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41504 Publications

Test und Berechnung des passiven Notkondensators

Schaffrath, A.; Hicken, E. F.; Jaegers, H.; Prasser, H.-M.

The Siemens AG is developing the new innovative boiling water
reactor concept SWR1000. New features are the passive safety
systems (e.g. emergency condensers, building condensers, passive
pressure pulse transmitters).
For the experimental investigation of the emergency condenser
effectiveness, the NOKO test facility has been constructed at
the Forschungszentrum Jülich in cooperation with Siemens. The
facility has an operating pressure of 10 MPa and a maximum power
of 4 MW for steam production. The condenser bundle consists of 8
tubes and is fabricated with the geometry and material as planned
for the SWR. In more than 200 experiments, the emergency condenser
capacity was tested as a function of pressure, water level and
concentration of noncondensables in the pressure vessel as well as
pressure, water level and temperature in the condenser.
Posttest calculations of NOKO experiments were performed with an
improved version of ATHLET. To calculate the heat transfer coefficients
during condensation in horizontal tubes the module KONWAR has been
developed and implemented in ATHLET. KONWAR is based on the flow regime
map of Tandon and includes several semiempirical correlations for the
determination of the heat transfer coefficients. The presented comparison
between calculations and experiments shows a good agreement

  • Atomwirtschaft-Atomtechnik 42 (1997), Nr. 11, S. 697-700

Permalink: https://www.hzdr.de/publications/Publ-986

Analysis and Calculation of an Accident with Delayed Scram on NPP Greifswald Using the Coupled Code DYN3D/ATHLET

Kliem, S.

Analysis and calculation of an abnormal event which occurred in 1989 at the NPP Greifswald (VVER-440/213) are reported about. This event was a scram failure at about 50% nominal power with two of six working main coolant pumps (MCP). The analysis revealed remarkable differences between the active and passive loops due to non-homogeneous coolant mixing in the downcomer and lower plenum in the initial state before the accident. An existing input data deck for the coupled code DYN3D/ATHLET was modified to carry out calculations of this accident. On account of the absence of a mixing model considering loops with forward and loops with backward flow at the same time, the six reactor loops were modeled by a 3-fold (passive), a 2-fold (active) and a single (with the MCP to be switched-off at the beginning of the transient) loop. The comparison of the stationary calculation with the reported data shows a good agreement taking into account the mentioned deviations between the loops. Most of the calculated thermohydraulic parameters during the accident are very close to the measured data. Deviations in the loop temperatures can be explained by the differences in the measured stationary data and by the fact of non-homogeneous coolant mixing in the downcomer and the lower plenum. A small, but continuous power increase was observed during the whole time in the calculation while the measured power was remaining nearly constant. The power behaviour was brought into agreement with the measured data by a correction of the moderator temperature coefficient within the accuracy recommendations of the Atomic Energy Research (AER).
The calculation of this accident is an important contribution to the validation of the coupled code DYN3D/ATHLET. It demonstrated problems of the analysis of real abnormal events on NPP`s.

  • Contribution to proceedings
    Proc. 7th Symposium of AER, pp.457-468, KFKI Atomic Energy Research Institute, Budapest (1997)
  • Lecture (Conference)
    7th Symposium of AER

Permalink: https://www.hzdr.de/publications/Publ-985

Experimentelle Ergebnisse mit der NOKO-Versuchsanlage

Schaffrath, A.; Hicken, E. F.; Jaegers, H.; Prasser, H.-M.

On the NOKO (emergency condenser) test station constructed at Jülich Research Centre, the operating performance and effectiveness of the emergency condenser of the boiling water reactor 1000 have been determined in well over 200 tests. It has been possible to check that the tests were in close agreement with a modified version of ATHLET

  • VGB-Kraftwerkstechnik 78 (1998), Heft 5, ISSN 0372-5715, S. 90-96

Permalink: https://www.hzdr.de/publications/Publ-984

SANS Investigations of the Microstructure of VVER-440-Type RPV Steel after Low Temperature Irradiation at 60 grd C

Grosse, M.; Böhmert, J.; Gilles, R.

  • Poster
    Annuals User's Meeting, Hahn-Meitner-Institut, Berlin, November 1997, Posterbeitrag

Permalink: https://www.hzdr.de/publications/Publ-983

Perspektiven der Windenergienutzung in den neuen Bundesländern

Rindelhardt, U.

Der Stand und die Perspektiven der Windenergienutzung in den neuen Bundesländern unterscheidet sich nicht grundsätzlich von der Situation in den alten Ländern. In einigen Fragen (flächendeckende Potentialerhebungen, durchschnittliche WEA-Größe) ist der Stand sogar höher zu bewerten. Die weitere Entwicklung der Windenergienutzung wird bestimmt durch
- die mittelfristig mögliche Senkung der Stromgestehungskosten (Anforderungen an die Standortwahl und Standortnutzung),
- den praktischen Nachweis von Zuverlässigkeit und Lebensdauer der eingesetzten Anlagen,
- den künftigen ordnungspolitischen Rahmen für die Windenergienutzung (Zielkonflikt Liberalisierung der Strommärkte und Reduktion CO2-Ausstoß) sowie
- die politische und soziale Akzeptanz der Windenergienutzung.
Neben Wissenschaftlern und Technikern steht hier auch die Politik vor einer großen Herausforderung.

  • Lecture (Conference)
    Tagungsband "Windenergienutzung im Binnenland", S. 168 -178 Kassel, 8./ 9. Oktober 1997
  • Contribution to proceedings
    Tagungsband "Windenergienutzung im Binnenland", S. 168 -178 Kassel, 8./ 9. Oktober 1997

Permalink: https://www.hzdr.de/publications/Publ-982

Definition of the Fifth Dynamic AER Benchmark Problem - A Benchmark for Coupled Thermohydraulic/ Three-Dimensional Hexagonal Neutron Kinetic Codes

Kliem, S.

The fifth dynamic benchmark defined in this paper is the first benchmark for coupled thermohydraulic system/three-dimensional neutron kinetic core models. In this benchmark the interaction between the components of a VVER-440 NPP with the reactor core should be investigated.

The initiating event is a symmetrical break of the main steam header (MSH) at the end of the first fuel cycle and hot shutdown conditions with one stuck out control rod group. The main purpose is the investigation of recriticality. For this reason, the calculation should be continued until the power excursion is eventually terminated by high-borated water from the high pressure injection system.

The participants of the benchmark should use own input data decks developed according to the needs of their own codes. The main geometrical parameters and characteristics of control and safety systems to be considered in this benchmark will be given to bring into agreement the data decks. Own best estimate nuclear cross section data should be used in the calculation. Only the initial subcriticality at the beginning of the transient will be given to made the results more comparable.

