Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

"Online First" included
Without submitted and only approved publications
Only approved publications

31835 Publications
A neural network approach for acoustic leak monitoring in the VVER440 pressure vessel head
Hessel, G.; Schmitt, W.; van der Vorst, K.; Weiß, F.-P.;
A neural network approach has been developed for localizing leakages and estimating the leak rate in the VVER-440 pressure vessel head. Results are presented from experiments with simulated leaks. Three-layer perceptron networks were found to be best suited for leak localization and for the estimation of leak rates. However, the estimation of leak rates required an additional neural network because a different normalization procedure was necessary for extracting features from RMS values of the acoustic emission sensors. Perceptron networks with continuously valued outputs corresponding to the coordinates of the leak positions were useful for indentifying even leak positions which had not been offered during training.
Keywords: Leak; monitoring; neural networks; pressurized water reactors; VVER reactors
  • Progress in Nuclear Energy, Vol. 34, No. 3, pp. 173 - 183, 1999

Publ.-Id: 2534 - Permalink


Interaction of high-energy ion beams with silicon: buried layers, gettering and defect engineering
Yankov, R. A.;
  • Lecture (others)
    VARIAN Company, Gloucester, MA, USA, Dec. 4, 1997

Publ.-Id: 2533 - Permalink


Proximity gettering of transition-metal impurities in separation-by-implanted-oxygen (SIMOX) structures using buried carbon- and helium-implanted layers
Yankov, R. A.;
  • Lecture (others)
    Naval Res. Lab, Electronics Division, Washington D.C., USA, Nov. 26, 1997

Publ.-Id: 2532 - Permalink


Effekte bei der Implantationsdotierung von Bor und Aluminium in 6H-SiC
Wirth, H.;
  • Lecture (others)
    Daimler-Benz-AG, FZ Frankfurt/M., Oct. 29, 1997

Publ.-Id: 2531 - Permalink


Verfahren zur Minimierung des Einflusses von Resonanzfluktuationen auf das Meßsignal bei Ultraschall-Durchschallungsuntersuchungen
Prasser, H.-M.; Hensel, F.; Schütz, P.;
Das Patent beschreibt ein Verfahren zur Minimierung des Einflusses von Resonanzfluktuationen des Meßmediums bei Ultraschall-Durchschallungsuntersuchungen an in Rohrleitungen geführten Zwei- und Mehrphasenströmungen durch eine schnelle Variation der Arbeitsfrequenz des Senders der Meßeinrichtung.
Keywords: ultrasonic transmission measurement, wobbling, Wobbeln, Ultraschall-Transmissionsmessung
  • Patent
    DE 4333645 A1
  • Patent
    EP 0721572 B1

Downloads:

Publ.-Id: 2530 - Permalink


Using ANSYS/FLOTRAN® and CFX-4® for the solution of a mixed convection flow benchmark
Krepper, E.; Willschütz, H.-G.; Altstadt, E.; Weiß, F.-P.;
For the design, optimisation and safety analysis of nuclear plants, the use of 1D system codes is state of the art. However, for the modelling of passive equipment the range of validity of the 1D-codes is exceeded, because in these structures 3D-flow phenomena are often dominating. The fast progress of the computer technique and of Computational-Fluid-Dynamics (CFD-) codes gives the opportunity, to apply CFD-codes to the assessment of the efficiency of those components. Most of these codes are based either on the finite-volume or the finite-element method.
Integrated simulation of thermo-hydraulic phenomena and the resulting thermo-mechanical loadings for the surrounding structures (e. g. the reactor pressure vessel) can be achieved using a finite-element-code like ANSYS/Multiphysics®. The finite volume code CFX® has been proven to be an appropriate tool for modelling of 3D single phase fluid phenomena.
The governing mechanism in passive components for decay heat removal is natural convection and heat transfer with internal heating. To assess the capability of both codes describing a mixed convection flow, post test calculations of an IAHR (International Association for Hydraulic Research) benchmark exercise were performed (Kamide et. al, 1991). The working fluid was water in the temperature range of 15 to 50°C at atmospheric pressures.
This paper presents a discussion of the problems and capabilities of each code to calculate complex flow regimes and temperature fields.
Keywords: buoyancy driven fluid flow, CFD post-test analysis, ANSYS/FLOTRAN, CFX-4, heat transfer, natural convection
  • Lecture (Conference)
    17. CAD-FEM Users´ Meeting, 6.-8. Oktober 1999, Sonthofen, Germany, Proceedings Paper No. I 2.4
  • Contribution to proceedings
    17. CAD-FEM Users´ Meeting, 6.-8. Oktober 1999, Sonthofen, Germany, Proceedings Paper No. I 2.4

Publ.-Id: 2529 - Permalink


Subthreshold Production of Kaons and Antikaons in Nucleus-Nucleus Collisions at Equivalent Beam Energies
Barth, R.; Senger, P.; Ahner, W.; Beckerle, P.; Bormann, C.; Brill, D.; Cieslak, M.; Debowski, M.; Grosse, E.; Koczon, P.; Kohlmeyer, B.; Miskowiec, D.; Müntz, C.; Oeschler, H.; Pühlhofer, F.; Schwab, E.; Schicker, R.; Shin, Y.; Speer, J.; Ströbele, H.; Sturm, C.; Völkel, K.; Wagner, A.; Walus, W.;
  • Physical Review Letters, Volume 78, Number 21, 26 May 1997, 4007-4010

