A completely new method is presented to solve the inverse black body radiation problem. The solution makes use of the widely known and easily implemented Fourier transform, and the expression is very simple and clear. This method is of major significance with respect not only to the numerical computation, but also to uniqueness or existence of this problem. At the same time, this method is also very useful for many other fields.

A general relation between the total absorption and emission probabilities for nuclei in thermal equilibrium at a finite temperature is derived, and its relevance to giant resonances built on nuclear excited states discussed.

Multiphoton dissociation of C₄H₂N₂ molecules at 193nm has been studied at high laser intensities. Emission spectra are recorded from violet (B ²Σ →X ²Σ) bands of CN and the Swan bands of C₂ (d ³π_g a ³π_u).

It is well known that the soliton in trans-(CH)_x possesses a localized electronic state at the center of the gap. Besides this mid-gap state, we have found that there exist another four localized electronic states around the soliton. They form four discrete levels outside the conduction and valence bands: one sits near the bottom edge of the conduction band and one near the top edge of the conduction band; another two are located symmetrically near the valence band.

A calculation of the magnetic single-ion anisotropy in hematite has been made. The results show that an equivalent single-ion anisotropy field H_si(=103.8x10² Oe) exists along the c-axis at T=0K. The Morin transition in hematite could be explained by our results in conjunction with the calculated H_md by Artman et al.

Variation of the correlation length of icosahedral phase with the annealing temperature is got according to the broadening of the X-ray diffraction peak. The fact that the correlation length does not change during the crystallization process means that the grains of icosahedral phase are transformed wholly and perfectly to crystalline Al₆Mn.

The diffusion-limited aggregation model with long-range force is investigated. Single particles are moving under the control of Brownian motion and drift motion produced by regular centrical long-range force. The computer simulations under this condition have been studied in detail in two dimensions, and the results are compared with the properly electrolytic deposition experiments.

Resistance measurements at between 1.5 to 40K and Magnetoconductance measurements at about 1.5K have been made on l00Å Cu films, and also on Cu films with small amounts of La, Ce additives. The Ce atoms in Cu seem to give much stronger spin-orbit scattering than La atoms do. The behaviour of the Cu film with Ce additives is a composite of weak localization and Kondo effect.

This paper reports the fabrication and properties of small Nb--( a-Si )-Nb-(a-Si)-Nb Josephson tunnel junctions. The smallest junction area is about 0.3μm². A thin a-Si film deposited by electron beam evaporation was oxidized and used for the tunnel barriers. TEM and XPS investigations indicate that the barrier layers consist of SiO_x and Si. The junctions have been used for RF SQUID with an energy resolution of 1.9 x l0^-28 J/Hz.

It has been found that after the irradiation by fast neutrons the electron density and mobility of two-dimensional (2D) electron gas at modulation-doped GaAs/AlGaAs heterostructure interface increased by 17% and 23%, respectively, and the Hall plateaus and the minima of Shubnikov-de Haas (S-dH) oscillation curves anomalously shifted over each other. The measurements after three weeks showed that the effects mentioned above had disappeared substantially, however, the stronger persistent photoconductivity still remained.

The CP violation in B_s →F^±Fis of the order 0( 0.1) due to the interplay of mixing and interference. The event rate is about 10^-5, if C=+ for the primary B_sB_s pair .

The rules of truncation for getting a gauge invariant action from a gauge-fixed action are put forward and completed. It is shown that the presently well-known gauge invariant action (ψ |Q_B|ψ ) can also be obtained by means of truncaton. The confusion of considering this action as a gauge-fixed action is clarified.