A simple derivation of the field theory of Ising quantum chain shows that the Ising model is equivalent to the free Majorana real spinor field. At the critical point, the field equation is conformally covariant.

¹³¹Xe nuclear spin relaxation rate as a function of cell temperature and buffer gas pressure has been measured by Faraday rotation method. Experimental results show that spin exchange rate of ¹³¹Xe with ⁸⁷Rb is C = 1.68 x 10^-21 m³s^-1, Breit-Rabi parameter is X=4.4, and rate constant for three body formation of Van der Waals molecules is Z=5.1x 10^-44m⁶ s^-1.

An optical field induced circular birefringence due to collision-induced Zee-man coherence in Sm with He has been observed. The integrated intensity and linewidth of the signal have been measured as a linear function of buffer gas pressure. The cross section for destruction of orientation in the ground state of Sm with He has been obtained.

We report the operation of a β- BaB₂O₄ (BBO) optical parametric oscillator (OPO) broadly tunable in the visible and the near infrared. Quantum efficiency of 22.7% for the signal and 34.1% for the idler corresponding to the total energy conversion efficiency of 25.9% has been achieved. The maximum average output power and the maximum output energy reached 220m W and 22rnJ/pulse, respectively. By changing the matching angle of the OPO, the output wavelength was continuously scanned throughout 425-2144nm.

The method of multiple-scales is used to investigate the nonlinear modulation of capillary-gravity waves with cylindrical symmetry. We find that the evolution of wave-packets is described by a nonlinear schrödinger-like equation i(U + U/2r) + αU_ξξ + β|U|²U = 0. Some exact and explicit cylindrical envelope solitary wave solutions are also obtained by means of variable transformations.

This study presents a procedure for solving semi-infinite crack which is a very useful model in geophysics, seismology and engineering. With the help of conformal transformation mapping. the region in a physical plane onto the interior of a unit circle in a plane, any case of this kind of problems can be solved unifiedly, and some exact solutions are obtained.

The expression of Wu’s hydrodynamic soliton in a sloping trough was derived wing the perturbation method of multiple scales. It showed that the soliton slowly moves toward the shallow end with uniform acceleration, which is consistent with Wu’s experiment.

The trajectory of charge particles will be changed by electrostatic wave with a large amplitude in plasma. The dispersion relation of drift waves is derived with the help of integration along the changed trajectory. It shows that the drift wave instability can be suppressed by so-called “quasi-Larmor radius effect” as long as the condition, K . S_e > K . S_i, is satisfied, where K is the wave number of drift wave, S_e and S_i are the amplitudes of shift of electrons and ions, respectively.

The optical quality Pb_1-xBa_xNb₂O₆ single crystals have been grown by Czochraski method from the melt. Their structure, dielectric, ferroelectric properties were studied. Transmission spectra, two-wave maxing properties were measured. This crystal will be an available material for photorefractive applications.

Neutron transmutation doping (NTD) effect in hydrogenated amorphous silicon (a-Si:H) has been reexamined. There is no increase of both dark and photoconductivity of neutron irradiated a-Si:H after annealing at 180°C or 240°C . Our experimental results support Burnett et al. who contradict the finding that NTD in a-Si:H is effective by Hamanaka et al.

A bound-exciton and a donor-acceptor(D-A) pair emission in photoluminescence are identified for Te-doped A1_xGa_1-xAs. The D-A pair emission near band edge is assigned as Te-related donor to carbon acceptor transition and the donor binding energy is determined as a function of composition x up to 0.75. Except the deep DX level, a new shallower deep state is found in deep level transient spectra under light illumination and is associated with Te-related donor state in PL.

We proposed that the thermal magnetokinks in flux lines can form due to thermal activation in high T_c superconductors. This implies that a flux line is no longer a straight one. Basing on this model, we discussed preliminarily the behaviour of magnetoresistance.

Magnetic properties and crystallization of amorphous Fe₆₂CO_15.5Nd₄B_18.5 alloy are studied. The Curie temperature of the present sample is l27K higher than that of amorphous Fe_77.5Nd₄B_18.5 alloy, but their crystallization temperature is compatible with each other. A coercive field of 2.34kOe, a remanence of 12.3kG and an energy product of 11.6MGOe are obtained at room temperature in the Fe₆₂CO_15.5Nd₄B_18.5 alloy annealed at 650°C. The 15.5at.%-Co substitution for Fe results in an increase of about 1l0K in T_c of 2:14:1 phase.