Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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34121 Publications

Betriebserfahrungen mit einer 100-m2-Solaranlage zur Trinkwasserbereitung und Fernwärmeeinspeisung

Brünig, D.; Rindelhardt, U.

Die Ergebnisse des ersten zehn Betriebsmonate der Solaranlage Freital werden vorgestellt. Bei einem Kollektornutzungsgrad von 29% wurde ein Ertrag von 264 kWh/m² erreicht. Für das erste volle Betriebsjahr wird ein Wert von 327 kWh/m² erwartet. Mehr als 2/3 der erzeugten Solarwärme wurde in das Fernwärmenetz eingespeist, der Rest diente der Warmwasserbereitung einer Schule.

  • Lecture (Conference)
    5. Symposium Thermische Solarenergie, Staffelstein, 21.-26. Juni 1995, Tagungsband S.133
  • Contribution to proceedings
    5. Symposium Thermische Solarenergie, Staffelstein, 21.-26. Juni 1995, Tagungsband S.133

Permalink: https://www.hzdr.de/publications/Publ-356
Publ.-Id: 356


Ermittlung der Neutronendosis von bestrahlten WWER-Reaktordruckbehältermaterialien

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

In this report is described the theoretical and experimental determination of all needed parameters for the neutron exposure of the different specimens that were irradiated in the Rheinsberg reactor within the period from 1984 until 1988 to obtain data for neutron embrittlement studies.
The methodical approach is represented, possible sources of errors are discussed and all the needed results are collected. The work can be divided into a pure calculation part, into the description of the extraction of the monitors and their gamma spectrometric analysis and into the discussion of the spectrum adjustment procedure which combines experimental and theoretical results. Therefore, this representation deals not only with this special task but gives also a survey about the methodical approach and the state of art in Rossendorf for the general problem of determination of neutron fluences, because the developed methods are generally applicable and not limited to the special problem of neutron embrittlement. Different problems with respect of neutron fluences exist also in Germany.
The calculation of fluences is based on an accurate description of the history of the reactor for all irradiation periods, i.e. the time and space dependence of burnup, power and fisson sources. This information was given for a time and space grid of all fuel elements.
For the calculation of the fluences were not used time dependent fluxes, but at first integral sources of fission neutrons are calculated for different fissionable isotopes. Using these given integral source distributions the fluences were calculated and the results from the different fissionable source were composed. For the improvement of the comparison between experimental and theoretical results a special method was used calculating special integral sources for the given detector, because each detector according to its decay notes another integral source resp. flux distribution, which has to be theoretically corrected.
The basis of all transport calculations was the Monte Carlo method in a special problem adjusted kind. Special procedures were developed and successfully applicated for the reduction of statistical errors. Therefore, also for single specimens results with small statistical errors were obtained. It is remarkable that this accurate method which allows a realistic 3-dimensional description of the system reactor-surroundings could be applied with reasonable calculation times for the great number of needed calculations.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-87 Juni 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-355
Publ.-Id: 355


Recombination of nonequilibrium charge carriers in heavy ion tracks in silicon

Eremin, V.; Ilyashenko, I. N.; Strokan, N.; Schmidt, B.

  • Nuclear Instruments and Methods in Physics Research A 377 (1996) pp. 184-190
  • Poster
    Tagung: 7th European Symp. on Semiconductor Detectors, 7.-10. Mai 1995, Schloß Elmau

Permalink: https://www.hzdr.de/publications/Publ-354
Publ.-Id: 354


The application of high energy ion implantation for silicon radiation detectors

von Borany, J.; Schmidt, B.; Grötzschel, R.

  • Nuclear Instruments and Methods in Physics Research A 377 (1996) pp. 514-520
  • Lecture (Conference)
    oral presentation during, 7th European Symposium on Semiconductor Detectors, Schloß Elmau, 7.-10.5.1995

Permalink: https://www.hzdr.de/publications/Publ-353
Publ.-Id: 353


Aufbau eines behördlichen Fernüberwachungssystems zur betrieblichen Überwachung des KKW Saporoshje, Block 5, 1. Realisierungsstufe

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

The technical equipment required to improve the operational monitoring of the NPP Zaporozh'ye, Ukraine is represented. it includes two measuring lines for the upgrading of the operational measuring equipment and seven computer-engineering components for establishing an on-site NPP supervision and has been specified in accordance with NPP experts and specialists of the Ukrainian State Supervisory Authority. Furthermore, the results of practical tests are described to check the hard- and software suitability for the down loading of measuring data from an operational computer using an original SM-2M computer made in Russia and a simulator in the laboratory. To prove the exact function a special laboratory variant of the coupling receiver software was been developed. Conceptional proposals for the algorithmic realization of the on-site monitoring of the NPP Zaporozh'ye conclude this report.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-88 Mai 1995
    ISSN: 1436-3976

Permalink: https://www.hzdr.de/publications/Publ-350
Publ.-Id: 350


Vibration Experiments at a Coolant Loop of the Dukovany NPP

Altstadt, E.; Weiß, F.-P.; Weiß, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-86 April 1995
    ISSN: 1436-3976

Permalink: https://www.hzdr.de/publications/Publ-349
Publ.-Id: 349


Freimessung von Bauschutt - Low-Level-Messung alphastrahlender Nuklide

Hübener, S.; Nebelung, C.; Bernhard, G.

  • Lecture (Conference)
    Seminar des Instituts für Strahlenphysik der TU Dresden, 27.04.1995, Dresden
  • Other report
    Schlußbericht zum Fördervorhaben BMBF 02 S 7442 2, Berichtszeitraum: 1.3.92 - 31.5.1995

Permalink: https://www.hzdr.de/publications/Publ-348
Publ.-Id: 348


Specific binding of (3H)imipramine indicates the presence of a specific serotonin transport system on endothelial cells of porcine brain

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

  • Neuroscience Letters 194 (1995) 21-24

Permalink: https://www.hzdr.de/publications/Publ-347
Publ.-Id: 347


Point defect-based modeling of diffusion and electrical activation of ion implanted boron in crystalline silicon

Jäger, H.-U.

  • Contribution to proceedings
    Mat. Res. Soc. Symp., MRS Spring Meeting 1995, San Francisco
  • Journal of Applied Physics 78 (1), 1 July 1995, 176-186

Permalink: https://www.hzdr.de/publications/Publ-346
Publ.-Id: 346


Complete recrystallization of amorphous silicon carbide layers by ion beam irradiation

Heera, V.; Kögler, R.; Skorupa, W.; Stoemenos, J.

  • Applied Physics Letters 67 (1995) 14 pp. 1999-2001

Permalink: https://www.hzdr.de/publications/Publ-345
Publ.-Id: 345


Application of the Pulse-Shape Technique to Proton-Alpha Discrimination in Si-Detector Arrays

Pausch, G.; Moszynski, M.; Wolski, D.; Bohne, W.; Grawe, H.; Hilscher, D.; Schubart, R.; de Angelis, G.; de Poli, M.

  • Nuclear Instruments and Methods in Physics Research A 365 (1995) pp. 176-184
  • Open Access Logo Forschungszentrum Rossendorf; FZR-85 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-343
Publ.-Id: 343


Thermocapillary bubble migration at high Reynolds and Marangoni numbers under low gravity

Galindo, V.; Gerbeth, G.; Treuner, M.; Langbein, D.; Rath, H. J.

  • International Journal of Colloid and Interface Science, vol. 179, No. 1, pp. 114 - 127 (1996)

Permalink: https://www.hzdr.de/publications/Publ-342
Publ.-Id: 342


A Vibration Model for the Primary Circuit of VVER-440 type Reactors Based on Finite Elements

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

  • Lecture (Conference)
    Tagung: SMIRT 13, Structural Mechanics in Reactor Technology, Porto Alegre, Brasil, August 13 - 18, 1995, Vol. 2, pp. 323 - 328

Permalink: https://www.hzdr.de/publications/Publ-341
Publ.-Id: 341


Theoretical Vibration Model of VVER Reactors Considering Fluid-Structure-Interaction

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

A finite-element-model describing the mechanical vibrations of the whole VVER-440 primary circuit is being developed to support the early detection of mechanical component faults. A special fluid-structure-element was developed to consider the reaction forces of the fluid in the downcomer upon the moving core barrel and the rector pressure vessel. It was derived from an approximated analytical 2D-solution of the coupled system of 3D fluid equations and the structural equations of motions. By means of the vibration model all eigenfrequencies up to 30 Hz and the corresponding mode shapes were calculated. It is shown that the fluid-structure-interaction strongly influences those modes exhibiting a relative displacement between reactor pressure vessel and core barrel. Moreover, by means of the model the shift of eigenfrequencies due to the degradation or to the failure of internal clamping and spring elements was investigated. By comparing the frequency spectra of the normal and of the faulty structure, it could be shown that a recognition of such degradations and failures even inside the reactor pressure vessel is possible by pure excore vibration measurements.

