Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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Only approved publications

34730 Publications

Proximity gettering of Fe in SIMOX structures

Skorupa, W.; Yankov, R. A.; Hatzopoulos, N.; Danilin, A.

  • Contribution to external collection
    IIT '96, Austin, Texas, USA; Proc. 11th Int. Conf. Ion Implantation Technology; The Inst. of Electrical and Electronics Eng., Piscataway, USA, 1997, p. 737

Permalink: https://www.hzdr.de/publications/Publ-563
Publ.-Id: 563


Ion Beam Synthesis of SiC in Silicon-on-Insulator

Kögler, R.; Reuther, H.; Voelskow, M.; Skorupa, W.; Romano-Rodriguez, A.; Perez-Rodriguez, A.; Serre, C.; Calvo-Barrio, L.; Morante, J. R.

Ion beam synthesis of ß-SiC in the top-Si-layer of a SIMOX (Separation by Implantation of OXygen) substrate is reported.
All the implanted C is captured inside the 200 nm top-Si-layer and is accumulated preferentially at the Si/SiO2-interface during annealing. A Si/SiC/SiO2-structure is obtained by C implantation at high temperature (T>500 °C) and subsequent annealing treatment (T=1250 °C). It consists of a crystalline Si overlayer, a Si layer with a high density of perfectly aligned ß-SiC grains and a buried oxide layer. Implantation at elevated temperatures is crucial for the quality of the SiC layer. However, the use of such implantation temperatures is limited by the dissolution of the buried oxide layer.

  • Contribution to external collection
    IIT '96, Austin, Texas, USA; Proc. 11th Int. Conf. Ion Implantation Technology; The Inst. of Electrical and Electronics Eng., Piscataway, USA, 1997, p. 709

Permalink: https://www.hzdr.de/publications/Publ-562
Publ.-Id: 562


Impurity gettering in damaged regions of Si produced by high energy ion implantation

Kögler, R.; Panknin, D.; Skorupa, W.; Werner, P.; Danilin, A.

Point defects and defect agglomerates are created by high
energy ion implantation into Si and subsequent annealing. These defects
are investigated by gettering of metal atoms and analysing the metal concentration
distribution. Beside a gettering layer at the projected ion range (Rp)
where the implant is deposited also a gettering layer is also found at
the Rp/2-position. This Rp/2-layer is related to implantation defects -
not to the implant atoms. It is thermally stable up to a temperature of
more than 1000 °C.

  • Contribution to external collection
    IIT '96, Austin, Texas, USA. 11th Int. Conf. Ion Implantation Technology; The Inst. of Electrical and Electronics Engineers, Piscataway, USA, 1997, p. 679

Permalink: https://www.hzdr.de/publications/Publ-561
Publ.-Id: 561


Laser and X-ray spectroscopic studies of uranium-calcite interface phenomena

Geipel, G.; Reich, T.; Brendler, V.; Bernhard, G.; Nitsche, H.

  • Lecture (Conference)
    Workshop JAERT, Japan
  • Journal of Nuclear Materials 248 (1997) 408-411

Permalink: https://www.hzdr.de/publications/Publ-560
Publ.-Id: 560


Investigation of the Development of Irradiation - Induced Precipitates in VVER-440-Type Reactor Pressure Vessel Steels and Weld Metals During Irradiation and Annealing

Große, M.; Nitzsche, P.; Böhmert, J.; Brauer, G.

The development of irradiation-induced precipitates in VVER-440 type reactor pressure vessel steels 15Kh2MFA and weld metals SV-10KhMFT during irradiation and post-irradiation annealing is studied by small angle neutron and X-ray scattering. The kinetic conditions for the precipitation of particles, which already exist in the unirradiated state, seem to be improved at temperatures of about 270 °C due to the irradiation. The size distribution of the irradiation-induced precipitates depends on the copper content and differs between weld and base metal. A strong correlation between the formation of irradiation-induced precipitates and the irradiation hardening is found. The hardness nearly linearly depends on the number of these precipitates.

  • Lecture (Conference)
    18th International Symposium "Effects of Radiation in Materials", Hyannis (USA), June 25 - 27, 1996, ASTM STP 1325

Permalink: https://www.hzdr.de/publications/Publ-559
Publ.-Id: 559


Interpretation and Quality of the Tilted Axis Cranking Approximation

Frauendorf, S.; Meng, J.

Comparing with the exact solutions of the model system of one and two particles coupled to an axial rotor, the quality of the semi classical tilted axis cranking approximation is investigated. Extensive comparisons of the energies and M1 and E2 transition probabilities are carried out for the lowest bands. Very good agreement is found, except near band crossings. Various recipes to take into account finite K within the frame of the usual principal axis cranking are included into the comparison. A set of rules is suggested that permits to construct the excited bands from the cranking configurations, avoiding spurious states.

  • Zeitschrift für Physik A 356 (3): 263-279 DEC 1996
  • Open Access Logo Forschungszentrum Rossendorf; FZR-140 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-558
Publ.-Id: 558


Implantation and growth of large ß-FeSi2 precipitates and a-FeSi2 network structures in silicon

Reuther, H.; Dobler, M.

Iron implanted and subsequently annealed n-type Si(111) was
studied by conversion electron Mössbauer spectroscopy and Auger electron
spectroskopy. Phase analysis performed with Mössbauer spectroscopy indicates
the formation of a mixture of ß- and a-FeSi2 due to the implantation
(200 keV, 3 x 1017 cm-2, 350 °C) and a complete transition of the mixture
to the ß-and the a-phase after annealing at 900 °C for 18 h and
1150 °C for 1 h, respectively. The iron concentration profiles were
determined with Auger electron sputter depth profiling. The profile of the
as-implanted sample is Gaussian shaped and boradened after annealing at 900
°C to a pleateau-like profile. For the sample annealed at 1150 °C
only a slight broadening occurs and depth depending fluctuations of the iron
concentration can be observed. Investigations with scanning Auger electron
spectroscopy show in the case of the as-implanted sample only slight fluctuations
of the iron distribution in the center of the profile. After annealing at
900 °C large separated ß-FeSi2 precipitates grow due to the process
of Ostwald ripening. At 1150 °C Ostwald ripening and coalescence of
the precipitates occur and a wide extended penetration a-FeSi2 network structure
is formed. It is the first time that such large iron disilicide structures
could be proved by scanning Auger electron spectroscopy.

  • Applied Physics Letters 69 (1996) 3176 - 3178

Permalink: https://www.hzdr.de/publications/Publ-557
Publ.-Id: 557


Tritium Depth Profiling in Carbon by Accelerator Mass Spectrometry

Friedrich, M.; Sun, G.; Grötzschel, R.; Behrisch, R.; Garcia-Rosales, C.; Roberts, M. L.

  • Nuclear Instruments and Methods in Physics Research B 123 (1997) pp. 410-413

Permalink: https://www.hzdr.de/publications/Publ-556
Publ.-Id: 556


Ion Beam Processing of SiC

Skorupa, W.; Heera, V.; Pacaud, Y.; Weishart, H.

A short review is presented concerning problems of ion beam processing of single crystalline silicon carbide. Emphasis is given
to recent results on point defect, extended defects, amorphization and recrystallization, electrical activation of dopant atoms, and metallization.

  • Nuclear Instruments and Methods in Physics Research B 120 (1996) 114-120

Permalink: https://www.hzdr.de/publications/Publ-553
Publ.-Id: 553


Speciation of Uranium in Natural Waters of an Uranium Mining Area

Geipel, G.; Bernhard, G.; Brendler, V.; Brachmann, A.; Nitsche, H.

  • Lecture (Conference)
    NRC 4, St. Malo, Sept. 1996

Permalink: https://www.hzdr.de/publications/Publ-551
Publ.-Id: 551


Investigation of the ion acoustic effect during focused ion beam irradiation

Teichert, J.; Bischoff, L.; Köhler, B.

  • Lecture (Conference)
    E-MRS, Strasbourg, 4.-7.6.1996

Permalink: https://www.hzdr.de/publications/Publ-550
Publ.-Id: 550


The use of plasma source ion implantation for wear protection

Günzel, R.; Brutscher, J.; Mändl, S.; Möller, W.

