. We propose a second, hydrodynamic saturation mechanism for the TI at low magnetic Prandtl numbers. This allows us to explain the moderate fluid velocities, observed by Seilmayer et al. in a liquid metal TI experiment. Finally, we analyse the occurence of kinetic and current helicity at magnetic Prandtl numbers between 1e−3 and 1e−6 and show the limit of the quasi-static approximation. We finish with a description of helicity waves of the saturated TI. It’s occurence, frequency and amplitude are characterised in the astrophysical context.
Keywords: Tayler instability, Liquid Metal Battery, stellar dynamo
  • Lecture (Conference)
    Bifurcations and Instabilities in Fluid Dynamics, 15.-17.07.2015, Paris, Frankreich

Publ.-Id: 21697 - Permalink

Low-dimensional compounds containing cyanido groups. XXVIII. Crystal structure, spectroscopic and magnetic properties of two copper(II) tetracyanidoplatinate complexes with 1,2-diaminopropane
Vavra, M.; Potočňák, I.; Dušek, M.; Čižmár, E.; Ozerov, M.; Zvyagin, S. A.;
Violet crystals of {[Cu(pn)2]2[Pt(CN)4]}[Pt(CN)4]·2H2O (1, pn=1,2-diaminopropane) and blue crystals of [Cu(pn)Pt(CN)4]n·nH2O (2) were prepared under hydrothermal conditions and characterized using elemental analysis, IR and UV–vis spectroscopy and by X-ray crystal structure analysis. Different number of ν(C≡N) absorption bands of these two compounds reflects their different structures. An X-ray crystal structure analysis has shown that complex 1 is of ionic character and is formed from trinuclear [Cu(pn)2–Pt(CN)4–Cu(pn)2]2+ complex cation and discrete [Pt(CN)4]2– anion together with two molecules of crystal water. On the other hand, complex 2 is of polymeric character and is formed by 2D networks of [Cu(pn)Pt(CN)4]n composition and completed by n molecules of crystal water. Magnetic measurements show the presence of a weak antiferromagnetic exchange interaction in complex 1 (Θ = –0.2 K), while the magnetic susceptibility of complex 2 is well described by the model of uniform S = 1/2 spin chain with exchange interaction J/kB = –1.64 K.

Publ.-Id: 21696 - Permalink

Laser Fluoride Nanoceramic And Method For Production Thereof / Lasertechnische, fluoridische Nanokeramika und Methode zur Herstellung
in Russian
Siebold, M.; Schramm, U.; Garibin, E. A.; Gusev, P. E.; Krutov, M. A.; Mironov, I. A.; Osiko, V. V.; Smirnov, A. N.; Tchernova, Y. V.; Hein, J.; Nietzold, D.; Pohl, H.-J.;
(EN) FIELD: chemistry. SUBSTANCE: fluoride nanoceramic is obtained by thermomechanical treatment of the starting crystalline material made from CaF2-YbF3, at plastic deformation temperature to obtain a workpiece in form of a polycrystalline microstructured substance, which is characterised by crystal grain size of 3-100 mcm and a nanostructure inside the grains, by annealing on air at temperature of not less than 0.5 of the melting point with compaction of the obtained workpiece in a vacuum at pressure of 1-3 tf/cm2 until the end of the deformation process, followed by annealing in an active medium of carbon tetrafluoride at pressure of 800-1200 mmHg. The starting crystalline material used can be a fine powder which has been subjected to heat treatment in carbon tetrafluoride, or a moulded workpiece of crystalline material made from the powder and heat treated in carbon tetrafluoride. EFFECT: invention enables to obtain a fluoride nanoceramic with high degree of purity and high uniformity of the structure of said optical material. 4 cl, 3 ex

(RU) Изобретение относится к технологии получения оптических поликристаллических материалов, а именно фторидной керамики, имеющей наноразмерную структуру и усовершенствованные оптические, лазерные и генерационные характеристики. Фторидную нанокерамику получают термомеханической обработкой исходного кристаллического материала, выполненного из CaF2-YbF3, при температуре пластической деформации до получения заготовки в виде поликристаллического микроструктурированного вещества, характеризующегося размером зерен кристаллов 3-100 мкм и наноструктурой внутри зерен, путем отжига на воздухе при температуре не менее 0,5 от температуры плавления с уплотнением полученной заготовки в вакууме при давлении 1-3 тс/см2 до окончания процесса деформации, после чего отжигают в активной среде тетрафторида углерода при давлении 800-1200 мм рт.ст. В качестве исходного кристаллического материала могут быть использованы мелкодисперсный порошок, прошедший термообработку в тетрафториде углерода, или отформованная заготовку кристаллического материала, полученная из порошка и термообработанная в тетрафториде углерода. Изобретение позволяет получать фторидную нанокерамику высокой степени чистоты с повышенной однородностью структуры данного оптического материала. 2 н. и 2 з.п. ф-лы, 3 пр., 1 табл.
  • Patent
    RU2484187 - Erteilung 08.12.2013

Publ.-Id: 21695 - Permalink

Structural investigation of (U0.7Pu0.3)O2-x mixed oxides
Vigier, J.-F.; Martin, P. M.; Martel, L.; Prieur, D.; Scheinost, A. C.; Somers, J.;
Uranium-plutonium mixed oxide containing 30% of PuO2 is a candidate fuel for several fast neutron and accelerator driven reactor systems. In this work, a detailed structural investigation on sol-gel synthesized stoichiometric U0.7Pu0.3O2.00 and substoichiometric U0.7Pu0.3O2-x, using X-ray diffraction (XRD), oxygen 17 magic angle spinning nuclear magnetic resonance (17O MAS-NMR) and X-ray absorption spectroscopy is described. As observed by XRD, the stoichiometric U0.7Pu0.3O2.00 is monophasic with a lattice parameter in good agreement with Vegard’s law, while the substoichiometric U0.7Pu0.3O2-x material is biphasic. 17O MAS-NMR confirmed a random distribution of metal atoms and hence an ideal solid solution behaviour for U0.7Pu0.3O2.00. X-ray absorption near-edge structure (XANES) spectroscopy showed the prevalence of plutonium (III) in U0.7Pu0.3O2-x. Extended X-ray absorption fine-structure (EXAFS) spectroscopy indicated a similar local structure around U and Pu, in agreement with the long-range order determined by XRD.
Keywords: MOX 17O MAS-NMR XAS XRD uranium plutonium

Publ.-Id: 21694 - Permalink

Partikeltherapie-PET – Optimierung der Datenverarbeitung für die klinische Anwendung
Helmbrecht, S.;
Die Strahlentherapie ist einer der drei Partner im interdisziplinären Feld der Onkologie. In Europa, Asien und den USA besteht zunehmend die Möglichkeit einer Therapie mit Strahlen aus geladenen Ionen anstelle von Photonen. Eine Anlage in Dresden befindet sich in der Kommissionierungsphase.
Die Ionenstrahltherapie bietet den Vorteil einer sehr konformalen Behandlung des Tumorvolumens durch die endliche Reichweite der Strahlen und ein ausgeprägtes Dosismaximum kurz vor dem Ende des Strahlpfades. Da eine Therapie in der Regel über bis zu 30 Sitzungen an verschiedenen Tagen durchgeführt wird und der Strahlweg stark von dem durchdrungenen Gewebe beeinflusst wird, sind Verfahren für eine in vivo Verifikation der Strahlapplikation wünschenswert. Eine dieser Methoden ist die Partikeltherapie–Positronen-Emissions-Tomografie (PT-PET). Sie beruht auf der Messung der vom Therapiestrahl erzeugten β+-Aktivitätsverteilung. Da eine direkte Berechnung der Dosis aus der Aktivität in lebendem Gewebe nicht möglich ist, wird die gemessene Aktivitätsverteilung mit einer berechneten Vorhersage verglichen und anschließend entschieden, ob die nächste Therapiesitzung wie geplant erfolgen kann oder Anpassungen notwendig sind. Die vorliegende Arbeit beschäftigt sich mit drei Themen aus dem Bereich der Datenverarbeitung für die PT-PET.
Im ersten Teil wird ein Algorithmus zur Bestimmung von Reichweitendifferenzen aus zwei β+- Aktivitätsverteilungen adaptiert und evaluiert. Dies geschieht zunächst anhand einer Simulationsstudie mit realen Patientendaten. Ein Ansatz für eine automatisierte Analyse der Daten lieferte keine zufriedenstellenden Ergebnisse. Daher wird ein Software-Prototyp für eine semiautomatische, assistierte Datenanalyse entwickelt. Die Evaluierung erfolgt durch Experimente mit Phantomen am 12C-Strahl.
Die erzeugte Aktivitätsverteilung wird von physiologischen Prozessen im Organismus beeinflusst.
Dies führt zu einer Entfernung von Emittern vom Ort ihrer Erzeugung und damit zu einer Verringerung der diagnostischen Wertigkeit der erfassten Verteilung. Zur Quantifizierung dieses als Washout bezeichneten Effektes existiert ein am Tierexperiment gewonnenes Modell. Dieses Modell wird im zweiten Teil der Arbeit auf reale Patientendaten angewendet. Es konnte gezeigt werden, dass das Modell grundsätzlich anwendbar ist und für die betrachtete Tumorlokalisation Schädelbasis ein Washout mit einer Halbwertszeit von (155,7±4,6) s existiert.
Die Berechnung der Vorhersage der β+-Aktivitätsverteilung kann durch übliche Monte-Carlo-Verfahren erfolgen. Dabei werden die Wechselwirkungsquerschnitte zahlreicher Reaktionskanäle benötigt. Als alternatives Verfahren wurde die Verwendung gemessener Ausbeuten (Yields) radioaktiver Nuklide in verschiedenen Referenzmaterialien vorgeschlagen. Auf Basis einer vorhandenen Datenbank dieser Yields und einer existierenden Condensed-History-Monte-Carlo-Simulation wird ein Programm zur Berechnung von Aktivitätsverteilungen auf Yieldbasis entwickelt. Mit der Methode kann die β+-Aktivitätsverteilung in Phantomen und Patienten zufriedenstellend vorhergesagt werden.
Die entwickelten Verfahren sollen einen Einsatz der PT-PET im klinischen Umfeld erleichtern und damit einen breiten Einsatz ermöglichen, um das volle Potential der Ionenstrahltherapie nutzbar zu machen.
  • Open Access LogoWissenschaftlich-Technische Berichte / Helmholtz-Zentrum Dresden-Rossendorf; HZDR-058 2015