  • Contribution to proceedings
    Proc. 7th Symposium of AER, pp.429-438 , KFKI Atomic Energy Research Institute, Budapest (1997)
  • Lecture (Conference)
    7th Symposium of AER

Permalink: https://www.hzdr.de/publications/Publ-981

EXAFS Investigations of the Interaction of Humic Acids and Model Compounds with Uranyl Cations in Solid Complexes

Denecke, M. A.; Reich, T.; Pompe, S.; Bubner, M.; Heise, K.-H.; Nitsche, H.; Allen, P. G.; Bucher, J. J.; Edelstein, N. M.; Shuh, D. K.; Czerwinski, K.

Permalink: https://www.hzdr.de/publications/Publ-980

Bremsstrahlung in intermediate-energy nucleon reactions within an effective one-beson exchange model

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

Abstract
Within a covariant effective one-boson exchange model for the T matrix of NN interactions we present detailed calculations of bremsstrahlung cross sections for proton - proton and proton - neutron reactions at beam energies in the 1 GeV region. Besides pure bremsstrahlung processes we consider photons from ∆ decays and contributions from the η → γγ process. At beam energies above 700 MeV the ∆ decay channel dominates the spectra at large photon energies, where the interference between non-resonance processes and the ∆ decay channel becomes also important. Low energy photons stem from pure bremsstrahlung processes. The available experimental data at 730 MeV beam energy is well described. We extrapolate the model down to 280 MeV, where more detailed experimental data exist, and find agreement with angular distributions.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-191
    ISSN: 1436-3976
  • Nuclear Physics A 628 (1998) 255-274

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Permalink: https://www.hzdr.de/publications/Publ-979

Precipitation Studies in Oxygen- and Nitrogen Rich Silicon Formed by High Dose Implantation

Weber, R.; Müller, R.; Skorupa, W.

Permalink: https://www.hzdr.de/publications/Publ-978

CdS Nanocrystals Entrapped in Thin SiO2 Films

Pham, M. T.; Matz, W.; Möller, D.; Mücklich, A.; Oswald, S.

  • Journal of Physical Chemistry B Vol. 102, Number 21, Pages 4081-4088, 1998

Permalink: https://www.hzdr.de/publications/Publ-977

Correlation Between the Powder Structure and Microstructure of Tetragonal ZrO2 Ceramics

Haase, I.; Müller, R.

  • Poster
    European Ceramic Society, Third Conference, Madrid, September 12-17, 1993, P04-05 (Poster)

Permalink: https://www.hzdr.de/publications/Publ-976

Untersuchung der Wechselwirkungen zwischen ZrNb1 und austenitischem Stahl bei hohen Temperaturen

Müller, R.; Gleisberg, O.

  • Poster
    29. Kolloquium des Arbeitskreises für Elektronenmikroskopische Direktabbildung und Analyse von Oberflächen (EDO) 8.-11. Oktober 1996 in Münster
  • Elektronenmikroskop. Direktabb. und Analyse v. Oberfl., 29 (1996)

Permalink: https://www.hzdr.de/publications/Publ-975

Laserspektroskopie zur Bestimmung der chemischen Speziation von Uranylkomplexen

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

  • Poster
    Poster bei der Hauptjahrestagung der GDCh, Wien, Sept. 1997

Permalink: https://www.hzdr.de/publications/Publ-974

In-situ Laser Reflectometry Study of the Amorphization of Silicon Carbide by MeV Ion Implantation

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

Permalink: https://www.hzdr.de/publications/Publ-972

Institute of Safety Research; Annual Report 1996

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

The report gives an overview on the scientific work of the Institute of Safety Research in 1996.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-190 August 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-971

Estimats of Dilepton Spectra from Open Charm and Bottom Decays in Relativistic Heavy-Ion Collisions

Kämpfer, B.; Pavlenko, O. P.

Abstract
The spectra of lepton pairs from correlated open charm and bottom decays in ultrarelativistic heavy-ion collisions are calculated. Our approach includes energy loss effects of the fast heavy quarks in deconfined matter which are determined by temperature and density of the expanding parton medium. We find a strong suppression of the initial transverse momentum spectrum of heavy quarks due to the energy lass at LHC conditions. Within the central rapidity covered by the ALICE detector system, the dominant contribution from bottom decays to the high invariant mass dielectron spectrum is predicted.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-188
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-970

Thermal Open Charm Signals Versus Hard Initial Yields in ultrarelativistic Heavy-Ion Collisions

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

Abstract.

Exploiting a unique set of parton distribution functions we estimate hard processes for open charm, dilepton and mini-jet production. Assuming rapid thermalization within the mini-jet plasma we follow the evolution (expansion and chemical equilibration) of the parton matter and calculate the energy loss of charm quarks in this environment. A substantial part of charm is espected to thermalize. We try to estimate the thermalized open charm component in the final hadron spectra.

Permalink: https://www.hzdr.de/publications/Publ-969

Investigation of Oxidation Resistance of Carbon Based First-Wall Liner Material Aerolor AO5

Krüssenberg, A.-K.; Moormann, R.; Hinssen, H.-K.; Hofmann, M.; Wu, C. H.

Minimizing the consequences of loss of vacuum and loss of coolant into vacuum accidents with respect to fusion reactor design requires the choice of materials as oxidation resistant as possible. In continuation to the testing of carbon candidate materials under oxidizing conditions (oxygen and steam) in collaboration with NET the carbon compound Aerolor AO5 of Carbone Lorraine has been examined in detail in the test facilities INDEX 2 and SPALEX at Forschungszentrum Jülich. The parameters for these oxidation experiments in the in-pore diffusion controlled regime are temperature (from 973 K up to 1173 K for oxygen, from 1173 K up to 1423 K for steam) and reaction gas concentration (1 vol.-% - 20 vol.% oxygen in argon, 5 vol.% - 100 vol.% steam in argon). The deducted equations for the primary oxidation reactions consider the dependence of the reaction rate on temperature, partial pressure and burn-off of the material.

Permalink: https://www.hzdr.de/publications/Publ-968

Studies of Liquid-Gaseous Two-Phase Systems by Positron Emitting Radiotracers

Hensel, F.

For a more detailed knowledge and understanding of various industrial processes an in-situ visualization is required. Positron Emission Tomography is an imaging technique used in medical research as a tool to study brain and heart diseases, allowing a non-invasive in-vivo concentration measurement of labeled substances. The mentioned features got us to carry out feasibility investigations for PET-like radiotracer applications in the field of two-phase flow systems. The main aim was to observe mixing and flow phenomena in efficient spatial and time resolution.

