Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

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Anwendung des feinfokussierten Ionenstrahles zur Fertigung mikromechanischer Bauelemente

Bischoff, L.; Teichert, J.; Hesse, E.; Geßner, T.; Löbner, B.; Breng, U.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-31
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-146

The Observation of Phonons in TSCC by Pulsed Neutron Diffraction

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

  • Poster
    ECM-15, Dresden 28.8.-2.9.1994, Book of Abstracts, 15. European Crystollographic Meeting
  • Beitrag zu Proceedings
    ECM-15, Dresden 28.8.-2.9.1994, Book of Abstracts, 15. European Crystollographic Meeting

Permalink: https://www.hzdr.de/publications/Publ-145

Messung der Volumenströme von Gas und Flüssigkeit in einer Zweikomponentenströmung mit Ultraschall und Mustererkennung

Prasser, H.-M.; Hensel, F.; Schütz, P.

Abstract

The state-of art of ultrasonic two-phase flow measurements is characterised by a number of different approaches commonly based on the identification and characterisation of individual voids (bubbles, plugs etc.) applying the techniques of ultrasonic testing. The recorded individual events are integrated to extract parameters as void fraction or volume flow rates. The main limitation of these methods arises from the complicated structure of two-phase flow at higher void fractions which leads to multiple diffractions of the sound beam. The measurement is therefore limited to low void fractions or an easy flow structure.
The main idea of the present work was to overcome these limitations by means of pattern recognition. An ultrasonic beam crossing the two-phase flow is modulated by the changing structure of the voids passing by and therefore the through-transmission signal must contain information about the parameters of the two-phase flow even if information about individual flow effects cannot be derived. Therefore it was supposed that a pattern recognition algorithm trained with signals obtained at known conditions is able to identify the set of the flow parameters (flow rates, void fraction etc.) in an unknown situation.

  • Vortrag (Konferenzbeitrag)
    ACHEMA '94, Internationales Treffen für Chemische Technik und Biotechnologie, Frankfurt am Main, 5.-11.06.1994

Permalink: https://www.hzdr.de/publications/Publ-144

Fluidik-ISFET-Mikrosystem

Pham, T.; Howitz, S.

  • Vortrag (Konferenzbeitrag)
    "Sensoren-Technologie und Anwendungen", Bad Nauheim, März 1994

Permalink: https://www.hzdr.de/publications/Publ-143

Erfahrungen und Ergebnisse des 1000-Dächer-Photovoltaik-Programms in Sachsen

Rindelhardt, U.; Teichmann, G.

Abstract

Die Ergebnisse aus dem einjährigen Betrieb von 43 netzgekoppelten PV-Anlagen in Sachsen werden dargestellt. Schwerpunkte bilden die architektonische Einbindung der Generatoren in die Gebäude, die mögliche Synchronisation zwischen solarer Stromerzeugung und dem Verbrauch von Elektroenergie sowie Erfahrungen bei der Installation und dem Betrieb von netzgekoppelten PV-Anlagen.
Hervorhebenswert sind die Ergebnisse zum möglichen Eigenverbrauch des solar erzeugten Stromes. Es konnte gezeigt werden, daß gerade energiesparende Haushalte stark auf die "Zwischenspeicherung" im öffentlichen Netz angewiesen sind (Eigenverbrauch 20 %). Maximal wird ein Eigenverbrauch von ca. 50 % erreicht.
Die erreichten jährlichen Energieerträge betragen im Mittel 680 kWh/kWp, wobei große Unterschiede zwischen den einzelnen Anlagen gefunden wurden. Als Hauptursache für die unterschiedlichen energetischen Ergebnisse werden Abweichungen der Modulparameter von den Datenblattangaben der Hersteller vermutet.

  • Vortrag (Konferenzbeitrag)
    9. Nationales Symposium Photovoltaische Solarenergie, Staffelstein, 16.-18.3.1994, Tagungsband S. 149
  • Beitrag zu Proceedings
    9. Nationales Symposium Photovoltaische Solarenergie, Staffelstein, 16.-18.3.1994, Tagungsband S. 149

Permalink: https://www.hzdr.de/publications/Publ-142

The reaction Au + Au at 150 AMeV simulated by the Copenhagen Statistical Multifragmentation Model

Neubert, W.; Mösner, J.; Kotte, R.; Wohlfarth, D.; Barz, H.-W.

  • Beitrag zu Proceedings
    XXXII International Winter Meeting on Nuclear Physics, Bormio, Italy, 24.-29.1.1994

Permalink: https://www.hzdr.de/publications/Publ-141

Thermal Diffuse Scattering in Time-of-Flight Neutron Diffraction Studied on SBN and TSCC Single Crystals

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

Permalink: https://www.hzdr.de/publications/Publ-140

Developmental changes of enzymes involved in peptide degradation in isolated rat brain microvessels

Brust, P.; Bech, A.; Kretzschmar, R.; Bergmann, R.

Permalink: https://www.hzdr.de/publications/Publ-139

The Neutronphysical Development of the IBR-2 Reflektor

Noack, K.

  • Kerntechnik 59 (1994) 6

Permalink: https://www.hzdr.de/publications/Publ-138

Gas Chromatographie Studies of Molybdenum in Humid Oxygen

Roß, A.; Hübener, S.; u. a.

  • Bericht, sonstiger
    Annual Report 1993 im Paul Scherrer Institut

Permalink: https://www.hzdr.de/publications/Publ-137

ROSY (2. Fassung)

Einfeld, D.; Matz, W.

Abstract

Der Projektvorschlag für eine kompakte Synchrotronstrahlungsquelle der 3. Generation ROSY wird beschrieben. Die Quelle sol1 für die Materialforschung dediziert sein, die für die Forschung im regionalen Umfeld von Rossendorf prägend ist.
Bei einer Speicherringenergie von 3 GeV wird Synchrotronstrahlung im harten Röntgenbereich mit einer kritischen Energie des Spektrums von Ec = 8,4 keV (hc=0,14 nm) emittiert. Mit einer naturlichen Emittanz von 28 n nm rad wird eine sehr brillante Strahlung zur Verfügung gestellt. Neben der Strahlung aus Ablenkmagneten kann Strahlung aus Wigglern und Undulatoren genutzt werden. Für diese insertion devices sind 8 Einbaumöglichkeiten vorhanden, von denen 4 in nichtdispersionsfreien geraden Strecken liegen. Der Speicherring hat eine vierfache Symmmetrie, einen Umfang von 148 m und ist als modifizierte FODO-Struktur konzipiert. Ein nachträglicher Einbau von supraleitenden Ablenkmagneten zur Erzeugung eines harteren Spektrums und damit zur Ausweitung des Anwendungsbereiches ist möglich.
Der Teil I enthält die wissenschaftliche Begründung fur ROSY und eine Darstellung der Nutzungsmöglichkeiten. Im Teil II werden das Speicherringkonzept und die technischen Details der einzelnen Komponenten beschrieben.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-27 (2. Auflage) 1993
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-136

Correlation between volume fraction of radiation-induced precipitates and toughness of VVER pressure vessel steel 15Kh2MFA

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

Abstract

The deterioration of mechanical properties of reactor pressure vessel (RPV) steel during its irradiation in a nuclear power plant is known as neutron embrittlement. It is for instance manifested as a shift of the ductile - brittle transition temperature toward higher values. The microscopic mechnisms of neutron embrittlement of low alloy RPV steel are not yet fully understood. It is known that dislocation loops, vacancy clusters (voids) and precipitates are formed during irradiation.
The dimensions of radiation induced precipitates are less than 5 nm, in RPV steel 15Kh2MFA they are about 1 - 3 nm. One of the objectives of present research in this field is to throw light on the nature of these precipitates.
In this article the correlation between the results of small angle neutron scattering (SANS) and the ductile - brittle transition temperature are studied and possible mechanisms of neutron embrittlement are discussed.

