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Investigation on the Formation of Herringbone Structure in TypeⅡSolar radio Bursts

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Research in Astronomy and Astrophysics 2023年第5期23卷 101-109页

作者： Z.Z.Abidin A.N.Zulkiplee V.Epin F.A.M.Pauzi radio Cosmology Research Lab Physics Dept.Faculty of ScienceUniversity of MalayaKuala LumpurMalaysia

We report detailed observation of the“herringbone”of a Type II solar radio burst that occurred on 2010 November *** from the Space Weather Prediction Center,National Oceanic and Atmospheric Administration,e-CALLISTO,and Nan?ay radio Heliograph are *** determine the brightness temperature and degree of circular polarization of the“herringbone”*** between the physical parameters and the“herringbone”are *** on the relationship,this is the first study that suggested this“herringbone”was generated through fundamental plasma.

关键词： Sun activity-Sun corona-Sun coronal mass ejections(CMEs)-Sun magnetic fields-Sun radio radiation

A DECISION FEEDBACK EQUALIZER FOR NON-LINEAR CHANNELS

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Journal of Electronics(China) 1995年第4期12卷 352-358页

作者：王永德庞晓忠 dept. of radio Electronics Sichuan University Chengdu 610064

A Simple and useful decision feedback equalizer used for non-linear channels with severe linear distortion and mild non-linear distortion is proposed. It is a combination of a nonlinear channel equalizer based on connectionist model and a common decision feedback equalizer for linear channels. For a typical non-linear channel model it is shown that the equalization performances of the proposed equalizer are improved significantly.

关键词： Adaptive equalization Non-linear channels Decision feedback equalizers

The Electromagnetic Scattering by Buried Complex Objects

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Journal of Systems Engineering and Electronics 1997年第4期8卷 17-22页

作者： Lu Shu, Chang Mei & Xu Penggen dept. of radio Physics, Wuhan University, 430072, P. R. China dept. of radio Physics Wuhan University 430072 P. R. China

The solution of scattering problem of buried complex bodies needs to not only consider the scattering from the complex bodies, but also apply the boundary conditions in two different types of coordinate systems. This paper applies the conversion technique of vector wave functions combined with the three-dimensional unimoment method to effectively solve this type of complex electromagnetic problem. Using the conversion relations between the cylindrical and spherical vector wave functions, two types of boundary-value problems are conveniently jointed. Both the vector wave function expansion and the multipole expansion belong to eigen function expansion methods and have the same convergence rate. But the former is more rigorous in theory and needs to calculate only two types of eigen components while the latter needs to calculate four types.

关键词： EM scattering Buried complex object Unimoment method.

A NEW ADAPTIVE FILTERING SCHEME BASED ON WAVELET TRANSFORM

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Journal of Electronics(China) 1999年第3期16卷 257-262页

作者： Wang Yongde He Peiyu Wang Chunxia(dept. of radio Electronics, Sichuan University, Chengdu 610064) dept. of radio Electronics Sichuan University Chengdu

Based on the scale function representation for a function in L2(R), a new wavelet transform based adaptive system identification scheme is proposed. It can reduce the amount of computation by exploiting the decimation properties and keep the advantage of quasi-orthogonal transform of the discrete wavelet, transform (DWT). The issue has been supported by computer simulations.

关键词： IIR SP NLMS A NEW ADAPTIVE FILTERING SCHEME BASED ON WAVELET TRANSFORM DWT IEEE

A KIND OF HYBRID LANGUAGE MODEL EMPLOYED IN POST PROCESSING OF CHINESE SPEECH RECOGNITION

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Journal of Electronics(China) 1998年第3期15卷 221-225页

作者： Mei Yong Xu Bingzheng Wang Qunsheng(dept. of radio Engineering, SCUT, Guangzhou 510641) dept. of radio Engineering SCUT Guangzhou

A kind of Chinese combined language model, that takes into account POS(part of speech) information in a trigram-based statistical language model, is presented in the paper. The theoretical analysis and experiments all show that the model not only is lower than trigram model in PP(perplexity), but also is superior to trigram model in dependence on testing text domain.

