Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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32179 Publications
Chemische Reaktion an der Phasengrenze nichtmischbarer Flüssigkeiten
Grahn, A.;
Im Vortrag werden Versuche zum reaktiven Stoffübergang über die Phasengrenze zweier nicht mischbarer Lösungsmittel und die dabei auftretenden hydrodynamischen Instabilitäten sowie die numerische Simulation dieser Vorgänge in einer vertikalen Spaltgeometrie vorgestellt.
Keywords: hydrodynamische Instabilität, fluide Phasengrenze, Grenzflächenreaktion
  • Lecture (others)
    29. Sitzung des DECHEMA/GVC-Arbeitsausschusses "Reaktionstechnik sicherheitstechnisch schwieriger Prozesse"

Publ.-Id: 2855 - Permalink


Experimentelle und numerische Untersuchungen zu Instabilitäten beim reaktiven Stoffübergang an einer ebenen fluiden Phasengrenze im vertikalen Spalt
Grahn, A.; Eckert, K.;
Spontane Grenzflächenkonvektionen an fluiden Phasengrenzen führen beim Stoffübergang zu einer signifikanten Erhöhung der pro Zeiteinheit übertragenen Stoffmenge. Zwei Mechanismen, die Rayleigh-Bénard- und die Marangoniinstabilität, sind für die Entstehung dieser Konvektionen verantwortlich. Gegenstand der Arbeit sind Stoffaustauschvorgänge, die von exothermen chemischen Reaktion begleitet werden. Diese führen zur Ausbildung von Konzentrations- und Temperaturgradienten im Bereich der fluiden Phasengrenze. Grenzflächenkonvektionen treten als Folge der Kopplung von Stoff-, Energie- und Impulstransport auf. Bei einfachen Neutralisationsreaktionen an der Phasengrenze konnte eine Vielzahl unterschiedlicher Konvektionsstrukturen festgestellt werden.

In einem vertikalen Spalt (Breite=1mm) wurden zwei miteinander begrenzt mischbare Lösungsmittel (Wasser und Isobutanol bzw. Cyclohexan) übereinandergeschichtet. In der leichteren organischen Phase liegt eine Fettsäure (Ameisen-, Essig- oder Propionsäure), in der schwereren wässrigen Phase Natronlauge vor. Der Stoffübergang der Fettsäure erfolgt von der organischen an die wässrige Phase. Daran schließt sich unter Wärmefreisetzung die Neutralisationsreaktion in unmittelbarer Nachbarschaft der Phasengrenze an.

Im Verlauf des reaktiven Stoffübergangs durchläuft das System 3 Stadien. Das Anfangsstadium ist von aufsteigenden Plumes (pilzförmige Bereiche von Fluid geringerer Dichte) in der organischen Phase gekennzeichnet. Das Zwischenstadium wird von Plumes in der oberen Phase und der unregelmäßigen Bildung von Fingern in der unteren Phase bestimmt. Das Plume-Regime der oberen Phase wird zunehmend ungeordneter und löst sich im weiteren Verlauf auf. Im Endstadium hat sich in der unteren Phase ein regelmäßiges Fingerregime ausgebildet. Dieses Regime ist charakteristisch für die doppelt-diffusive Instabilität, die hier durch die unterschiedlichen Diffusivitäten von Wärme und Stoff sowie die Überlagerung zweier die Stabilität gegensätzlich beeinflussender Gradienten verursacht wird. Die Fingerinstabilität ist von der thermohalinen Konvektion, dem Transport von Salz und Wärme in Ozeanen her bekannt und stellt einen sehr effizienten Mischungsvorgang dar. Sowohl Plume- als auch Fingerinstabilität sind verantwortlich für die sich selbst erhaltende Dynamik des Systems, die im Experiment über 2 Stunden lang beobachtet werden konnte.

Numerische Untersuchungen werden mit dem Ziel durchgeführt, die beobachteten Transportvorgänge durch ein 2D-Modell, das die Bilanzgleichungen für Stoff, Energie und Impuls berücksichtigt, nachzubilden. Die Abbildung zeigt die zeitliche Entwicklung des Stoffstroms durch die Phasengrenze für den reaktiven und den reaktionsfreien Stoffübergang von Essigsäure. Nach anfänglich diffusivem Stoffübergang werden die Konzentrationsgrenzschichten instabil und es setzen Konvektionsbewegungen ein. Diese führen zum sprunghaften Ansteigen des Stoffstroms. Durch die Kombination solutaler und thermischer Effekte fällt dieser Anstieg beim reaktiven Stoffübergang wesentlich stärker als beim nichtreaktiven aus. Die Fluktuationen der dargestellten Größe resultieren aus dem instationären Charakter des konvektiven Stoffübergangs.
Keywords: hydrodynamische Instabilitäten, fluide Phasengrenzen, Grenzflächenreaktion
  • Lecture (Conference)
    GVC-Jahrestagung, Leipzig 1999
  • Abstract in refereed journal
    Chemie Ingenieur Technik 71 (1999) 945

Publ.-Id: 2854 - Permalink


Colloid-Borne Uranium and Other Heavy Metals in the Water of a Mine Drainage Gallery
Zänker, H.; Richter, W.; Brendler, V.; Nitsche, H.;
The water of a mine drainage gallery was investigated for its contents of colloid-borne heavy metals with empha-sis on uranium. About 1 mg/L of colloid particles of 100 to 300 nm in size were found. They consist of a matrix of Fe and Al oxyhydroxides and are formed when anoxic slightly acidic shaft waters mix with oxic near-neutral gal-lery water. The colloid matrix bears toxic trace elements metals such as As, Pb, and Cu. Carbonato and aquo complexes prevent the uranyl from being adsorbed to the colloids in the unaltered gallery water. Acidification destroys these complexes: up to 50 mass percent of the uranium is attached to the colloids in the slightly acidic pH region. Further acidification converts the uranyl again to a "non-colloidal" form. The heavy metals are most likely bound to the Fe and Al colloids as inner sphere surface complexes.
  • Lecture (Conference)
    Vortrag auf "Migration 99", Incline Village, USA
  • Radiochimica Acta 88, 619-624 (2000)

