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136 results on '"Takei, Atsushi"'

7. Capillary Torque

Author

Takei, Atsushi, Fujita, Hiroyuki, Series editor, Liepmann, Dorian, Series editor, and Lambert, Pierre, editor

Published
2013
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15. Angle-tunable liquid wedge prism driven by electrowetting

Author

Takei, Atsushi, Iwase, Eiji, Hoshino, Kazunori, Matsumoto, Kiyoshi, and Shimoyama, Isao

Subjects
Electrostatic apparatus and appliances -- Design and construction, Microelectromechanical systems -- Research, Integrated circuit fabrication -- Methods, Integrated circuit fabrication, Engineering and manufacturing industries, Science and technology
Abstract

We developed a tunable wedge prism by electrowetting actuation. Our prism can shift the field of view to the left or to the right and is useful for small cameras and endoscopes because its field of view can be changed without the need for large instruments. It consists of two plates that face each other, and a liquid is sandwiched between them. The liquid and plates form a wedge when the angle between the plates is changed. We used electrowetting to change the angle between the plates. The wedge prism is small because the liquid driven by electrowetting works as a prism. In addition, the prism produces a clear field of view because its optical flatness is determined by the flatness of the plates. [2007-0079] Index Terms--Electrostatic devices, microelectromechanical devices, optical device fabrication.

Published
2007

29. Low voltage operation of organic thin-film transistor with atmospheric coating of high-kpolymer dielectric

Author

Kuribara, Kazunori, Takei, Atsushi, Sato, Takashi, and Yoshida, Manabu

Abstract

We investigated high-kpolymers as gate dielectrics to develop an atmospheric-pressure process for organic transistors. A high-kterpolymer, p(VDF-TrFE-CFE), was formed by drop-casting. Self-assembled molecules (SAM) of triptycene derivatives have been utilized as surface modifiers for high-kgate dielectrics to improve the transistor characteristics. High-kterpolymers reduce the operating voltage of organic thin-film transistors (TFTs) by up to 2.5 V to their high capacities. Introducing a SAM onto the gate dielectric surface improved the organic TFTs’ mobility by more than three orders of magnitude. In addition, a terpolymer and a SAM can be formed simultaneously by drop-casting. This atmospheric processing of the gate dielectric is expected to contribute to organic electronics in large-area or mass production, such as roll-to-roll processes.

Published
2024
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38. Dechirures anisotropes : Propagation de fissure dans des plaques anisotropes

Author

Roman, Benoit, Bico, José, TAKEI, Atsushi, HAMM, Luis, Melo, Francisco, Service irevues, irevues, and Association Française de Mécanique

Subjects
Rupture, Anisotropie, [PHYS.MECA]Physics [physics]/Mechanics [physics], [PHYS.MECA] Physics [physics]/Mechanics [physics], plaques minces
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; Dans quelle direction se propage une fissure soumise à un chargement donné? La réponse à cette question apparemment simple n'est pas encore établie si le matériau considéré est anisotrope. En effet les critères habituels (principe de symétrie locale par exemple) ne s'appliquent pas. Nous présentons des expériences de déchirures sur des feuilles fragiles qui sont homogènes mais anisotropes de par leur fabrication (extrusion). Si l'anisotropie est forte, certaines directions de propagation ne sont jamais observées, et semblent interdites. Nous proposons une analogie avec la forme des cristaux: nous verrons comment des angles interdits dans la propagation sont liés à une perte de convexité de l'énergie de rupture. Une situation similaire est liée a la présence d'arêtes vives sur la forme d'équilibre de cristaux.

Published
2013

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