Publ.-Id: 21693 - Permalink

Field-dependent de Haas-van Alphen frequencies in the non-centrosymmetric compound CrGe
Klotz, J.; Goetze, K.; Bruin, J.; Geibel, C.; Rosner, H.; Weber, K.; Schmidt, M.; Wosnitza, J.;
  • Poster
    DPG Frühjahrstagung, 15.-20.03.2015, Berlin, Deutschland

Publ.-Id: 21692 - Permalink

Improving material properties and performance of nuclear targets for transmutation-relevant experiments
Vascon, A.; Wiehl, N.; Runke, J.; Drebert, J.; Reich, T.; Trautmann, N.; Cremer, B.; Kögler, T.; Beyer, R.; Junghans, A. R.; Eberhardt, K.; Düllmann, C. E.;
To improve the properties and performance of thin layers produced by molecular plating as targets for nuclear experiments investigations with lanthanide elements (i.e., natural Nd and 147Sm-enriched Sm) were carried out. Plating parameters like roughness of the deposition substrate, plating solvent, electrolyte concentration, and applied current density were varied. The influence of each parameter on the properties of the layers was studied by characterizing the deposits. The characterizations showed that nuclear targets perform differently depending on their layer properties. The results obtained from the investigations were applied for the quantitative preparation of homogeneous large-area (i.e., 42 cm2) 242Pu targets to be used for transmutation-relevant experiments.
Keywords: Molecular plating Improved layer properties α-Particle spectroscopy 242Pu Transmutation

Publ.-Id: 21691 - Permalink

Magnetfelder für die Forschung
Wosnitza, J.;
Magnetfelder wirken auf bewegliche Ladungsträger und die magnetischen Freiheitsgrade eines Materials. Sie können somit das Verhalten von Materialien ebenso vielfältig beeinflussen wie z. B. Temperatur und Druck. Hohe Magnetfelder erlauben deshalb in der Physik und vielen anderen Forschungsdisziplinen grundlegende Untersuchungen der elektronischen und magnetischen Eigenschaften der Materie. So sind mehr als 15 Nobelpreise in Physik, Chemie und Medizin eng mit der Forschung in Magnetfeldern verknüpft. Nicht nur deshalb wächst die wissenschaftliche Nachfrage nach Forschungsanlagen, in denen Experimente in hohen Magnetfeldern möglich sind.
  • Book chapter
    in: Physik für Wissenschaftler und Ingenieure 7. deutsche Auflage, Berlin Heidelberg: Springer-Verlag, 2015, 978-3-642-54165-0, 904
    DOI: 10.1007/978-3-642-54166-7

Publ.-Id: 21690 - Permalink

Selenium uptake by cementitious materials: Effect of the redox state
Tits, J.; Rojo, H.; Scheinost, A. C.; Lothenbach, B.; Wieland, E.;
Safety assessment studies for low- and intermediate level nuclear waste (L/ILW) repositories predict selenium-75 to be an important dose-determining radionuclide due to its long half-live and its presence in the anionic form resulting in weak retention by common near- and far field minerals. However, such predictions ignore the potential uptake by positively charged anion exchangers present in the cementitious near-field of a L/ILW repository, such as ettringite and hydrocalumite (AFm phases), a group of Ca, Al–layered double hydroxides.
The objective of this work is to investigate the immobilisation of Se under the alkaline and reducing conditions existing in a cement-based repository (-230mV < Eh < -750 mV, 10.0 < pH < 13.5). Under these conditions, Se(IV) and Se(-II) are the dominating redox states and the aqueous Se speciation is dominated by anionic species SeO32-, HSe2- and a series of polyselenides, mainly Se22-, Se32- and Se42-.
Keywords: Selenium Nuclear waste Redox cement
  • Lecture (Conference)
    Migration 2015, 13.-18.09.2015, Santa Fe, USA

Publ.-Id: 21689 - Permalink

Influence of Growth Temperature on Structural, Optical, Electrical Properties and the Material Composition of RF Sputtered Zn1-xMgxO:Al Thin Films
Schurig, P.; Kramm, B.; Zhou, S.; Polity, A.; Meyer, B.;
Zn1-xMgxO:Al (0.32 ≤ x ≤ 0.43) films were prepared by RF sputter deposition on c-sapphire and soda lime glass substrates with increasing growth temperatures from 298 up to 673 K. A ceramic ZnMgO:Al target was used as deposition material. The influence of the growth temperature on the structural, optical and electrical properties as well as the surface morphology and thin film composition was investigated. The grown films were all poly crystalline with a preferred out of plane orientation associated with the (002) XRD-reflection of ZnO but with a rising (111) MgO peak for higher temperatures. An increase in growth temperature results in a phase evolution from hexagonal to a mixed wurzite/rocksalt phase, a shift of the band gap to higher values as well as a rise in Mg concentration. A direct influence on surface
  • Lecture (Conference)
    2015 MRS Spring Meeting, 06.-10.04.2015, San Francisco, USA

Publ.-Id: 21688 - Permalink

Iron and phosphorus speciation in Fe-conditioned membrane bioreactor activated sludge
Wu, H.; Ikeda-Ohno, A.; Wang, Y.; Waite, T. D.;
Iron dosing of membrane bioreactors (MBRs) is widely used as a means of meeting effluent phosphorus targets but there is limited understanding of the nature of iron and phosphorus-containing solids that are formed within the bioreactor (an important issue in view of the increasing interest in recovering phosphorus from wastewaters). In this study, bench scale MBRs were dosed with either ferrous or ferric salts and the Fe and P-containing mineral distributions in the Fe-conditioned sludges determined using X-ray absorption spectroscopy (XAS). Regardless of whether iron was dosed to the anoxic or aerobic chambers and regardless of whether ferrous (Fe(II)) or ferric (Fe(III)) iron was dosed, iron present in the minerals in the conditioned sludges was consistently in the +III oxidation state. Significant proportions of an Fe(III) mineral exhibiting very similar EXAFS spectra to strengite were present in all cases with the remaining fraction dominated by lepidocrocite in the Fe(II)-dosed case and ferrihydrite in the Fe(III)-dosed case. Approximately half the phosphorus in the activated sludge samples was present as a distinct Fe-PO4 mineral (such as strengite or an amorphous ferric hydroxyl phosphate analog) and half as phosphorus adsorbed to an iron oxyhydroxide mineral phase indicating that both co-precipitation and adsorption of phosphorus with iron contribute to removal of phosphorus from the MBR supernatant.
Keywords: Iron, Phosphor, Sulfur, Waste water treatment, Membrane Bioreactors, XAS, Speciation

Publ.-Id: 21687 - Permalink

Positron studies of interaction between yttrium atoms and vacancies in bcc iron with relevance for ODS nanoparticles formation
He, C. W.; Barthe, M. F.; Desgardin, P.; Akhmadaliev, S.; Behar, M.; Jomard, F.;
The very high calculated binding energy of vacancy (V)-Y-sub (1.45 eV) in Fe makes it be one possible earliest formation stage of (Y, Ti, O) nanoclusters in ODS alloy. Our direct slow positrons annihilation observations are used to valid the interaction between V and Y. The pure bcc iron samples have been implanted by 1.2 MeV Y ions at three fluences from 1 x 10(14) to 3 x 10(15) cm(-2). Vacancy clusters are observed for all these three fluences. Their size and concentration decrease with Y concentration measured by using SIMS. Two hypotheses are proposed to explain the results, including the formation of complexes V-m-Y-n, and/or of precipitates Y-m-X-n (X = Y, O, etc.). In addition, vacancy clusters are detected deeper than predicted by SRIM calculation due to, at least for a part, channelling which is confirmed by Marlowe calculation and SIMS measurements.
Keywords: Nanostructured ferritic alloys, Dispersion, Metals, FE

