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4. [Untitled]

Author

Takeshi Asai, Kazuya Seo, Osamu Kobayashi, Masahide MURAKAMI, Daisuke NISHIKIORI, Taketo MIZOTA, Hiroyuki KUBA, Tetsuya SHIMIZU, Ryutaro HIMENO, Tetsuya TANIGUCHI, Shiro OKEDA, Takeshi MIYAZAKI, Takashi GOTO, Masahiro NONAKA, Katsumi AOKI, Taketo Mizota, Sungmin Park, Tomokazu Fukamachi, and Takeshi Naruo

Published
2004
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7. Erratic Behavior of Less Spinning Soccer Ball Flight

Author

Takashi Nomura, Yuji Ohya, Makoto Kanda, Manabu Yamamoto, Kazuyuki Yamamoto, Satoki Ogura, Sungil Hone, Yasuhiro Nagatsuka, Gideon P. A. G. van Zijl, Hiroshi Hasebe, Atsushi Okajima, Naoto Watanabe, Koji Kondo, Eizo Maruta, Taketo Mizota, Yukio Tamura, Lisa Alberti, Kazuki Hibi, Hirotoshi Kikuchi, Tomohisa Naeki, and Yuka Isono

Subjects
Materials science, Ball (bearing), Composite material, Spinning
Published
2007
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9. [Untitled]

Author

Koji KONDO, Yutaka ASAMI, Kazuki HIBI, Tomotaka Hamada, Ryoji Iwasaki, Hang Choi, Jun Kanda, Kohji HASHIDA, Yoshiyuki ONO, Tetsuro TAMURA, Daisuke NISHIKIORI, Taketo MIZOTA, Hiroaki KONISHI, Hitoshi SHIMOZONO, Yoshiyuki KAWAMURA, Sungmin Park, Takeshi Naruo, Takashi NOMURA, Tomoharu ITAMI, Masayuki TANAKA, Hiromasa Nakayama, Kouichi Sada, Seiji NAKATO, Kichiro KIMURA, Takeshi ISHIHARA, and Yozo FUJINO

Subjects
Physics
Published
2003
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10. Issues on the Promotion of Wind Engineering for the Next Generation

Author

Yoshiharu Iwatani, Yozo Fujino, Fumiaki Kobayashi, Jun Kanda, Yasuo Okuda, Tomomi Yagi, Yasushi Uematsu, Taketo Mizota, and Takashi Nomura

Subjects
Engineering, Architectural engineering, Promotion (rank), business.industry, media_common.quotation_subject, business, Wind engineering, media_common
Published
2002
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13. Bluff Body (Fundamental Problem & Vehicle)

Author

Mutsumi Uemura, Taketo Mizota, Ni Zhangsong, Kichiro Kimura, Yoji Suzuki, Yozo Fujino, Nobuyuki Kobayashi, Hiroaki Nishimura, Songpol Phongkumsing, Takashi Nomura, Hiromasa Kawai, K. Fujinami, Katsuji Tanemoto, Yoshihito Taniike, Li Mingshui, Wang Weihua, Chen Xin, Tomoyuki Kokita, Tatsuo Maeda, and Suzuki Minoru

Subjects
Bluff, Geology, Marine engineering
Published
2001
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15. Erratic Behavior of Forkball

Author

Taketo Mizota, Atsushi Okajima, Shinichiro O-Hara, and Hiroyuki Kuba

Subjects
Aerodynamic force, Engineering, Aerodynamic lift, Gravity force, business.industry, Ball (bearing), Vertical axis, Magnus effect, Aerodynamics, Mechanics, business
Abstract

Aerodynamic behavior of forkball and fastball are studied in a stand point of fluid dynamic research. The fastball rotates in backspin and aerodynamic lift force acts on it is toward upward by Magnus effects. This lift force is the same magnitude with gravity force for good fastball. As a result, the fastball trajectory is nearly straight toward homebase after detaching pitcher's finger. The other hand, good forkball spins around vertical axis. In this case, less lift force and only the gravity force act on the ball. The flight trajectory of the forkball results in vertically sinking line only by the gravity force and laterally sliding one by side spinning effects in its final stage near the homebase.

