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Your search keyword '"Kawada, Takashi"' showing total 28 results
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28 results on '"Kawada, Takashi"'

4. Simplified procedure for interferometric determination of electro-optic properties of low-Tg photorefractive polymer.

Author

Fujihara, Takashi, Sassa, Takafumi, Kawada, Takashi, Mamiya, Jun-ichi, Muto, Tsuyoshi, and Umegaki, Shinsuke

Subjects
INTERFEROMETRY, ELECTROOPTICS, PHOTOREFRACTIVE materials, POLYMERS, DOUBLE refraction
Abstract

A simplified procedure is proposed for the interferometric determination of optical dispersions of refractive-index changes in a low-Tg photorefractive (PR) polymer. A two-level model for the optical dispersions is used in order to separately evaluate the index changes occurring due to molecular birefringence and first-order electronic electro-optic effects. This evaluation is done by estimating the contributions of the two effects in the low-frequency limit of a modulating voltage. The evaluated results are compared with those determined by a PR two-beam coupling experiment. [ABSTRACT FROM AUTHOR]

Published
2010
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6. Simplified procedure for interferometric determination of electro-optic properties of low-[T.sub.g] photorefractive polymer

Author

Fujihara, Takashi, Sassa, Takafumi, Kawada, Takashi, Mamiya, Jun-ichi, Muto, Tsuyoshi, and Umegaki, Shinsuke

Subjects
Refraction, Double -- Analysis, Electrooptics -- Analysis, Interferometers -- Usage, Polymers -- Electric properties, Polymers -- Optical properties, Refractive index -- Measurement, Physics
Abstract

A simplified procedure is described for the interferometric determination of optical dispersions of refractive-index changes in a low-[T.sub.g] photorefractive (PR) polymer. A two-level model is used for the optical dispersions in order to separately evaluate the index changes occurring because of molecular birefringence and first-order electronic electro-optic effects.

Published
2010

7. Panoramic Measurement and Analysis of Strain Distribution in the Human ACL Using a Photoelastic Coating Method

Author

Kawada Takashi, Yamamoto Kouji, and Hirokawa Shunji

Subjects
Engineering drawing, Materials science, Mechanical Engineering, musculoskeletal system, Industrial and Manufacturing Engineering, surgical procedures, operative, Tilt (optics), All fiber, Mechanics of Materials, Strain distribution, Femoral bone, Photoelastic coating, human activities, Biomedical engineering
Abstract

Large and highly variable deformations of the ACL cannot be adequately quantified by one-dimensional and/or localized measurements. Since the complex anatomy of the ACL makes uniform loading of all fiber bundles almost impossible, strains on specific portions being tested are considerably altered during knee movement. To observe the ACL's entire surface, we propose a photoelastic coating method. A simulator jig was used to allow a natural motion of the knee whose medial and lateral femoral bone parts were removed in order to expose the ACL for observation. The simulator jig with the knee was mounted on a universal stand which allows tilt and swivel rotations, so that the exposed ACL might be viewed from any direction. Measurements were performed on the strain distributions over the ACL at various knee angles. The panoramic images of the photoelastic fringe patterns yielded significant results.

Published
2001
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