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Electronic state of MgB2 superconductor
S.Tajima,T.Masui,H.Uchiyama,J.W.Quilty,Yu.Eltsev,S.Lee,A.Yamamoto,H.Mori 한국물리학회 2002 Current Applied Physics Vol.2 No.4
Thanks to the high quality single crystals of MgB2, we have measured various physical properties to extract important features ofthe electronic state in this superconductor. The electron density maps calculated from a precise X-ray diraction analysis and theband dispersions determined by the angle-resolved photoemission spectroscopy demonstrate that the boron orbitals play a centraldicated in resistivity and Raman scattering spectra. Although the multi-band structure signicantly aects various normal stateproperties, no clear multi-gap feature can be observed in the Raman scattering spectra belowTc.. 2002 Elsevier Science B.V. All rights reserved.
Note: Sub-Kelvin refrigeration with dry-coolers on a rotating system
Oguri, S.,Ishitsuka, H.,Choi, J.,Kawai, M.,Tajima, O. American Institute of Physics 2014 Review of scientific instruments Vol.85 No.8
<P>We developed a cryogenic system on a rotating table that achieves sub-Kelvin conditions. The cryogenic system consists of a helium sorption cooler and a pulse tube cooler in a cryostat mounted on a rotating table. Two rotary-joint connectors for electricity and helium gas circulation enable the coolers to be operated and maintained with ease. We performed cool-down tests under a condition of continuous rotation at 20 rpm. We obtained a temperature of 0.23 K with a holding time of more than 24 h, thus complying with catalog specifications. We monitored the system's performance for four weeks; two weeks with and without rotation. A few-percent difference in conditions was observed between these two states. Most applications can tolerate such a slight difference. The technology developed is useful for various scientific applications requiring sub-Kelvin conditions on rotating platforms.</P>
Investigation of Droplet Collision Behavior Inside Two Merging Fuel Sprays for PCCI Combustion
( D. Tsuru ),( S. Kawauchi ),( R. Ishibashi ),( H. Tajima ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
Utilization of interference between two closely injected sprays is drawing concern nowadays as a possible injection strategy compromising both good atomization and sufficient penetration of the resulting merged spray. In this study, a two-needle-type injector introduced into the DWI (Direct Water Injection) system was newly proposed to be converted into a compound PCCI (Premixed Charge Compression Ignition) injector with a pilot nozzle and a main nozzle in one body. This structure enabled the separate application of injection timing and injection rate shape of both the injection nozzles in large marine engines in mind. Its two sprays begin their propagation several mm apart from each other and converge in a certain angle of 0°~50° degrees. A resulting merged spray is formed along the vector sum direction of the two sprays, but the direction of the merged spray can be temporally variable from the direction of one of the two sprays to that of the other. The visualization results of the merged spray from the compound injector revealed its unique features in the spray propagation and the mixture formation. Preliminary simulation on conventional spray models showed the spray behavior was very hard to reproduce numerically.
EFFECTS OF DIFFERENT COOLING TECHNIQUES ON DRAUGHT CAPACITY OF BUFFALO
Bunyavejchewin, P.,Kaewsomprasong, K.,Chotemethepirom, S.,Tanta-ngai, B.,Tajima, A.,Chikamune, T. Asian Australasian Association of Animal Productio 1991 Animal Bioscience Vol.4 No.2
Four male swamp buffaloes weighing $460.5{\pm}44.6kg$ were used to study the effects of different cooling techniques on draught capacity. Each animal carted an 882 kg load on the same asphalt road for one hour during four different time periods: 9:00-10:00 A.M., 10:30-11:30 A.M., 2:00-3:00 P.M. and 3:30-4:30 P.M. Simultaneously, all animals were subjected to five different treatments on five days of similar environmental conditions. In Treatment 1, animals were put stationary in a field and did no work; in Treatment 2, animals were worked without any cooling method; in Treatment 3, fifteen-minute wallow was allowed to animals prior to working; in Treatment 4, animals were covered with wetted jute bags while working, and in Treatment 5, two buckets of water were poured over the buffaloes' trunks just prior to working. The experiment was conducted from April to July 1989, when the weather was very hot. It was found that cooling methods and working times did not affect the draught efficiency of buffaloes during the one hour, but did affect physiological traits. The work load had a larger partial effect on physiological responses of buffalo other than respiration rate than did climatic variables except on the respiration rate of the buffaloes. One cooling technique that seemed to slow the increase of body temperature while working was covering the buffalo's back with wetted jute bags. Animals working at different times had significant differences in the increase of physiological traits except pulse rate.
Watanabe, K.,Tanaka, R.,Takada, K.,Kim, M. J.,Lee, J. S.,Tajima, K.,Isono, T.,Satoh, T. Royal Society of Chemistry 2016 Polymer chemistry Vol.7 No.29
<P>A comprehensive examination of the synthesis of single-chain nanoparticles (SCNPs) from statistical copolymers of n-butyl methacrylate (BMA) and 3-butenyl methacrylate (3BMA), i.e., P(BMA-co-3BMA)s, via the intramolecular olefin metathesis reaction under high dilution conditions is described. The olefin metathesis reaction of P(BMA-co-3BMA) using Grubbs' 2nd generation catalyst in CH2Cl2 efficiently gave the corresponding SCNPs under mild conditions. We achieved the size-controlled synthesis of the SCNPs by adjusting the following factors: (1) the olefin content in the precursor, (2) the molecular weight of the precursor, and (3) the solvent quality of the reaction medium. The hydrodynamic radius and the intrinsic viscosity of the resultant SCNPs were investigated by DLS and viscometric measurements, respectively, which provided further evidence of SCNP formation with controlled diameters. Furthermore, the above-established intramolecular olefin metathesis approach was successfully applied to poly(acrylate), poly(styrene), and poly(ester) precursors, which proved that the present approach could be applied to a wide range of olefin-containing precursors to give SCNPs with various functional groups.</P>