Published
1997
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16. Erratic Behaviour of Knuckleball

Author

Atsushi Okajima, Taketo Mizota, and Hiroyuki Kuba

Subjects
Engineering, business.industry, Reynolds number, Aerodynamics, Mechanics, Physics::Fluid Dynamics, Lift (force), Aerodynamic force, Physics::Popular Physics, symbols.namesake, Drag, symbols, Fluid dynamics, Flutter, business, Wind tunnel
Abstract

Erratic behaviour of knuckleball is studied by quasi- steady aerodynamic theory. On TV, We observed ball trajectory, spin rate and its axes of knuckleball pitched by Tim Wakefield who belongs to Pittsburg Pirates of national league. The dependence of Reynolds number for aerodynamic forces of drag, lift and side force are measured with change of seam position by wind tunnel testing. Three dimensional equations for the force equilibrium are shown and solved under quasi-steady approximation of aerodynamic forces acting on the ball. Various types of knuckleball trajectory which were commented by major league batters with fuzzy expressions are shown on the computer screen. Flutter experiments were conducted using wind tunnel. Oscillation amplitude of knuckleball by flutter analysis corresponded well with the results of flutter experiment. We conclude that the erratic behaviour of knuckleball is a flutter phenomenon such as unstable one of bluff body immersed in a fluid flow.

Published
1995
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17. Wind-measuring instruments and systems

Author

Taketo Mizota, Gen'ichi Naito, Teruyuki Itoh, Noriko Chino, Atsushi Okajima, Yoshiteru Iwasa, and Tokunosuke Fujitani

Subjects
Measuring instrument, Environmental science, Remote sensing
Published
1990
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19. Wind Engineers, JAWE

Author

Asai, Takeshi, primary, Seo, Kazuya, additional, Kobayashi, Osamu, additional, MURAKAMI, Masahide, additional, NISHIKIORI, Daisuke, additional, MIZOTA, Taketo, additional, KUBA, Hiroyuki, additional, SHIMIZU, Tetsuya, additional, HIMENO, Ryutaro, additional, TANIGUCHI, Tetsuya, additional, OKEDA, Shiro, additional, MIYAZAKI, Takeshi, additional, GOTO, Takashi, additional, NONAKA, Masahiro, additional, AOKI, Katsumi, additional, Mizota, Taketo, additional, Park, Sungmin, additional, Fukamachi, Tomokazu, additional, and Naruo, Takeshi, additional

Published
2004
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21. Erratic Behavior of Less Spinning Soccer Ball Flight

Author

Mizota, Taketo, primary, Yamamoto, Kazuyuki, additional, Ogura, Satoki, additional, Ohya, Yuji, additional, Okajima, Atsushi, additional, YAMAMOTO, Manabu, additional, KONDO, Koji, additional, HASEBE, Hiroshi, additional, NAEKI, Tomohisa, additional, WATANABE, Naoto, additional, NOMURA, Takashi, additional, Kikuchi, Hirotoshi, additional, Tamura, Yukio, additional, Hibi, Kazuki, additional, Hone, Sungil, additional, Zijl, Gideon van, additional, Alberti, Lisa, additional, NAGATSUKA, Yasuhiro, additional, ISONO, Yuka, additional, KANDA, Makoto, additional, and MARUTA, Eizo, additional

Published
2007
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23. Wind Engineers, JAWE