Publ.-Id: 21686 - Permalink

New RP-CVD grown ultra-high performance selectively B-doped pure-Ge 20 nm QWs on (100)Si as basis material for post-Si CMOS technology
Mironov, O. A.; Hassan, A. H. A.; Uhlarz, M.; Kiatgamolchai, S.; Dobbie, A.; Morris, R. J. H.; Halpin, J. E.; Rhead, S. D.; Allred, P.; Myronov, M.; Gabani, S.; Berkutov, I. B.; Leadley, D. R.;
Magnetotransport studies at low and room temperature are presented for two-dimensional hole gases (2DHG) formed in fully strained germanium (sGe) quantum wells (QW). Two designs of modulation doped heterostructure grown by reduced pressure chemical vapour deposition (RP-CVD) were used and included a normal structure (doping above the Ge channel and inverted structure (doping beneath the Ge channel). The mobility (μH) for the normal structure was measured to be 1.34×106 cm2/Vs with a sheet density (ps) of 2.9×1011 cm-2 at 1.5 K, and μH = 3970 cm2/Vs and ps ~1×1011 cm-2 for room temperature, determined from simulation using the Maximum Entropy- Mobility Spectrum Analysis (ME-MSA) method.
For the inverted structure a μH of 4.96×105 cm2/Vs and ps of 5.25×1011 cm-2 was measured at 90 mK. From the temperature dependent amplitude of Shubnikov de Haas oscillations, the normal structure was found to have a very low effective mass (m*) value of 0.063 m0 and a ratio of transport to quantum lifetime (α) of ~78. This extremely high α is indicative of the carrier transport being dominated by small angle scattering from remote impurities i.e. a sample having an extremely low background impurity level and very smooth hetero-interfaces. The inverted structure had an m* of 0.069 m0 and α ~29, which also indicates exceedingly high quality material.
Keywords: pure strained Ge channel, ultra-high mobility, SdH oscillation, impurity scattering

Publ.-Id: 21685 - Permalink

Bi2Se3Q-switched Nd:YAG ceramic waveguide laser
Tan, Y.; Zhang, H.; Zhao, C.; Akhmadaliev, S.; Zhou, S.; Chen, F.;
Using a topological insulator (TI) Bi2Se3 as a saturable absorber, highly stable Q-switched laser pulses were realized in an Nd:YAG ceramic waveguide fabricated by carbon ion irradiation. The laser operation was at a wavelength of 1064 nm, with a repetition rate ranging from 2.7 to 4.7 MHz. The minimum pulsed duration was 46 ns. The maximum output power was up to 168.6 mW corresponding to the pulse energy of 31.3 nJ. This work opens up a practical way for implementation of TI modulated pulsed laser devices in dielectric waveguide platforms.
Keywords: Integrated optics, Lasers, Q-switched, Waveguides, Ion irradiation

Publ.-Id: 21684 - Permalink

Visualization of Heterogeneous Diffusion Processes with PET aligned with 3D FE simulation results
Kulenkampff, J.; Gründig, M.; Zakhnini, A.; Schikora, J.; Gerasch, R.; Lippmann-Pipke, J.;
Positron-Emission-Tomography (PET) provides directly the spatial distribution of tracer concentrations with ultimate sensitivity and thus is particularly suited for visualizing the propagation of chemical species in opaque media (Kulenkampff et al. 2013). The method of sequential PET-imaging of the tracer distribution for quantifying diffusion parameters of heterogeneous opaque materials overcomes fundamental problems of common analytical methods, which either are destructive or without spatial resolution. However, these parameters are crucial for the safety analysis of geologic waste repositories in clay (Van Loon et al. 2004), for instance.
We apply longer-living nuclides than in common clinical PET-applications, like 58Co (T1/2=70.86 d) and 22Na (T1/2=2.603 a), and we have to consider the higher density of our specimens, which causes significant attenuation and scattering of photon radiation. These attenuation and scattering effects of the material, as well as the effects of parasitic gamma-radiation of the non-standard PET-nuclides have been quantified with Monte-Carlo-Simulations and are corrected (Zakhnini et al. 2013).
For instance, Opalinus clay rock cores were charged with solutions labelled with the PET-nuclide, and then the tracer distribution was sequentially imaged with PET (Kulenkampff et al. 2015). We aligned the 4D data set with FE simulation results (Comsol Multiphyiscs) and obtained the anisotropic diffusion coefficients. The residuals from the optimized model are attributed to structural inhomogeneities and heterogeneous composition.
Keywords: Diffusion, positron-emission-tomography, tracer
  • Lecture (Conference)
    7th International Symposium on Prcess Tomography, 01.-03.09.2015, Dresden, Deutschland

Publ.-Id: 21683 - Permalink

The Rossendorf Beamline at ESRF – dedicated to investigate radionuclides with X-ray absorption spectroscopy
Hennig, C.;
Overwiew about research activities at the Rossendorf Beamline/Grenoble.
Keywords: EXAFS, XRD, Actinides
  • Lecture (others)
    Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces, CNRS, Grenoble, 13.02.2015, Grenoble, France

Publ.-Id: 21682 - Permalink

Uranium and uranyl luminescence in agate/chalcedony
Götze, J.; Gaft, M.; Möckel, R.;
A systematic investigation of agates from occurrences around the world revealed that macrocrystalline quartz and chalcedony of these samples have unusual high U content. The content of U in agates may reach more than 70 ppm and is in contrast to crystalline quartz from magmatic and metamorphic rocks as well as pegmatite quartz which have U concentrations in the sub-ppm level. Spatially resolved trace-element analyses by LA-ICP-MS illustrate that the distribution of U within the agate samples is heterogeneous and is related to the structural banding. The results indicate that U is incorporated as uranyl ion which is bound to the silica surface and originates from the parallel accumulation of Si and U by alteration processes of surrounding host rocks during agate formation.
The uranyl ion is the cause for the greenish photoluminescence (PL) in agate, which can only be excited by short wavelengths (< 300 nm). The green PL is due to the electron transition from an excited level 1φ1u(1δ1u) back to the 1π3g level and is shown by a typical emission line at ca. 500 nm accompanied by several equidistant lines. These are due to the harmonic vibration of oxygen atoms along the uranyl axis. Luminescence can be detected in samples with U content down to the 1 ppm level.
Keywords: Luminescence, green PL, uranium, uranyl, agate, chalcedony, quartz

Publ.-Id: 21681 - Permalink

Analysis of mineral grades for geometallurgy: combined element to mineral conversion and quantitative X-ray diffraction
Parian, M.; Lamberg, P.; Möckel, R.; Rosenkranz, J.;
Knowledge of the grades of valuable elements and their variation is rarely sufficient for geometallurgy. Minerals define not only the value of the deposit, but also the method of extraction and concentration. A number of methods for obtaining mineral grades were evaluated with a focus on geometallurgical applicability, precision and trueness. For geometallurgical program, the number of samples to be analyzed is huge, therefore a method for obtaining mineral grades needs to be cost-efficient, relatively fast, and reliable. Scanning electron microscopy based automated mineralogy is generally regarded as the most reliable method for analyzing mineral grades. However, the method is time demanding and expensive. Quantitative X-ray diffraction has a relatively high detection limit, 0.5%, while the method is not suitable for some base and precious metal ores, but still provides significant details on gangue mineral grades. The usage of the element to mineral conversion has been limited to simple mineralogy because the number of minerals is limited by the number of elements analyzed. This study investigates a new method for the estimation of mineral grades applicable for geometallurgy by combining both quantitative X-ray diffraction with Rietveld refinement and the element to mineral conversion method. The proposed method not only delivers the required turnover for geometallurgy, but also overcomes the shortcomings if XRD or EMC is used alone.

Publ.-Id: 21680 - Permalink

On the Feasibility of using Ex-core Neutron Instrumentation for Reactor State Diagnosis during Accidents
Brachem, C.; Konheiser, J.; Hampel, U.;
In the case of a severe reactor accident, knowledge of the coolant level and the state of the core, including the progress of a possible core melt, would be of crucial interest. In such a scenario, the in-core instrumentation will most likely not be available. In this work, we explore the possibility of using the ex-core neutron detectors to gain information about the state of the reactor pressure vessel (RPV) inventory for a light water reactor. These detectors, which are typically implemented as ionization chambers, are located inside the biological shield and might still be operational during a severe accident. Stationary Monte Carlo calculations using the radiation transport code MCNP were performed to simulate the transport of neutrons outside the RPV and the reactions of the ionization chambers. These detector signals are computed for different model reactor states which might occur during a severe accident with core meltdown. The reactor model is based on data from a typical German Pressurized Water Reactor.
The results indicate that a change in coolant level should be detectable. Due to the core’s neutron self-shielding, deformations in the inner core region, such as the formation of a cavity, do not yield different signal rates in the ex-core neutron chambers. Changes not confined to the centre of the core, such as the relocation of corium into the lower head, re detectable by their change in the ionization chambers’ reaction rates.
Keywords: reactor accident, ex-core neutron detectors, MCNP, Pressurized Water Reactor
  • Lecture (Conference)
    23rd International Conference on Nuclear Engineering (ICONE), 17.-21.05.2015, Chiba, Japan
  • Contribution to proceedings
    23rd International Conference on Nuclear Engineering (ICONE), 17.-21.05.2015, Chiba, Japan

Publ.-Id: 21679 - Permalink

SRF Gun – A Candidate for Future CW Linear Accelerators
Arnold, A.;
The success future continuous wave (CW) linear accelerators (LINAC) depend strongly on the development of appropriate sources. Thus, high brightness electron injectors for CW operation with megahertz pulse repetition rates and high bunch charges up to 1 nC are a hot topic of contemporary accelerator research and development. Present state-of-the-art CW photo electron sources are limited to a medium acceleration field; DC guns because of high-voltage discharge and normal conducting RF (NCRF) guns because of the dissipated power that scales with the square of the surface magnetic field (P~H²). Thus, in both cases the beam quality as well as the maximum extractable bunch charge is limited.
To get rid of these limitations the SRF gun concept is merging the well-established NCRF gun technology with the superconductivity. The resulting saving on dissipated power allows comparable high acceleration fields in continuous wave operation and thus high brightness and high average current at the same time. The talk will concentrate on the most advance electron source of this kind, the ELBE 3.5 cell SRF gun of Helmholtz-Zentrum Dresden-Rossendorf. Beside a historical classification and an overview on different design concepts, recent results as well as future challenges are discussed.
  • Lecture (others)
    Beschleunigerseminar am Institut für Kernphysik, 28.01.2015, Mainz, Deutschland