  • Lecture (Conference)
    Tagung: SMORN VII, Avignon, France, 19 - 23 June 1995
  • Contribution to proceedings
    Tagung: SMORN VII, Avignon, France, 19 - 23 June 1995, Vol. 2, 9.7
  • Other report
    Forschungszentrum Rossendorf; März 1995, Preprint of SMORN VII

Permalink: https://www.hzdr.de/publications/Publ-340
Publ.-Id: 340


Acoustic Leak Monitoring with Neural Networks at Complicated Structures

Hessel, G.; Schmitt, W.; Weiß, F.-P.

  • Lecture (Conference)
    Tagung: SMORN VII, Avignon, France, 19 - 23 June, 1995, 4.11
  • Contribution to proceedings
    SMORN VII - A Symposium on Nuclear Reactor Surveillance and Diagnostics, OCDE/OECD Press, Paris, 1996, Vol. 1, pp. 359-366

Permalink: https://www.hzdr.de/publications/Publ-339
Publ.-Id: 339


Specification of a Technical System to improve the Operational Monitoring of the Zaporosh'ye NPP by the State Supervisory Authority of the Ukraine

Beyer, M.; Carl, H.; Langer, L.; Schumann, P.; Seidel, A.; Zschau, J.; Nowak, K.; Tolksdorf, P.

In order to improve the operational surveillance of a VVER-1000 unit of the Ukrainian nuclear power plant Zaporosh'ye a technical monitoring system has been specified. The system will enable the state regulatory and supervisory bodies to survey the unit operation independently of operators to assess its safety status, and to impose appropriate conditions. Due to its up-to-date configuration the system provides early indication of any operational incident and emission of radioactive materials connected. Based on the system an immediate warning in emergency 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.

  • Lecture (Conference)
    SMORN VII Conference, 7th Symposium on Nuclear Reaktor Surveillance and Diagnostics, Avignon, France, 19.-23. June 1995, Vol. 2, 14.3

Permalink: https://www.hzdr.de/publications/Publ-338
Publ.-Id: 338


Threshold phenomena in an open quantum mechanical system

Persson, E.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-83
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-337
Publ.-Id: 337


Weiterentwicklung und Verifikation eines dreidimensionalen Kernmodells für Reaktoren vom Typ WWER und seine Ankopplung an den Störfallcode ATHLET

Grundmann, U.; Lucas, D.; Mittag, S.; Rohde, U.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-84 März 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-336
Publ.-Id: 336


Zur Herausbildung verschiedener Zeitskalen beim Zerfall von Compoundkern-Resonanzen als Folge des Trapping-Effekts

Müller, M.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-79 (Dissertation)
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-335
Publ.-Id: 335


Zeitaufgelöste laserinduzierte Fluoreszenzspektroskopie an Huminsäuren und Untersuchung der Komplexbildung mit umweltrelevanten Schwermetallen

Brachmann, A.; Geipel, G.; Bernhard, G.; Pompe, S.; Bubner, M.; Nitsche, H.

  • Poster
    25. Hauptversammlung der GDCh vom 10.-13.9.1995 in Münster

Permalink: https://www.hzdr.de/publications/Publ-334
Publ.-Id: 334


Synthese und Charakterisierung von Uranylsilicat Dihydrat, (UO2)2SiO4 2H2O

Moll, H.; Matz, W.; Schuster, G.; Brendler, E.; Bernhard, G.; Nitsche, H.; Reich, T.

  • Poster
    25. Hauptversammlung der GDCh vom 10.-13.9.1995 in Münster, Themenbereich: Anorganische Chemie

Permalink: https://www.hzdr.de/publications/Publ-333
Publ.-Id: 333


First observation of inelastic X-ray scattering from condensed 4He using high energy resolution

Schell, N.; Simmons, R. O.; Burkel, E.

Recently, the suitability of inelastic X-ray scattering for the investigation of solid and fluid 4HE has been demonstraded. For the text experiments an energy resolution of the order of 10-15 meV was used at the backscattering spectrometer INELAX at the storage ring DORIS of DESY, Hamburg. Lattice excitations were observed for momentum transfers along the c axis of h.c.p. helium crystals which were grown in situ at pressures of 54-63 Mpa and at temperatures of 4.2-6.4 K. At 10 k abowve the melting point, engery-loss signals could also be detected from the liquid helium at equivalent momentum transfers.

  • Journal of Synchrotron Radiation (1996). 3, 316-317

Permalink: https://www.hzdr.de/publications/Publ-332
Publ.-Id: 332


Investigation of microbial degradation of PCB congeners using isotopically modified tracers

Bubner, M.; Heise, K.-H.; Nitsche, H.; Matucha, M.; Sasek, V.; Veleminsky, J.; Spizek, J.

  • Lecture (Conference)
    7th Intern. Conf. Bioindicators (Abstr.)
  • Ecological Chem. St. Petersburg, Russia 1997, 6(3): 204-211

Permalink: https://www.hzdr.de/publications/Publ-331
Publ.-Id: 331


Synthesis of uniformly 13C and 14C-Labelled PCB-Congeners

Bubner, M.; Meyer, M.; Fuksova, K.; Matucha, M.; Heise, K.-H.; Nitsche, H.

  • Poster
    7th Intern. Conf. Bioindicators
  • Ecological Chem. St. Petersburg, Russia, 1998, 7(1):65-68

Permalink: https://www.hzdr.de/publications/Publ-330
Publ.-Id: 330


Bestimmung der Speziation des Uraniums mittels Zeitaufgelöster Laserinduzierter Fluoreszenzspektroskopie

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

  • Lecture (Conference)
    Anakon '95

Permalink: https://www.hzdr.de/publications/Publ-329
Publ.-Id: 329


Comparision of CoSi2 Interconnection Lines on Crystalline and Noncrystalline Silicon Fabricated by Writing Focused Ion Beam Implantation

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

A focused beam of Co+ ions has been used to produce CoSi2 interconnects by means of ion beam synthesis. Investigations have been performed using polysilicon, amorphous and crystalline silicon substrates. The influence of implantation dose and annealing temperature on the resistivity has been studied. For room temperature implantation and annealing 600°C for 1h, a resistivity of about 60µ(*cm has been obtained independent of the subtrate type. The CoSi2 layers have been found to be stable up to 700°C. CoSi2 interconnects have been fabricated on the slope walls of 200µm deep anisotropically etched grooves using a dynamic focus control of the focused ion beam.

  • Applied Surface Science 91 (1995) pp. 44-49
  • Lecture (Conference)
    MAM '95

Permalink: https://www.hzdr.de/publications/Publ-326
Publ.-Id: 326


MHD Turbulence: Use of gas bubbles as local tracers in Liquid Metal MHD Flows

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

  • Open Access Logo Forschungszentrum Rossendorf; FZR-80
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-325
Publ.-Id: 325


Gaschromatographie mit W-Isotopen in ...

Vahle, A.; Hübener, S.; Böttger, H.; u. a.

  • Lecture (Conference)
    3. Workshop "Chemie der schwersten Elemente", 15.-17.3.1995 in Mainz

Permalink: https://www.hzdr.de/publications/Publ-324
Publ.-Id: 324


Isotherme on-line Hochtemperatur-Gaschromatographie der Elemente der 6. Gruppe in feuchtem Sauerstoff - Testexperimente mit OLGA II

Hübener, S.

  • Lecture (Conference)
    3. Workshop "Chemie der schwersten Elemente", 15.-17.3.1995 in Mainz

Permalink: https://www.hzdr.de/publications/Publ-323
Publ.-Id: 323


Ein Hybrid-Modell zur Untersuchung von Stößen schwerer Ionen bei mittleren Energien

Heide, B.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-108 (Dissertation)
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-322
Publ.-Id: 322


Evaporation Rates for Liquid Clusters

Frauendorf, S.

