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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.
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.
E.Hiraki,H.Hattori,M.Nakaoka,T.Horiuchi,Y.Sugawara 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper presents performance and loss analysis of Auxiliary Resonant Commutation Snubber-linked (ARCS) three phase voltage source soft switching inverter which is operated under a condition of Zero Voltage Switching (ZVS). The system performances of this ARCS soft switching inverter which is controlled on optimal type I digital servo scheme are illustrated and evaluated on the basis of experimental results.<br/>
EFFECTS OF HEAT EXPOSURE ON WATER METABOLISM AND PASSAGE IN SHEEP
Katoh, K.,Buranakarl, C.,Matsunaga, N.,Lee, S.R.,Sugawara, T.,Sasaki, Y. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.2
The present experiment was carried out to investigate the effects of heat exposure on water metabolism and the passage of indigestible particles in sheep. Water intake, respiratory rate, rectal temperature and pH of ruminal fluid and urine were significantly higher (P<0.05) in the hot environment ($32\;^{\circ}C$) than in the control environment ($20\;^{\circ}C$). Urine osmolality and blood volume were increased, while glomerular filtration rate was decreased, in the hot environment. The liquid flow rate from reticulo-rumen and the excretion of indigestible particles of specific gravity 0.99 (but not 1.27 or 1.38) were increased in the hot environment. From these findings, it is suggested that an increased water intake evoked by heat exposure might affect the flow rate of digesta in sheep.
Co-Cu 과립박막의 거대자기저항 현상에 대한 조성의존성과 열처리의 영향
주승기,박주욱,고이홍의,관원귀언,등삼계안 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.11
The composition and the annealing effect on the giant magnetoresistance of Co-Cu granular films fabricated by RF sputtering were investigated by TEM and NMR analysis. The maximum MR of 17% at 4.2K could be obtained at cobalt composition of 20 at%. From the TEM and NMR analysis, it has been found that the size of cobalt particles and the composition profile near the interfaces of cobalt particles are almost invariable with increase of cobalt concentration, while the interparticle distance decreases. Therefore, it could be concluded that the interparticle distance was mainly responsible for the existence of the maximum MR with respect to the cobalt composition in this system. According to the analysis of NMR spectrum, annealing of the films sharpened the composition profile of the interface between the cobalt particles and the copper matrix, which resulted in enhancement of the GMR values.