Plasma source ion implantation (PSII) has been developed
as an alternative technique to circumvent the limitations of conventional
ion implantation, like the requirements of a complicated target handling
and beam raster system for a uniform ion implantation of 3-dimensional
samples. In this method, a plasma sheath conformably surrounds the target.
By applying negative high voltage pulses, positively charged ions are accelerated
from the plasma trough the sheath and implanted into the target. Critical
parameters for the further development of this implantation process are
the ion implantation current and the sheath expansion characteristics.

  • Lecture (Conference)
    NATO-ARW, Portimao, Portugal, 30.5.-5.6.1996
  • Book (Authorship)
    Y. Pauleau and P. B. Barna (eds), Protective Coatings and Thin Films, pp. 635-647, c 1997 Kluwer Academic Publishers, Printed in the Netherlands

Permalink: https://www.hzdr.de/publications/Publ-547
Publ.-Id: 547


Consideration of Added Stiffness Resulting from Edging Out of an Axial Annular Flow by Motions of the Pressure Vessel and the Core Barrel

Zoller, J.; Altstadt, E.; Grunwald, G.; Zimmermann, W.

  • Lecture (Conference)
    IMORN '26, Piestany, May 27 - 29, 1996

Permalink: https://www.hzdr.de/publications/Publ-546
Publ.-Id: 546


Charge pickup of 238U at relativistic energies

Seidel, W.; Möhlenkamp, T.; Rubehn, T.; u. a.; Bassini, R.; u. a.; Blaich, T.; Immé, G.; u. a.; Moretto, L. G.; Schüttauf, A.; Trzcinski, A.; u. a.

  • Physical Review C 53 (1996) pp. 993-996

Permalink: https://www.hzdr.de/publications/Publ-543
Publ.-Id: 543


Theoretical study of boron nitride modifications at hydrostatic pressures

Albe, K.

This paper presents a detailed study of boron nitrides
at hydrostatic pressures. Cohesive properties of zincblende (c-BN), wurtzite
(w-BN), hexagonal (h-BN), rhombohedral (r-BN) and rocksalt structure are
calculated by systematic optimization of unit cell parameters using total-energy
DFT techniques. With focus on the very rarely discussed layered modifications
the p - V equation of states are derived. It is confirmed taht the isothermal
bulk modulus of the sp2 bonded phases is more than ten times smaller in
comparison to the dense phases. Additionally the equilibrium line of c-BN
and h-BN in the phase p, T diagram is estimated. According to recent experimental
reports c-BN is predicted as stable modification at standard conditions.

  • Physical Review B 55 (1997) 10 pp. 6203-6210

Permalink: https://www.hzdr.de/publications/Publ-542
Publ.-Id: 542


Aufnahme und Verteilung von Trichloressigsäure in Trieben Norwegischer Fichte

Uhlirova, H.; Matucha, M.; Kretzschmar, M.; Bubner, M.

  • Umweltwissenschaften und Schadstoff-Forschung: Zeitschrift für Umweltchemie und Ökotoxikologie 8 (1996) 3 pp. 138-142

Permalink: https://www.hzdr.de/publications/Publ-541
Publ.-Id: 541


Decay rates of resonance states at high level density

Persson, E.; Gorin, T.; Rotter, I.

Abstract
The time dependent Schrödinger equation of an open quantum mechanical system is solved by using the stationary bi-orthogonal eigenfunctions of the non-Hermitean time independent Hamilton operator. We calculate the decay rates at low and high level density in two different formalism. The rates are, generally, time dependent and oscillate around an average value due to the non-orthogonality of the wavefunctions. The decay law is studied disregarding the oscillations. In the one-channel case, it is proportional to t-b with b ≈ 3/2 in all cases considered, including the critical region of overlapping where the non-orthogonality of the wavefunctions is large. Starting from the shell model, we get b ≈ 2 for 2 and 4 Open decay channels and all coupling strengths to the continuum. When the closed system is described by a random matrix, b ≈ 1 + K/2 for K = 2 and 4 channels. This law holds in a limited time interval. The distribution of the widths is different in the two models when more than one channel are open. This leads to the different exponents b in the power law. Our calculations are performed with 190 and 130 states, respectively, most of them in the critical region. The theoretical results should be proven experimentally by measuring the time behaviour of de-excitation of a realistic quantum system.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-139 Preprint
    ISSN: 1436-3976
  • Physical Review E 54 (1996) 4, pp. 3339-51

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Permalink: https://www.hzdr.de/publications/Publ-540
Publ.-Id: 540


Saxon Wind Energy Ressources: Comparison of WASP and KAMM Results

Hirsch, W.; Rindelhardt, U.; Tetzlaff, G.

The wind energy ressources of a selected saxon area ( 64 km x 48 km ) has been investigated in detail. The region can be characterized by a mean height of 200 m a.s.l. with complex surface profil. Based on measuring data of three stations WASP calculations with a grid step of 0.25 km has been performed for the whole region. The data are compared with calculation results of the mesoscale KAMM model. These calculations based on the geostrophic wind data of the Czech station Prague and used a 1.0 km and a 2.5 km grid ( coresponding 60 and 120 wind clusters ). The ressource maps ( mean wind velocity and power density ) calculated by both methods show corresponding high wind potential in the investigated area. Differences in the absolute values are explained by the features of the used programmes.

  • Lecture (Conference)
    Proceedings of the 1996 European Union Wind Energy Conference and Exhibition, Göteborg (Sweden), 20.-24.5.1996, pp. 604-607

Permalink: https://www.hzdr.de/publications/Publ-539
Publ.-Id: 539


Solare Warmwasserbereitung und Fernwärmeeinspeisung -Waldblickschule Freital-

Brünig, D.; Rindelhardt, U.

In ein mit Erdgas betriebenes konventionelles Fernwärmesystem (Anschlußleistung 2,1 MW) wurde eine Solarkollektoranlage mit einer Bruttofläche von 100 m² integriert. Die Kollektoranlage diente vorrangig der Erzeugung von Brauchwarmwasser für eine Schule, solare Überschüsse wurden in den Rücklauf des Fernwärmesystems eingespeist. Ein umfangreiches Meßprogramm ermöglichte Effizienzuntersuchungen des Systems.
Der jährliche Nettoertrag des Solarsystems lag bei 280 kWh/m² bei einem Systemnutzungsgrad von 26%. Beide Kennziffern wurden durch hohe Rücklauftemperaturen (58°C) im Nahwärmenetz negativ beeinflußt. Weitere Untersuchungen galten dem Betrieb der eingesetzten Schichtspeicher (Reihenschaltung). Bei Ausschöpfung der in dem Vorhaben deutlich gewordenen Optimierungspotentiale können in künftigen Anlagen Nettoerträge von 350 kWh/m² und solare Wärmegestehungskosten unter 30 Pf./kWh erreicht werden.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-137, April 1996
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-537
Publ.-Id: 537


Electromagnetic signals from deconfined matter resulting from ultrarelativistic heavy-ion collisions

Kämpfer, B.; Peshier, A.; Hentschel, M.; Soff, G.; Pavlenko, O. P.

  • Contribution to external collection
    World Scientific, Singapore: Structure of Vacuum and Elementary Matter, World Scientific 1997, New Jersy, London, Hongkong, (Eds.) H. Stoecker, A. Gallmann, J. H. Hamilton, p. 483
  • Open Access Logo Forschungszentrum Rossendorf; FZR-136
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-536
Publ.-Id: 536


Elektroenergieerzeugung einer kombinierten Wind-Photovoltaik-Anlage in Ottendorf-Okrilla (Sachsen)

Futterschneider, H.; Hirsch, W.; Rindelhardt, U.; Teichmann, G.

Vom Zentrallager der Plus-Warenhandelsgesellschaft in Ottendorf-Okrilla (Sachsen) wird seit 1992 eine hybride Wind-Photovoltaik-Anlage zur Erzeugung von Elektroenergie betrieben. Die Anlage besteht aus einer 60-kW-Windkraftanlage des Typs TW 60 und einer Phtovoltaikanlage mit einer Spitzenleistung von 3,18 kW. Letztere zeichnet sich durch einige Besonderheiten (Orientierung des Generators, Master-Slave-Betieb der Wechselrichter) aus. Das Betriebsverhalten der Anlagen wurde über einen längeren Zeitraum untersucht.

