Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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42458 Publications

Surface Light Scattering Spectroscopy of the Gallium Liquid-Vapor Interface

Kolevzon, V.

Abstract

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

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

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

Institute of Bioinorganic and Radiopharmaceutical Chemistry; Annual Report 1995

Johannsen, B.; Seifert, S.

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

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

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

Hessel, G.; Schmitt, W.; Weiß, F.-P.

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

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

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

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

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

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

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

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

Abstract

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

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

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

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

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

  • Inorganica Chimica Acta 255 (1997) 399-403

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

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

Hollstein, F.

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

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

40-kWp-Potovoltaikanlage Kirnitzschtalbahn

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

Abstract

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

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

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

Betriebsverhalten von netzgekoppelten Photovoltaikanlagen aus dem 1000-Dächer-Programm

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

Abstract

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

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

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

A Fast and Precise Generating Voltmeter

Bürger, W.

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

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

Investigations of ion implanted iron silicide layers after annealing and irradiation

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

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

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

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

Scheurer, S.

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

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

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

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

Abstract

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

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

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

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

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

Abstract

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

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

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

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

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

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

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

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

Kumpf, H.; Noack, K.

Abstract

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

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

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

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

Brutscher, J.

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

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

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

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

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

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

Abstract

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

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

Sources of radiochemical impurities in the 99mTc/S-unprotected MAG3 system

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

Abstract

With the aim of obtaining a general insight into the technetium/S-unprotected MAG3 system, the reactions of technetium with the unprotected MAG3 ligand, both at c.a.- and n.c.a.-level, were investigated. Based on a profound knowledge of the reaction route and the Tc-MAG3 complexes, sources of by-products were identified and eliminated as far as possible. Only a small percentage (< 5%) of intermediate Tc-MAG3 complexes occurs, but this may increase by improper handling of the kit, such as insufficient reaction time. In conclusion, two kinds of impurity may occur in the Tc/MAG3 kit: One is derived from impurities in the ligand (MAG3 disulphide), which can be excluded by careful preparation and storage. The other is caused by insufficient reaction time according to the scheme (Fig. 3) during the labelling procedure. Its content can be minimized by optimization of the reaction time. A reaction time of at least 10 minutes gives about 98% of the renal agent.

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

Fernüberwachung ukrainischer Kernkraftwerke

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

Abstract

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

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

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

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

Schülke, A.

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

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

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

Jäger, H.-U.

Abstract

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

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

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

CEMS and AES Investigations on Iron Silicides

Reuther, H.; Dobler, M.

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

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

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

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

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

Resonance phenomena near thresholds

Persson, E.; Müller, M.; Rotter, I.

Abstract

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

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

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

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

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

Abstract

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

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

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

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

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

Abstract

Abstract

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

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

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

Langzeitmeßprogramm "1000-Dächer-Programm"

Rindelhardt, U.; Teichmann, G.

Abstract

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Grundmann, U.

Abstract

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

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

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

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

Böhmert, J.; Törrönen, K.; Valo, M.

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

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

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

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

Abstract

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

Abstract

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

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

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

Erweitertes Überwachungsprogramm der Strahlenversprödung durch Probenrekonstitution

Viehrig, H.-W.; Böhmert, J.

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

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

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

Gabriel, F.

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

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

Ionenstrahlsynthese von Nanoclustern

Schmidt, B.

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

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

Diffuse scattering of neutrons in thermally oxidized silicon

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

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

Berechnung von Neutronenflußdichteschwankungen in WWER-Druckwasserreaktoren infolge strömungsinduzierter Schwingungen

Hollstein, F.

Abstract

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

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

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Dielektrische Theorie des elektronischen Energieverlustes schwerer Ionen in Festkörpern

Mathar, R. J.

  • Other report
    Dissertation

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

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

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

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

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

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

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

Abstract

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

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

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

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

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

  • Other report
    Institutsbericht

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

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

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

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

Ion Beam Surface Treatment of Biomaterials

Pham, T.

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

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Optimization on Rugged Landscapes: A Democratic Approach

Dittes, F.-M.

