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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.
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.
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/>