Publ.-Id: 2853 - Permalink


Bericht der Frühjahrstagung der Studiengruppe für Elektronische Instrumentierung vom 7.-9. April 1997 in Darmstadt (GSI)
Gabriel, F.;
  • Open Access LogoWissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-185

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Publ.-Id: 2852 - Permalink


A theoretical search for possible high efficiency semiconductor based field assisted positron moderators
Beling, C. D.; Fung, S.; Ming, L.; Gong, M.; Panda, B. K.;
  • Applied Surface Science 149 (1999) 253-259

Publ.-Id: 2851 - Permalink


Investigation on stress evolution in boron nitride films
Fitz, C.; Fukarek, W.; Kolitsch, A.; Möller, W.;
Boron nitride films have been grown by ion beam assisted deposition (IBAD) using a Kaufman ion source and an electron beam evaporator. Cantilevers made from <100> Si have been used as substrates. Instantaneous stress data are derived from dynamic simultaneous measurement of cantilever bending and film thickness during growth. The instantaneous stress in t-BN layers is found to increase with film thickness and to be in the range between 1.6 and 4.2 GPa. At the nucleation of c-BN the stress increases up to about 10 GPa and remains constant during c-BN growth. Correlations between the ion to atom arrival ratio and the Ar/N2 ratio and the instantaneous stress are discussed. The stress relaxation during Ar+-ion post implantation has been measured.
Keywords: boron nitride; thin films; intrinsic stress
  • Surface and Coatings Technology 128-129 (2000) 292-297

Publ.-Id: 2847 - Permalink


An instrument for in-situ stress measurement in thin films during growth
Fitz, C.; Fukarek, W.; Kolitsch, A.; Möller, W.;
An improved stress-measuring technique based on the cantilever bending principle is presented. Thermal shift of the sample holder position that results in errors in the stress data is minimised by evaluating the difference in the deflection of two laser beams. The film thickness is calculated from the reflected laser intensity or from ellipsometry data recorded simultaneously during film growth. Without using a lock-in technique or image processing, the resolution in bending force-per-unit-width is 0.02 N/m for a 50 µm thick cantilever. The system represents an easy, versatile and cheap technique to measure intrinsic and thermal stresses in thin films. The system has been employed to record the instantaneous stress during ion beam assisted deposition of BN films and the global stress during ion induced amorphisation of silicon.
Keywords: cantilever; intrinsic stress; thin films
  • Surface and Coatings Technology 128-129 (2000) 474-478

Publ.-Id: 2846 - Permalink


Growth and characterization of hard and elastic carbon nitride thin films
Kolitsch, A.; Möller, W.; Malkow, T.; Bull, S. J.; Magula, V.; Domankova, M.;
Hard CNx films were prepared by nitrogen ion beam assisted deposition (IBAD) of evaporated carbon on silicon wafers with a nitrogen ion energy of 100 to 1200eV, ion/neutral transport ratios from 0.7 to 1.7, and deposition temperatures from RT to 1000°C. The films were characterised by ERDA, XPS, TEM, ED, EELS, and nanoindentation.
By varying the deposition parameters a maximum nitrogen content of < 33 at.% was found at N/C transport ratios of about 1.2. Further increase of this ratio did not result in a higher nitrogen content in the films. XPS measurement reflects a shift of the main chemical state of the nitrogen bonds with changing nitrogen content of the films and with increasing deposition temperature. The nitrogen content of the films was drastic decreased with increasing temperatures > 600°C.
EELS investigations have shown weak changes of the plasmon peak position and the sp2/sp3 ratio with increasing deposition temperature in correlation to the nitrogen content of the carbon films.
Nanoindentation techniques have been used to investigate the mechanical properties such as hardness and elastic modulus of the films. High hardness and elastic modulus values for those composites have been found. All measured structural and mechanical properties correlate with the analysed nitrogen content.

Keywords: carbon nitride, ion beam assisted deposition, IBAD, ERD, EELS, XPS, thin film deposition
  • Surface and Coatings Technology 128-129 (2000) 126-132

Publ.-Id: 2845 - Permalink


Microstructure and Oxidation Kinetics of Intermetallic TiAl after Si- and Mo- Ion-Implantation
Hornauer, U.; Richter, E.; Matz, W.; Reuther, H.; Mücklich, A.; Wieser, E.; Möller, W.; Schumacher, G.; Schütze, M.;
Titanium aluminide alloys based on gamma-TiAl have a substantial potential for high temperature application. However, there are still problems concerning the high temperature oxidation behavior. Ion implantation is a promising tool to improve the oxidation resistance without disturbing the mechanical properties. A systematic investigation of the microstructure and phase development of silicon and molybdenum implanted gamma-TiAl is presented. For Si, the fluence is varied from 2.5·1016 cm-2 to 8·1017 cm-2 at an implantation energy of 1 MeV resulting in a local con-centration of Si between 1 at% and 35 at% at a projected range of 1 µm measured by AES depth profiling. Grazing incidence XRD and transmission electron microscopy show the formation of a buried Ti5Si3 enriched layer at 650 °C, which acts as a diffusion barrier for oxygen. Long term TGA oxidation tests at 900 °C in air show a positive effect in the beginning of oxi-dation for the fluence of 8·1017 cm-2. After a few hours the oxidation kinetic is similar to unimplanted Ti50Al, but the mass gain after 100 h is still 30 % smaller. The influence of the local Si concentration on the oxidation behavior is discussed. Implantation of Mo at 180 keV (2·1016 cm-2 and 1·1017 cm-2) has only minor influence on the oxidation at 900 °C. After implantation, Mo precipitates are found for the high fluence.
Keywords: implantation, TiAl, oxidation, silicon, molybdenum
  • Poster
    Surface and Coatings Technology 128-129 (2000) 418-422
  • Contribution to external collection
    Surface and Coatings Technology 128-129 (2000) 418-422

