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Effect of Cr-Rich Phase Precipitation on Magnetic and Mechanical Properties of Fe-20% Cr Alloy
Mohapatra, J. N.,Kamada, Y.,Kikuchi, H.,Kobayashi, S.,Echigoya, J.,Park, D. G.,Cheong, Y. M. IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>Magnetic Hysteresis Loop (MHL) and micro-Vickers hardness measurements were carried out in isothermal aged Fe-20 wt. % Cr alloy. The results were compared with the existing atom probe data at similar heat treated conditions. Coercivity and hardness of the alloy was increased and remanence of the alloy was decreased with the increase in ageing time. Such increase in the magnetic and mechanical hardness was due to the nucleation and growth of Cr rich α' phase. The size of the Cr rich α' phase precipitates were increased and the number density of the precipitates were decreased with the increase in ageing time observed by atom probe analysis. In this work a good correlation between hardness (H<SUB>v</SUB>) and coercivity (H<SUB>c</SUB>) was found with the combined effect of precipitate size (r) and number density (n). A linear relationship was found with the change in coercivity and hardness of the alloy indicating that the MHL technique would be a good Non-Destructive Evaluation (NDE) tool for the evaluation of thermal embrittlement in structural components made of Fe-Cr alloys.</P>
Search for the H Dibaryon in (K-, K+) Reactions
Bahk,S. Y.,Chung,K. S,Chung,S. H.,Funahashi,H.,Hahn,C. H.,Hara,T.,Hirata,S.,Hoshino,K.,Ieiri,M.,Iijima,T.,Imai,K.,Ishigami,T.,Itow,Y.,Kazuno,M.,Kikuchi,K.,Kim,C. O.,Kim,D. C.,Kim,J. Y.,Kobayashi,M.,Ko 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied(??) reactions from an emulsion target. The S--2H dibaryon has been searched for by the analysis of the ??? momentum spectrum together with emulsion data. No evidence of H production was observed in the mass range of 1.90-2.16 GeV/c². Upper limits for the production cross section of the H are (0.2-0.6)% of that for the quasifree ??? production at the 90% confidence level.
Motion Control of Linear Pulse Motor for Artificial Heart
H.Yamada,T.Mizuno,Y.Izumi,H.Wakiwaka,Y.Kataoka,Y.Kikuchi 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper deals with the difference of the static and kinetic thrust characteristics of a linear pulse motor (LPM) without and with feedback control for a total artificial heart (TAH). In general, the kinetic thrust of a LPM without feedback control decreases as increasing the mover velocity. The kinetic thrust characteristics of the LPM with feedback control are improved approximately 30 % as compared with the LPM without feedback control in the high velocity range.<br/>
Lee, J.H.,Kim, C.H.,Han, Y.-G.,Lee, S.B.,Nagashima, T.,Hasegawa, T.,Ohara, S.,Sugimoto, N.,Kikuchi, K. IEE 2006 Electronics letters Vol.42 No.5
The implementation of a stimulated Brillouin scattering (SBS) free, optical fibre phase conjugator by use of only 1 m length of fabricated bismuth oxide-based nonlinear fibre (Bi-NLF), has been experimentally demonstrated. A high OSNR phase-conjugated signal was readily achieved owing to the unique properties of the Bi-NLF such as an ultra-high χ<SUP>(3)</SUP> nonlinearity and a high SBS threshold although no SBS suppression scheme was employed. Using the phase conjugator, error-free transmission of the signal is readily achieved over a 150 km SMF link.
광학활성 이소로이신을 출발물질로 한 강유전성 액정물질의 합성
정노희,기쿠치,카지야마 ( N,H . Jeong,H . Kikuchi,T . Kajiyama ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.3
A new one seies of chiral schiffs base containing benzylidene aniline moieties was synthesized and characterized by IR, ^1H NMR. elementary analysis, and polarized optical microscopy(POM). The yield of these synthetic compounds was in the range of 62~67℃. The results showed that most of the synthetic compounds were monotropic liquid crystal and exhibited chiral smectic C(Sc^*) liquid crystal phases, and the range of phase transition temperature was to 71.4℃ from 45.0℃.
Kim, J.K.,Han, S.H.,Kim, C.H.,Jo, Y.H.,Futahashi, R.,Kikuchi, Y.,Fukatsu, T.,Lee, B.L. Pergamon Press ; Elsevier Science 2014 DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY Vol.43 No.1
The majority of insects possess symbiotic bacteria. Since symbiont titers can affect host phenotypes of biological importance, host insects are expected to evolve some mechanisms for regulating symbiont population. Here we report that, in the Riptortus-Burkholderia gut symbiosis, titers of the beneficial symbiont transiently decrease at the pre-molt stages in host development. This molting-associated suppression of the symbiont population is coincident with the increase of antimicrobial activity in the symbiotic midgut, which is observed in both symbiotic and aposymbiotic insects. Two genes, pyrrhocoricin-like antimicrobial peptide and c-type lysozyme, exhibit significantly increased expression in the symbiotic midgut at the pre-molt stages. These results suggest that the molting-associated up-regulation of antimicrobial activity in the symbiotic midgut represents a physiological mechanism of the host insect to regulate symbiosis, which is presumably for defending molting insects against injury and infection and/or for allocating symbiont-derived energy and resources to host molting.