  • Journal of Nuclear Materials 211 (1994), pp. 177 - 180

Permalink: https://www.hzdr.de/publications/Publ-135

Photon production in an expanding and chemically equilibrating gluon-enriched plasma

Kämpfer, B.; Pavlenko, O. P.

Abstract

Abstract Photon production in a longitudinally and transversely expanding gluon plasma with initially little quark admixture is considered. Chemical equilibration of quarks and gluons is followed by rate equations. The yields of hard photons withE2 GeV are insensitive to chemical equilibration and depend mainly on the initial thermalized state. Medium-energy photons withE1 GeV are more frequently produced in case of faster equilibration, despite of faster cooling. For an assumed fast equilibration we follow the evolution of matter through mixed and hadron phases. The transverse momentum kick, due to transverse expansion, of photons from hadron matter is shown to be reduced for an equation of state with reduced latent heat. The photon yield in the regionE>1 GeV from deconfined matter dominates for conditions, estimated to be achieved at RHIC, in case of a weakly first-order confinement transition.

Permalink: https://www.hzdr.de/publications/Publ-134

Quasi-particle description of a strongly interacting pion gas

Bunatian, G. G.; Kämpfer, B.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-28 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-133

Resonante Röntgenkleinwinkelstreuung zur Untersuchung bestrahlungsinduzierter Ausscheidungen im Stahl 15Ch2MFA

Große, M.; Böhmert, J.; Eichhorn, F.; Haubold, H.-G.; Goerik, G.

  • Beitrag zu fremdem Sammelwerk
    Jahresbericht 1993 des HASYLAB

Permalink: https://www.hzdr.de/publications/Publ-132

Trigonal-bipyramidale Technetium- und Rhenium-Komplexe mit vierzähnigen tripodalen NS3-Liganden

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

  • Angewandte Chemie 106 (1994) 13 pp. 1416-1419

Permalink: https://www.hzdr.de/publications/Publ-131

Technetium Complexes with Thioether Ligands

Pietzsch, H.-J.; Spies, H.; Leibnitz, P.; Reck, G.; Johannsen, B.

Permalink: https://www.hzdr.de/publications/Publ-129

Occurence and Nature of Different Tc(V) and Re(V) Complexes with Mercapto/Amide Ligands

Johannsen, B.; Noll, B.; Leibnitz, P.; Reck, G.; Noll, S.; Spies, H.

Permalink: https://www.hzdr.de/publications/Publ-128

Achromatic two-stage E x B mass filter for a focused ion beam column with collimated beam

Teichert, J.; Tiunov, M. A.

Abstract

A two-stage achromatic E x B mass seperator has been desinged for a high-current focused ion beam column with collimated beam. The seperator consists of two homogeneous field E x B filters, a stigmator and the seperation aperture. The second-order geometrical and chromatic aberration coefficients are derived and their dependence on magnetic pole piece and electrode geometry are investigated in performing electric and magnetic field calculations. The influence of the mass seperator on the spatial resolution of the column is discussed.

  • Measurement Science and Technology 4 (1993) pp. 754-763

Permalink: https://www.hzdr.de/publications/Publ-127

Cosmic phase transitions

Kämpfer, B.; Lukacs, B.; Paal, G.

  • Buch (Autorenschaft)
    beim Verlag: Teubner, Stuttgart-Leipzig (1994), TEUBNER-TEXTE zur Physik, Band 29 (1994)

Permalink: https://www.hzdr.de/publications/Publ-126

Dilepton production as probe for nuclear exotic states and nuclear interactions

Bratkovskaya, E. L.; Kämpfer, B.; Titov, A. I.

  • Beitrag zu fremdem Sammelwerk
    World Scientific, Signapore, Hadrons and Nuclei from QCD, K. Fuji et al. (Eds.), 123

Permalink: https://www.hzdr.de/publications/Publ-125

Dilepton radiation from pre-equilibrium parton matter

Kämpfer, B.; Pavlenko, O. P.

  • Beitrag zu Proceedings
    Int. Workshop on Nuclei + Nuclear Excitations, Hirschegg 1993

Permalink: https://www.hzdr.de/publications/Publ-124

Estimates of dielectron production in pp and pd reactions at 1 - 2 GeV

Kämpfer, B.; Titov, A. I.; Bratkovskaya, E. L.

  • Physics Letters B 301 (1993) 123
  • Open Access Logo Forschungszentrum Rossendorf; FZR 92-04 1992
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-123

Nuclear structure funktion F2A:Moments Mn(F2A) and kinematics beyond x=1

Kaptari, L. P.; Umnikov, A. Y.; Kämpfer, B.

  • Physical Review D 47 (1993) 3804
  • Open Access Logo Forschungszentrum Rossendorf; FZR 92-7 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-122

Velocity correlations of intermediate mass fragments produced in central collisions of Au + Au at E = 150 A MeV

Kämpfer, B.; Kotte, R.; Mösner, J.; Neubert, W.; Wohlfarth, D.; Alard, J. P.; Basrak, Z.; Bastid, N.; Belayev, I. M.; Blaich, T.; Buta, A.; Caplar, R.; Cerruti, C.; Cindro, N.; Coffin, J. P.; Dupieux, P.; Erö, J.; Fan, Z. G.; Fintz, P.; Fodor, Z.; Freifelder, R.; Fraysse, L.; Frolov, S.; Gobbi, A.; Grigorian, Y.; Guillaume, G.; Herrmann, N.; Hildenbrand, K. D.; Hölbling, S.; Houari, A.; Jeong, S. C.; Jorio, M.; Jundt, F.; Kecskemeti, J.; Koncz, P.; Korchagin, Y.; Krämer, M.; Kuhn, C.; Legrand, I.; Lebedev, A.; Maguire, C.; Manko, V.; Matulewicz, T.; Mgebrishvili, G.; Moisa, D.; Montaru, G.; Montbel, I.; Morel, P.; Pelte, D.; Petrovici, M.; Rami, F.; Reisdorf, W.; Sadchikov, A.; Schüll, D.; Seres, Z.; Sikora, B.; Simion, V.; Smolyankin, S.; Sodan, U.; Teh, K.; Tezkratt, R.; Trzaska, M.; Vasiliev, M. A.; Wagner, P.; Wessels, J. P.; Wienold, T.; Wilhelmi, Z.; Zhilin, A. L.

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Permalink: https://www.hzdr.de/publications/Publ-121

Photon production in a expanding and chemically equilibrating gluon-enriched plasma

Kämpfer, B.; Pavlenko, O. P.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-29 Preprint Dezember 1993
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-118

Institute of Bioinorganic and Radiopharmaceutical Chemistry; Annual Report 1992

Johannsen, B.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-12
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-117

Institute of Radiochemistry; Annual Report 1992

Bernhard, G.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-15
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-115

Institute of Safety Research; Annual Report 1992

Weiß, F.-P.; Böhmert, J.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-25
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-113

Electrical and optical properties of Co alloyed ß-FeSi2 formed by ion beam synthesis

Panknin, D.; Henrion, W.; Wieser, E.; Voelskow, M.; Skorupa, W.; Vöhse, H.

