中国科学院机构知识库网格系统: 检索

Time correlations in compressible isotropic turbulence 会议论文 OAI收割
23rd International Congress of Theoretical and Applied Mechanics, 中国北京/Beijing, China, 2012-08-19
作者: Li D; He GW(何国威); Zhang X(张星)

收藏 | 浏览/下载：30/0 | 提交时间：2014/04/02

compressible turbulence Time isotropic dilatational rescaling energy observed latter single found while mainly model without source well

A matching algorithm on statistical properties of Harris corner (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Information and Automation, ICIA 2011, June 6, 2011 - June 8, 2011, Shenzhen, China
作者: He B.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The fundamental goal of target recognition and video tracking is to match target template with source image. Most matching methods are based on image intensity or multi-feature points. And the latter method is more popular for its high accuracy and small calculation. Image Registration Based on Feature Points focus on effective feature extraction of image points and paradigm. Harris corner in the image rotation gray noise and viewpoint change conditions has an ideal match results is more recent application of one feature point. This paper extract the Harris corner deviation and covariance firstly experiments show that the two features exclusive then applied them to image registration for the first time. A set of actual images have shown this proposed method not only overcomes the complicated background gray uneven distribution problems but also pan and zoom the image has a good resistance. 2011 IEEE.

High accuracy star image locating and imaging calibration for star sensor technology (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: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

Today aircraft attitude measurement technology plays an important role in an aircraft system because it can provide orientation for aircraft in action. Lately star sensor technology used in aircraft attitude measurement has become more and more popular because of its high accuracy light weight without attitude accumulation errors and other advantages. There are three main steps for star sensor to measure aircraft attitude star image locating star identification and attitude tracking. The latter two steps are based on the accuracy of star image locating. So it's critical to make efforts to advance the accuracy of star image locating. Some imaging errors such as spherical aberration or coma aberration also have negative effect on the accuracy of star image locating of which the effect is necessarily reduced as well. At the beginning of this article the structure of star sensor hardware is introduced. Secondly three methods for star image locating are described specifically which are traditional centroid method Gauss quadric fitting method and improved Gauss quadric fitting method. Subsequently an imaging calibration method is described for the purpose of reducing the effect of imaging errors. Finally the experiment shows that the accuracy of the star sensor is 2-arc-second. 2010 SPIE.

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.

Micro-motion exposure method based on PZT piezoelectric ceramics (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, June 17, 2009 - June 19, 2009, Beijing, China
作者: Meng Z.; Meng Z.

收藏 | 浏览/下载：103/0 | 提交时间：2013/03/25

There mainly is laser digital photofinishing technique and digital photofinishing technique based on LCD consisting of TFT and LCOS in the digital photofinishing field at the present time. The former have a good many merit such as wide color gamut high processing rate large output size and high brightness but his cost is very high his maintain technique being comparatively complex that result in difficult use for people. The utilization ratio of the latter is low because of lower resolution and lower aperture ratio for LCD but the digital photofinishing based on LCD have lower cost and higher utilization ration being suitable for people's current standard of living. Considering above mentioned problem a micro-motion exposure method based on PZT piezoelectric ceramics used in digital image photofinishing is presented. The two-dimension micro-motion exposure system consisting of PZT piezoelectric ceramics LCD panel polarizing film and spring strip is designed. By means of PZT piezoelectric ceramics the LCD panel is removed about the one half of the pixel size of the LCD panel for four times from the original place at the same time imaging system is exposed four times at the printing paper. The software is used to control the time synchronization the exposure time and motion range of the LCD panel. The system has advantages such as shorter response time than 0.1seconds lesser motion error than 0.01 microns high stability and repeatability. Experimental results show that the proposed micro-motion exposure method improve the picture brightness and enlarge output size at the meantime reducing the cost of the system. 2009 SPIE.

STATIC AND SPHERICALLY SYMMETRIC DYON SOLUTIONS IN SU(N) GAUGE THEORY 期刊论文 OAI收割
A Monthly Journal of Science, 1983, 期号: 1, 页码: 328-332
作者: Ma ZQ(马中骐)

收藏 | 浏览/下载：8/0 | 提交时间：2015/12/10

gauge assumed adjoint infinity ordinary string 一诚 Olive latter inserted

TEST OF NEWTONIAN INVERSE SQUARE LAW AT LABORATORY DISTANCES 期刊论文 OAI收割
A Monthly Journal of Science, 1983, 期号: 5, 页码: 1328-1330
作者: Liu HY(刘宏亚); Zhang PH(张平华); Qin RX(秦荣先)

收藏 | 浏览/下载：27/0 | 提交时间：2015/12/10

gravitational Newtonian probably inverse possibility torque pointed correct torsion latter

A POSSIBLE SU(7)GRAND UNIFIED THEORY WITH FOUR GENERATIONS OF LIGHT FERMIONS 期刊论文 OAI收割
Scientia Sinica, 1981, 期号: 5, 页码: 1358-1365
作者: Ma ZQ(马中骐); Du DS(杜东生); Xue PY(薛丕友); Yue ZW(岳宗五)

收藏 | 浏览/下载：18/0 | 提交时间：2015/12/10

unified invariant broken latter gauge assignment hundreds symmetry generalize diagonal

AN ESTIMATION OF THE UPPER LIMIT OF PHOTON MAGNETIC MOMENT 期刊论文 OAI收割
A Monthly Journal of Science, 1981, 期号: 9, 页码: 860
作者: Tang XW(唐孝威); Li S(李士); Wang KB(王克斌)

收藏 | 浏览/下载：17/0 | 提交时间：2015/12/07

absolutely accelerating exceed latter photon absorber infer urate resonant deter

ON THE BOUND STATE EQUATION OF MESONS AND ITS SOLUTIONS 期刊论文 OAI收割
Science in China;Ser.A, 1978, 期号: 1, 页码: 44-61
作者: Xian DC(冼鼎昌); Wu JW(吴坚武); Ji S(计数); Gao L(高仑)

收藏 | 浏览/下载：10/0 | 提交时间：2015/12/07

kernel latter accordance harmonics spherical Bethe ladder meson expanded iteration