  • Zeitschrift für Physik D 35 (1995) pp. 191
  • Open Access Logo Forschungszentrum Rossendorf; FZR-82 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-321
Publ.-Id: 321


Institute of Ion Beam Physics and Materials Research; Annual Report 1994

Möller, W.; Wieser, E.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-77
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-320
Publ.-Id: 320


Level repulsion in the complex plane

Müller, M.; Dittes, F.-M.; Iskra, W.; Rotter, I.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-70 Preprint
    ISSN: 1436-3976
  • Physical Review E 52 (1995) pp. 5961

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Permalink: https://www.hzdr.de/publications/Publ-319
Publ.-Id: 319


1% Cold leg break experiment on PMK-2 Test results and computer code analysis

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

In the framework of the computer code assessment programme for the VVER-440 type Paks Nuclear Power Plant a 1% cold leg break experiment has been conducted on the PMK-2 integral type test facility. It was followed by calculations using RELAP 5Mod3.1 and ATHLET in order to assess code capabilities. This experiment was started from the nominal operational parameters and it was considered that only the high pressure injection system (HPIS) is available and there is no injection from the safety injection tanks (SIT). This experiment was the repetition of the test measured in 1990 with improved data aquisition system. The first part of this report includes a short description of the facility, the measurement description, the test results including the local void measurement and a short interpretation of the main phenomena. In the second part of the report the analysis performed by the RELAP 5Mod3.1 and ATHLET Mod1.1 Cycle A codes are given.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-76 March 1995
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-318
Publ.-Id: 318


Institute of Nuclear and Hadron Physics; Annual Report 1994

Prade, H.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-78
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-317
Publ.-Id: 317


Ag+ sensitive membran in sub-µm thickness prepared by ion implantation

Möller, D.; Pham, T.; Hüller, J.; Albrecht, J.

AG2S embedded into a 100 nm thin film of SiO2 was fabricated synthetically from ist constituents by ion implantation. The ion sensing characteristics of such film material for Ag+ were shown to be analogous to conventional bulk materials, giving sensitivities <=59 mV per concentration decade.

  • Analytica Chimica Acta (short communication), 306 (1995) 1-4

Permalink: https://www.hzdr.de/publications/Publ-316
Publ.-Id: 316


Possible Impacts of Phosphate Influx on the Uranium Speciation and Migration in Seepage Waters

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

  • Poster
    "International Conference and Workshop Uranium-Mining and Hydrogeology"
  • Contribution to proceedings
    Intern. Conf. Workshop "Uranium Mining and Hydrogeology", 01.10.1995, Freiberg, Germany, Köln: Sven v. Loga, 61

Permalink: https://www.hzdr.de/publications/Publ-315
Publ.-Id: 315


Das Quark-Gluon-Plasma mit thermischen Partonenmassen und Konsequenzen des Modells für die thermische Dileptonenemission

Peshier, A.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-75
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-314
Publ.-Id: 314


Proceedings of the FOBOS workshop '94

Wagner, W.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-65
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-313
Publ.-Id: 313


Institute of Bioinorganic and Radiopharmaceutical Chemistry; Annual Report 1994

Johannsen, B.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-73
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-312
Publ.-Id: 312


Leckdetektion an komplizierten dreidimensionalen Topologien

Hessel, G.; Schmitt, W.; Weiß, F.-P.

The well-known methods of the acoustic leak localization using the attenuation differences or propagation time differences (e.g. cross correlation analysis) are restricted to the linear geometry of pipe lines. At complicated three-dimensional topologies they fail because there are several modes of the structure-borne sound that have different propagation velocities and because numerous connecting branches generate multiple sound reflexion. Therefore, a new method for detecting and localizing the leaks at complicated geometrical structures was developed and experimentally proved at an original facility. This approach is based on the detection of the leak induced airborne sound or structure-borne sound as well as on the application of pattern recognition procedures. The efficiency both of Fuzzy Logic and neural networks for the acoustic leak localization could be experimentally proved. Though the method has been prototypically developed for Russian pressurized water reactors of VVER-440 type, it can also be used by the self-learning capability of the classifiers at other pressurized facilities.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-67 Januar 1995
    ISSN: 1436-3976
  • Other report
    Abschlußbericht des SMWK-Forschungsvorhabens, FKZ 7541.83 - FZR/2 (1995), S. 1-15

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Permalink: https://www.hzdr.de/publications/Publ-311
Publ.-Id: 311


Institute of Safety Research; Annual Report 1993

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

The report gives an overview on the scientific work of the Institute of Safety Research in 1993.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-68 Juni 1994
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-310
Publ.-Id: 310


Speziation des Uraniums in Haldensickerwässern des Uranerzbergbaus

Geipel, G.; Bernhard, G.; Nitsche, H.

  • Lecture (Conference)
    Kolloq., Okt., Freiberg

Permalink: https://www.hzdr.de/publications/Publ-309
Publ.-Id: 309


Laboratory Simulation for the Sorption of U, Th and Pb on Rock Materials from Uranium Mining

Thieme, M.; Geipel, G.; Bernhard, G.; Nitsche, H.

  • Lecture (Conference)
    "MIGRATION 95", Saint-Malo, 10.-15. Sept. 1995
  • Lecture (Conference)
    Int. Conf. and Workshop "Uranium Mining and Hydrogeology", Freiberg, 4.-6. Oct. 1995

Permalink: https://www.hzdr.de/publications/Publ-308
Publ.-Id: 308


Hadron Production in Proton-Proton Interactions at Medium Energies

Müller, H.

Hadron production in proton-proton interactions is described in the framework of a collision model, which aims at describing simultaneously all reaction channels in a wide energy region. An empirical matrix element based on the present knowledge of the partonic structure of hadrons is combined with the concept of intermediate subsystems and the calculation of modified statistical weights of the various final states. It is demonstrated that the energy dependence of total cross sections between threshold and about 50 GeV incident energy can be satisfactorily reproduced. This is the basis for concidering theoretical and experimental problems of K-, η and η´ production in more detail.

  • Zeitschrift für Physik A 353 (1995) pp. 103

Permalink: https://www.hzdr.de/publications/Publ-307
Publ.-Id: 307


Angular distribution and energy spread of a lithium liquid metal ion source

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

For a lithium liquid metal ion source (LMIS) an especially high angular intensity and a low energy broadening is expected because of the low mass of lithium. For a Li LMIS the axial angular intensity and the FWHM of the energy distributation have been measured. The results have been compared with the theoretial predictions and with experimental results for gallium, the metal most widly used in LMIS. A correlation between angular intensity and the energy broadening is found. The Li LMIS has a high angular intensity, especially at low currents, compared to the Ga LMIS. With increasing emission current the rise of the angular intensity as well as the ernergy broadening is smaller than than for the gallium source.

  • Journal of Physics D: Appl. Phys. 28 (1995) pp. 1707-09

Permalink: https://www.hzdr.de/publications/Publ-306
Publ.-Id: 306


Gasgehaltsprofile in einer Blasenströmung bei erzwungener Konvektion

Prasser, H.-M.; Ringel, V.

