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1992 Vol. 14, No. 2
Display Method:
1992, 14(2): 113-119.
Abstract:
The continued traction tactics for cryptanalysis based on Legendre theorem of continued fraction are proposed.
The continued traction tactics for cryptanalysis based on Legendre theorem of continued fraction are proposed.
1992, 14(2): 120-126.
Abstract:
A method based on spatial filter preprocessing is presented to enhancethe resolution of the existing spectrum estimation algorithms. The effective signal-to-noise ratio (SNR) and the accuracy of autocorrelation estimation are significantly improved t...
A method based on spatial filter preprocessing is presented to enhancethe resolution of the existing spectrum estimation algorithms. The effective signal-to-noise ratio (SNR) and the accuracy of autocorrelation estimation are significantly improved t...
1992, 14(2): 127-133.
Abstract:
The fixed frame length maximum correlation method which is the optimum method in a binary symmetric channel has been proved. With Poisson distribution, the frame sync acquisition probability is obtained and followed by computer simulation. By Markov ...
The fixed frame length maximum correlation method which is the optimum method in a binary symmetric channel has been proved. With Poisson distribution, the frame sync acquisition probability is obtained and followed by computer simulation. By Markov ...
1992, 14(2): 134-141.
Abstract:
First, the linear theories of frequency stability in nearly sinusoidal feedback oseil-lators are simply reviewed. Then, the describing function method and determining equation approach are applied to obtain new expressions for the oscillation-frequen...
First, the linear theories of frequency stability in nearly sinusoidal feedback oseil-lators are simply reviewed. Then, the describing function method and determining equation approach are applied to obtain new expressions for the oscillation-frequen...
1992, 14(2): 142-148.
Abstract:
The zero-voltage quasi-resonant boost switching DC-DC converter have been investigated by using the time averaging equivalent circuit approach of periodically switching linear networks. The DC steady state and the AC small signal characteristics of t...
The zero-voltage quasi-resonant boost switching DC-DC converter have been investigated by using the time averaging equivalent circuit approach of periodically switching linear networks. The DC steady state and the AC small signal characteristics of t...
1992, 14(2): 149-155.
Abstract:
The dual space theory is introduced for extracting the natural frequencies of a radar target from a measured response. The theory not only contains Prony method,SVD method and E pulse method, but also gives a new scheme-the Combination Operation(CO) ...
The dual space theory is introduced for extracting the natural frequencies of a radar target from a measured response. The theory not only contains Prony method,SVD method and E pulse method, but also gives a new scheme-the Combination Operation(CO) ...
1992, 14(2): 156-162.
Abstract:
The boundary-element method is used for the investigation of horn antennas, and the input standing-wave property, aperture field, near field and far field of horn antennas are studied throughly. The obtained results are in good agreement with data av...
The boundary-element method is used for the investigation of horn antennas, and the input standing-wave property, aperture field, near field and far field of horn antennas are studied throughly. The obtained results are in good agreement with data av...
1992, 14(2): 163-169.
Abstract:
Based on the quasi-measured values of tropospheric refraction,it is discussed that the exponential atmospheric model is reasonable, and according to the stable fea-ture of refractivity at 9 km above sea level, a simplified method to predict troposphe...
Based on the quasi-measured values of tropospheric refraction,it is discussed that the exponential atmospheric model is reasonable, and according to the stable fea-ture of refractivity at 9 km above sea level, a simplified method to predict troposphe...
1992, 14(2): 170-175.
Abstract:
One of the most diffuculties in designing ICRH antenna is how to analyse and estimate the electric forces on it when so high a plasma current disappears rapidly as the plasma disruption occurs. In this paper, a means to analyse and calculate these fo...
One of the most diffuculties in designing ICRH antenna is how to analyse and estimate the electric forces on it when so high a plasma current disappears rapidly as the plasma disruption occurs. In this paper, a means to analyse and calculate these fo...
1992, 14(2): 176-183.