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

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

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

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

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

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

Abstract

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

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

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Shell-Model Study of Shears Bands in Light Pb Nuclei

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

Abstract

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

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

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

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

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

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

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

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

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

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

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

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

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

Cluster beams from a Co-Nd liquid alloy ion source

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

Abstract

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

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

Hadron Production in pBe interactions at 14.6 GeV/c

Müller, H.

Abstract

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

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

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

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

Schmitt, W.; Steiff, A.

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

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

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

Rindelhardt, U.

Abstract

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

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

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

Identification of Topics for Cooperation between the European Community and Eastern European Countries in the Field of Nuclear Reactor Safety, Radioactive Waste and Site Restoration

Weiß, F.-P.; Valko, J.

  • Contribution to external collection
    Study accomplished by order of EU DG XII, Rossendorf, 1995

Permalink: https://www.hzdr.de/publications/Publ-441

Fuzzy-based Acoustic Leak Localization at Complicated Structures

Hessel, G.; Schmitt, W.; Weiß, F.-P.

Abstract

A method for detecting and localizing leaks at complicated three-dimensional topolo-gies by measuring the leak induced structure-borne sound and by applying fuzzy pattern classification procedures has been developed. The sound patterns necessary to train the fuzzy pattern classifier are generated with simulated leaks at the original structure. RMS-values of acoustic emission sensors are used as features for char-acterizing the occurrence and the location of a leak. Fuzzy pattern classification is applied for check and calibration of the sensor lines and for leak localization as well. Several types of neural networks and the fuzzy pattern classification are compared concerning the capabilities of classification.

  • Lecture (Conference)
    Proc. of the Third European Congress on Intelligent Techiques and Soft Computing EUFIT'95, Aachen, August 28-31, 1995, pp. 1165 - 1169
  • Contribution to proceedings
    Proc. of the Third European Congress on Intelligent Techiques and Soft Computing EUFIT'95, Aachen, August 28-31, 1995, pp. 1165 - 1169

Permalink: https://www.hzdr.de/publications/Publ-440

Akustische Lecküberwachung mit Neuronalen Netzen an Druckanlagen komplizierter Topologie

Hessel, G.; Schmitt, W.; Weiß, F.-P.

  • Contribution to proceedings
    DECHEMA-Jahrestagung '95, Wiesbaden, 30.5.-1.6.1995, Band 3, S. 227-228

Permalink: https://www.hzdr.de/publications/Publ-438

A Finite Element Based Vibration Model for VVER-440 Type Reactors Considering the Fluid-Structure-Interaction

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

  • Lecture (Conference)
    Jahrestagung Kerntechnik 1995
  • Contribution to proceedings
    Proc. Jahrestagung Kerntechnik '95, Nürnberg, 16. - 18. Mai 1995, S. 227 - 230

Permalink: https://www.hzdr.de/publications/Publ-437

Übersicht zu Arbeiten des Institutes für Sicherheitsforschung des FZR

Weiß, F.-P.

  • Lecture (Conference)
    Seminarvortrag, Institut für Reaktorsicherheit im FZK, Karlsruhe, 23. Februar 1995

Permalink: https://www.hzdr.de/publications/Publ-436

Analysis of hard two-photon correlations measured in heavy-ion reactions at intermediate energies

Barz, H.-W.; Kämpfer, B.; Wolf, S.; Bauer, W.

Abstract

Analysis of hard two-photon correlations
measured in heavy-ion reactions at intermediate energies

H.W.Barz1,2, B.Kämpfer1,2, GY. Wolf3,4, W. Bauer5

1Institut für Kern- und Hadronenphysik, FZ Rossendorf,
PF 510119, 01314 Dresden, Germany
1Institut für Theoretische Physik, TU Dresden,
Momrnsenstr. 13, 01062 Dresden, Germany
3GSI Darmstadt, PF 110552, 64220 Darmstadt, Germany
4KFKI RMKI Budapest, POB. 49, H-1525 Budapest, Hungary
MSU Michigan, East Lansing, MI 48824, USA