  • Beitrag zu Proceedings
    MRS Fall Meeting 1993, Boston

Permalink: https://www.hzdr.de/publications/Publ-110

Ion Beam Induced Epitaxial Crystallization of Single Crystalline 6H-SiC

Heera, V.; Kögler, R.; Skorupa, W.; Glaser, E.

  • Beitrag zu Proceedings
    MRS Fall Meeting 1993, Boston

Permalink: https://www.hzdr.de/publications/Publ-109

Untersuchungen zur Windenergienutzung in Sachsen

Hirsch, W.; Lischke, R.; Matthäi, J.; Rindelhardt, U.

Abstract

Im Rahmen eines umfangreichen Programmes wurden Untersuchungen zur Anwendbarkeit der Windatlas-Methode (WASP) zur Ermittlung des Windenergiepotentials in Sachsen durchgeführt. Das Ziel der Untersuchungen bestand darin, die erwarteten Grenzen bei der Nutzung von WASP in orografisch gegliedertem Gelände genauer zu ermitteln. Grundlage der Berechnungen waren Messungen von vier Stationen des sächsischen Windmeßprogrammes. Es konnte gezeigt werden, daß in großen Gebieten der Oberlausitz die Windatlas-Methode genutzt werden kann. In den Kammregionen des Erzgebirges wurden widersprüchliche Ergebnisse gefunden, so daß eine Nutzung hier praktisch nur in sehr kleinen Repräsentationsgebieten in der Umgebung einer Meßstation möglich ist.

  • Vortrag (Konferenzbeitrag)
    Kongreß "TERRATEC" 9.-12.3.1994, Leipzig, Tagungsband S. 144
  • Beitrag zu Proceedings
    Kongreß "TERRATEC" 9.-12.3.1994, Leipzig, Tagungsband S. 144

Permalink: https://www.hzdr.de/publications/Publ-108

ION-BEAM ANALYSIS INVESTIGATIONS ON MULTILAYER DEVICES FOR VISIBLE OPTICS

Wagner, W.; Rauch, F.; Jescakowski, U.; Bawge, K.

  • Beitrag zu fremdem Sammelwerk
    TATF 1994 PROCEEDINGS

Permalink: https://www.hzdr.de/publications/Publ-107

Formation of CoSi2 wires by maskless implantation with the focused ion beam

Teichert, J.; Bischoff, L.; Hesse, E.; Panknin, D.; Skorupa, W.

Abstract

The maskless ion implatation with the focused ion beam as as a new method for ion beam synthesis of cobalt silicide wires is presented. In order to perform the implantation a special achromatic mass seperator was implemented into the ion column, liquid alloy ion sources for cobalt ions were 30 keV Co+ and 60 keV Co++ ions. The dose dependence for room temperature implantation and the influence of the substrate temperature were investigated.

  • Vortrag (Konferenzbeitrag)
    und Proceedings MRS Fall Meeting, Boston, 29.11.-3.12.1993
  • Materials Research Society, Symposium Proceedings; Materials Synthesis and Processing Using Ion Beams; Vol. 316 (1994) pp. 741-746
  • Materials Research Society, Symposium Proceedings; Silicides, Germanides, and Their Interfaces; Vol. 320 (1994) pp. 153-158

Permalink: https://www.hzdr.de/publications/Publ-106

Two-phase flow behaviour during a medium size cold leg test on PMK-II (SPE-4)

Prasser, H.-M.; Zippe, W.; Baldauf, D.; Szabados, L.; Ézsöl, G.; Baranyai, G.; Nagy, I.

Abstract

The Hungarian integral test rig PMK of the KFKI Atomic Energy Research Institute was used as a source of experimental data for the IAEA Standard Problem Exercise SPE-4, a Medium size cold leg Loca with a secondary Bleed-and-feed procedure. The needle shaped conductivity probes developed by the Research Center Rossendorf have been applied in order to obtain information about the void fraction and the structure of the two-phase flow. The primary circuit of the PMK-II test facility was practically fully equipped with probes (with exception of the core simulator and the downcomer). An overview of the signals of all probes and the general chronology of characteristic events are discussed. As a main result the mechanism of the hot leg loop-seal clearing was clarified in detail.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994, Stuttgart, 17.-19.5.1994
  • Beitrag zu Proceedings
    Jahrestagung Kerntechnik 1994, 17.-19. Mai 1994, Stuttgart, Tagungsbericht, ISSN 0720-9207, S. 77-80

Permalink: https://www.hzdr.de/publications/Publ-105

Bestimmung der Neutronenflüsse in der drehbaren Bestrahlungseinrichtung im BER-II des HMI Berlin

Stephan, I.; Gawlik, D.; Gatschke, W.; Matthes, M.

Abstract

Zur Aktualisierung der Neutronenparameter in der drehbaren Bestrahlungseinrichtung des rekonstruierten BER-II wurde der im Forschungszentrum Rossendorf entwickelte Mehrkomponentenaktivierungsdetektor eingesetzt.
Durch das umfangreiche Datenmaterial sind axiale und radiale Neutronenflußverläufe bestimmt und es gelingt ein eindeutiger Bezug von Meßwert zur Bestrahlungsprobe.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994
  • Open Access Logo Forschungszentrum Rossendorf; FZR-33
    ISSN: 1436-3976
  • Beitrag zu Proceedings
    Jahrestagung Kerntechnik 1994, Stuttgart, p. 519

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Permalink: https://www.hzdr.de/publications/Publ-104

Komponentenschwingungen an WWER-Reaktoren "Diagnose und Modellierung"

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

Abstract

Seit Anfang der 70er Jahre sind an WWER-440-Reaktoren mehrfach anomale Schwingungen von Einbauten des RDB beobachtet worden, die teilweise zu Komponentenschäden führten.
Daher wurden speziell für den WWER-Typ zugeschnittene Diagnoseverfahren entwickelt, die auf der Korrelationsanalyse von Schwankungsanteilen des Neutronenflusses (incore und excore) und von nichtnuklearen Signalen wie Körperschall, Druckfluktuation und Beschleunigungen beruhen.
Um eine wirklich sensitive Fehlerfrüherkennung zu erreichen, wird ein theoretisches Schwingungsmodell auf der Basis Finiter Elemente (FE) entwickelt. Dieses Modell gestattet die Interpretation von gemessenen Schwingungssignalen in dem Sinne, daß die gemessenen Resonanzpeaks den Eigenschwingungen des gekoppelten mechanischen Systems zugeordnet werden können.
Darüber hinaus werden Sensitivitätsstudien durchgeführt, die die Veränderungen des Schwingungsverhaltens bei mechanischen Komponentenschäden verdeutlichen.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994

Permalink: https://www.hzdr.de/publications/Publ-103

Analytical and Experimental Investigations for Modelling the Fluid-Structure-Interaction in Annular Gaps

Grunwald, G.; Altstadt, E.

