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    <title language="eng">Data selection strategies for minimizing measurement time in materials characterization</title>
    <abstract language="eng">Every new material needs to be assessed and qualified for an envisaged application. A steadily increasing number of new alloys, designed to address challenges in terms of reliability and sustainability, poses significant demands on well-known analysis methods in terms of their efficiency, e.g., in X-ray diffraction analysis. Particularly in laboratory measurements, where the intensities in diffraction experiments tend to be low, a possibility to adapt the exposure time to the prevailing boundary conditions, i.e., the investigated microstructure, is seen to be a very effective approach. The counting time is decisive for, e.g., complex texture, phase, and residual stress measurements. Traditionally, more measurement points and, thus, longer data collection times lead to more accurate information. Here, too short counting times result in poor signal-to-background ratios and dominant signal noise, respectively, rendering subsequent evaluation more difficult or even impossible. Then, it is necessary to repeat experiments with adjusted, usually significantly longer counting time. To prevent redundant measurements, it is state-of-the-art to always consider the entire measurement range, regardless of whether the investigated points are relevant and contribute to the subsequent materials characterization, respectively. Obviously, this kind of approach is extremely time-consuming and, eventually, not efficient. The present study highlights that specific selection strategies, taking into account the prevailing microstructure of the alloy in focus, can decrease counting times in X-ray energy dispersive diffraction experiments without any detrimental effect on data quality for the subsequent analysis. All relevant data, including the code, are carefully assessed and will be the basis for a widely adapted strategy enabling efficient measurements not only in lab environments but also in large-scale facilities.</abstract>
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    <author>Alexander Liehr</author>
    <author>Kristina Dingel</author>
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    <author>Sebastian Degener</author>
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    <publisherName>Ernst</publisherName>
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    <title language="deu">Numerische Ermittlung von Baugrundschwingungen bei dynamisch belasteten Fundamenten: Empfehlungen zur Modellierung</title>
    <title language="eng">Numerical analysis of soil vibrations due to vibrating foundations: Guidance for model design</title>
    <abstract language="deu">AbstractIn der Praxis tätige geotechnisch Planende kommen in zunehmendem Maße mit dynamischen Fragestellungen in Berührung. Hersteller von geotechnischer Berechnungssoftware haben entsprechend ihre ursprünglich für statische Aufgabenstellungen konzipierten Produkte um die Möglichkeit zur Lösung von Wellenausbreitungsproblemen im Baugrund erweitert. Den Anwendern fehlt aber häufig die notwendige Erfahrung zur Durchführung dieser Art von numerischen Berechnungen. Die Arbeitskreise 1.4 „Baugrunddynamik“ und 1.6 „Numerik in der Geotechnik“ der Deutschen Gesellschaft für Geotechnik (DGGT) haben diese Entwicklung aufgegriffen und einen gemeinsamen Unterarbeitskreis „Numerik in der Baugrunddynamik“ gegründet. Der vorliegende Beitrag stellt die aktuellen Ergebnisse der Arbeit des Unterarbeitskreises vor und fasst die gewonnenen Erkenntnisse in Form von Empfehlungen zusammen.</abstract>
    <abstract language="eng">Geotechnical engineers are increasingly concerned with wave propagation problems. Manufacturers of geotechnical analysis software added features for soil dynamic analyses to their products initially devised for static geotechnical analyses. Though, users often lack the experience for conducting such advanced numerical analyses. Working groups 1.4 "Soil dynamics" and 1.6 "Numerical analyses in geotechnical engineering" of DGGT German Society for Geotechnical Engineering established a joint subgroup "Numerical analyses in soil dynamics" to address this shortcoming. The present paper presents the work of the subgroup so far and provides some guidance on conducting numerical analyses in soil dynamics.</abstract>
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    <author>Winfried Schepers</author>
    <author>Ronald B. J. Brinkgreve</author>
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    <author>Dirk Wegener</author>
    <author>Silke Appel</author>
    <author>Georgia Efthymiou</author>
    <author>Wolfgang Krajewski</author>
    <author>Jan Machaček</author>
    <author>Thomas Meier</author>
    <author>Bashar Nseir</author>
    <author>Peter Rangelow</author>
    <author>Jürgen Schmitt</author>
    <author>Patrick Staubach</author>
    <author>Christos Vrettos</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Wellenausbreitung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Numerische Methoden</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Empfehlungen</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Modellgröße</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Zeitschrittweite</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="themenfelder" number="">Infrastruktur</collection>
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    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
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  <doc>
    <id>1361</id>
    <completedYear/>
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    <language>eng</language>
    <pageFirst>98</pageFirst>
    <pageLast>100</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>43</volume>
    <type>article</type>
    <publisherName>Japan Institute of Metals</publisherName>
    <publisherPlace>Sendai</publisherPlace>
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    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
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    <title language="eng">Measurement of oxygen and nitrogen in high purity metals used as national standards for elemental analysis in Germany by classical carrier gas hot extraction (HE) and HE after activation with photons</title>
    <abstract language="eng">The special importance of the analysis of non-metals in high purity metals, which will serve as national standards for elemental analysis in Germany, is illustrated for oxygen and nitrogen. The typical range of the mass fraction of oxygen and nitrogen in these materials is below 10.MU.g/g, often close to 1.MU.g/g. The two methods applied at BAM for these measurements are classical carrier gas hot extraction (HE) and carrier gas hot extraction after activation with photons (PAA-HE). The approach, the methods and their advantages and limitations are discussed. Comparative results from the measurement of oxygen and nitrogen in Cu, Fe, Ga, Pb, Sn and W are presented. (author abst.)</abstract>
    <parentTitle language="eng">Materials transactions</parentTitle>
    <identifier type="old">1155</identifier>
    <identifier type="doi">10.2320/matertrans.43.98</identifier>
    <identifier type="issn">1345-9678</identifier>
    <identifier type="issn">1347-5320</identifier>
    <enrichment key="bibliotheksstandort">Sonderstandort: Publica-Schrank</enrichment>
    <enrichment key="eventName">8th International Conference on Ultra-High Purity Base Metals (UHPM-2001)</enrichment>
    <enrichment key="eventPlace">Berlin, Germany</enrichment>
    <enrichment key="eventStart">2001-06-25</enrichment>
    <enrichment key="eventEnd">2001-06-28</enrichment>
    <enrichment key="date_peer_review">25.02.2003</enrichment>
    <author>Heinrich Kipphardt</author>
    <author>Thomas Dudzus</author>
    <author>Klaus Meier</author>
    <author>Sebastian Recknagel</author>
    <author>Martina Hedrich</author>
    <author>Ralf Matschat</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Oxygen determination</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Nitrogen determination</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High purity metals</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Carrier gas hot extraction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Photon activation analysis</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")</collection>
  </doc>
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