Author

KONDO, Koji, primary, ASAMI, Yutaka, additional, HIBI, Kazuki, additional, Hamada, Tomotaka, additional, Iwasaki, Ryoji, additional, Choi, Hang, additional, Kanda, Jun, additional, HASHIDA, Kohji, additional, ONO, Yoshiyuki, additional, TAMURA, Tetsuro, additional, NISHIKIORI, Daisuke, additional, MIZOTA, Taketo, additional, KONISHI, Hiroaki, additional, SHIMOZONO, Hitoshi, additional, KAWAMURA, Yoshiyuki, additional, Park, Sungmin, additional, Naruo, Takeshi, additional, NOMURA, Takashi, additional, ITAMI, Tomoharu, additional, TANAKA, Masayuki, additional, Nakayama, Hiromasa, additional, Sada, Kouichi, additional, NAKATO, Seiji, additional, KIMURA, Kichiro, additional, ISHIHARA, Takeshi, additional, and FUJINO, Yozo, additional

Published
2003
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24. Wind Engineers, JAWE

Author

KIKUGAWA, Hironori, primary, MIYAGI, Hiromori, additional, OZONO, Shigehira, additional, NAGATOMO, Makoto, additional, KATO, Hideaki, additional, NODA, Minoru, additional, UTSUNOMIYA, Hidehiko, additional, NAGAO, Fumiaki, additional, SHIRAISHI, Nobuhiro, additional, ADACHI, Koichi, additional, MATSUMOTO, Takeo, additional, Kwon, Changki, additional, Takahashi, Takaomi, additional, Takenaga, Tomoyasu, additional, Jyonbin, Oh, additional, Torii, Kouhei, additional, Mizota, Taketo, additional, Kawamura, Yoshiyuki, additional, Uchimura, Masashi, additional, Park, Sungmin, additional, YAMAZAKI, Shinya, additional, YAMASHITA, Taro, additional, KOHAMA, Yasuaki, additional, SAWADA, Hideo, additional, KUNIMASU, Tetsuya, additional, SUDA, Shinichi, additional, YOSHIDA, Akihito, additional, TAMURA, Yukio, additional, MATSUI, Masahiro, additional, and ISHIBASHI, Sotoshi, additional

Published
2003
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26. Bluff Body (Fundamental Problem & Vehicle)

Author

NOMURA, Takashi, primary, SUZUKI, Yoji, additional, UEMURA, Mutsumi, additional, KOBAYASHI, Nobuyuki, additional, Mingshui, Li, additional, Weihua, Wang, additional, Zhangsong, Ni, additional, Xin, Chen, additional, Kawai, H., additional, Fujinami, K., additional, NISHIMURA, Hiroaki, additional, TANIIKE, Yoshihito, additional, Kokita, Tomoyuki, additional, Mizota, Taketo, additional, PHONGKUMSING, Songpol, additional, KIMURA, Kichiro, additional, FUJINO, Yozo, additional, SUZUKI, Minoru, additional, TANEMOTO, Katsuji, additional, and MAEDA, Tatsuo, additional

Published
2001
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32. Wind-measuring instruments and systems

Author

OKAJIMA, Atsushi, primary, NAITO, Gen'ichi, additional, FUJITANI, Tokunosuke, additional, MIZOTA, Taketo, additional, IWASA, Yoshiteru, additional, CHINO, Noriko, additional, and ITOH, Teruyuki, additional

Published
1990
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34. Experimental studies of separated flows around stationary and oscillating rectangular prisms in a uniform flow

Author

Taketo Mizota

Subjects
Physics::Fluid Dynamics, Physics, Aerodynamic force, Classical mechanics, Oscillation, Streamlines, streaklines, and pathlines, Potential flow, Mechanics, Flow pattern, Instability, Excitation, Vortex
Abstract

Measurements of time-averaged and unsteady two-dimensional velocity distributions are made for stationary and oscillating rectangular prisms using a new technique of a tandem type hot-wire probe. The time-averaged and unsteady streamlines around the models are presented and their correspondence to aerodynamic forces are discussed. The features of the flow patterns around the models which experience galloping oscillation, vortex excitation and low speed instability are described.

Published
1982
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