Publ.-Id: 2843 - Permalink


Erste Ergebnisse aus Säulenexperimenten zur Untersuchung des Migrationsverhaltens von U(VI) im System Gohy 532 / Gorlebensand
Pompe, S.;
  • Poster
    Workshop Institut für Kernchemie der Universität Mainz, Mainz, Germany, 13. 03. 1998

Publ.-Id: 2841 - Permalink


Einfluß von Huminstoffen auf das Migrationsverhalten von Schadstoffen
Trautmann, N.; Pompe, S.; Heise, K.-H.; Bernhard, G.; Bubner, M.; Nitsche, H.; Beck, H. P.; Wagner, H.; Keuth, U.; Schank, M.; Mansel, A.; Seibert, A.; Keller, H.;
  • Contribution to external collection
    Forschungszentrum Karlsruhe, Report FZKA-PTE Nr. 5, 147-172 (1998)

Publ.-Id: 2840 - Permalink


EPR evidence of tetrahalogeno(triphenylmethylimido)rhenium(VI) complexes [Re{NC(C6H5)3}X4] (X = Cl, Br)
Voigt, A.; Kirmse, R.; Abram, U.;
  • Inorg. Chem. Communications 1, 203 (1998)

Publ.-Id: 2835 - Permalink


An electron paramagnetic resonance study of tetrabutylammoniumtetrabromonitridorhenate(VI), [(n-C4H9)4N] [ReNBr4]
Voigt, A.; Abram, U.; Strauch, P.; Kirmse, R.;
  • Inorg. Chim. Acta 271,199 (1998)

Publ.-Id: 2834 - Permalink


Evidence for Relativistic Effects in the Chemistry of Element 104
Türler, A.; Buklanov, G. V.; Eichler, B.; Gäggeler, H. W.; Grantz, M.; Hübener, S.; Jost, D. T.; Lebedev, V. Y.; Piguet, D.; Timokhin, S. N.; Yakushev, A. B.; Zvara, I.;
  • J. Alloys Comp. 271-273, 287 (1998)

Publ.-Id: 2833 - Permalink


Zur Problematik der Bestimmung dynamischer Festigkeitswerte im instrumentierten Kerbschlagbiegeversuch
Richter, H.;
Zur Bewertung der strukturellen Integrität von Bauteilen werden auch Festigkeitskennwerte unter schlagartigen Belastungsbedingungen benötigt.
Eine Möglichkeit dynamische Festigkeitskennwerte abzuschätzen, bietet die Berechnung der dynamischen Fließ- und Biegebruchspannungen aus den nach ISO/CD 14 556 im instrumentierten Kerbschlagbiegeversuch bestimmten charakteristischen Kräften. Üblicherweise werden die Festigkeitswerte unter Schlagbiegebelastung nach einem Vorschlag von SERVER (1978) berechnet. Dieser Vorschlag wurde aus einer Lösung der Fließlinientheorie nach EWING (1968) abgeleitet.
SERVERs Formalismus gilt für ISO-V-Proben, die mit einer ASTM-Finne belastet werden, da die Zusammenhänge durch EWING (1968) für diese Belastung hergeleitet wurden. Bei Anwendung einer DIN/ISO-Hammerfinne (r=2 mm) ist aber davon auszugehen, dass sich für gekerbte Proben ungefähr 5 % und bei zusätzlicher Berücksichtigung einer größeren Stützweite 9 % höhere Festigkeitswerte ergeben können.
  • Lecture (others)
    Vortrag zur Jahressitzung 1999 der DVM-Arbeitsgruppe "Instrumentierter Kerbschlagbiegeversuch", 24.09.1999, TU Bergakademie Freiberg

Publ.-Id: 2832 - Permalink


Decay properties of 256Sg(Z=106) and 266Sg(Z=106)
Türler, A.; Dressler, R.; Eichler, B.; Gäggeler, H. W.; Jost, D. T.; Schädel, M.; Brüchle, W.; Gregorich, K. E.; Trautmann, N.; Taut, S.;
  • Phys. Rev. C 57, 1648 (1998)

Publ.-Id: 2831 - Permalink


Sorption behaviour of rutherfordium and thorium from HCl/Hf containing aqueous solution
Schumann, D.; Nitsche, H.; Taut, S.; Jost, D. T.; Gäggeler, H. W.; Yakushev, A. B.; Buklanov, G. V.; Domanov, V. P.; Din, T. L.; Kubica, B.; Misiak, R.; Szeglowski, Z.;
  • J. Alloys and Compounds 271-273, 307 (1998)

Publ.-Id: 2830 - Permalink


Sorption behaviour of W, Hf, Lu, U, and Th on ion exchangers from HCl/H2O2 solutions. Model experiments for chemical studies of Seaborgium (Sg)
Schumann, D.; Andrassy, M.; Nitsche, H.; Novgorodov, A. F.; Misiak, R.; Schädel, M.; Brüchle, W.; Schausten, B.; Kratz, J. V.; Bruchertseifer, H.;
  • Radiochim. Acta 80, 1 (1998)

Publ.-Id: 2829 - Permalink


Coordination Behavior of the fac-[Tc(CO)3]+ Moiety towards Macrocyclic Thioethers of Various Ring Size: Synthesis and Structure of the Complexes fac-[Tc(9-ane-S3)(CO)3]Br, fac-[Tc2(tos)2(18-ane-S6)(CO)6] and fac-[Tc2(20-ane-S6-OH)(CO)6][tos]2
Schibli, R.; Alberto, R.; Abram, S.; Abram, S.; Egli, A.; Schubiger, P. A.; Kaden, T. A.;
  • Inorg. Chem. 37, 3509 (1998)

