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2003 Vol. 29, No. 6

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Experimental Investigation into Effects of Gurney Flaps on Supercritical Airfoil
Li Yachen, Wang Jinjun, Fan Jianchao, Zhang Lin
2003, 29(6): 471-474.
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An experimental study was performed on a supercritical airfoil in the FL-21 wind tunnel to investigate the lift-enhancement effects of the Gurney flaps at high speed conditions. The 0.5%C, 1.0%C, 1.5%C and 2.0%C height Gurney flap increased the maximum lift-coefficient by 6.0%, 12.4%, 21.7% and 22.3...
Aerodynamic Characteristic Study of Axial Transonic Highly LoadedContraRotating Turbine
Fang Xiangjun, Liu Siyong, Wang Ping
2003, 29(6): 475-479.
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Axial contra-rotating turbine(CRT) comparing with the conventional one has a series of advantages, such as more significant stage efficiency, lighter weight, shorter axial size and less components and so on, due mainly to elimination of stationary vanes. Mainly,CRT basic aerodynamic status was analy...
Anticollision Technology of Type A Cards Based on FiniteState Automata
Zhang Dawei, Zhang Qishan
2003, 29(6): 480-483.
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Based on the basic anticollision theory of Type A contactless smart cards, arithmetic description and state transition of bit collision detection protocol algorithm on cards were designed by finite state automata model. Anticollision procedures on cards were described with the virtue of a state diag...
Analysis of Spaceborne Spotlight SAR Antenna Beam Point Steering
Wang Guodong, Zhou Yinqing, Li Chunsheng
2003, 29(6): 484-488.
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In the condition of beam point steering, spaceborne spotlight SAR antenna model and imaging model were found. The math analysis confirmed that beam point steering resulted in echo amplitude being modulated and caused infinite pairs of echoes. So beam point steering would deteriorate image quality. B...
Study on Technique of Fast Acquisition Pseudo Noise Code in GPS Receiver
Xue Wenfang, Shao Dingrong, Li Shujian
2003, 29(6): 489-492.
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In order to reduce the time of acquisition pseudo noise code in GPS receiver, the conventional acquisition method slide correlation in the time domain was analyzed. The searching range of pseudo noise code was narrowed utilizing to the information provided by epicheirema. The lost reacquisition time...
Synthesis and Performance of Macroporous Anion Exchange Resin
Su Yuqin, Zhang Zuoguang
2003, 29(6): 493-496.
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Ion exchange method is one of the important technologies for abstracting metal from ore. The synthesis of a new macroporous anion exchange resin with two of weak-base functional groups for extracting gold from cyaniding pulp was presented.The effects of resin crosslinking and aminating condition on ...
Analysis of Operational Effectiveness for Multiple Fake TargetsCajolery Antagonizing ARM
Ma Dongli, Zheng Mingqiang, Xia Haiting
2003, 29(6): 497-500.
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The operational effectiveness of antagonizing ARM using multiple fake targets to protect a true one was investigated. Having established the aiming direction of an ARM, a method of computing the capture probability of the true and the fake targets was presented when seeker differentiates targets. A ...
Developments and Evolutions of ThreeDimensional Perturbations inTransitional Boundary Layer
Guo Hui, Lian Qixiang, Yury S. Kachanov, Vladimir I. Borodulin
2003, 29(6): 501-504.
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Formations and developments of typical 3-D perturbations, typically shown as Λ structures, hairpin vortices and ring-like vortices, were observed by means of hydrogen-bubble method in a transitional flat-plate boundary-layer excited by a modulated 2-D artificial perturbation. Visual results show the...
Lossless Image Compression Based on Feature of Local Texture
Jiang Hongxu, Zhou Xiaokuan
2003, 29(6): 505-508.
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Local texture was the basic element of recognizing the whole image and starting with analysis of local texture was a reasonable way in developing better decorrelation model. Based on this idea, a new lossless image data compression algorithm named lossless image compression based on feature of local...
Study of Stability for Strapdown Antenna Platform
Zhou Ruiqing, Lü Shanwei, Liu Xinhua
2003, 29(6): 509-511.
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The strapdown stabilization model for imaging presented by Rudin was applied to antenna stabilized platform. Based on invariance principle, matching filter was used to stabilize antenna platform. The results show that decoupling precision is increased 35 dB at frequency 0.5 Hz~1.0 Hz. The impact of ...
Studies of a Caret Inlet at Subsonic Speeds
Zhu Yu, Li Chunxuan, Li Tian
2003, 29(6): 512-515.
