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浏览/检索结果: 共9条,第1-9条 帮助

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Preliminary Design of Pulse Inductor Applied for 100-kA Quench Protection System 期刊论文  OAI收割
IEEE TRANSACTIONS ON PLASMA SCIENCE, 2020, 卷号: 48
作者:  
Tong, Wei;  Li, Chuan;  Song, Zhiquan;  Fu, Peng;  Qian, Chengjin
  |  收藏  |  浏览/下载:140/0  |  提交时间:2020/10/26
双极器件LPNP辐照损伤效应的并行有限元数值模拟 期刊论文  OAI收割
系统仿真学报, 2020, 卷号: 32, 期号: 12, 页码: 2376-2382
作者:  
王芹;  马召灿;  李鸿亮;  张林波;  卢本卓
  |  收藏  |  浏览/下载:24/0  |  提交时间:2021/04/26
Influence of low temperature on the surface deformation of deformable mirrors 期刊论文  OAI收割
Chinese Physics B, 2017, 卷号: 26, 期号: 5, 页码: 054215
作者:  
You, Juncheng;  Guan, Chunlin;  Zhou, Hong
  |  收藏  |  浏览/下载:25/0  |  提交时间:2018/11/20
Strain-rate-dependent microplane model for high-rate comminution of concrete under impact based on kinetic energy release theory 期刊论文  OAI收割
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2015, 卷号: 471, 期号: 2182, 页码: 20150535
作者:  
Kirane K;  Su YW(苏业旺);  Bazant ZP
收藏  |  浏览/下载:45/0  |  提交时间:2016/01/07
Micro-electro-mechanical systems capacitive ultrasonic transducer with a higher electromechanical coupling coefficient 期刊论文  OAI收割
Micro & Nano Letters, 2015, 卷号: 10, 期号: 10, 页码: 4
作者:  
Miao, J(苗静);  Shen, WJ(沈文江);  He, CD;  Xue, CY;  Xiong, JJ
收藏  |  浏览/下载:88/0  |  提交时间:2015/12/31
silicon  elemental semiconductors  silicon-on-insulator  wafer bonding  electromechanical effects  ultrasonic transducers  capacitive transducers  micromechanical devices  micromachining  vibrations  membranes  finite element analysis  reliability  capacitance  electromechanical coupling coefficient  capacitive micromachined ultrasonic transducer  impedance matching  propagation medium  microelectromechanical system capacitive ultrasonic transducer  silicon on insulator  wafer bonding  optimum geometric dimensions  membrane mechanical vibration  electrical characteristics  finite-element analysis  operation mode  device safety  device reliability  equivalent stress  operation-collapse voltage  bottom electrodes  glass substrate surface  parallel parasitic capacitance  Si  SiO2  
Fabrication of an oxidation-resistant beta-NiAl coating on gamma-TiAl 期刊论文  OAI收割
Surface & Coatings Technology, 2012, 卷号: 206, 期号: 8-9, 页码: 2454-2458
H. Zhang; X. Peng; F. Wang
收藏  |  浏览/下载:25/0  |  提交时间:2013/02/05
Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu S.; Yan Y.; Xu K.; Jin G.
收藏  |  浏览/下载:47/0  |  提交时间:2013/03/25
With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.  
The atomic structure and the properties of Ununbium (Z=112) and Mercury (Z=80) 期刊论文  OAI收割
SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY, 2007, 卷号: 50, 页码: 707-715
作者:  
Li JiGuang;  Dong ChenZhong;  Yu YouJun;  Ding XiaoBin;  Fritzsche, S.
  |  收藏  |  浏览/下载:20/0  |  提交时间:2018/07/16
Design and analysis of large spaceborne light-weighted primary mirror and its support system (EI CONFERENCE) 会议论文  OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yan Y.; Jin G.; Yang H.-B.
收藏  |  浏览/下载:17/0  |  提交时间:2013/03/25
With the development of the resolution of spaceborne remote sensor  the diameter of the primary mirror of spaceborne telescope becomes larger and larger. The distortion of primary mirror which is influenced by the mirror material  structure  self-weight  support system and temperature environment affects optical image quality finally. In this paper  an on-axis TMA high-resolution Cassegrain optical payload with a primary mirror whose diameter is 650mm was designed and the effects of the influence factors of the distortion acts on the on-axis TMA optical system primary mirror had been analyzed by means of Finite Element Analysis. During work  the technology of the primary mirror design had been summarized and general consideration of the primary mirror design technology also had been described at the same time. Considering the telescope manufacture and work station  a reasonable and optimal structure of the primary mirror sub-assembly is taken finally. In the end  the distortion of the primary mirror during its fabrication station and work station had been analyzed by integrated Finite Element Analysis Method. The results implicated the synthesis profile error (P-V value) for the primary mirror is less than /10 and all the indexes of the primary mirror satisfy the requirements of the optical system.