Abstract

Modelling the mechanical vibrations of pressurized water reactor internals the fluid-structure-interaction is to be taken into account. Especially at VVER-440 reactors there is a strong influence of the fluid due to the specific geometry. The intention of the presentation is to provide a solution of the continuity and the Navier-Stokes equations for the special case of a narrow annular gap geometry considering the fluid friction.
To obtain an analytical solution for these coupled 3D partial differential equations further assumptions and simplifications must be made:

  • the width of the annular gap is small compared with the diameter,
  • displacements of the mechanical structure are small compared with the gap width
  • the fluid flow velocity components are independent on the radius.
Keeping these assumptions in mind one can reduce the dimension of the continuity equation from 3D to 2D by averaging over the gap width.
Two elementary types of motion of the cylinder are considered: parallel displacement and pendular motion. By superimposing these elementary types even more general motions can be described.
In practice the application could be meaningful for core barrel motion at LWRs in general and for flow induced vibrations of control elements at VVER-440 reactors.
The analytical results are compared with experimental ones from a cylindrical pendulum setup. The criteria of comparison are the eigenfrequency and the damping of the pendulum in the static and flowing fluid. There is a good agreement between analytical and experimental results. Especially the strong influence of the chosen boundary condition upon the pressure equations can be shown.
  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994
  • Bericht, sonstiger
    Arbeitsbericht: FWSM - 1/1993

Permalink: https://www.hzdr.de/publications/Publ-102

Rechnungen zum Naturumlaufexperiment ISP-33 an der Anlage Pactel mit dem Code ATHLET

Krepper, E.

Abstract

Due to the low geodetic height differences and the presence of loop seals in VVER-reactors, the behaviour of natural circulation is an important safety feature. The experiment to the OECD/NEA/CSNI International Standard Problem No. 33 was dedicated to the investigation of this phenomenon. During the test, defined quantities of primary coolant waere drained, while the facility was operated at 10% of nominal power and without pumps. The test was stopped with increasing temperatures of the fuel rod simulator.
In RC Rossendorf pre- and posttest calculations were performed by the code ATHLET, which was developed by the "Gesellschaft für Anlagen- und Reaktorsicherheit".
The main events of the experiment could be predicted, shown and explained by the ATHLET calculations:

  • After draining of about 20% of the primary inventory, the mass flow in the loops stagnates. Simultaneously, the primary pressure increases and the pressurizer is partly refilled.
  • In later periods the mass flow through the three loops is nonequally distributed, which could be reproduced by the ATHLET calculations at least qualitatively.
  • Beitrag zu Proceedings
    und Vortrag: Jahrestagung Kerntechnik Stuttgart 1994, Proceedings pp. 93-96

Permalink: https://www.hzdr.de/publications/Publ-101

Natural Circulation Instabilities During a Loca of VVER-Type Reactors

Krepper, E.; Rohde, U.

Abstract

In the Research Centre Rossendorf pre- and posttest calculations to the OECD/NEA/CSNI International Standard Problem No. 33 were carried out with the GRS code ATHLET. This Problem was a natural circulation experiment with stepwise reduced primary coolant inventory. In the ATHLET calculations after a drainage of about 50% of the primary inventory cyclic oscillations of the mass flows and the void fractions were observed. These are found in the experimental results also. A simple analytical model was developed to distinguish physically caused oscillations from numerically caused ones. The oscillations observed could be interpreted as density wave instability in the local recirculation loop core- bypass.

  • Vortrag (Konferenzbeitrag)
    und Proceedings: International Conference New Trends in Nuclear System Thermohydraulics, Pisa, 30.5.-2.6.1994, pp. 793 - 797

Permalink: https://www.hzdr.de/publications/Publ-100

3-Dimensional Analysis of a Baron Dilution Accident by Using the Code DYN3D/M2

Grundmann, U.; Rohde, U.

Abstract

An incorrect startup of a pump in an isolated loop containing a plug of diluted absorber can initiate a reactivity accident in a VVER-440. It is assumed that the main gate valve is opened after starting the main coolant pump. When the plug enters the core, it gives rise to a positive reactivity. An asymmetric distribution of diluted water in the core is expected which requires a 3-dimensional analysis for a more correct description of this accident.
The code DYN3D/M2 developed for investigations of reactivity initiated accidents in thermal reactors with hexagonal fuel elements is used for analysis. A model describing the mixing of water from the different loops in the lower plenum of a VVER-440 reactor gives the boron concentration at the inlet of each fuel element. The two limiting cases, ideal mixing and no mixing, are investigated for comparisons.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994

Permalink: https://www.hzdr.de/publications/Publ-99

Bestrahlungsexperimente im Rheinsberger WWER-2-Reaktor zum Nachweis der neutroneninduzierten Versprödungssuszeptibilität von russischen Druckbehälterstählen

Böhmert, J.; Viehrig, H.-W.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994

Permalink: https://www.hzdr.de/publications/Publ-98

Rotationsbanden mit geneigter Spinorientierung in geraden Xe- und Ba-Kernen

Dönau, F.; Frauendorf, S.; Vogel, O.; Gelberg, A.; von Brentano, P.

  • Beitrag zu fremdem Sammelwerk
    Verhandlungen der DPG (VI) 29 (1994) s. 1941

Permalink: https://www.hzdr.de/publications/Publ-94

Vibrations versus collisions and the iterative structure of two-body dynamics

Pfitzner, A.; Cassing, W.; Peter, A.

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Permalink: https://www.hzdr.de/publications/Publ-92

Neutron Fluence Calculations and Spectrum Adjustments for the Rheinsberg Pressure Vessel Steel Irradiation Program

Barz, H.-U.; Böhmer, B.; Konheiser, J.

Abstract

The starting point of these investigations is the performed irradiation program for the Rheinsberg reactor for 3 different reactor periods during 1984 to 1988. In this program a great number of steel specimens were irradiated at different positions. Additionally a certain number of activation monitors were installed. For the planned mechanical proof of these specimens information of the irradiation condition of all specimens are needed. Therefore we have to calculate the neutron fluences at the different irradiation points for all relevant reactor periods. A spectrum adjustment is used to proof and correct calculational results taking into account measurement results.

  • Vortrag (Konferenzbeitrag)
    Jahrestagung Kerntechnik 1994 vom 17.-19.5.1994
  • Beitrag zu Proceedings
    Jahrestagung Kerntechnik 1994 vom 17.-19.5.1994, Tagungsbericht S. 19

Permalink: https://www.hzdr.de/publications/Publ-91

PET for treatment plan verification and beam monitoring in light ion tumour therapy.

Hasch, B.-G.; Manfraß, P.; Pawelke, J.; Sobiella, M.; Enghardt, W.; Blochberger, P.; Friedrich, A.; Geißel, H.; Irnich, H.; Kraft, G.; Magel, A.; Meufels, W.; Münzenberg, G.; Nickel, F.; Poppensieker, K.; Schall, I.; Schardt, D.; Scheidenberger, C.; Voss, B.; Ziegler, C.

  • Vortrag (Konferenzbeitrag)
    Proceedings of the XIth International Conference on Computers in Radiation Therapy, 20-24 March 1994, Manchester, 364-365
  • Beitrag zu Proceedings
    Proceedings of the XIth International Conference on Computers in Radiation Therapy, 20-24 March 1994, Manchester, 364-365

Permalink: https://www.hzdr.de/publications/Publ-89

Development of a cobalt liquid alloy ion source

Hesse, E.; Bischoff, L.; Teichert, J.

Abstract

A cobalt-neodymium liquid alloy ion source for applications in focused ion beam devices was developed and investigated. The performance and the main parameters of the ion source are presented.

  • Journal of Physics D: Applied Physics (Rapid Communication) 27 (1994) pp. 427-428

Permalink: https://www.hzdr.de/publications/Publ-88

Determination of Inorganic Species in Seepage Water of Uranium-Mining Rockpiles and in Related Media

Geipel, G.; Thieme, M.

Permalink: https://www.hzdr.de/publications/Publ-87

Excited states built on the 6- isomer in ...

