机构

• 数学与系统科学研究院 [4]
• 长春光学精密机械与物... [3]
• 西安光学精密机械研究... [2]
• 遥感与数字地球研究所 [1]
• 国家天文台 [1]

采集方式

• OAI收割 [11]

内容类型

• 期刊论文 [7]
• 会议论文 [4]

发表日期

• 2021 [1]
• 2020 [2]
• 2017 [1]
• 2016 [3]
• 2013 [1]
• 2012 [1]
• 更多

学科主题

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浏览/检索结果: 共11条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 CONVERGENCE OF DZIUK'S FULLY DISCRETE LINEARLY IMPLICIT SCHEME FOR CURVE SHORTENING FLOW 期刊论文  OAI收割 SIAM JOURNAL ON NUMERICAL ANALYSIS, 2021, 卷号: 59, 期号: 6, 页码: 2823-2842 作者:  Ye, Changqing;  Cui, Junzhi   |  收藏  |  浏览/下载：23/0  |  提交时间：2022/04/02 curve shortening flow  fully discrete  linearly implicit  convergence  error estimate   A second-order and nonuniform time-stepping maximum-principle preserving scheme for time-fractional Allen-Cahn equations 期刊论文  OAI收割 JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 卷号: 414, 页码: 16 作者:  Liao, Hong-lin;  Tang, Tao;  Zhou, Tao   |  收藏  |  浏览/下载：29/0  |  提交时间：2020/06/30 Time-fractional Allen-Cahn equation  Alikhanov formula  Adaptive time-stepping strategy  Discrete maximum principle  Sharp error estimate   Dynamic surface parameter analysis for frequency response of tip/tilt mirror 期刊论文  OAI收割 OPTIK, 2020, 卷号: 203 作者:  Xu, Guangzhou   |  收藏  |  浏览/下载：26/0  |  提交时间：2020/07/20 Tip/tilt mirror  Dynamic surface parameter  Discrete error  Opto-mechanical integrated simulation   Superconvergence of Finite Element Approximations for the Fractional Diffusion-Wave Equation 期刊论文  OAI收割 JOURNAL OF SCIENTIFIC COMPUTING, 2017, 卷号: 72, 期号: 3, 页码: 917-935 作者:  Ren, Jincheng;  Long, Xiaonian;  Mao, Shipeng;  Zhang, Jiwei   |  收藏  |  浏览/下载：34/0  |  提交时间：2018/07/30 Fractional diffusion-wave equation  Finite element method  Fully discrete scheme  Error estimate   FINITE ELEMENT APPROXIMATIONS OF PARABOLIC OPTIMAL CONTROL PROBLEMS WITH CONTROLS ACTING ON A LOWER DIMENSIONAL MANIFOLD 期刊论文  OAI收割 SIAM JOURNAL ON NUMERICAL ANALYSIS, 2016, 卷号: 54, 期号: 2, 页码: 1229-1262 作者:  Gong, Wei;  Yan, Ningning   |  收藏  |  浏览/下载：19/0  |  提交时间：2018/07/30 finite element method  parabolic equation  optimal control problem  moving manifold  fully discrete error estimates   High-precision algorithm of surface parameter of parabolic primary mirror for space solar telescope 期刊论文  OAI收割 OPTIK, 2016, 卷号: 127, 期号: 22, 页码: 10687-10696 作者:  Xu, Guangzhou;  Ruan, Ping;  Yang, Jianfeng;  Li, Fu;  Yan, Xingtao 收藏  |  浏览/下载：27/0  |  提交时间：2017/03/02 Space solar telescope  Discrete error  Surface parameter  Rigid body displacement   High-precision algorithm of surface parameter of parabolic primary mirror for space solar telescope 期刊论文  OAI收割 optik, 2016, 卷号: 127, 期号: 22, 页码: 10687-10696 作者:  Xu, Guangzhou;  Ruan, Ping;  Yang, Jianfeng;  Li, Fu;  Yan, Xingtao 收藏  |  浏览/下载：60/0  |  提交时间：2016/10/12 Space solar telescope  Discrete error  Surface parameter  Rigid body displacement   Centroid localization algorithm based on bicubic interpolation gray square weighted (EI CONFERENCE) 会议论文  OAI收割 2012 3rd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2012, December 22, 2012 - December 23, 2012, Beihai, China 作者:  Zhou J. 