Publ.-Id: 21678 - Permalink

Study of the uncertainties due to position change of the PWR aeroball measurement system (AMS)
Konheiser, J.; Seidl, M.; Brachem, C.; Mueller, S.;
The Aeroball measurement system (AMS) is an important in-core instrumentation in German pressurized water reactors. Therefore it is essential to know the possible uncertainties of this system. One is the lack of knowledge of the positions of balls in the guide tubes. The position changes can be up to 7 mm. Since the neutron flux distribution is not constant across the guide tubes, different reaction rates can result from the displacements. Both fuel assembly and full core calculations were carried out with the Monte Carlo code MCNP5. Differences in the reaction rates of up to 2% could be determined. In the most cases, differences are only up to 0.5%. The results were hardly influenced by burnup and boron concentration in the water moderator. For fuel assemblies containing gadolinium as a burnable poison a more pronounced reduction could be observed in the direction towards the gadolinium fuel rods. Overall it was found that the AMS measurement values are very robust with regard to possible variations of ball positions.
Keywords: PWR, Aeroball measurement system (AMS), uncertainty, Monte Carlo caculation

Publ.-Id: 21677 - Permalink

U(VI) retention by montmorillonite at high salinities: Surface complexation modeling
Fritsch, K.; Schmeide, K.;
Argillaceous rock is one option for hosting radioactive waste repositories in deep geological formations in Germany. Furthermore, clays are considered as backfill material in a variety of nuclear repository types. While South German clay deposits have ionic strengths below 0.5 mol kg-1, the ionic strengths found in North German clay deposits can be as high as 4.5 mol kg-1. Radionuclide retention by clays at such high ionic strengths is rarely investigated and therefore dealt with in the present work.
Montmorillonite serves as model clay in uranium sorption experiments. NaCl is used as background electrolyte. The sorption data generated in the experiments are then processed with surface complexation models to generate thermodynamic formation constants.
Keywords: uranium sorption, argillaceous rock,clay, uranium, montmorillonite, high ionic strength, surface complexation modelling
  • Contribution to proceedings
    International Workshop ABC-Salt (IV) - Actinide Brine Chemistry in a Salt-Based Repository, 14.-15.04.2015, Heidelberg, Deutschland
  • Lecture (Conference)
    International Workshop ABC-Salt (IV) - Actinide Brine Chemistry in a Salt-Based Repository., 14.-15.04.2015, Heidelberg, Germany

Publ.-Id: 21675 - Permalink

Felsenkeller shallow-underground accelerator laboratory for nuclear astrophysics
Bemmerer, D.; Akhmadaliev, S.; Cowan, T. E.; Gohl, S.; Grieger, M.; Ilgner, C.; Junghans, A. R.; Müller, S. E.; Reinhardt, T. P.; Rimarzig, B.; Reinicke, S.; Röder, M.; Schmidt, K.; Schwengner, R.; Stöckel, K.; Szücs, T.; Takács, M. P.; Wagner, A.; Wagner, L.; Zuber, K.;
Underground, low-background accelerator-based experiments are an important tool to study nu- clear reactions directly at energies relevant for astrophysical processes. This technique has been developed and proven at the 0.4 MV LUNA accelerator in the Gran Sasso laboratory in Italy, shielded from cosmic rays by 1400 m of rock. However, the nuclear reactions of helium and car- bon burning and the neutron source reactions for the astrophysical s-process require higher beam energies. The same is true for the study of solar fusion reactions. Therefore, the NuPECC long range plan for nuclear physics in Europe strongly recommends the installation of one or more higher-energy underground accelerators.
Detailed background studies have shown that the Felsenkeller shallow-underground laboratory in Dresden, with a rock overburden of 45 m, has very low background in γ -ray detectors typical for nuclear astrophysics experiments when an additional active shield is used to veto the remaining muon flux.
A used 5 MV pelletron tandem with 250 μ A upcharge current and external sputter ion source is currently being refurbished for installation in Felsenkeller. Work on an additional radio-frequency ion source on the high voltage terminal is underway. The project is fully funded, and the installa- tion of the accelerator in the Felsenkeller laboratory is expected for the near future.
Keywords: Felsenkeller Nuclear Astrophysics Low-background techniques Solar fusion
  • Open Access LogoContribution to proceedings
    Nuclei in the Cosmos XIII, 07.-11.07.2014, Debrecen, Ungarn
    Proceedings of Science 044


Publ.-Id: 21674 - Permalink

Development and application of computational fluid dynamics approaches within the European project THINS for the simulation of next generation nuclear power systems
Papukchiev, A.; Roelofs, F.; Shams, A.; Lecrivain, G.; Ambrosini, W.;
Today computational fluid dynamics (CFD) is widely used in industrial companies, research institutes and technical safety organizations to supplement the design and analysis of diverse technical components and large systems. Such numerical programs are applied to better understand complex fluid flow and heat transfer phenomena. In the last decades there is an increasing interest in the nuclear community to utilize such advanced programs for the evaluation of different nuclear reactor safety issues, where traditional analysis tools show deficiencies. Within the FP7 European project THINS (Thermal Hydraulics of Innovative Nuclear Systems), CFD and coupled 1D-3D thermal–hydraulic simulations are being carried out. These are dedicated to the analysis of the thermal–hydraulics of gas, liquid metal and supercritical water cooled reactors. Such concepts utilize innovative fluids, which have different properties from the ones used in the current nuclear reactors. In order to improve the thermal–hydraulic predictions of their behavior, CFD development, application and validation activities are performed within THINS. This overview paper highlights some of the CFD related work within the European project.

Publ.-Id: 21673 - Permalink

Experimental study on the radial distribution of the main transition velocities in bubble columns
Nedeltchev, S.; Hampel, U.; Schubert, M.;
The effect of the radial position on the main transition velocities in bubble columns has not been reported in the literature hitherto. In this work, the information entropies IE were extracted in a new way from local gas holdup fluctuations measured by a wire-mesh sensor at different radial positions in both small (0.15 m in ID) and large (0.4 m in ID) bubble columns. On the basis of well-defined local minima in the IE profiles, the transition velocities Utrans at the different radial positions were identified successfully. It was found that in the small column the first transition velocity Utrans,1 (corresponding to the end of the gas maldistribution regime) was somewhat lower in the center of the column as compared to the wall. In the large column, the Utrans,1 value in the center was somewhat higher than the one at the wall. The second transition velocity Utrans,2 (corresponding to the onset of the churn-turbulent regime) in the small column was slightly higher at the core of the column. In the large column, the Utrans,2 value was changing constantly from UG=0.089 m/s to 0.101 m/s and vice versa. The IE results showed that only at the fifth radial position in the small column and at the third and fourth radial positions in the large column there was a division of the transition regime into first and second transition sub-regimes.
Keywords: Bubble columns; transition velocities; information entropies; number of crossings; local gas holdup fluctuations; wire-mesh sensor
  • Open Access LogoContribution to proceedings
    Eight International Conference On Computational and Experimental Methods in Multiphase and Complex Flow ("Multiphase Flow 2015"), 20.-22.04.2015, Valencia, Spanien
    WIT Transactions On Engineering Sciences (volume 89), Southampton (UK): WIT Press, 1743-3533, 127-138
    DOI: 10.2495/MPF150111

Publ.-Id: 21672 - Permalink

First test of the prompt gamma ray timing method with heterogeneous targets at a clinical proton therapy facility
Hueso Gonzalez, F.; Enghardt, W.; Fiedler, F.; Golnik, C.; Janssens, G.; Petzoldt, J.; Prieels, D.; Priegnitz, M.; Römer, K.; Smeets, J.; Vander Stappen, F.; Wagner, A.; Pausch, G.;
Ion beam therapy promises enhanced tumour coverage compared to conventional radiotherapy, but particle range uncertainties significantly blunt the achievable precision. Experimental tools for range verification in real-time are not yet available in clinical routine. The prompt gamma ray timing method has been recently proposed as an alternative to collimated imaging systems. The detection times of prompt gamma rays encode essential information about the depth-dose profile thanks to the measurable transit time of ions through matter. In a collaboration between OncoRay, Helmholtz-Zentrum Dresden - Rossendorf and IBA, the first test at a clinical proton accelerator (Westdeutsches Protonentherapiezentrum Essen, Germany) with several detectors and phantoms is performed. The robustness of the method against background and stability of the beam bunch time profile is explored, and the bunch time spread is characterized for different proton energies. For a beam spot with hundred million protons and a single detector, range differences of five millimetres in defined heterogeneous targets are identified by numerical comparison of the spectrum shape. For higher statistics, range shifts down to two millimetres are detectable. A proton bunch monitor, higher detector throughput and quantitative range retrieval are the upcoming steps towards a clinically applicable prototype. In conclusion, the experimental results highlight the prospects of this straightforward verification method at a clinical pencil beam and settle this novel approach as a promising alternative in the field of in vivo dosimetry.
Keywords: proton therapy, prompt gamma ray timing, range verification, in vivo dosimetry