Im Jahr 1995 erreichte die Photovoltaikanlage mit 689 Vollastbetriebsstunden etwa die Ergebnisse anderer Photovoltaikanlagen in Sachsen. Mögliche höhere Erträge werden durch die gewählte Orientierung des Generators verhindert. Die Master-Slave-Schaltung der Wechselrichter arbeitete ohne Probleme. Ihre Effektivität wurde durch die nicht optimale Abstimmung von Generator- und Wechselrichterleistung beeinträchtigt.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-138 April 1996
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-535
Publ.-Id: 535


A Neural-Network Approach for Acoustic Leak Monitoring in Pressurized Plants with Complicated Topologies

Hessel, G.; Schmitt, W.; Weiß, F.-P.

A neural-network approach has been developed for localizing leakages and estimating the leak rate in pressurized plants with complicated three-dimensional structures. Results are presented from experiments with simulated leaks at a VVER-440 reactor vessel head. As features for characterizing the occurrence and the location of a leak, RMS values of acoustic emission sensors and coherence values and power spectra of microphone signals were used. Three-layer perceptron networks were found to be best suited for leak localization and for estimation of leak rates. However, the estimation of leak rates required an additional neural network because a different normalization procedure was necessary for extracting features from the RMS values of the acoustic emission sensors. Perceptron networks with continuously valued outputs corresponding to the coordinates of the leak positions were useful for classifying even positions which had not been offered during training.

  • Control Engineering Practice, Vol. 4, No. 9, pp. 1271-1276, 1996, pp. 1271 - 1276

Permalink: https://www.hzdr.de/publications/Publ-534
Publ.-Id: 534


Institute of Nuclear and Hadron Physics; Annual Report 1995

Dönau, F.; Prade, H.; Enghardt, W.; Möller, K.; Mösner, J.; Winter, G.; Wünsch, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-130
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-533
Publ.-Id: 533


Institute of Ion Beam Physics and Materials Research; Annual Report 1995

Möller, W.; Wieser, E.; von Borany, J.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-129
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-532
Publ.-Id: 532


Lieferung von Investitionsgütern zur Erhöhung der Betriebssicherheit des Kernkraftwerkes Saporoshje - Betriebliche Überwachung, 2. Realisierungsstufe -

Beyer, M.; Carl, H.; Schikora, B.; Schumann, P.; Seidel, A.; Zschau, J.

Im Rahmen eines Programms des Bundesministeriums für Umwelt, Naturschutz und Reaktorsicherheit zur Zusammenarbeit mit den MOE-Staaten und der GUS auf dem Gebiet der kerntechnischen Sicherheit hat das Forschungszentrum Rossendorf, Institut für Sicherheitsforschung, im Verbund mit dem technischen Überwachungsverein TÜV Rheinland, Institut für Kerntechnik und Strahlenschutz, die einvernehmlich spezifizierten "technischen Mittel für ein System zur verbesserten betrieblichen Überwachung" an das Kernkraftwerk Saporoshje, Ukraine, geliefert und in Betrieb genommen. Im vorliegenden Bericht (Textteil) werden die Lieferungen und Leistungen nach Art und Umfang (Beschaffenheit, Abnahmeprüfung, Übergabe und Inbetriebnahme der technischen Mittel und die für das ukrainische Fachpersonal durchgeführten Schulungsmaßnahmen) bis zur Aufnahme des Probebetriebes am 30. November 1995 beschrieben. Dem Bericht ist ein Anhang A mit Vorschlägen zur Gestaltung der automatisch arbeitenden Überwachungssoftware und ein Anhang B mit wissenschaftsorganisatorischen Details beigefügt.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-135 April 1996
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-531
Publ.-Id: 531


The binary decay of hot heavy nuclei: fission, evaporation, and also flow?

Wagner, W.; Ortlepp, H.-G.; Gippner, P.; Herbach, C.-M.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-133 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-530
Publ.-Id: 530


Bethe-Salpeter amplitudes and static properties of the deuteron

Kaptari, L. P.; Umnikov, A. Y.; Bondarenko, S. G.; Kazakov, K. Y.; Khanna, F. C.; Kämpfer, B.

Abstract
Extended calculations of the deuteron's static properties, based on the numerical solution of the Bethe-Salpeter equation,.are presented. A formalism is developed, which provides a comparative analysis of the covariant amplitudes in various representations and nonrelativistic wave functions. The magnetic and quadrupole moments of the deuteron are calculated in the Bethe-Salpeter formalism and tlie role of relativistic corrections is discussed.

  • Physical Review C 54 (1996) 3 pp. 986-1005
  • Open Access Logo Forschungszentrum Rossendorf; FZR-134 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-529
Publ.-Id: 529


Unexpected formation of the new oxorhenium (V) complex [ReO(NH(CH2CH2S)2)(SC6H5)] obtained by N-C cleavage of the tripodal ligand N(CH2CH2SH)3

Glaser, M.; Spies, H.; Berger, R.; Hahn, F. E.; Lügger, T.; Johannsen, B.

  • Inorganica Chimica Acta 257 (1997) 143-147

Permalink: https://www.hzdr.de/publications/Publ-528
Publ.-Id: 528


Inertial Mass of the Chiral Quark-Loop Soliton in the Nambu & Jona-Lasinio Model at Finite Temperature and Density

Schleif, M.; Wünsch, R.

Abstract
We consider the mass of the one-loop hedgehog soliton of the bosonized SU(2) Nambu & Jona-Lasinio model embedded in hot nuclear matter mimiced by a gas of constituent quarks. We prove that the proper-time regularized and self-consistently determined soliton in a heat bath obeys Poincare's invariance up order V2. At ifinite temperature and chemical potential, we show that the inertial mass obtained in the perturbative pushing approach coincides with the total internal energy of the soliton.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-132 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-527
Publ.-Id: 527


Output Maximization of a 7.25 GHz ECR Ion Source

Henke, D.; Tyrroff, H.; Wirth, H.; Zschornack, G.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-131 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-526
Publ.-Id: 526


Synthesis and reactions of trigonal-bipyramidal rhenium and technetium complexes with a tripodal, tetradentate NS3 ligand*

Spies, H.; Glaser, M.; Pietzsch, H.-J.; Hahn, F. E.; Lügger, T.

  • Inorganica Chimica Acta 240 (1995) pp. 465-478

Permalink: https://www.hzdr.de/publications/Publ-525
Publ.-Id: 525


Are missing-mass measurements the key for understanding subthreshold particle production

Müller, H.

By measuring the fast particles emerging from a proton-nucleus interaction the number of participants can be determined. This might be the key quantity for understanding subthreshold particle production.

  • Zeitschrift für Physik A 355 (1996) pp. 223-224

Permalink: https://www.hzdr.de/publications/Publ-524
Publ.-Id: 524


Comment on "Evidence of enhanced epitaxial crystallization at ion temperature by inelastic electronic scattering of mega-electronvolt heavy-ion-beam irradiation"

Heera, V.

The results on epitaxial crystallization of Si by mega-electron-volt heavy-ion-beam irradiation recently published by Nakata can be understood in the framework of the "point defect diffusion model". It is not necessary to consider inelastic electronic scattering effects in order to explain the decrease in the normalized crystallization rate with increasing nuclear deposited energy.

  • Journal of Applied Physics (short communication) 80 (1996) 4235

Permalink: https://www.hzdr.de/publications/Publ-523
Publ.-Id: 523


A Neutron Double-Crystal Diffractometer with a Position Sensitive Detector for Small-Angle Scattering Studies

Hempel, A.; Eichhorn, F.; Reichel, P.; Boede, W.

A neutron double-crystal diffractometer (DCD) with a position sensitive detector for a simultaneous measurement of the whole scattering range was realized. In this arrangement the angular dependence of the intensity distribution is transformed into a positional one by an elastically bent perfect analyzer (second) crystal set in a completely asymmetric diffraction geometry. The DCD may be used for the study of neutron beams scattered, diffracted, refracted or reflected in small angles. By tuning the curvature of the analyzer in the momentum transfer a range from 2x10-1 nm-1 is available. At present this DCD is used for small-angle neutron scattering investigations as well as for experiments with neutron optical components.

  • Nuclear Instruments and Methods in Physics Research A 381 (1996) pp. 466-471

Permalink: https://www.hzdr.de/publications/Publ-521
Publ.-Id: 521


SAXS Investigation of Structural Changes in the Plastic Zone Ahead of the Crack Tip in Ductile Metals

Große, M.; Böhmert, J.; Hempel, A.; Riekel, C.; Engstroem, P.

