TY - GEN A1 - Tamberg, D. A1 - Thiele, D. A1 - Brodda, B. G. A1 - Lammertz, H. A1 - Coerdt, W. A1 - Mainka, E. A1 - Görgenyi, T. A1 - Stütz, A. A1 - Aigner, H. A1 - Deron, S. A1 - Kuhn, E. T1 - Evaluation of an interlaboratory comparison of the chemical assay of U, Th oxide coated particles PY - 1981 SN - 92-0-179081-3 N1 - Serientitel: IAEA safeguards – Series title: IAEA safeguards IS - 3 SP - 1 EP - 38 PB - IAEA CY - Wien AN - OPUS4-33362 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kelm, Jürgen A1 - Kühn, H. A1 - Klein, M. A1 - Wiesmath, A. A1 - Demco, D.E. A1 - Blümich, B. A1 - Gold, P.W. T1 - The NMR-MOUSE: quality control of elastomers KW - NMR-MOUSE KW - Double-quantum NMR KW - Quality control KW - Elastomers PY - 2001 SN - 1090-7807 SN - 0022-2364 VL - 19 SP - 497 EP - 499 PB - Elsevier CY - San Diego, Calif. AN - OPUS4-1034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Darlatt, Erik A1 - Traulsen, C.H.-H. A1 - Poppenberg, J. A1 - Richter, S. A1 - Kühn, Julius A1 - Schalley, C.A. A1 - Unger, Wolfgang T1 - Evidence of click and coordination reactions on a self-assembled monolayer by synchrotron radiation based XPS and NEXAFS N2 - An ethynylterpyridine was 'clicked' to an azide-terminated self-assembled monolayer on gold and characterized by synchrotron radiation based surface analysis as NEXAFS and XPS. The detection of azide and terpyridine signatures confirmed a partial click reaction at room temperature. The absence of the azides after reaction at 50 °C indicates an almost complete conversion. For the latter case successful Pd(II) coordination has been proven. The Au–S interface of the SAMs has been characterized by S 1s and S 2p XPS. KW - Synchrotron radiation XPS KW - NEXAFS spectroscopy KW - Surface click chemistry KW - Self-assembled monolayer KW - HAXPES KW - XANES PY - 2012 DO - https://doi.org/10.1016/j.elspec.2012.02.004 SN - 0368-2048 SN - 1873-2526 VL - 185 IS - 3-4 SP - 85 EP - 89 PB - Elsevier CY - Amsterdam AN - OPUS4-25596 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Markötter, H. A1 - Manke, I. A1 - Kuhn, R. A1 - Arlt, Tobias A1 - Kardjilov, N. A1 - Hentschel, Manfred P. A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hartnig, C. A1 - Scholta, J. A1 - Banhart, J. T1 - Neutron tomographic investigations of water distributions in polymer electrolyte membrane fuel cell stacks N2 - Neutron tomography was applied to study the 3D water distribution in full polymer electrolyte membrane fuel cell (PEMFC) stacks. The water distribution after switch-off of the fuel cell was analyzed over a period of 36 h. We found a slowly increasing water amount in the fuel cell, but only few changes within a time period of 5 h, which is about the time necessary for neutron tomography. In this way, the requirement for successful tomography was obtained. It is demonstrated how the quasi in-situ tomography technique enables us to study the water content in individual flow field channels of three-fold stacks. Flow field as well as stack design issues are addressed by this visualization method showing weak points due to a non-uniform water distribution that can be identified by means of neutron imaging. KW - Radiography KW - Tomography KW - Neutron imaging KW - Polymer electrolyte membrane fuel cell (PEMFC) KW - Manifold stack KW - Water management PY - 2012 DO - https://doi.org/10.1016/j.jpowsour.2012.07.043 SN - 0378-7753 VL - 219 SP - 120 EP - 125 PB - Elsevier CY - Amsterdam [u.a.] AN - OPUS4-26317 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Aegerter, J. A1 - Kühn, Hans-Joachim A1 - Frenz, H. A1 - Weißmüller, C. T1 - EN ISO 6892-1:2009 - Tensile testing: initial experience from the practical implementation of the new standard N2 - With the publication of EN ISO 6892-1:2009, the harmonisation of tensile testing at room temperature in Europe was achieved by combining EN 10002-1:2001 with ISO 6892:1998. Essential changes are the introduction of the strain rate and the strain rate control as the significant testing rate or control mode, respectively, referred to as “Method A”. By using this method in the correct way it is guaranteed that in the moment of determination of properties comparable resulting