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THE SPIN REORIENTATION AND THE MAGNETIC ANISOTROPY IN R₂Fe17-xMxCy (R=Er, Tm, M=Al, Ga)
K.Ohno,T.Urakabe,M.Agata,T.Saito,K.Shinagawa,T.Tsushima 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
In order to consider the change of the magnetic anisotropy energy by the Al or Ga substitution for Fe, spin reorientation temperature T_(SR) and Curie temperature Tc in R₂Fe_(17-x)Mx, (R=Er, Tm, M=Al, Ga) have been studied both experimentally and theoretically. As a result, T_(SR) and Tc for R₂Fe_(17-x)Al_x, shift toward higher temperature side with x (0≤x≤2.0). The ΔTc, the difference of the Tc's between Er₂Fe_(17-x)Al_x, and Tm₂Fe_(17-x)Al_x, is always about 10 K independent of Al-content. But in the case of Ga substitution, the ΔTc increases with Ga-content ; especially, the ΔTc for x=2.0 is 43 K. This value of the ΔTc is not explained by only the difference of the de Gennes fator G between Er³+ and Tm³+, but it is thought that the values of J_(ErFe) and J_(TmFe) themselves are not equal. (J_(AB): the exchange interaction between A and B.)
Hybrid Capacitors Using Organic Electrolytes
Morimoto, T.,Che, Y.,Tsushima, M. The Korean Electrochemical Society 2003 한국전기화학회지 Vol.6 No.3
Electric double-layer capacitors based on charge storage at the interface between a high surface area activated carbon electrode and an electrolyte solution are characterized by their long cycle-life and high power density in comparison with batteries. However, energy density of electric double-layer capacitors obtained at present is about 6 Wh/kg at a power density of 500W/kg which is smaller as compared with that of batteries and limits the wide spread use of the capacitors. Therefore, a new capacitor that shows larger energy density than that of electric double-layer capacitors is proposed. The new capacitor is the hybrid capacitor consisting of activated carbon cathode, carbonaceous anode and an organic electrolyte. Maximum voltage applicable to the cell is over 4.2V that is larger than that of the electric double-layer capacitor. As a result, discharged energy density on the basis of stacked volume of electrode, current collector and separator is more than 18Wh/l at a power density of 500W/l.
Asymmetry in the neutrino and anti-neutrino reactions in a nuclear medium
Cheoun, M.K.,Choi, K.S.,Kim, K.S.,Saito, K.,Kajino, T.,Tsushima, K.,Maruyama, T. North-Holland Pub. Co 2013 Physics letters: B Vol.723 No.4
We study the effect of the density-dependent axial and vector form factors on the electron-neutrino (ν<SUB>e</SUB>) and anti-neutrino (ν@?<SUB>e</SUB>) reactions for a nucleon in nuclear matter or in <SUP>12</SUP>C. The nucleon form factors in free space are presumed to be modified for a bound nucleon in a nuclear medium. We adopt the density-dependent form factors calculated by the quark-meson coupling (QMC) model, and apply them to the ν<SUB>e</SUB> and ν@?<SUB>e</SUB> induced reactions with the initial energy E=8-80 MeV. We find that the total ν<SUB>e</SUB> cross sections on <SUP>12</SUP>C as well as on a nucleon in nuclear matter are reduced by about 5% at the nuclear saturation density, ρ<SUB>0</SUB>. This reduction is caused by the modification of the nucleon structure in matter. Although the density effect for both cases is relatively small, it is comparable with the effect of Coulomb distortion on the outgoing lepton in the ν-reaction. In contrast, the density effect on the ν@?<SUB>e</SUB> reaction reduces the cross section significantly in both nuclear matter and <SUP>12</SUP>C cases, and the amount maximally becomes of about 35% around ρ<SUB>0</SUB>. Such large asymmetry in the ν<SUB>e</SUB> and ν@?<SUB>e</SUB> cross sections, which seems to be nearly independent of the target, is originated from the differences in the helicities of ν@?<SUB>e</SUB> and ν<SUB>e</SUB>. It is expected that the asymmetry influences the r-process and also the neutrino-process nucleosynthesis in core-collapse supernovae.