Winter, G.; Schwengner, R.; Reif, J.; Prade, H.; Döring, J.; Wirowski, R.; Nicolay, N.; von Brentano, P.; Grawe, H.; Schubart, R.

Permalink: https://www.hzdr.de/publications/Publ-86

Transport treatment of an expanding pion gas in ultrarelativistic heavy ion collisions

Barz, H.-W.; Bertsch, G.; Danielewicz, P.; Schulz, H.; Welke, G. M.

  • Buch (Autorenschaft)
    "HOT AND DENSE NUCLEAR MATTER" Plenum Press (Konferenzbericht - Buch) New York, 1994, pp. 687

Permalink: https://www.hzdr.de/publications/Publ-85

Photovoltaik-Experimentierfeld im Forschungszentrum Rossendorf

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

Abstract

Im Institut für Sicherheitsforschung des Forschungszentrums Rossendorf wurde ein Photovoltaik-Experimentierfeld in Betrieb genommen. Die Anlage, die der Durchführung von wissenschaftlichen Begleituntersuchungen zum Bund-Länder-1000-Dächer-Programm dient, besteht aus 3 Teilfeldern. Ein Strahlungsmeßfeld dient der Erfassung meteorologischer Parameter und der Bestimmung der Energieproduktion unterschiedlich geneigter und ausgerichteter Module. Eine netzgekoppelte Referenzanlage erlaubt die Untersuchung der Energieflüsse und Verlustquellen. Im Modulfeld werden der effektive Wirkungsgrad bzw. die Energieproduktion von derzeit 13 unterschiedlichen Modulen in Abhängigkeit von Einstrahlung und Temperatur gemessen. Zur Durchführung der Messungen und Datenauswertung wurden spezielle Hard- und Softwarelösungen entwickelt.

  • ELEKTRIE 48 (1994), S.31

Permalink: https://www.hzdr.de/publications/Publ-84

Transverse momentum dependence of dileptons from parton matter produced in ultrarelativistic heavy-ion collisions

Kämpfer, B.; Pavlenko, O. P.

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Permalink: https://www.hzdr.de/publications/Publ-83

The Deuteron Spin-Dependent Structure Function within an Effective Meson-Nucleon Theory

Kaptari, L. P.; Kazakov, K. Y.; Umnikov, A. Y.; Kämpfer, B.

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Permalink: https://www.hzdr.de/publications/Publ-82

Writing implantation with a high current density focused ion beam

Bischoff, L.; Hesse, E.; Panknin, D.; Skorupa, W.; Teichert, J.

Abstract

The Rossendorf Focused Ion Beam IMSA-100 was used for writing implantation of cobalt (E = 30 keV Co+ and 60 keV Co++; D = 0.5...5x1017 cm-2) at room temperature to form CoSi2 microstructures on silicon by ion beam synthesis. For that aim two types of Liquid Alloy Ion Sourses (LAIS) were developed. As implanted and annealed (600°C for 60 min and 1000°C for 30 min in N2 atmosphere) silicide structures were analysed by SEM, EDX and electrical measurments.

Permalink: https://www.hzdr.de/publications/Publ-80

Relaxation of radiation damages in silicon planar detectors

Schmidt, B.; Eremin, V.; Ivanov, A.; Strokan, N.; Verbitskaya, E.; Li, Z.

Abstract

The behaviour of radiation induced carbon related defects in high resistivity silicon detectors has been investigated. The defects were introduced by alpha-particle irradiation and the measurements were carried out by the DLTS-technique. The unusual defect behaviour consists in low temperature anealing, including self annealing at room temperature, of the interstitial carbon Ci with a simultaneous increase of the (Ci-Oi)-complex concentration. The kinetic parameters of the process have been determined from the increase of the Ci-centre concentration versus time. Tho annealing velocities have been observed, which ar due to different heat treatments during the detector fabrication process.

  • Beitrag zu Proceedings
    Conference Proceedings Vol. 46, "Large Scale Applications and Radiation Hardness of Semiconductor Detectors", SIF, Bologna, 1994
    DOI: 10.1063/1.357356
    Cited 19 times in Scopus

Permalink: https://www.hzdr.de/publications/Publ-79

Selforganization and Disorder in on Open Quantum System

Müller, M.; Rotter, I.; Iskra, W.

  • Acta Physica Polonica 25 (1994) pp. 711

Permalink: https://www.hzdr.de/publications/Publ-78

Untersuchungen zur Strukturbildung bei der Hydratation von Zement

Hempel, A.; Hempel, M.; Häußler, F.; Eichhorn, F.; Baumbach, H.

  • Vortrag (Konferenzbeitrag)
    Arbeitstreffen des Verbundes "Forschung mit Neutronen" 18.-20.10.1993 in Benediktbeuren

Permalink: https://www.hzdr.de/publications/Publ-77

Workshop on a Project for a FZR-Beam Line at ESRF

Matz, W.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-24 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-76

A note on the force on an accelerating spherical drop at low Reynolds-number

Galindo, V.; Gerbeth, G.

Abstract

The time-dependent drag force on a spherical drop is analyzed for the linear limit of small Reynolds numbers. There is an error in the literature on the generalization of the known Basset memory kernel of a rigid sphere to the case of a drop. Correct results are presented here. A new overshooting effect is found if thermocapillarity is driving the drop motion rather than gravity.

Permalink: https://www.hzdr.de/publications/Publ-74

Unsteady Thermocapillary Migration of Isolated Spherical Drops in a Uniform Temperature Gradient

Galindo, V.; Gerbeth, G.

Abstract

A theoretical analysis of liquid drop unsteady migration under microgravity conditions is presented, for the case of an interfacial tension gradient on the drop surface generated by a uniform temperature gradient in the surrounding liquid. The effect of buoyancy due to a residual gravity vector aligned parallel to the temperature gradient is included. The relevant equations are solved in the creeping flow limit where in the convective transport of momentum as well as that of the energy is neglected, i.e. at low Reynolds and Marangoni numbers. The flow and the temperature field within and around the drop are obtained after transforming the results from the Laplace domain, in which they are derived, to the time domain. The time transient behaviour of the migration speed depends strongly on the choice of the initial flow and temperature fields.

  • Microgravity Science and Technology 7(1994)3, 234-241
    ISSN: 0938-0108

Permalink: https://www.hzdr.de/publications/Publ-73

Numerische Untersuchungen zum mechanischen Schwingungsverhalten einer nassen LVD-Lanze

Altstadt, E.; Weiß, F.-P.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-20 (nicht öffentlich)
    ISSN: 1436-3976
  • Open Access Logo Forschungszentrum Rossendorf; FZR 19 1993
    ISSN: 1436-3976

Permalink: https://www.hzdr.de/publications/Publ-72

High Concentrated [99mTc] Pertechnetate Solutions from (n,y) 99Mo/99mTc Generators for Nuclear Medical Use

Seifert, S.; Wagner, G.; Eckardt, A.

  • Applied Radiation and Isotopes 45 (1994) 5, pp. 577-579

Permalink: https://www.hzdr.de/publications/Publ-71

Preparation and Characterization of Ultrathin Crystalline Silicon Membranes

Schmidt, B.; von Borany, J.

Permalink: https://www.hzdr.de/publications/Publ-69

Experience of Installation and Optimization of the VIKTORIA-Code

Funke, H.; Kunicke, M.

  • Vortrag (Konferenzbeitrag)
    European Convex Users Conference, 27.-29.10.1993, Bilbao, Spanien

Permalink: https://www.hzdr.de/publications/Publ-67

Thermal diffuse Scattering in SrX BA1-X Nb2O6

Prokert, F.; Savenko, B. N.