Publ.-Id: 2828 - Permalink


Use of Instrumented Charpy Impact Tests for the Determination of Fracture Toughness Values
Viehrig, H.-W.; Böhmert, J.; Dzugan, J.;
A number of techniques has been under development to estimate fracture mechanics parameters using the instrumented Charpy impact test. The evolution of elastic-plastic fracture mechanics has led to the use of small test specimens to achieve valid cleavage fracture toughness values based on the J-Integral concept, KJc, in the lower ductile-to-brittle transition temperature (DBTT) range. A successful concept bases on the statistical data treatment methodology with the Weibull-type statistic. It has been demonstrated that the probabilistic-based estimates of the median fracture toughness of ferritic steels tend to form transition curves of the same shape, the so-called "master curve", normalized to one common specimen size, namely the 1T (i.e. 25 mm thick) specimen. This method covers the determination of a reference temperature, T0, at a median fracture toughness, KJc, of 100 MPa m1/2. Furthermore toughness parameters in terms of J-Integral based ductile crack initiation toughness, KJi, have been also used for the integrity assessment of structures. The determination of KJi values by the instrumented impact test requires the detection of the ductile crack initiation on the dynamic load vs. displacement curve.
Keywords: instrumented impact test, master curve concept, fracture toughness, crack initiation, acoustic emission
  • Lecture (Conference)
    From Charpy to Present Impact Testing, ESIS-Publication 30, D. Francois, A. Pineau, Eds., Charpy Centenary Conference, 2-5 October 2001, Poitiers, France, Elsevier Science Ltd. and ESIS, 2002, p. 245
  • Contribution to proceedings
    From Charpy to Present Impact Testing, ESIS-Publication 30, D. Francois, A. Pineau, Eds., Charpy Centenary Conference, 2-5 October 2001, Poitiers, France, Elsevier Science Ltd. and ESIS, 2002, p. 245

Publ.-Id: 2827 - Permalink


Sequences around the fragmentation sites of the large subunit rRNA in the family Rhizobiaceae
Selenska-Pobell, S.; Döring, H.;
  • Antonie van Leewenhoek 73, 55-67 (1998)

Publ.-Id: 2826 - Permalink


Sorption of Uranium (VI) onto Phyllite and its Mineral Constituents
Zorn, T.; Arnold, T.; Bernhard, G.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2825 - Permalink


Wechselwirkung von Moorwasserkolloiden mit Uranyl(VI)-Ionen
Zänker, H.; Hüttig, G.; Richter, W.; Schmeide, K.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2824 - Permalink


Colloid Characterization in a Humic-Rich Environmental Water Containing Varying Concentrations of Uranyl(VI) Ions
Zänker, H.; Hüttig, G.; Richter, W.; Schmeide, K.; Nitsche, H.;
  • Poster
    13th Radiochemical Conference Mariánske Lázne-Jachymov, Czech Republic, 20.-24.04.1998

Publ.-Id: 2823 - Permalink


Einsteinium: Entropien und Enthalpien der Adsorption auf Niobium, Tantal und Titanium
Taut, S.; Hübener, S.; Eichler, B.; Türler, A.; Gäggeler, H. W.; Timokhin, S. N.; Zvara, I.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2822 - Permalink


Thermoanalytische Untersuchungen an Huminsäuren und ihren Uran(VI)- und Eisen(III)- Komplexen
Schuster, G.; Bubner, M.; Pompe, S.; Jander, R.; Henkel, K.; Heise, K.-H.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2821 - Permalink


Microstructural investigation of Sn nanoclusters in double-energy implanted and annealed SiO2 layers with cross-sectional TEM
Markwitz, A.; Grötzschel, R.; Heinig, K.-H.; Rebohle, L.; Skorupa, W.;
  • Nuclear Instruments and Methods in Physics Research B 152 (1999) 319-324

Publ.-Id: 2820 - Permalink


Complexation of U(VI) with Aquatic Humic Acid Isolated from Bog Water
Schmeide, K.; Geipel, G.; Zänker, H.; Heise, K.-H.;
  • Poster
    13th Radiochemical Conference Mariánske Lázne-Jachymov, Czech Republic, 20.-24.04.1998

Publ.-Id: 2819 - Permalink


Molekulare Untersuchungen bakterieller Diversität in Erdproben aus uranhaltigen Abfallhalden
Satschanska, G.; Kampf, G.; Flemming, K.; Selenska-Pobell, S.;
  • Poster
    Wissenschaftliche Konferenz: BIODIVERSITÄT der WGL Berlin, Germany, 17.-19.11.1998

Publ.-Id: 2818 - Permalink


Molecular bacterial diversity in soils of two East German uranium waste piles
Satschanska, G.; Kampf, G.; Flemming, K.; Selenska-Pobell, S.;
  • Poster
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2817 - Permalink


Komplexierung von Uran(VI) mit Arsen
Rutsch, M.; Geipel, G.; Brendler, V.; Bernhard, G.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2816 - Permalink


Charakterisierung anorganischer und organischer Kolloide in bergbaurelevanten Wässern.
Richter, W.; Zänker, H.; Nitsche, H.;
  • Poster
    4. Kolloquium des DFG-Schwerpunktprogramms "Geochemische Prozesse mit Langzeitfolgen im anthropogen beeinflußten Sickerwasser und Grundwasser" Freiberg, Germany, 26.-27.03.1998.