Es ist bekannt, daß die Magnus-Kraft in einer aufwärtsgerichteten Zweiphasenströmung bei erzwungener Flüssigkeitsströmung aufgrund des Geschwindigkeitsprofils der Flüssigkeit in Richtung der Kanalwand wirkt. In einem senkrechten Rohr müßten demnach Gasgehaltsprofile zu beobachten sein, die in der Nähe der Rohrwand ihr Maximum aufweisen. In der Realität sind solche Profile nur bei sehr kleinen Gasvolumenstromdichten existent. Meist liegen Profile vor, die ein Maximum des Gasanteils im Zentrum der Rohrleitung aufweisen. Es wird vermutet, daß in diesem Fall die Turbulenz den Einfluß der Magnus-Kraft überwiegt und für die Herausbildung des Maximums im Zentrum verantwortlich ist. Zur genaueren Untersuchung des Übergangs zwischen den beiden Strömungsformen wurden Messungen der radialen Verteilung des volumetrischen Gasanteils an einer drucklosen, mit Luft-Wasser-Gemisch betriebenen Testschleife durchgeführt. Die Anlage verfügt über einen senkrechten Testkanal (NW 50). Zur Messung des Gasgehaltes dienten nadelförmige Leitfähigkeitssonden. Insgesamt wurden 8 Sonden über den Radius des Rohrs verteilt und deren Signale synchron aufgezeichnet. Die Lufteinspeisung erfolgte gleichmäßig über dem Querschnitt der Rohrleitung. Die maximalen Volumenstromdichte des Wassers betrug 2.8 m/s, der eingeperlte Gasstrom wurde von 0 bis ca. 0.4 m/s variiert. Durch eine Einlauflänge von 40 Rohrdurchmessern traten am Sondenkamm trotz der gleichmäßigen Einperlung ausgeprägte Gasgehaltsprofile auf. Dabei wurden für entsprechend kleine Luftdurchsätze Verteilungen erhalten, die ein stark ausgeprägtes Maximum am Rand der Rohrleitung aufweisen. Bei Vergrößerung des Luftstromes findet in einem bestimmten Durchsatzbereich ein kontinuierlicher Rückgang des Randmaximums statt. Gleichzeitig tritt das für die turbulente Verteilung typische Maximum im Zentrum auf und es stellt sich ein parabelförmiges Profil ein. Z.B. für eine Volumenstromdichte des Wassers von 0.7 m/s findet dieser Übergang bei einer Volumenstromdichte von ca. 0.2 m/s statt. Der Bereich der stabilen, durch die Magnus-Kraft gesteuerten Gasgehaltsverteilung wurde aufgezeichnet. Der Übergang zur parabelförmigen Verteilung des Gasgehalts verschiebt sich bei wachsender Wassergeschwindigkeit hin zu höheren Werten des Luftvolumenstroms.

  • Lecture (Conference)
    Sitzung des GVC-Fachausschusses "Mehrphasenströmung", 16./17.2.1995, Magdeburg

Permalink: https://www.hzdr.de/publications/Publ-305
Publ.-Id: 305


Use of a rotating magnatic field in vertical Bridgeman crystal growth - magnet design and model experiments

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

  • Lecture (Conference)
    11th International Conference on Crystal Growth, Den Haag, Niederlande, June 1995

Permalink: https://www.hzdr.de/publications/Publ-304
Publ.-Id: 304


Generation Properties of a Laboratory MHD Dynamo Model

Gailitis, A.; Gerbeth, G.

  • Lecture (Conference)
    MAHID 95 - Konferenz, Riga, August 1995

Permalink: https://www.hzdr.de/publications/Publ-303
Publ.-Id: 303


Heat transfer experiments in a turbulent sodium MHD channel flow

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

  • Lecture (Conference)
    MAHID 95 - Konferenz, August 1995, Riga

Permalink: https://www.hzdr.de/publications/Publ-302
Publ.-Id: 302


Oblique hydrothermal wave instability of thermocapillary driven convection in a coplanar magnetic field

Priede, J.; Thess, A.; Gerbeth, G.

  • Lecture (Conference)
    9th European Symposium "Gravity Dependet Phenomena", Berlin, May 1995 und MAHID 95 - Konferenz, Riga, August 1995

Permalink: https://www.hzdr.de/publications/Publ-301
Publ.-Id: 301


Thermocapillary Bubble and Drop Migration in a Drop Tower Experiment

Treuner, M.; Langbein, D.; Galindo, V.; Gerbeth, G.

  • Lecture (Conference)
    9th European Aymposium "Gravity Dependent Phenomena", Berlin, May 1995

Permalink: https://www.hzdr.de/publications/Publ-300
Publ.-Id: 300


Collective Effects and Multifragmentation in Heavy Ion Collisions at Intermediate Energies within a Hybrid Model

Heide, B.; Barz, H.-W.

  • Nuclear Physics A 588 (1995) pp. 918
  • Open Access Logo Forschungszentrum Rossendorf; FZR-71 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-299
Publ.-Id: 299


Parton kinetics for strangeness and charm production

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

  • Contribution to proceedings
    Am. Inst. of Physics, Conference Proceedings 340, "Strangeness in Hadronic Matter", Tucson 1995, (Ed.) J. Rafelski, p. 355
  • Open Access Logo Forschungszentrum Rossendorf; FZR-72 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-296
Publ.-Id: 296


ELBE ein supraleitender 250 MeV Elektronenbeschleuniger für das FZR

Prade, H.; Dönau, F.

interne Projektstudie

  • Open Access Logo Forschungszentrum Rossendorf; FZR-74
    ISSN: 1436-3976

Permalink: https://www.hzdr.de/publications/Publ-295
Publ.-Id: 295


Triaxial shapes of sodium clusters

Reimann, S. M.; Brack, M.; Frauendorf, S.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-69
    ISSN: 1436-3976
  • Zeitschrift für Physik D 34 (1995) pp. 125

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Permalink: https://www.hzdr.de/publications/Publ-294
Publ.-Id: 294


Solution of AER Benchmark Problem on Control Rod Worth of Paks VVER-440 by the Code DYN3D

Mittag, S.

This paper presents a solution of the AER benchmark problem specified for the 7th cycle of the Paks-2 VVER-440 reactor. The problem concerns control rod worth for both the beginning and the end of burnup cycle states. The burnup distribution of cycle 7 was calculated starting from the burnup values of the third cycle. The calculations were carried out by using the burnup option of the DNYN3D code and a MAGRU group data library. The results are compared with calculations published by other authors on AER meetings. Furthermore the influence on reactivity of some control rod properties typical for VVER-440 was studied.

  • Lecture (Conference)
    4th AER Symposium in Sozopol, Bulgaria, Oct. 1994
  • Contribution to proceedings
    Proc. 4th AER Symposium, Sozopol, Bulgaria, October 10 - 13, 1994, pp. 443 - 461

Permalink: https://www.hzdr.de/publications/Publ-292
Publ.-Id: 292


Results of Second Kinetic AER-Benchmark

Grundmann, U.

Mathematical benchmark are widely used and accepted means of verifying the reliability of numerical simulations. The present benchmark is aimed at assessing the discrepancies between three-dimensional core models used for transient calculations in VVER-reactor cores.
The second AER benchmark problem was defined at the 3nd AER Symposium in Pieštany (1993). The problem and the complete set of input data for a control rod ejection accident in a VVER-440 was described. An asymmetric control rod with a worth approximately 2 ßeff was ejected at hot zero power (HZP). The Doppler effect being the main feedback effect for this type of transients is the only feedback taken into account by an adiabatic model of fuel temperature. Therefore it was possible to calculate this type of transient with codes which do not contain a complete thermo-hydraulic model.
Results of the four codes BIPR-8 (RRI Moskau), DYN3D/M2 (RCR Rossendorf), HEXTRAN (VVT Espoo) and KOKO3D (KFKI-AERI Budapest) were obtained and analyzed by comparisons. The agreement of the results is quite satisfactory, however there exist some discrepancies.

  • Contribution to proceedings
    und Vortrag, 4th AER Symposium, Sozopol, Bulgaria, October 10 - 13, 1994, pp. 397 - 415

Permalink: https://www.hzdr.de/publications/Publ-291
Publ.-Id: 291


Solaranlage Waldblickschule Freital - Solare Warmwasserbereitung und Fernwärmeeinspeisung

Brünig, D.; Rindelhardt, U.

Das Pilotprojekt Freital zur Einspeisung von Solarwärme in ein Fernwärmenetz wird vorgestellt und diskutiert. An sonnenscheinreichen Tagen wird die Rücklauftemperatur des Fernwärmenetzes von 58 °C auf 75°C erhöht. Der Kollektorkreiswirkungsgrad liegt an solchen Tagen bei Werten von über 40 %.

  • Lecture (Conference)
    Tagung "Energie und Umwelt '95" am 22./23.3.1995 in Freiberg, Tagungsband S. 95
  • Contribution to proceedings
    Tagung "Energie und Umwelt '95" am 22./23.3.1995 in Freiberg, Tagungsband S. 95

Permalink: https://www.hzdr.de/publications/Publ-290
Publ.-Id: 290


Ein neues PV-Kennlinien-Meßgerät

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

Ein Gerät zur Messung der Kennlinien von Photovoltaik-Generatoren wurde entwickelt. Es handelt sich ein transportables, PC-gesteuertes Gerät zur Messung von Generatoren im Leistungsbereich zwischen 1 und 5 kWp. Als leistungsmodulierbares Bauelement wird erstmalig ein MOS-Transistor genutzt. Erste Meßergebnisse werden vorgestellt.

