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503 results on '"MIZUTANI, Hiroshi"'

1. Home-run probability as a function of the coefficient of restitution of baseballs

Author

Kuninaka, Hiroto, Kosaka, Ikuma, and Mizutani, Hiroshi

Subjects
Physics - Physics and Society
Abstract

In baseball games, the coefficient of restitution of baseballs strongly affects the flying distance of batted balls, which determines the home-run probability. In Japan, the range of the coefficient of restitution of official baseballs has changed frequently over the past five years, causing the the number of home runs to vary drastically. We analyzed data from Japanese baseball games played in 2014 to investigate the statistical properties of pitched balls. In addition, we used the analysis results to develop a baseball-batting simulator for determining the home-run probability as a function of the coefficient of restitution. Our simulation results are explained by a simple theoretical argument., Comment: 18 pages, 10 figures, resubmitted to Am. J. Phys

Published
2015

3. Transdisciplinary co-design of scientific research agendas: 40 research questions for socially relevant climate engineering research

Author

Sugiyama, Masahiro, Asayama, Shinichiro, Kosugi, Takanobu, Ishii, Atsushi, Emori, Seita, Adachi, Jiro, Akimoto, Keigo, Fujiwara, Masatomo, Hasegawa, Tomoko, Hibi, Yasushi, Hirata, Kimiko, Ishii, Toru, Kaburagi, Takeshi, Kita, Yuki, Kobayashi, Shigeki, Kurosawa, Atsushi, Kuwata, Manabu, Masuda, Kooiti, Mitsui, Makoto, Miyata, Taku, Mizutani, Hiroshi, Nakayama, Sumie, Oyamada, Kazuyo, Sashida, Takaaki, Sekiguchi, Miho, Takahashi, Kiyoshi, Takamura, Yukari, Taki, Junichi, Taniguchi, Taketoshi, Tezuka, Hiroyuki, Ueno, Takahiro, Watanabe, Shingo, Watanabe, Rie, Yamagishi, Naoyuki, and Yoshizawa, Go

Published
2017
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26. Design considerations for traveling-wave single-pole multithrow MMIC switch using fully distributed FET

Author

Mizutani, Hiroshi, Iwata, Naotaka, Takayama, Yoichiro, and Honjo, Kazuhiko

Subjects
Microwave integrated circuits -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The circuit design considerations for the traveling-wave switch (TWSW) single-pole double-throw (SPDT) monolithic microwave integrated circuit (MMIC) utilizing a fully distributed FET (FD-FET) are presented here for the first time. The normalized length of the impedance transformer for a single-pole multithrow TWSW using the FD-FET is found to be less than a quarter-wavelength at the operating frequency. Unlike the TWSW using lumped FETs, the TWSW with the FD-FET offers the advantage of no design limits regarding such frequency characteristics as bandwidth and group delay. The newly developed SPDT TWSW MMIC using the 400-[micro]m-gate finger FD-FET delivers broadband characteristics over more than an octave frequency range with highly reliable MMIC technology. The newly developed SPDT MMIC switch provides low insertion loss of less than 2.1 dB and high isolation of over 25.5 dB from 38 to 80 GHz, coupled with the benefit of very small size. Index Terms--Distributed FET, millimeter wave, monolithic microwave integrated circuit (MMIC), single-pole double-throw (SPDT) switch, traveling wave.

Published
2007

42. Compact DC-60-Ghz HJFET MMIC switches using ohmic electrode-sharing technology

Author

Mizutani, Hiroshi, Funabashi, Masahiro, Kuzuhara, Masaaki, and Takayama, Yoichiro

Subjects
Circuit design -- Models, Millimeter wave devices -- Design and construction, Switches -- Design and construction, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Compact dc-60-GHz heterojunction field-effect transistor (HJFET) monolithic-microwave integrated-circuit (MMIC) switches have been demonstrated for millimeter-wave communications and radar systems. To reduce the MMIC chip size, a novel ohmic electrode-sharing technology (OEST) has been developed for MMIC switches with series - shunt FET configuration. Four FET's of the series-shunt single-pole double-throw (SPDT) MMIC switch were integrated into an area of approximately 0.018 [mm.sup.2]. The developed MMIC switches have a high power-handling capability with low insertion loss (IL) and high isolation (Iso) at millimeter-wave frequencies. From dc to 60 GHz, the single-pole single-throw (SPST) MMIC switch achieved the IL and Iso of better than 1.64 and 20.6 dB, respectively. At 40 GHz, the IL increases by 1 dB at the input power of 21 dBm. A novel large-signal FET model for the switch circuit is presented. The simulated power.transfer performance shows the excellent agreement with the measured one. The developed MMIC switches will contribute to the low-cost and high-performance millimeter-wave communications and radar systems. Index Terms - FET's, MMIC switches, modeling, nonlinear circuits.