Publ.-Id: 2815 - Permalink


Structural Analysis of the Interaction of Uranium(VI) with Humic Acid and Simple Carboxylic Acids Using EXAFS
Reich, T.; Denecke, M. A.; Pompe, S.; Otto, A.; Brendler, V.; Bubner, M.; Heise, K.-H.; Nitsche, H.; Allen, P. G.; Bucher, J. J.; Edelstein, N. M.; Shuh, D. K.;
  • Poster
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998

Publ.-Id: 2814 - Permalink


Characterization of the surface layer of the Bacillus sphaericus isolate JG-A12 from a uranium waste pile
Raff, J.; Kirsch, R.; Kutschke, S.; Maier, T.; Mertig, M.; Selenska-Pobell, S.; Bernhard, G.; Hahn, U.; Pompe, W.;
  • Poster
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2813 - Permalink


Selective accumulation of heavy metals in drain waters of a uranium waste pile by indigenous Bacilli
Panak, P.; Selenska-Pobell, S.; Boudakov, I.; Miteva, V.; Bernhard, G.; Nitsche, H.;
  • Poster
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2812 - Permalink


Bacteria from a uranium mining waste pile: interaction with U(VI)
Panak, P.; Kutschke, S.; Selenska-Pobell, S.; Geipel, G.; Bernhard, G.; Nitsche, H.;
  • Poster
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2811 - Permalink


Wechselwirkung von U(VI) mt Bakterien aus Uranhalden
Panak, P.; Kutschke, S.; Selenska-Pobell, S.; Geipel, G.; Bernhard, G.; Nitsche, H.;
  • Poster
    GDCh-Tagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2810 - Permalink


RAPD and Rep-APD analysis of Bacillus sphaericus
Miteva, V.; Mitev, V.; Selenska-Pobell, S.;
  • Poster
    8th Int. Symposium on Genetics of Industrial Microorganisms Israel, 28.06.-03.07.1998

Publ.-Id: 2809 - Permalink


Molecular and radiochemical analysis of Thiobacillus ferrooxidans strains recovered from a uranium waste pile in Saxony
Kutschke, S.; Panak, P.; Groudeva, V.; Selenska-Pobell, S.; Bernhard, G.; Nitsche, H.;
  • Poster
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2808 - Permalink


Seaborgium: Charakterisierung als Oxidhydroxid
Hübener, S.; Brüchle, W.; Dressler, R.; Eichler, B.; Gäggeler, H. W.; Grantz, M.; Heyne, H.; Jäger, E.; Jost, D. T.; Kirbach, U.; Nitsche, H.; Piguet, D.; Schädel, M.; Schimpf, E.; Taut, S.; Trautmann, N.; Türler, A.; Vahle, A.; Yakushev, A. B.;
  • Poster
    GDCh-Tagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2807 - Permalink


EXAFS Investigations of Uranyl Sorption on Ferrihydrite
Hennig, C.; Reich, T.; Arnold, T.; Roßberg, A.; Nitsche, H.;
  • Poster
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998

Publ.-Id: 2806 - Permalink


Implantation of boron ions into hard metals
Mrochek, I.; Günzel, R.; Matz, W.; Möller, W.; Anishchik, V.;
  • Nukleonika 44(1999)2, 217-224

Publ.-Id: 2805 - Permalink


The Problem of Preferred Orientation in EXAFS Measurements - Solvable with X-ray Diffraction?
Hennig, C.; Kraus, W.; Nolze, G.;
  • Poster
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998

Publ.-Id: 2804 - Permalink


Korrektur der Koordinationszahlbestimmung für die Uranylgruppe aus EXAFS-Messungen pulverförmiger Proben
Hennig, C.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2803 - Permalink


Humic Acid Research at FZR
Heise, K.-H.; Pompe, S.; Schmeide, K.; Bubner, M.; Schuster, G.; Nicolai, R.; Zänker, H.; Reich, T.; Geipel, G.; Baraniak, L.; Bernhard, G.; Nitsche, H.;
  • Poster
    Uranium Mining and Hydrogeology II Freiberg, Germany, 15.-17.09.1998

Publ.-Id: 2802 - Permalink


Huminsäureforschung im FZR - Melanoidine als Modell-Huminsäuren
Heise, K.-H.; Pompe, S.; Nicolai, R.; Schmeide, K.; Bubner, M.; Reich, T.; Nitsche, H.;
  • Poster
    Uranium Mining and Hydrogeology II Freiberg, Germany, 15.-17.09.1998

Publ.-Id: 2801 - Permalink


FTIR-Untersuchungen zur Komplexierung von Uran(V) durch huminsäureähnliche Melanoidine
Heise, K.-H.; Nicolai, R.; Pompe, S.; Bubner, M.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2800 - Permalink


Mineralisierung von Kohlenstoff-14-haltigen Reststoffen durch anodische Oxidation
Förster, E.; Heller, S.; Heise, K.-H.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuclearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2794 - Permalink


Die Synthese isotopmarkierter Modellhuminsäuren
Bubner, M.; Pompe, S.; Meyer, M.; Heise, K.-H.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2793 - Permalink


Vergleich der Sorption von Eisen und Uran an Erzgebirgsmetamorphiten und Elbtalsedimenten unter aeroben und anaeroben Bedingungen und unter dem Einfluß organischer Grubenwasserinhaltsstoffe
Abraham, A.; Mack, B.; Baraniak, L.; Nitsche, H.;
  • Poster
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2792 - Permalink


Forschungszentrum Rossendorf; Jahresbericht 1996
Leib, J.;
  • Open Access LogoForschungszentrum Rossendorf, Jahresbericht 1996

Downloads:

Publ.-Id: 2791 - Permalink


Photonenkorrelationsspektroskopie und Rasterkraftmikroskopie an Huminsäure.
Zänker, H.;
  • Lecture (others)
    TU Dresden, Institut für Werkstoffwissenschaft Dresden, Germany, 17.12.1998

Publ.-Id: 2790 - Permalink


Charakterisierung der Kolloidpartikel in den Wasserfließsystemen stillgelegter sächsischer Bergbauanlagen.
Zänker, H.; Richter, W.; Nitsche, H.;
  • Lecture (Conference)
    4. Kolloquium des DFG-Schwerpunktprogramms "Geochemische Prozesse mit Langzeitfolgen im anthropogen beeinflußten Sickerwasser und Grundwasser" Freiberg, Germany, 26.-27.04.1998