Typical values for the stopping ranges of positrons produced by common PET isotopes in water are approximately 2mm. Typical densities of the liquid-gaseous two phase systems that were to investigate are below 10% of the density of water under normal conditions. So the positron range effect becomes very important. Therefore as a first step the spatial annihilation distribution of a solid positron source has been measured using a Ti-45 source and solid blocks of polystyrene and polyurethane foam. The experiments have been carried out using a double head spherical PET-scanner for treatment plan verification of 3D conformable radiation therapy [1]. The foam density amounted from 15 kg/m3 to 38 kg/m3. The feasibility of a range based density measuring technique using the positron range was successfully shown. The next steps in this field could be the setup of a density measurement system for foams, including a detector optimization that results in an easy to handle low cost experimental assembly. It should comprise an encapsulated positron source and 2-4 pairs of detectors to cover an enlarged density range.

Liquid positron emitting tracers were used for monitoring phenomena in bubbly flows. PET experiments often require high activities and quite long integration times for an image reconstruction. Due to activity limitations it has been tried to optimize the experimental setup. Good results were achieved using a nearly two-dimensional geometry in combination with a midplane backprojection. In the experiments mixing processes in bubbly flows were observed using a F-18 solution. The bubbly flows were created by air injection. The event data were collected in list mode. The time resolution for these experiments was below 1s (integration time for the data evaluation). Best choice was a time step value of 500ms. In a further experiment the drainage of a surfactant stabilized foam was investigated.

Transport processes in bubbly flows and foams seem to be adequate topics for investigation using a PET technique. Time resolutions of about 1 s and below can be achieved, depending on the problem. The main advantage of PET tracers is the fact that many organic substances can be labeled with positron emitting isotopes which is important for the component sensitive investigation of many industrial processes.

  • Contribution to proceedings
    3rd Topical Meeting on Industrial Radiation and Radioisotope Measurements and Applications, Conference Program and Abstracts, Raleigh, NC (USA), October 6-9, 1996, p. 101, ISBN 0-89448-645-2
    DOI: 10.1016/S0969-8043(97)00144-9
    Cited 6 times in Scopus
  • Applied Radiation and Isotopes 48 (1997), 1485 - 1492
  • Lecture (Conference)
    3rd Topical Meeting on Industrial Radiation and Radioisotope Measurements and Applications, Raleigh, NC (USA), October 6-9, 1996

Permalink: https://www.hzdr.de/publications/Publ-967

A numerical three-dimensional stability analysis of the MHD cylinder wake flow

Shatrov, V.; Mutschke, G.; Gerbeth, G.

  • Lecture (Conference)
    3rd Int. Conference Transfer Phenomena in Magnetohydrodynamic and Electroconducting Flows; September 22-26, 1997 (Assois, France), Vol. 2, pp. 323 - 328
  • Contribution to proceedings
    3rd Int. Conference Transfer Phenomena in Magnetohydrodynamic and Electroconducting Flows; September 22-26, 1997 (Assois, France), Vol. 2, pp. 323 - 328

Permalink: https://www.hzdr.de/publications/Publ-965

Investigation of the Atomic Interdiffusion and Phase Formation in Ion Beam Irradiated Thin Cu-Al and Ag-Al Multilayers by In-situ RBS and XRD

Markwitz, A.; Matz, W.; Waldschmidt, U.; Demortier, G.

Permalink: https://www.hzdr.de/publications/Publ-964

Test and Calculation of the Emergency Condenser of the SWR 1000

Schaffrath, A.; Prasser, H.-M.; Hicken, E. F.; Jaegers, H.

The Siemens AG is developing the new innovative boiling water reactor
concept SWR1000. New features are the passive safety systems (e.g.
emergency condensers, building condensers, passive pressure pulse
transmitters, gravitydriven core flooding lines).

For the experimental investigation of the emergency condenser effectiveness,
the NOKO test facility has been constructed at the Forschungszentrum Jülich
in cooperation with Siemens. This test facility has an operating pressure of
10 MPa and a maximum power of 4 MW for steam production. The emergency
condenser bundle consists of eight tubes and is fabricated with planned
geometry and material of the SWR1000. In more than 200 experiments, the
emergency condenser capacity was tested as a function of pressure, water
level and concentration of noncondensables in the pressure vessel as well
of pressure, water level and temperature in the condenser.

Post test calculations of NOKO experiments were performed with an improved
version of ATHLET. To calculate the heat transfer coefficients during
condensation in horizontal tubes the module KONWAR has been developed
and implemented in ATHLET. KONWAR is based on the flow regime map of
Tandon and includes several semiempirical correlations for the determination
of the heat transfer coefficients. The comparison between calculations and
experiments shows a good agreement.

  • Lecture (Conference)
    Post-SMIRT 14 International Seminar "Passive Safety Features in Nuclear Installations", S B2.27-B2.35, 25.-27. August 1997, Pisa, Italien
  • Contribution to proceedings
    Post-SMIRT 14 International Seminar "Passive Safety Features in Nuclear Installations", S B2.27-B2.35, 25.-27. August 1997, Pisa, Italien

Permalink: https://www.hzdr.de/publications/Publ-963

Non-destructive Evaluation of Glass Corrosion States

Mäder, M.; Grambole, D.; Herrmann, F.; Neelmeijer, C.; Schreiner, M.; Woisetschläger, G.

Permalink: https://www.hzdr.de/publications/Publ-962

Modelling of boron nitride: atomic scale simulations on thin film growth

Albe, K.; Möller, W.

Molecular-dynamics simulations on ion-beam deposition
of boron nitride are presented. A realistic Tersoff-like potential energy
function for boron nitride, which was specially fitted to ab initio-data,
has been used. The impact of energetic boron and nitrogen atoms on a c-BN
target is simulated with energies ranging from 10 to 600 eV. The structural
analysis of the grown films shows, that a loose, dominantly sp2-bonded
structure arises at high ion flux. In no case the formation of a sp3-bonded
phase is observed, but the obtained films partially reveal textured basal
planes as found in experiment. Two different growth regimes are identified
for ion energies above and below 100 eV.

  • Computational Materials Science 10 (1998) 111
  • Invited lecture (Conferences)
    E-MRS Spring Meeting, Symp. D: Computational Modeling of Issues in Materials Science, Strasbourg, France, June 16 - 20, 1997 (invited lecture)

Permalink: https://www.hzdr.de/publications/Publ-961

Preparation of SiO2 Films with embedded Si Nanocrystals by Reactive RF-Magnetron Sputtering

Seifarth, H.; Grötzschel, R.; Markwitz, A.; Matz, W.; Nitzsche, P.; Rebohle, L.

Permalink: https://www.hzdr.de/publications/Publ-960

Increased Tool Cutling Life of Drills by Ion Implantation

Hilke, R.; Mändl, S.