Published
1998

44. 13C and 15N enrichment factors of feathers of 11 species of adult birds

Author

Mizutani, Hiroshi, Fukuda, Michio, and Kabaya, Yuko

Subjects
Feathers -- Research, Carbon -- Isotopes, Nitrogen -- Isotopes, Food chains (Ecology) -- Research, Birds -- Food and nutrition, Biological sciences, Environmental issues
Abstract

The use of stable isotopes of bioelements to analyze diets of animals in nature requires precise knowledge of any changes in the isotope ratios that take place after assimilation. Therefore, the influence of diet on the distribution of carbon and nitrogen isotopes in feathers of 11 species of birds on a constant diet was studied. The standard deviation in [delta.sup.13]C and [delta.sup.15]N in naturally obtained foods like fish during 6 yr was [is nearly equal] 1%. Factory-manufactured pellets generally gave lower deviations (0.2% for [delta.sup.13]C and [is nearly equal] 0.6% for [delta.sup.15]N). Feathers showed an enrichment relative to food in both [C.sup.13] and [N.sup.15], its extent varied among different bird species. Isotope ratios for [C.sup.13] and [N.sup.15] from diet to feathers converged. The nature of the enrichment factors is discussed in relation to the convergence and temporal window size. Neither enrichment showed an age dependency among adult birds, and neither depended on the nitrogen content in the bird's diet. These results show that the stable isotope approach can be applied not only to these 11 species but to birds whose isotope enrichment factors are so far unknown.

Published
1992

47. Ecological traits and their diversities of five Zostera marina populations in and around Hiroshima Bay, the Seto Inland Sea, Japan

Author

Yoshida, Goro, Tanimoto, Terumi, Aida, Satoshi, Kajita, Atsushi, Mizutani, Hiroshi, Omoto, Shigeyuki, Saito, Kenji, Moriguchi, Akihiko, Hori, Masakazu, Hamaguchi, Masami, and Terawaki, Toshinobu

Subjects
density, 地域個体群, biomass, local population, seagrass, 株密度, 海草, Zostera marina, アマモ, 現存量
Abstract

広島湾および周辺海域の5カ所の生育地のアマモZostera marinaの生態的特性を2004年の繁茂期に調査した。調査場所は広島湾奥部の阿品（St.1），同湾央部の大黒神島（St.2），同湾口部の屋代島（St.3），柳井湾奥部の伊保庄（St.4），および同湾外部に位置する平郡島（St.5）である。アマモの分布水深は生育地により異なり，St.1，St.2では海底でのアオサ類等の堆積により，分布下限水深は1-2m（C.D.L. 基準）までである一方，他の生育地では4-6mまで分布した。アマモの平均現存量は120-180g DWm-2の範囲にあったが，アマモの株のサイズと密度は生育地により異なっていた。平均株密度は生育地により88-278 shoots m-2の範囲であり，St.3およびSt.5では特に浅所で小型の株が密生した。これらの群落では，総現存量に占める地下部現存量の割合が相対的に大きかった。一方，湾奥部に位置するSt.1とSt.4では，アマモの株は大型である一方生育密度は低かった。群落内の底質の粒度組成の相違から，波浪流動等の物理的環境が生育地間で異なることが示唆され，それぞれの場所のアマモの生態的特性はその影響を受けていると考えられた。, Ecological traits of five Zostera marina populations in and around Hiroshima Bay were investigated in a luxuriant season of 2004. Study sites were located at the most inner (Ajina; St.1), center (O-kurokami-jima; St. 2) and near the mouth area (northern coast of Yahiro-jima; St. 3) of Hiroshima Bay, and at the inner area (Ihono-sho; St. 4) and the outside (Heigun-jima; St.5) of Yanai Bay which is the strait adjacent to Hiroshima Bay. The distribution depth (C.D.L.) was different among the populations. The lower depth of Zostera distribution was limited to 1-2 m at St.1 and 2 by algal-mat of Ulva spp. and other macroalgae, though it was 4-6 m at St. 3-5. Mean biomass was ranged in 120-180g DWm-2, but shoot size and density was different among the populations. Mean density ranged between 88-278 shoots m-2, and the populations at St.3 and 5 exhibited higher densities with smaller shoots especially in shallow stands of the two population. These stands also exhibited higher proportion of below-ground biomass to total biomass. On the contrary, populations in inner areas (St. 1 and 4) exhibited lower density with larger shoots. Physical conditions such as water motion induced by waves were different among the habitats which were shown in grain size compositions of the sediments, and this could affect the ecological traits of each Z. marina population., 本調査は，水産庁委託「生物多様性に配慮したアマモ場造成技術開発調査事業」（平成16～18年度）の一環として実施されたものである。

Published
2013

49. On the Evolution of Macromolecules

Author

Mizutani, Hiroshi, Okihana, Hiroyuki, Hasegawa, Masami, Yano, Taka-aki, Noda, Haruhiko, Dose, K., editor, Fox, S. W., editor, Deborin, G. A., editor, and Pavlovskaya, T. E., editor

Published
1974
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