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Titre :
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Dynamic x-ray optics with microfluidics: stabilization of gas bubbles by surface ordering and freezing
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Titre original :
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Optique dynamique RX avec des microfluides: stabilisation des bulles de gaz par arrangement et réfrigération de surface
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Auteurs :
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Yasutaka Iwashita, Auteur ;
Christian Bahr, Auteur ;
Craig Priest, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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La Houille blanche (N° 6, 2009)
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Article en page(s) :
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pp. 129-134
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Note générale :
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Hydraulique
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Langues :
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Anglais
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Index. décimale :
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551.4 (surface du globe.Géographie physique.Géomorphologie)
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Tags :
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Microfluidique Bulles Gaz
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Résumé :
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Compound refractive lenses (CRL), which are composed of many lenses aligned along the optical axis, have been developed as refractive x-ray optics. A CRL has numerous desired properties: It is robust, easy to align and to operate, and can be used for hard x-rays. To broaden the possibilities and functions of static CRL, we propose a "dynamic CRL", which is composed of continuously renewed gas bubbles in a surrounding liquid phase flowing along a thin capillary. Due to the continuous renewal, this system is expected to have a high stability against high x-ray intensities. Furthermore, the variation of the bubble volume and bubble shape by adjusting the flow parameters allows in-situ optimization of the optical properties of the system, i.e. the focal length. Here, we study the usage of liquid crystals and n-alkanes to be used in dynamic CRL's. These liquids have a very low x-ray absorption and the liquid - gas systems can be stabilized without surfactants using the surface ordering of liquid crystals respectively the surface freezing of n-alkanes.
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DEWEY :
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553.7
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ISSN :
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0018-6368
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En ligne :
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http://www.shf-lhb.org/index.php?option=article&access=standard&Itemid=129&url=/articles/lhb/abs/2009/06/lhb2009090/lhb2009090.html
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