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基于极径法球径测量的测量点布局设计 被引量:2
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作者 赵前程 邓善熙 崔文泉 《计量学报》 CSCD 北大核心 2002年第1期21-25,共5页
本文给出基于极径法球径测量的加权最小二乘估计模型 ,并依据该模型进行球面上测量采样点布局的优化设计。最后 。
关键词 球径测量 加权最小二乘估计 极经法 测量点 布局设计 球形零件 数据处理模型
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Backlash Nonlinear Compensation of Servo Systems Using Backpropagation Neural Networks 被引量:2
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作者 何超 徐立新 张宇河 《Journal of Beijing Institute of Technology》 EI CAS 1999年第3期300-305,共6页
Aim To eliminate the influences of backlash nonlinear characteristics generally existing in servo systems, a nonlinear compensation method using backpropagation neural networks(BPNN) is presented. Methods Based on s... Aim To eliminate the influences of backlash nonlinear characteristics generally existing in servo systems, a nonlinear compensation method using backpropagation neural networks(BPNN) is presented. Methods Based on some weapon tracking servo system, a three layer BPNN was used to off line identify the backlash characteristics, then a nonlinear compensator was designed according to the identification results. Results The simulation results show that the method can effectively get rid of the sustained oscillation(limit cycle) of the system caused by the backlash characteristics, and can improve the system accuracy. Conclusion The method is effective on sloving the problems produced by the backlash characteristics in servo systems, and it can be easily accomplished in engineering. 展开更多
关键词 servo system backlash nonlinear characteristics limit cycle backpropagation neural networks(BPNN) compensation methods
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Quasi-Classical Trajectory Study on O++DH(v=0,j=0)→OD++H Reaction at Different Collision Energy
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作者 孙海竹 刘新国 +1 位作者 吕娟娟 刘会荣 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第5期521-526,621,共7页
The quasi-classical trajectory calculations O++DH(v=0,j=0)→OD++H reactions on the RODRIGO potential energy surface have been carried out to study the isotope effect on stereo-dynamics at the collision energies ... The quasi-classical trajectory calculations O++DH(v=0,j=0)→OD++H reactions on the RODRIGO potential energy surface have been carried out to study the isotope effect on stereo-dynamics at the collision energies of 1.0, 1.5, 2.0, and 2.5 eV. The distributions of dihedral angle P(~r) and the distributions of P(Or) are discussed. Furthermore, the angular distributions of the product rotational vectors in the form of polar plot in θr and φr are calculated. The differential cross section shows interesting phenomenon that the reaction is dominated by the direct reaction mechanism. Reaction probability and reaction cross section are also calculated. The calculations indicate that the stereo-dynamics properties of the title reactions are sensitive to the collision energy. 展开更多
关键词 Stereo-dynamics Quasi-classical trajectory method Polarization-dependentdifferential cross-section
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Reliability-based design optimization for flexible mechanism with particle swarm optimization and advanced extremum response surface method 被引量:1
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作者 张春宜 宋鲁凯 +2 位作者 费成巍 郝广平 刘令君 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2001-2007,共7页
To improve the computational efficiency of the reliability-based design optimization(RBDO) of flexible mechanism, particle swarm optimization-advanced extremum response surface method(PSO-AERSM) was proposed by integr... To improve the computational efficiency of the reliability-based design optimization(RBDO) of flexible mechanism, particle swarm optimization-advanced extremum response surface method(PSO-AERSM) was proposed by integrating particle swarm optimization(PSO) algorithm and advanced extremum response surface method(AERSM). Firstly, the AERSM was developed and its mathematical model was established based on artificial neural network, and the PSO algorithm was investigated. And then the RBDO model of flexible mechanism was presented based on AERSM and PSO. Finally, regarding cross-sectional area as design variable, the reliability optimization of flexible mechanism was implemented subject to reliability degree and uncertainties based on the proposed approach. The optimization results show that the cross-section sizes obviously reduce by 22.96 mm^2 while keeping reliability degree. Through the comparison of methods, it is demonstrated that the AERSM holds high computational efficiency while keeping computational precision for the RBDO of flexible mechanism, and PSO algorithm minimizes the response of the objective function. The efforts of this work provide a useful sight for the reliability optimization of flexible mechanism, and enrich and develop the reliability theory as well. 展开更多
关键词 reliability-based design optimization flexible robot manipulator artificial neural network particle swarm optimization advanced extremum response surface method
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APPLICATION OF NOISE REDUCTION METHOD BASED ON CURVELET THRESHOLDING NEURAL NETWORK FOR POLAR ICE RADAR DATA PROCESSING 被引量:1
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作者 Wang Wenpeng Zhao Bo Liu Xiaojun 《Journal of Electronics(China)》 2013年第4期377-383,共7页
Due to the demand of data processing for polar ice radar in our laboratory, a Curvelet Thresholding Neural Network (TNN) noise reduction method is proposed, and a new threshold function with infinite-order continuous ... Due to the demand of data processing for polar ice radar in our laboratory, a Curvelet Thresholding Neural Network (TNN) noise reduction method is proposed, and a new threshold function with infinite-order continuous derivative is constructed. The method is based on TNN model. In the learning process of TNN, the gradient descent method is adopted to solve the adaptive optimal thresholds of different scales and directions in Curvelet domain, and to achieve an optimal mean square error performance. In this paper, the specific implementation steps are presented, and the superiority of this method is verified by simulation. Finally, the proposed method is used to process the ice radar data obtained during the 28th Chinese National Antarctic Research Expedition in the region of Zhongshan Station, Antarctica. Experimental results show that the proposed method can reduce the noise effectively, while preserving the edge of the ice layers. 展开更多
关键词 Radar data processing Thresholding Neural Network (TNN) CURVELET Ice radar
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Neural adaptive PSD decoupling controller and its application in three-phase electrode adjusting system of submerged arc furnace 被引量:4
