著者

鯰江 一也 栗田 裕 松村 雄一

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference 2006 (ISSN:24242993)

巻号頁・発行日

pp._164-1_-_164-6_, 2006-08-06 (Released:2017-06-19)

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This paper describes a transitional wave phenomenon in synchronous flashing of fireflies. We used self-excited oscillator, consists of amplification element, saturation element and phase delay element. To simulate a transitional wave phenomenon, the self-excited oscillator simulated the firefly shouldn't be late from the detection of the flashing of other self-excited oscillator. The period of self-excited oscillator in the transient state depends on strength of own flashing and changes. Strengthening strength of own flashing, perceived the flashing of other self-excited oscillators, the timing of flashing shifts and withdraws by correcting it at a constant period. This is a transitional wave phenomenon.

著者

松村 雄

出版者

那須塩原市那須野が原博物館

雑誌

那須野が原博物館紀要 (ISSN:13499238)

巻号頁・発行日

vol.3, no.1, pp.1-18, 2007-03-01 (Released:2020-02-13)

著者

谷田 涼 内野 敬太 松村 雄一

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference 2010 (ISSN:24242993)

巻号頁・発行日

pp._740-1_-_740-6_, 2010-09-14 (Released:2017-06-19)

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This paper clarified the excitation mechanism of picking the strings of a guitar. The picking excites forced vibration and free vibration of the strings by giving the strings impact force, friction force and initial condition. At first, separate influence of these force and initial condition was experimentally examined. Then, generation mechanism of transient responses of the strings was examined for ordinary picking technique, by the viewpoint of the influence of impact force, friction force and initial condition.

著者

乾 順紀 長ヶ原 誠 彦次 佳 谷 めぐみ 薗田 大地 松村 雄樹 青山 将己 松﨑 淳 三浦 敬太 山下 耕平

出版者

日本生涯スポーツ学会

雑誌

生涯スポーツ学研究 (ISSN:13488619)

巻号頁・発行日

pp.2022-2, (Released:2022-08-24)

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The purpose of this study is to examine how the experience of belonging to athletic clubs during adolescence affects an individual's involvement status in sports later in life, and whether the influence differs depending on an individual's age group. Web surveys were given to those over the age of 18 living in the Kansai area. The survey remained open for participants to respond until the total number of responses reached 10,000, and the survey occurred between December 6–10, 2018. First, we treated the experience of belonging to athletic clubs in junior high school and high school as one of two values, either "belonged" or "did not belong." Then, they were divided into four groups as career patterns. In order to examine the relationship between sports career patterns of belonging to athletic clubs and an individual's current sports involvement status, we performed a one-way analysis of variance test. Next, in order to examine the relationship between the effect of the sports career patterns in youth and age, we performed a two-way ANOVA using career patterns and age groups as independent variables and the number of sports participated in and watched over the past year as dependent variables. The results of the ANOVA show significant differences in all items, such as exercise frequency and sports watching and volunteering habits. As the results of the two-way ANOVA show, the effect of the career patterns was significant in all items, and the effect of age groups was also significant in most items. Having experience in athletic club activities in adolescence may significantly contribute to the expansion of an individual's range of exercise and sports involvement after entering adulthood.

著者

大浦 靖典 栗田 裕 松村 雄一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.73, no.731, pp.1985-1991, 2007-07-25

被引用文献数

5

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This study examines the influence of dynamic stiffness in the contact region on disk brake squeal. The frequency of squeal becomes higher as the thrust pressure grows larger. We think the cause of this phenomenon is that the stiffness of the pad depends on thrust pressure, because the vibration characteristics of the disk and the caliper are not change by thrust pressure. Therefore, we measure the contact stiffness of the pad. The results show that the stiffness of the pad has pressure dependency. To clarify the influence of the pad stiffness on squeal, we analyze the disk-pad-caliper system as the surface contact analysis model, which combines the disk with the pad-caliper by distributed springs.

著者

栗田 裕 松村 雄一 神田 真一 絹笠 裕直

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.74, no.741, pp.1333-1339, 2008-05-25 (Released:2011-03-04)

参考文献数

6

被引用文献数

1

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Quadruped animals switch gait patterns with walking frequency for energy-effective walking. This is similar to the phenomenon that excited natural vibration modes are switched with vibration frequency in a MDOFs system. Therefore, in this paper, it is assumed that quadruped animals walk by using the natural vibration of their own musculoskeletal systems. In the simplest rigid-body-link model consisting of a body and four legs, there are the natural vibration modes similar to the gait patterns (trot, pace and gallop) of quadruped animals. However, all the natural frequencies in the model exist near the natural frequency in the free leg, and are accordingly different from the walking frequencies of actual quadruped animals. In the rigid-body-link model added a scapular and a pelvic on observations of quadrupted walking, the natural frequency of the gallop mode corresponding to high speed walking raises greatly and approaches the walking frequency. If the physical characteristics of horses were applied to the rigid-body-link model added the leg's joints, the natural vibration in the model is close to the gait patterns of horses.

著者

松尾 和人 川島 茂人 杜 明遠 斎藤 修 松井 正春 大津 和久 大黒 俊哉 松村 雄 三田村 強

出版者

農業環境技術研究所

雑誌

農業環境技術研究所報告 (ISSN:09119450)

巻号頁・発行日

no.21, pp.41-73, 2002-03 (Released:2011-12-19)

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Bt遺伝子組換えトウモロコシンは,1995年に米国で初めて商業用に登録された。その後,このBt遺伝子組換えトウモロコシは標的害虫であるアワノメイガなどに対して抵抗性を有するために,防除経費の削減,収量の増加,品質の向上など生産面での有利性があるために,米国を中心に年を追って作付け面積が拡大した。一方,わが国では遺伝子組換え作物の加工用および栽培用の種子輸入に当たって,食品としての安全性は厚生労働省が,飼料としての安全性および環境への安全性は農林水産省の確認が必要である。農林水産省による環境に対する安全性の確認は,隔離圃場において組換え作物の栽培・繁殖特性,越冬可能性,雑草化の可能性,近縁種との交雑可能性等について調査した結果に基づいて行われている。ところで,1999年に米国コーネル大学のLoseyら(1999)が,Bt遺伝子組換えトウモロコシの花粉が非標的昆虫のオオカバマダラの幼虫に悪影響をもたらす可能性があるという報告を行い,新しい環境影響として世界中に衝撃を与えた。しかし,彼らの報告は,幼虫に与えた花粉量や野外における葉上の花粉堆積の実態等について触れていなかったために,環境影響の有無や程度は不明であり,今後解明すべき課題として残された。日本においても,そのような観点から遺伝子組換え作物の環境影響評価を行う必要があるため,緊急にBt遺伝子組換えトウモロコシの環境影響評価に関する調査研究に取り組むこととなった。本研究では,Bt遺伝子組換えトウモロコシの花粉の飛散によるチョウなど鱗翅目昆虫に及ぼす影響を知るために,1)トウモロコシ圃場から飛散する花粉の実態調査とトウモロコシ圃場からの距離ごとの落下花粉密度の推定,2)幼虫が摂食して影響を受けるBt花粉の密度,3)Bt花粉中のBtトキシン含有量,4)環境変化に対して脆弱であると考えられる鱗翅目昆虫の希少種について,栽培圃場周辺に生息する可能性,Bt遺伝子組換えトウモロコシの開花時期と幼虫生育期との重なり,採餌行動など,総合的な知見に基づいてリスク評価を行い,同時に,花粉飛散に伴う生態系への影響評価のための各種手法を開発した。