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S. Ohnishi,K. Kondo,S. Sato,K. Ochiai,K. Takakura,C. Konno,I. Murata 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new collimator system was constructed to produce a new collimated DT neutron beam for new integral benchmark experiments at the first target room of the Fusion Neutronics Source facility in Japan Atomic Energy Agency. The collimator system had been designed and optimized with a neutron transport calculation code and the performance of the collimated DT neutron beam was tested with an imaging plate, activation foil and a scintillation counter. The DT neutron flux at the exit of the collimator hole was 2.22 × 10^6 cm^(-2)s^(-1), which was 239 times as large as that at the 2 cm off-centered position. It was confirmed that the new DT neutron beam had a good performance as expected.
Sung, M.,Chubachi, H.,Sato, R.,Shin, M. K.,Kwon, S. K.,Pu, Y. J.,Kim, Y. H. Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.5
<P>New deep blue emitters containing an sp(3)-hybridised tetrahedral silicon core with dimethyl groups, 9,10-biarylanthracene, and pyrene were synthesised. The pyrene group, with planar pi-conjugation and a slightly larger energy gap than that of anthracene, is expected to work as an intramolecular host group in organic light emitting diodes (OLEDs). Density functional theory (DFT-B3LYP) and time-dependent DFT calculations for molecular orbitals and excited states of pyrene and anthracene units showed the possibility of intramolecular energy transfer and a triplet-triplet annihilation (TTA) process. The maximum external quantum efficiencies (EQEs) of non-doped devices using PA1N and PA2N were 4.7% and 4.8%, respectively, while the maximum EQEs of doped devices using PA1N and PA2N as dopants (3 wt%) were 4.5% and 3.6%, respectively. The EQE of the non-doped device with a low photoluminescence quantum yield (PLQY) (14%) was higher than that of the doped device with a high PLQY (74%), which resulted from the existence of a contribution reproducing radiative S-1 excitons from nonradiative T-1 excitons in the non-doped devices. Both non-doped and doped devices using PA1N and PA2N showed high color pure blue emission. [ Commission Internationale de l'Eclairage coordinates, CIE (x,y), of the non-doped device were (0.16,0.08) for PA1N and (0.15,0.10) for PA2N.]</P>
The role of system Xc<sup>-</sup> in methamphetamine-induced dopaminergic neurotoxicity in mice
Dang, D.K.,Shin, E.J.,Tran, H.Q.,Kim, D.J.,Jeong, J.H.,Jang, C.G.,Nah, S.Y.,Sato, H.,Nabeshima, T.,Yoneda, Y.,Kim, H.C. Pergamon Press 2017 Neurochemistry International Vol.108 No.-
The cystine/glutamate antiporter (system Xc<SUP>-</SUP>, Sxc) transports cystine into cell in exchange for glutamate. Since xCT is a specific subunit of Sxc, we employed xCT knockout mice and investigated whether this antiporter affected methamphetamine (MA)-induced dopaminergic neurotoxicity. MA treatment significantly increased striatal oxidative burdens in wild type mice. xCT inhibitor [i.e., S-4-carboxy-phenylglycine (CPG), sulfasalazine] or an xCT knockout significantly protected against these oxidative burdens. MA-induced increases in Iba-1 expression and Iba-1-labeled microglial immunoreactivity (Iba-1-IR) were significantly attenuated by CPG or sulfasalazine administration or xCT knockout. CPG or sulfasalazine significantly attenuated MA-induced TUNEL-positive cell populations in the striatum of Taconic ICR mice. The decrease in excitatory amino acid transporter-2 (or glutamate transporter-1) expression and increase in glutamate release were attenuated by CPG, sulfasalazine or xCT knockout. In addition, CPG, sulfasalazine or xCT knockout significantly protected against dopaminergic loss (i.e., decreases in tyrosine hydroxylase expression and immunoreactivity, and an increase in dopamine turnover rate) induced by MA. However, CPG, sulfasalazine or xCT knockout did not significantly affect the impaired glutathione system [i.e., decrease in reduced glutathione (GSH) and increase in oxidized glutathione (GSSG)] induced by MA. Our results suggest that Sxc mediates MA-induced neurotoxicity via facilitating oxidative stress, microgliosis, proapoptosis, and glutamate-related toxicity.