  • Poster
    ESRF-User-Meeting 1995, Grenoble 20.-21.11.1995

Permalink: https://www.hzdr.de/publications/Publ-520
Publ.-Id: 520


Einfluß bestrahlungsindizierter Ausscheidungen auf die Zähigkeit von Cr-Mo-V-legierten Reaktordruckbehälterstählen

Böhmert, J.; Große, M.; Viehrig, H.-W.

  • Contribution to proceedings
    28. Tagung DVM-Arbeitskreises Bruchvorgänge, Bremen, 26. - 27. Februar 1996, DVM-Bericht 228, S. 173 - 182

Permalink: https://www.hzdr.de/publications/Publ-519
Publ.-Id: 519


Institute of Safety Research, Annual Report 1994

Weiß, F.-P.; Rindelhardt, U.; (Editors)

The report gives an overview on the scientific work of the Institute of Safety Research in 1994.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-126 Juni 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-517
Publ.-Id: 517


The Temperature Dependence of the Ion Beam Induced Interfacial Amorphization in Silicon

Henkel, T.; Heera, V.; Kögler, R.; Skorupa, W.; Seibt, M.

The temperature dependence of the ion beam induced interfacial amorphization process (IBIIA) in silicon has been investigated at temperatures above 80 K using Rutherford Backscattering Spectroscopy/Channeling (RBS/C) and Cross-Sectional Transmission Electron Microscopy (XTEM). Three regimes are observed. Above temperatures of about 320 K there is strong temperature dependence of the IBIIA rate (thermal regime). At lower temperatures the rate moves towards a saturation value (transition regime). Below approximately 150 K IBIIA is nearly temperature independent (ballistic regime). This low temperataure regime can be explained by an athermal transport of point defects like in ballistic mixing processes.

  • Applied Physics Letters 68 (1996) 24 pp. 34253427

Permalink: https://www.hzdr.de/publications/Publ-513
Publ.-Id: 513


Herstellung, Charakterisierung und Ionenstrahlmodofizierung amopher Kohlenstoffschichten

Kolitsch, A.; Ullmann, J.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-127
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-512
Publ.-Id: 512


Institute of Radiochemistry; Annual Report 1995

Nitsche, H.; Engelmann, H.-J.; Bernhard, G.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-123
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-511
Publ.-Id: 511


Parallele Erfassung und Übertragung nicht synchronisierter Datenströme aus mehreren Echtzeitrechnern

Schikora, B.; Zschau, J.

  • Lecture (Conference)
    bei der Firma PEP Modular Computers GmbH, Dresden, 27.06.1996

Permalink: https://www.hzdr.de/publications/Publ-510
Publ.-Id: 510


Estimates of Electromagnetic Signals from Deconfined Matter Produced in Ultrarelativistic Heavy-Ion Collisions

Kämpfer, B.; Pavlenko, O. P.; Peshier, A.; Hentschel, M.; Soff, G.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-128
    ISSN: 1436-3976
  • Book (Authorship)
    Advances in Nuclear Dynamics 2, Edited by Bauer and Westfall, Plenum Press, New York, 1996, p. 285

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Permalink: https://www.hzdr.de/publications/Publ-509
Publ.-Id: 509


Surface Light Scattering Spectroscopy of the Gallium Liquid-Vapor Interface

Kolevzon, V.

Surface Light Scattering Spectroscopy of the Gallium Liquid-Vapor Interface
Vladimir Kolevzon
Abstract
High frequency capillary waves at liquid Ga surface have been studied by means of quasielastic light scattering spectroscopy. The observed frequencies and damping constants of waves differed greatly from classical theoretical treatment of liquid Ga surface as that of a simple liquid. This effect was explained due to the presence of the surface layer, possessing visco-elastic properties extracted, for the first time, from the fit of experimental spectra with an appropriate theoretical form. Negative value of the surface dilational viscosity has been derived for all wavenumbers studied. At high wavenumbers q the wave dispersion behavior is best likely linked to the weak coupling between dilational and capillary modes, while at low and moderate q the experimental data resemble to the mixed oscillations. This behavior is consistent with an influence of diffusion and adsorption on the waves propagation.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-124
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-508
Publ.-Id: 508


Institute of Bioinorganic and Radiopharmaceutical Chemistry; Annual Report 1995

Johannsen, B.; Seifert, S.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-122
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-507
Publ.-Id: 507


A Neural Network Approach for Acoustic Leak Monitoring at Pressurized Plants with Complicated Topology

Hessel, G.; Schmitt, W.; Weiß, F.-P.

  • Contribution to proceedings
    Preprints of the IFAC Workshop on On-line Fault Detection and Supervision in the Chemical Process Industries, Newcastle (England), June 12 - 13th 1995, pp. 98 - 102

Permalink: https://www.hzdr.de/publications/Publ-505
Publ.-Id: 505


OS/9-Anwendungen zur parallelen Erfassung nichtsynchronisierter Datenströme aus mehreren Echtzeitrechnern

Schikora, B.; Zschau, J.; Wiedemann, H.

  • Lecture (Conference)
    OS/9-Konferenz, 20.-22.9.1996 in Emmetten/Schwiz

Permalink: https://www.hzdr.de/publications/Publ-504
Publ.-Id: 504


Phase identification of boron nitride thin films by polarized infrared reflection spectroscopy

Plass, M.; Fukarek, W.; Mändl, S.; Möller, W.

Six different types of boron nitride films were investigated by polarized infrared reflection spectroscopy. Films with a highly cubic, mixed cubic and non-cubic, and exclusively non-cubic phase composition were synthesized using ion beam assisted deposition. Additionally, post-deposition argon ion irradiated cubic and non-cubic boron nitride films as well as nitrogen implanted boron sample were analyzed. Using this technique, besides the cubic phase, two different non-cubic modifications, layered anisotropic and amorphous, could be distinguished. A preferentional orientation of the normal axis of the sp2-bonded basal planes parallel to the substrate surface was observed.

  • Applied Physics Letters 69 (1996) 1 pp. 46-48

Permalink: https://www.hzdr.de/publications/Publ-503
Publ.-Id: 503


Technetium and rhenium complexes of mercaptoacetyl glycine ligands 2. Formation and molecular structure of Re(V) complexes with mercaptoacetyl glycine and mercaptoacetyl glycine ethylester

Noll, B.; Noll, S.; Leibnitz, P.; Spies, H.; Schulze, P. E.; Semmler, W.; Johannsen, B.

  • Inorganica Chimica Acta 255 (1997) 399-403

Permalink: https://www.hzdr.de/publications/Publ-502
Publ.-Id: 502


Nodales Modell zur Berechnung des Neutronenflußrausches infolge zufälliger Regelelementschwingungen in WWER-440 Reaktoren

Hollstein, F.

  • Lecture (Conference)
    und Proceedings zur Jahrestagung "Kerntechnik '96", Mannheim, 21.-23.5.1996

Permalink: https://www.hzdr.de/publications/Publ-501
Publ.-Id: 501


40-kWp-Potovoltaikanlage Kirnitzschtalbahn

Brockmann, R.; Henkel, R.; Rindelhardt, U.

Die 40-kWp-Photovoltaikanlage ist die größte netzgekoppelte PV-Anlage in Sachsen. Trotz nichtoptimaler Lage (Abschattungen im Winter) erreichte die Anlage im Jahr 1995 einen Ertrag von fast 700 kWh/kWp und liegt damit im Durchschnitt der Erträge anderer sächsischer Anlagen. Bewährt hat sich die Master-Slave-Schaltung der Wechselrichter. Der Strombedarf der Kirntzschtalbahn wird durch die Anlage zu knapp 30% gedeckt.

  • Lecture (Conference)
    11. Symposium Photovolterische Solarenergie, 13.-15.3.1996, Staffelstein, Tagungsband S. 289-293
  • Contribution to proceedings
    11. Symposium Photovolterische Solarenergie, 13.-15.3.1996, Staffelstein, Tagungsband S. 289-293

Permalink: https://www.hzdr.de/publications/Publ-500
Publ.-Id: 500


Betriebsverhalten von netzgekoppelten Photovoltaikanlagen aus dem 1000-Dächer-Programm

Ihle, T.; Rindelhardt, U.; Teichmann, G.

