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X-ray and Neutron Structure Analysis of MeHPLN in the Low Temperature Phase
R. Kiyanagi,A. Kojima,H. Kimura,M. Watanabe,S. Kumazawa,T. Sugawara,T. Hayashide,T. Mochida,Y. Noda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Structure analyses of 5-Methyl-9-hydroxyphenalenon(C14H10O2, MeHPLN) in the low temperature phase were performed by X-ray and neutron scattering experiments. It is found that the space group is P21/c with a super cell (a 2b c) and there are two types of molecules in the unit cell. In one of the independent molecules, hydrogen atoms in hydrogen-bond region occupy two sites as same as in the room temperature phase. On the other hand, in another independent molecules, hydrogen atoms in hydrogen-bond region clearly show ordering feature. In these ordered hydrogen atoms, there are obvious discrepancy beween electron and nuclear distribution, and hence static electrical dipolemoments exist in hydorgen-bond region with an antiferroelectric ordering.
Mochida, A.,Tominaga, Y.,Murakami, S.,Yoshie, R.,Ishihara, T.,Ooka, R. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.2
Recently, the prediction of wind environment around a building using Computational Fluid Dynamics (CFD) technique comes to be carried out at the practical design stage. However, there have been very few studies which examined the accuracy of CFD prediction of flow around a high-rise building including the velocity distribution at pedestrian level. The working group for CFD prediction of wind environment around building, which consists of researchers from several universities and private companies, was organized in the Architectural Institute of Japan (AIJ) considering such a background. At the first stage of the project, the working group planned to carry out the cross comparison of CFD results of flow around a high rise building by various numerical methods, in order to clarify the major factors which affect prediction accuracy. This paper presents the results of this comparison.
Kim, T.,Ham, C.,Rhee, C.K.,Yoon, S.H.,Tsuji, M.,Mochida, I. Pergamon Press ; Elsevier Science Ltd 2009 Carbon Vol.47 No.1
Correlations between the electrochemical double layer capacitances of various acetylene blacks modified by surface oxidation and heat treatment, and their morphologies are presented. The acetylene blacks were different from each other in primary structural unit size (equivalent to mean particle diameter). They were oxidized in air at 300<SUP>o</SUP>C for 1h to produce graphene sheets protruding from the surfaces of the spherical particles. In addition, the surfaces of the acetylene blacks were modified by heat treatments from 1000<SUP>o</SUP>C to 2800<SUP>o</SUP>C, which resulted in a morphological change from surfaces covered with protruding graphene sheets to ones wrapped with basal planes of graphite. Correlations between the capacitances of the acetylene blacks and the observed morphologies showed that the surface covered with protruding graphene sheets was roughly 10 times more effective in capacitive charging than the surface of graphite basal planes. Specifically, the surface specific capacitance of the edged-graphene-sheet-covering surface was 146mF/m<SUP>2</SUP>, while that of the basal-planes-wrapping surface was 16mF/m<SUP>2</SUP>. It was concluded that the capacitances of the acetylene blacks were mainly defined by surface morphology, which were in turn influenced by structural unit size and degree of oxidation.
Structure Study of BrHPLN by X-ray and Neutron diffraction
R. Kiyanagi,H. Kimura,M. Watanabe,T. Mochida,T. Sugawara,Y. Noda 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
An antiferroelectric material with an isolated hydrogen bond, 5-bromo-9-hydroxyphenalenon, was structurally investigated by means of X-ray and neutron-diffraction methods at room temperature. It was found that the electron of the hydrogen atom in the hydrogen-bond region is in a disordered state, having three sites around the center of the hydrogen bond. We also found an obvious discrepancy between the electron density distribution and the nuclear density distribution. That is, the center of the electron cloud of the hydrogen atom is o set from the nuclear position. This result, together with the disordered feature, leads to a local disordered electronic dipole moment in the hydrogen-bond region, which is consistent with the result for 5-methyl-9-hydroxyphenalenon in its room-temperature phase.
Deep desulfurization of gas oil over NiMoS catalysts supported on alumina coated USY-zeolite
Nakano, K.,Ali, S.A.,Kim, H.J.,Kim, T.,Alhooshani, K.,Park, J.I.,Mochida, I. Elsevier Scientific Pub. Co 2013 Fuel processing technology Vol.116 No.-
A series of NiMoS catalysts supported on USY-zeolite coated with different amounts of alumina were prepared and evaluated for deep hydrodesulfurization (HDS) of gas oil using a flow reactor system in single- and dual-bed configurations. The performance of these catalysts was compared to the conventional HDS catalyst as well as to NiMoS catalyst supported on physical mixture of alumina and USY-zeolite. Physically mixed alumina and USY zeolite showed high HDS activity, but it was accompanied with significant cracking of hydrocarbons. Activity and kinetic analysis showed that heavy coating of alumina on the zeolite resulted in much lower HDS and cracking activity. On the other hand, very light coating of alumina on the zeolite resulted in catalytic behavior similar to that of physical mixture of USY-zeolite and alumina. The general trend was an increase in HDS as well as hydrocracking activity with the decrease in amount of alumina coating over zeolite. Changes in product density, aromatic content, mid-boiling point, cetane index, and molecular weight also reflected this trend. The results of this study indicate that catalysts with neither too low nor too high amount of alumina coating on the USY zeolite are suitable to achieve the balance between high HDS and low cracking activities. The highlight of the present study is that it confirmed the deep HDS activity of USY containing alumina supports in the flow reactor system which is industrially applied. In addition, the stability test confirmed the long-term performance of alumina-coated zeolite catalyst.