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Impulse Creeping Streamer and Propagation Velocity in Vegetable and Mineral Oils with Pressboard Interface

Journal of Energy and Power Engineering 2018年第7期12卷 346-355页

作者： Ryoichi Hanaoka Katsunori Miyagi Yoji Fujita Kiyoshi Takamoto seiichi nishikawa Yoshiyuki Oura Kanazawa Institute of Technology 7-1 OhgigaokaNonoichiIshikawa 921-8501Japan Kanden Engineering Corporation 3-1-176 FukuzakiMinato-kuOsaka 552-0013Japan

This paper presents an experimental study on the creeping discharge propagating over the pressboard surface in two vegetable oils(PFAE(palm fatty acid ester)oil and CRS(crude rapeseed)oil)and commercial mineral oil under the quasi-square impulse voltage with any pulse *** pressboard impregnated with the sample oil is immersed completely into the same *** tungsten needle electrode is installed in the pressboard surface with and without the counter electrode to generate a creeping *** other side of pressboard has the thin copper rod as a back side electrode.A comparison of the shape and stopping length of positive and negative streamers,discharge current,emitted light signal,and temporal variation and velocity of streamer propagation is reported for all different oil-pressboard *** has been shown that the behavior of creeping streamers has unique characteristics and polarity effects,and the traveling mode and propagation velocity of streamers are greatly different depending on the type of oil.

关键词： Creeping streamer stopping length propagation velocity quasi-square impulse voltage PFAE oil CRS oil mineral oil

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Simple Detection Method of Biogenic Amines in Decomposed Fish by Intramolecular Excimer Fluorescence

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Food and Nutrition Sciences 2012年第7期3卷 1020-1026页

作者： Hirofumi nishikawa Tatsuya Tabata seiichi Kitani Health Service Center Tokyo University of Marine Science and Technology Konan Japan

Biogenic amines are known to have various biological functions such as not only neurotransmitter and cell proliferation but also food poisoning. Bacterially-decomposed amines such as histamine, agmatine, putrescine, cadaverine, spermidine and spermine cause allergic symptoms. We developed simple method for measurement of polyamine as indicator of food decomposition with a fluorometer by using 4-(1-Pyrene)butyric acid N-hydroxysuccinimide ester (PSE). PSE reacts with primary and secondary amino moieties of polyamines and produces the intramolecular excimer fluorescence. Excimer fluorescence with broad peak at around 470 nm was clearly detected in linear type biogenic amines such as putrescine, cadaverine, spermidine and spermine at 10 mM. However neither histamine nor trimethylamine altered the fluorescence. Decomposed sardine and mackerel by improper storage showed stronger intensity than fresh ones. Comparing with OPA-method, PSE method was useful for screening biogenic amines present in food, esp. fish since the analysis was simple after one-step purification procedure. An inexpensive system which can rapidly detect biogenic amines from food is necessary in a medium and small-sized food business. The technique using excimer has potential to realize the high through-put screening system for evaluation of food freshness and is expected to bring the public interests such as food security and safety of consumer.

关键词： 4-(1-Pyrene)Butyric acid N-Hydroxysuccinimide Ester PSE Excimer Fluorescence Biogenic Amine Fish Decomposition Polyamine Food Poisoning

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