Durch das FZR werden an 50 PV-Anlagen in Sachsen mehrjährige Untersuchungen zum Betriebsverhalten durchgeführt. Das Untersuchungsprogramm umfaßt die technische Überprüfung des Anlagenzustandes und die Messung der Kennlinien des PV-Generators und der eingesetzten Wechselrichter. Ferner erfolgt eine monatliche Analyse der erreichten Energieerträge. Die ersten Ergebnisse dieser Untersuchungen sind im Beitrag zusammengefaßt.

  • Lecture (Conference)
    11. Symposium Photovolterische Solarenergie, 13.-15.3.1996, Staffelstein, Tagungsband S. 294-298
  • Contribution to proceedings
    11. Symposium Photovolterische Solarenergie, 13.-15.3.1996, Staffelstein, Tagungsband S. 294-298

Permalink: https://www.hzdr.de/publications/Publ-499
Publ.-Id: 499


A Fast and Precise Generating Voltmeter

Bürger, W.

  • Contribution to external collection
    9th Int. Symp. on High Voltage Engineering, Graz, 1995

Permalink: https://www.hzdr.de/publications/Publ-497
Publ.-Id: 497


Investigations of ion implanted iron silicide layers after annealing and irradiation

Dobler, M.; Reuther, H.; Betzl, M.; Mäder, M.; Möller, W.

  • Nuclear Instruments and Methods in Physics Research B 117 (1996) pp.117-122

Permalink: https://www.hzdr.de/publications/Publ-496
Publ.-Id: 496


Aufbau und Optimierung einer Hochfrequenzübertragungsstrecke mittels Glasfaserkabel zur phasenstarren Synchronisierung verschiedener 1,3GHz-HF-Systeme eines Beschleunigers

Scheurer, S.

  • Other report
    Diplomarbeit, Hochschule für Technik und Wirtschaft (FH) Dresden/Sa.

Permalink: https://www.hzdr.de/publications/Publ-495
Publ.-Id: 495


Ein technisches Informationssystem zur verbesserten betrieblichen Überwachung des Kernkraftwerkes Saporoshje/Ukraine

Beyer, M.; Carl, H.; Schikora, B.; Schumann, P.; Seidel, A.; Weiß, F.-P.; Zschau, J.; Nowak, K.; Tolksdorf, P.

In order to improve the operational surveillance of a VVER-1000 unit of the Ukrainian nuclear power plant Zaporosh´ye a technical monitoring system has been specified. The system will enable the state regulatory and supervisory bodies to survey the unit operation independently of operators to assess its safety status, and to impose appropriate conditions. Due to its up-to-date configuration the system provides early indication of any operational incident and emission of radioactive materials connected. Based on the system an immediate warning in mergency situations is possible as well as an effective emergency management. For this purpose 49 different operational parameters of the unit, 18 radiological parameters of the unit and the plant site and 6 meteorological parameters are monitored.
The monitoring concept and its technical realization are described.

  • Lecture (Conference)
    Postervortrag zum 4. Kolloquium Technische Diagnostik, TU Dresden, 14./15. März 1996
  • Open Access Logo Forschungszentrum Rossendorf; FZR-171 März 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-494
Publ.-Id: 494


Simulation of a Small Cold Leg Break Experiment on PMK-2 Test Facility using the codes RELAP5 and ATHLET

Prasser, H.-M.; Schäfer, F.; Krepper, E.; Ézsöl, G.; Guba, A.; Perneczky, L.

Results of a small break loss of coolant accident experiment, conducted on the PMK-2 integral type test facility are presented. The experiment simulated a 1% break in the cold leg of a VVER-440-type reactor. The main phenomena of the experiment are discussed and in case of selected events a more detailed interpretation with the help of measured void fraction, obtained by a special measurement device is given. Two thermohydraulic computer codes, RELAP5 and ATHLET, are used for post test calculations. The aim of the presented calculations is to investigate the code capability for modeling natural circulation phenomena in VVER-440-type reactors. Therefore the results of the experiment and both calculations are compared. Both codes predict most of the transient events well, with the exception that RELAP5 fails to predict the dry-out-period in the core. In the experiment the hot and cold leg loop seal clearing is accompanied by natural circulation instabilities, which can be explained by means of the ATHLET calculation.

  • Nuclear Technology Vol. 118, May 1997, pp. 162-174

Permalink: https://www.hzdr.de/publications/Publ-493
Publ.-Id: 493


Ultrasonic Time-of-Flight Diffraction Method for Monitoring Stable Crack Growth

Bergmann, U.; Bergner, F.; Langenberg, K. J.; Hofmann, C.

  • Lecture (Conference)
    14th World Conference on Nondestructive Testing, Neu Delhi, December 8 - 13, 1996, Beitrag zu Sammelwerken: Proc. of the 14th World Conference on NDT, New Delhi, 1996, pp. 2325
  • Contribution to proceedings
    14th World Conference on Nondestructive Testing, Neu Delhi, December 8 - 13, 1996, Beitrag zu Sammelwerken: Proc. of the 14th World Conference on NDT, New Delhi, 1996, pp. 2325

Permalink: https://www.hzdr.de/publications/Publ-492
Publ.-Id: 492


Application of the Guiding Centre Approximation to the Transport of Injected Fast Ions in a Mirror Based Plasma Neutron Source

Kumpf, H.; Noack, K.

Abstract
The guiding centre appraximation for the motion of charged particles in axially symmetric magnetic and electric fields is formulated and stopping as well as small angle scattering on a multicompenent plasma are included. The developed code has been applied to the design of a 14-MeV neutron source according to the concept of the Budker Institute Novosibirsk. It is demonstrated that the self-interaction of injected D and T ions by stopping, scattering and induced internal Fields has to be taken into account, if the injected power exceeds a few megawatt.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-121 1996
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-491
Publ.-Id: 491


A 100 kV 10 A high-voltage pulse generator for plasma immersion ion implantation

Brutscher, J.

The design of a high voltage pulsing system for a plasma immersion ion implantation (PIII) facility is presented. A list of requirements, which have to be fulfilled by a high voltage pulse generator to get best results and a optimum operation of the PIII system, is given. A simple electrical model of the plasma is presented which describes the plasma as a capacitive-resistive load. The model parameters are determined to fit experimental results. The requirements for the pulse generator can be fulfilled well using a pulse generator design which employs a hard tube switch. A pulse generator design is presented which is especially optimized for PIII systems. Especially the hard tube control is optimized for obtaining voltage rise times as short as possible.

Comments or further questions to: brutscher@fz-rossendorf.de

  • Review of Scientific Instruments 67 (1996) 7 pp. 2621-2625

Permalink: https://www.hzdr.de/publications/Publ-490
Publ.-Id: 490


Influence of the depth position on the neutron embrittlement of the VVER reactor pressure vessel steel 15Cr2MoV(A) Consequences for the assessment of reactor safety

Böhmert, J.; Gosse, H.-W.; Viehrig, H.-W.; Bergner, F.

The dependence of the mechanical properties on the depth position in the unirradiated state and after irradiation up to neutron fluences of approximately 5x1018 and 70x1018 cm-2 (E > 0.5 MeV) is tested on a forging made out of VVER 440 reactor pressure vessel (RPV) steel 15CrMoV. The near-surface position shows a higher strength and a lower transition temperature than the positions greater than 1/4 wall thickness. Irradiation does not change these differences in a significant manner. The testing of specimens from the 1/4 depth position withi the surveillance programme, as normally laid down in the legal rules relating to nuclear power plants, results in a conservative safety assessment against brittle failure up to the EOL fluence. On taking into account fluence attenuation, the flux effect, etc., the toughness gradually increases from the inside to the outside of the wall after longer RPV operating times.

  • Nuclear Engineering and Design 159 (1995) pp. 131-141

Permalink: https://www.hzdr.de/publications/Publ-489
Publ.-Id: 489


Sources of radiochemical impurities in the ...

Noll, B.; Johannsen, B.; Spies, H.

  • Nuclear Medicine and Biology 22 (1995) 8 pp. 1057-1062

Permalink: https://www.hzdr.de/publications/Publ-488
Publ.-Id: 488


Fernüberwachung ukrainischer Kernkraftwerke

Beyer, M.; Carl, H.; Schikora, B.; Schumann, P.; Zschau, J.; Nowak, K.; Tolksdorf, P.