收藏  |  浏览/下载：152/0  |  提交时间：2013/03/25 The 3D coordinates of measured point is embodied in 2D image coordinate of the optical characteristic point via the visual measurement system. Based on the gray square weighted centroid localization algorithm  the paper presents bicubic interpolation gray square weighted centroid localization algorithm  increases the number of effective pixels around the optical characteristic point imaging center  and reduces noise error via the gray square weighted  improves the imaging center location accuracy of optical characteristic point  realizes the accurate location of the optical characteristic points. Results indicate application of the proposed algorithm to location  the standard tolerance along the direction of x is 0.0022 Pixel  the standard tolerance along the direction of y is 0.0023 Pixel  compared with the others  the standard tolerance is minimum and discrete to a lesser degree distancing ideal image point  that is  the proposed algorithm has higher location accuracy. The maximum tolerance along the direction of x is 0.008 Pixel  the one along the direction of y is 0.007 Pixel  compared with the other two algorithms  the maximum tolerance is minimum.Results indicate that the stability of the proposed algorithm is better. (2013) Trans Tech Publications  Switzerland.   Trajectory tacking control of a quad-rotor based on active disturbance rejection control (EI CONFERENCE) 会议论文  OAI收割 2012 IEEE International Conference on Automation and Logistics, ICAL 2012, August 15, 2012 - August 17, 2012, Zhengzhou, China Gong X.; Tian Y.; Bai Y.; Zhao C. 收藏  |  浏览/下载：31/0  |  提交时间：2013/03/25 The objective of this paper is to deal with a trajectory tracking of a Quad-rotor unmanned aerial vehicle (UAV). For the model uncertainty  the external disturbance and the coupling factor are considered  an active disturbance rejection control (ADRC) algorithm is introduced into the designing procedure. The aircraft dynamic model is proposed in this article  based on which the closed-loop control system is divided into four independent channels with the coupling factor compensated by the extended state observer (ESO). The nonlinear state error feedback (NLSEF) algorithm is designed in each channel to improve the closed-loop dynamics. In this article  the ADRC controller is expressed in the discrete form. And finally  the simulation results show that the proposed control algorithm achieves a favourable tracking performance. 2012 IEEE.   Simulation and experiment of the static FTIR based on micro multi-step mirrors (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China 作者:  Liang Z.-Z.;  Zhang J.;  Zhang J.;  Zhang J.;  Zhu W.-B. 收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25 In recent years  Fourier transform spectrometer (FTS) with small size and low mass is required in many applications with growing need for real-time and small platform spectral detection. In this paper  a micro Fourier transform infrared spectrometer (FTIR) based on spatial modulation mode was designed. This spectrometer has the advantages of high stability and simplified configuration. It also promises optical path differences (OPD) with high precision  as MOEMS technology is used in manufacturing the key components. The simulation and the experiments with regard to this FTIR configuration have been done. Firstly  the diffraction effect of the micro multi-step mirrors (MMSMs) is studied. We discuss the influence to the reversed spectrum by different mirror widths and different diffraction distances. Secondly  we simulate and analyze the influence of the source solid angle to the spectral resolution. Thirdly  we set up the theoretical model of the collimation error which is mainly from the defocus of the optical system and analyze the result caused by the collimation error. Fourthly  a new discrete Fourier transform arithmetic using least-squares cosines progression (LSCP) is proposed which can reconstruct the spectrum with nonuniform sampled signals. Finally  the MMSMs are fabricated used the MOEMS technology and the structural parameters are tested. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).