Abstract:
The electron optical column for variable rectangular-shaped beam lithography system DJ-2 is described, with emphasis on the analysis of optical configuration and shaping deflection compensation. In this column the variable spot shaping is performed w...
The electron optical column for variable rectangular-shaped beam lithography system DJ-2 is described, with emphasis on the analysis of optical configuration and shaping deflection compensation. In this column the variable spot shaping is performed w...
1992, 14(2): 184-189.
Abstract:
Two methods for improving the equidriving power-frequency characteristics of broadband high power klystrons are presented. One is that a comb-line bandpass filter with attenuation properties is inserted between the TWT driver and the klystron for com...
Two methods for improving the equidriving power-frequency characteristics of broadband high power klystrons are presented. One is that a comb-line bandpass filter with attenuation properties is inserted between the TWT driver and the klystron for com...
1992, 14(2): 190-198.
Abstract:
An AC small-signal transistor model incorporating 8 nonlinearities using Taylor series representations is described. Based on this method, a nonlinear distortion-analysis program has been developed. It is used to compute the third-order intermodulati...
An AC small-signal transistor model incorporating 8 nonlinearities using Taylor series representations is described. Based on this method, a nonlinear distortion-analysis program has been developed. It is used to compute the third-order intermodulati...
1992, 14(2): 199-202.
Abstract:
The concept of multilayer set and its representation are introduced. Two examples of its application in graphic layout design are discussed.
The concept of multilayer set and its representation are introduced. Two examples of its application in graphic layout design are discussed.
1992, 14(2): 203-207.
Abstract:
The effects of finite word length in LMS adaptive noise canceller are discussed. The theoretical formula of output signal-to-noise ratio involving quantization noise and round-off noise are derived. If the variation of input weak signal can be reflec...
The effects of finite word length in LMS adaptive noise canceller are discussed. The theoretical formula of output signal-to-noise ratio involving quantization noise and round-off noise are derived. If the variation of input weak signal can be reflec...
1992, 14(2): 208-211.
Abstract:
The design principles and structure, characters of a kind of pulse Cunndiode, microwave circuit and pulse modulator are described. The performances of the developed pulse Gunn oscillator are as follows: in the frequency range of 3-4 GHz, the maximum ...
The design principles and structure, characters of a kind of pulse Cunndiode, microwave circuit and pulse modulator are described. The performances of the developed pulse Gunn oscillator are as follows: in the frequency range of 3-4 GHz, the maximum ...
1992, 14(2): 212-216.
Abstract:
A basic scheme for detecting subsurface targets with EM pulse of nanoseconds and an especially developed travelling-wave antenna of high quality are described. The antenna is a sort of sector antenna with structure of three layers, which possesses hi...
A basic scheme for detecting subsurface targets with EM pulse of nanoseconds and an especially developed travelling-wave antenna of high quality are described. The antenna is a sort of sector antenna with structure of three layers, which possesses hi...
1992, 14(2): 217-220.
Abstract:
A modified C-V method for determination of charge density in LB mono-film is presented. The inaccuracy problem of the conventional C-V method is overcome entirely The method is proved to be applicable by determining the charge density in the monofilm...
A modified C-V method for determination of charge density in LB mono-film is presented. The inaccuracy problem of the conventional C-V method is overcome entirely The method is proved to be applicable by determining the charge density in the monofilm...
1992, 14(2): 221-224.
Abstract:
A systematic study of TiO2 ceramic boundary layer capacitor (BLC) ismade. TiO2 ultrafine powder microdoped with Nb5+, Ba2+ is prepared by spray drying. The relations between the dielectric properties of TiO2 and the sintering temperature, measuring c...
A systematic study of TiO2 ceramic boundary layer capacitor (BLC) ismade. TiO2 ultrafine powder microdoped with Nb5+, Ba2+ is prepared by spray drying. The relations between the dielectric properties of TiO2 and the sintering temperature, measuring c...