  • Poster
    10. Symposium Photovoltaische Solarenergie, 15.-17.03.1995, Staffelstein, Tagungsband S. 461
  • Contribution to proceedings
    10. Symposium Photovoltaische Solarenergie, 15.-17.03.1995, Staffelstein, Tagungsband S. 461

Permalink: https://www.hzdr.de/publications/Publ-288
Publ.-Id: 288


Ion Beam Induced Epitaxial Crystallization of SiC: Fluence - and Temperature Dependence

Kögler, R.; Heera, V.; Skorupa, W.; Voelskow, M.

  • Ion Beam Modification of Materials, 1996 Elsevier Science B. V. p. 912
  • Poster
    IBMM '95

Permalink: https://www.hzdr.de/publications/Publ-287
Publ.-Id: 287


Ion Beam Induced Interfacial Amorphization of Silicon below Room Temperature

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

  • Poster
    IBMM '95

Permalink: https://www.hzdr.de/publications/Publ-286
Publ.-Id: 286


CoSi2 microstructures by means of a high current focused ion beam

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

The Rossendorf focused ion beam IMSA-100 was contructed and used for writing implantation of cobalt to form CoSi2-submicron strutures on silicon by ion beam synthesis. Two types of cobalt containing liquid alloy ion source were developed with Co-Nd and Co-Ge alloys. The fabrication of CoSi2 structures by stoichiometric implantation of Co+ (E = 30-35 keV, Iion = 1.3 nA) and Co2+ ions (E = 60 keV, Iion = 0.6 nA) at doses between 0.3 and 5x1017 cm-2 and a subsequent two step annealing (600°C, 60 min; 1000°C, 30 min in N2) is demonstrated. The dose dependence as well as the influence of the substrate temperature between room temperature and 400°C during ion implantation on the ion beam synthesis process were studied. The quality of the silicide submicron structures was investigated by scanning electron microscopy, energy dispersive x-ray analysis, and electrical measurments. While the room temperature implantation and subsequent annealing generate an inhomogeneous CoSi2 film, 400°C substrate heating during implantation leads to a countinuous film with a resistivity below 20µ( cm, comparable with broad beam implantation.

  • Journal of Vacuum Science and Technology Part B 12 (1994) 6 pp. 3523-3527
  • Lecture (Conference)
    IBMM '95 Canberra

Permalink: https://www.hzdr.de/publications/Publ-284
Publ.-Id: 284


Betriebserfahrungen mit großen solarthermischen Anlagen in Sachsen

Brünig, D.; Rindelhardt, U.; Dittmann, A.; Doltze, T.; Gassel, A.

Die zwei größten solarthermischen Anlagen Sachsens werden im Anlagenaufbau und hinsichtlich der bisher vorliegenden Betriebserfahrungen vorgestellt und verglichen. Dies ist zum einen eine Anlage in Freital mit 90 m² Absorberfläche zur Warmwassererzeugung und Fernwärmeeinspeisung. Zum zweiten handelt es sich um sieben Anlagen mit je 100 m² Absorberfläche zur Warmwasserbereitung in Wohnblöcken in Oederan. Beide Anlagen arbeiten störungsfrei. Die geplanten solaren Erträge konnten in der ersten Betriebsperiode nicht erreicht werden. In der Freitaler Anlage lag die Rücklauftemperatur des Fernwärmenetzes etwa 20 K über der Auslegungstemperatur, was zu schlechten Kollektorwirkungsgraden führte. In Oederan betrug der Warmwasserbedarf nur ca. 60 % des Auslegungswertes mit dem gleichen negativen energetischen Effekt.

  • Lecture (Conference)
    Tagungsserie Klimagipfel der Fördergesellschaft Erneuerbare Energien Berlin/Brandenburg e.V., Wildau, 20.01.1995

Permalink: https://www.hzdr.de/publications/Publ-283
Publ.-Id: 283


Neutral Oxorhenium(V) Complexes with Tridentate Dithiolates and Monodentate Alkane- or Arene-thiolate Coligands

Spies, H.; Fietz, T.; Pietzsch, H.-J.; Johannsen, B.; Leibnitz, P.; Reck, G.; Scheller, D.; Klostermann, K.

  • Journal of the Chemical Society Dalton Transactions (1995) 13 pp. 2277-2280

Permalink: https://www.hzdr.de/publications/Publ-282
Publ.-Id: 282


Break-up of the N=50 core in 3989Y50

Reif, J.; Winter, G.; Schwengner, R.; Prade, H.; Käubler, L.

The semi-magic nucleus 3989Y50 has been
studied in the framework of the spherical shell model. Relative to a hypothetical
66Ni core the expanded configuration space (0f5/2,
1p3/2, 1p1/2, 0g9/2) and (1p1/2,
0g9/2, 1d5/2, 0g7/2) for protons and neutrons,
respectively, has bveen considered. The results, both for the excitation
energies and electromagnetic transition probabilities, suggest for the
positive-parity states above 4.5 MeV with 17/2 <= I <=23/2 significant
admixtures of the neutron [(0g9/2)-1(1d5/2)]
excitation coupled to the odd proton occupying the 0g9/2 orbital.
The calculations predict that the experimentally observed states above
7.2 MeV with 23/2 <= I <=31/2 are generated by the additional excitation
of one proton to the 0g9/2 orbital resulting in a parity alteration.
The strength of the electric dipole transitions connecting the levels of
the two proposed high-spin structures might be explained by small contributions
of the neutron 0h11/2 excitation to the involved wave functions.

  • Nuclear Physics A 587 (1995) pp. 449

Permalink: https://www.hzdr.de/publications/Publ-280
Publ.-Id: 280


Ion Beam synthesis by tungsten-Implantation into 6H-SiC

Weishart, H.; Steffen, H. J.; Skorupa, W.; Schöneich, J.; Matz, W.

  • Poster
    MRS 1994 Fall Meeting, 28.11-2.12.1994, Boston, Symposium A, Mat. Res. Soc. Symp. Proc. 354 (1995) 177
  • Contribution to proceedings
    MRS 1994 Fall Meeting, 28.11-2.12.1994, Boston, Symposium A, Beam-Solid Interactions for Materials Synthesis and Characterization 354(1995) 177-182

Permalink: https://www.hzdr.de/publications/Publ-279
Publ.-Id: 279


Multifragmentation study on 30 A MeV 32S + 58Ni

Siwek, A.; Budzanowski, A.; Kantor, W.; Sourell, A.; Fuchs, H.; Homeyer, H.; Röschert, G.; Schwarz, C.; Terlau, W.; Tutay, A.; Pausch, G.

  • Zeitschrift für Physik A 350 (1995) 4 pp. 327-341

Permalink: https://www.hzdr.de/publications/Publ-278
Publ.-Id: 278


Hot leg break tests at the ISB-VVER integral test facility

Gashenko, V. A.; Proshutinsky, A. P.; Prasser, H.-M.; Zippe, W.

Existing thermal hydraulic best-estimate codes have to undergo a procedure of extended verification in respect to the special qualities of VVERs. Concerning then VVER-1000 the Russian test facility ISB-VVER only is available, which is located in Elekrtogorsk near Moscow. It was put into operation in October 1992 and was used as the source of experimental data for the first Russian Standard Problem, a 2.4 % small break KOCA test. The present paper deals with a series of tests dedicated ro an 11 % break at the upper plenum of the reactor vessel. ISB-VVER is a two-loop model of the VVER-1000. The elevations are kept 1:1, while the volume and power scales are 1:3000. The four loops of the original plant are modelled as one single loop with one and a triple loop with three parallel steam generators. During the experiments needle shaped conductivity probes of the Recearch Center Rossendorf were applied for void measurements. The tests have shown that in case of a leak in the upper plenum, the cooling capability of the high-pressure injection system strongly depends on the location of the injection. The most favourable condictions for the core cooling are achieved by the injection in both the cold and the hot leg simultaneousely. In this case, an 11 % break in the upper plenum can be safely ruled over without fuel rod overheating by operating the HPIS only. In some cases, oscillations of void fractions and water levels were found.

  • Lecture (Conference)
    Jahrestagung Kerntechnik '95, Nürnberg, 16.-18.5.1995
  • Contribution to proceedings
    Proc. Jahrestagung Kerntechnik , Nürnberg, 16. - 18. Mai 1995, p. 123

Permalink: https://www.hzdr.de/publications/Publ-277
Publ.-Id: 277


Solare Trinkwarmwasserbereitung und Einspeisung in ein Fernwärmenetz - Demonstrationsanlage Waldblickschule Freital

Brünig, D.; Rindelhardt, U.

