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- 저자 : Kelemen, Gá (검색결과 2 건)
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In-pipe micromachine locomotion via the inertial stepping principle
염영진,황한섭,Vladislav Maxim,Peter Frankovský,Michal Kelemen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
This paper discusses an in-pipe inspection micromachine intended for locomotion inside a small diameter pipe. The micromachine locomotionis based on the inertial stepping principle, which utilizes the drive force of the two-body impact. The in-pipe micromachinecontacts the pipe through the elastic bristles installed on the in-pipe machine and in two lines and crossways with respect to the micromachineaxle. The paper describes the principle of locomotion and the dynamics by which the unknown of both the parameters and therelations are experimentally identified. Based on the results, a simulation model was created, and the results of the simulations werecompared with experimental results.
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Nemestó,thy, Ná,ndor,Bakonyi, Pé,ter,Ró,zsenberszki, Tamá,s,Kumar, Gopalakrishnan,Koó,k, Lá,szló,Kelemen, Gá,bor,Kim, Sang-Hyoun,Bé,lafi-Bak Elsevier 2018 International journal of hydrogen energy Vol.43 No.41
<P><B>Abstract</B></P> <P>Lignocellulosic biofuel, in particular hydrogen gas production is governed by successful feedstock pretreatment, hydrolysis and fermentation. In these days, remarkable attention is paid to the use of ionic liquids to make the fermentable regions of lignocellulose biomass more accessible to the biocatalysts. Although these compounds have great potential for this purpose, their presence during the consecutive fermentation stage may pose a threat on process stability due to certain toxic effects. This, however, has not been specifically elaborated for dark fermentative biohydrogen generation. Hence, in this work, two common imidazolium-type ionic liquids (1-butyl-3-methylimidazolium acetate, ([bmim][Ac]) and 1-butyl-3-methylimidazolium chloride, ([bmim][Cl])) were employed in mixed culture biohydrogen fermentation to investigate the possible impacts related to their presence and concentrations. The batch assays were evaluated comparatively via the modified Gompertz-model based on the important parameters characterizing the process, namely the biohydrogen production potential, maximum biohydrogen production rate and lag-phase time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The impact of imidazolium-type ionic liquids on biohydrogen formation was tested. </LI> <LI> The batch biohydrogen production process was evaluated kinetically. </LI> <LI> Both [bmim][Ac] and [bmim][Cl] affected the biohydrogen formation performance. </LI> <LI> The anion part of ionic liquids ([Ac]<SUP>-</SUP> vs. [Cl]<SUP>-</SUP>) demonstrated notable effect. </LI> </UL> </P>
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