Publ.-Id: 21671 - Permalink

Modélisation d’un Ecoulement Turbulent à Bulles dans un Mélangeur Statique type Kenic
Zidouni, F.; Krepper, E.; Rzehak, R.; Lucas, D.; Mataoui, A.;
Des simulations numériques de l’écoulement à bulles dans un mélangeur Kenic ont été effectuées par ANSYS-CFX.14 en utilisant le modèle eulérien à deux fluides mono-dispersés. Une prédiction fiable de la structure de l'écoulement et le comportement des bulles à l'intérieur des éléments du mélangeur est l'objectif de ce travail. Le modèle résout les équations de Reynolds Navier- Stocks en régime stationnaire à trois dimensions pour la phase liquide et gazeuse. Le modèle de la turbulence SST a été considéré pour traiter l'aspect turbulent de l'écoulement. Un nouveau terme source dans les équations de la turbulence permet de considérer l'influence des bulles sur le champ turbulent de l'écoulement. Ce nouveau terme a été développé et validé précédemment pour deux cas simples d’écoulement en conduite et d’une colonne à bulles. Les résultats de la simulation sont comparés aux mesures expérimentales obtenues par la technique de tomographie à rayons X. Les paramètres les plus sensibles du modèle ont été identifiés dans cette étude. La distribution de l’air présente une agglomération importante des bulles au niveau du dernier segment du mélangeur indépendamment de la taille des bulles. Cependant on ne dispose pas de mesures de la fraction volumique d’air au niveau de cette position. Une recommandation pour investiguer expérimentalement cette région et d'autres perspectives on été dégagées dans cette étude.
Keywords: helical static mixer, dispersion, gas-liquid multiphase flow, Euler-Euler two fluid model, CFD simulation
  • Contribution to proceedings
    5ème Congrès Algérien de Mécanique, 25.-29.10.2015, El-Qued, Algerie
  • Lecture (Conference)
    5ème Congrès Algérien de Mécanique, 25.-29.10.2015, El-Qued, Algerie

Publ.-Id: 21670 - Permalink

Prediction method of countercurrent flow limitation in a pressurizer surge line and its evaluation for a 1/10-scale model
Murase, M.; Utanohara, Y.; Kusunoki, T.; Lucas, D.; Tomiyama, A.;
The method for predicting countercurrent flow limitation (CCFL) and its uncertainty in an actual pressurizer surge line of a pressurized water reactor (PWR) using 1/10-scale air–water experimental data, one-dimensional (1D) computations, and three-dimensional (3D) numerical simulations was proposed. As one step of the prediction method, 3D numerical simulations were carried out for countercurrent air–water flows in a 1/10-scale model of the pressurizer surge line to evaluate capability of the 3D simulation method and decide uncertainty of CCFL characteristics evaluated for the 1/10-scale model. The model consisted of a vertical pipe, a vertical elbow, and a slightly inclined pipe with elbows. In the actual 1/10-scale experiment, air supplied into the lower tank flowed upward to the upper tank and water supplied into the upper tank gravitationally flowed downward to the lower tank through the pressurizer surge line. In the 3D simulation, however, water was supplied from the wall surface of the vertical pipe to avoid effects of flooding at the upper end (the 3D simulation largely underestimated falling water flow rates at the upper end). Then, the flow pattern in the slightly inclined pipe was successfully reproduced, and the simulated CCFL values for the inclination angle of θ = 0.6 deg (slope of 1/100) agreed well with the experimental CCFL data. The uncertainty among air–water experiments, 1D computations, and 3D simulations for the 1/10-scale model was dC = +- 0.015 for the CCFL constant of C = 0.50. The effects of θ (θ = 0; 1.0 deg) on CCFL characteristics were simulated and discussed.
Keywords: CCFL, CFD, PWR, surge line
  • Journal of Nuclear Engineering and Radiation Science 2(2016)3, 031021
    DOI: 10.1115/1.4033629

Publ.-Id: 21669 - Permalink

Interaction of anaerobic Mont Terri Opalinus Clay bacteria with plutonium(VI)
Moll, H.; Cherkouk, A.; Bernhard, G.;
The Opalinus clay layer of the Mont Terri Underground Rock Laboratory (Switzerland) is one potential host rock tested for nuclear waste disposal [1]. Bacteria indigenous to such subterranean environments can affect the speciation and hence the mobility of actinides [2]. Thus various investigations [3-7] documented the manifold impact of bacteria on the speciation of plutonium.
Recently, we studied the interaction between Pu and Sporomusa sp. MT-2.99 cells at pH 6.1 with and without adding an electron donor (10 mM Na-pyruvate). This bacterium was isolated from Mont Terri Opalinus clay core samples. At pH 6.1, a moderate to strong impact of Sporomusa sp. cells on the Pu speciation was observed. In contrast to the electron donor free experiments, a clear enrichment of Pu(III) in the biomass (bioreduction) was observed in the presence of 10 mM Na-pyruvate. However, more information is necessary to understand the Pu interaction mechanism in the electron donor free experiments, i.e. the influence of biomass on the reduction of Pu(VI) in the biomass suspensions. In the present study, our focus lies on an improved understanding of the pH-dependent Pu redox chemistry in 0.1 M NaClO4 with and without Sporomusa sp. MT-2.99 cells. The pH range was extended to 3, 4, and 7.
The time-dependent Pu concentrations measured in the supernatants were successfully fitted with bi-exponential decay functions and the time-dependent Pu oxidation state distributions by using mono-exponential decay or growth functions. Redox potential measurements indicated that the cells generated reducing conditions. This ability is pH-dependent. A clear pH influence on both the amount of accumulated Pu and on the interaction process with the biomass could be proven.

The authors thank the BMWi for financial support (contract no.: 02E10618 and 02E10971), Velina Bachvarova and Sonja Selenska-Pobell for isolation and Monika Dudek for cultivation of the strain, as well as the BGR for providing the clay samples.

[1] M. Thury, P. Bossart, Eng. Geol. 52,347-359 (1999).
[2] J.R. Lloyd, G.M. Gadd, Geomicrobiol. J. 28, 383-386 (2011).
[3] P. Panak, H. Nitsche, Radiochim. Acta 89, 499-504 (2001).
[4] M.P. Neu, et al., Radiochim. Acta 93, 705-714 (2005).
[5] H. Moll, et al., Radiochim. Acta 94, 815-824 (2006).
[6] J.C. Renshaw, et al., Biogeochemisty 94, 191-196 (2009).
[7] T. Ohnuki, et al., J. Nucl. Sci. Technol. 46, 55-59 (2009).
Keywords: plutonium, bacteria, Sporomusa sp., Mont Terri Opalinus Clay, biosorption, bioreduction
  • Contribution to proceedings
    MIGRATION 2015, 13.-18.09.2015, Santa Fe, NM, USA
  • Poster
    MIGRATION 2015, 13.-18.09.2015, Santa Fe, NM, USA

Publ.-Id: 21668 - Permalink

Visualisation of high-tech metals in rare earth element ores using High-Speed PIXE
Ziegenrücker, R.; Buchriegler, J.; Dreßler, S.; Hanf, D.; Munnik, F.; Nowak, S.; Renno, A. D.; Scharf, O.; von Borany, J.;
Contrary to popular opinion we have to accept that not every significant enrichment of rare-earth-elements (REE) in the earth’s crust is economically and ecologically exploitable. Deposits of heavy rare earth elements are of particular interest. A further critical point is the knowledge in which phases the elements of interest, ecotoxical as well as deleterious elements are concentrated. This information must be complemented by the determination of grain size and possible intergrowths of mineral phases. These are typical geometallurgical analytical tasks routinely performed by methods of automated mineralogy, like MLA or QEMSCAN. The newly established High-Speed PIXE (Particle Induced X-ray Emission) set-up at HZDR combines the capabilities of electron beam based devices with fast determination of trace elements. On the basis of qualitative studies of the distribution of REE in REE-mineralizations as well as in different REE-minerals like bastnaesite, monazite and xenotim we will prove the importance of this innovative concept for geometallurgical research.
Keywords: SLcam, HSPIXE, High-Speed PIXE, PIXE, Proton, X-Ray
  • Poster
    ANAKON 2015, 23.-26.03.2015, Graz, Österreich

Publ.-Id: 21667 - Permalink

Non-Thermal Induction of Conforamtional Rearrangment in Proteins by Far-Infrared Excitation
Lörincz, I. Z.; Schay, G.; Rauscher, A. A.; Kellermayer, M. S. Z.; Gensch, M.; Malnasi-Csizmadia, A.;
How does a protein respond to infrared excitation? Our aim was to induce a specific non-thermal conformational change of a protein by infrared laser excitation. The fluorescence intensity of an intrinsically fluorescent protein, LSS-mOrange was monitored upon irradiation with a free electron laser at two of its IR absorption peaks (11.36/9.56 microns) and at a wavelength (9.06 microns) where the protein has no absorption. The irradiation at the absorption peaks caused a reversible fluorescence intensity increase on the sec-min timescale.