Zur Verbesserung der betrieblichen Überwachung eines WWER-1000-Reaktors im ukrainischen Kernkraftwerk Saporoshje wurde ein technisches Informationssystem entworfen. Dieses System soll die Staatliche Aufsichtsbehörde in die Lage versetzen, den Reaktorbetrieb unabhängig vom Betreiber zu beobachten, den Sicherheitszustand der Anlage zu erfassen und nötigenfalls Auflagen zu erteilen. Durch eine moderne Ausrüstung soll das System eine Früherkennung von betrieblichen Störungen und Unfällen sowie der damit verbundenen Emission radioaktiver Substanzen ermöglichen. Auf dieser Grundlage soll sowohl eine rechtzeitige Warnung als auch ein effektives Störfall-Management möglich werden. Zu diesem Zweck werden 49 betriebliche Parameter, 18 radiologische Parameter und 6 meteorologische Parameter kontinuierlich überwacht. Das Überwachungskonzept und die technische Realisierung werden vorgestellt.

  • Contribution to proceedings
    Jahrestagung Kerntechnik '96, Mannheim, 21. - 23. Mai 1996, Tagungsbericht S. 476 - 479

Permalink: https://www.hzdr.de/publications/Publ-486
Publ.-Id: 486


Methodische Untersuchungen und Testmessungen für das pp-Bremsstrahlungsexperiment am COSY-TOF-Spektrometer

Schülke, A.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-120
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-483
Publ.-Id: 483


An explanation of trap-limited self-interstitial diffusion and enhanced boron clustering in boron doped silicon superlattices

Jäger, H.-U.

Boron doped crystalline superlattices grown by low-temperature molecular beam epitaxy have been used by Stolk et al. to study the diffusion of self-interstitials I in Si. After 40 keV Si+ ion implantation and subsequent annealing, stationary interstitial profiles are found at 670 °C for periods t ~1 h, demonstrating that the penetration depth of interstitials is limited by trapping at hitherto unidentified impurities. In addition, the high
interstitial supersaturation causes B de-activation in the near-surface region. We show that both these effects, the trap-limited interstitial diffusion and the enhanced B clustering, can be explained, if the transient de-activation of boron is modeled by the first-order reaction I + B_s ->B_i. Boron atomic and electrical profiles as well as self-interstitial profiles are computed which are in good agreement with the experimental results.

  • Lecture (Conference)
    Proceedings of the Fourth International Symposium on Process Physics and Modeling in Semiconductor Technology, edited by G. R. Srinivasan, C. S. Murthy and S. T. Dunham, pp. 210-215
  • Contribution to proceedings
    Proceedings of the Fourth International Symposium on Process Physics and Modeling in Semiconductor Technology, edited by G. R. Srinivasan, C. S. Murthy and S. T. Dunham, pp. 210-215

Permalink: https://www.hzdr.de/publications/Publ-482
Publ.-Id: 482


CEMS and AES Investigations on Iron Silicides

Reuther, H.; Dobler, M.

  • Surface and Interface Analysis 24 (1996) pp. 411-415

Permalink: https://www.hzdr.de/publications/Publ-481
Publ.-Id: 481


Berücksichtigung der Zusatzsteifigkeit aus der Verdrängung einer axialen Ringspaltströmung bei Kernbehälter- und Kernmantelschwingungen

Altstadt, E.; Grunwald, G.; Zimmermann, W.; Zoller, J.

  • Lecture (Conference)
    Jahrestagung Kerntechnik '96
  • Contribution to proceedings
    Jahrestagung Kerntechnik 1996

Permalink: https://www.hzdr.de/publications/Publ-479
Publ.-Id: 479


Resonance phenomena near thresholds

Persson, E.; Müller, M.; Rotter, I.

Abstract
The trapping effect is investigated close to the elastic threshold. The nucleus is described as an Open quantum mechanical many-body system embedded in the continuum of decay channels. An ensemble of compound nucleus states with both discrete and resonance states is investigated in an energy-dependent formalism. It is shown that the discrete states can trap the resonance ones and also that the discrete states can directly influence the scattering cross section.

  • Physical Review C 53, (1996), 3002-3008
  • Open Access Logo Forschungszentrum Rossendorf; FZR-119 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-478
Publ.-Id: 478


The reaction NN -> NNgamma in the 1 GeV region within an effective one-boson exchange model

Titov, A. I.; Kämpfer, B.; Reznik, B. L.; Shklyar, V.

Abstract
Within an effective one- boson exchange parametrization of the T matrix of NN interactions we calculate cross sections for the reactions pp → ppγ and pn → pnγ for proton incidence energies in the order of 1 GeV. Besides bremsstrahlung processes we consider photons from ∆ decays and contributions from the η → γγ process, where the η is excited via the N1535 resonance. At beam energies above 700 MeV the ∆ decay channiel dsminates for large photon energies, while above the η threshold the η decay photons ähsw up only in a narrow window. The low energy photons stem frorn pure bremsstrahlunig processes.

  • Physics Letters B 372 (1996) pp. 15-19
  • Open Access Logo Forschungszentrum Rossendorf; FZR-118 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-477
Publ.-Id: 477


Contribution of the massive photon decay channel to the neutrino cooling of neutron stars

Voskresensky, D. N.; Kolomeitsev, E. E.; Kämpfer, B.

Abstract

The role of the massive photon decay via intermediate states of electron-electron-holes and proton-proton-holes into neutrino-anti-neutrino pairs in the course of neutron star cooling is investigated. These reactions may ba operative in hot neutron stars in the region of proton pairing. The corresponding contribution to the neutrino emissivity is calculated. It varies with the temperature as T3/2e−mγ/T for T < m γ, where mγ is an effective photon mass in superconducting matter. Estimates show that this process appears as strong cooling channel of neutron stars at temperatures T ≈ ( 109 - 1010) K.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-117 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-476
Publ.-Id: 476


Langzeitmeßprogramm "1000-Dächer-Programm"

Rindelhardt, U.; Teichmann, G.

Die technische Überprüfung von bisher 30 netzgekoppelten Anlagen ergab keine gravierenden Mängel. Einzelne technische Schwächen von eingesetzten Komponenten wurden identifiziert. Zur energetischen Bewertung der Anlagen wurde ein PC-gestützter PV-Anlagen-Analysator entwickelt und erprobt. Ein optimales Verfahren zur Umrechnung gemessener PV-Generator-Kennlinie auf STC-Bedingungen existiert noch nicht.

  • Lecture (Conference)
    BMBF-Statusseminar "Photovoltaik", Bad Breisig, 23.-25. April 1996, Berichtsband, Beitrag Nr. 73
  • Contribution to proceedings
    BMBF-Statusseminar "Photovoltaik", Bad Breisig, 23.-25. April 1996, Berichtsband, Beitrag Nr. 73

Permalink: https://www.hzdr.de/publications/Publ-475
Publ.-Id: 475


Observation of ferroelastic domain effects at a study of Low-Temperatur Phase Transitions in Sr0.7Ba0.3Nb2O6

Prokert, F.; Savenko, B. N.; Balagurov, A. M.

  • Contribution to proceedings
    Abtract ISFD 4, Int. Symposium on Ferroic Domains and Mesoscopie Structures, Vienna 25.-30.3.1996

Permalink: https://www.hzdr.de/publications/Publ-474
Publ.-Id: 474


Channeling Radiation and Parametric X-Radiation at Electron Energies below 10 MeV

Freudenberger, J.; Genz, H.; Groening, L.; Hoffmann-Stascheck, P.; Knüpfer, W.; Morokhovskii, V. L.; Morokhovskii, V. V.; Nething, U.; Richter, A.; Sellschop, J. P. F.

  • Nuclear Instruments and Methods in Physics Research B 119 (1996) pp. 123-130

Permalink: https://www.hzdr.de/publications/Publ-473
Publ.-Id: 473


Channeling radiation of electrons in natural diamond crystals and their coherence and occupation lengths

Nething, U.; Genz, H.; Groening, L.; Hoffmann-Stascheck, P.; Richter, A.; Hormes, J.; Höfer, M.; Sellschop, J. P. F.; Toepffer, C.; Weber, M.

  • Physical Review B Condensed Matter 53 (1996) 14 pp. 8922-8936

Permalink: https://www.hzdr.de/publications/Publ-472
Publ.-Id: 472


Experimental determination of the linewidth of parametric X-ray radiation at electron energies below 10 MeV

Freudenberger, J.; Galemann, M.; Genz, H.; u. a.; Morokhovskii, V. L.; Nething, U.; Prade, H.; Zahn, R.; Sellschop, J. P. F.

