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1991 Vol. 13, No. 2
Display Method:
1991, 13(2): 113-118.
Abstract:
The design of ternary cdge-triggered JKL-type filp-flop is proposed. The computer simulation and the test in experimental circuit made up with TTL gate show this flip-flop has the expected logic functioas.
The design of ternary cdge-triggered JKL-type filp-flop is proposed. The computer simulation and the test in experimental circuit made up with TTL gate show this flip-flop has the expected logic functioas.
1991, 13(2): 119-124.
Abstract:
The electromagnetic field problem of a rectangular grating illuminated with TM wave is studied theoretically by means of rigorous field-matching and moment method. The numerical calculations show that the grating, as a frequency scan antenna, can pro...
The electromagnetic field problem of a rectangular grating illuminated with TM wave is studied theoretically by means of rigorous field-matching and moment method. The numerical calculations show that the grating, as a frequency scan antenna, can pro...
1991, 13(2): 125-130.
Abstract:
Usually, weighted array antennas are designed by using the statistical appro-ach. In this paper, the application of the Markoy chains of a random process to the design of density weighted or phase weighted arrays is considered. The new approach is pr...
Usually, weighted array antennas are designed by using the statistical appro-ach. In this paper, the application of the Markoy chains of a random process to the design of density weighted or phase weighted arrays is considered. The new approach is pr...
1991, 13(2): 131-137.
Abstract:
A definition of combined phase centre for conical horn feeds is given. Formulas of E-plane and H-plane combined phase centre for conical horns and the corres-ponding optimal model are presented, and a fast optimization method for solving this model i...
A definition of combined phase centre for conical horn feeds is given. Formulas of E-plane and H-plane combined phase centre for conical horns and the corres-ponding optimal model are presented, and a fast optimization method for solving this model i...
1991, 13(2): 138-144.
Abstract:
An analysis of solving the electromagnetic scattering by buried objects using the vector vvave function expansion is presented. For expanding the boundary conditions both on the planar air-earth interface and on he spherical surface, the conversion r...
An analysis of solving the electromagnetic scattering by buried objects using the vector vvave function expansion is presented. For expanding the boundary conditions both on the planar air-earth interface and on he spherical surface, the conversion r...
1991, 13(2): 145-150.
Abstract:
The regularity of electron motion with non-circular orbits in an electro-static centrifugal system is investigated. Through extensive numerical computation, analysis and investigation, the following results are obtained: there exist radial and azimut...
The regularity of electron motion with non-circular orbits in an electro-static centrifugal system is investigated. Through extensive numerical computation, analysis and investigation, the following results are obtained: there exist radial and azimut...
1991, 13(2): 151-158.
Abstract:
A thin post with arbitrary height in a rectangular waveguide is treated by the moment method. The electric field integral equation of the post is solved with the pulse expansion and point matching. The convergence of some series involved is accelerat...
A thin post with arbitrary height in a rectangular waveguide is treated by the moment method. The electric field integral equation of the post is solved with the pulse expansion and point matching. The convergence of some series involved is accelerat...
1991, 13(2): 159-168.
Abstract:
By solving the basie equations of magnetic field in the anisotropic magnetic media in which the tensor ik is symmetric, an integral formula for anisotropic vector potential A is obtained. By which the character form ulae for self- and mutual inductan...
By solving the basie equations of magnetic field in the anisotropic magnetic media in which the tensor ik is symmetric, an integral formula for anisotropic vector potential A is obtained. By which the character form ulae for self- and mutual inductan...
1991, 13(2): 169-176.
Abstract:
The effect of the -Si:H target voltage on the spectral photosensitivity is measured in a demountable apparatus with interchangeable targets. It is found that the effect of target voltage on the photoresponse increases when the light wavelength decrea...
The effect of the -Si:H target voltage on the spectral photosensitivity is measured in a demountable apparatus with interchangeable targets. It is found that the effect of target voltage on the photoresponse increases when the light wavelength decrea...
1991, 13(2): 177-182.