Publ.-Id: 21666 - Permalink

Bruchmechanische Prüfung von “Alten“ Konstruktionsstählen
Viehrig, H.-W.; Houska, M.; Stroetmann, R.; Sieber, L.; Vetter, B.; Schubert, V.;
In the framework of a research project concerning the brittle fracture resistance of “old” civil steel structures, mechanical and fracture mechanics parameters are determined on specimens from such structural steels. The specimens were sampled from steel structures erected between the years 1904 and 1930. The main focus was on fracture toughness testing according to the Master Curve (MC) approach according to the test standard ASTM E1921. Except one steel all fracture toughness values followed the Master Curve description and gave valid T0 values. The dataset was characterised as inhomogeneous and the MC based evaluation approaches of the SINTAP procedure characterising the brittle fraction of a dataset had to be applied.
Keywords: brittle fracture, impact energy, fracture toughness, Master Curve
  • Contribution to proceedings
    47. Tagung DVM Arbeitskreis Bruchvorgänge und Bauteilsicherheit: Bruchmechanische Werkstoff- und Bauteilbewertung: Beanspruchungsanalyse, Prüfmethoden und Anwendungen, 10.-11.02.2015, Freiberg, Deutschland
    Proceedings der 47. Tagung DVM Arbeitskreis Bruchvorgänge und Bauteilsicherheit: Bruchmechanische Werkstoff- und Bauteilbewertung: Beanspruchungsanalyse, Prüfmethoden und Anwendungen, Berlin: DVM

Publ.-Id: 21665 - Permalink

Master Curve testing of reactor pressure vessel multilayer welding seams
Viehrig, H.-W.; Houska, M.; Altstadt, E.;
Reactor pressure vessel (RPV) multilayer welding seams welded by submerged arc welding show an inhomogeneous welding bead structure. It raises concern whether evaluation of non-uniform material is not amenable to the statistical analysis methods on which the Master Curve approach is based. Particularly with regard to weld metal it can be expected that the cleavage fracture toughness is strongly influenced by the orientation of the Charpy size SE(B) specimen. The T L oriented SE(B) specimen (axis axial and crack propagation in circumferential direction) comprises of various welding beads along the crack front whereas in a L S specimen (axis axial and crack propagation through the thickness) the crack tip is located in one welding bead with an approximately uniform structure.
The paper summarises fracture toughness results measured on welding seams of decommissioned and non-commissioned RPVs of WWER type nuclear reactors and the non-commissioned Biblis-C RPV. Specimens of T L and T S orientation were tested. The results show, that in general the cleavage fracture toughness values, KJc-1T, follow the Master Curve description. However, the number of KJc-1T data outside the 2% and 98% tolerance bounds are more than predicted by the underlying model, which indicates non-uniform material.
There is a large variation in the evaluated through thickness T0 values of the investigated multilayer beltline welding seams. Within the sampling range of the surveillance specimens, T0 values vary with a span of 30 to about 60 K depending on the applied welding technology. The fracture toughness strongly depends on the intrinsic weld bead structure. Hence, the position of the fatigue crack tip of the pre-cracked SE(B) specimen at the multilayer welding seam is crucial and defines the cleavage fracture toughness. Modified Master Curve based evaluation procedures like the MC based approach of the SINTAP procedure were applied to get fracture toughness values which are representative for the most brittle fraction the test series.
Despite of the pronounced non-homogeneity of the micro-structure along the crack front of T L specimens, crack initiation sites are randomly distributed along the crack front. This means that one of the basic assumptions in ASTM E1921, i.e. the uniform distribution of initiation sites, is fulfilled also for the T L specimens from the multilayer weld metal.
Keywords: reactor pressure vessel, welding seam, fracture toughness, Master Curve
  • Contribution to proceedings
    ASME 2015 Pressure Vessels & Piping Conference, PVP2015, 19.-23.07.2015, Boston, USA
    Proceedings of the ASME 2015 Pressure Vessels & Piping Conference Vol. 1B, New York: ASME

Publ.-Id: 21664 - Permalink

Geometallurgy of iron ores
Gutzmer, J.;
Geometallurgy is an emerging field of research that has the aim to quantify compositional variability of ores contained in a deposit. Relevant parameter spaces to be considered include geochemistry, mineralogy, metal deportment and microfabric. These quantitative parameters need to be integrated with macroscopic geological and technical characteristics to define so-called geometallurgical domains, i.e., portions of an ore body that will exhibit similar beneficiation characteristics. This knowledge may then be used to optimize mining schedules and beneficiation routes, to optimize resource and energy efficiency, to maximize product quality and to minimize environmental impact. The value of developing a geometallurgical model is obvious for ore bodies that are either complex and/or of low grade. Important examples include PGE and Au deposits as well polymetallic base metal deposits. In accordance there are a number of case studies for such ore deposit types readily available in literature.

Iron ore deposits are, at least at first sight, not at all complex. In the last four decades very few deposit types have dominated the global supply of iron ore. High-grade iron ore deposits hosted by Precambrian iron formations clearly dominate, as these are often able to produce a direct shipping lump ore (DSO with > 60 wt%) Fe by simple crushing, screening and desliming. In fact, these deposits form the world’s largest virtually monomineralic ore bodies, not uncommonly reaching billions of tons of ore in size. Other deposit types that contribute significantly to the worlds iron ore supply are metamorphosed iron formation deposits (often referred to as taconites), Kiruna-type magnetite-apatite deposits and Robe River-type deposits. Magnetite deposits hosted by mafic/ultramafic intrusive complexes are increasingly gaining economic significance. Common to these deposit types are high concentrations of iron (≥ 50 wt.% Fe, but note that taconite only contains about 35 wt. % Fe) and uniform ore mineralogy, with only hematite, magnetite, and goethite of any significance.

The question thus arises what value geometallurgy may add to the utilization of iron ore deposits. In fact, a number of tangible benefits are being realized by taking this approach. Ore bodies that do not produce DSO require grinding followed by magnetic separation and/or flotation. Pellets need to be produced from the concentrate in order to have a saleable product. To assure that stringent quality requirements by the customer steel mills are being met consistently requires detailed knowledge of ore and gangue mineralogy – and its spatial variability across the ore body. Variations in gangue mineralogy, in particular, will determine concentrations of deleterious elements (Si, Ti, Al, P, S and alkali elments), whereas ore mineralogy will determine the suitability of beneficiation unit operations. Even if mineral assemblages remain uniform, relative proportions and microfabric relations (e.g., mineral grain sizes, intergrowth) will determine comminution and liberation characteristics, thus determining comminution energy requirements.
Keywords: geometallurgy, iron ores
  • Contribution to proceedings
    The Arctic Conference Days 2014, 02.-06.06.2014, Tromso, Norway
    Abstracts and Proceedings of the Geological Survey of Norway, Trondheim: Norsk Geologisk Forening, 72-73

Publ.-Id: 21663 - Permalink

Complexation of f-elements with humic carriers – how dynamic is the equilibrium?
Lippold, H.; Lippmann-Pipke, J.;
In the far-field of a repository, complexation with dissolved humic matter can be crucial in controlling the mobility of actinides in case of their release [1, 2]. For transport modeling, all interactions in the system metal / humic substance / solid surface are presumed to be dynamic equilibrium processes where association and dissociation run permanently. For metal-humic complexes, however, there are indications of a growing resistance to dissociation over time [3-7]. It is thus questionable whether full reversibility is actually given for this interaction. So far, the existence of a dynamic equilibrium has never been proven. In this study, the isotope exchange principle was employed to gain direct insight into the inner dynamics of the complexation equilibrium, including kinetic stabilization phenomena.

Purified humic acids were contacted with terbium(III) as an analogue of trivalent actinides. The systems contained the radioisotope 160Tb at a very small amount, whereas concentrations of non-radioactive 159Tb were varied at a high level, covering a binding isotherm up to the state of saturation. Owing to the high metal loads, flocculation of humic colloids generates a solid-liquid system where adsorbed amounts of 160Tb can be determined by radiometric analysis of the supernatant. 159Tb and 160Tb were introduced simultaneously or consecutively (159Tb followed by 160Tb or vice versa). Contact times with both isotopes were varied within a range of 3 months.

In a first series of experiments, 160Tb was contacted with humic acid that had been pre-equilibrated with 159Tb at a range of concentrations.
Adsorbed amounts of 160Tb were found to be equal to those obtained if both isotopes were introduced at the same time, i.e., the radioisotope represented the solid-liquid distribution of total Tb throughout the binding isotherm, including the plateau region where all available binding sites are occupied. Obviously, there is a permanent exchange of free and humic-bound Tb – evidence of a dynamic equilibrium. The rate of exchange was very high, regardless of how long 159Tb and humic acid had been in contact prior to the addition of 160Tb. There were no indications of stabilization processes.

Completely different results were obtained if the small amount of 160Tb (strictly, [160Tb]Tb) was added first, followed by saturation with non-radioactive 159Tb. For representing the solid-liquid distribution of total Tb in a dynamic equilibrium, the radioisotope was expected to be partly desorbed since the bound fraction of total Tb is lower in the plateau region of the binding isotherm. Desorption occurred in fact, but at much lower rates than those observed for the equilibration process in the reverse procedure. Moreover, the rates proved to be dependent on the time of pre-equilibration with 160Tb (increasing hindrance of desorption). The existence of kinetic stabilization processes was thus substantiated. Evidently, they are confined to the most reactive sites, occupied by the radiolabeled fraction of Tb.

Fitting the time-dependent course of isotope exchange according to first-order kinetics was only successful if at least two components with different rate constants were assumed, suggesting that the very small fraction of sites occupied by [160Tb]Tb (~ 1/10^6) is still only partly affected by the slow exchange kinetics (~ 1/3 slow component).
Nonetheless, this is of relevance since just such extremely low metal loads are to be considered. Extrapolating the fits indicates that it takes up to 2 years until equilibrium is attained. This is, however, a short period compared to the time scale to be covered in predictive transport models. Very low flow velocities must be taken into account.
Therefore, metal exchange between humic carriers and mineral surfaces cannot be neglected, notwithstanding the observed stabilization process since complexation is not restricted in its reversibility.

