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浏览/检索结果: 共25条，第1-10条 帮助

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A compact symmetric radio source born at one-tenth the current age of the Universe 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2022, 卷号: 511, 期号: 3, 页码: 4572-4581
作者:  An, Tao;  Wang, Ailing;  Zhang, Yingkang;  Aditya, J. N. H. S.;  Hong, Xiaoyu
  |  收藏  |  浏览/下载：19/0  |  提交时间：2023/06/19
Modified scaling angular spectrum method for numerical simulation in long-distance propagation 期刊论文  OAI收割
CHINESE PHYSICS B, 2021, 卷号: 30, 期号: 3, 页码: 9
作者:  Chen, Xiao-Yi;  Duan, Ya-Xuan;  Xiang, Bin-Bin;  Li, Ming;  Da, Zheng-Shang
  |  收藏  |  浏览/下载：29/0  |  提交时间：2021/04/19
Modified scaling angular spectrum method for numerical simulation in long-distance propagation* 期刊论文  OAI收割
CHINESE PHYSICS B, 2021, 卷号: 30, 期号: 3, 页码: 034203
作者:  Chen, Xiao-Yi;  Duan, Ya-Xuan;  Xiang, Bin-Bin;  Li, Ming;  Da, Zheng-Shang
  |  收藏  |  浏览/下载：18/0  |  提交时间：2021/04/23
Research on edge enhancement of optical image based on acousto-optic filtering 会议论文  OAI收割
Xi'an, China, 2021-07-23
作者:  Chu, Yukun
  |  收藏  |  浏览/下载：48/0  |  提交时间：2022/01/21
Three-Dimensional Scene Encryption Algorithm Based on Phase Iteration Algorithm of the Angular-Spectral Domain 期刊论文  OAI收割
IEEE/CAA Journal of Automatica Sinica, 2020, 卷号: 7, 期号: 4, 页码: 1074-1080
作者:  Chao Han;  Yuzhen Shen
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/03/11
The angular velocity estimation principal of -- filter based on high sampling rate (EI CONFERENCE) 会议论文  OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者:  Zhang Y.
收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25
In order to get angular velocity of stabilization servo mechanism from angular position sensors  -- filter and its angular velocity transfer function were predigested. Combing with optimum parameters  -- filter based on high sampling rate was established  the effect of and sample rate on filter nature frequency were evaluated. According to the requirements of stabilization platform  the principle of steady and transient tracking filter differential were proved. With the hypothesis of constant acceleration  the frequency characteristics of angular velocity transfer function were analyzed  three-dimensional Kalman filter was simplified  and the filter parameters were designed. The results show that when the spectrum of input signal was lower than 6rad/s  parameters was 0.02  and sampling period were 0.08ms and 0.1ms respectively  the filter can realize differential exactly  when the spectrum was 9rad/s  the precision was no less than 1.1%  the phase leading of angular position was no less than 70  the natural frequency should be higher than the cut-off frequency of stabilization platform was two or three times. In the engineering of electro-optical stabilization servo mechanism  -- filter has properties of tracking differential  and reached the requirement of platform angular velocity estimation. Also it is one of the effective methods to get angular velocity from angular position sensors. 2011 IEEE.  
On the primordial trispectrum from exchanging scalar modes in general multiple field inflationary models 期刊论文  OAI收割
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2010, 期号: 11, 页码: -
作者:  Lin, Chunshan;  Gao, Xian;  Gao, XA , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, 55 Zhong Guan Cun E Rd, Beijing 100080, Peoples R China
  |  收藏  |  浏览/下载：18/0  |  提交时间：2012/08/02
A design of beam shaping unit for 193nm lithography illumination system using angular spectrum theory (EI CONFERENCE) 会议论文  OAI收割
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
作者:  Zhao Y.;  Zhang W.;  Zhang W.;  Li S.;  Gong Y.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Off-axis illumination (OAI) technology is widely used to enhance resolution for deep ultraviolet lithography. The realizing methods of OAI include geometrical optics method and physical optics method. However  the former has the disadvantage of weak intensity distribution controlling ability  and the latter introduces simulation errors evidently when dealing with near field diffraction propagation. A diffractive optical element (DOE) designing method using plane wave angular spectrum theory is presented in this paper. Several kinds of OAI modes at near field away from DOE can be realized  and simulation errors and the size of illuminator are also reduced. According to studying the relationships of the sampling point distance of DOE  light beam propagation distance  and the structure of the beam shaping unit  a method of determining the designing parameters is discussed. Using this method  several illumination modes are realized  and simulation results show that all diffraction efficiencies reach up to 84%. The method of DOE manufacturing is analyzed at last  and it is proven to be feasible. 2010 SPIE.  
On the primordial trispectrum from exchanging scalar modes in general multiple field inflationary models 期刊论文  OAI收割
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2010, 期号: 11
Gao, XA; Lin, CS
收藏  |  浏览/下载：21/0  |  提交时间：2013/09/24
Non-Gaussianity, isocurvature perturbation, gravitational waves, and a no-go theorem for the isocurvaton 期刊论文  OAI收割
PHYSICAL REVIEW D, 2009, 卷号: 79, 期号: 6, 页码: -
作者:  Li, M , Univ Sci & Technol China, Interdisciplinary Ctr Theoret Studies, Hefei 230026, Anhui, Peoples R China;  Li, Miao;  Lin, Chunshan;  Wang, Tower;  Wang, Yi
  |  收藏  |  浏览/下载：17/0  |  提交时间：2012/08/02