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Laser-induced spark ignition of H_2/O_2/Ar mixtures

Science China(Technological Sciences) 2007年第6期50卷 797-806页

作者： WANG ChangJian XU ShengLi JIA GuangMing Department of Mechanics and Mechanical Engineering University of Science and Technology of China Hefei 230026 China Department of Mechanics and Mechanical Engineering University of Science and Technology of China Hefei 230026 China Department of Mechanics and Mechanical Engineering University of Science and Technology of China Hefei 230026 China

Laser-induced spark ignition of hydrogen-oxygen-argon mixtures was experimen- tally investigated using a Q-swiched Nd:YAG laser to break down the gas at 532 nm. The laser-based high-speed schlieren system was employed to record flame front evolution for the gas mixtures with different initial pressure or laser output energy or argon dilution. The results show that the breakdown of the gas leads to the generation of ellipsoidal plasma. The rarefaction waves create the toroidal rings at the leading and trailing edges of the plasma, which provides a reasonable explana- tion for inward wrinkle of the plasma and the resultant flame. The toroidal rings at leading edge decays more rapidly and a gas lobe is generated that moves towards the laser. The hot gas in the plasma induces the generation of the spark kernel. Affected by the very weak shock wave or compression waves reflected off the wall, the initial laminar flame decelerates. The arc flame front interactions with the wall, reversed shock wave or compression waves, rarefaction waves, etc. induce the transition from laminar flame to turbulent one. These induce the transition from laminar flame to turbulent flame. For stoichiometric hydrogen-oxygen mixtures diluted by 76.92% argon at an initial pressure of 53.33 kPa, the minimum output energy of the laser is 15 mJ for successful laser-induced spark ignition. With in- creasing initial pressure or the output energy of the laser, or decreasing argon di- lution, the speed of the flame front increases.

关键词： laser-induced spark ignition, high-speed schlieren photography, plasma, rarefaction waves, laminar flame,turbulent fame

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Is Seeing Believing？A Critical Analysis of Japanese Colonial Photographs of Korea

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Journal of Literature and Art Studies 2017年第6期7卷 722-747页

作者： Sunglim Kim Dartmouth College Hanover United States

In order to assess Roland Barthes＇ argument that interpretation of photography depends on cultural codes embeddedtherein, a collection of photos from the Japanese Government-General of Ch6sen （GGC）, which controlled Korea1910-1945, were examined. These colonial images and associated text, commonly in English, were aimed primarilyat the West, with which the Japanese sought alignment. Of the three common categories of GGC photos, ＂scientific＂or ＂anthropological＂ images corresponded with portrayals by Western colonial powers of the supposed inferiornature of subjugated peoples and cultures. Individuals in such pictures tend to lose their identities and are reducedto a stereotype, less human than the observer. ＂Before and after＂ photos depicted alleged GGC progress in suchareas as education and infrastructure. Pictures of ＂happy colonial subjects＂ conveyed an impression of Koreansenjoying the benevolence of the new administration. While this photojournalism favorably impressed someWesterners, others employed images of the 1919 Korean uprising, and its suppression, to discredit the *** overall assessment demonstrates the polemical manipulation of photography.

关键词： Anthropology, Coding, Colonialism, Japan, Korea, photography, Photojournalism, Polemics

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