Zhang Zhi-min

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In this paper, some simulation results of 3D imaging of ground moving target are presented. Chirp stepped-frequency signal is transmitted in the interferometric inverse synthetic aperture radar system. Before the processing of 3D imaging, the strong ground clutter has been removed by using a new chirp stepped-frequency signal format. Then the 3D images of(More)
The equipment is a spaceflight electronic system. We have adopted the extrusion method under equal extruding temperature of 350 - 380°C. Based on stress-strain data gaining from isothermal compression experiment, adopts rigid - plastic finite element method, simulating isothermal-extrusion deformation of which the component is wrought magnesium(More)
For the requirements of constant temperature on device, that completes high-precision automatic system control through the fuzzy-PID hybrid control technology, by AT89C52 as the control center. The results show that the tank temperature stable operation, the system under constant temperature control accuracy ± 0.1, to meet the design accuracy.
f in : W u h a n D a x u e Xuebao (Z i ran K e x u e B a n ) , 1 9 9 9 , 4 5 ( 6 ) 9 7 9 1 ~ 794] S y n t h e s e s and P r o p e r t i e s Studies on N e w D i s p e r s e d Dyes W i t h I n t e r m e d i a t e BIT ZHANG Zhi-min, SUN Li-fang, LIAO Jun, LIANG Shu-cai, QIU Xiao-qun (College of Chemistry and Environment Science,Wuhan University,Wuhan(More)
In order to study the effect of plastic deformation on microstructure and mechanical properties of as-cast AZ80 magnesium alloy, the experiment of direct extrusion was done to homogenized billets. The microstructure and mechanical properties of original samples and deformed samples were investigated. Experimental results show that homogenization can(More)
SAR (synthetic aperture radar) raw signal simulation is an important tool for study and testing of different SAR processing algorithms and new SAR systems. In this paper, the system transfer function of spotlight-mode SAR is evaluated and its accuracy is described. And, frequency scaling algorithm (FSA) is employed to actualize the coupling relation between(More)
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