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浏览/检索结果: 共5条，第1-5条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 Observation of Higgs Boson Decay to Bottom Quarks 期刊论文 PHYSICAL REVIEW LETTERS, 2018, 卷号: 121, 页码: 121801 作者:  Sirunyan, A.M.;  Tumasyan, A.;  Adam, W.;  Ambrogi, F.;  Asilar, E. 收藏  |  浏览/下载：34/0  |  提交时间：2019/12/30 Germanium compounds  Statistics  Tellurium compounds  Charged leptons  Higgs Boson decay  Measured signals  Production process  Proton proton collisions  Signal strengths  Standard deviation  The standard model  Bosons   Predictive Valley-Peak Current Control of Isolated Bidirectional Dual Active Bridge DC-DC Converter 会议论文 作者:  Huang, Jun;  Wang, Yue;  Li, Zhuoqiang;  Lei, Wanjun 收藏  |  浏览/下载：2/0  |  提交时间：2019/12/02 Predictive valley-peak current control  Measured deviation  Stability property  DAB  Fast dynamic response   Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文 Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China Zhang H.-Y.; Zhao S.; Guo J.; Liu L.-S.; Tian Y.-Z. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 In order to lead the laser beam transmit in the atmosphere convergently  an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly  the laser was collimated by a beam expander  then the near-parallel laser beam was transmitted with a Galileo telescope system  and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform  so the focus of the system changed due to the tiny displacement of the concave lens. Secondly  the average power of the laser spot can be measured using power meter  the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly  the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer  then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image  then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above  the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm  it is 10.43% of the total diameter of the laser spot. At last  the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit  attenuation in the atmosphere  geometrical aberration of optical system  and the diffraction limit and the geometrical aberration are significant in the three factors above  so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.   Orientation error analysis of alt-alt photoelectric telescope (EI CONFERENCE) 会议论文 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 19, 2008 - November 21, 2008, Chengdu, China Han X.-B.; Zhang J.-X.; Zhao J.-Y.; Zhao Y.-Z.; Wu X.-X.; Wang Z.-C. 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25 In order to ascertain the effects of main errors of alt-alt photoelectric telescope on measurement accuracy  orientation error is analyzed.For analyzing optical  mechanical and electrical errors from measured target to telescope picture  we construct 7 coordinates such as:the earth's core coordinate  alt-alt coordinate  etc.  carry through 21 times coordinate transformation  form measuring equation with 26 variables. and we utilize Monte Carlo method to calculate the orientation error  analyze the effects of errors upon pointing. The result indicates that the measuring error standard deviation of alt-alt telescope is minimum value about 10? at the zenith zone. and the deviation increases with the rotation angles of longitude and latitude axes. The model and the method not only can analyze and synthesize the main errors  but also provide a reference to the whole design. 2009 SPIE.   Study and calibration of azimuth effect in multi-position strap-down north seeking system (EI CONFERENCE) 会议论文 7th World Congress on Intelligent Control and Automation, WCICA'08, June 25, 2008 - June 27, 2008, Chongqing, China Wang Z.; Zhao J.; Xie M.; Gao F.; Shen C. 收藏  |  浏览/下载：9/0  |  提交时间：2013/03/25 In order to reduce the influence of azimuth effect in multi-position strap-down north seeking system  its cause of formation is studied based on the precession principle of the dynamically tuned gyro. A detecting system  composed by true north prism  two Leica theodolites and benchmark prism fixed in the strap-down north seeking system  was designed to calibrate the azimuth effect. By two steps  many measurements are gone on in every position to eliminate the random error. According to the homologous between the error and the position  a sinusoid is made a fit as compensate curve after the error of twelve positions is measured. Then the azimuth effect of the arbitrary position can be corrected by the curve. The experiment result shows that the seeking north standard deviation is only 11.77 after compensation  which is considerably less than the 87.75 without correction. 2008 IEEE.