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    <completedYear/>
    <publishedYear>2009</publishedYear>
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    <language>eng</language>
    <pageFirst>129</pageFirst>
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    <pageNumber>6</pageNumber>
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    <title language="eng">Acoustic Radiation Problem of a Recorder Fluid</title>
    <parentTitle language="eng">Proceedings of the 9th International Conference on Theoretical and Computational Acoustics, Dresden</parentTitle>
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    <author>Stefanie Retka</author>
    <author>Stuart C. Hawkings</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2878</id>
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    <publishedYear>2009</publishedYear>
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    <language>eng</language>
    <pageFirst>228</pageFirst>
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    <pageNumber>2</pageNumber>
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    <title language="eng">Modal Analysis of a Fluid inside and around a Recorder</title>
    <parentTitle language="eng">Proceedings of NAG/DAGA 2009, International Conference on Acoustics, Rotterdam</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
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  <doc>
    <id>2879</id>
    <completedYear/>
    <publishedYear>2008</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>79</pageFirst>
    <pageLast>80</pageLast>
    <pageNumber>2</pageNumber>
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    <title language="deu">Vergleich der akustischen Finite-Elemente-Lösungen zu Eigenwertproblem und Quellproblem mit Raviart-Thomas- sowie Lagrange-Elementen</title>
    <parentTitle language="deu">Fortschritte in der Akustik – Plenarvorträge und Fachbeiträge der 34. Jahrestagung für Akustik, Dresden</parentTitle>
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    <author>Stefanie Retka</author>
    <author>Luis Hervella-Nieto</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2862</id>
    <completedYear/>
    <publishedYear>2013</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1197</pageFirst>
    <pageLast>1198</pageLast>
    <pageNumber>2</pageNumber>
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    <title language="eng">Open Bottles - Helmholtz resonator and quarter wave effect</title>
    <parentTitle language="eng">AIA-DAGA – Proceedings of the International Conference on Acoustics, Meran</parentTitle>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
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  <doc>
    <id>2865</id>
    <completedYear/>
    <publishedYear>2012</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <pageLast/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">Modal analysis of a fluid in an unbounded domain with finite and infinite elements</title>
    <parentTitle language="eng">Proceedings of NOVEM 2012 – Noise and Vibration: Emerging Methods, Sorrento</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
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  <doc>
    <id>2866</id>
    <completedYear/>
    <publishedYear>2012</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>557</pageFirst>
    <pageLast>558</pageLast>
    <pageNumber>2</pageNumber>
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    <completedDate>--</completedDate>
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    <title language="deu">Modalanalyse eines strömenden Fluids mit finiten und infiniten Elementen</title>
    <parentTitle language="deu">Fortschritte in der Akustik – Plenarvorträge und Fachbeiträge der 38. Jahrestagung für Akustik, Darmstadt</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2867</id>
    <completedYear/>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>145</pageFirst>
    <pageLast>147</pageLast>
    <pageNumber>3</pageNumber>
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    <issue/>
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    <contributingCorporation>DAS – Danish Acoustical Society</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">Numerical computations of a fluid inside and around a recorder</title>
    <abstract language="eng">We present the sound propagation and sound radiation inside and around a three dimensional recorder model. The fluid inside and in the near field of the instrument is meshed by second order Lagrangian tetrahedra elements. To present the effects in the far field, infinite elements are added to the finite elements. As infinte elements we use complex conjugated Astley-Leis elements. The goal of our studies is the computation of the eigenmodes of all playable notes, as well as the determination of the radiation behaviour for different fingerings. In a first step, the results obtained by considering a static fluid are presented. When playing a recorder, the inserted air flow leads to an oscillation of the air column inside the instrument. The musician is able to influence the frequency of the note by varying the blowing pressure and therefore a fine-tuning of the sound can be achieved. In rotation afflicted flows, the sound propagation can be described by the Galbrun equation. In a first instance, we present the influence of the flow velocity on the eigenfrequencies for simple geometries. Those results are compared to the frequencies obtained with Helmholtz equation for static fluids.</abstract>
    <parentTitle language="eng">Proceedings of Forum Acusticum 2011, Aalborg, Dänemark</parentTitle>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2868</id>
    <completedYear/>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>42</pageFirst>
    <pageLast>49</pageLast>
    <pageNumber>8</pageNumber>
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    <completedDate>--</completedDate>
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    <title language="eng">Simulation and Experiment for Intonation of a Recorder</title>
    <parentTitle language="eng">Analysis and description of music instruments using engineering methods,&#13;
Halle</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Steffen Marburg</author>
    <author>Stefanie Retka</author>
    <author>Franziska Möbius</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2870</id>
    <completedYear/>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>819</pageFirst>
    <pageLast>820</pageLast>
    <pageNumber>2</pageNumber>
    <edition/>
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    <volume/>
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    <publisherName/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Numerische Berechnung eines Fluids innerhalb und um einer Blockflöte</title>
    <parentTitle language="deu">Fortschritte in der Akustik – Plenarvorträge und Fachbeiträge der 37. Jahrestagung für Akustik, Düsseldorf</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
  <doc>
    <id>2871</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>3</pageNumber>
    <edition/>
    <issue/>
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    <type>conferenceobject</type>
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    <creatingCorporation/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Numerical Modal Analysis of a Recorder Fluid</title>
    <parentTitle language="eng">Proceedings of 20th International Symposium on Music Acoustics (Associated Meeting of the International Congress on Acoustics), ISMA 2010, Sydney and Katoomba</parentTitle>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Stefanie Retka</author>
    <author>Steffen Marburg</author>
    <collection role="Autoren" number="retka">Stefanie Retka</collection>
  </doc>
</export-example>