  • Other report
    8th International DAAAM Symposium: Intelligent Manufacturing & Automation, Dubrovnik, Croatia, Oct. 28-25, 1997

Permalink: https://www.hzdr.de/publications/Publ-959

Strömungsformen bei Kondensationsvorgängen im Notkondensator-Versuchsstand

Prasser, H.-M.; Böttger, A.; Schaffrath, A.

Im Rahmen des Forschungsvorhabens "Berechnung des passiven Notkondensators eines mit Naturumlauf arbeitenden innovativen Siedewasserreaktors (SWR600) mit ATHLET", das eng mit dem Forschungsvorhaben 15 NU 9050 "Notkondensator für einen Siedewasserreaktor mittlerer Leitung - Versuche zur Ermittlung der Leistung" verknüpft ist, wurden seitens des Forschungszentrums Rossendorf (FZR) e.V. im Rahmen eines F&E-Vertrages Auswertungen und Interpretationen von Messungen zu Strömungsformen und Kondensationsvorgängen im NOKO-Versuchsstand durchgeführt. Neben den Bündelversuchen wurden im NOKO-Versuchsstand mehrere Experimente im einem separaten, seitlich vom Bündel angeordneten und umfangreich instrumentierten Einzelrohr durchgeführt, um die Aussagesicherheit der Notkondensatorexperimente zu erhöhen und zusätzlich experimentelle Daten für die Validierung von Thermohydraulikprogrammsystemen (u. a. den ATHLET-Code) bereitzustellen. Hierbei geht es speziell um die Untersuchung der transienten Zweiphasenströmung innerhalb der Notkondensatorrohre hinsichtlich der dort anzutreffenden Strömungsformen, sowie die Bestimmung des volumentrischen Gasgehaltes an verschiedenen Stellen auf der Sekundärseite im Bündel bei unterkühltem und gesättigtem Sieden. Das NOKO-Einzelrohr wurde hierzu mit nadelförmigen Voidsonden ausgestattet. Durch die Nutzung von jeweils mehreren Sonden in zwei ausgewählten Strömungsquerschnitten wurde die Phasenverteilung während der Füllstandsabsenkung, d.h. beim Durchgang des Flüssigkeitsspiegels an den Sondenpositionen, in-stationär gemessen. Daraus läßt sich die Form der Phasengrenzfläche rekonstruieren. Neben den Messungen im Einzelrohr fanden, ebenfalls mit Nadelsonden, Messungen auf der Sekundärseite des NOKO-Bündels statt. Die Einzelrohr-Versuche an der NOKO-Anlage in Jülich haben gezeigt daß bei entsprechend geringer Konzentration von nichtkondensierbaren Gasen Schwälle und Pfropfen im Ansatz zu beobachten sind, die Vorhersagen bekannter Strömungskarten jedoch nicht zutreffen. Dort werden Schwälle und Pfropfen in wesentlich größerem Aumaß vorhergesagt. Die Aufstellung und Validierung eines einfachen Modells zur Berechnung des Druckverlustes im Wärmeübertragerrohr ist gelungen. Damit kann der Differenzdruck zwischen den Kollektoren ober besser ein an den Wärmeübertragerrohren direkt gemessener Differenzdruck zur Füllstandsmessung auf der Primärseite des Notkondensators herangezogen werden. Bei der Validierung mußten jedoch die experimentell ermittelten Volumina des nichtkondensierbaren Gases in die Berechnung einfließen. Der Mechanismus der Kondensationsbehinderung durch das nichtkondensierbare Gas wurde durch Gegenüberstellung der Sondendaten mit den Meßwerten der Thermoelemente im Einzelrohr im Detail untersucht.

  • Open Access Logo Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-186 Juli 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-958

Analysis of deuterium induced nuclear reactions giving criteria for the formation process of expanded austenite

Parascandola, S.; Günzel, R.; Grötzschel, R.; Richter, E.; Möller, W.

High current ion nitriding of austenitic stainless steel at temperatures of about 400°C leads to the formation of a surface layer, called expanded austenite. The formation of this layer is not well understood. Deuterium induced nuclear reaction analyses have been performed on austenitic stainless steel samples that were subsequently high current ion nitrided with low energy ion implantation of 15 N and 14 N. The obtained depth profiles yield criteria for the formation process of the expanded austenite. A trapping mechanism cannot be confirmed.

  • Nuclear Instruments and Methods in Physics Research B, 136-138 (1998) 1281
    DOI: 10.1016/S0168-583X(97)00844-6
    Cited 40 times in Scopus
  • Poster und Beitrag zu Sammelwerken / Proceedings of the Thirteenth International Conference on Ion Beam Analysis, Lisbon, Portugal, 27 July - 1 August 1997

Permalink: https://www.hzdr.de/publications/Publ-956

Comment on "On the Relation Between Unimolekular Reaction Rates and Overlapping Resonances"

Rotter, I.

Permalink: https://www.hzdr.de/publications/Publ-955

Initial Inter-Laboratory Testing of the Rossendorf-Oxford (ROX97) Secondary Standard for X-ray Analysis

Neelmeijer, C.; Mäder, M.; Jarjis, R.; Calligaro, T.; Salomon, J.; Schreiner, M.; Gantz, T.

Permalink: https://www.hzdr.de/publications/Publ-954

Estimates of Dilepton Spectra from Open Charm and Bottom Decays in Relativistic Heavy-Ions Collisions

Kämpfer, B.; Pavlenko, O. P.; Gallmeister, K.

Permalink: https://www.hzdr.de/publications/Publ-953

Determination of Structural Parameters of Uranyl Ion Complexed with Organic Acids Using EXAFS

Denecke, M. A.; Reich, T.; Bubner, M.; Heise, K.-H.; Nitsche, H.; Allen, P. G.; Bucher, J. J.; Edelstein, N. M.; Shuh, D. K.

Permalink: https://www.hzdr.de/publications/Publ-952

Synthetische Huminsäuren für die Umweltforschung

Heise, K.-H.; Pompe, S.; Bubner, M.; Nitsche, H.

  • Lecture (Conference)
    Arbeitstagung der Deutschen Gesellschaft für Moor- und Torfkunde e. V., Bad Elster, Germany, 04.-05.09. 1997

Permalink: https://www.hzdr.de/publications/Publ-951

LOWRAD 96; Methods and Applications of Low-Level Radioactivity Measurements; Proceedings of a Workshop Rossendorf/Dresden, 7-8 November 1996

Nitsche, H.; Niese, S.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-170
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-948

Nuclear and Hadron Physics and Project ELBE; Annual Report 1996

Barz, H.-W.; Dönau, F.; Enghardt, W.; Grosse, E.; Kämpfer, B.; Prade, H.; Schlett, M.; Wünsch, R.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-179 April 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-947

The Chiral Quark-Loop Soliton in a Hot Gas of Constituent Quarks

Schleif, M.; Wünsch, R.

