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Your search keyword '"Ozawa, Akio"' showing total 34 results
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34 results on '"Ozawa, Akio"'

8. Observation of Lightning at 500kV Transmission Lines (Part 1)

Author

Ozawa Akio, Masaki Nakada, Takehiko Kikuchi, Katsuhiro Ouchi, and Yoshihisa Tamura

Subjects
Meteorology, Energy Engineering and Power Technology, Lightning, Electric power transmission, Shielding Failure, Transmission line, Waveform, Distribution of lightning, Electrical and Electronic Engineering, Tower, Seismology, Geology, Transmission tower, Remote sensing
Abstract

We investigated the phenomenon of lightning strokes on 500-kV transmission lines from 1984 to 1993. The investigation covered the recording of lightning paths by still cameras and measurements of lightning current at the lower part of transmission tower on 31 towers, over a 12.7-km-long section of the transmission line. We also observed lightning on an isolated tower at a nuclear power station. In the course of lightning observations spanning a 10-year period, we have confirmed the suitability of the lightning protection design on transmission lines. The distribution of lightning incidence angle (θ) expressed in terms of (cosmθ) was characterized by exponent m = 2 for the three-dimensional observations and m = 3.5 for the two-dimensional observations. No cases of shielding failure on 500-kV transmission lines were observed. The ratio of lightning current at the top of the isolated tower to the lower part was about 11 to 1. In addition, the lightning current waveform at the top of the isolated tower was similar to that at the lower part. © 1999 Scripta Technica, Electr Eng Jpn, 130(2): 59–67, 2000

Published
1997
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25. Valproic Acid Enhances In VitroDevelopment and Oct-3/4 Expression of Miniature Pig Somatic Cell Nuclear Transfer Embryos

Author

Miyoshi, Kazuchika, Mori, Hironori, Mizobe, Yamato, Akasaka, Eri, Ozawa, Akio, Yoshida, Mitsutoshi, and Sato, Masahiro

Abstract

AbstractThe present study was carried out to examine the effects of valproic acid (VPA), a histone deacetylase inhibitor, on in vitrodevelopment of miniature pig somatic cell nuclear transfer (SCNT) embryos and on expression of a mouse Oct-3/4 promoter-driven enhanced green fluorescent protein (EGFP) gene (EGFP expression only detected in Oct-3/4-expressing cells) introduced into donor cells for SCNT during their development. The addition of 4?mM VPA to embryo culture medium for 48?h after activation significantly (p?

Published
2010
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26. Blood & Vessel

Author

HIRAI, Aizan, primary, TERANO, Takashi, additional, HAMAZAKI, Tomohito, additional, SAJIKI, Junko, additional, KONDO, Shigemi, additional, OZAWA, Akio, additional, TAMURA, Yasushi, additional, and KUMAGAI, Akira, additional

Published
1982
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33. Computer-aided volumetry of pulmonary nodules exhibiting ground-glass opacity at MDCT.

Author

Oda S, Awai K, Murao K, Ozawa A, Yanaga Y, Kawanaka K, and Yamashita Y

Subjects
Aged, Female, Humans, Male, Middle Aged, Phantoms, Imaging, Reproducibility of Results, Software, Lung Neoplasms diagnostic imaging, Radiographic Image Interpretation, Computer-Assisted methods, Solitary Pulmonary Nodule diagnostic imaging, Tomography, X-Ray Computed methods
Abstract

Objective: The purpose of this study was to investigate the accuracy and reproducibility of results acquired with computer-aided volumetry software during MDCT of pulmonary nodules exhibiting ground-glass opacity., Materials and Methods: To evaluate the accuracy of computer-aided volumetry software, we performed thin-section helical CT of a chest phantom that included simulated 3-, 5-, 8-, 10-, and 12-mm-diameter ground-glass opacity nodules with attenuation of -800, -630, and -450 HU. Three radiologists measured the volume of the nodules and calculated the relative volume measurement error, which was defined as follows: (measured nodule volume minus assumed nodule volume / assumed nodule volume) x 100. Two radiologists performed two independent measurements of 59 nodules in humans. Intraobserver and interobserver agreement was evaluated with Bland-Altman methods., Results: The relative volume measurement error for simulated ground-glass opacity nodules measuring 3 mm ranged from 51.1% to 85.2% and for nodules measuring 5 mm or more in diameter ranged from -4.1% to 7.1%. In the clinical study, for intraobserver agreement, the 95% limits of agreement were -14.9% and -13.7% and -16.6% to 15.7% for observers A and B. For interobserver agreement, these values were -16.3% to 23.7% for nodules 8 mm in diameter or larger., Conclusion: With computer-aided volumetry of ground-glass opacity nodules, the relative volume measurement error was small for nodules 5 mm in diameter or larger. Intraobserver and interobserver agreement was relatively high for nodules 8 mm in diameter or larger.

Published
2010
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34. Valproic acid enhances in vitro development and Oct-3/4 expression of miniature pig somatic cell nuclear transfer embryos.

Author

Miyoshi K, Mori H, Mizobe Y, Akasaka E, Ozawa A, Yoshida M, and Sato M

Subjects
Animals, Cell Nucleus genetics, Dose-Response Relationship, Drug, Embryo Culture Techniques methods, Embryo Transfer methods, Embryo, Mammalian cytology, Embryo, Mammalian metabolism, Fluorescent Dyes metabolism, Green Fluorescent Proteins genetics, Green Fluorescent Proteins metabolism, Octamer Transcription Factor-3 genetics, Swine, Time Factors, Transfection veterinary, Embryonic Development drug effects, Enzyme Inhibitors pharmacology, Nuclear Transfer Techniques veterinary, Octamer Transcription Factor-3 metabolism, Swine, Miniature embryology, Valproic Acid pharmacology
Abstract

The present study was carried out to examine the effects of valproic acid (VPA), a histone deacetylase inhibitor, on in vitro development of miniature pig somatic cell nuclear transfer (SCNT) embryos and on expression of a mouse Oct-3/4 promoter-driven enhanced green fluorescent protein (EGFP) gene (EGFP expression only detected in Oct-3/4-expressing cells) introduced into donor cells for SCNT during their development. The addition of 4 mM VPA to embryo culture medium for 48 h after activation significantly (p < 0.01) increased the blastocyst formation rate of SCNT embryos compared with the control, whereas VPA did not affect their cleavage rate. The rate of SCNT embryos expressing EGFP at 5 days of culture was not affected by the presence or absence of VPA treatment. At 7 days of culture, however, the addition of 4 mM VPA to embryo culture medium for 48 h after activation significantly (p < 0.05) increased the rate of SCNT embryos expressing EGFP compared with the control. The results indicate that VPA enhances the ability of miniature pig SCNT embryos to develop into blastocysts and maintains the ability of them to express Oct-3/4 gene.

Published
2010
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