著者

山本 征治

出版者

九州歯科学会

雑誌

九州歯科学会雑誌 (ISSN:03686833)

巻号頁・発行日

vol.57, no.6, pp.169-176, 2003

参考文献数

33

被引用文献数

2

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In recent years, various kinds of sports populations of youths and elders are dramatically increasing. In order that these support population can participate in a sport more happily and more safely, we have to take the safety measures for preventing serious injury of the oral maxillofacial region. Especially, for contact sports, mouth-guards, shoulder pads, leg-guards, tapings are need to be equipped as a protector for traumatic injury, It was reported that mouth-guards were useful not only to prevent injury, but to improve sport capability, and a relationship between the physiological function of the oral maxillofacial region and physical activity came to attract attention. In this paper, I will discuss the present status and the future view of sports dentistry, such as the efficacy of mouth-guards and occlusal relation on physical capability, based on the previous scientific reports and articles related to sports dentistry.

著者

大友 光彰 鈴置 哲典 山本 征治 宮川 浩

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 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.17-00044-17-00044, 2017 (Released:2017-06-25)

参考文献数

5

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This paper studies the condition of reducing knock intensity which is the pressure oscillation initiated by auto-ignition of the end gas. The knock intensity is thought to be decreased by suppressing the reaction rate of auto-ignition. In this study, the effect of the mixture dilution which decreases the reaction rate on the knock intensity was investigated by using a spark ignition engine. In the case of low dilution, knock was observed when the auto-ignition of the end gas occurred. When the dilution ratio was over 30%, there was the condition that the knock did not occur even if the end gas auto-ignited. The combustion with low knock intensity was observed in either case that dilution gas was inert gas or air. The knock intensity was shown as a function of the maximum temperature and the maximum pressure which affected the reaction rate although the knock intensity was affected by the composition of the mixture, load, ignition timing, auto-ignition timing of the end gas and heat release quantity of the auto-ignited mixture.