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A Caret inlet was studied by means of experiment and numerical simulation. Basic aerodynamic characteristics of the inlet at low and subsonic speeds were presented. The experimental as well as computational results revealed that flow separations may exist at match state of inlet/engine at low speeds...
Ground Experimental Modeling of the Oxygen Supply System'sDynamic Performance Under Explosive Decompression
Sun Bing, Yuan Xiugan, Zhao Yingchun
2003, 29(6): 516-520.
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Ground experimental method of modeling the oxygen supply's dynamic performance under explosive was presented. The comparisons of ground and explosive decompression cabin test results show that the dynamic profiles of pressure have good agreement, and there is a ratio between the pressure release tim...
Implementation of Network Interface Unit Based on HLA
Wang Huixia, Zhang Yuhong, Wang Xingren, Lin Xin
2003, 29(6): 521-524.
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To study how to transit the existed simulation systems based on distributed interactive simulation (DIS) standard to high level architecture (HLA) and how to develop a new system based on HLA, taking a blue sub-system of distributed virtual battlefield environment as study background, network interf...
TurboTCM Scheme for Digital Video Broadcast Systems
Ren Juntao, Shao Dingrong
2003, 29(6): 525-528.
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It was presented that Turbo trellis coded modulation (Turbo-TCM) scheme and the corresponding decoding algorithm for the system of digital video broadcast (DVB) system where the code rate of the inner error-correcting code was variable. The proposed TTCM scheme employs a simple rate 1/3 binary turbo...
Dual Linera Programming Approach for Parameter Uncertainty Interval Estimation
Sun Xianfang, Teng Jitao, Fan Yuezu
2003, 29(6): 529-533.
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The parameter uncertainty interval estimation (PIE) problem was transferred into a set of dual linear programming (DLP) problems, and an improved simplex method was proposed to solve these DLP problems. The dual relationship between the variables of the DLP problems was used to directly compute an i...
Application of RoleBased Access Control in Management Information System
Li Jian, Tang Wenzhong, Song Changfu
2003, 29(6): 534-538.
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Role based access control was being paid more and more attention as a security mechanism. Traditional access control policies, including discretionary access control (DAC) as well as mandatory access control (MAC), were first briefly introduced. An access control model based on RBAC2 was provided, w...
Environmental Impact Assessment of Vibration Induced by Pile Sinking
Xia Chuanyong, Yao Yangping, Luo Ting
2003, 29(6): 539-543.
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The features and the environmental impact of vibration induced by pile sinking, recognizing the importance of environmental impact assessment of vibration induced by pile sinking were discussed. It also analysed and explained assessment range, standards, grade, content and investigation of present s...
Real Time Simulation Research of ExtraVehicular Activity Control Technique
Han Chao, Liu Zhiqiang
2003, 29(6): 544-547.
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The attitude control of extra-vehicular activity (EVA) is a nonlinear and time variant control system with the uncertain parameters. It is difficult for general control method to deal with attitude control of EVA. For validating the disposal of adaptive control method for the problem and engineering...
Optical Flow Computation Based on Analytic Wavelet
Tian Tian, Zhou Bing, Li Bo
2003, 29(6): 548-551.
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As two major limitations to applying optical flow to motion estimation, oscillating of wavelet coefficients and cumulative error highly affected precision in calculation. It was proposed that an algorithm for estimating optical flow based on analytic wavelets that suppress the oscillating of wavelet...
Relationships for the Relative Motion of a Tensor Described in Any Two Rotational Reference Frame
Xing Xiaolan, Chen Wanchun, Yin Jian
2003, 29(6): 552-555.
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The definitions of the relative derivatives of a tensor with respect to time in any reference frame by using the notation of vectrix were proposed. It was shown that with the help of vectrix one can treat the relative derivatives of a tensor more clearly and more rigorously when multiple reference f...
Research on Control Problem and Controller of Parallel Robot
Yin Xufeng, Huan Ji
2003, 29(6): 556-560.
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The inverse kinematics problem and direct kinematics problem of a six branches parallel robot were studied. Their realizing technologies based on open CNC system, especially the real-time coordinate transformation based on the IKP algorithm and the system initialization based on the DKP algorithm we...
Property Estimation of Compound Armors by Small Sample Statistic Analysis
Zhang Zuoguang, Shen Jianming, Li Min, Sun Zhijie
2003, 29(6): 561-564.
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The critical non-penetrating area density under different non-penetrating probability and the critical penetrating velocity under different penetrating probability for different compound structure armors with a definite confidence level were presented by small sample two-dimension up and down method...

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