  • Poster
    Arbeitstreffen des Verbundes Forschung mit Neutronen vom 18.-20.10.1993 in Benediktbeuern

Permalink: https://www.hzdr.de/publications/Publ-66

The effect of post-treatment of diamond-like carbon films with high energy ion beams

Kolitsch, A.

  • Vortrag (Konferenzbeitrag)
    Diamond-Conference, Sept. 1993 in Portugal

Permalink: https://www.hzdr.de/publications/Publ-65

Electrical effects of residual defects in Si after high energy implantation of Ge+ ions and annealing

Kögler, R.; von Borany, J.; Panknin, D.; Skorupa, W.

Permalink: https://www.hzdr.de/publications/Publ-63

Experimental Errors in Quantitative Texture Analysis from Diffraction Pole Figures

Mücklich, A.; Klimanek, P.

Abstract

After a brief discussion of the meaning of diffraction pole figures due to polycrystals the main sources of statistical and physical errors in quantitative texture analysis are analysed. The essential influence of the microcopical architecture (lattice perfection of the crystallites, grain sice and orientation distribution) of the sample material on the results of texture analysis is demonstraded. Possibilities of an estimation of errors by computer simulation or of correction by applying of useful correction methods are pointed out.

  • Materials Science Forum Vol. 157-162 (1994) pp. 275-286

Permalink: https://www.hzdr.de/publications/Publ-62

Positron emission tomography for dose localization and beam monitoring in light ion tumour therapy.

Enghardt, W.; Hasch, B.-G.; Manfraß, P.; Pawelke, J.; Sobiella, M.; Blochberger, P.; Friedrich, A.; Geißel, H.; Irnich, H.; Kraft, G.; Magel, A.; Münzenberg, G.; Nickel, F.; Poppensieker, K.; Schall, I.; Schardt, D.; Scheidenberger, C.; Voss, B.; Ziegler, C.

  • Poster
    Medical Physics '93, 22-24 Sep 1993, Puerto de la Cruz, Tenerife, Spain
    Book of Abstracts(1993)F-218
    Proceedings, Vol. 2(1993)321-324
  • Beitrag zu fremdem Sammelwerk
    Medical Physics '93, 22-24 Sep 1993, Puerto de la Cruz, Tenerife, Spain
    Book of Abstracts(1993)F-218
    Proceedings, Vol. 2(1993)321-324

Permalink: https://www.hzdr.de/publications/Publ-60

Probing early parton kinetics by photons, dileptons and charm

Kämpfer, B.; Pavlenko, O. P.

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Permalink: https://www.hzdr.de/publications/Publ-59

Self-Consistent Solutions of the Semibosonized Nambu & Jona-Lasinio Model

Wünsch, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-18
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-58

Analytical and experimental investigations for modelling the fluid-strukture-interaction in annular gaps

Grunwald, G.; Altstadt, E.

Abstract

Modelling the mechanical vibrations of pressurized water reactor internals the fluid-structure-interaction is to be taken into account. Especially at VVER-440 reactors there is a strong influence of the fluid due to the specific geometry. The intention of the presentation is to provide a solution of the continuity and the Navier-Stokes equations for the special case of a narrow annular gap geometry considering the fluid friction.
To obtain an analytical solution for these coupled 3D partial differential equations further assumptions and simplifications must be made:

  • the width of the annular gap is small compared with the diameter,
  • displacements of the mechanical structure are small compared with the gap width
  • the fluid flow velocity components are independent on the radius.
Keeping these assumptions in mind one can reduce the dimension of the continuity equation from 3D to 2D by averaging over the gap width.
Two elementary types of motion of the cylinder are considered: parallel displacement and pendular motion. By superimposing these elementary types even more general motions can be described.
In practice the application could be meaningful for core barrel motion at LWRs in general and for flow induced vibrations of control elements at VVER-440 reactors.
The analytical results are compared with experimental ones from a cylindrical pendulum setup. The criteria of comparison are the eigenfrequency and the damping of the pendulum in the static and flowing fluid. There is a good agreement between analytical and experimental results. Especially the strong influence of the chosen boundary condition upon the pressure equations can be shown.
  • Vortrag (Konferenzbeitrag)
    IMORN-24 (Informal Meeting on Reactor Noise), Oybin / Germany, 23 - 25 June 1993

Permalink: https://www.hzdr.de/publications/Publ-57

Anwendung der Positronen-Emissions-Tomographie für die Kontrolle der Tumortherapie mit leichten Ionen.

Enghardt, W.; Hasch, B.-G.; Manfraß, P.; Pawelke, J.; Sobiella, M.; Blochberger, P.; Friedrich, A.; Geißel, H.; Irnich, H.; Kraft, G.; Magel, A.; Meufels, W.; Münzenberg, G.; Nickel, F.; Poppensieker, K.; Schall, I.; Schardt, D.; Scheidenberger, C.; Voss, B.; Ziegler, C.

Abstract

kein Abstrakt

  • Vortrag (Konferenzbeitrag)
    24. Wissenschaftliche Tagung der Deutschen Gesellschaft für Medizinische Physik e.V. 20-23 Okt, 1993, Erlangen
    Tagungsband (1993) 254-255
  • Beitrag zu Proceedings
    24. Wissenschaftliche Tagung der Deutschen Gesellschaft für Medizinische Physik e.V. 20-23 Okt, 1993, Erlangen
    Tagungsband (1993) 254-255

Permalink: https://www.hzdr.de/publications/Publ-55

Beschreibung der Software zur Gewinnung und Bearbeitung von Bilddaten der Mikrostrahlanlage IMSA-100

Wagenaar, E. J.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-17
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-54

Acoustic Leak Detection at Complicated Geometrical Structures Using Fuzzy Logic and Neural Networks

Hessel, G.; Schmitt, W.; Weiß, F.-P.

Abstract

Methods of acoustic leak monitoring are of great practical interest for the safety of pressure vessels and pipe lines not only at the primary circuit of nuclear power plants. In this report some aspects of acoustic leak localization at complicated three-dimensional topologies for the case of leakage monitoring at the reactor vessel head of a VVER-440 are discussed.
An acoustic method based on pattern recognition is being developed. During the learning phase, the localization classifier is trained with sound patterns that are generated with simulated leaks at all locations endangered by leak. After training unknown leak positions can be recognized through comparison with the training patterns.
The sound patterns of the simulated leaks are simultaneously detected with an AE-sensor array and with high frequency microphones measuring structureborne sound and airborne noise, respectively.
The initial results show the used classifiers principally to be capable of detecting and locating leaks, but they also show that further investigations are necessary to develop a reliable method.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-21 October 1993, pp 1-14
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-51

Electrical and Optical Properties of ß-FeSi2 after Co Implantation and Annealing

Panknin, D.; Eichhorn, F.; Wieser, E.; Skorupa, W.; Henrion, W.; Albrecht, J.

  • Nuclear Instruments and Methods B 84 (1994), 172

Permalink: https://www.hzdr.de/publications/Publ-50

Determination of Inorganic Species in Trickle Water of Uranium-Mining Rockpiles as well as in Related Media

Thieme, M.; Geipel, G.

  • Beitrag zu fremdem Sammelwerk
    und Poster bei 5th Conf. Separation of Ionic Solutes SIS '93, Stara Lesna, 27.9.-1.10.1993)

Permalink: https://www.hzdr.de/publications/Publ-49

Results of a three-dimensional hexagonal kinetic benchmark problem

Kereszturi, A.; Telbisz, M.; Grundmann, U.; Krell, J.