Publ.-Id: 2528 - Permalink


Enhanced Out-of-Plane Emission of K+ Mesons Observed in Au + Au Collisions at 1 A GeV
Shin, Y.; Ahner, W.; Barth, R.; Beckerle, P.; Brill, D.; Cieslak, M.; Debowski, M.; Grosse, E.; Koczon, P.; Kohlmeyer, B.; Mang, M.; Miskowiec, D.; Müntz, C.; Oeschler, H.; Pühlhofer, F.; Schwab, E.; Schicker, R.; Senger, P.; Speer, J.; Ströbele, H.; Sturm, C.; Völkel, K.; Wagner, A.; Walus, W.;
  • Physical Review Letters, Volume 81, Number 8, 24 August 1998, 1576-1579

Publ.-Id: 2527 - Permalink


Ionenimplantation in 6H-SiC; Elektrische Untersuchungen und Sublimation
Wirth, H.;
  • Lecture (others)
    Daimler-Benz-AG, FZ Frankfurt/M., Jan. 8, 1997

Publ.-Id: 2526 - Permalink


Bestimmung von Ni-Tiefenprofilen in Al und Aufklärung der Phasenbildung bei Ionenimplantation in Al
Wieser, E.;
  • Lecture (others)
    Seminar des Sonderforschungsbereiches "Strukturbildung und Eigenschaften in Grenzschichten", Dresden, Nov. 20, 1997

Publ.-Id: 2525 - Permalink


Flüssigmetall-Ionenquellen und ihre Anwendung in Ionenfeinstrahlanlagen
Teichert, J.;
  • Lecture (Conference)
    Univ. Magdeburg, Inst. f. experimentelle Physik, Nov. 27, 1997

Publ.-Id: 2524 - Permalink


Monte-Carlo and rate-equation simulations describing the evolution of nanoclusters in high-dose ion implantation
Strobel, M.;
  • Lecture (others)
    Solid State Division, Oak Ridge National Laboratory, Oak Ridge, USA, Oct. 23, 1997

Publ.-Id: 2523 - Permalink


Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies
Laue, F.; Sturm, C.; Böttcher, I.; Debowski, M.; Förster, A.; Grosse, E.; Koczon, P.; Kohlmeyer, B.; Mang, M.; Naumann, L.; Oeschler, H.; Pühlhofer, F.; Schwab, E.; Senger, P.; Shin, Y.; Speer, J.; Ströbele, H.; Surowka, G.; Uhlig, F.; Wagner, A.; Walus, W.;
  • Physical Review Letters Volume 82, Number 8, 22 February 1999, 1640-1643

Publ.-Id: 2522 - Permalink


High energy implantation into silicon: Gettering and Defect Engineering
Skorupa, W.;
  • Lecture (others)
    Bell Labs, Lucent Technologies, Murray Hill, NJ, USA, Dec. 8, 1997

Publ.-Id: 2521 - Permalink


Ion beam processing of Semiconductors: Research activities at the Forschungszentrum Rossendorf
Skorupa, W.;
  • Lecture (others)
    VARIAN Company, Gloucester, MA, USA, Dec. 4, 1997

Publ.-Id: 2520 - Permalink


Blaue Lumineszenz hoher Intensität aus implantierten SiO2-Schichten: Nanocluster oder ....?
Skorupa, W.;
  • Lecture (others)
    Innovationskolleg "Methoden und Materialsysteme für den Nanometerbereich", Institut für Physik, TU Chemnitz, Oct. 24, 1997

Publ.-Id: 2519 - Permalink


Strong blue photo-and electroluminescence from ion beam synthesized Ge-rich SiO2-layers
Skorupa, W.;
  • Lecture (others)
    Dept. de Fisica Aplicada i Electronica, Univ.Barcelona, Spain, Nov. 11, 1997
  • Lecture (others)
    Naval Res. Lab, Electronics Division, Washington, D.C., USA, Nov. 26, 1997

Publ.-Id: 2518 - Permalink


Defectengineering and gettering by high energy implantation into Silicon
Skorupa, W.;
  • Lecture (others)
    Center for Analysis of Substances, Moscow, Russia, May 26, 1997

Publ.-Id: 2517 - Permalink


Hochenergieimplantation in Silicium: Defekt-Engineering und Gettern
Skorupa, W.;
  • Lecture (others)
    Institut für Physik, FSU Jena, May 16, 1997

Publ.-Id: 2516 - Permalink


Ionenstrahlmodifizierung von Halbleitermaterialien: Forschungsaktivitäten am Institut für Ionenstrahlphysik und Materialforschung
Skorupa, W.;
  • Lecture (others)
    Vortrag zur Evaluierung durch den Wissenschaftlichen Beirat des FZR, Rossendorf, Apr. 29, 1997
  • Lecture (others)
    Treffen der Dresdener Forschungsinstitute mit der Sächsischen Industrie, Dresden, June 27, 1997

Publ.-Id: 2515 - Permalink


Verschleißschutz von Alumnium- und Magnesiumlegierungen durch Ionenimplantation
Richter, E.; Chudoba, T.; Wieser, E.;
  • Lecture (others)
    Innovative Verfahren der Oberflächenvergütung von Leichtmetallen, Essen, June 5, 1997

Publ.-Id: 2514 - Permalink


Strong blue and violet light emission from silicon- and germanium-implanted silicon dioxide
Rebohle, L.;
  • Lecture (others)
    Bell Labs, Lucent Technologies, Murray Hill, NJ, USA, Dec. 8, 1997

Publ.-Id: 2513 - Permalink


Erzeugung blauer Lumineszenz-Zentren in SiO2 durch Ionenstrahlsynthese
Rebohle, L.;
  • Lecture (others)
    Vortrag zur Evaluierung durch den Wissenschaftlichen Beirat des FZR, Rossendorf, Apr. 4, 1997