Publ.-Id: 2789 - Permalink


Thermochromatography of Elemental Einsteinium
Taut, S.; Hübener, S.; Eichler, B.; Eberhardt, K.; Trautmann, N.; Peterson, Y. R.;
  • Lecture (Conference)
    13th Radiochemical Conference Mariánské Lázne, Czech Republic, 19.-24.04.1998

Publ.-Id: 2788 - Permalink


Molecular studies of the culturable and non-culturable bacteria in uranium wastes
Selenska-Pobell, S.;
  • Lecture (Conference)
    Uranium Mining and Hydrogeology II Freiberg, Germany, 15.-17.09.1998

Publ.-Id: 2787 - Permalink


Magnetic moment measurements in the semi-magic nuclei 94Ru and 95Rh after recoil implantation into iron and nickel
Jungclaus, A.; Kast, D.; Lieb, K. P.; Lingk, C.; Teich, C.; Iordanov, O.; Härtlein, T.; Schwalm, D.; Johnstone, I. P.; Schwengner, R.;
  • European Physical Journal A, 6, 29-36, (1999)

Publ.-Id: 2786 - Permalink


Diversity in natural bacterial populations in the uranium wastes as examined by a 16S rDNA retrieval
Selenska-Pobell, S.;
  • Lecture (others)
    Inst. of Molecular Biology, Bulgarian Academy of Sciences Sofia, Bulgaria, 07.10.1998

Publ.-Id: 2785 - Permalink


Selective accumulation of heavy metals in drain waters of a uranium waste pile by three indigenous Bacillis strains
Selenska-Pobell, S.;
  • Lecture (others)
    Institute of Microbiology, Bulgarian Academy of Sciences Sofia, Bulgaria, 25.06.1998

Publ.-Id: 2784 - Permalink


Analysis of the culturable members of the natural bacterial communities in uranium waste piles
Selenska-Pobell, S.;
  • Lecture (others)
    Dept. of Geomicrobiology, University of Sofia Sofia, Bulgaria, 06.06.1998

Publ.-Id: 2783 - Permalink


Effect of Humic Acid on the Uranium Sorption on Phyllite and its Constituents
Schmeide, K.; Pompe, P.; Heise, K.-H.; Nitsche, H.;
  • Lecture (Conference)
    4th EU Project Meeting "Effects of Humic Substances on the Migration of Radionuclides: Complexation and Transport of Actinides" Leuven, Belgium, 19.-20.11.1998

Publ.-Id: 2782 - Permalink


Case-Study: Uranium-Mining Rock Pile No. 250 in the Region Schlema/Alberoda (Saxony, Germany)
Schmeide, K.; Geipel, G.; Heise, K.-H.; Nitsche, H.;
  • Lecture (Conference)
    4th EU Project Meeting "Effects of Humic Substances on the Migration of Radionuclides: Complexation and Transport of Actinides" Leuven, Belgium, 19.-20.11.1998

Publ.-Id: 2781 - Permalink


Effect of Humic Substances on the Sorption of Uranium(VI) onto Site-Specific Rock Material
Schmeide, K.; Zorn, T.; Zänker, H.; Heise, K.-H.; Nitsche, H.;
  • Lecture (Conference)
    EC Project Meeting, Centre d´Etudes de Saclay Paris, France, 11.-12.05.1998

Publ.-Id: 2780 - Permalink


Complexation of Uranyl(VI) by Humic Substances in Absence and Presence of Sulfate
Schmeide, K.; Geipel, G.; Zänker, H.; Heise, K.-H.; Nitsche, H.;
  • Lecture (Conference)
    EC Project Meeting, Centre d´Etudes de Saclay Paris, France, 11.-12.05.1998

Publ.-Id: 2779 - Permalink


Photolysis of silicic acid and new particle formation
Rettig, D.; Merker, P.; Nitsche, H.;
  • Lecture (Conference)
    5th International Aerosol Conference Edinburgh, Scottland, 12.-18.09.1998

Publ.-Id: 2778 - Permalink


Speziationsbestimmung von Uran in umweltrelevanten Systemen mittels Röntgenabsorptionsspektroskopie
Reich, T.;
  • Lecture (Conference)
    Universität Leipzig, Fakultät für Chemie und Mineralogie Leipzig, Germany, 19.10.1998

Publ.-Id: 2777 - Permalink


Synchrotronstrahlungsuntersuchungen an Radionuklidsystemen
Reich, T.;
  • Lecture (Conference)
    GDCh-Fachtagung, FG Nuklearchemie Dresden, Germany, 07.-09.09.1998

Publ.-Id: 2776 - Permalink


X-ray Absorption Fine Structure Studies of Uranium in Environmental Systems
Reich, T.;
  • Lecture (Conference)
    Lawrence Berkeley National Laboratory Berkeley, CA, USA, 19.05. 1998

Publ.-Id: 2775 - Permalink


Application of X-ray Absorption Spectroscopy in Radioecology
Reich, T.; Bernhard, G.; Nitsche, H.;
  • Lecture (Conference)
    13th Radiochemical Conference Mariánské Lázne, Czech Republic, 19.-24.04.1998

Publ.-Id: 2774 - Permalink


Anwendung der Röntgenabsorptionsspektroskopie in der Radioökologie
Reich, T.;
  • Lecture (Conference)
    Zentrumsseminar "Anwendung der Synchrotronstrahlung" Forschungszentrum Rossendorf e.V., Rossendorf, Germany, 08. 01. 1998

Publ.-Id: 2773 - Permalink


Metal cluster formation on bacterial surface layer proteins
Pompe, W.; Mertig, M.; Kirsch, R.; Raff, J.; Selenska-Pobell, S.;
  • Lecture (Conference)
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2772 - Permalink