Abstract

Recently reported measurements of hard photon correlations in the reactions 36Ar On 27Al at 95 A*MeV, 86Kr on natNi at 60 A*MeV, and 181Ta on 197Au at 39.5 A*MeV are analyzed. A Boltzmann-Ühling-Uhlenbeck transport model is used to describe the photon production by individual nucleon-nucleon collisions. In the lighter systems we find the best agreement with data when taking into account only the photons from first chance collisions of nucleons or photons produced during the Passage of the nuclei, while the model predicts also a considerable late-time emission of photons which leads to a depletion of the calculated correlation function. The accuracy of the present data daas not allow firm conclusions on the reliability of this late time evolution. Our inveatigatiions do not support a recently reported interference pattern in the heavy Ta + Au system.

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Spectroscopy of correlated fragments from the fission of hot nuclei performed at the FOBOS 4pi - array

Ortlepp, H.-G.; Wagner, W.; Dietterle, S.; Dshemuchadse, S.; Doronin, V. N.; Ivanovsky, S. I.; Kamanin, D. V.; Aleksandrov, A. A.; Aleksandrova, I. A.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-102 Preprint
    ISSN: 1436-3976

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Optimierung einer Bragg-Ionisationskammer

Gebhardt, M.

  • Other report
    Diplomarbeit

Permalink: https://www.hzdr.de/publications/Publ-431

The effect of conditioned medium of porcine astrocytes and different cell lines on the activity of the marker enzymes ALP and Gamma-GT in endothelial cells of the porcine brain microvessels

Ahlemeyer, B.; Matys, S.; Brust, P.

  • Contribution to proceedings
    Cerebrovask. Konferenz, Paris 1995
  • Book (Authorship)
    Biology and Physiology of the Blood-Brain Barrier, ed. by Couraud and Scherman, Plenum Press, New York, 1996, pp. 229-233

Permalink: https://www.hzdr.de/publications/Publ-430

Blood-Brain Barrier properties in vitro as related to the neurotransmitter serotonin

Brust, P.; Matys, S.; Wober, J.; Friedrich, A.; Bergmann, R.; Ahlemeyer, B.

  • Contribution to proceedings
    Cerebrovask. Konferenz, Paris 1995
  • Book (Authorship)
    Biology and Physiology of the Blood-Brain Barrier, edit. by Couraud, Pierre-Olivier and Scherman, Plenum Press, New York, 1996

Permalink: https://www.hzdr.de/publications/Publ-429

The influence of ion energy on the wear behaviour of titanium-implanted silicon nitride ceramics

Brenscheidt, F.; Fischer, W.; Matz, W.; Wieser, E.

Permalink: https://www.hzdr.de/publications/Publ-427

Influence of high dose and high Energy Oxygen implantation on the mechanical surface properties of aluminium

Wieser, E.; Schöneich, J.; Richter, E.

Permalink: https://www.hzdr.de/publications/Publ-426

Growth and Characterization of Boron Nitride Thin Films

Plass, M.; Fukarek, W.; Kolitsch, A.; Kreißig, U.

Permalink: https://www.hzdr.de/publications/Publ-425

Post-ion-implantation into amorphous carbon films

Kolitsch, A.; Sümmchen, L.; Ullmann, I.; Falke, U.; Heger, P.

Permalink: https://www.hzdr.de/publications/Publ-424

Neutron Diffraction Study of Phase Transitions in the Mixed Crystal Sr0.7Ba0.3Nb2O6 Between 20 and 300 K

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

Permalink: https://www.hzdr.de/publications/Publ-422

Ion Beam Synthesis by High Dose Tungsten Implantation into 6H-Silicon Carbide

Weishart, H.; Matz, W.; Skorupa, W.

  • Contribution to external collection
    IC SCRM 95 in Kyoto, Japan, 18.-21.9.1995
  • Book (Authorship)
    Institute of Physics Conference Series 142(1996)3, 541-544, Silicon Carbide and Related Materials 1995 Conf., Kyoto, Japan, c 1996 IOP Pub.

