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K.Shinohara,Y.Minari,T.Irisa 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
The voltage source inverter without dc link components does not have electrolytic capacitor and reactor (or resistor). The main circuit consists of inverter,rectifier and ac filter. The rectifier is the three phase bridge connections of 120° duration, and each diode has the antiparallel connected GTO for the reverse current flow path. This paper describes the analytical method and the calculated results on the stability of this system. The dc link voltage of the inverter takes immediately the influence of the ac source voltages. The stability analysis is performed by means of state variable method in consideration of the ac source voltages. In the equation of the small perturbations on the state variable from steady state, the stability is estimated by the dominant root in eigenvalues analysis. The stable and unstable characteristics with constant V/f control of induction motor are similar to the conventional voltage source inverter.<br/>
STEADY-STATE ANALYSIS OF PERMANENT-MAGNET AC SERVO MOTOR DRIVEN BY CURRENT-CONTROLLED PWM INVERTER
K.Shinohara,K.Yamamoto 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
In this paper,vector control of per-aanent-magnet ac servo motor with surface-mounted maagnets is discussed. A current conrol system is the Host important element for a high-performance adjustable-speed control system. It is important to consider how fast current control-both magnitude and phase-can be achieved. One of the current control systems that are used now is control method with average value. The equations of propotional-integral control circuit are converted to those of the synchronously rotating frame, to adapt the fundamental equ. of a permanent-magnet ac servo motor. A method of exact numerical analysis by the state variable method is proposed. Norminal induced emf(e0) is compensated for a change for the worse of the current control that is problem in high speed operation. The experimental results of the nominal induced emf compensation are confirmed, and the experimental results are compared with those of analysis. Moreover, compensation of internal emf(ea) is analyzed, and the results of the analysis are compared with those of analysis that a case of only nominal induced emf compensation.<br/>
H. SHINOHARA,P. RAMESH,K. SATO,Y. OZEKI,N. KISHI,T. SUGAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.1
Experimental conditions that govern the double-wall carbon nanotube (DWNT) growth during alcohol catalytic chemical vapor deposition (CCVD) have been optimized for mesoporous silica (MCM41) support materials. Catalyst pretreatment and preparation methods influence the quality of as-grown carbon nanotubes (CNTs). Catalyst pretreatment at low pressure leads to high-quality CNTs concomitant with an increase in the DWNT yield. Impregnation of metal precursors using methanol as the solvent is found to be more suitable than the aqueous solution. Influence of the precursor anion/metal ion on the DWNT yield is also studied under these optimized conditions. Thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and Raman spectroscopic methods have been employed to estimate the quality of the CNTs. It is observed that the present optimized method yields high-quality DWNTs with low amounts of side-wall defects and other carbon impurities.
Hisatake, H.,Matsubara, I.,Maeda, K.,Yasuoka, H.,Mazaki, H.,Shinohara, H.,Takahashi, M. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.1
We observed the photoinduced irreversible change of complex permeability and an additional remarkable disaccommodation of magnetic permeability (DA) of single crystalline samples of yttrium iron garnet(YIG) below room temperature. One of the most interesting characteristics of these phenomena is the appearance of metastability in these properties at low temperatures, $T{\leq}250K$. These results are interpreted within the context of configuration coordinate(CC) diagrams with large lattice relaxations.
Measurement of High Energy Neutron Induced Cross Sections for Chromium
S. Sekimoto,T. Utsunomiya,H. Yashima,H. Joto,S. Shibata,K. Ninomiya,D. Satoh,Y. Iwamoto,T. Omoto,R. Nakagaki,N. Takahashi,A. Shinohara,T. Shima,M. Hagiwara,H. Matsumura,K. Nishiizumi,Y. Matsushi,H. Ma 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Reaction cross sections for Cr induced by neutrons at 287 MeV were measured by using ^7Li(p,n) reaction at N0 beam line in the Research Center for Nuclear Physics (RCNP), Osaka University. To estimate quasi-monoenergetic neutron-induced cross sections, the Cr sample was irradiated on the two angles of 0° and 30° for the axis of the primary proton beam. Proton-induced reaction cross sections for Cr at 300 MeV were also measured. The measured cross section data in the ^(nat)Cr(n,x) and ^(nat)Cr(p,x) reactions are compared with the literature values and the JENDL high-energy file. Furthermore, those in the ^(nat)Cr(n,x) reactions are also compared with those in the ^(nat)Cr(p,x) reaction.
Accumulated 2-D neutron flux distribution during KSTAR operation
Kwak, Jong-Gu,Lee, Y.S.,Lee, D.R.,Kim, C.S.,Kim, H.S.,Lee, H.J.,Shinohara, K. Elsevier 2018 Fusion engineering and design Vol.136 No.1
<P><B>Abstract</B></P> <P>Since the successful first H-mode in 2010, duration of H-mode is extended to 1 min and the highest stored plasma energy up to 0.6 MJ is obtained by developing hybrid and internal transport barrier (ITB) mode as well as typical H-mode. Major heating system is the neutral beam (NB) of 100 keV with 5.5 MW and it is planned that the new additional 6 MW NBI is installed in 2018. So there is a lot of production of fast neutrons coming from via D(d,n)<SUP>3</SUP>He reaction and it is found that most of neutrons are 2.45 MeV neutrons coming from deuterium beam plasma interaction and the total neutron fluence during a campaign could be estimated to be about 10<SUP>19</SUP>. In particular, several nickel activation samples are installed inside/outside the vacuum vessel poloidally and toroidally and the total accumulated neutron flux is estimated from 811 keV gamma emission measurement after the campaign. The results show that the neutron activation both inside and outside the vacuum vessel has toroidally non-axisymmetric distribution and it has the highest neutron flux around poloidal limiter area. Considering the prompt ion loss at nominal KSTAR operation including the high beta-p operation, prompt loss ions from 100 keV neutral ion beams hitting on three poloidal limiters was not negligible and the non-uniform distribution is discussed in term of prompt ion loss to the poloidal limiter. In addition, this work reports on the quantitative analysis of poloidal distribution of the neutron emission based on accumulated flux measurements.</P>