Abstract:
The activation experiments have been conducted with bulk p+ GaAs single crystal samples without any additional epitaxy or cleavage in vacuum. AES analysis is used to assist the establishment of surface cleaning processing. The easy determination of f...
The activation experiments have been conducted with bulk p+ GaAs single crystal samples without any additional epitaxy or cleavage in vacuum. AES analysis is used to assist the establishment of surface cleaning processing. The easy determination of f...
1991, 13(2): 183-192.
Abstract:
Based on the synthetic study of the previous magnetic combined objective lenses, such as MOL (moving objective lens), VAL (variable axis lens), SOL (swinging objective lens) etc; the general theory of combined objective lenses is approached, and a se...
Based on the synthetic study of the previous magnetic combined objective lenses, such as MOL (moving objective lens), VAL (variable axis lens), SOL (swinging objective lens) etc; the general theory of combined objective lenses is approached, and a se...
1991, 13(2): 193-196.
Abstract:
Under the physical optics approximation, Bojarski s Identity is expanded to the general bistatic scattering scheme. The result is more general than that obta-ined under the prerequisite k Ei =k0Ei = 0 by S. R. Raz (1976). The benefit of the bistatic ...
Under the physical optics approximation, Bojarski s Identity is expanded to the general bistatic scattering scheme. The result is more general than that obta-ined under the prerequisite k Ei =k0Ei = 0 by S. R. Raz (1976). The benefit of the bistatic ...
1991, 13(2): 197-201.
Abstract:
The complex parameters of single or double imhomogeneous lossy dielectric slabs can be determined if the slabs is illuminated by a harmonic electromagnetic wave and the scatte-red field is measured. The method of determiniing parameters is described ...
The complex parameters of single or double imhomogeneous lossy dielectric slabs can be determined if the slabs is illuminated by a harmonic electromagnetic wave and the scatte-red field is measured. The method of determiniing parameters is described ...
1991, 13(2): 202-206.
Abstract:
By utilizing transmission line theory, practical expressions for the longitudinal nonuniformity of the electric field distribution in TEM cells are obtained. Numerical results agree well with experimental ones shown by M. L. Crawford (1977) at some f...
By utilizing transmission line theory, practical expressions for the longitudinal nonuniformity of the electric field distribution in TEM cells are obtained. Numerical results agree well with experimental ones shown by M. L. Crawford (1977) at some f...
1991, 13(2): 207-210.
Abstract:
The reciprocity and the unitarity of non-loss linear networks in zero state are derived from the mucual energy theorem.
The reciprocity and the unitarity of non-loss linear networks in zero state are derived from the mucual energy theorem.
1991, 13(2): 211-216.
Abstract:
A new lower bound on the dimensions of Goppa codes bas been given by Feng Guiliang (1983). In this paper, at first, a formula for computing the lower bound in some cases is offered, and a upper bound on the dimensions of Goppa codes and a method of f...
A new lower bound on the dimensions of Goppa codes bas been given by Feng Guiliang (1983). In this paper, at first, a formula for computing the lower bound in some cases is offered, and a upper bound on the dimensions of Goppa codes and a method of f...
1991, 13(2): 217-220.
Abstract:
DC discharge characteristic for metai vapor laser at high power level were mea-sured for the first time using He, Ne, N2, Ar as buffer gases. It was found that He is the best buffer gas for DC discharge preheating. More than 5kW electric power was in...
DC discharge characteristic for metai vapor laser at high power level were mea-sured for the first time using He, Ne, N2, Ar as buffer gases. It was found that He is the best buffer gas for DC discharge preheating. More than 5kW electric power was in...
1991, 13(2): 221-224.
Abstract:
A new technique called selective anodic oxidation, by which the ununiform epilayers can be thinned, is presented. The thickness of n+-layers of GaAs IMPATT diodes with n+-n-n++ structure has been strictly controlled by the use of this technique. This...
A new technique called selective anodic oxidation, by which the ununiform epilayers can be thinned, is presented. The thickness of n+-layers of GaAs IMPATT diodes with n+-n-n++ structure has been strictly controlled by the use of this technique. This...