  • Nuclear Instruments and Methods in Physics Research B 115 (1996) pp. 408-410

Permalink: https://www.hzdr.de/publications/Publ-471
Publ.-Id: 471


The Code DYN3DR for Steady-State and Transient Analyses of Light Water Reactor Cores with Rectangular Geometry

Grundmann, U.

The code DYN3D/M2 was developed for steady-state and transient analysis of reactor cores with hexagonal fuel assemblies. The new version DYN3DR contains a method for neutron kinetics solving the two group neutron diffusion equation by a nodal method for cartesian geometry. The thermal-hydraulic model FLOCAL simulating the two phase flow of coolant and the fuel rod hehaviour is used in the two versions. The fundamentals of the neutron kinetics are described. The accuracy of the code is demonstated by comparisons with the results of rod ejection benchmarks for PWR with rectangular fuel assemblies. The developed algorithm of neutron kinetics are suitable for using parallel processing. The speedup of neutronic calculation is demonstrated for a steady state solution of diffusion equation.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-114 November 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-470
Publ.-Id: 470


Nachuntersuchungen an Reaktordruckbehältern des stillgelegten KKWs Greifswald - eine Chance zur realistischen Bewertung der Neutronenversprödung

Böhmert, J.; Törrönen, K.; Valo, M.

  • Lecture (Conference)
    Jahrestagung Kerntechnik 1996
  • Contribution to proceedings
    Jahrestagung Kerntechnik '96, Mannheim, 21. - 23. Mai 1996, Tagungsbericht S. 176 -179

Permalink: https://www.hzdr.de/publications/Publ-469
Publ.-Id: 469


Asymmetry of the Dielectron Emission Rate in an Isospin-Asymmetric Pion Medium

Kämpfer, B.; Gumalov, T. I.; Titov, A. I.

Asymmetry of the Dielectron Emission Rate in an
Isospin-Asymrnetric Pion Medium
T.I. GULANOVA,1 A. I. TITOV
Bogoliubov Theoretical Laboratory, Joint Institute for Nuclear Research,
141980 Dubna, Russia
B. Kämpfer
Research Center Rossendorf, Institute for Nuclear and Hadron Physics,
PF 510119, 01314 Dresden, Germany
Institute for Theoretical Physics, Technical University Dresden,
Mommsenstr. 13, 01062 Dresden, Germany

Abstract

The dielectron emission by pion annihilation in an isospin-asymmetric pion gas at finite temperature is considered. Due to the differente between the longitudinal and tramverse parts of the in-medium p meson self-energy a specific asymmetry of the rates is caused for electron pairs with relative momenta perpendicular or parallel to the total pair momentum. This asymmetry may be considered as a sensitive signal of in-medium-modifications of the p properties.
1Permanent- address: Physical and Technical Institute of Uzbek Academy of Sciences, 700084 Tashkent,
RepubIic Uzbekistan

  • Physics Letters B 372 (1996) pp. 187-192
  • Open Access Logo Forschungszentrum Rossendorf; FZR-113 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-467
Publ.-Id: 467


Erweitertes Überwachungsprogramm der Strahlenversprödung durch Probenrekonstitution

Viehrig, H.-W.; Böhmert, J.

  • Lecture (Conference)
    Jahrestagung Kerntechnik 1996, Mannheim, 1996, Tagungsbericht, S. 172 ff.
  • Contribution to proceedings
    Jahrestagung Kerntechnik 1996, Mannheim, 1996, Tagungsbericht, S. 172 ff.

Permalink: https://www.hzdr.de/publications/Publ-466
Publ.-Id: 466


Bericht der Herbsttagung der Studiengruppe für Elektronische Instrumentierung vom 2. bis 4. Oktober 1995 in Graz

Gabriel, F.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-116
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-465
Publ.-Id: 465


Ionenstrahlsynthese von Nanoclustern

Schmidt, B.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-115
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-464
Publ.-Id: 464


Diffuse scattering of neutrons in thermally oxidized silicon

Eichhorn, F.; Podurets, K. M.; Shilstein, S. S.

  • Physica B 229 (1997) pp. 128-132

Permalink: https://www.hzdr.de/publications/Publ-463
Publ.-Id: 463


Berechnung von Neutronenflußdichteschwankungen in WWER-Druckwasserreaktoren infolge strömungsinduzierter Schwingungen

Hollstein, F.

Zusammenfassung
Dargestellt wird ein in sich geschlossenes 3D-Modell zur Berechnung der ortsabhängigen Übertragungsfunktionen für stochastische Schwingungen der Regel- und Brennelemente in Reaktoren vom Typ WWER-440 unter Berücksichtigung der heterogenen Brennstoffbeladung realer Spaltzonenkonfigurationen. Basis sind die nodalen Bilanz-Gleichungen zur Berechnung der stationären Neutronediußverteilung in der Eingruppen-Diffusionsnäherung für 3D-Nodes in Hexagonal-Z-Geometrie. Die Absorberteiie eines WWER- 440-Regelelements werden durch entsprechende Randbedingungen für die Diffusionsgleichun im neutronenphysikalischen Reaktormodell erfaßt. Die Modellierung der Rauschquellen erfolgt auf der Grundlage einer Sweigruppen-Diffusionsnäherung. Die Neutronenflußdichteschwankungen werden dabei durch Störungen bei der Kickstreuung thermischer Neuttonen in "Absorber-Nodes" bzw. durch stochastische Schwankungen der Zweigruppen-Wirkungsquerschiiitte an den radialen Nodegrenzen der 'Brennstoff-Nodes" beschrieben. Zur Berechnung der Ubertragungsfunktionen für die Schwankungen der Neutronenflußdichte werden die nodalen Bilanz-Gleichungen in der Prompt-Response-Approximation verwendet. Die Kopplung der Zweigruppen-Quellmodeiie für Brennstoff- und Absorberteil eines Regelelements an das nodale Eingruppen-Übertragungsmodel erfolgt im Sinne der modifizierten Eingruppen-Diffussionsnäherung.
Anhand numerischer Berechnungen werden wesentliche Charakteristika der Übertragungsfunktionen für
Regelelementschwingungen in Dwckwasserreaktoren vom Typ WWER-440 diskutiert.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-110 September 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-462
Publ.-Id: 462


Dielektrische Theorie des elektronischen Energieverlustes schwerer Ionen in Festkörpern

Mathar, R. J.

  • Other report
    Dissertation

Permalink: https://www.hzdr.de/publications/Publ-461
Publ.-Id: 461


Through-Thickness Characterization of Mechanical Properties of Russian VVER-Type and ASTM-Type Reactor Pressure Vessel Steel Forgings

Viehrig, H.-W.; Böhmert, J.; Große, M.

  • Lecture (Conference)
    und Proceedings IAEA Specialists Meeting "Neutron Embrittlement and Mitigation" vom 23.-26. Oktober 1995 in Espoo, Finnland, Proc. IWG-LMNPP-95/5, Vol. II, Session 4, paper 3

Permalink: https://www.hzdr.de/publications/Publ-460
Publ.-Id: 460


PV COVERS ELECTRICITY DEMAND How private users of 200 PV systems Match their energy consumption to the PV production

Jahn, U.; Tegtmeyer, D.; Rindelhardt, U.; Teichmann, G.

The German 1000 roofs PV programme, in which more than 2000 roof-mounted grid connected PV systems are now operating, provides invaluable information on the operational performance of the installed PV systems, the PV users and their consumption behaviour. The Institut für Solarenergieforschung (ISFH) and the Forschungszentrum Rossendorf (FZR), responsible for the organization of the 1000 roofs programme in the Federal States of Lower Saxony and Saxony, have been analysing the monitored performance and consumption data of more than 300 PV systems operating since 1991. The purpose of this work is to examine the relationship between PV system yield and electricity consumption for the realized projects and to take advantage of the first-hand information on the PV users consumption behaviour for future PV applications.

  • Lecture (Conference)
    Proceedings of the 13. European Photovoltaic Solar Energy Conference, Nice (France), 23.-27.10.1995, Volume II, p. 2247

Permalink: https://www.hzdr.de/publications/Publ-459
Publ.-Id: 459


Theoretische Modellierung des Druckbehälters und der Druckbehältereinbauten eines Siedewasserreaktors (SWR)

Altstadt, E.; Scheffler, M.; Weiß, F.-P.