Permalink: https://www.hzdr.de/publications/Publ-421

Study of the different stages of damage induced by 200 keV Ge+ ion implantation in 6H-SiC

Pacaud, Y.; Brauer, G.; Perez-Rodriguez, A.; Stoemenos, J.; Barklie, R.; Voelskow, M.; Skorupa, W.

  • Contribution to external collection
    IC SCRM 1995, Kyoto, Japan, IOP Publishing

Permalink: https://www.hzdr.de/publications/Publ-420

Focused ion beam sputtering yield measurements for cobalt ions on silicon and related materials

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

Abstract

The sputtering yield of crystalline, amorphous, and poly-silicon, as well as SiO2 and SiC, was investigated for 35 keV Co+ focused ion beam irradiation using the volume loss method. The sputtered holes were analysed by SEM and surface profiling. For crystalline silicon targets, the sputtering yield was determined as a function of the incident angle of the ions and substrate temperature.

Permalink: https://www.hzdr.de/publications/Publ-419

Comparative Study of SIMOX Structures Using Four Analytical Techniques

Fukarek, W.; Yankov, R. A.; Skorupa, W.

Permalink: https://www.hzdr.de/publications/Publ-418

Investigation of crack growth processes of surface-breaking cracks by ultrasound - Comparison of simulation and experiments

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

  • Poster
    1995 World Congress on Ultrasonics, Berlin, 3.-7. September 1995
  • Contribution to proceedings
    Proc. 1995 World Congress of Ultrasonics, Berlin 3. - 7. September 1995, Part 2, p. 601

Permalink: https://www.hzdr.de/publications/Publ-416

Local properties of a Hg/N2 bubbly flow injected by a single orifice in a longitudinal magnetic field

Kljukin, A.; Kolesnikov, Y.; Lielausis, O.; Platacis, E.; Skopis, M.; Eckert, S.; Gerbeth, G.

  • Lecture (Conference)
    Int. Riga Conference on MHD, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-415

Stabilisation of thin liquid metal jets by magnetic field

Bucenieks, I.; Lielausis, O.; Gerbeth, G.; Falk, F.

  • Lecture (Conference)
    Int. Riga Conference on MHD, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-414

Measurements of longitudinal velocity fluctuations in liquid sodium at high interaction parameters in a channel with conducting walls

Eckert, S.; Gerbeth, G.; Langenbrunner, H.; Witke, W.

  • Lecture (Conference)
    Int. Riga Conference on MHD, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-413

Testing of a new experimental technique to study MHD-Associated phenomena with free liquid metal surface

Bojarevics, A.; Gelfgat, Y. M.; Gerbeth, G.

  • Lecture (Conference)
    Int. Riga Conference on MHD, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-412

Gradient freeze crystal growth with optimized convection induced by a rotating magnetic field

Buhrig, E.; Wunderwald, U.; Gerbeth, G.; Gelfgat, Y. M.; Gorbunov, L.

  • Lecture (Conference)
    Int. Riga Conference on MHD, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-411

Two-phase flow behaviour during a medium size cold leg LOCA test on PMK-2 (IAEA - SPE-4)

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

Abstract

The experiment to the IAEA standard problem exercise No. 4 was carried out in April 1993 on the integral test facility PMK-2 in Budapest. It was a 3.2 mm break on the downcomer head. The high pressure injection cooling was assumed to be not available. As an accident management measure bleed and feed on the secondary side of the steam generator was applied. Research Center Rossendorf contributed to the experiment of SPE-4 by supplying needle shaped conductivity probes for the measurement of local void fractions in the primary circuit of the PMK-II test facility. In the course of the standard problem exercise No. 4 RCR contributed with posttest calculations using the thermalhydraulic code ATHLET.
The report comprises a description of the initial and boundary conditions of the test and a phenomenological description of the thermalhydraulic events during the transient. The void fraction probe signals yields valuable information for deeper understanding of the thermalhydraulic occurrences and for code validation. This was the case particularly for correction of the level measurement.
A description of the thermalhydraulic occurrences from the viewpoint of code verification is given and the results of RELAP5 (KFKI-AEKI) and of ATHLET-calculations (RCR) are compared. Referring to this description, the sensitivity of the result to main influences is investigated using the ATHLET-code.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-101 August 1995
    ISSN: 1436-3976

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In situ observation of the tip shape of Co-Ge liquid alloy ion sources in a high-voltage transmission electron microscope

Driesel, W.; Dietzsch, C.; Hesse, E.; Bischoff, L.; Teichert, J.