Publ.-Id: 2512 - Permalink


Theoretische Beschreibung von Implantationsprozessen: Grundlagen, Methoden, Anwendungen
Posselt, M.;
  • Lecture (Conference)
    Sommerschule "Nukleare Sonden und Ionen", Bad Blankenburg, Germany, Sept. 1-5, 1997

Publ.-Id: 2511 - Permalink


Recent positron annihilation studies of the CuMn-system
Nicht, E.-M.;
  • Lecture (others)
    Lehrstuhl für Tieftemperaturphysik, Univ. Prag, Oct. 30, 1997

Publ.-Id: 2509 - Permalink


Ionenstrahlen in Forschung und Technik
Möller, W.;
  • Lecture (others)
    Physikalisches Kolloquium des Inst. für Physikalische Hochtechnologie, Jena, June 4, 1997

Publ.-Id: 2508 - Permalink


Ion beam analysis in Europe and Germany
Möller, W.;
  • Lecture (others)
    Univ. of Surrey, Dept. Electrica Engineering, Guildford, U.K., Feb. 4, 1997

Publ.-Id: 2507 - Permalink


Das Rossendorfer Strahlrohr ROBL an der ESRF
Matz, W.;
  • Lecture (others)
    Zentrumsseminar FZR, Dec. 4, 1997

Publ.-Id: 2506 - Permalink


Synchrotronstrahlung: Eigenschaften, Quellen, Anwendungen
Matz, W.;
  • Lecture (others)
    Zentrumsseminar FZR, Nov. 20, 1997

Publ.-Id: 2505 - Permalink


Der Materialforschungsmeßplatz der Rossendorfer Beamline an der Europäischen Synchrotronstrahlungs-quelle in Grenoble
Matz, W.;
  • Lecture (others)
    TU Dresden, Institut für Kristallographie und Festkörperphysik, Nov. 11, 1997

Publ.-Id: 2504 - Permalink


Experimente der Materialforschung an ROBL
Matz, W.; Prokert, F.; Eichhorn, F.; Schell, N.; Betzl, M.;
  • Lecture (others)
    Nutzertreffen ROBL, FZR, Rossendorf, June 19, 1997

Publ.-Id: 2503 - Permalink


ROBL: Strahlrohr und Experimentierausrüstung
Matz, W.;
  • Lecture (others)
    Nutzertreffen ROBL, FZR, Rossendorf, June 19, 1997

Publ.-Id: 2502 - Permalink


Basics and applications of plasma immersion ion implantation
Mändl, S.;
  • Lecture (others)
    University of Augsburg, Nov. 20, 1997

Publ.-Id: 2501 - Permalink


Plasma immersion ion implantation
Mändl, S.;
  • Lecture (others)
    City University of Hongkong, Oct. 13, 1997

Publ.-Id: 2500 - Permalink


Defective zones in Si detected by means of metal gettering
Kögler, R.;
  • Lecture (others)
    Univ. Barcelona, Dept. Fisica Aplicada i Electronica, Barcelona, Spain, Nov. 10, 1997

Publ.-Id: 2499 - Permalink


Detektion von Defektzonen in ionenimplantiertem Si
Kögler, R.;
  • Lecture (others)
    MLU Halle-Wittenberg, FB Physik, Halle (Saale), Apr. 10, 1997

Publ.-Id: 2498 - Permalink


Theoretische Grundlagen der Ionenstrahlsynthese: Computersimulationen auf atomarer Ebene
Heinig, K.-H.;
  • Lecture (others)
    Seminar an der TU Chemnitz, Chemnitz, Germany, May 13, 1997

Publ.-Id: 2497 - Permalink


Theoretische Grundlagen der Ionenstrahlsynthese: Beschreibungen basierend auf Ratengleichungen
Heinig, K.-H.;
  • Lecture (others)
    Seminar an der TU Chemnitz, Chemnitz, Germany, May 6, 1997

Publ.-Id: 2496 - Permalink


Grundlagen der Synthese von Nanoclustern und dünnen Schichten mit Ionenstrahlen
Heinig, K.-H.;
  • Lecture (others)
    Seminar am ISI des Forschungszentrum Jülich, Jülich, Germany, February 27, 1997

Publ.-Id: 2495 - Permalink


Implantations- und Ausheileffekte in SiC
Heera, V.;
  • Lecture (others)
    Institutsseminar FWI-FZR, Rossendorf, June 5, 1997

Publ.-Id: 2494 - Permalink


Verschleißfester Edelstahl – ein Erfolg der Ionenstrahltechnik
Günzel, R.; Richter, E.;
  • Lecture (others)
    Workshop "Werkstoffe innovativ", Hannovermesse 1997

Publ.-Id: 2493 - Permalink


Plasma source ion implantation in the Forschungszentrum Rossendorf: state of the art and recent developments
Günzel, R.;
  • Lecture (others)
    IPR, Ghandinagar, March 18, 1997

Publ.-Id: 2492 - Permalink


Recent developments of in situ ion beam analysis at Rossendorf
Grötzschel, R.;
  • Lecture (others)
    Faure, South Africa, Nov. 19, 1997

Publ.-Id: 2491 - Permalink


Grundlagen der Ionenstrahlanalytik
Grötzschel, R.;
  • Lecture (others)
    TU Chemnitz, Graduiertenkolleg, Jan./Feb., 1997

Publ.-Id: 2490 - Permalink


Möglichkeiten der Oberflächenanalytik mit Ionenstrahlverfahren im Forschungszentrum Rossendorf
Grambole, D.;
  • Lecture (others)
    TU Dresden, Inst. f. Werkstoffwissenschaften, Aug. 13, 1997