strain rates at the test piece in smaller ranges of specified strain rates are adopted — also if different stiffnesses of the testing equipment are present. This leads especially for strain rate sensitive materials to better comparable results. In this paper it is documented the need for the implementation of method A, methods for the realisation — also by the use of older testing systems — and an example of the comparability of results of the methods for a strain-rate-sensitive-steel. KW - Zugversuch KW - Dehngeschwindigkeit KW - Steifigkeit PY - 2011 SN - 0025-5300 VL - 53 IS - 10 SP - 595 EP - 603 PB - Hanser CY - München AN - OPUS4-25005 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Aegerter, J. A1 - Kühn, Hans-Joachim A1 - Frenz, H. A1 - Weißmüller, C. T1 - DIN EN ISO 6892-1:2009 - Der Zugversuch - Erste Erfahrungen aus der praktischen Umsetzung der neuen Norm N2 - Mit der Veröffentlichung der DIN EN ISO 6892-1:2009 wurde für den Zugversuch bei Raumtemperatur eine Harmonisierung der in Europa verbindlichen EN 10002-1:2001 mit der ISO 6892:1998 erreicht. Wesentliche Änderungen sind die Einführung der Dehngeschwindigkeit und der Dehngeschwindigkeitsregelung als maßgebliche Prüfgeschwindigkeit bzw. Regelungsart, als Verfahren A bezeichnet. Mit der korrekten Anwendung dieses Verfahrens wird gewährleistet, dass im Moment der Kennwerteermittlung bei enger spezifizierten zulässigen Dehngeschwindigkeitsbereichen vergleichbare resultierende Dehngeschwindigkeiten an der Probe auch bei unterschiedlichen Steifigkeiten der Prüfaufbauten vorliegen. Dieses führt besonders bei dehngeschwindigkeitssensitiven Werkstoffen zu deutlich vergleichbareren Ergebnissen. In diesem Beitrag wird auf die Notwendigkeit der Einführung des Verfahrens A, der möglichen Umsetzungen auch bei Verwendung von älteren Prüfsystemen sowie exemplarisch auf vergleichende Ergebnisse der Verfahren an einem dehngeschwindigkeitssensitivem Stahlwerkstoff eingegangen. KW - Zugversuch KW - Dehngeschwindigkeit KW - Steifigkeit PY - 2011 SN - 0025-5300 VL - 53 IS - 10 SP - 586 EP - 594 PB - Hanser CY - München AN - OPUS4-25006 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bloching, H. A1 - Aegerter, J. A1 - Kühn, Hans-Joachim ED - Grellmann, W. T1 - DIN EN ISO 6892-2: Wesentliche Änderungen in der Norm zum Warmzugversuch N2 - Die im Mai 2011 veröffentlichte Internationale Norm ISO 6892-2 "Metallische Werkstoffe — Zugversuch - Teil 2: Prüfverfahren bei erhöhter Temperatur" ersetzt die Europäische Norm EN 10002-5 und die Internationale Norm ISO 783. Technische Änderungen/Ergänzungen im Vergleich zu den Vorgängernormen beziehen sich im Wesentlichen auf die Prüfgeschwindigkeiten und die Dehnungsmessung. In Anlehnung an Teil 1 der ISO 6892 (Prüfung bei Raumtemperatur) wird die Dehngeschwindigkeit als maßgebliche Prüfgeschwindigkeit mit eingeengten Bereichen (Verfahren A) empfohlen. Zum Ansetzen des Dehnungsaufnehmers und zur Festlegung der Messlänge sind nun verschiedene Verfahren möglich. In dem Beitrag wird auch anhand von Beispielen auf mögliche Auswirkungen auf die zu bestimmenden Kennwerte eingegangen. T2 - DVM-Tagung Werkstoffprüfung 2011 - Neue Entwicklungen in der Werkstoffprüfung - Herausforderungen an die Kennwertermittlung CY - Berlin, Germany DA - 01.12.2011 KW - Warmzugversuch KW - Thermische Ausdehnung KW - Messlänge KW - Dehngeschwindigkeit PY - 2011 SN - 978-3-9814516-1-0 SN - 1861-8154 N1 - Serientitel: DVM-Bericht – Series title: DVM-Bericht IS - 643 SP - 245 EP - 252 AN - OPUS4-25007 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Darlatt, Erik A1 - Nefedov, A. A1 - Traulsen, C.H.