Einfluß von Huminstoffen auf das Migrationsverhalten radioaktiver und nichtradioaktiver Schadstoffe unter naturnahen Bedingungen. (IFR-Teilbericht zum BMBF-Verbundprojekt-Abschluß)
Pompe, S.; Heise, K.-H.; Bernhard, G.; Nitsche, H.;
  • Lecture (Conference)
    BMBF-Projektmeeting, FZ Karlsruhe Karlsruhe, Germany, 22.-23.10.1998

Publ.-Id: 2771 - Permalink


Erste Ergebnisse aus Säulenexperimenten zur Untersuchung des Migrationsverhaltens von Uran(VI) im System GoHy-532 / Gorlebensand
Pompe, S.; Artinger, R.;
  • Lecture (Conference)
    BMBF-Projektmeeting Universität Mainz, Institut für Kernchemie Mainz, Germany, 12.03.1998

Publ.-Id: 2769 - Permalink


Characterization of a Sulfate-Reducing Bacterium which is able to Reduce Uranium
Pietzsch, K.; Panak, P.; Hard, B. C.; Babel, W.;
  • Lecture (Conference)
    Uranium Mining and Hydrogeology II Freiberg,Germany, 15.-17.09.1998

Publ.-Id: 2768 - Permalink


Bacteria from uranium mining waste piles: Complex formation of Thiobacillus ferrooxidans with U(VI)
Panak, P.;
  • Lecture (Conference)
    Uranium Mining and Hydrogeology II Freiberg, Germany, 15.-17.09.1998

Publ.-Id: 2767 - Permalink


Environmental Nuclear Chemistry: Uranium Speciation by Laser Fluorescence and X-ray Absorption Spectroscopy
Nitsche, H.;
  • Lecture (Conference)
    European Synchrotron Radiation Facility (ESRF) Grenoble, France, Oct. 1998

Publ.-Id: 2766 - Permalink


Application of Synchrotron Radiation Techniques to Radionuclide Studies
Nitsche, H.; Reich, T.; Hennig, C.; Roßberg, A.; Geipel, G.; Denecke, M. A.; Baraniak, L.; Panak, P.; Abraham, A.; Mack, B.; Selenska-Pobell, S.; Bernhard, G.;
  • Lecture (Conference)
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998
  • Contribution to proceedings
    Speciation, Techniques and Facilities for Radioactive Materials at Synchrotron Light Sources pp. 15-27 (OECD Publications 2, Paris Cedex, France) Workshop Proceedings Grenoble, France, 4-6 October 1998

Publ.-Id: 2764 - Permalink


Radionuclide Migration and Transport in the Vadose Zone: R&D Needs in Measurements and Modelling
Nitsche, H.; Brendler, V.;
  • Lecture (Conference)
    Fourth Intern. Symposium and Exhibition on Environmental Contamination in Central and Eastern Europ, Warsaw, Poland, 15.-17.09.1998

Publ.-Id: 2763 - Permalink


Data transferability into numerical models and sources of uncertainty
Nitsche, H.;
  • Lecture (Conference)
    EC-Cluster Workshop "Radionuclide Transport/Retardation Processes" Brussels, Belgium, 19.-20.03.1998

Publ.-Id: 2762 - Permalink


Molecular characterization of several Thiobacillus ferrooxidans strains recovered from an uranium mine waste pile in Germany
Kutschke, S.; Groudeva, V.; Selenska-Pobell, S.;
  • Lecture (Conference)
    Euroconference: Bacterial-Metal/Radionuclide Interaction Rossendorf/Dresden, Germany, 02.-04.12.1998

Publ.-Id: 2761 - Permalink


A Monochromator Feedback System
Hennig, C.;
  • Lecture (Conference)
    14th CRG Club Meeting Grenoble, France, 19.-20.10.1998

Publ.-Id: 2760 - Permalink


Synthetic Humic Acids for Radioecological Environmental Research
Heise, K.-H.; Bubner, M.; Pompe, S.; Nitsche, H.;
  • Lecture (Conference)
    Joint European International Isotope Society Conference Bad Soden, Germany, 24.-26.06.1998

Publ.-Id: 2759 - Permalink


Speciation of Uranium - Determination and Calculation under Natural Conditions Uranium Mining and Hydrogeology II
Geipel, G.; Rutsch, M.; Bernhard, G.; Brendler, V.; Nitsche, H.;
  • Lecture (Conference)
    Freiberg, Germany, 15.-17.09.1998

Publ.-Id: 2758 - Permalink


The Radiochemistry Safety System at ROBL
Funke, H.;
  • Lecture (Conference)
    14th CRG Club Meeting Grenoble, France, 19.-20.10.1998

Publ.-Id: 2757 - Permalink


The Radiochemistry Experimental Station at the Rossendorf Beamline (ROBL)
Funke, H.; Reich, T.; Bernhard, G.; Brendler, V.; Claussner, J.; Hüttig, G.; Matz, W.; Neumann, W.; Oehme, W.;
  • Lecture (Conference)
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998

Publ.-Id: 2756 - Permalink


Characterization of the Deformation Field Near the Crack-Tip after Bending by Small Angle X-ray Scattering
Böhmert, J.; Große, M.;
The inhomogeneous deformation field ahead the crack tip of pre-cracked and bended Charpy-V specimens was monitored by scanning with a highly focussed X-ray beam at the Synchrotron Radiation Facility (ESRF). The measured scattering pattern shows two characteristic features:
- streak-like anisotropic scattering with different symmetry
- isotropic scattering.
The streaks are produced by scattering at the grain boundaries. The slope of the Guinier plot of the scattering intensity in the streaks yields an effective scattering thickness of the grain boundary of 1.4 nm. The isotropic scattering intensity can be explained as scattering at the dislocation structure. Its dependence on the scattering vector follows a Porod law with exponents between -3.3 and -2.8. The local distribution of both the integral scattering intensity and the Porod exponent reflect the shape of the plastic zone ahead of the crack tip.
The results demonstrate that small angle X-ray scattering with a scanning microfocussed beam provides a new method to characterize inhomogeneous deformation states with a resolution of few micrometers.
  • Lecture (Conference)
    Conference of the Federation of European Material Societies EUROMAT'99, Sept. 1999, Munich, Microstructural Investigation and Analysis, EUROMAT, Vol. 4, B. Jouffrey and J. Svejcar (Editors), DGM, Weinheim, 2000, pp. 114-120
  • Contribution to proceedings
    Conference of the Federation of European Material Societies EUROMAT'99, Sept. 1999, Munich, Microstructural Investigation and Analysis, EUROMAT, Vol. 4, B. Jouffrey and J. Svejcar (Editors), DGM, Weinheim, 2000, pp. 114-120

