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Demulsification of O/W Emulsion and Subsequent Water Treatment Using Powder Adsorbent
Yasushi Takeuchi,Lee, Sung Sik,Mitsuhiro Nakamura 한국화학공학회 1989 NICE Vol.7 No.2
Demulsification of stable oil-in-water emulsion was studied using powder adsorbent. Among various adsorbents tested, activated carbon was found to be the most efficient regardless of the type of surfactants used. The more dose of activated carbon for the demulsification was required, the higher concentration of the surfactant as well as the larger amount of oil and the bigger size of the lipophilic and hydrophilic groups. Empirical equations were obtained to correlate the dose of activated carbon to the residual concentration of oil as a function of the initial concentration of surfactant.
Articles : Removal of Nitrogen Oxides from Air by chemicals-Impregnated carbons
( Yasushi Takeuchi ),( Kohjiro Yanagisawa ),( Yuhsuke Tanaka ),( Noriyuki Tsuruoka ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.5
Fixation of nitrogen oxides (NO_x) in air onto granular activated carbon impregnated with chemicals was attempted to improve removal efficiency of NO_x by activated carbon adsorption. Nitric oxide (NO) and nitrogen dioxide (NO₂), were tried to remove by a flow test. Fixed-bed adsorption breakthrough curves were obtained when some kinds of carbon were used. The amount adsorbed of NO₂changed with the amount and kinds of metallic salts impregnated. Chemicals-impregnated carbons were prepared from a commercial activated carbon. Among obtained carbons, the one which showed the highest selectivity for NO_x was chosen, and its performance with the change in humidity was determined. Removal mechanism of NO₂was estimated, and the carbon impregnated with potassium hydroxide was found to be superior to any other carbon tested. The amount of the adsorbed NO and that produced by the reduction of NO₂were determined from the breakthrough curves.
Housing Estates as Experimental Fields of Social Research
Yasushi Sukenari 서울대학교 사회발전연구소 2016 Journal of Asian Sociology Vol.45 No.1
This paper discusses researchers’ relationships with their research object and its transformation in empirical sociology by examining “danchi” (housing estates) studies conducted by Japanese sociologists. The Japanese housing policy system was quickly established in the early 1950s, and the reinforced concrete housing complexes stimulated journalistic interest. Most influential researchers in postwar Japanese sociology launched into research on these newly constructed housing estates. One reason was that social surveys with standardized questionnaires to individual respondents were compatible with the new housing form. Danchi became experimental fields of social research. Some early researchers emphasized the sparsity of neighbor relationships in danchi and the surviving kinship across geographical boundaries. However, the image of danchi as pictured by sociologists transformed around 1960. Studies of residents’ associations showed that danchi communities were being formed through cooperative solutions found for residents’ common problems. Whether or not a housing estate was formed as a community depended on how the residents related to the space. This change was also reflected in the relationships between the researchers and the respondents in that the distance between them under the standardized attitude and opinion survey was lost. The change in the image of housing estates in the 1960s can be said to overlap with a turning point in social research.
( Yasushi Matsufuji ),( Ayako Tachifuji ),( Makiko Tanaka ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
최근에 소각장은 다이옥신 최소배출가스를 고비용으로 처리하고 있다. 그러므로 지방정부는 플라스틱 소각장 대신에 경제적인 또한 안전한 처리체계가 필요하다. 이 연구는 생분해 플라스틱을 포함한 도시고형폐기물을 플라스틱에서 생분해플라스틱(BP)으로 대부분 전환한 후 매립지로 처분한 경우 이것의 해결책과 문제를 제기한다. 이 결과로부터 (1)BP의 증가로 매립지의 오염부하 (2) 이문제는 준호기성 매립형태와 예를들면 PLA로서 BP 가스화로서 해결한다. Recently, the incineration plant was integrated to satisfy the limit levels of Dioxins in emission and get more expensive. Therefore local government needs an economical and safety treatment system instead of incinerating waste plastics. This study provides the problems and its solutions in case that municipal solid waste including biodegradable plastics (BP) was disposed of in landfill after converting most of plastics to BP. From this result, it was clarified (i) the pollutant load in landfill increase by receiving BP, (ii) this problem is solved by selecting the semiaerobic landfill type and BP with high in gasification rate such as PLA.
Degradation of Microstructured InN Films During Adsorption-induced Electrochromism
Yasushi Inoue,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Indium-nitride films with isolated-nanocolumnar structure synthesized by glancing-angle reactive ion plating have been investigated for the degradation properties induced by cyclic electrochromic reaction. We found two types of degradation behavior due to abration and reduction of the indium-nitride layer.