Abstract

The recent safety analysis investigations of the VVER type reactors require the use of three-dimensional hexagonal kinetic codes. For this purpose the codes KIKO3D and DYN3D were developed in the Atomic Research Institute Budapest and in the Research Center Rossendorf, respectively. The kinetic codes have to be validated before being used for safety assessments. A benchmark problem is defined, as the first step of the validation procedure of hexagonal kinetic programs.
The problem describes a rod ejection transient in a VVER-type geometry, where the worth of the ejected rod is just below the prompt critical value. The initial power is near to zero and the power rise is not too large. Therefore, the transient can be treated without feedback based on given the time-dependence of the cross sections and geometry.
KIKO3D results are presented, i.e the solution of time dependent nodal equations by the Improved Quasistatic (IQS) Method. The time dependence of the integrated power and the reactivity are compared with the adiabatic results. These results are also compared with the results of two different DYN3D calculations carried out in Rossendorf and in Berlin.

  • Vortrag (Konferenzbeitrag)
    ENS Regional Meeting in Portoroz 1993 "Nuclear Energy in Central Europe: Present and Perspectives"

Permalink: https://www.hzdr.de/publications/Publ-48

Design of an achromatic mass separator for a focused ion beam system

Teichert, J.; Tiunor, M. A.

Abstract

The design of an achromatic mass separator which consists of two ExB filters, a stigmator, and the separation aperture is descibed. The optical properties of the ExB filters are derived. The influence of the designd mass are shown.

  • Beitrag zu fremdem Sammelwerk
    SPIE Vol 2014 Charged-Particle Optic (1993) 85
    DOI: 10.1117/12.155687

Permalink: https://www.hzdr.de/publications/Publ-47

Experimente zur Neutronenoptik perfekter Kristalle

Eichhorn, F.

  • Vortrag (Konferenzbeitrag)
    Fachbereich Physik der Universität Osnabrück am 1.7.1993

Permalink: https://www.hzdr.de/publications/Publ-46

Physical Aspects of Precise Spectrometry of alpha-particles with pn-Junction Detetors

Verbitskaya, E.; Eremin, V.; Strokan, N.; Kemmer, J.; Schmidt, B.; von Borany, J.

Abstract

Investigations of energy and charge losses have been carried out for silicon planar alpha-particle detectors. The detectors were manufactured by an advanced technology, using ion implantation and various anealing temperatures. A deteiled analysis of the recombination processes in alpha-particle tracks with a high electron-hole density and a measurement procedure for the main parameters of charge carrier loss have been developed. The procedure consists in the measurement of the pulse amplitude deficit as a function of the reverse bias voltage and the tilting angle as well as in a special treatment for the determination of carrier lifetimes, surface recombination velocities and dead layers. The experimental data show a reduction of the dead leyer to 200 A, and of the energy resolution to 9-9.5 keV. The explanation implies possible changes of the doping profile due to acceptor diffusion under thermal treatment and the corresponding modification of the built-in field in the p+-layer. This effect suppresses the surface and Auger recombination of non-equilibrium carriers in tracks of alpha-particles.

  • Nuclear Instruments and Methods in Physics Research B 84 (1994) 51-61

Permalink: https://www.hzdr.de/publications/Publ-45

Ion Beam Induced Amorphization and Epitaxial Crystallization of 6H-SiC

Heera, V.; Kögler, R.; Skorupa, W.; Glaser, E.; Bachmann, T.

  • Poster
    ECAART '93, Orleans, France

Permalink: https://www.hzdr.de/publications/Publ-44

Electrochemical Etch Stop Behaviour on Ion Implanted Silicon pn-Junctions

Schmidt, B.

  • Vortrag (Konferenzbeitrag)
    Micro System Technologies Russia, 21.-24 Juni 1993, St. Petersburg

Permalink: https://www.hzdr.de/publications/Publ-43

Simulation of high-dose ion implantation-induced transient diffusion and of electrical activation of boron in crystalline silicon

Jäger, H.-U.

  • Beitrag zu fremdem Sammelwerk
    Simulation of Semiconductor Devices and Processes, vol. 5, editors: S. Selberherr, H. Stippel and E. Strasser, Springer-Verlag Wien, 1993, p. 137-140
    DOI: 10.1007/978-3-7091-6657-4_33

Permalink: https://www.hzdr.de/publications/Publ-42

Investigations on Content and Distribution of Uranium and Radionuclides in an Early Wismut-Rockpile in Schlema

Geipel, G.; Thieme, M.; Bernhard, G.; Baraniak, L.

  • Poster
    Altlastensanierung 93, Berlin, Mai 1993

Permalink: https://www.hzdr.de/publications/Publ-41

Separation of Radionuclides from a fission product solutron by ionexchange on alumina

Bernhard, G.

Permalink: https://www.hzdr.de/publications/Publ-40

Selforganization in the Nuclear System: II. Formation of a New Order

Iskra, W.; Müller, M.; Rotter, I.

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Permalink: https://www.hzdr.de/publications/Publ-39

Fluidic microcell with sensor array in Si-glass technology

Pham, T.; Howitz, S.

  • Beitrag zu fremdem Sammelwerk
    Conf. Transducers 1993, Yokohama (Bearbeitung wird bis 4.6.93 abgeschlossen, danach Veröffentlichung mögl.)

Permalink: https://www.hzdr.de/publications/Publ-37

The Influence of Chemical Interactions between Fission Products and Wall Material on the Aerosol Behavior in a Thermal Gradient Tube

Funke, H.; Kourti, N.; Bieder, U.

  • Vortrag (Konferenzbeitrag)
    Konferenzbeitrag, European Aerosol Conference 1993

Permalink: https://www.hzdr.de/publications/Publ-36

Ein Vergleich zwischen assoziativen Korrelationsmatrizen und assoziativen Tensoren mit Bezug zur optimalen Signalschätzung

Hoppe, D.

  • Bericht, sonstiger
    Forschungszentrum Rossendorf; Laborbericht Mai 1993, Institut für Sicherheitsforschung

Permalink: https://www.hzdr.de/publications/Publ-35

Neutron and X-ray Investigations on the Oxigen Bonding in YBa2Cu30(7-x) combined with Physico-chemical Methods

Große, M.; Schuster, G.; Teske, K.; Anwand, W.; Henkel, K.

Abstract

The occupancy of the oxygen lattice positions at different annealing conditions in Yba2Cu3O(7-x) were determined by Rietveld refinements using neutron and X-ray diffraction data. The occupation density for the oxygen positions O1 to O4 were ascertained. The values of the oxygen content of the samples from this method were compared with those measured by thermoanalysis. The O1 and O4 oxygen atoms are exchangeable by thermal treatment. The oxygen in the planes is fixed and cannot be removed by thermal treatment up to 935oC. The binding strength of O1 in the lattice is stronger than that of O4 atoms; this is demonstrated by a higher temperature of dissociation of the O1 atoms. The amount of the oxygen taken up is not exactly equal to the oxygen actually in the lattice positions. In the temperature region below 400oC adsorption and chemisorption processes become dominant.

  • Fresenius Zeitschrift für Analyt. Chemie 349 (1994) 1-3 pp. 231-233
    DOI: 10.1007/BF00323290
  • Poster
    7. Tagung Festkörperanalytik, Chemnitz, 19. - 23. Juni 1993

Permalink: https://www.hzdr.de/publications/Publ-34

Thermochromatographische Experimente zur Oxidgaschemie von Molybdän und Wolfram

Hübener, S.