Publ.-Id: 2489 - Permalink


Ellipsometry as a diagnostic tool for thin film processing
Fukarek, W.;
  • Lecture (others)
    Institute of Polymer Physics, Charles University Prague, Nov. 27, 1997

Publ.-Id: 2488 - Permalink


The Rossendorf electrostatic accelerator
Friedrich, M.;
  • Lecture (others)
    SINR Shanghai, Dept. of Physics, P. R. China, April 17, 1997

Publ.-Id: 2487 - Permalink


Progress in the study of vacancy-type defects in ion implanted SiC by slow positron implantation spectroscopies
Brauer, G.;
  • Lecture (others)
    Univ. of East Anglia (School of Physics), Norwich, Nov. 7, 1997

Publ.-Id: 2486 - Permalink


Positron studies of defects in ion-implanted and annealed SiC
Brauer, G.;
  • Lecture (others)
    Lawrence Livermore National Lab, Physics and Space Technology, Livermore, USA, May 22, 1997

Publ.-Id: 2485 - Permalink


Ionenstrahlsynthese von Nanoclustern für elektrooptische Anwendungen
von Borany, J.;
  • Lecture (others)
    1. Materialwissenschaftliche Tagung der WGL, Berlin, Oct. 14, 1997

Publ.-Id: 2484 - Permalink


Ionenstrahlphysik und Technik im Forschungszentrum Rossendorf
von Borany, J.;
  • Lecture (others)
    FernUniversität Hagen, FB Elektrotechnik, Jan. 31, 1997

Publ.-Id: 2483 - Permalink


Zusammenarbeit mit industriellen Einrichtungen (Industriekooperation)
von Borany, J.;
  • Lecture (others)
    Vortrag zur Evaluierung durch den Wissenschaftlichen Beirat des FZR, Rossendorf, Apr. 29, 1997

Publ.-Id: 2482 - Permalink


Neutronenstreuung am RFR
Betzl, M.;
  • Lecture (others)
    Vortrag auf Kolloquium des VKTA - 40 Jahre Rossendorfer Forschungsreaktor RFR, Rossendorf, Dec. 16, 1997

Publ.-Id: 2481 - Permalink


Impurity gettering effects in separation-by-implanted-oxygen (SIMOX) structures - what getters what, where and how
Yankov, R. A.; Kaschny, J. R.; Fichtner, P. L. F.; Mücklich, A.; Kreißig, U.; Skorupa, W.;
  • Lecture (Conference)
    10th Biennial Conf. on Insulating Films on Semiconductors, Stenungsund, Sweden, June 11 - 14, 1997

Publ.-Id: 2480 - Permalink


Ionenimplantation aus Vakuumbogenplasmen
Witke, W.; Siemroth, P.; Brückner, J.; Brutscher, J.; Richter, E.;
  • Lecture (Conference)
    8. Bundesdeutsche Fachtagung Plasmatechnologie, Dresden, Sept. 14 - 17, 1997

Publ.-Id: 2479 - Permalink


Kristallgitter-Einbau implantierter Ionen in 6H-SiC
Wirth, H.; Voelskow, M.; Panknin, D.; Skorupa, W.;
  • Lecture (Conference)
    DPG-Frühjahrstagung, Münster, March 17 - 21, 1997

Publ.-Id: 2478 - Permalink


Investigation of ion-implantation induced damage in 6H-SiC by RBS/C and Positron Annihilation Spectroscopy
Wirth, H.; Anwand, W.; Brauer, G.; Voelskow, M.; Panknin, D.; Skorupa, W.; Coleman, P. G.;
  • Lecture (Conference)
    Int. Conf. on Silicon Carbide, III-Nitrides and Related Materials, Stockholm, Sweden, Aug. 31 - Sept. 5, 1997

Publ.-Id: 2477 - Permalink


Synchrotron X-ray studies of AlGaAs/GaAs epitaxial layers implanted with Se ions
Wieteska, K.; Wierzchowski, W.; Turos, A.; Grötzschel, R.;
  • Lecture (Conference)
    4th Symp. on Synchrotron Radiation, Krakow, PL, 1997

Publ.-Id: 2476 - Permalink


Teilchenbeschleuniger - Grundlagen
Guratzsch, H.;
Ausgehend von der Wirkung elektischer und magnetischer Felder auf elektrisch geladene Teilchen, wie Elektronen und Ionen, wird die Funktion der Teilchenbeschleuniger erläutert. Auf die Analogie zwischen Lichtoptik und Elektronen- bzw. Ionenoptik wird bei der Betrachtung der Strahlführung hingewiesen. Wichtig für das Funktionieren eines Beschleunigers ist die korrekte Berücksichtigung der kinematischen Beziehungen zwischen Energie, Masse und Geschwindigkeit. Mit Hilfe von schematischen Darstellungen werden verschiedene Beschleunigertypen vorgestellt. Die Emission von Synchrotronstrahlung begrenzt bei Elektronen-Kreisbeschleunigern die praktisch erreichbare Energie. Der LEP-Ring im CERN erreicht mit 27 km Umfang eine Energie von 50 GeV. Für noch höhere Energien müssen Linearbeschleuniger gebaut werden. Am TESLA-Projekt für einen 33 km langen Elektronen-Positronen-Collider mit einer Energie im Wechselwirkungspunkt von 500 GeV wird im DESY Hamburg gearbeitet. Auf der Basis der supraleitenden TESLA-Beschleunigungsstrukturen wird derzeit im Forschungszentrum Rossendorf ein 40-MeV-Linearbeschleuniger für Elektronen aufgebaut. In Zukunft werden mit diesem Beschleuniger kern- und strahlungsphysikalische Forschungsarbeiten durchgeführt sowie kohärente Infrarotstrahlung (Freier-Elektronen-Laser) für materialwissenschaftliche Untersuchungen erzeugt.
Keywords: Beschleuniger, Elektronen, Ionen
  • Lecture (others)
    Lehrerfortbildung 1999 im Forschungszentrum Rossendorf, 26. August 1999