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作者 贺建军 刘郁乔 +1 位作者 喻寿益 桂卫华 《Journal of Central South University》 SCIE EI CAS 2013年第2期405-412,共8页
Taking three-phase electrode adjusting system of submerged arc furnace as study object which has nonlinear, time-variant, multivariable and strong coupling features, a neural adaptive PSD(proportion, sum and different... Taking three-phase electrode adjusting system of submerged arc furnace as study object which has nonlinear, time-variant, multivariable and strong coupling features, a neural adaptive PSD(proportion, sum and differential) dispersive decoupling controller was developed by combining neural adaptive PSD algorithm with dispersive decoupling network. In this work, the production technology process and control difficulties of submerged arc furnace were simply introduced, the necessity of establishing a neural adaptive PSD dispersive decoupling controller was discussed, the design method and the implementation steps of the controller are expounded in detail, and the block diagram of the controlled system is presented. By comparison with experimental results of the conventional PID controller and the adaptive PSD controller, the decoupling ability, adaptive ability, self-learning ability and robustness of the neural adaptive PSD dispersive decoupling controller have been testified effectively. The controller is applicable to the three-phase electrode adjusting system of submerged arc furnace, and it will play an important role for achieving the power balance of three-phrase electrodes, saving energy and reducing consumption in the process of smelting. 展开更多
关键词 PSD algorithm decoupling controller submerged arc furnace three phase electrode
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Clinical study of Taiji needling in treatment of peripheral facial neuritis 被引量:5
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作者 宋维健 杨丹 +9 位作者 贾天贵 冯子驹 岳良明 张雄 何刚 杨艳芳 曹礼 李兵 蒋定委 高冬梅 《World Journal of Acupuncture-Moxibustion》 CSCD 2017年第1期17-22,共6页
Objective To observe the clinical efficacy of Taiji needling in treatment of peripheral facial neuritis. Methods Sixty inpatients with peripheral facial neuritis were randomly divided into two groups: observation gro... Objective To observe the clinical efficacy of Taiji needling in treatment of peripheral facial neuritis. Methods Sixty inpatients with peripheral facial neuritis were randomly divided into two groups: observation group (Taiji needling group, n=30) and control group (conventional acupuncture group, n=30); the treatment was conducted once a day, which was not stopped until the patients were discharged from hospital after recovery. The curative effect was evaluated before and after treatment by applying the therapeutic outcome rating scale of peripheral facial neuritis (portmann scale). Results The improve merit of efficacy indices in the observation group was superior to that in the control group, and the difference was statistically significant (P〈0.05); the course of treatment was shortened in the observation group compared with the control group, and the difference was also statistically significant (P〈0.05). Conclusion The efficacy index of Taiji needling in treatment of peripheral facial neuritis is superior to that of conventional acupuncture, and Taiji needling can obviously shorten the course of treatment. 展开更多
关键词 Taiji needling conventional acupuncture peripheral facialneuritis
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Localized States of an Excess Electron in an Ionic Cluster
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作者 K.V.Grigorishin B.I.Lev 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第12期738-746,共9页
A theory of an electron affinity for an ionic cluster is proposed both in a quasiclassical approach and with quantization of a polarization electric field in a nanopartiele. A critical size of the cluster regarding in... A theory of an electron affinity for an ionic cluster is proposed both in a quasiclassical approach and with quantization of a polarization electric field in a nanopartiele. A critical size of the cluster regarding in formation of an electron's autolocalized state, dependencies of energy and radius of a polaron on a cluster's size are obtained by a variational method. It has been found that binding energy of the electron in the cluster depends on a eluster's radius but a radius of electron's auto-localization does not depend on the cluster's radius and it equals to the polaron radius in a corresponding infinity crystal. A bound state of the electron in a cluster is possible only if the duster's radius is more than the polaron radius. 展开更多
关键词 CLUSTER POLARON autolocalization phonon comfinement
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Fabrication of iridium oxide neural electrodes at the wafer level 被引量:2
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作者 ZHANG He PEI WeiHua +10 位作者 ZHAO ShanShan YANG XiaoWei LIU RuiCong LIU YuanYuan WU Xian GUO DongMei GUI Qiang GUO XuHong XING Xiao WANG YiJun CHEN HongDa 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第9期1399-1406,共8页
Electro-deposition, electrical activation, thermal oxidation, and reactive ion sputtering are the four primary methods to fabricate iridium oxide film. Among these methods, reactive ion sputtering is a commonly used m... Electro-deposition, electrical activation, thermal oxidation, and reactive ion sputtering are the four primary methods to fabricate iridium oxide film. Among these methods, reactive ion sputtering is a commonly used method in standard micro-fabrication processes. In different sputtering conditions, the component, texture, and electrochemistry character of iridium oxide varies considerably. To fabricate the iridium oxide film compatible with the wafer-level processing of neural electrodes, the quality of iridium oxide film must be able to withstand the mechanical and chemical impact of post-processing, and simultaneously achieve good performance as a neural electrode. In this study, parameters of sputtering were researched and developed to achieve a balance between mechanical stability and good electrochemical characteristics of iridium oxide film on electrode. Iridium oxide fabricating process combined with fabrication flow of silicon electrodes, at wafer-level, is introduced to produce silicon based planar iridium oxide neural electrodes. Compared with bare gold electrodes, iridium oxide electrodes fabricated with this method exhibit particularly good electrochemical stability, low impedance of 386 kW at 1 kH z, high safe charge storage capacity of 3.2 m C/cm^2, and good impedance consistency of less than 25% fluctuation. 展开更多
关键词 reactive ion sputtering iridium oxide wafer-level neural electrode
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