Abstract

For in situ observation in a 1 MeV TEM Co-Ge liquid alloy ion soures (LAISs) were mountet to a special specimen holder revealing the formation of the field-stabilizes Co-Ge liquid alloy cone, the change in the tip shape as a function of the ion emission current, spatial shifts of the liquid alloy cone, and microdroplet emission from Co-Ge LAISs. This has facilitated the better understanding of the ion and microdroplet emission process from Co-Ge LAISs in a large range of ion current. Below the onset voltage the shape of the tip covered with the liquid Co-Ge alloy is spherical. At the onset voltage the Tayler cone is formed. A jetlike protrusion at the cone vertex. The cone half-angle a decreases and the jet length l increases with increasing emission current le. Linear dependences of a and l on Ie are found. Emission of microdroplets is observed at the shanks behind the Tayler cone. The radius of microdroplets varied between 0.035 and 10 µm. These microdroplets are emitted in time intervals of about 0.1 s and more.

Permalink: https://www.hzdr.de/publications/Publ-409

Cobalt disilicide interconnects for micromechanical devices

Teichert, J.; Bischoff, L.; Hesse, E.; Schneider, P.; Panknin, D.; Geßner, T.; Löbner, B.; Zichner, N.

Abstract

A focused ion beam system working with 35 keV Co+ ions has been used to produce CoSi2 interconnects by means of ion beam synthesis. The capability of maskness patterning of the focused ion beam, ist large depth of focus and the possibility of a dynamic focus control allow the fabrication of interconnects in three-dimensional devices with this method. Investigations have been performed using polycrystalline, amorphous and single crystalline silicon substrates. The influence of implantation does has been studied, the electrical resistance and thermal stability of the interconnects has been measured. For room temperature implantation and annealing at 600°C for 1h resistivities between 34 and 60 µ( cm have been obtained for the various substrate materials. CoSi2 interconnects have been found to be thermally stable up to 700°C. In order to demonstrate this method interconnection lines have been fabricated on the sloped walls of deep anisotropically etched grooves 280 µm.

Permalink: https://www.hzdr.de/publications/Publ-408

X-ray diffraction study of phase transitions in Sr0.39 Ba0.61 Nb2O6 between 20 and 500K

Prokert, F.; Ihringer, J.; Ritter, H.

Permalink: https://www.hzdr.de/publications/Publ-407

The investigation of different cameras for in-beam PET imaging.

Pawelke, J.; Byars, L.; Enghardt, W.; Fromm, W.-D.; Geissel, H.; Hasch, B.-G.; Lauckner, K.; Manfraß, P.; Schardt, D.; Sobiella, M.

Abstract

In situ and in vivo treatment plan verification and beam monitoring as well as dose control during heavy-ion tumour therapy can be performed in principle by measurements of range distributions of positron-emitting nuclei by means of PET techniques. For this purpose the performance of different types of positron camera as well as the results of in-beam PET experiments using beams of positron-active ions (15O, 17F and 19Ne with energies of 300-500 AMeV) are presented. Following the deduced performance requirements a PET scanner that is designed for clinical use in experimental heavy-ion therapy at GSI Darmstadt has been built. This limited angle tomograph consists of two large-area detector heads based on position sensitive BGO detectors and is predicted to perform the measurement of the end point of a positron-emitting ion beam for the verification of a treatment plan with a precision better than 1 mm. The maximum dose applied in the patient thereby is of the magnitude of 10 mGy.

Permalink: https://www.hzdr.de/publications/Publ-406

Effects of nuclear Coulomb field on two-meson correlations

Barz, H.-W.

