最新刊期
卷 ， 期 3 ， 1991
- 摘要：Based on theoretical research, the form of the TD correction model in remote sea is selected. After analyzing and processing the data measured during July 1988 and May-June, 1989 we have determined the TD correction model tentatively. The RMS of the deviation of calculated TD correction values according to the model from the measured ones is about 0.2～0.3μs.2|45|2更新时间：2025-12-08
- 摘要：Based on the structure of m-sequence and the trace representation,a newclass of nonlinear pseudorandom sequences over GF（qm） is constructed and some properties of the sequences are investigated. This class of sequences possesses the same value-distribution, ru-nproperty, autocorrelation function and shift-and-add property as m-sequences. The number ofthe new class of nonlinear sequences is /m times as many as that of m-sequences with the same period.2|57|0更新时间：2025-12-08
- 摘要：A new definition for Real-valued Fourier transform（RFT） is presented. By this definition, a Fast Real-valued Fourier Transform （FRFT） algorithm is developed for calculating Discrete Fourier Transform （DFT） of Real-valued sequence. It is an in-place algorithm with better regularity in structure among algorithms which takes the least number of multiplication, total opration, and size of memory.2|69|3更新时间：2025-12-08
- 摘要：A novel class of bidirectional associative neural networks （BANN） is proposed in this paper. In contrast to the more conventional technique of forming an energy metric for the neural network, the BANN performed by alternating projection between two different Hilbert space and so the BANN retain the better attributes, such as the ease of analysis in signal space, high accuracy of the steady-state solution and fast training. The network can be configured as either a heteroassociative memory or a classfier.Simulation results on storing and retrieving bipolar patterns in BANN’s are presented to show its good performance.2|26|2更新时间：2025-12-08
- 摘要：Based on the physical analysis of the horizontal and rectangular silicon epitaxial reactor, we have abandoned the stagnant and boundary sublayers assumption. In this work, various temperature zones and effects of temperature on velocity distribution and physical properties of mixed gases are considered. In addition, the thermodiffusion is taken into account. The distributions of temperature, velocity and concentration are calculated and the dependence of the growth rate distribution along the susceptor on the reactor geometry and technological conditions is obtained. Calculating results are also compared with experimental data.4|35|0更新时间：2025-12-08
- 摘要：This paper first describes the fundamentals of two-port phase noise measurement for microwave amplifiers and other devices. On the basis of the fundamental circuit, we have set up a highly sensitive phase noise measurement system, which contains a carrier suppression circuit, a phase modulation signal generation circuit, an appropriate exciting source and a set of advanced test equipment. The operating frequencies of the system are at 3cm band. The system can be used to measure the residual phase noise of amplifiers under test which can be operated under the condition of CM and PM. The background noise of the syste-m is less than-130dBc/Hz at 1kHz offset frequency.2|28|1更新时间：2025-12-08
- 摘要：In practice, nonuniform sampling occurs in high speed data acquisition system due to imperfect sampling timebase. In this paper, we first present a mode of nonuniformly sampled signals and basic principle of digital spectrum analysis, and then derive in detail digital spectra representation of nonuniformly sampled periodic signal. Some important properties are explored. Finally, four special but interesting sampling cases are discussed and the signal-to-noise ratio, S/N, is derived in closed form. Several significant conclusions are drawn. The thought and conclusion in this paper are useful for analysing nonuniform time sequence, investigating spectrum estimation and designing high speed data acquisition system.2|87|4更新时间：2025-12-08
- 摘要：The sampled signal is often corrupted due to intrinsic noise in sampler and time jitter of sampling pulse when the continuous signal is in discretization. The evaluation of spectral errors and their bounds for sampled signal are discussed in this paper. The obtained results are useful for estimation of sampled signal and system quality.2|31|1更新时间：2025-12-08
- 摘要：The compositely structured inductive waveguide elements are analyzed by employing the equivalent source method in this paper. The number and cross section of the inductive posts are arbitrary, and they are either pure metallic or pure dielectric type, or composed of both metallic and dielectric ones. A number of inductive waveguide elements are numerically analyzed and a good agreement is achieved in comparison with the measured data or results available in published literatures.2|29|2更新时间：2025-12-08
- 摘要：Both analytic and synthetic methods of a new kind of L-type strong coupling directional coupler are presented. The relationship between L-coupler’s inherent parameters and odd-even modes is investigated. Devices designed based on this theory show good performances in a wide band. Experimental results are given at the end of this paper.2|86|0更新时间：2025-12-08