Im Beitrag werden erste Ergebnisse der Messungen (Zeitraum Juli-Dezember 1994) an der Solaranlage vorgestellt. Kollektorkreis, Pufferspeicherladekreis, Brauchwasserladekreis und Fernwärmeeinspeisung werden im Einzelnen analysiert. Die Betriebsergebnisse bestätigen die Auslegung, aufgrund erhöhter Rücklauftemperaturen des Fernwärmenetzes liegen die energetischen Ergebnisse der Solaranlage unter den projektierten Werten.

  • Lecture (Conference)
    Terrarec '95, Kongreß West-Ost-Transfer Umwelt Leipzig, 1. - 3.3. 1995, Tagungsband Energie S. 156
  • Contribution to proceedings
    Terrarec '95, Kongreß West-Ost-Transfer Umwelt Leipzig, 1. - 3.3. 1995, Tagungsband Energie S. 156

Permalink: https://www.hzdr.de/publications/Publ-276
Publ.-Id: 276


The Tensor Analyzing Power T20 in Deuteron Break-up Reactions within the Bethe-Salpeter Formalism

Kaptari, L. P.; Umnikov, A. Y.; Kämpfer, B.; Khanna, F. C.

The tenser analyzing power T-20 and the polarization transfer kappa in the deuteron break-up reaction Dp --> pX are calculated within a relativistic approach based on the Bethe-Salpeter equation with a realistic meson-exchange potential. Our results on T-20, kappa and the cross section are compared with experimental data and non-relativistic calculations and with the outcome of a relativization procedure of the deuteron wave function.

  • Physics Letters B 351 (1995) pp. 400
  • Open Access Logo Forschungszentrum Rossendorf; FZR-64 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-275
Publ.-Id: 275


X-ray absorption studies of uranium sorption on mineral substrates

Reich, T.; Hudson, E. A.; Terminello, L. J.; Viani, B. E.; Bucher, J. J.; Shuh, D. K.; Edelstein, N. M.

  • Contribution to external collection
    Materials Research Society, Herbsttreffen '94 in Boston

Permalink: https://www.hzdr.de/publications/Publ-274
Publ.-Id: 274


Neutral roh-meson properties in an isospin-asymmetric pion medium

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

  • Physics of atomic nuclei 59 (1996) 694
  • Open Access Logo Forschungszentrum Rossendorf; FZR-66 Preprint
    ISSN: 1436-3976
  • Jadernaja fizika 59 (1996) 4 pp. 727-734

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Permalink: https://www.hzdr.de/publications/Publ-273
Publ.-Id: 273


Arbeitstreffen: Kern- und Teilchenphysik, 4.-7. Oktober 1994, Pirna, Band I-IV

Möller, K.; Naumann, L.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-63
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-272
Publ.-Id: 272


Bericht der Herbsttagung der Studiengruppe Elektronische Instrumentierung vom 26. bis 28. September 1994 in Marburg

Gabriel, F.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-62
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-271
Publ.-Id: 271


Small cold leg break experiment on PMK-2

Ézsöl, G.; Guba, A.; Prasser, H.-M.; Schäfer, F.

In the framework of the computer code assessment programme for the VVER-440 type Paks Nuclear Power Plant a 1% cold leg break experiment has been executed on the PMK-2 integral type test facility. For the test it was considered that only high pressure injection system (HPIS) is available and there is no injection from the safety injection tanks (SIT). The experiment was the repetition of the test measured in 1990, with improved data aquisition system. In the report the results of the experiment were discussed and a description of the phenomena was given.

  • Lecture (Conference)
    Jahrestagung Kerntechnik 1995
  • Contribution to proceedings
    Jahrestagung Kerntechnik, Nürnberg, 16. -18. Mai 1995, p. 119

Permalink: https://www.hzdr.de/publications/Publ-270
Publ.-Id: 270


Direktmessung von Actiniden in Beton durch Alpha-Spektrometrie von Dünnschichtmeßpräparaten

Nebelung, C.; Hübener, S.; Bernhard, G.; Nitsche, H.

  • Lecture (Conference)
    IV. Stillegungskolloquium Hannover 8.-10.11.1995 in Bad Dürkheim
  • Contribution to external collection
    IV. Stillegungskolloquium Hannover und 3. Statusbericht Stillegung und Rückbau kerntechn. Anlagen, "Technik und Umwelt", FZ Karlsruhe, pp. 417-424

Permalink: https://www.hzdr.de/publications/Publ-268
Publ.-Id: 268


Nachweis von Bestrahlungsdefekten in WWER-RDB-Stählen durch Kleinwinkelstreuexperimente

Böhmert, J.

  • Lecture (Conference)
    Jahrestagung Kerntechnik 1995
  • Contribution to proceedings
    Proc. Jahrestagung Kerntechnik '95, Nürnberg, Mai 1995, S. 379 - 381

Permalink: https://www.hzdr.de/publications/Publ-267
Publ.-Id: 267


A Note on Thermocapillary Instability in the Presence of a Magnetic Field

Thess, A.; Nitschke, K.

We formulate the asymptotic theory of thermocapillary instability in a planar fluid layer heated from below in the presence of a strong magnetic field corresponding to high Hartmann number. Explicit asymptotic expressions are derived for the velocity perturbation, temperature perturbation and electric current density. Their spatial structure is characterized in terms of Hartmann boundary layers - a concept which permits a physical understanding of more complicated situations involving surface deformation, buoyancy and thermoelectric effects. The physical nature of large scale instabilities in the case of a deformable surface is clarified.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-61
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-264
Publ.-Id: 264


Tilted Cranking

Frauendorf, S.; Meng, J.; Reif, J.

  • Contribution to external collection
    Int. Sym. on Phys. with large gamma-ray arrays, Berkeley 1994
  • Open Access Logo Forschungszentrum Rossendorf; FZR-59 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-262
Publ.-Id: 262


Three Contributions to the Seventh International Symposium on Small Particles and Inorganic Clusters

Frauendorf, S.; Reimann, S. M.; Pashkevich, V. V.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-58 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-261
Publ.-Id: 261


Resonance phenomena at high level density

Sobeslavsky, E.; Dittes, F.-M.; Rotter, I.

  • Journal of Physics A 28 (1995) pp. 2963
  • Open Access Logo Forschungszentrum Rossendorf; FZR-60 Preprint
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-260
Publ.-Id: 260


Schaffung eines Internationalen Zentrums für Information und Frühwarnung bei nuklearen Ereignissen in mittel- und osteuropäischen Kernkraftwerken

Carl, H.; Schumann, P.; Zschau, J.

Im Rahmen eines vom Sächsischen Staatsministeriums für Wissenschaft und Kunst geförderten Vorhabens wurden 1994 die Untersuchungen zu den Aufgaben, zu den zu erwartenden Kosten und zu den Realisierungschancen für ein internationales Zentrum für Information und Frühwarnung bei nuklearen Ereignissen in mittel- und osteuropäischen Kernkraftwerken planmäßig fortgesetzt und das laufende Projekt mit dem Abschlußbericht zum 31.12.1994 abgeschlossen.
Für die anstehenden Aufgaben, nämlich Abschätzung der Emissionen, Prognose der Radioaktivitätsausbreitung, Verfolgung der Lageentwicklung und Mitwirkung bei der Vorbereitung von Notfallschutzmaßnahmen sind im wesentlichen radiologische Meßwerte über die freigesetzten radioaktiven Stoffe und meteorologischen Kennwerte zur Beschreibung der Ausbreitungsbedingungen an das Zentrum zu übertragen. Betriebliche Informationen über den Anlagenzustand sind nur im Sinne von Hintergrundinformationen erforderlich, wozu 8 bis 10 ausgewählte sicherheitsrelevante Betriebsparameter ausreichend sind.

Obwohl der Sinn eines solchen Vorhabens außer Frage steht, sind die Realisierungschancen ohne eine umfassende Förderung durch die EG und andere internationale Organisationen - World Association of Nuclear Operators WANO, International Atomic Energy Agency IAEA - gering.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-57
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-259
Publ.-Id: 259


Bestimmung von Actiniden in Bauschutt, Determination of actinides in concrete

Nebelung, C.; Hübener, S.; Bernhard, G.