Publ.-Id: 2755 - Permalink


Sortion of Uranium (VI) onto schwertmannite
Arnold, T.; Bernhard, G.; Nitsche, H.;
  • Lecture (Conference)
    Europ. Res. Conf. "Geochemistry of Crystal Fluids. Characterization of reactive transport in natural systems"; Aghia Pelaghia, Greece, 22. - 27. 05. 1998

Publ.-Id: 2754 - Permalink


Applications of XAFS Spectroscopy to Specation Problems in Environmental Radiochemistry
Allen, P. G.; Shuh, D. K.; Bucher, J. J.; Edelstein, N. M.; Reich, T.;
  • Lecture (Conference)
    Euroconference and NEA Workshop: Actinide-XAS-98 Grenoble, France, 04.-06.10.1998

Publ.-Id: 2752 - Permalink


Terminal Nitrido Ligands - Lewis Bases for the Coordination Chemist
Abram, U.;
  • Lecture (others)
    University of Graz, Austria, 14.05.1998

Publ.-Id: 2751 - Permalink


Crystal Structure Determination for Everybody
Abram, U.;
  • Lecture (others)
    University of Santiago de Compostela, Spain, 03.02.1998

Publ.-Id: 2750 - Permalink


Synthesis and Stereochemistry of the Spin Adducts of a New Chiral Spin Trap, 3,5-Diphenyl-5-methylpyrroline-1-oxide
Matasyoh, J. C.; Abram, U.; Schuler, P.; Stegmann, H. B.;
  • J. Magnet. Resonance 36, 422 (1998)

Publ.-Id: 2749 - Permalink


XANES Investigation of Chemical States of Nitrogen in Polyaniline
Hennig, C.; Hallmeier, K. H.; Szargan, R.;
  • Synthetic Metals 92/2, 161 (1998)

Publ.-Id: 2748 - Permalink


Die Rolle von Huminsäuren in der Umwelt
Heise, K.-H.; Pompe, S.; Schmeide, K.; Bubner, M.; Nitsche, H.;
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; Jahresbericht 1997, FZR-240, S. 30-35 (1998)

Publ.-Id: 2747 - Permalink


Darstellung, Strukturen und Photolyse von Rheniumisocyanato-Komplexen
Bonfada, E.; Strähle, J.; Abram, U.;
  • Z. anorg. allg. Chem. 624, 757 (1998)

Publ.-Id: 2746 - Permalink


Synthesis and structures of technetium(I) and rhenium(I) tricarbonyl complexes with bis(diphenylthiophosphoryl)-amide, {M[(Ph2PS)2N](CO)3(CH3CN)} (M = Tc, Re)
Abram, U.; Abram, S.; Schibli, R.; Alberto, R.; Dilworth, J. R.;
  • Polyhedron 17, 1303 (1998)

Publ.-Id: 2745 - Permalink


[NBu4][ReNCl4]: Facile synthesis, structure, electron paramagnetic resonance spectroscopy and reactions
Abram, U.; Braun, M.; Abram, S.; Kirmse, R.; Voigt, A.;
  • J. Chem. Soc. Dalton Trans. 1998, 231

Publ.-Id: 2744 - Permalink


A man-made element’s brilliant career
Abram, U.;
  • Science Spectra 12, 58 (1998)

Publ.-Id: 2743 - Permalink


Computer simulation and RBS/C studies of high dose N+ and Al co-implantation in 6H-SiC
Kharlamov, V. S.; Kulikov, D. V.; Trushin, Y. V.; Yankov, R. A.; Voelskow, M.; Petzoldt, J.; Skorupa, W.;
  • Contribution to external collection
    Proc. SPIE-The Int.Society for Optical Engineering 3345 (1998) 260

Publ.-Id: 2742 - Permalink


Strukturuntersuchungen an Mischkristallen V1-xNbxO2
von Woedtke, F.; Reich, T.; Denecke, M. A.; Nitsche, H.; Oppermann, H.;
  • Lecture (Conference)
    9. Tagung Festkörperanalytik, Chemnitz, Germany, 23.-26.06.1997

Publ.-Id: 2741 - Permalink


Thermoanalytical Investigations on the Oxidizing Degradation of Natural and Synthetic Humic Acids and their Calcium and Uranyl Complexes
Schuster, G.; Bubner, M.; Pompe, S.; Heise, K.-H.; Nitsche, H.;
  • Lecture (Conference)
    12. Ulm-Freiberger Kalorimetrietage, Freiberg, Germany, 19.-21.3.1997

Publ.-Id: 2740 - Permalink


Bacteria from uranium mining waste pile: Interactions with U(VI)
Panak, P.; Hard, B. C.; Pietzsch, K.; Kutschke, S.; Röske, K.; Selenska-Pobell, S.; Bernhard, G.; Nitsche, H.;
  • Lecture (Conference)
    Actinides ‘97, Baden-Baden, Germany, 21.-26.09.1997
  • J. Alloys and Compounds 271-273, 262 (1998)

Publ.-Id: 2739 - Permalink


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