Publ.-Id: 2475 - Permalink


Blue photoluminescence from high-dose Si+- and Ge+-implanted silicon-dioxide layers
Tyschenko, I. E.; Kachurin, G. A.; Zhuravlev, K. S.; Pazdnikov, N. A.; Volodin, V. A.; Gutakovsky, A. K.; Leier, A. F.; Fröb, H.; Leo, K.; Böhme, T.; Rebohle, L.; Yankov, R. A.; Skorupa, W.;
  • Lecture (Conference)
    Int. Workshop des Innovationskollegs der TU Chemnitz "Methoden und Materialsysteme für den Nanometerbereich", Schöneck/Vogtl., March 3 - 5, 1997

Publ.-Id: 2474 - Permalink


A computational model of the formation of (SiC)1-x(AlN)x structures by hot, high-dose N+ and Al+ coimplants in 6H-SiC
Trushin, Y. V.; Yankov, R. A.; Kharlamov, V. S.; Kulikov, D. V.; Tsigankov, D. N.; Kreißig, U.; Voelskow, M.; Pezoldt, J.; Skorupa, W.;
  • Lecture (Conference)
    Int. Conf. on Silicon Carbide, III-Nitrides and Related Materials, Stockholm, Sweden, Aug. 31 - Sept. 5, 1997

Publ.-Id: 2473 - Permalink


Formation and self-organization of nanoclusters by ion beam synthesis: a combined atomistic and continuum description
Strobel, M.; Heinig, K.-H.; Möller, W.;
  • Lecture (Conference)
    MRS Fall Meeting, Boston, USA, Dec. 1-5, 1997

Publ.-Id: 2472 - Permalink


Computersimulationen zur Evolution von Nanoclustern
Strobel, M.; Heinig, K.-H.; Möller, W.;
  • Lecture (Conference)
    Frühjahrstagung der DPG, Münster, Germany, March 17-21, 1997

Publ.-Id: 2471 - Permalink


A comparative study of ERDA, EELS and XPS for structural analysis of amorphous carbon nitride films
Späth, C.; Kühn, M.; Richter, F.; Falke, U.; Hietschold, M.; Kilper, R.; Kreißig, U.;
  • Lecture (Conference)
    Int. Conf. Diamond '97

Publ.-Id: 2470 - Permalink


MeV-Implantation in Silicium
Skorupa, W.;
  • Lecture (Conference)
    20. Dt. Nutzertreffen Ionenimplantation, SIMEC-Werk der Siemens AG, Dresden, Oct. 29 -30, 1997

Publ.-Id: 2469 - Permalink


Composition, structural and hardeness change of aluminium implanted with carbon
Segrouchni, Z.; Betzl, M.; Richter, E.;
  • Lecture (Conference)
    SMMIB 97, Gatlinburg, TE, USA, Sept. 1997

Publ.-Id: 2468 - Permalink


Abscheidung von Si/SiO2-Cluster-Schichten durch reaktives Magnetron-Sputtern
Seifarth, H.; Grötzschel, R.; Markwitz, A.; Matz, W.; Nitsche, P.; Rebohle, L.;
  • Lecture (Conference)
    8. Bundesdeutsche Fachtagung Plasmatechnologie, Dresden, Sept. 14 - 17, 1997

Publ.-Id: 2467 - Permalink


Atomistic modeling of ion implantation within a 2d process simulator
Schmidt, B.; Posselt, M.; Strecker, N.; Feudel, T.;
  • Lecture (Conference)
    MRS Fall Meeting, Boston, USA, Dec. 1 - 5, 1997
  • Contribution to external collection
    Mat. Res. Soc. Symp. Proc. 490 (1998) 21

Publ.-Id: 2466 - Permalink


Applying ANSYS/Multiphysics to In-Vessel and Ex-Vessel Core Melt Phenomena
Willschütz, H.-G.;
For future nuclear power plants it is demanded that there are no consequences for the environment and the population even in the closest vicinity of the plant during and after every possible accident scenario. This includes the hypothetical scenario of a severe accident with subsequent core meltdown, corium relocation and formation of a melt pool with internal heat sources in the reactor pressure vessel (RPV) lower head (LH). Some reactor concepts have the aim to arrest the melt in the lower head removing the decay heat by external water flooding. In other concepts a dry reactor pit is designed and after the vessel failure a core catcher shall assure the long term stabilization of the corium within the containment.

For both strategies investigations on the transient behaviour of the RPV or of the core catcher are necessary. Two kinds of vessel failure can be distinguished: thermal and structural failure. Thermal failure means that the heat flux through the vessel wall becomes so high that the steel solidus temperature at any position of the vessel outside is exceeded. Structural failure means that a combination of thermal and mechanical loads causes the failure, e. g. the wall thickness of the vessel is reduced by thermal ablation and at the same time the internal pressure and the gravitational forces induce creeping with subsequent creep failure.

Different melt configurations can be assumed. They can be distinguished by the melt masses released into the LH, the melt composition, the segregation behaviour of the oxidic and the metallic component, and the density and the distribution of the internal heat sources. One of the most dangerous accident scenarios for a pressurized water reactor (PWR) assumes the relocation of a melt mass in the range of 200 Mg or more which is segregated into some 150 Mg of the heavier oxidic component at the bottom and some 50 Mg of a metallic melt above. The oxidic melt is surrounded by an oxidic crust due to the high solidification temperature of the oxide. The internal heat sources are mainly in the oxidic component, but due to the geometric configuration and the different fluid properties the highest heat fluxes and the major thermal ablation is expected between the metallic layer and the vessel wall. This phenomenon is called focussing effect.