关键词： Trigram model Tripos model Combined model Perplexity Robustness

A Second-Order Statistics Based Algorithm for Blind Separation of Signals

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Journal of Systems Engineering and Electronics 1999年第3期10卷 1-6页

作者： Liu Ju Wang Tai jun & He Zhenya dept. of radio Engineering, Southeast University, Nanjing 210096, P. R. China Mei Liangmo(dept. of Electronic Engineering, Shangdong University, Jinan 250100, P. R. China ) dept. of radio Engineering Southeast University Nanjing 210096 P. R. China dept. of Electronic Engineering Shangdong University Jinan 250100 P. R. China

We propose an information theory based objective function for measuring the statistics independent of source signals. Then, we develop a learlling algorithm for blind separation of nonstationary signals by minimizing the objective function, in which the property of nonstationary and direct architecture neural network is applied. The analysis demonstrates the equiralence of two neural architectures in some special cases. The computer simulation shows the validity of the proposed algorithm. We give the performance surface of the object function at the last of the paper.

关键词： Signal separation Neural networks Statistics independent

Preliminary analysis of chemical reaction under the radiation of electromagnetic wave

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Chinese Science Bulletin 2000年第19期45卷 1821-1824页

作者： Kama Huang Ning Liu Changjun Liu Liping Yan Sichuan Univ Dept Elect & Radio Chengdu 610064 Peoples R China

Microwave can be used to accelerate chemical reaction and improve the rate of production. Does microwave only act as a heating factor? Do there exist any specific effects? These questions are still holding a violent controversy. Here we will choose the Belousov-Zhabotinsky reaction, which is sensitive to surrounding effects, to study the influence of microwave on chemical reactions. Visible changes of periods have been observed. It appeares that there could have been specific effects of microwave.

关键词： microwave electromagnetic wave Belousov-Zhabotinsky reaction specific effects.

Seismic fragility assessment of RC frame structure designed according to modern Chinese code for seismic design of buildings

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Earthquake Engineering and Engineering Vibration 2012年第3期11卷 331-342页

作者： D. Wu S. Tesfamariam S.F. Stiemer D. Qin Key Laboratory of Earthquake Engineering and Applied Technique of Guangdong Province Guangzhou 501405 China School of Engineering University of British Columbia Kelowna V1 V 1 V7 Canada dept. of Civil Engineering University of British Columbia Vancouver V6T 1Z4 Canada dept. of Civil Engineering Radio Film and Television Design and Research Institute Beijing 100045 China

Following several damaging earthquakes in China, research has been devoted to find the causes of the collapse of reinforced concrete （RC） building sand studying the vulnerability of existing buildings. The Chinese Code for Seismic Design of Buildings （CCSDB） has evolved over time, however, there is still reported earthquake induced damage of newly designed RC buildings. Thus, to investigate modern Chinese seismic design code, three low-, mid- and high-rise RC frames were designed according to the 2010 CCSDB and the corresponding vulnerability curves were derived by computing a probabilistic seismic demand model （PSDM）.The PSDM was computed by carrying out nonlinear time history analysis using thirty ground motions obtained from the Pacific Earthquake Engineering Research Center. Finally, the PSDM was used to generate fragility curves for immediate occupancy, significant damage, and collapse prevention damage levels. Results of the vulnerability assessment indicate that the seismic demands on the three different frames designed according to the 2010 CCSDB meet the seismic requirements and are almost in the same safety level.

关键词： building damage criteria collapse ratio probabilistic seismic demand model (PSDM) fragility curves Chinese Code for Seismic Design of Buildings (CCSDB)

OPTIMIZATION OF THE MAGNETIC DEFLECTION SYSTEM BY THE METHOD OF ORTHOGONAL DESIGN

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Journal of Electronics(China) 1989年第1期6卷 80-84页

作者：谢志行黄达诠沈庆垓 dept.of radio Englineering Zhejiang UniversityHangzhor

By using the expressions of the field parameters and with the aid of the Orthogonal DesignMethod,we optimized the design of the saddle delection yoke with a ferromagnetic *** results ob-tained agree with the practical *** is pointed out that the end ear and the distribution of the fieldparameter B0（z）have important effects on the deflection *** example is given,in which the elec-tron optical properties of the deflection coils having cosine distribution and finite length and that of the de-flection coils having distributed winding are compared.

关键词： Electron optics Deflection system Method of optimization