[1] K. H. Lieser et al., Radiochim. Acta 49, 83 (1990).
[2] G. R. Choppin, Radiochim. Acta 58/59, 113 (1992).
[3] L. Rao et al., Radiochim. Acta 66/67, 141 (1994).
[4] R. Artinger et al., J. Contam. Hydrol. 35, 261 (1998).
[5] S. J. King et al., Phys. Chem. Chem. Phys. 3, 2080 (2001).
[6] H. Geckeis et al., Environ. Sci. Technol. 36, 2946 (2002).
[7] H. Lippold et al., Appl. Geochem. 27, 250 (2012).
  • Poster
    MIGRATION 2015 - 15th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, 13.-18.09.2015, Santa Fe, USA

Publ.-Id: 21661 - Permalink

Countercurrent flow limitation in slightly inclined pipes with elbows
Murase, M.; Kinosgita, I.; Kusunoki, T.; Lucas, D.; Tomiyama, A.;
One-dimensional (1D) sensitivity computations were carried out for air-water countercurrent flows in a 1/15-scale model of the hot leg and a 1/10-scale model of the pressurizer surge line in a pressurized water reactor to generalize the prediction method for countercurrent flow limitation (CCFL) characteristics in slightly inclined pipes with elbows. In the 1D model, the wall friction coefficient fwG of single-phase gas flows was used. The interfacial drag coefficient of fi = 0.03, an appropriate adjustment factor of NwL = 6 for the wall friction coefficient fwL of single-phase liquid flows (NwG = 1 for fwG of single-phase gas flows) and an appropriate adjustment factor of Nde = 6 for the pressure loss coefficient ζe of elbows in single-phase flows were determined to give good agreement between the computed and measured CCFL characteristics. The adjusted factors were used to compute and then discuss effects of the inclination angle and diameter on CCFL characteristics.
Keywords: CCFL, inclined pipe, PWR
  • Journal of Nuclear Engineering and Radiation Science 1(2015)4, 041009
    DOI: 10.1115/1.4031032

Publ.-Id: 21660 - Permalink

Recycling of rare earths from fluorescent lamps: Value analysis of closing-the-loop under demand and supply uncertainties
Machacek, E.; Richter, J. L.; Habib, K.; Klossek, P.;
Rare earth element (REE) recycling remains low at 1%, despite significant uncertainties related to future supply and demand and EU 2020 energy efficiency objectives. We use a global production network framework of REE flows from mine to REE phosphors in energy-efficient lamps to illustrate the potential of closed-loop recycling for secondary supply under different scenarios of primary supply and forecasted demand for LEDs, CFLs and LFLs. We find that different End-of-Life Recycling Rate scenarios for REE secondary supply range between meeting forecasted REE demand and filling primary supply gaps, and competing with primary supply. Our argument centres on diversifying REE sourcing with recycling and the choice between primary and secondary supply. We stress that secondary REE phosphor supply requires further policy support for lamp collection and a discussion of the value of REE phosphor recycling which underlies its economic feasibility.
Keywords: Energy-efficient lamps, Value chain, Recycling, Rare earth elements

Publ.-Id: 21659 - Permalink

Near-wall velocity measurements in the two-phase flow at a gas-evolving electrode
Baczyzmalski, D.; Weier, T.; Kähler, C. J.; Cierpka, C.;
Renewable energy technologies are indispensable in order to limit the CO2 emissions while the worldwide energy demand is steadily growing. Efficient energy storage systems will be required for renewable energy sources which are not available continuously, e.g. wind and solar energy. Chemical energy storage in the form of hydrogen offers a very high energy density in contrast to other systems such as thermal or mechanical energy storage and is therefore one of the most promising candidates for a long-term energy storage. An important technique to convert electric energy from a wind turbine or solar panel into chemical energy is the electrolysis of water, where hydrogen and oxygen gas is generated. However, low efficiencies of about 60 % for typical water electrolyzers are a significant drawback of this technique (Pletcher and Li (2011)). These low efficiencies are partly the result of hydrogen and oxygen gas bubbles, which evolve at the electrodes of the electrolyzer and reduce its free area available for the chemical reaction and increase the ohmic resistance of the electrolyte. Therefore, the efficiency of water electrolysis can be improved by an accelerated removal of the hydrogen gas bubbles from the electrode surface (Fern ́ andez et al (2014), Koza et al (2011)). One method that has been found to be effective in this regard is the use of forced convection.
Forced convection can be generated by simple stirring or more elegantly by body forces. A method that has been a subject of recent studies is the application of magnetic fields (Koza et al (2011), Monzon and Coey (2014), Weier and Landgraf (2013)). The superposition of a magnetic field with the electric field, which is is already present during the electrolysis of water, gives rise to body forces acting directly in the electrolyte, i.e. the so-called Lorentz force. The Lorentz force has its largest value at the wall and decreases exponentially with the distance from the electrode. The advantage of this force distribution is the large shear generated directly in the vicinity of the wall. Due to the viscosity of the fluid also the bulk flow is strongly influenced. At present, there have been only few experimental studies on the effect of Lorentz forces on bubble growth and on the fluid dynamics of the two-phase flow at gas-evolving electrodes (Weier and Landgraf (2013)).
Especially the characterization of the near-wall region is essential to understand the influence of the strong shear on the bubble detachment and the interaction of the bubble driven and Lorentz force driven flow.
In order to investigate both the near-wall and the bulk flow, experiments with advanced measuring and evaluation techniques have been carried out in an undivided electrolysis cell with and without the application of magnetic fields. Bubble trajectories and the velocity field of the surrounding electrolyte were measured simultaneously for this purpose. Fluorescent tracer particles and a laser light illumination were used to measure fluid velocities in the electrolyte. A background illumination with a different wavelength was used to measure the size and trajectory of bubbles by means of shadowgraphy. Bubble shadow and tracer particle images were captured simultaneously by two sCMOS cameras with two different wavelength filters to separate both signals. Fluid velocities were evaluated using particle image velocimetry (PIV) as well as particle tracking velocimetry (PTV). It turned out that the PIV results obtained near the electrode, where high velocity gradients occur, were substantially biased as the result of the high void fraction and the associated light absorption in this region.
However, the knowledge of the near-wall fluid velocities and its gradients is essential as they influence the detachment of bubbles from the electrode. In contrast to correlation based evaluation methods as PIV, particle tracking techniques do not depend on the particle image intensity itself but on the ability to detect particles and track them correctly. For this reason, different image filters were applied to enhance the particle images for a more reliable particle detection. More importantly, a sophisticated tracking algorithm proposed by Ohmi and Li (2000) and adapted by Cierpka et al (2013) was used, which takes the similar movement of neighboring particles into account and thus helps to avoid spurious vectors resulting from particle images which were undetectable in one of two consecutive frames. This approach allows for more precise measurements closer to the electrode as exemplified in Fig.1a). This way, the influence of Lorentz forces on the near-wall velocity distribution was investigated. It will be shown in the final paper that Lorentz forces lead to a significant acceleration close the electrode, especially for higher electric current densities (see Fig.1b)). In addition to the velocity fields, the bubble trajectories were of interest. Therefore, multiple image filters were applied on the bubble shadow images to obtain discernible bubble images. A simple PTV algorithm was used to determine the size and trajectory of bubbles. It will be shown that most of the large rising bubbles have path oscillations and can have a significant impact on the near-wall fluid velocities and mass transfer to the electrode.
The full article will give detailed information on how to extract proper data for the presented experiment with the help of the aforementioned tracking algorithm and will discuss the limits of this approach. The velocity fields obtained with PTV will be compared to those determined with PIV for different current densities with and without the application of Lorentz forces. Moreover, the size and trajectrories of bubbles with path oscillations and their impact on the velocity field and velocity fluctuations will be shown for some exemplary cases.
Keywords: Particle Image Velocimetry, PIV, Particle Tracking Velocimetry, PTV, water electrolysis, Lorentz force
  • Lecture (Conference)
    11th International Symposium on Particle Image Velocimetry (PIV 2015), 14.-16.09.2015, Santa Barbara, California, USA
  • Contribution to proceedings
    11th International Symposium on Particle Image Velocimetry (PIV 2015), 14.-16.09.2015, Santa Barbara, California, USA

Publ.-Id: 21658 - Permalink

A new set of Pitzer parameters for dissolved oxygen and its implication on the U(IV)/U(VI) system.
Bok, F.; Richter, A.; Brendler, V.; Altmaier, M.;
Uranium as a major component in nuclear waste can form various mineral phases in mainly two oxidation states: +IV and +VI. For the modelling of different chemical aspects of a nuclear waste repository in salt rock, a thermodynamic database including Pitzer parameters for all relevant aqueous species is necessary. The latest THEREDA (Thermodynamic Reference Database) data release (no. 9) enables the modelling of uranium species in high saline solutions. The amount of dissolved oxygen is an important parameter for the description of redox-sensitive systems like U(IV)/ U(VI) in aqueous solution, namely when geochemical speciation codes and associated thermodynamic databases directly use oxygen as reaction partner for redox reactions. The O2 solubility’s in aqueous solutions according to the reaction O2(g) ↔ O2(aq) follows Henry’s law (Henry’s law constant KH expressed in mol/kg·101.35 kPa). The respective constant as well as a new set of Pitzer parameters for the solubility in solutions of the oceanic salt system (Na, K, Mg, Ca / Cl, SO4, HCO3/CO3 - H2O(l)) was deduced from data sets collected by IUPAC.
Keywords: THEREDA, database, Pitzer, uranium, oxygen, solubility
  • Lecture (Conference)
    Workshop on Actinide-Brine-Chemistry (ABC-Salt 4), 14.-15.04.2015, Heidelberg, Deutschland