- 摘要：Scattering fields from dielectric cylinders with a structure of two layers are simulated using numerical matrix methods. The fields obtained are used to calculate the internal characteristics of cylinders by means of Filter-Back projection techniques. The radial distribution of phase and the amplitude of complex permittivity for cylinders are given with the loss tangent values retrieved statistically from the reconstructed image matrix.2|19|0更新时间：2025-12-08
- 摘要：The incident plane wave is expanded as a set of Gaussian beams. Then, the theoretical analysis for a two-dimensional concave reflector is completed and the formulae of scattering field and radar cross section are derived by means of complex ray tracing and paraxial approximation respectively, combined with the uniform theory of diffraction. The numerical results are obtained for both horizontal and vertical polarezations. The results from complex ray theory agree very well with those from Geometrical Optics.2|54|7更新时间：2025-12-08
- 摘要：The device parameter extraction is studied by means of global optimization in thrs paperr. The method depends largely upon software and has more advantages than using hardware. Take the device parameter extraction of GaAs MESFET for example, the global optimization is verified and the problem of its solution uniqueness is solved as well.2|29|4更新时间：2025-12-08
- 摘要：This paper describes a new field-vacuum microelectronics or vacuum integrated circuits （VIC）. Its principle, the structure of the field emission microtriodes and microfabri-cation technipues and processing are given in detail. The processing for the thin film field emission cathodes is also reviewed. The application of VIC and the related problems for its future development are discussed.2|71|3更新时间：2025-12-08
- 摘要：In this paper the dyadic Green’s functions for a rectangular waveguide with a E-plane dielectric slab are obtained by the Ohm-Rayleigh method with Hansen vectors of LE modes and LM modes of the structure.2|40|0更新时间：2025-12-08
- 摘要：The complete-matching theorem and generalized modesymmetry theorem are presented in this paper. It is proved that complete-matching state is possible for arbitrary port network except N=1.3. Some examples are given in the paper.2|179|2更新时间：2025-12-08
- 摘要：The method of gaining Nyquist third criterion response function is derived and checked in this paper, and the experimetal results are given.2|51|0更新时间：2025-12-08
- 摘要：In this paper, a knowledge-based design for testability （DFT）, is presented. A classified DFT is implemented under the guidance of the ’expert’ knowledge. The principle of selective tracing is also used to place test point, thereby testability is suboptimally improved in almost li near time. This method simplifies conventional DFT because of its self-learning ability.2|43|3更新时间：2025-12-08
- 摘要：BBP88. a knowledge-based expert system for VLSI BBL placement design is introduced in this paper. This system consists of three parts: dada preprocessing intelligent placement and interactive placement improvements. The paper lays stress on the method of intelligent placement and the inference machine of system BBP88- Lastly, some experiments and conclusions are given.2|15|0更新时间：2025-12-08
- 摘要：In this paper, the evidence-theory-based plausible inference algorithm PMlIS whichis suitable for hierarchical logic is presented. This algorithm is particularly suitable for reasoning with uncertainty between hierarchical structures.2|39|0更新时间：2025-12-08
- 摘要：In order to compute the length-12 SDT, a radix 12 FFT algorithm has been proposed in this paper. It has only the real operations of 3.952 N log N.2|94|0更新时间：2025-12-08
- 摘要：This paper presents a novel state-space synthesis method for designing switched capacitor filters （SCFs） which (how the low-sensitivity to component variations in the passband. A general form of the matrix set of the state-space equations for SCFs with low-sensitivity performance and the relationship between the matrix set and the voltage transfer function are given. The results show that it is very simple to design low-sensitivity SCFs by the method presented.2|22|0更新时间：2025-12-08
- 摘要：A method for reconstructing 3-D object images from a set of return signals of a subsurface radar is developed. The image reconstruction process is described as a linear integral transformation. The degenerate kernel based on the principle of pulse compression and aperture synthesis is proposed and then is solved by means of variational method. The numerical results are demonstrated to prove that the imaging method with the new kernel is feasibility.4|124|1更新时间：2025-12-08
- 摘要：In This paper, a normalized linear quadtree representation is obtained by normalizing an object with respect to its centroid and principal axes. This representation is invariant to the translation, rotation, and scaling change of the object. Therefore, it can be used as a shape descriptor to aid in the identification of objects in images. An object may be identified by matching its shape to one of a number of models contained in a library utilizing a measure of symmetric difference.2|22|0更新时间：2025-12-08
- 摘要：This paper presents the ambiguty number methods to solve the problem of the range ambi-guties in multiple PRF system. The method using triple PRF is able to correct errors automatically, and can detect the maximum unambiguous range. It is so simple that it can be easily processed in real time.2|61|2更新时间：2025-12-08
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