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    <title>Results for Versions - 3030640</title>
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    <item>
      <title>Verwirbelungen und Vortrieb</title>
      <pubDate>Fri, 01 Jan 1999 15:17:14 +0100</pubDate>
      <link>https://www.sponet.de/sponet/Record/4012896</link>
      <guid>https://www.sponet.de/sponet/Record/4012896</guid>
      <author>Arellano, R.</author>
      <dc:format>Artikel</dc:format>
      <dc:format>Kongressband, Tagungsbericht</dc:format>
      <dc:subject>Schwimmen</dc:subject>
      <dc:subject>Biomechanik</dc:subject>
      <dc:subject>Vortrieb</dc:subject>
      <dc:subject>Visualisierung</dc:subject>
      <dc:format>Artikel</dc:format>
      <dc:format>Kongressband, Tagungsbericht</dc:format>
      <dc:creator>Arellano, R.</dc:creator>
      <content:encoded><![CDATA[A review of the general theory of swimming propulsion is presented relating this with knowledge about vortices in steady and unsteady flow conditions. Three methods of flow visualisation have been used in the experiments: a) injecting air bubbles close to big toe during undulatory underwater swimming and breaststroke kick; b) putting reflective particles in water to see hand short movements and; c) injection of air bubbles in the swimming pool creating a "bubble wall", making it possible for the swimmer to cross and to swim along it. The results of the experiments showed that: a) vortices are generated during different phases of the stroke and during the downward kick in undulatory swimming, flutter kick and breaststroke kick; b) when the hand suddenly changes the direction of its movement the starting vortex is detached from the hand and; c) the size and movement characteristics of the vortex seem related to propulsion obtained by the hand and foot movements.]]></content:encoded>
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    <item>
      <title>Verwirbelungen und Vortrieb</title>
      <pubDate>Fri, 01 Jan 1999 15:17:14 +0100</pubDate>
      <link>https://www.sponet.de/sponet/Record/4003735</link>
      <guid>https://www.sponet.de/sponet/Record/4003735</guid>
      <author>Arellano, R.</author>
      <dc:format>elektronische Publikation</dc:format>
      <dc:subject>Schwimmen</dc:subject>
      <dc:subject>Hydrodynamik</dc:subject>
      <dc:subject>Vortrieb</dc:subject>
      <dc:subject>Biomechanik</dc:subject>
      <dc:format>elektronische Publikation</dc:format>
      <dc:creator>Arellano, R.</dc:creator>
      <content:encoded><![CDATA[A review of the general theory of swimming propulsion is presented relating this with knowledge about vortices in steady and unsteady flow conditions. Three methods of flow visualisation have been used in the experiments: a) injecting air bubbles close to big toe during undulatory underwater swimming and breaststroke kick; b) putting reflective particles in water to see hand short movements and; c) injection of air bubbles in the swimming pool creating a 'bubble wall', making it possible for the swimmer to cross and to swim along it. The results of the experiments showed that: a) vortices are generated during different phases of the stroke and during the downward kick in undulatory swimming, flutter kick and breaststroke kick; b) when the hand suddenly changes the direction of its movement the starting vortex is detached from the hand and; c) the size and movement characteristics of the vortex seem related to propulsion obtained by the hand and foot movements.
(Introduction: The Basics of Swimming Propulsion, What is a Vortex? Flow Visualisation Techniques)]]></content:encoded>
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    <item>
      <title>Wirbel und Vortrieb</title>
      <pubDate>Fri, 01 Jan 1999 15:17:14 +0100</pubDate>
      <link>https://www.sponet.de/sponet/Record/3030640</link>
      <guid>https://www.sponet.de/sponet/Record/3030640</guid>
      <author>Arellano, R.</author>
      <dc:format>Buch</dc:format>
      <dc:subject>Schwimmen</dc:subject>
      <dc:subject>Biomechanik</dc:subject>
      <dc:subject>Vortrieb</dc:subject>
      <dc:subject>Hydrodynamik</dc:subject>
      <dc:format>Buch</dc:format>
      <dc:creator>Arellano, R.</dc:creator>
      <content:encoded><![CDATA[Es wird ein Überblick über die allgemeine Theorie des Vortriebs beim Schwimmen gegeben und dies mit dem Wissen über Wirbel in ruhendem und bewegtem Wasser in Verbindung gesetzt. In den Experimenten wurden drei Methoden der Flies-Visualisierung angewendet:
a) die Injektion von Luftblasen nahe des großen Zehs beim wellenförmigen Unterwasserschwimmen und Brustbeinschlag,
b) Zugabe von Reflektionspartikeln ins Wasser zur Sichtbarmachung der Handbewegung und
c) die Injektion von Luftblasen in das Schwimmbecken und damit Schaffung einer "Blasen-Wand", die der Schwimmer queren oder an der er entlangschwimmen kann.
Ergebnisse:
Die Ergebnisse der Experiment zeigten:
1. Wirbel werden während verschiedener Phasen des Zugs und beim Abwärtsbeinschlag beim wellenförmigen Schwimmen erzeugt. 
2. Beim plötzlichen Richtungswechsel der Hand wird der Ausgangswirbel von der Hand gelöst.
3. Größe und Bewegungsmerkmale der Wirbel scheinen in Zusammenhang zu stehen mit dem durch die Hand- und Fußbewegungen erzeugten Vortrieb.]]></content:encoded>
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