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浏览/检索结果: 共4条，第1-4条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Mechanism of STED microscopy and analysis of the factors affecting resolution (EI CONFERENCE) 会议论文 6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China Yang P.; Ai H. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 Stimulated emission depletion (STED) microscopy exploits nonlinear saturable optical transition of fluorescent molecules  allowed to overcome Abbe's diffraction-limit and provides diffraction-unlimited resolution in far-field optical microscopy. We elaborate the mechanism of STED and the conditions of depletion. The formula of STED microcopy resolution is deduced through effective point spread function (E-PSF). The STED system resolution is mainly dominated by the quality of the fluorescence depletion patterns in the focal plane. The depletion pattern is mainly affected by STED beam intensity  polarization  phase plate  primary aberrations  STED pulse shape  pulse duration and delay time. In this paper  we found related models and simulate the relationship between the depletion patterns and the parameters  and put forward effective approach to enhance the system resolution. 2010 SPIE.   Chirp estimation of PZT for integrating-bucket method (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China Zhang J.; Shi Z.; Miao E.; Gu Y.; Liu W. 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25 The nonlinear response of the PZT for the integrating bucket method is studied by our proposed method: discrete chirp Fourier transform (DCFT) and maximum likelihood estimation (MLE) techniques for the integrating bucket method. Based on the signal processing theory  the intensity obtained from CCD is processed by the DCFT and thus nonlinear response and chirp coefficient of the PZT can be coarsely estimated. This is followed by the MLE method  in which an iterative optimization process is complemented for accurately estimating the nonlinear response and chirp coefficient of the PZT. One key advantage of the proposed method is that not only the nonlinear response and chirp coefficient of the PZT can be acquired  but also initial phase acquired. Our method is tested by simulating conditions under which a certain magnitude of nonlinearity is assumed. Nonlinear response attained by the DCFT is compared to that attained by the MLE  and a difference between the actual nonlinear response of the PZT and our accurate estimation by the proposed method is revealed. Several factors that will have influence on the nonlinear response of the PZT are discussed. 2010 Copyright SPIE - The International Society for Optical Engineering.   CORRELATION OF DEFORMATION DEMANDS WITH GROUND MOTION INTENSITY IN NEAR-FIELD MOTIONS 会议论文 第十一届结构工程国际研讨会, 广州, 2010 作者:  Wei-Jian Yi;  Hai-Ming Zhang 收藏  |  浏览/下载：5/0  |  提交时间：2020/01/05 Near-field  motions  Maximum  interstory  drift  ratio  Ground  motion  intensity  parameter  Correlation  analyses  Nonlinear  analyses  Frame  structures   CORRELATION OF DEFORMATION DEMANDS WITH GROUND MOTION INTENSITY IN NEAR-FIELD MOTIONS 会议论文 PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON STRUCTURAL ENGINEERING, VOL I AND II, 228-233, 2010 作者:  Yi, WJ;  Zhang, HM 收藏  |  浏览/下载：0/0  |  提交时间：2020/01/05 Near-field motions  Maximum interstory drift ratio  Ground motion intensity parameter  Correlation analyses  Nonlinear analyses  Frame structures