An in-vessel-scenario of a PWR has been assumed and modelled with ANSYS/ Multiphysics. Using this Finite Element (FE) code package it is possible to simulate the velocity and temperature field for a fluid region and the corresponding temperature field within the surrounding solid structures. This thermo-fluiddynamic calculation can be coupled with a mechanical FE-model of the solid structures to analyse the stress and possible creeping forced by the mechanical and thermal loads. In this presentation, the recent modelling approach and the results obtained with the code ANSYS/Multiphysics are discussed. An outlook on the further development is given.

Keywords: Severe Accident, Core Meltdown, In-Vessel-Retention, Core Catcher, Finite Element Code, Transient Calculation, Computational Fluid Dynamics, Coupled Solid Structures, Thermal Failure, Structural or Creep Failure
  • Lecture (others)
    Seminar held at the Division of Nuclear Power Safety at the Royal Institute of Technology, Stockholm, Sweden, August 2nd, 1999.

Publ.-Id: 2465 - Permalink


Dünnschichtsysteme für die Photo- und Elektrolumineszenz
Schmidt, B.; von Borany, J.; Grötzschel, R.; Heinig, K.-H.; Markwitz, A.; Matz, W.; Nitzsche, P.; Rebohle, L.; Seifarth, H.; Strobel, M.; Skorupa, W.;
  • Lecture (Conference)
    Photonik-Symposium, Würzburg, Oct. 8 - 10, 1997

Publ.-Id: 2460 - Permalink


Influence of the substrate structure (SIMOX, bulk Si) on the SiC synthesis by high dose carbon implantation
Romano-Rodriguez, A.; Kögler, R.; Bachrouri, A.; Perez-Rodriguez, A.; Serre, C.; Reuther, H.; Voelskow, M.; Skorupa, W.; Calvo-Barrio, L.; Morante, J. R.;
  • Lecture (Conference)
    7th Int. Conf. on Gettering and Defect Engineering in Semiconductor Technology, GADEST'97, Spa, Belgium, Oct. 5-10, 1997

Publ.-Id: 2459 - Permalink


Nitrierung austenitischer Edelstähle mittels Plasma-Immersions-Ionenimplantation
Richter, E.;
  • Lecture (Conference)
    OWT-97, Chemnitz, June 16-18, 1997

Publ.-Id: 2458 - Permalink


The influence of heat treatment during the implantation of oxygen into magnesium
Richter, E.; Reuther, H.; Kreißig, U.;
  • Lecture (Conference)
    SMMIB 97, Gatlinburg, TE, USA, Sept. 1997

Publ.-Id: 2457 - Permalink


Investigation of Fe-Mg-alloys produced by ion implantation
Reuther, H.; Betzl, M.; Matz, W.; Richter, E.;
  • Lecture (Conference)
    10th Int. Conf. Surface Modification of Metals by Ion Beams, Gatlinburg, USA, Sept. 21 - 26, 1997

Publ.-Id: 2456 - Permalink


Angle dependent Mössbauer spectroscopy on beta-FeSi2 single crystals
Reuther, H.; Behr, G.; Dobler, M.; Teresiak, A.;
  • Lecture (Conference)
    Int. Conf. Appl. Mössbauer Effect, Rio de Janeiro, Brazil, Sept. 14 - 20, 1997

Publ.-Id: 2455 - Permalink


Alloying by high dose ion implantation of iron into magnesium and aluminium
Reuther, H.;
  • Invited lecture (Conferences)
    Int. Conf. Appl. Mössbauer Effect, Rio de Janeiro, Brazil, Sept. 14 - 20, 1997 (invited lecture)

Publ.-Id: 2454 - Permalink


XRS and TEM investigations on argon profiled metal-silicon thin films
Reiche, R.; Oswald, S.; Thomas, J.; Wetzig, K.; Reuther, H.; Dobler, M.;
  • Lecture (Conference)
    7th European Conf. Appl. Surf. Interface Analysis, Göteborg, Sweden, June 16 - 20, 1997

Publ.-Id: 2452 - Permalink


Erzeugung blauer Lumineszenzzentren durch Ionenstrahlsynthese
Rebohle, L.; Tyschenko, I. E.; Fröb, H.; Leo, K.; Yankov, R. A.; Skorupa, W.;
  • Lecture (Conference)
    DPG-Frühjahrstagung, Münster, March 17 - 21, 1997

Publ.-Id: 2451 - Permalink


Strong blue photo-and electroluminescence from ion beam synthesized Ge-rich SiO2-layers
Rebohle, L.; von Borany, J.; Grötzschel, R.; Markwitz, A.; Schmidt, B.; Tyschenko, I. E.; Skorupa, W.; Fröb, H.; Leo, K.;
  • Lecture (Conference)
    II. Int. Workshop on Light Emitting Low Dimensional Silicon Structures, Lagonissi-Attiki, Greece, June 23 - 25, 1997

Publ.-Id: 2450 - Permalink


Das ROBL-Strahlrohr an der ESRF: (Röntgenoptik und Strahlcharakteristika, der MRH-Meßplatz)
Prokert, F.; Betzl, M.; Eichhorn, F.; Matz, W.; Schell, N.;
  • Lecture (Conference)
    Workshop "Strukturanalyse von Kristalloberflächen und dünnen Schichten mit Synchrotronstrahlung", LMU München, Oct. 8 - 10, 1997

