In this paper, by applying the network graph theory, the concept of cycle-seg mixed basis matrix, the matrix representation of Kirchhoff s law in the mixed basis and the mixed basis equations of general linear networks are presented. Then the cycle current-seg voltage mixed analysis method of general linear networks is established. By this way, the mixed analysis method for passive networks without mutual inductances in referenee [4] is extended to one for active networks with mutual inductances.

A nonlinear circuit is investigated, which is characterized by high effeciency, simple and reliable construction, and large tuning frequeney range. For the circuit operating in AC and saturation condition, a mathematical model of the ferrites as the nonlinear inductance element is built up. Along with the exp-erimental work done on the circuit, the frequency conversion characteristics of the nonlinear circuit, the limit of the frequency multiplication, and the power output are discussed by means of compute-aided analysis. Computed results by computer are compared with the experimental ones.

In this paper the finite-element analysis method of waveguide eigenvalue problem is briefly discussed. A standard program using finite-element method to solve waveguide eigenvalue problems is presented. With this program, it is possible to calculate the eigenvalues and eigenfunctions for a group of waveguides consisting of lines and circular arcs. The calculations of eigenvalue problems for more than ten different structure waveguides verify the reliability of the program.

It is found that the linear frequency modulation is used on a voltage-controlled oseillator and a phase-locked loop to lock its starting-frequency phase for generating a coherent chirp signal. For a high-gain second-order loop, the loop parameters and the modulating frequency rate must be chosen to satisfy the condition, O < ε < 1, and then it is possible to realize the FM on the VCO, while the loop is not necessarily broken during FM pulse.In this paper, the PLL' s equation is transformed into a nearly linear differential equation and its asymptotic solution is given by perburbation metho. Thus, the quantitative relationships about the effects of the PLL on the LFM waveform are obtained. Finally, results of simulation by means of computer show good agreement with the theoretical analysis.

Misplaced p-n junetion in the LPE D. H. GaInAsP/InP wafer is investigated by scanning electron microscope and electron beam-induced current method. It is shown that one of the reasons for the misplaced p-n junetion is Zn contamination. By controlling doping level of p-type dopant Zn, or using Mg as p-type dopant, the correctly located p-n junetion is obtained. The locations of the p-n junetion of some samples are measured by electrochemical c-v method. The results obtained are consistent with the emission spectrum of the LED fabricated from the wafers.

In this paper, the photoconduction response and related effects under different conditions are investigated from the view point of dynamics. The photoconduction response under strong electric field is discussed.The photoconduction response under different illumination and different field intensity have been measured. In strong light region with certain strong field, the time constant τ₀ versus illumination F is given by the relation τ₀=aF^-0.5; however, τ₀ is a constant in weak light region. The rise time varies exponentially with the field intensity, but the decay time is a constant. Because normal ideas about crystals could not fir the condition of a-Si, we derived an equation of photoconduction response with illumination in both weak and strong light regions, according to the Mott-CFO model and by the rate equations. It can explain the expermental results well.

Preliminary results of an 8 mm band H₀₂ mode gyromonotron operating at the second harmonic of the cyclotron frequency are presented. The device can produce a pulse power about 30 kW. The physical mechanism of the harmonie operation is discus-sed and the mode control measures are also described.

The violet output power over 500 mW obtained from a krypton ion laser and succes-sfully applied to detect cancer is reported.