Abstract
We consider a chiral one-loop hedgehog soliton of the bosonized SU(2)f Nambu & Jona-Lasinio model which is embedded in a liot medium of constituent quarks. Energy and radius of the soliton are determined in self-consistent mean-field approximation. Quasi-classical corrections to the soliton energy are derived by means of the pushing and cranking approaches. The corresponding inertial parameters are evaluated. It is shown that the inertial mass is equivalent to the total internal energy of the soliton. Corrected nucleon and ∆ isobar masses are calculated in dependence on temperature and density of the medium. As a result of the internal structure of the soliton which is controlled by the self-consistent mean field, the scaling between constituent quark mass and soliton mass is noticeable disturbed.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-182
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-946

Ionendriftprozesse in Borsilikatgläsern während des anodischen Bondens

Nitzsche, P.; Lange, K.; Schmidt, B.; Grigull, S.; Kreißig, U.; Huber, H.; Assmann, W.; Thomas, B.; Herzog, K.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-184 Juli 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-944

N.C.A.11C-Labelling of Benzenoid Compounds in Ring Positions: [11C]Anisole Derivatives

Mäding, P.; Steinbach, J.; Johannsen, B.

The synthesis route to n.c.a. 3-nitro-[3-C-11]anisole (3) by use of the principle of synchronous six-electron cyclization of hexatriene systems into aromatics is described and discussed. Nitro-[C-11]-methane (1) reacts with the prepared precursor 5-dimethylamino-2-methoxy-penta-2,4-dienylidene-1-dimethylammonium tetrafluoroborate (2b) in the presence of BuLi to form 1-dimethylamino-4-methoxy-6-nitro-[6-C-11]hexatriene (IA, IB), followed by cyclization/ aromatization into 3. Starting from 1, 3-nitro-[3-C-11]anisole of a radiochemical purity of about 65 % and a mean specific radioactivity of 1 Ci/mu mol was obtained within 10 min. Related to [C-11]CH3NO2, the reproducible radiochemical yield of 3 (decay-corrected) was 60+/-5 %. Reduction of 3 by heating the above reaction mixture with aqueous Na2S gave 3-amino-[3-C-11]anisole (4) of a radiochemical purity of about 50 %. The reproducible radiochemical yield of 4 (decay-corrected) in relation to 1 was 45+/-5 %, the synthesis time from 1 was 16 min.

  • Journal of Labelled Compounds and Radiopharmaceuticals 39 (7): 585-599 JUL 1997

Permalink: https://www.hzdr.de/publications/Publ-942

Sheath and Presheath Dynamics in Plasma Immersion Ion Implantation

Mändl, S.; Günzel, R.; Möller, W.

  • Journal of Physics D: Applied Physics 31 (1998) 1109-1117

Permalink: https://www.hzdr.de/publications/Publ-940

Helium Bubbles in Silicon: Study of the Residual Helium Content using Elastic Recoil Detection Analysis

Kaschny, J. R.; Fichtner, P. F. P.; Mücklich, A.; Kreißig, U.; Yankov, R. A.; Skorupa, W.

  • Lecture (Conference)
    13th Int. Conf. on Ion Beam Analysis (IBA-13), Lissabon, Portugal, July 27 - Aug 1, 1997
  • Contribution to external collection
    Nucl. Instr. Meth. B136-138 (1998) 583

Permalink: https://www.hzdr.de/publications/Publ-939

Identification and Discrimination of Thiobacilli Using ARDREA, RAPD and Rep-APD

Selenska-Pobell, S.; Otto, A.; Kutschke, S.

Permalink: https://www.hzdr.de/publications/Publ-938

In Situ ERDA Studies of Ion Drift Processes

Kreißig, U.; Grigull, S.; Lange, K.; Nitzsche, P.; Schmidt, B.

  • Nuclear Instruments and Methods in Physics Research B ( IBA '97)

Permalink: https://www.hzdr.de/publications/Publ-937

Angle dependent Mössbauer Spectroscopy

Reuther, H.; Behr, G.

  • Contribution to external collection
    Hyperfine Interactions ( ICAME '97 Conf. Proc.)

Permalink: https://www.hzdr.de/publications/Publ-936

Alloying by High Dose Ion Implantation of Iron into Magnesium and Aluminium

Reuther, H.; Betzl, M.; Matz, W.; Richter, E.

Permalink: https://www.hzdr.de/publications/Publ-935

Phase Formation of Iron Silicides by Ion Implantation

Dobler, M.; Reuther, H.; Möller, W.

  • Hyperfine Interactions (C) 3 (1998) 145-148

Permalink: https://www.hzdr.de/publications/Publ-934

A Combination of Atomic and Continuum Models Describing the Evolution of Nanoclusters

Strobel, M.; Heinig, K.-H.; Möller, W.

Permalink: https://www.hzdr.de/publications/Publ-933

Molecular-Dynamics Studies of a C:H Film Growth by Energetic Hydrocarbon Molecule Impact

Jäger, H.-U.; Weiler, W.

Permalink: https://www.hzdr.de/publications/Publ-931

Novel Rhenium Complexes Derived from ALPHA-Tropanol as Potential Ligands for the Dopamin Transporter

Hoepping, A.; Brust, P.; Berger, R.; Leibnitz, P.; Spies, H.; Machill, S.; Scheller, D.; Johannsen, B.

Permalink: https://www.hzdr.de/publications/Publ-930

Thermodynamic properties of the SU(2)f chiral quark-loop soliton

Schleif, M.; Wünsch, R.

Permalink: https://www.hzdr.de/publications/Publ-929

Comment on Amorphization and Defect Recombination in Ion Implanted Silicon Carbide

Heera, V.

Permalink: https://www.hzdr.de/publications/Publ-928

Microstructure and Tribological Properties of Aluminium Implanted with High Doses of Nickel

Wieser, E.; Grötzschel, R.; Mücklich, A.; Prokert, F.

Permalink: https://www.hzdr.de/publications/Publ-927

A Simple Paper-based Secondary Standard for Energy Dispersive X-Ray Analysis

Neelmeijer, C.; Hüller, J.; Mäder, M.; Borchers, B.; Jarjis, R.

Permalink: https://www.hzdr.de/publications/Publ-926

Nitriding of Austenitic Stainless Steel Using Plasma Immersion Ion Implantation

Mändl, S.; Günzel, R.; Richter, E.; Möller, W.

Permalink: https://www.hzdr.de/publications/Publ-924

Wave mixing at the Hg-HgO interface

Kolevzon, V.; Pozdniakov, G.