Publ.-Id: 21657 - Permalink

Optical imaging of COX-2: Studies on an autofluorescent 2,3-diaryl-substituted indole-based cyclooxygenase-2 inhibitor.
Tondera, C.; Ullm, S.; Laube, M.; Meister, S.; Neuber, C.; Mosch, B.; Kniess, T.; Pietzsch, J.;
This study aimed at in vivo visualization of cyclooxygenase-2 (COX-2) by optical imaging using a representative compound of a class of autofluorescent 2,3-diaryl-substituted indole-based selective COX-2 inhibitors (2,3-diaryl-indole coxibs). COX-2 was successfully visualized in mice models with phorbol myristate ester (TPA)-induced inflammation or bearing xenografted human melanoma cells by 2-[4-(aminosulfonyl)phenyl]-3-(4-methoxyphenyl)-1H-indole (C1). COX-2 protein expression in both TPA-induced inflammatory sites and human melanoma xenografts was confirmed by immunoblotting. Control experiments using surrogate markers, sham injections, and non-COX-2 expressing melanoma cells further confirmed specificity of tissue association of C1. The merging of therapeutic and diagnostic properties of 2,3-diaryl-indole coxibs may widen the range of applications of COX-2-targeted treatment, e.g., for in situ-guided surgery and ex vivo diagnostics.
Keywords: Fluorescence; Luminescence; Melanoma-associated inflammation; Phorbol myristate ester-induced COX-2 expression; Rodent melanoma xenograft model

Publ.-Id: 21656 - Permalink

Measurement of prompt gamma profiles in inhomogeneous targets with a knife-edge slit camera during proton irradiation
Priegnitz, M.; Helmrecht, S.; Janssens, G.; Perali, I.; Smeets, J.; Vander Stappen, F.; Sterpin, E.; Fiedler, F.;
Proton and ion beam therapies become increasingly relevant in radiation therapy. To fully exploit the potential of this irradiation technique and to achieve maximum target volume conformality, the verification of particle ranges is highly desirable. Many research activities focus on the measurement of the spatial distributions of prompt gamma rays emitted during irradiation. A passively collimating knife-edge slit camera is a promising option to perform such measurements. In former publications, the feasibility of accurate detection of proton range shifts in homogeneous targets could be shown with such a camera. We present slit camera measurements of prompt gamma depth profiles in inhomogeneous targets. From real treatment plans and their underlying CTs, representative beam paths are selected and assembled as one-dimensional inhomogeneous targets built from tissue equivalent materials. These phantoms have been irradiated with monoenergetic proton pencil beams. The accuracy of range deviation estimation as well as the detectability of range shifts is investigated in different scenarios. In most cases, range deviations can be detected within less than 2 mm. In close vicinity to low-density regions, range detection is challenging. In particular, a minimum beam penetration depth of 7 mm beyond a cavity is required for reliable detection of a cavity filling with the present setup. Dedicated data post-processing methods may be capable of overcoming this limitation.
Keywords: proton therapy, prompt gamma imaging, range verification, sensitivity, slit camera

Publ.-Id: 21655 - Permalink

Tracing outburst floods with 10Be and 26Al: Terraces and megaclasts in Boam Gorge, Issyk Kul, Kyrgyzstan
Rosenwinkel, S.; Landgraf, A.; Korup, O.; Schwanghart, W.; Vollkmer, F.; Dzhumabaeva, A.; Merchel, S.; Rugel, G.;
In mountainous areas, some naturally dammed lakes that have formed behind large landslides or glacier-derived debris can remain intact and trap large water bodies over hundreds to several thousands of years. Sudden failure of such natural dams, however, may trigger catastrophic outburst flooding with often substantial geomorphic consequences for downstream river reaches. In this context we investigate Pleistocene to Holocene lake-level fluctuations along the western outlet of the world’s second-largest mountain lake Issyk Kul in the northern Kyrgyz Tien Shan. Specifically, we explore whether the alternating phases of lake closure and external drainage, which was manifested by sedimentary deposits, bathymetric, and geochemical data, were associated with catastrophic outbursts or whether lake-level changes were solely driven by the longer-term effects of climate and basin hydrology. We compute exposure ages from cosmogenic 10Be and 26Al of three large (~4 m) boulders to constrain the timing of potential outburst floods at the outlet of the Boam Gorge where it leaves the mountain belt and debouches onto the Chu Basin, downstream of former spillways from Issyk Kul. We used boulder dimensions to constrain hydraulic palaeo-flood models based on flow competence analysis of different flood scenarios. Our results are consistent with the hypothesis of one or more catastrophic lake outbursts, and compatible with palaeo-lake levels reconstructed from lacustrine sediment stacks upstream. We further report 10Be ages from six depth profiles on terraces at the outlet of the Boam Gorge and the Chon Kemin valley in order to put into context the potential geomorphic work of such outburst floods with the longer-term incision history of the gorge.
Keywords: AMS, geomorphologie, cosmogenic nuclide, TCN
  • Poster
    Meeting of Working Group Geomorphology (AK Geomorphologie) as part of the Deutscher Kongress für Geographie (DKG), 03.-04.10.2015, Berlin, Deutschland

Publ.-Id: 21654 - Permalink

Absolute value determination of vacancy concentration in silicon crystals using low-temperature ultrasonic measurements
Yamada-Kaneta, H.; Okabe, K.; Akatsu, M.; Baba, S.; Mitsumoto, K.; Nemoto, Y.; Goto, T.; Saito, H.; Kashima, K.; Saito, Y.;
For the samples taken from the void region of the CZ silicon crystal grown with the same solidification condition and different thermal histories after the solidification, we measure the magnitude S of the elastic softening which is proportional to the concentration of the single vacancies [V], For these samples, we also measure the size distribution of the void density by using the infrared lightscattering tomography, to evaluate the concentration [Vc] of the vacancies consumed for the void formation. From these two experiments, we find a sum rale [Vc] + a S= C, where C depends only on the solidification condition and is independent of the thermal history after the solidification. This enables us to find the conservation rale of the vacancies [Vc] + [V] = C. The value of the proportionality constant a in the relation [V] = a S is determined. Demonstration of determining the absolute values of [V] from the measured S is given. An estimate is made for the value of the quadrupole-strain coupling constant.
Keywords: Coupling constants; Different thermal history; Elastic softening; Light-scattering tomography; Low temperatures; Single vacancies; Solidification condition; Vacancy concentration

Publ.-Id: 21653 - Permalink

Production and Diagnostics of Dense Matter
Brambrink, E.; Amadou, N.; Benuzzi-Mounaix, A.; Geissel, M.; Harmand, M.; Pelka, A.; Vinci, T.; Koenig, M.;
High energy lasers are a unique tool to create high pressure states above 10 Mbar at ns time scales, which allow to study material properties under these extreme conditions. These conditions are, for example, comparable with planetary cores, where material properties play an important role for the properties and evolution of a planet. The rapid compression allows also to study dynamic effects of phase transitions as compression times are comparable to relaxation times. We will present recent results of laser compression of iron reaching conditions of so called “super-Earth” cores. A description of the compression schemes as well as present and future diagnostics is presented. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Keywords: Warm dense matter;high energy density physics;ramp compression

Publ.-Id: 21652 - Permalink

Evaluation of the cone-shaped pickup performance for low charge sub-10 fs arrival-time measurements at free electron laser facilities
Angelovski, A.; Kuntzsch, M.; Czwalinna, M. K.; Penirschke, A.; Hansli, M.; Sydlo, C.; Arsov, V.; Hunziker, S.; Schlarb, H.; Gensch, M.; Schlott, V.; Weiland, T.; Jakoby, R.;
An evaluation of the cone-shaped pickup performance as a part of the high bandwidth bunch arrival-time monitors (BAMs) for a low charge sub-10 fs arrival-time measurements is presented. Three sets of pickups are installed at the free electron laser FLASH at Deutsches Elektronen-Synchrotron, the quasi-cw SRF accelerator ELBE at the Helmholtz-Zentrum Dresden-Rossendorf and the SwissFEL injector test facility at Paul Scherrer Institute. Measurements and simulations are in good agreement and the pickups fulfill the design specifications. Utilizing the high bandwidth BAM with the cone-shaped pickups, an improvement of the signal slope by a factor of 10 is demonstrated at ELBE compared to the BAM with a low bandwidth.
Keywords: BAM ELBE FLASH Arrival-Time Diagnostic

Publ.-Id: 21651 - Permalink

Pages: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161] [162] [163] [164] [165] [166] [167] [168] [169] [170] [171] [172] [173] [174] [175] [176] [177] [178] [179] [180] [181] [182] [183] [184] [185] [186] [187] [188] [189] [190] [191] [192] [193] [194] [195] [196] [197] [198] [199] [200] [201] [202] [203] [204] [205] [206] [207] [208] [209] [210] [211] [212] [213] [214] [215] [216] [217] [218] [219] [220] [221] [222] [223] [224] [225] [226] [227] [228] [229] [230] [231] [232] [233] [234] [235] [236] [237] [238] [239] [240] [241] [242] [243] [244] [245] [246] [247] [248] [249] [250] [251] [252] [253] [254] [255] [256] [257] [258] [259] [260] [261] [262] [263] [264] [265] [266]