-H. A1 - Poppenberg, J. A1 - Richter, S. A1 - Dietrich, Paul A1 - Lippitz, Andreas A1 - Illgen, René A1 - Kühn, Julius A1 - Schalley, C.A. A1 - Wöll, Ch. A1 - Unger, Wolfgang T1 - Interperetation of experimental N K NEXAFS of azide, 1,2,3-triazole and terpyridyl groups by DFT spectrum simulations N2 - Experimental N K-edge NEXAFS data of surface immobilized azide, 1,2,3-triazole and terpyridyl groups are interpreted with the help of DFT spectrum simulations. Assignments of π* resonances in experimental N K-edge NEXAFS spectra to nitrogen atoms within these functional groups have been made. The azide was immobilized on gold as the head group of a thiol SAM, 1,2,3-triazole was formed on this SAM by click reaction and terpyridyl groups were introduced as substituents of the acetylene used for the click reaction. For azide-terminated molecules, DFT spectrum simulations are found to be useful to find measurement conditions delivering experimental N K-edge NEXAFS data with negligible X-ray damage. The 1,2,3-triazole group is found to be rather stable under X-ray irradiation. KW - N K-edge NEXAFS KW - XANES KW - Surface click chemistry KW - Density functional theory KW - Azide KW - 1,2,3-Triazole PY - 2012 DO - https://doi.org/10.1016/j.elspec.2012.09.008 SN - 0368-2048 SN - 1873-2526 VL - 185 IS - 12 SP - 621 EP - 624 PB - Elsevier CY - Amsterdam AN - OPUS4-27774 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Röhl-Kuhn, Barbara A1 - Klobes, Peter A1 - Meyer, Klaus A1 - Lorenz, Peter A1 - Lamberty, A. A1 - Gawlik, B. A1 - Muntau, H. T1 - Certification of the specific micropore volume and the median width of two microporous reference materials according to Draft-DIN 66135-4 KW - Poröse Materialien KW - ZRM-Entwicklung KW - Gasadsorption KW - Mikroporenbestimmung PY - 2004 UR - https://ec.europa.eu/jrc/sites/default/files/rm/BCR-704_report.pdf SN - 1018-5593 IS - 21065 SP - I-III, 5-38 PB - Office for Official Publications of the European Communities CY - Luxembourg AN - OPUS4-5195 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hähner, P. A1 - Rinaldi, C. A1 - Bicego, V. A1 - Affeldt, E. E. A1 - Brendel, T. A1 - Andersson, H. A1 - Beck, T. A1 - Klingelhöffer, Hellmuth A1 - Kühn, Hans-Joachim A1 - Köster, A. A1 - Loveday, M. A1 - Marchionni, M. A1 - Rae, C. T1 - Research and development into a European code-of-practice for strain-controlled thermo-mechanical fatigue testing N2 - Thermo-mechanical fatigue (TMF) testing plays an increasingly important role in the design, the reliability assessment and the lifecycle management of safety critical components used, for instance, for power generation, in the process industry and in aeronautical and automotive applications, with a view to increasing the fuel efficiency, safety and service intervals, while reducing production (and material) costs. In a European Commission funded research project (acronym: TMF-Standard) of the 5th Framework Programme, 20 European laboratories have undertaken a joint research effort to establish a validated code-of-practice (CoP) for strain-controlled TMF testing. Starting from a survey of the testing protocols and procedures previously used by the partners, a comprehensive pre-normative research activity into various issues has been completed, addressing the dynamic temperature control, the effects of deviations in nominal temperatures and phase angles, the influences of temperature gradients, as well as the practicalities of test interruption and restart procedures. Meaningful allowable tolerances for the various test parameters were identified and practical recommendations as to the test techniques were formulated. From this a preliminary CoP was compiled and used to guide an extensive round robin exercise among the project partners. From the statistical analysis of that exercise, a validated CoP was derived dealing with strain-controlled constant amplitude TMF of nominally homogeneous metallic materials subjected to spatially uniform temperature fields and uniaxial mechanical loading. It is intended to give advice and guidance on the appropriate test setup, testing procedures and the analysis of results, in particular for newcomers in the field of strain-controlled TMF. This paper highlights some of the results of the TMF-Standard project. Moreover, commonalities and differences of the present CoP with respect to the standard documents for strain-controlled TMF, which have been developed at ISO and ASTM levels, are presented in this paper. KW - Thermo-mechanical fatigue KW - Ni-base superalloy KW - Standardisation KW - Test methods PY - 2008 DO - https://doi.org/10.1016/j.ijfatigue.2007.01.052 SN - 0142-1123 VL - 30 IS - 2 SP - 372 EP - 381 PB - Elsevier CY - Oxford AN - OPUS4-17536 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -