中国科学院机构知识库网格
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浏览/检索结果: 共8条,第1-8条 帮助

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新疆农田化肥施用现状调查与评价/Investigation and Evaluation of the Chemical Fertilizer Application Situation of Farmland in Xinjiang[J] 期刊论文  OAI收割
干旱区研究, 2014, 卷号: 31, 期号: 6, 页码: 1024-1030
作者:  
赖波;  汤明尧;  柴仲平;  陈波浪;  李青军
  |  收藏  |  浏览/下载:99/0  |  提交时间:2017/12/29
Accuracy synthesis of a 3-RPS parallel robot based on manufacturing costs (EI CONFERENCE) 会议论文  OAI收割
31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China
Yao T.-K.; Xi Z.; Feng Z.; Zhang L.-M.; Yong W.
收藏  |  浏览/下载:32/0  |  提交时间:2013/03/25
Pose accuracy is an important issue for parallel robot being used as mirror supporting system of telescope. One challenging topic is the accuracy synthesis which deals with the optimal design of the manufacturing and assembling tolerances of each component under the given pose accuracy. First  the error model of the 3-RPS parallel robot is built based on total derivation of the kinematic equations. And the error variable of each spherical or rotate joint can be expressed as a single boundary error parameter but not three independent position parameters. Then  the accuracy synthesis model is formulated taking the manufacturing costs as the optimization objective and the accuracy requirements as the constraint condition. Finally  the genetic algorithm is used to solve the optimization problem and a simulation example is given. The results show that the accuracy synthesis method based on manufacturing costs can satisfy the need of pose accuracy and is better for engineering application than the method based on error sensitivity. 2012 Chinese Assoc of Automati.  
Research on model reference sliding mode control in roll stabilization of aerocraft (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Chu H.-R.
收藏  |  浏览/下载:40/0  |  提交时间:2013/03/25
Aimed at aerospace roll stabilization  control arithmetic based on model reference sliding mode variable structure theory and chattering reduction arithmetic are formulated. Correctness and validity of arithmetic are analyzed. With flight dynamics  the roll-loop mathematic model and reference model are established. Sliding hyperplane is deduced based on model reference sliding mode variable structure theory. Combing with reaching law  control law is derived  and stability of roll-loop is analyzed. Chattering of aileron instructions is alleviate by using boundary layer approach. Digital flying simulation result shows that variable structure control arithmetic realized roll stabilization control  the roll angle is less than 5.3 under powered flight  and that of unpowered flight is less than 0.5  respectively. The command fin angle is less than 1.5. High frequency chattering of fin command nearby the minimum velocity was trailed off by chattering reduction arithmetic. The sliding mode control arithmetic show good performance when aerodynamic coefficients varies 20%. The control arithmetic is easy to be implemented for its simplicity. 2011 IEEE.  
Study particle filter tracking and detection algorithms based on DSP signal processors (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Dong Y.; Chuan W.
收藏  |  浏览/下载:20/0  |  提交时间:2013/03/25
In Video tracking  detection and tracking usually need two algorithms. The process is complex and need much time which detection and tracking are. In this paper a hybrid valued sequential state vector is formulated. The state vector is characterized by information of target appearance flag and of location. Particle filter-based method implements detection and tracking at one time. In order to reduce process time and think of pixel position in tracking field  feature histogram of luminance is as observe vector and used posterior estimate. In this paper  the luminance component is derived and target is recognized and tracked through image processor based on DSP in order to implementing real-time. The experimental results confirm that method can detect and track the object in real-time successfully when the number of particles is 160. The method is robust for rolling  scale and partial occlusion. 2010 IEEE.  
Study on color image tracking and detection algorithms based on particle filter (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, June 17, 2009 - June 19, 2009, Beijing, China
Wu C.; Sun H.-J.; Yang D.
收藏  |  浏览/下载:20/0  |  提交时间:2013/03/25
药物的能量理论和中药有效组份的能量协同作用机制 期刊论文  OAI收割
Chinese Traditional and Herbal Drugs, 2003, 卷号: 34, 期号: 10, 页码: 865-868
作者:  
张亚刚;  吾满江·艾力
收藏  |  浏览/下载:18/0  |  提交时间:2012/11/29
FEM ANALYSIS ON MIXED-MODE FRACTURE OF CSM-GRP 期刊论文  OAI收割
Applied Mathematics and Mechanics(English Edition), 1986, 期号: 8, 页码: 741-753
作者:  
Zhang SY(张双寅);  Leech CM
收藏  |  浏览/下载:21/0  |  提交时间:2015/09/14
AN INTERMEDIATE BOSON THEORY 期刊论文  OAI收割
A Semi-monthly Journal of Science(Foreign Language Edition), 1966, 期号: 10, 页码: 444-446
作者:  
Yang GC(杨国琛);  Luo LF(罗辽复);  Lu T(陆埮)
收藏  |  浏览/下载:19/0  |  提交时间:2017/03/21