Abstract

Abstract:

The infiuence of the nuclear Coulombfield on two-pion and two-kaon correlations is investigated for sources with charge number of Z = 160. The source radii
extracted from the correlation function determined in sidewards and outwards direction are remarkably affected for meson pairs with average momenta, below 200 MeV/c.

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Influence of the first-order polarization on the stopping power for bare charges in the jellium model

Mathar, R. J.

Abstract

Adding the contribution of the next higher order of the density parameter to the random-phase approximation (the zeroth-order, noninteracting approximation to the subceptibility) improves the calculation of the linear dielectric function of the jellium model. In this paper, the corresponding results by Holas, Aravind, and Singwi (Phys. Rev. B20 (1979) 4912) are picked up to extend the Lindhard-Winter theory of the electronic energy loss in a straightforward manner. As known from static approximations to the local-field correction, the electronic stopping at low ion velocities is enhanced. Above the stopping-power maximum, the first-order dynamic dielectric function delivers a correction of the opposite sign.

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Forschungszentrum Rossendorf; Jahresbericht 1993/94

Fülle, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-100
    ISSN: 1436-3976

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Spontaneous fission of 244Cm studied by the two-velocities method at the FOBOS spectrometer

Kozulin, E. M.; Oganessian, Y. T.; u. a.; Aleksandrov, A. A.; Aleksandrova, I. A.; u. a.; Gippner, P.; Matthies, A.; Herbach, C.-M.; Schilling, K.-D.; u. a.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-99
    ISSN: 1436-3976

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Methodische Untersuchungen zum Einsatz der Positronen-Emissions-Tomographie in der Leichtionen-Tumortherapie.

Pawelke, J.

Abstract
  • Open Access Logo Dissertation, Technische Universität Dresden, Fakultät für Mathematik und Naturwissenschaften
    Forschungszentrum Rossendorf, FZR-97 (Juni 1995)
    ISSN: 1436-3976

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Evidence for a supershort fission mode in the reactions 242mAm(nth,f) and 244Cm(sf)

Pyatkov, Y. V.; Aleksandrov, A. A.; Andreev, B. I.; Gippner, P.; Herbach, C.-M.; Ortlepp, H.-G.; Penionzhkevich, Y. E.; Shekhmamet'Ev, R. A.; Wagner, W.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-98 Preprint
    ISSN: 1436-3976

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Erfolgsbilanz läßt Qualitätsansprüche steigen

Maletti, R.

  • Sonnenenergie & Wärmetechnik 1997, H.5, S.16

Permalink: https://www.hzdr.de/publications/Publ-397

Abhängigkeit der mechanischen Eigenschaften, des Bestrahlungs- und des Ausheilverhaltens von der Tiefenlage in Schmiedestücken des WWER-Reaktordruckbehälterstahles 15Ch2MFA

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

  • Open Access Logo Forschungszentrum Rossendorf; FZR-93 April 1995
    ISSN: 1436-3976

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Institute of Radiochemistry; Annual Report 1994

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

  • Open Access Logo Forschungszentrum Rossendorf; FZR-94
    ISSN: 1436-3976

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In-Beam Investigation and the Structur of States in 113Sn

Käubler, L.; Döring, J.; Funke, L.; Kleinwächter, P.; Prade, H.; Reif, J.; Schwengner, R.; Winter, G.; u. a.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-95 Preprint
    ISSN: 1436-3976

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Mixed-Ligand Oxorhenium(V) comlexes with Rhenium-Selenium bonds. Molecular structure of (3-Oxapentane-1.5-Dithiolato)-(Benzeneselenolato)Oxorhenium(V)

Fietz, T.; Spies, H.; Leibnitz, P.; Scheller, D.

Permalink: https://www.hzdr.de/publications/Publ-391

Bericht der Frühjahrstagung der Studiengruppe für Elektronische Instrumentierung vom 3. bis 5. April 1995 in Jülich

Gabriel, F.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-96
    ISSN: 1436-3976

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