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RISS 인기검색어
- 검색키워드
- 저자 : Wang Jinchang (검색결과 3 건)
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Zhang, Jinchang,Wang, Yanhui,Ma, Runyu,Wu, Diyong 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
A series of nickel and nickel-palladium supported upon alumina catalysts were prepared in order to obtain a suitable catalyst that could be used in the process of producing hydrogen by partial oxidation and steam reforming of n-octane. Hydrogen production by partial oxidation and steam reforming(POSR) of n-octane was investigated over alumina-supported Ni and Ni-Pd catalysts. The process occurred by a combination of exothermic partial oxidation and endothermic steam reforming of n-octane. It was found that Ni/AI_2O_3 catalyst activity was high at high temperatures and increased with the Ni loadings. Its activity, however, was not obviously increased when Ni loadings were over 5.0 wt%. Compared with nickel catalyst, the bimetallic catalyst of Ni-Pd/AI_2O_3 showed markedly increased activity and hydrogen selectivity at experimental conditions. The catalytic performance also became more stable when the palladium was added, which indicated that palladium plays an essential role in the catalytic action. The used catalysts of Ni-Pd/AI_2O_3 were regenerated three times by using air at space velocity of 2.000h^-1 to obtain a long duration catalyst. Also, the typical catalyst was characterized by using SEM, BET, TG and ICP methods in detail.
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Shuang Wang,Jiansheng Chen,Jinchang Sheng,Yulong Luo 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.4
Cut-off walls have been widely used to control seepage in dams and their foundations for over 100 years. The soil at the bottom of a cut-off wall is usually under complex stress and composed of various particles with different contents. In this study, the effects of the stress state and grain composition on the evolution of internal erosion were investigated in sandy gravel foundations containing a suspended cut-off wall. The following observations were made based on the experimental results: (1) The fine-particle content of the soil sample considerably influences the evolution of internal erosion. For high fine-particle content, particles are likely to clog under the downward flow; however, for low fine-particle content, the downward flow assists the migration of fine particles. (2) Deviatoric stress considerably influences the soil structure. The soil sample is compressed under low deviatoric stress; however, it undergoes dilatancy under high deviatoric stress. (3) Dilatant behavior is also controlled by confining stress. The higher the confining stress, the higher is the deviatoric stress applied on the soil sample, which produces dilatancy, and the smaller is the volumetric expansion. The obtained results will enhance the understanding of the progression mechanism of internal erosion around suspended cut-off walls.
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Chen Junhui,Liu Yangqing,Ma Guangqiang,Yang Feiying,Zhan Zhigao,Guan Limei,Kuang Wendong,Wang Jinchang,Li Jianghuai,Han Fei,Jin Liang 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
Mosquitoes bite human beings and transmit many diseases, such as malaria, dengue fever, and Zika virus. Vector control of mosquitoes is an effective strategy for reducing the spread of disease. However, extensive use of in secticides (e.g. pyrethroids and organophosphorus) has caused resistance in mosquitoes, which weakens the effectiveness of mosquito control. Phytochemicals have been considered an alternative approach to mosquito control. Essential oil (EO) was obtained from the leaves and flowers of Origanum vulgare, and its synergistic activity with piperonyl butoxide (PBO) was tested against Aedes albopictus and Culex pipiens quinquefasciatus larvae. Thirty-seven compounds were identified, among which carvacrol and thymol were two major constitu ents (30.73 % and 18.81 %, respectively). O. vulgare EO had a significant toxic effect against fourth-stage larvae of Cx. p. quinquefasciatus and Ae. albopictus, with LC 50 values of 17.51 and 75.90 mg/L. Carvacrol and thymol also each appeared to be more effective against Cx. p. quinquefasciatus (LC 50 = 19.30 and 11.56 mg/L, respectively) than Ae. albopictus (LC 50 = 26.62 and 26.66 mg/L, respectively). PBO interacted synergistically with O. vulgare EO, carvacrol and thymol with 2.60–6.26 times as much of the active compound needed without PBO as against Cx. p. quinquefasciatus and Ae. albopictus larvae. Overall, our results contribute to the development of new natural mosquito insecticides.
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