Publ.-Id: 2449 - Permalink


Modeling of implantation damage in silicon
Posselt, M.;
  • Invited lecture (Conferences)
    Int. Workshop on Challenges in Predictive Process Simulation (ChiPPS'97), Wandlitz, Germany, Aug. 17 - 20, 1997 (invited lecture)

Publ.-Id: 2448 - Permalink


Computer simulation of random-to-channeling and blocking-to-channeling transitions
Posselt, M.;
  • Invited lecture (Conferences)
    Workshop on Channeling and Blocking Effects with Heavy Ion Beams, München, Germany, April 18 - 19, 1997 (invited lecture)

Publ.-Id: 2447 - Permalink


Growth and characterization of boron nitride thin films
Plass, M. F.; Fukarek, W.; Kolitsch, A.; Möller, W.;
  • Lecture (Conference)
    SMMIB 97, Gatlinburg, TE, USA, Sept. 1997

Publ.-Id: 2446 - Permalink


Characterization of noncubic boron nitride films grown by a nonnormal angle of ion bombardment
Plass, M. F.; Fukarek, W.; Kolitsch, A.; Mücklich, A.; Möller, W.;
  • Lecture (Conference)
    ICMCTF 97, San Diego, USA

Publ.-Id: 2445 - Permalink


Infrared investigation and ion beam analysis of boron nitride coatings
Plass, M. F.; Fukarek, W.; Kolitsch, A.; Möller, W.;
  • Lecture (Conference)
    E-MRS '97 Spring Meeting, Strasbourg, France, June 16-20, 1997

Publ.-Id: 2444 - Permalink


Structural studies of buried (SiC)1-x(AlN)x layers fabricated by co-implantation of nitrogen and aluminium ions in 6H-SiC
Pezoldt, J.; Yankov, R. A.; Fukarek, W.; Hatzopoulos, N.; Voelskow, M.; Kreißig, U.; Mücklich, A.; Brauer, G.; Anwand, W.; Heera, V.; Skorupa, W.;
  • Lecture (Conference)
    7th Int. Conf. on Defect Recognition and Image Processing in Semiconductors (DRIP VII), Templin, Germany, Sept. 7 - 10, 1997

Publ.-Id: 2443 - Permalink


Ion beam sensitizing of titanium surfaces to hydroxyapatite formation
Pham, M. T.; Matz, W.; Reuther, H.; Richter, E.; Steiner, G.; Oswald, S.;
CaO and P2O5 containing Ti surfaces were prepared and examined for their bioactivity. The preparation involved the incorporation of Ca and P into Ti by ion implantation to a total dose of up to 8 x 1017 ions/cm² with a 1.7 Ca/P ratio and a subsequent oxidation at 500 °C in O2 for 40 min. The model surfaces were examined for their reactivity toward hydroxyapatite formation by microscopically recording the mineralization in a simulated body fluid. The ion implantation modified surfaces were shown to exhibit enhanced mineralization by inducing heterogeneous nucleation, growth, and proliferation of hydroxyapatite, relative to a control sample of pure Ti. The surface induced reactivity was shown to relate to the enhanced provision of the ionic mineral components Ca2+ and HPO42- directly supplied from the surface and the substrate-mediated nucleation by hydroxylated surface TiO2.
Keywords: biomaterials, ion implantation, surface coatings, Ti, hydroxyapatite
  • Contribution to proceedings
    Proceedings of the Eleventh International Conference on Surface Modification of Metals by Ion Beams (SMMIB'99), Sept. 19-14, 1999, Beijing, P.R. China.
  • Surface & Coatings Technology 128-129 (2000) 313-319

Publ.-Id: 2442 - Permalink


Ion beam synthesis and characterization of buried (SiC)1-x(AlN)x layers in 6H-SiC
Pezoldt, J.; Yankov, R. A.; Fukarek, W.; Hatzopoulos, N.; Brauer, G.; Anwand, W.; Kreißig, U.; Mücklich, A.; Voelskow, M.; Heera, V.; Skorupa, W.;
  • Lecture (Conference)
    39th Electronic Materials Conf., Fort Collins, Colorado, USA, June 25-27, 1997

Publ.-Id: 2441 - Permalink


Roles of implantation parameters on the formation of expanded austenite
Parascandola, S.; Betzl, M.; Richter, E.; Möller, W.;
High-current ion implantation of nitrogen into austenitic stainless steel (AISI 316Ti) at temperatures about 400°C results in the formation of a surface layer, called expanded austenite. A tensor of nitrogen ion energies (1.2, 2.0 and 2.8 keV), ion fluxes (0.2 and 1.0 mA/cm2) and times (2, 10 and 40 min.) has been selected to investigate the roles of the implantation parameters: ion energy, current density and treatment time. In addition, a temperature series has been performed over the range from 280°C to 480°C at fixed processing conditions of 1.2 keV, 0.5 mA/cm2 and 20 min. Nitrogen content and layer thickness have been determined by nuclear reaction analysis. Structural and micromechanical analyses have been performed by X-ray diffraction and microhardness measurements.
  • Poster
    SMMIB 97, Gatlinburg, TE, USA, Sept. 1997

Publ.-Id: 2440 - Permalink


Stickstoffdiffusion in austenitischem Edelstahl unter Hochstrom-Ionenimplantation
Parascandola, S.; Günzel, R.; Grötzschel, R.; Richter, E.; Möller, W.;
Die Hochstrom-Ionenimplantation von Stickstoff ermöglicht die Aufstickung von Oberflächen bei niedrigen Temperaturen und in kurzen Zeiten. Die Tribologie von austenitischen Edelstählen kann durch diesen Prozeß extrem verbessert werden. Das Diffusionsverhalten von hochstrom-implantiertem Stickstoff in austenitischem Edelstahl wird untersucht. Dazu werden die Stickstoffprofile von 14N und 15N implantierten Proben mit Kernreaktionsanalyse (NRA) bestimmt und die Oberflächen mit Röntgenbeugungsspektroskopie (XRD) auf strukturelle Veränderungen analysiert. Verschiedene Diffusionsszenarien werden diskutiert und auf Konsistenz mit den experimentellen Ergebnissen getestet.
  • Lecture (Conference)
    DPG Frühjahrstagung Münster, March 18, 1997