  • Poster
    27. Jahrestagung Entsorgung, 25.-29.9.1995 Wolfenbüttel
  • Reihe: Fortschritte im Strahlenschutz; Entsorg. Band II; 27. Jahrestagung Wolfenbüttel, Fachverb. f. Strahlenschutz e. V., FS-95-77-1, ISSN 1013-4506

Permalink: https://www.hzdr.de/publications/Publ-256
Publ.-Id: 256


Aktuelle Ergebnisse der Untersuchungen zum Mechanismus der Neutronen Versprödung in Reaktordruckbehälterstahl

Große, M.; Böhmert, J.; Brauer, G.

Bestrahlungsinduzierte Ausscheidungen gelten als die strukturelle Ursache der Neutronenversprödung von Reaktordruckbehälterstahl (RDB-Stahl). Am Beispiel des WWER-440 RDB-Stahls 15Cr2MFA wird die Korrelation zwischen dem Volumenanteil an bestrahlungsinduzierten Ausscheidungen und der Erhöhung der Sprödbruchübergangstemperatur diskutiert. Es wird eine bimodale Abhängigkeit dieser beiden Größen gefunden. Ursache des bimodalen Verhaltens sind möglicherweise unterschiedliche Arten von bestrahlungsinduzierten Ausscheidungen, die vom Gehalt an Verunreinigungselementen bestimmt sind.
Erste resonante Röntgenkleinwinkelstreuexperimente an Material mit niedrigem Cu-Gehalt zeigen, daß Vanadium ein wesentlicher Bestandteil der bestrahlungsinduzierten Ausscheidungen ist. Die Ergebnisse von Neutronenkleinwinkelstreuung und Positronenannihilationsspektroskopie unterstützen die Hypothese, daß es sich bei den Ausscheidungen im RDB-Stahl 15Cr2MFA um Vanadiumkarbide handelt.

  • Lecture (Conference)
    Seminar GKSS Geesthacht Abt. WN, 1994

Permalink: https://www.hzdr.de/publications/Publ-254
Publ.-Id: 254


The New Rossendorf Nuclear Microprobe

Herrmann, F.; Grambole, D.


The New Rossendorf Nuclear Microprobe1)
F. Herrmann and D. Grambole

Recently a 3 MV tandetron accelerator was put into operation at the Research Center Rossendorf. At this accelerator we have installed a new nuclear microprobe. The object forming aperture can be changed continuously from 0 to 150 µm and in each direction independently. The magnetic quadrupole triplet delivered by Danfysik has an energy mass product of 45 MeV.amu. Magnetic coils placed behind it scan the beam over an area up to 1 x 1 mm². A manipulator with X-Y-Z-translation, 360° rotation, and tilt enables us together with the adequate detectors to apply ERDA, PIXE, RBS, and NRA. A PC based CAMAC system acquires data from four ADCs. Up to four elemental maps with up to 128 x 128 pixels can be displayed on-line. All events are stored together with their coordinates in list mode for further analysis.
A general problem for a quantitative analysis is the accuracy of charge measurement. Using the whole target chamber as a Faraday cup which would be the best method is impossible in our installation. A negatively biased electrode in front of the target for suppressing the secondary electrons cannot be used either. Therefore a precise current integrator was developed which can operate with a positive offset voltage of several hundred volts at the input. The principle of this integrator will be described as well as first experiences and comparisons to other charge measuring methods. Furthermore, a beam monitoring system based on this integrator was set up for an easy control of the beam.

1) The project was supported by Bundesminister für Forschung und Technologie under contract 03-GR3ROS

  • Nuclear Instruments and Methods in Physics Research B 104 (1995) 26-30
  • Lecture (Conference)
    Fourth International Conference on Nuclear Microprobe Technology and Applications Shanghai, China, October 10-14, 1994

Permalink: https://www.hzdr.de/publications/Publ-252
Publ.-Id: 252


Interplay of Collective Flow Phenomena and Velocity Correlations of Intermediate - Mass Fragments in Collisions of Au+Au at E=100-400 A MeV

Kotte, R.; Kämpfer, B.; Mösner, J.; Neubert, W.; Wohlfarth, D.; u. a.

  • Physical Review C 51 (1995) 2686
  • Open Access Logo Forschungszentrum Rossendorf; FZR-56 Preprint
    ISSN: 1436-3976

Downloads:

Permalink: https://www.hzdr.de/publications/Publ-251
Publ.-Id: 251


Analysis of transients for NPP with VVER-440 using the code SiTAP

Kalinenko, V.

The report contains results of the analysis of the transients "Loop connection" and "SG tube rupture" for NPP with VVER-440 type reactors. To obtain detailled informations about NPP's dynamic characteristics, various variants of initial and boundary conditions are considered.
Calculation of these transients was performed with use of the code SiTAP developed at the Nuclear Safety Institute of Russian Research Centre "Kurchatov Institute". SiTAP is a multi-functional computer tool for fast analysis of transient and accidental processes of VVER type reactors for engineers working in the field of NPP dynamics.
SiTAP can be used for comparative analysis of several variants of accident scenarios to find out the conditions leading to the most severe consequences from safety point of view. For this cases, additional analyses using best-estimate codes should be carried out.
The results from SiTAP for faulty loop connection leading to a boron dilution accident are intended to be used as boundary conditions for a more detailled analysis by the help of the three-dimensional reactor core model DYN3D, developed in the Research Centre Rossendorf for the simulation of reactivity initiated accidents.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-54
    ISSN: 1436-3976

Downloads:

Permalink: https://www.hzdr.de/publications/Publ-250
Publ.-Id: 250


A Note on Bénard Marangoni Instability in the Presence of a Magnetic Field

Thess, A.; Nitschke, K.

Explicit asymptotic expressions are derived for the first unstable mode of surface tension driven instability in an electrically conducting fluid subjected to a strong magnetic field. The spatial structure of the velocity, temperature, and electric current density is characterized in terms of Hartmann boundary layers - a concept that permits a physical explanation of the role of the magnetic field and an understanding of scaling laws derived in previous work.

  • Physics of Fluids 7 (1995) 1176-1178

Permalink: https://www.hzdr.de/publications/Publ-249
Publ.-Id: 249


Pushing and Cranking Corrections to the Meson Fields of the Bosonized Nambu & Jona-Lasinio Model

Schleif, M.; Wünsch, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-55 Preprint
    ISSN: 1436-3976

Downloads:

Permalink: https://www.hzdr.de/publications/Publ-248
Publ.-Id: 248


Wind Energy Ressources in Saxony: An Experimental Approach

Daniels, W.; Kuntzsch, J.; Rindelhardt, U.

In 1991 a special programme was initiated by the Saxonian Environmental Ministry to estimate the wind energy potential in Saxony and to identify sites for economic operation of wind energy converters.
In the frame of the programme 16 wind measuring stations were erected, more concentrated in orographically complicated regions. The wind speed was measured at two heights between 10 m and 36 m a. g. l. Ten-minutes-averaging-values of wind velocity and direction were registrated over a time of minimally one year.
The danish Wind-Atlas Program WASP was applied to calculate wind atlas librariers from the measured wind datas. The atlas library represents the regional wind climate of the measuring station. Because WASP was developed mainly for coast and lowland regions far from mountains, special efforts were necessary to estimate the region of representance in Saxony. It could be shown, that in lowland regions the area of representance regions in some cases was comparable with WASP results from coast regions. Especially in the mountain region of the "Erzgebirge" the representance regions was found to be very small. By means of atlas libraries the wind power density in the northern part of Saxony was calculated.

On the basis of these investigations the wind energy potential of Saxony could be estimated. Totally 500 usable sites were identified with an average number of 5 500-kW-wind turbines at each site. Using these capacity a yearly energy production of 2200 GWh seems to be possible.

  • Lecture (Conference)
    Proceedings of the European Wind Energy Association Conference EWEC'94, 10.-14. Oktober 1994, Thessaloniki, Greece, Volume I, p. 238 - 243
  • Contribution to proceedings
    Proceedings of the European Wind Energy Association Conference EWEC'94, 10.-14. Oktober 1994, Thessaloniki, Greece, Volume I, p. 238 - 243

Permalink: https://www.hzdr.de/publications/Publ-247
Publ.-Id: 247


Amorphization and Recrystallization of 6H-SiC by Ion Beam Irradiation

Heera, V.; Kögler, R.; Skorupa, W.; Stoemenos, J.

