著者

瀧本 昭 多田 幸生 大西 元 長浦 一義 小坂 暁夫

出版者

公益社団法人 日本冷凍空調学会

雑誌

日本冷凍空調学会論文集 (ISSN:13444905)

巻号頁・発行日

vol.29, no.1, pp.23-30, 2012-03-31 (Released:2013-03-31)

参考文献数

4

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The development of a gas clean technology may be one of the most expecting techniques in a wide field from global environment to living conditions. In this paper, the authors proposed the new concept of a gas clean technology by utilizing negative air ions and ozone gas with the formation of mist. A system is composed of the heat exchanger of staggered fins and a electrostatic precipitator. The negative air ions and ozone gas generated by corona discharge provide an electric charge and bactericidal effects. Formation of the mist in the field of super-saturation state by cooling of the system can make them high efficiency. Experimental data showed that the present system allowed air to be sanitized in high efficiency.

著者

瀧本 昭夫 増田 芳則 小田 直樹 吉松 敦宏

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A編 (ISSN:03875008)

巻号頁・発行日

vol.54, no.508, pp.2135-2142, 1988

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Fracture tests of unsaturated polyester resin on large, single-edge notched-bend specimens were conducted under static and dynamic bend tests at room temperature. The velocity of a loading point in the three-point bending was changed from 8.3&times;10<SUP>-6</SUP>mm/s to 7&times;10<SUP>5</SUP> times its value. The two types of fracture marks of the both-ends-closed mark (like ellipses) and the one-end-opened mark (like parabolas) were observed and they were expressed by the equation of fracture marks. A rocket mark, defined here, was also often observed in the dynamic bending test and was well-approximated by the equation. The experimental number, percentage, relative interference appearing distance and the calculated relative critical distance of the marks changed with the crack propagation distance and the testing speed. The velocity of a primary crack propagation was measured and approximated by a mixed-condition relation proposed by us. This change and the gammer-letter relation between the velocity and a dynamic stress intensity factor K<SUB>D</SUB> (or a dynamic strain energy release rate, S<SUB>D</SUB>) gives the latter (K<SUB>D</SUB> or S<SUB>D</SUB>) as a function of the crack propagation distance. This provides a good theoretical explanation of the above variations of fracture marks.