Publ.-Id: 2439 - Permalink


Surface excitation processes of adsorbed gas molecules on metal surface
Obara, K.; Yiji, P.; Chiba, K.; Fukarek, W.; Möller, W.;
  • Lecture (Conference)
    ICRP-3/SPP-14, Nara, Jan. 1997

Publ.-Id: 2437 - Permalink


Positron annihilation spectroscopy, electrical resistivity, and microstructural transmission electron microscopy studies of the CuMn system
Nicht, E.-M.; Brauer, G.; Vostry, P.; Cieslar, M.; Blasek, P.;
  • Lecture (Conference)
    11th Int. Conf. on Positron Annihilation (ICPA-11), Kansas City, USA, May 25-30, 1997

Publ.-Id: 2436 - Permalink


Direct measurements of high-energy secondary electrons during plasma immersion ion implantation
Nakamura, K.; Mändl, S.; Brutscher, J.; Günzel, R.; Möller, W.;
  • Lecture (Conference)
    3rd Int. Conf. Reactive Plasmas, Nara, Japan, Jan. 21 - 24, 1997

Publ.-Id: 2435 - Permalink


Synchrotron Mössbauer reflectometry: feasibility of depth selective phase analysis of thin films and multilayers
Nagy, D. L.; Bottyan, L.; Deak, L.; Gerdau, E.; Gittsovich, V. N.; Korecki, J.; Leupold, O.; Reuther, H.; Semenov, V. G.; Szilagyi, E.;
  • Lecture (Conference)
    XXXII Zakopane School of Physics, May 10 - 17, 1997

Publ.-Id: 2434 - Permalink


Structure and magnetic properties in the low temperature annealing range of FeZrBCu-base alloys
Müller, M.; Grahl, H.; Mattern, N.; Schnell, B.; Reibold, M.; Reuther, H.;
  • Lecture (Conference)
    Soft Magnetic Materials 13, Grenoble, Sept. 24 - 26, 1997

Publ.-Id: 2433 - Permalink


In-situ diagnostics using high-energy ion beam analysis
Möller, W.; Fukarek, W.; Grigull, S.; Kruse, O.; Parascandola, S.;
  • Invited lecture (Conferences)
    13th Int. Conf. on Ion Beam Analysis (IBA-13), Lisboa, Portugal, July 1997 (invited lecture)

Publ.-Id: 2432 - Permalink


Positronen-Emissions-Tomographie zur Untersuchung von Zweiphasenströmungen
Hensel, F.;
Die Technik der Positronen-Emissions-Tomographie (Positron Emission Tomography, PET) ist ein bildgebendes Verfahren, das für die Nuklearmedizin entwickelt wurde. Im medizinischen Bereich wird diese Technik hauptsächlich als nichtinvasives Untersuchungsverfahren für die quantitative Erfassung von Stoffwechselvorgängen in-vivo genutzt. Hierzu werden die interessierenden Stoffsysteme mit Positronen emittierenden Nukliden wie 11C, 13N, 15O oder 18F markiert. Die Halbwertszeiten dieser Nuklide liegen im Bereich einiger Minuten bis zu einigen Stunden. In einer Vielzahl von organischen Verbindungen können damit die natürlich vorkommenden Nuklide durch ein β+-instabiles Isotop ersetzt werden.

Die Methode Verfahren PET wurde zur Untersuchung von Zweiphasenströmungen gasförmig / flüssig angewendet. Inhalt des Vortrages sind die Darstellung von Ergebnissen der Messung des Dispersionskoeffizienten in einer turbulenten Blasenströmung und die Vorstellung geplanter Anwendungen dieser Tracertechnik in einem derzeit in Aufbau befindlichen PET-Tomographen für Schaumuntersuchungen.

  • Lecture (Conference)
    Workshop "Meßtechnik für stationäre und transiente Mehrphasenströmungen", Rossendorf, 24.-25.September 1998
  • Contribution to HZDR-Annual report
    Prasser, Horst-Michael: (Hrsg.): Workshop "Meßtechnik für stationäre und transiente Mehrphasenströmungen", Forschungszentrum Rossendorf; FZR-241, 1998, 91-96

Publ.-Id: 2430 - Permalink


Ionenstrahlen zur Modifizierung und Analyse von Oberflächen
Möller, W.;
  • Invited lecture (Conferences)
    GDCh-Tagung "Oberflächenanalytik", Chemnitz, June 25, 1997 (invited lecture)

Publ.-Id: 2429 - Permalink


Basic aspects and applications of plasma immersion ion implantation
Möller, W.;
  • Invited lecture (Conferences)
    German-Japanese Seminar "Physics and Application of Low-Pressure Plasmas", Bad Honnef, June 18, 1997 (invited lecture)

Publ.-Id: 2428 - Permalink


Physik und Anwendungen der Plasma-Immersions-Ionenimplantation
Möller, W.;
  • Invited lecture (Conferences)
    VDE/ITG-Seminar "Teilchenstrahl- und Plasmatechnik", Helmsdorf b. Dresden, March 7, 1997 (invited lecture)
  • Lecture (others)
    Elektrotechnisches Kolloquium der Univ. Stuttgart, Jan. 23, 1997

Publ.-Id: 2427 - Permalink


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