  • Other report
    1997 Fall MRS Meeting, Boston December 2-6

Permalink: https://www.hzdr.de/publications/Publ-923

Roughness Improvement and Hardness Enhancement in Nanoscale Al/AlN Multilayered Thin Films

Wang, X.; Kolitsch, A.; Möller, W.

Permalink: https://www.hzdr.de/publications/Publ-922

Synthesis of Rhenium(I) and Technetium(I) Carbonyl/Dithioether Ligand Complexes Bearing 3,17-BETA-Estradiol

Reisgys, M.; Wüst, F.; Alberto, R.; Schibli, R.; Schubiger, P. A.; Pietzsch, H.-J.; Spies, H.; Johannsen, B.

Permalink: https://www.hzdr.de/publications/Publ-921

HPLC-Analysis of the Metabolism of 6-[18F]-Fluoro-L-DOPA (FDOPA) in the Brain of Neonatal Pigs

Vorwieger, G.; Brust, P.; Bergmann, R.; Bauer, R.; Walter, B.; Füchtner, F.; Steinbach, J.; Johannsen, B.

  • Book (Authorship)
    Quantitative Functional Brain Imaging with Positron Emission Tomography, Carson, R. E.; Daube-Witherspoon, M. E.; Herscovich, P.; eds); Academic Press, 285-292
    DOI: 10.1016/B978-012161340-2/50045-7

Permalink: https://www.hzdr.de/publications/Publ-920

Recriticality Calculations for Uraniumdioxide-Water Systems with MCNP

Kumpf, H.

With the aim of generating a certain feeling for the general dependencies of the multiplication factor k∞ the first section provides some results for two classes of deformations of the original fuel pins. The main part examines UO2-structures of increasing disorder, beginning with the hexagonal close package of fuel spheres and ending up with stochastic geometries. Among these structures the worst case, i.e. the one with the highest k∞ but preserving mechanical stability is identified. The composition and geometric parameter of this case is used to calculate the critical thickness of a slab and critical radius of a sphere.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-183, June 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-919

On-Line Isothermal Gas Chromatography with Short-lived Mo- and Tc-Isotopes in the O2H2O(g)/SiO2(s)-System

Vahle, A.

  • Lecture (Conference)
    4. Workshop Chemistry and Physics of the Heaviest Elements, 5.-8.6.1997, Göteborg

Permalink: https://www.hzdr.de/publications/Publ-918

Trace Amount Components in Laminar Gas Flow - Theoretical and Experimental Studies

Grantz, M.

  • Lecture (Conference)
    4. Workshop Chemistry and Physics of the Heaviest Elements, 5.-8.6.1997, Göteborg

Permalink: https://www.hzdr.de/publications/Publ-917

Multimodal impurity redistribution and nanocluster formation in Ge implanted silicon dioxide films

von Borany, J.; Grötzschel, R.; Heinig, K.-H.; Markwitz, A.; Matz, W.; Schmidt, B.; Skorupa, W.

Permalink: https://www.hzdr.de/publications/Publ-916

Thermochromatography of No-259

Taut, S.

  • Lecture (Conference)
    4. Workshop Chemistry and Physics of the Heaviest Elements, 5.-8.6.1997, Göteborg

Permalink: https://www.hzdr.de/publications/Publ-915

Status of the Preparation for Seaborgium Gas Chemistry Experiments with Oxidehydroxides

Hübener, S.

  • Lecture (Conference)
    4. Workshop Chemistry and Physics of the Heaviest Elements, 5.-8-6-1997, Göteborg

Permalink: https://www.hzdr.de/publications/Publ-914

Deposition of tetrahedral hydrogenated amorphous carbon using a novel Elecron Cyclotron Wave Resonance reactor

Weiler, M.; Lang, K.; Li, E.; Robertson, J.

Permalink: https://www.hzdr.de/publications/Publ-911

Direktmessung alpha-aktiver Nuklide - Projektfortschritte

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

  • Lecture (Conference)
    GRS Köln, 12.5.97

Permalink: https://www.hzdr.de/publications/Publ-910

The 4 pi - fragment - spectrometer FOBOS

Ortlepp, H.-G.; Wagner, W.; Herbach, C.-M.; Aleksandrov, A. A.; Aleksandrova, I. A.; Andrassy, M.; Budzanovski, A.; Czech, B.; Danziger, M.; Dietterle, L.; Doronin, V. N.; Dshemuchadse, S.; Fomichev, A. S.; Fromm, W. D.; Gebhardt, M.; Gippner, P.; Heidel, K.; Heinitz, S.; Homeyer, H.; Ivanovsky, S. I.; Kamanin, D. V.; Kolesov, I. V.; Matthies, A.; May, D.; Merzlyakov, S. I.; von Oertzen, W.; Oganessian, Y. T.; Pausch, G.; Penionzhkevich, Y. E.; Pyatkov, Y. V.; Radnev, S. V.; Renz, G.; Rubinskaya, L. A.; Sandrev, I. D.; Schilling, K.-D.; Seidel, W.; Shishkin, D. I.; Sirotin, A. P.; Sodan, H.; Strekalovsky, O. V.; Tishchenko, V. G.; Trofimov, V. V.; Tsurin, I. P.; Umlauf, C.; Vakatov, D. V.; Vasko, V. M.; Vitenko, V. A.; Will, E.; Wilpert, M.; Yanez, R.; Zhuchko, V. E.; Ziem, P.; Zrodlowski, L.

Abstract
The 4 π - fragment - spectrometer FOBOS developed for heavy-ion research at beam energies of 10 - 100 AMeV has been commissioned for physical experiments at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna. Based on the logarithmic detector principle, it is able to register charged fragments from Protons up to heavy residual nuclei in a large dynamical range. Position-sensitive avalanche counters, axial ionization chambers and CsI(TI) scintillation detectors are arranged in three concentric detector shells. An array of phoswich detectors is used as a more granular forward detector at narrow polar angles. The modular concept of FOBOS allows for different experimental application in the field of exclusive fragment spectroscopy at medium multiplicities. For illustration the fragment spectroscopy studies concerning the spontaneous fission process and the fragmentation of hot nuclei by means of the FOBOS set-up are considered.

  • Nuclear Instruments and Methods in Physics Research A 403 (1998) 65-97
  • Open Access Logo Forschungszentrum Rossendorf; FZR-181
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-909

Modification of Silicon Nitride Ceramics with High Intensity Pulsed Ion Beams

Brenscheidt, F.; Piekoszewski, J.; Wieser, E.; Langner, J.; Grötzschel, R.; Reuther, H.