  • Journal of Applied Physics 77 (1995) 2999
  • Poster
    Poster und Proceedings bei MRS Spring Meeting 1994, San Francisco, Mat. Res. Soc. Symp. Proc. 339 (1994) 197

Permalink: https://www.hzdr.de/publications/Publ-246
Publ.-Id: 246


Thermocapillary Bubble Migration at Higher Marangoni numbers - Theory and Experiment

Gerbeth, G.; Galindo, V.; Treuner, M.; Langbein, D.

Single bubble motion driven purely by thermocapillarity (i.e. a linear temperature gradient in the surrounding liquid) is analyzed theoretically with the following steps: A full numerical simulation up to Re of several hundreds depending on the Prandtl-number of the liquid, and a simple analytical treatment describing the asymptotic migration at high Re. Results of short-term microgravity experiments performed at drop Tower Bremen will be reported for 20 < Re < 160. The theoretical migration velocities are slightly higher than the experimental values which might be due to the short-time nature of the experiments. An unsteady theoretical analysis will be given explaining, at least in part, the remaining discrep-ancy between theory and experiment.

  • Lecture (Conference)
    1994 Meeting APS/DFD, Atlanta, 20-22 November
  • Bulltin of the American Physical Society, Series II, 39 (1994), 9, p. 1841

Permalink: https://www.hzdr.de/publications/Publ-245
Publ.-Id: 245


Control of the Cylinder Wake Instabilities by an External Magnetic Field

Mutschke, G.; Gerbeth, G.

The standard cylinder wake is considered for the magnetohydrodynamic (MHD) case: The fluid is electrically conducting and exposed to an external uniform magnetic field of different directions. In general, the magnetic field stabilizes the flow, the vortex street can be suppressed for each Re. A numerical simulation of the time-dependent flow as well as a simple analytical stability analysis will be presented and compared with available and own experiments. The experimentally found tendency of an increasing level of low-frequency perturbations for an increasing magnetic field will be discussed and compared with the analytical stability analysis. Typical features of the MHD case will be presented: Drag increase, up- and downstream wakes, surface pressure redistribution, recirculation bubbles at high Re, etc.

  • Lecture (Conference)
    and Proceedings: 1994 Meetingof the Division of Fluid Dynamics (APS/DFD), Atlanta, 20-22 November 1994, Bulletin of the American Physical Society, Series II, 39 (1994) 9, p. 1979

Permalink: https://www.hzdr.de/publications/Publ-244
Publ.-Id: 244


Photovoltaik in den neuen Bundesländern: Ergebnisse des 1000-Dächer-Programms in Sachsen

Rindelhardt, U.

Die Nutzung der Photovoltaik in den neuen Bundesländern wird am Beispiel Sachsens dargestellt. Der größte Impuls kam vom Bund-Länder-1000-Dächer-Photovoltaik-Programm, das die Installation von kleinen netzgekoppelten PV-Anlagen förderte. Weitere Anwendungen betreffen Nischenmärkte wie z.B. Parkscheinautomaten.

  • Lecture (Conference)
    Deutsch-Russische Konferenz "Erneuerbare Energiequellen in Rußland und Deutschland", Freiburg, 24.-26.10.1994, Tagungsband S. 44
  • Contribution to proceedings
    Deutsch-Russische Konferenz "Erneuerbare Energiequellen in Rußland und Deutschland", Freiburg, 24.-26.10.94, Tagungsband S. 44

Permalink: https://www.hzdr.de/publications/Publ-243
Publ.-Id: 243


"De re metallica" (G. Agricola) - IBA on air

Neelmeijer, C.; Wagner, W.; Schramm, H.-P.; Thiel, U.

On the occasion of Georgius Agricola's 500th birthday in 1994 attention has been focused on the paint material found in an exemplar of his famous scientific book “De re metallica”. The very thin color coatings on the highly sensitive paper substrate represent a challenge to the power and the guaranteed non-destructiveness of IBA. The combined implementation of PIXE and RBS on the external proton beam set-up allows one to determine the chemical elements of the pigments used and to identify the presence of organic layers. Results from selected colors are given to emphasize the complementary character of on-air PIXE-RBS analysis.

Keywords: ion beam analysis; non-destructive analysis; external proton beam; PIXE; RBS; book painting; thin layers

  • Nuclear Instruments and Methods in Physics Research B 99 (1995) 390
  • Lecture (Conference)
    Denton-Conf. 1994

Permalink: https://www.hzdr.de/publications/Publ-242
Publ.-Id: 242


Slow, highly charged ions from a 7.25 GHz ECR ion source

Henke, D.; Tyrroff, H.; Grötzschel, R.; Wirth, H.

  • Contribution to external collection
    Beitrag zur HCI 1994

Permalink: https://www.hzdr.de/publications/Publ-241
Publ.-Id: 241


Interconnection lines following the surface topography fabricated by writing focused ion beam implantation

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

The Rossendorf Focused Ion Beam IMSA-100 was used for writing Co-implantation over a topographical structure surface with a prtly controlled focus. After a subsequent annealing the resulting CoSi2 interconnection lines were analysed by SEM and electrical measurements. Also the influence of the depth of focus on the height of the surface contours as well as the resulting radial beam profiles were investigated.

  • Microelectronic Engineering 27 (1995) pp. 351-354

Permalink: https://www.hzdr.de/publications/Publ-240
Publ.-Id: 240


Einbindung ins Fernnetz wird in Sachsen erprobt

Brünig, D.; Rindelhardt, U.

Solarwärme - Einbindung ins Fernwärmenetz wird in Sachsen erprobt
Die im Juni 1994 in Betrieb genommene solarthermische Anlage mit 100 m2 Kollektorfläche ist ein sächsisches Modellvorhaben. Neben der üblichen solaren Trinkwarmwasserbereitung - hier für die Schule - steht die Einspeisung von Solarwärme in ein neugeschaffenes gasbeheiztes Fernwärmenetz im Mittelpunkt eines Langzeitmeß- und analyseprogramms des Forschungszentrums Rossendorf. Die Solaranlage arbeitet nach dem Low-Flow-Prinzip der Kollektordurchströmung in Verbindung mit einer selbstregelnden Speicherschichtbeladung. Regelung und Meßdatenerfassung werden durch eine DDC-Anlage realisiert.

  • Sonnenenergie & Wärmetechnik 5/1994, S.21

Permalink: https://www.hzdr.de/publications/Publ-239
Publ.-Id: 239


Shell-model States and Collectivity in83Br48 and 85Rb48

Schwengner, R.; Winter, G.; Reif, J.; Prade, H.; Käubler, L.; Wirowski, R.; Nicolay, N.; Albers, S.; Esser, S.; von Brentano, P.; Andrejtscheff, W.

Excited states of the nuclei 83Br and 85Rb were populated
in the reaction 82Se(7Li,alpha2n) and 82Se(7Li,4n),
respectively, using the 7Li beams of the FN tandem accelerator
in Cologne (E=32 MeV) and of the 120 cm cyclotron in Rossendorf (E=35 MeV).Gamma-gamma-particle
coincidences were measured with six Ge and fourteen Si detectors installed
at the detector array Cologne OSIRIS CUBE. This technique enabled a reaction
channel selection. Multipole orders of the gamma-rays were derived from
directional correlations of coincident gamma-rays and from angular distributions.
Mean lifetimes were deduced for seven levels in 83Br and two
levels in 85Rb using the Doppler-shift-attenuation method. The
level scheme of 83Br has been extended up to (21+/2)
and 15-/2 states. In 85Rb a level sequence built
on the ground state has been established up to 15(-)/2 and a
new cascade of fast M1 transitions starting with a 17(-)/2 state
at 3198.2 keV has been found. Furthermore, several medium-spin states have
been newly introduced. The level sequences inboth nuclei have been interpreted
in terms of the shell model. The calculations performed in the model space
pi(0g9/2, 1p1/2, 1p3/2, 0f5/2)
v(0g9/2, 1p1/2) reproduce single-particle characteristics
as well as collective properties of the level sequences.

  • Physica Scripta T56 (1995) pp. 126

Permalink: https://www.hzdr.de/publications/Publ-238
Publ.-Id: 238


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