  • Other report
    Institutsbericht

Permalink: https://www.hzdr.de/publications/Publ-457
Publ.-Id: 457


High-affinity binding of [3H]paroxetine to caudate nucleus and microvessels from porcine brain

Brust, P.; Bergmann, R.; Johannsen, B.

  • NeuroReport 7 (1996) pp. 1405-1408

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Permalink: https://www.hzdr.de/publications/Publ-456
Publ.-Id: 456


Ion Beam Surface Treatment of Biomaterials

Pham, T.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-112
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-455
Publ.-Id: 455


Optimization on Rugged Landscapes: A Democratic Approach

Dittes, F.-M.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-92 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-454
Publ.-Id: 454


Improvement of the Mechanical Surface Properties of Aluminium by High Dose Oxygen Implantation

Wieser, E.; Reuther, H.; Richter, E.

  • Nuclear Instruments and Methods in Physics Research B 111 (1996) pp. 271-280

Permalink: https://www.hzdr.de/publications/Publ-453
Publ.-Id: 453


Projektabwicklung und Ergebnisse des Bund-Länder-1000-Dächer-Photovoltaik-Programmes in Sachsen

Rindelhardt, U.; Teichmann, G.; Lang, D.

Im Report werden die im Rahmen des Bund-Länder-1000-Dächer-Photovoltaik-Programmes in Sachsen erzielten Ergebnisse dargestellt. Insgesamt wurden auf Dächern von Ein- und Zweifamilienhäusern in den Jahren 1992 - 1994 150 netzgekoppelte Anlagen mit einer Gesamtleistung von 523 kWp errichtet. Dabei kamen Module und Wechselrichter von jeweils acht verschiedenen europäischen Herstellern zum Einsatz. Die beteiligten Fachfirmen erwarben ein breites Know-how zur Auslegung und Installation der Anlagen sowie zur architektonischen und bautechnischen Einbindung der Photovoltaikgeneratoren auf Dächern von Einfamilienhäusern. Entsprechende Ergebnisse werden zusammenfassend vorgestellt.
Die Ergebnisse des begleitenden Meßprogrammes werden im Detail diskutiert. Erstmals werden quantitative Zusammenhänge zwischen der solaren Energieproduktion und dem Eigenbedarf von Haushalten ermittelt. Der jährliche Elektroenergiebedarf von Haushalten kann durch dachmontierte PV-Anlagen unter mitteleuropäischen Bedingungen voll gedeckt werden. Die mögliche jährliche Energieproduktion einer Photovoltaikanlage in Sachsen beträgt 750 kWh/kWp, die weitere Minimierung der anlagenbedingten Verluste ist Gegenstand weiterführender Untersuchungen.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-109, September 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-452
Publ.-Id: 452


Shell-Model Study of Shears Bands in Light Pb Nuclei

Frauendorf, S.; Reif, J.; Winter, G.

Spherical shell-model calculations have been performed in the configuration space ( s1/2h9/2i13/2)
and (p1/2p3/2f5/2i13/2) for protons and neutrons, respectively, in order to interpret the sequences of strong dipole transitions found in neutron-deficient Pb isotopes. Regular dipole bands are found if several high-j protons and high-j neutron holes are interacting with neutrons in the low-spin (fp) orbitals. The calculated B(M1) values are in the order of several µN 2
for the deltaJ=1 transitions, and the crossover E2 transitions are very weak. The mechanism generating the dipole bands is found to be the same as in the tilted axis cranking mean-field description.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-107 Preprint
    ISSN: 1436-3976
  • Nuclear Physics A 601 (1996) pp. 41-55

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Permalink: https://www.hzdr.de/publications/Publ-451
Publ.-Id: 451


Fission and emission of intermediate mass fragments in asymmetric heavy - ion collisions investigated at the FOBOS 4pi - array

Wagner, W.; Ortlepp, H.-G.; Herbach, C.-M.; Gippner, P.; Matthies, A.; Renz, G.; Schilling, K.-D.; Penionzhkevich, Y. E.; Strekalovsky, O. V.; Zhuchko, V. E.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-105 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-450
Publ.-Id: 450


Fission of hot heavy nuclei investigated at the FOBOS 4pi - array

Wagner, W.; Ortlepp, H.-G.; Herbach, C.-M.; Gippner, P.; Matthies, A.; Renz, G.; Schilling, K.-D.; Kamanin, D. V.; Penionzhkevich, Y. E.; Strekalovsky, O. V.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-104 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-449
Publ.-Id: 449


The COMBAS fragment separator of radioactive nuclei and the FOBOS 4pi - detector for charged particles

Ortlepp, H.-G.; Wagner, W.; Dietterle, S.; Dshemuchadse, S.; Gippner, P.; Herbach, C.-M.; Aleksandrov, A. A.; Aleksandrova, I. A.; Doronin, V. N.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-103 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-448
Publ.-Id: 448


SAXS Investigation of the Structural Changes in the Plastic Zone Ahead of a Crack Tip in Ductile Metals

Große, M.; Hempel, A.; Böhmert, J.; Eichhorn, F.; Riekel, C.; Engstroem, P.

  • Journal of Molecular Structure 383 (1996) pp. 267-270

Permalink: https://www.hzdr.de/publications/Publ-447
Publ.-Id: 447


Cluster beams from a Co-Nd liquid alloy ion source

Bischoff, L.; Teichert, J.; Hesse, E.; Prewett, P. D.; Watson, J. G.

A Cobalt-Neodymium Liquid Alloy Ion Source (LAIS) is investigated with respect to ist cluster emission behaviour. Clusters and molecular ions were found. The influence of the source emission current on the cluster emission intensity and also on the cluster mass distributationis studied. The Co-Nd LAIS was used for writing patterning (implantation, sputtering) in a mass-selecting Focused Cluster Beam (FCB) system. Theoretical estimations were carried out concerning the use of the FCB for direct deposition at landing energies of about 100 eV / atom. First experimental results of cobalt FCBs are presented.

  • Microelectronic Engineering 30 (1996) pp. 245-248
  • Lecture (Conference)
    MNE'95

Permalink: https://www.hzdr.de/publications/Publ-446
Publ.-Id: 446


Hadron Production in pBe interactions at 14.6 GeV/c

Müller, H.

Invariant cross sections for the production of π±, K ±, p and d in pBe interactions at 14.6 GeV/c are well reproduced by calculations carried out in the framework of the Rossendorf collision model.

  • Zeitschrift für Physik A 353 (1995) pp. 237

Permalink: https://www.hzdr.de/publications/Publ-445
Publ.-Id: 445


Anwendungsmöglichkeiten neuartiger EDV-gestützter Erkennungsmethoden zur Identifikation gefährlicher Betriebszustände in Chemieanlagen

Schmitt, W.; Steiff, A.

  • Other report
    Preprints des Workshops "Reaktionsführung bei chem. Synthesen im techn. Maßstab mit Unterstützung durch moderne Methoden der EDV", Bonn, 24.5.95, S. 67 - 75

Permalink: https://www.hzdr.de/publications/Publ-443
Publ.-Id: 443


Stand und Wirtschaftlichkeit von Sonnen- und Windenergienutzung zur Stromerzeugung in Sachsen

Rindelhardt, U.

In den letzten Jahren war in Sachsen eine dynamische Entwicklung bei der Nutzung der Wind- und Sonnenenergie zu Erzeugung von Elektroenergie zu verzeichnen. Derzeit sind in Sachsen etwa Windenergieanlagen mit einer Leistung von insgesamt 20 MW und netzgekoppelte Photovoltaikanlagen mit einer Leistung von knapp 600 kW in Betrieb. Die Windenergienutzung befindet sich derzeit an der Schwelle zur Wirtschaftlichkeit (Stromgestehungskosten etwa 17 Pf/kWh), bis zum Jahr 2000 kann mit einer installierten Leistung bis zu 200 MW gerechnet werden. Demgegenüber ist Strom aus Photovoltaikanlagen noch um den Faktor 10 zu teuer.

  • Lecture (Conference)
    XXVII Kraftwerkstechnisches Kolloquium der TU Dresden, 24./25.10.1995, Tagungsband Teil I, S. 45
  • Contribution to proceedings
    XXVII Kraftwerkstechnisches Kolloquium der TU Dresden, 24./25.10.1995, Tagungsband Teil I, S. 45

Permalink: https://www.hzdr.de/publications/Publ-442
Publ.-Id: 442


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