Permalink: https://www.hzdr.de/publications/Publ-907

Institut of Radiochemistry; Annual Report 1996

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

  • Open Access Logo Forschungszentrum Rossendorf; FZR-180
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-906

Ion drift processes in PYREX-type alkali-borosilicate glass during anodic bonding

Nitzsche, P.; Lange, K.; Schmidt, B.; Grigull, S.; Kreißig, U.; Thomas, B.; Herzog, K.

Permalink: https://www.hzdr.de/publications/Publ-905

Windenergiepotential in Sachsen

Hirsch, W.; Rindelhardt, U.

The wind energy ressources of Saxony, a typical interior state of Germany, have been estimated based on a special wind measuring programme. It was performed between 1991 and 1995. The main problem in applying the wind atlas method was to determine the areas with the same wind climate and the corresponding data sets (atlas stations). After defining the atlas stations ressource file calculations were performed over about 60 % of the saxon territory. The technical potential of wind energy in Saxony was estimated to be 5 TWh p.a. First results from saxon WEC`s confirm the results.

  • DEWI-Magazin Nr. 11, August 1997, S. 44 - 49

Permalink: https://www.hzdr.de/publications/Publ-904

Ermittlung bruchmechanischer Kennwerte im instrumentierten Kerbschlagbiegeversuch - Vergleichsuntersuchungen zur Rißdetektion mit Schallemission und dem Laserstreulichtverfahren

Richter, H.; Böhmert, J.; Valo, M.; Viehrig, H.-W.

  • Lecture (Conference)
    Deutscher Verband für Materialforschung und -prüfung, Tagung Werkstoffprüfung 1997, Dezember 1997, Bad Nauheim, Vortragsband, S. 217 ff.
  • Contribution to proceedings
    Deutscher Verband für Materialforschung und -prüfung, Tagung Werkstoffprüfung 1997, Dezember 1997, Bad Nauheim, Vortragsband, S. 217 ff.

Permalink: https://www.hzdr.de/publications/Publ-903

Electron spectroscopy for chemical analysis Investigation of the Interaction of uranyl and calcium ions with humic acids

Nefedov, V. I.; Teterin, Y. A.; Lebedev, A. M.; Teterin, A. Y.; Dementjev, A. P.; Bubner, M.; Reich, T.; Pompe, S.; Heise, K.-H.; Nitsche, H.

Permalink: https://www.hzdr.de/publications/Publ-902

Entwicklungen in der Technetiumchemie für die Nuklearmedizin

Johannsen, B.

  • Nuclear Medizin 33 (1994) A 90 (Abstract)

Permalink: https://www.hzdr.de/publications/Publ-901

Theoretische Untersuchungen zur Fluid-Struktur-Wechselwirkung in zweiphasig durchströmten Schwingungsmodellen

Grunwald, G.

Kurzfassung
Ausgehend von den Grundgleichungen für Kontinuität, Impuls und Energie einer Zweiphasenströmung werden Beziehungen für ein Ersatzfluid des Gas- Flüssigkeits- Gemisches mit orts- und zeitabhängiger Dichte und Geschwindigkeit aufgestellt und anhand eines Siedemodells geprüft. Es folgen Anwendungen auf ein 1D- und ein 2D- Schwingungsmodell (Pendel im Zweiphasenstrom) unter Berücksichtigung der Fluid-Struktur- Wechselwirkung und die Berechnung von Eigenfrequenzen und Dämpfungen.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-178 April 1997
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-900

X-ray spectroscopy on ECR plasmas

Friedlein, R.; Herpich, S.; Lehnert, U.; Tyrroff, H.; Wirth, H.; Zippe, C.; Zschornack, G.

Permalink: https://www.hzdr.de/publications/Publ-899

Energy dispersive X-ray spectroscopy for ECR plasma diagnostics

Friedlein, R.; Küchler, D.; Zippe, C.; Zschornack, G.; Tyrroff, H.

Permalink: https://www.hzdr.de/publications/Publ-898

Experimental study of the hot and warm electron populations in an electron cyclotron resonance argon-oxygen-hydrogen plasma

Friedlein, R.; Herpich, S.; Hiller, H.; Wirth, H.; Zschornack, G.; Tyrroff, H.

Permalink: https://www.hzdr.de/publications/Publ-897

Hot and warm electron energy distribution at different electron cyclotron resonance ion source operation regimes

Friedlein, R.; Tyrroff, H.; Henke, D.; Zippe, C.; Zschornack, G.

Permalink: https://www.hzdr.de/publications/Publ-896

Characteristic x rays and electron energy distribution function in anisotropical hot plasmas

Friedlein, R.; Tyrroff, H.; Zippe, C.; Zschornack, G.; Barnitzke, W.

Permalink: https://www.hzdr.de/publications/Publ-895

Electrical and optical characterisation of double SIMOX structures formed by sequential high energy oxygen implantation into silicon

Hatzopoulos, N.; Panknin, D.; Fukarek, W.; Skorupa, W.; Siapkas, D. I.; Hemment, P. L. F.

Permalink: https://www.hzdr.de/publications/Publ-894

Ion optical system for transport and deceleration of highly charged ions

Henke, D.; Tyrroff, H.

Permalink: https://www.hzdr.de/publications/Publ-893

Ion-beam modification of ISFET membranes for copper ion detection

Hüller, J.; Pham, T.; Vopel, T.; Albrecht, J.

Permalink: https://www.hzdr.de/publications/Publ-892

Role of hydrogen ions in plasma-enhanced chemical vapor deposition of hydrocarbon films, investigated by in situ ellipsometry

von Keudell, A.; Jacob, W.; Fukarek, W.

Permalink: https://www.hzdr.de/publications/Publ-891

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

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

Permalink: https://www.hzdr.de/publications/Publ-890

Ion beam sensitized SiO2 surface for halide ions

Pham, T.; Matz, W.; Möller, W.; Hüller, J.

Permalink: https://www.hzdr.de/publications/Publ-889

Coimplantation of silver and halogens in thin SiO2 films

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

Permalink: https://www.hzdr.de/publications/Publ-888

Room-temperature, sorth-wavelength (400-500 nm) photoluminescence from silicon-implanted silicon dioxide films

Skorupa, W.; Yankov, R. A.; Tyschenko, I. E.; Fröb, H.; Böhme, T.; Leo, K.

Permalink: https://www.hzdr.de/publications/Publ-887

CEMS study on magnetic structure of Fe-Si-Al films implanted with Al and N ions

Nomura, K.; Reuther, H.; Richter, E.; Ujihira, Y.

  • Contribution to proceedings
    ICAME '95, Conference Proceedings Vol. 50, Ed.: I. Ortalli, SIF Bologna, 1996, pp. 703-706

Permalink: https://www.hzdr.de/publications/Publ-886

Investigations of texture formation in geomaterials by neutron diffraction with high pressure chambers

Nikitin, A. N.; Sukhoparov, W. A.; Heinitz, J.; Walther, K.

