Yasumasa Hasegawa

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  • Y Hasegawa
  • Kōkūbyō Gakkai zasshi. The Journal of the…
  • 1994
Effect of 6 types of mouthguards on the vibratory characteristics of the human dry mandible was investigated by means of modal analysis with the impact test method. In this study, 20 test points were established on the mandible and the modal shape and damping ratio of the vibration of the mandible itself and the mandible each attached with a mouthguard were(More)
We have investigated the transition temperature Tc(H) of superconductivity in quasi-twodimensional (Q2D) tight-binding electrons in a strong magnetic field. When the magnetic field is parallel to 2D conducting plane, Tc(H) of the Q2D superconductor is shown to increase in an oscillatory manner as the magnetic field becomes large and to reach Tc(0) in a(More)
We study theoretically the transition temperature Tc(H) of a qu asione-dimensional anisotropic superconductor in a magnetic field, which is thought to be realized in organic conductors, (TMTSF)2X. In the weak field limit, −dHc2/dT for the anisotropic singlet is shown to be √ 3 times larger than that for the anisotropic triplet in the case of attractive(More)
We study the transition temperature Tc(H) of a quasi-one-dimensional (Q1D) superconductivity which is derived from the quantum effect of an electron motion in a strong magnetic field. We calculate Tc(H) of both isotropic and anisotropic superconductivity by taking account of the optimal momentum of the Cooper pairs and the effect of higher harmonic terms(More)
Abstract. The effect of the four-spin cyclic exchange interaction at each plaquette in the S = 1/2 two-leg spin ladder is investigated at T = 0, especially focusing on the field-induced gap. The strong rung coupling approximation suggests that it yields a plateau at half of the saturation moment (m = 1/2) in the magnetization curve, which corresponds to a(More)
The quantum Hall effect in the three-dimensional anisotropic tight-binding electrons is investigated in the field-induced spin density wave phases with a magnetic field tilted to any direction. The Hall conductivity, σxy and σxz, are shown to be quantized as a function of the wave vector of FISDW, while σyz stays zero, where x is the most conducting(More)
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