  • Vortrag (Konferenzbeitrag)
    2. Workshop, Chemie schwerster Elemente, Solothurn, Schweiz, 25.-27.5.1993

Permalink: https://www.hzdr.de/publications/Publ-33

Probleme bei der Durchführung und Auswertung von Thermochromatographie-Experimenten

Roß, A.

  • Vortrag (Konferenzbeitrag)
    2. Workshop, Chemie schwerster Elemente, Solothurn, Schweiz, 25.-27.5.1993

Permalink: https://www.hzdr.de/publications/Publ-32

Theoretische Probleme bei der Auswertung von Thermochromatographie-Experimenten

Funke, H.

  • Vortrag (Konferenzbeitrag)
    2. Workshop, Chemie schwerster Elemente, 25.-27.5.1993, Solothurn, Schweiz

Permalink: https://www.hzdr.de/publications/Publ-31

Neutronic Problems of a Compact 14 MeV Plasma Neutron Source

Kumpf, H.; Noack, K.; Kramoperov, V. G.

Abstract

Neutronic problems connected with the design of a compact 14MeV neutron source for fusion material research based on a plasma mirror are treated. In particular it has been demonstrated, that further construction efforts are necessary to comply with the established radiation limits for the magnetic system. Further it ist not possible to raise the useful high energy flux by arranging reflectors. If one of the source areas of the machine is equipped with a moderator, a thermal neutron source with a flux of about 5 1014 n cm-2 s-1 can be achieved.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-11
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-30

Ein Einstufenverfahren zur Synthese von [1,2 14c] Trichloressigsäure, ausgehend von [1,2 14c] Natriumacetat

Bubner, M.; Herse, K.; Vlasakova, V.; Fuksova, K.

  • Vortrag (Konferenzbeitrag)
    3. Arbeitstagung des IIS, Bad Soden 1993

Permalink: https://www.hzdr.de/publications/Publ-29

A study of exicted states in 85 Kr and 86Kr: Evidence for neutron-core excitations in the N=50 nucleus 86Kr

Winter, G.; Schwengner, R.; Reif, J.; Prade, H.; Funke, L.; Wirowski, R.; Nicolay, N.; Dewald, A.; von Brentano, P.; Grawe, H.; Schubart, R.

Permalink: https://www.hzdr.de/publications/Publ-28

Modellexperimente zur gaschemischen Charakterisierung des Elementes 106

Hübener, S.; Roß, A.

  • Vortrag (Konferenzbeitrag)
    Seminar des Institutes für Kernchemie der J.-Gutenberg-Universität Mainz, 21.04.1993

Permalink: https://www.hzdr.de/publications/Publ-27

Photon production in an expanding gluon-enriched plasma

Kämpfer, B.; Pavlenko, O. P.

Abstract

Photon production in an expanding gluon plasma with initially little quark admixture
is considered. Photons are created by lowest order a, processes which include quarks.
Chemical equilibration of the quarks in turn is followed by rate equations which rely on lowest order αsgg = qq processes. Expansion slows down the quark cooking. Compared with the standard local equilibrium estimates we find a drastic reduction of mediumenergy photons if the initial quark admixure is below 20% of the chemical saturation density. Higher initial temperatures increase significantly the high-energy photon yield and overcompensate this reduction.

  • Open Access Logo Forschungszentrum Rossendorf; FZR 93-09 Preprint
    ISSN: 1436-3976
  • Jadernaja fizika 58, (1995), 2260-2265
  • Phys. Atom. Nucl. 58, (1995), 2144-2149

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Permalink: https://www.hzdr.de/publications/Publ-25

Untersuchungen zu natürlich-radioaktiven Inhaltsstoffen in Berghalden des Wismutbergbaus in Schlema

Geipel, G.; Thieme, M.; Bernhard, G.; Baraniak, L.

  • Vortrag (Konferenzbeitrag)
    Hauptversammlung der GDCh Hamburg

Permalink: https://www.hzdr.de/publications/Publ-24

Seiten: [1.] [2.] [3.] [4.] [5.] [6.] [7.] [8.] [9.] [10.] [11.] [12.] [13.] [14.] [15.] [16.] [17.] [18.] [19.] [20.] [21.] [22.] [23.] [24.] [25.] [26.] [27.] [28.] [29.] [30.] [31.] [32.] [33.] [34.] [35.] [36.] [37.] [38.] [39.] [40.] [41.] [42.] [43.] [44.] [45.] [46.] [47.] [48.] [49.] [50.] [51.] [52.] [53.] [54.] [55.] [56.] [57.] [58.] [59.] [60.] [61.] [62.] [63.] [64.] [65.] [66.] [67.] [68.] [69.] [70.] [71.] [72.] [73.] [74.] [75.] [76.] [77.] [78.] [79.] [80.] [81.] [82.] [83.] [84.] [85.] [86.] [87.] [88.] [89.] [90.] [91.] [92.] [93.] [94.] [95.] [96.] [97.] [98.] [99.] [100.] [101.] [102.] [103.] [104.] [105.] [106.] [107.] [108.] [109.] [110.] [111.] [112.] [113.] [114.] [115.] [116.] [117.] [118.] [119.] [120.] [121.] [122.] [123.] [124.] [125.] [126.] [127.] [128.] [129.] [130.] [131.] [132.] [133.] [134.] [135.] [136.] [137.] [138.] [139.] [140.] [141.] [142.] [143.] [144.] [145.] [146.] [147.] [148.] [149.] [150.] [151.] [152.] [153.] [154.] [155.] [156.] [157.] [158.] [159.] [160.] [161.] [162.] [163.] [164.] [165.] [166.] [167.] [168.] [169.] [170.] [171.] [172.] [173.] [174.] [175.] [176.] [177.] [178.] [179.] [180.] [181.] [182.] [183.] [184.] [185.] [186.] [187.] [188.] [189.] [190.] [191.] [192.] [193.] [194.] [195.] [196.] [197.] [198.] [199.] [200.] [201.] [202.] [203.] [204.] [205.] [206.] [207.] [208.] [209.] [210.] [211.] [212.] [213.] [214.] [215.] [216.] [217.] [218.] [219.] [220.] [221.] [222.] [223.] [224.] [225.] [226.] [227.] [228.] [229.] [230.] [231.] [232.] [233.] [234.] [235.] [236.] [237.] [238.] [239.] [240.] [241.] [242.] [243.] [244.] [245.] [246.] [247.] [248.] [249.] [250.] [251.] [252.] [253.] [254.] [255.] [256.] [257.] [258.] [259.] [260.] [261.] [262.] [263.] [264.] [265.] [266.] [267.] [268.] [269.] [270.] [271.] [272.] [273.] [274.] [275.] [276.] [277.] [278.] [279.] [280.] [281.] [282.] [283.] [284.] [285.] [286.] [287.] [288.] [289.] [290.] [291.] [292.] [293.] [294.] [295.] [296.] [297.] [298.] [299.] [300.] [301.] [302.] [303.] [304.] [305.] [306.] [307.] [308.] [309.] [310.] [311.] [312.] [313.] [314.] [315.] [316.] [317.] [318.] [319.] [320.] [321.] [322.] [323.] [324.] [325.] [326.] [327.] [328.] [329.] [330.] [331.] [332.] [333.] [334.] [335.] [336.] [337.] [338.] [339.] [340.] [341.] [342.] [343.] [344.] [345.] [346.] [347.] [348.] [349.] [350.] [351.]