Permalink: https://www.hzdr.de/publications/Publ-885

Ion beam induced crystallization of 6H-SiC

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

  • Book (Authorship)
    Institute of Physics Conference Series No 142: Chapter 3, pp. 533-536, Silicon Carbide and Related Materials 1995 Conf., Kyoto, Japan, c 1996 IOP Pub.

Permalink: https://www.hzdr.de/publications/Publ-884

High dose co-implantation of aluminium and nitrogen in 6H-silicon carbide

Heera, V.; Pezoldt, J.; Ning, X. J.; Pirouz, P.

  • Book (Authorship)
    Institute of Physics Conference Series No 142: Chapter 3, pp. 509-512, Silicon Carbide and Related Materials 1995 Conf., Kyoto, Japan, c 1996 IOP Pub.

Permalink: https://www.hzdr.de/publications/Publ-882

Smooth termination of intruder bands in 10951Sb

Schnare, H.; La Fosse, D. R.; Hauschild, K.; Janzen, V. P.; Mullins, S. M.; Beausang, C. W.; de Graaf, J.; Lee, I. Y.; Afanasjev, A. V.

Permalink: https://www.hzdr.de/publications/Publ-881

Nutzung genetischer Algorithmen zur Identifikation von Gesteinsschichten

Hoppe, D.; Schneider, S.

  • Lecture (Conference)
    Berg- und Hüttenmännischer Tag, Freiberg, 1997, Tagungsbericht, S. 146-159
  • Contribution to proceedings
    Berg- und Hüttenmännischer Tag, Freiberg, 1997, Tagungsbericht, S. 146-159

Permalink: https://www.hzdr.de/publications/Publ-880

Evidence for Layered Structure of Boron Nitride Films Detected by Rutherford Backscattering

Plass, M.; Fukarek, W.; Kolitsch, A.; Mäder, M.; Möller, W.

  • Physica Status Solidi A 155 (1996) pp. K1-K4

Permalink: https://www.hzdr.de/publications/Publ-879

Ion implantation and annealing effects in silicon carbide

Heera, V.; Skorupa, W.

SiC is a promising semiconductor material for high-power/high-frequency
and high-temperature electronic applications. For selective doping of SiC
ion implantation is the only possible process. However, relatively little
is known about ion implantation and annealing effects in SiC. Compared
to ion implantation into Si there is a number of specific features which
have to be considered for successful ion beam processing of SiC. A brief
review is given on some aspects of ion implantation in and annealing of
SiC. The ion implantation effects in SiC are discussed in direct comparison
to Si. The following issues are addressed: ion ranges, radiation damage,
amorphization, high temperature implantation, ion beam induced crystallization
and surface erosion.

Permalink: https://www.hzdr.de/publications/Publ-877

Quantum-sized silicon precipitates in silicon-implanted and pulse-annealed silicon dioxide films: Photoluminescence and structural transformations

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.

Strong blue, red an near-infrared photoluminescence has
been observed from Si+-implanted and pulse annealed SiO2 layers. Raman
scattering and high-resolution electron microscopy analyses have revealed
a correlation between the structure of the Si inclusions in the SiO2 layers
during pulse and furnace annealing have been discussed in terms of the
changes in the light emission ovserved experimentally. Small Si clusters,
non-crystallineinclusions and nanocrystals are believed to be the light
sources. The blue, red and near-infrared photoluminescence is associated
with small complexes of excess Si atoms, non-crystalline Si nanoinclusters
and quantum-confined Si nanocrystals, respectively.

Permalink: https://www.hzdr.de/publications/Publ-876

Implantation and growth of large Beta-FeSi2 precipitates and Alpha-FeSi2 network structures in silicon

Reuther, H.; Dobler, M.

Permalink: https://www.hzdr.de/publications/Publ-874

Verfahren der Ionenstrahlbearbeitung und ihre Anwendung bei Umformwerkzeugen

Richter, E.

Ionenstrahltechniken können mit Erfolg zur Verbesserung der Standmengen bei Umformwerkzeugen eingesetzt werden. Am Beispiel der Stickstoffionenimplantation konnte gezeigt werden, dass fü die Umformung weicher Materialien bei Press-, Stanz- und Ziehwerkzeugen eine Verläerung der Einsatzdauer bei Produktionswerkzeugen unter industriellen Bedingungen bis zum Faktor 4 erreichbar ist. Vorteilhaft ist eine gezielte Bearbeitung der verschleissgefährdeten Regionen eines Werkzeuges mit Hilfe eines gerichteten Ionenstrahls. Neben der unmittelbaren Implantation bietet die ionenstrahlgestüzte Beschichtung als Kombination von konventioneller PVD-Beschichtung und Ionenimplantation eine Vielzahl technisch interessanter Mölichkeiten auch fü Umformwerkzeuge.

  • Blech Rohre Profile 43 (1996) 4 pp. 191-194

Permalink: https://www.hzdr.de/publications/Publ-873

Formation of buried layers of (SiC)1-x(AlN)x in 6H-SiC using ion-beam synthesis

Yankov, R. A.; Hatzopoulos, N.; Fukarek, W.; Voelskow, M.; Heera, V.; Pezoldt, J.; Skorupa, W.

Solid solutions of SiC and III-V compound semiconductors
are recognized as promising materials for novel semiconductor applications.
This paper reports on experiments which explore the possibility of synthesizing
thin buried layers of (SiC)1-x(AlN)x having composition of about x = 0.2
by co-implanting N+ and Al+ ions into 6H-SiC-wafers maintained at temperatures
in the range 200 - 800 C. Structural and compositional evaluation of as-implanted
samples was carried out using a combination of Rutherford backscattering/channelling
spectrometry and infrared reflectance spectroscopy. It is shown that the
structures are highly sensitive to the substrate temperature. The use of
sufficiently high temperatures (400 - 800 C) enables the crystallinity
of the host material as well as relatively low damage levels to be maintained
during implantation. The formation of Al-N bonds within the implanted layers
is also confirmed over the temperature range studied.

  • Contribution to proceedings
    Materials Research Society symposium proceeding 438 (1997) pp. 271-276, MRS
    DOI: 10.1557/PROC-438-271

Permalink: https://www.hzdr.de/publications/Publ-872

Institute of Ion Beam Physics and Materials Research; Annual Report 1996

von Borany, J.; Jäger, H.-U.; Möller, W.; Wieser, E.

  • Open Access Logo Forschungszentrum Rossendorf; FZR-166
    ISSN: 1436-3976

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Permalink: https://www.hzdr.de/publications/Publ-871

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