Complex dielectric constant ε=ε'-iε" of a semiconducting BaTiO₃ ceramics has been measured at room temperature over the frequency range of 10kHz-500MHz. This dielectric response can be approximately described by the Debye type relaxtion equations, whereas the conductivity dominates the imaginary part at lower frequencies. From the dielectric measurement, the resistivity and the dielectric constant have been evaluated for the grains and grain boundaries separately.

The theoretical prediction and experimental detection for photoacoustic layered imaging by selecting the signal of proper phase angle are described. Using this technique, we can increase the contrast of the subsurface features and suppress the surface influence. Some experimental results of layered imaging are presented.

A suggestion to define the state of an oscillator by two wave functions is proposed. These two functions can be combined to completely describe the motion of the oscillator. In this description, both the energy and the phase of the oscillator simultaneously have definite values. The usual theory of oscillators is a statistical case of the new description.

The prediction that there might be shell effect in pre-equilibrium emission of (α, p) reaction is true. It seems that there is also shell effect in the change of the average value of the square of transition matrix element of two-body residual interaction with different target nuclei at the lower excitation energy.

Spin-exchange collisions between polarized ⁸⁷Rb atoms and unpolarized ¹²⁹Xe nuclei have been used to produce nuclear spin polarized ¹²⁹xe. Measurements of the longitudinal relaxation rate of ¹²⁹Xe nuclear polarization have been carried out in a 5.7G magnetic field. The present results show that the nuclear spin relaxation rate of ¹²⁹Xe in ⁸⁷Rb vapor is proportional to the density of the ⁸⁷Rb atoms, and the nuclear spin relaxation rates of ¹²⁹Xe induced by the ⁸⁷Rb atoms depend on the pressure of the buffer gas N₂.

The influence of additive Dy₂O₃ on the magnetic properties of Nd₁₆(Fe_0.96A_0.04 )₇₇B₇ has been investigated. It is shown that when the Dy₂O₃ concentration is 4wt% the intrinsic coer-civity _iH_c of the sintered magnets increases to 17850 Oe.

The increase of phase transition temperatures both from α-to γ-phase and from γ-to β-phase of LiIO₃ in the dispered system LiIO₃ (γ-A1₂O₃) has been observed. The -phase can be stabilized to ambient condition by the presence of γ-A1₂O₃. The stability of γ-A1₂O₃ and -LiIO₃ is improved by the addition of γ-A1₂O₃.

Importance of the bag skin effect to determine the parameters of the Friedberg-Lee model is pointed out. The European Muon Collaboration (EMC) effect regarded as a bag skin effect can be used to determine the parameters of this model.

The relativistic explanation of pulsar drift is based on an extremely simplistic model. The collapsing star is treated as composed of a collection of particles falling radially inwards. A calculation incorporating a finite angular momentum is found to give reasonable drift velocities provided the initial pulsar frequency is sufficiently high. The values required are not unreasonable.

The micro-morphology of the interface transition from (01 ī 2) facet to freezing isotherm curve has been observed. In the centre of the interface (the high supercooling region), the morphology of (01 ī 2) facet shows characteristics of terrace-step-kink structure. By reducing supercooling, the growth interface gradually turn to agreeing with the freezing isotherm curve.

The 1+1 and 1+1+1 soliton solutions with different polarization for coupled nonlinear Schrodinger (NLS) Equations have been obtained by using Bilinear Method. The asymptotic behaviour and the polarization of these solutions are discussed.

Photoreflectance of GaAs doping superlattices has been measured at 300K. The spectra exhibits features corresponding to spatially direct transitions due to quantized electron or hole states. We demonstrate the utility of the photoreflectance technique for studying quantum size effects in doping superlattices.