Effect of swaging on Young@?s modulus of β Ti-33.6Nb-4Sn alloy
Hanada, S.,Masahashi, N.,Jung, T.K.,Miyake, M.,Sato, Y.S.,Kokawa, H. Elsevier 2014 Journal of the mechanical behavior of biomedical m Vol.32 No.-
The effect of swaging on the Young's modulus of β Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced α'' martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced α'' underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56GPa in the hot-forged/quenched rod to 44GPa in the rapidly swaged rod with a high reduction rate and to 45GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged β Ti-33.6Nb-4Sn rods were affected by stabilized α'' martensite. Low Young's modulus of 45GPa and high strength over 800MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced α'' was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
A Survey of Assistive Listening Devices for Deaf
Sato, Masayuki D.S. 檀國大學校 特殊敎育硏究所 1996 特殊敎育要求 兒童硏究 Vol.5 No.-
최근 보청기는 청각장애인 각자의 통신욕구에 적절한 적합(fitting)이 어는 정도까지 가능한 고성능 기기가 개발되어 보급되고 있다. 그러나 이러한 보청기의 근본적인 문제점은 보청기가 화자와의 거리나 주위의 소음에 의해 많은 영향을 받는다는 점이다. 이러한 문제점을 해결하기 위해 개발되어진 기기가 ALD(Assistive Listening Devices)이다. 일본에서는 청각장애인을 위한 의사소통(Communication) 기기 혹은 보청기 주변기기로서 알려져 있다. 본 연구는 일본의 ALD 현황을 개괄하고 문제점을 검토하는데 그 목적을 두었다. ALD에는 목적에 따라 개인간 의사소통을 위한 기기, 텔레비전, 라디오등의 시청을 위한 기기, 원거리 의사소통(telecommunication)을 위한 기기, 그리고 경보등의 신호용 기기로서 구분된다. 개인간 의사소통을 위한 기기에는 화자의 음성을 주위의 소음에 영향받지 않는 명료한 음성으로 청자에게 전달하기 위한 FM보청기, Direct Audio Input 등이 개발되어, 보청기와 화자간을 송환기(microphone)나 코드(code)등으로 연결하고 있다. 텔레비전, 라디오 시청을 위한 기기에는, 개인간 의사소통 기기와 마찬가지로, Direct Audio Input 등을 사용하여 텔레비전이나 라디오등과 보청기를 코드로서 접속하여 음성을 청취한다. 원거리 의사소통을 위한 기기에는 다종다양한 기기가 개발, 보급되어 있으며, 청각장애인은 각자의 통신대상이나 통신내용에 따라 이러한 기기를 적절히 사용하고 있다. 이러한 기기의 대표적인 것으로 증폭기가 내장된 청각장애인용 전화기, 팩시밀리, 휴대용 시스템, 인터넷트 등이 있다. 경보등의 신호용 기기에는 보청기를 착용하지 않거나 없는 상황을 고려하여, 자명종의 알림소리나 긴급시의 경보음 등이 촉각이나 시각에 의해 전달, 인식되도록 진동기기, 광신호기 등의 기기가 개발되어 있다. 본 연구의 결과, 이러한 ALD 활용시의 음향적인 문제, 이용효과의 평가 등이 금후의 과제로서 지적되었다.
S.Sato,S.Moisseev,M.Nakaoka 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In this paper, a full bridge edge-resonant zero voltage mode based soft-switch 109 PWM DC-DC power converter with a high frequency center tapped transformer link stage IS presented from a practical po lot of View The power MOSFETs operating as synchronous rectifier devices are Implemented 10 the rectifier center tapped stage to reduce conduction power losses and also to extend the transformer primary side power MOSFETs ZVS commutation area from the rated to zero-load without a requirement of a magnet1zing current The steady-state operation of this phase-shift PWM controlled power converter IS described In comparison with a conventional ZVS phase-shift PWM DC-DC converter using the diodes rectifier Moreover, the experimental results of the switch 109 power losses analysis are evaluated and discussed m this paper The practical effectiveness of the ZVS phase-shift PWM DC-DC power converter treated here is actually proved by using 25kW~32kHz breadboard circuit An actual efficiency of this converter is estimated in experiment and IS achieved as 97% at maximum
Observation of the decayB0→η′K*(892)0
Sato, S.,Yusa, Y.,Mohanty, G. B.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Bhardwaj, V.,Bhuyan, B.,Bonvicini, G.,Bozek, American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
INFLUENCE OF THE MIXING RATIO OF DOUBLE COMPONENTIAL FUELS ON HCCI COMBUSTION
S. SATO,S. P. KWEON,D. YAMASHITA,N. IIDA 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.3
For practical application on the HCCI engine, the solution of subjects, such as control of auto-ignition timing and avoidance of knocking, is indispensable. This study focused on the technique of controlling HCCI combustion appropriately, changing the mixture ratio of two kinds of fuel. Methane and DME/n-Butane were selected as fuels. The influences, which the mixing ratio of two fuels does to ignition timing, ignition temperature, rate of heat release and oxidation reaction process, were investigated by experiment with 4-stroke HCCI engine and numerical calculation with elementary reactions.