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Stationary distributions and ergodicity of reflection-type Markov chains 期刊论文  OAI收割
STATISTICS & PROBABILITY LETTERS, 2022, 卷号: 189, 页码: 8
作者:  
Liu, Yujie
  |  收藏  |  浏览/下载:24/0  |  提交时间:2023/02/07
Lead discovery, chemical optimization, and biological evaluation studies of novel histone methyltransferase SET7 small-molecule inhibitors 期刊论文  OAI收割
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS, 2020, 卷号: 30, 期号: 9, 页码: 10
作者:  
Hou, Zeng;  Min, Wenjian;  Zhang, Rukang;  Niu, Ao;  Li, Yuanqing
  |  收藏  |  浏览/下载:64/0  |  提交时间:2020/07/01
Computational discovery and biological evaluation of novel inhibitors targeting histone-lysine N-methyltransferase SET7 期刊论文  OAI收割
BIOORGANIC & MEDICINAL CHEMISTRY, 2020, 卷号: 28, 期号: 7, 页码: 10
作者:  
Min, Wenjian
  |  收藏  |  浏览/下载:36/0  |  提交时间:2020/07/01
Droplet rebound phenomenon under sudden decrease of gravity 会议论文  OAI收割
Beijing, China, September 23, 2013 - September 27, 2013
作者:  
Zhang L(张良);  Zhao JF(赵建福)
  |  收藏  |  浏览/下载:40/0  |  提交时间:2018/11/08
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:39/0  |  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.  
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:38/0  |  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).  
A study on atmospheric turbulence effects in full-optical free-space communication systems (EI CONFERENCE) 会议论文  OAI收割
2010 6th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2010, September 23, 2010 - September 25, 2010, Chengdu, China
作者:  
Liu P.
收藏  |  浏览/下载:34/0  |  提交时间:2013/03/25
Next generation free-space optical communication systems have used fiber-optic technology as the seamless connection between free-space and optical fiber. The full-optical free-space optical communication systems use optical fiber as the receiver to get faster communication speed. The atmospheric turbulence deeply influenced on the optical wave propagated in terrestrial application. As the active receiving area of the full-optical free-space optical communication systems is very small  it is important to research on the atmospheric turbulence effects on the full-optical free-space optical communication system. In this paper  we discuss about both the turbulence-induced intensity fluctuations and the angle-of-arrival effects in full-optical free-space optical communication systems which are used in a few kilometers communication. We gave the numerical results of the atmosphere turbulence effects on the free-space optical communication systems. In order to minimize the atmospheric turbulence influence on the full-optical free-space optical communications system  we also investigate the use of fine tracking system in the communication system. We have set up a full-optical free-space communication system in Tokyo and received useful data from the experiment. We compared the receiving power of the experiment  when the fine tracking system is On and Off. From the experiment results  we can see that the fine tracking system effectively mitigates the atmospheric turbulence and increases the receiving power of the communication system. 2010 IEEE.  
Alignment of off-axis asphere and compensator with four poles (EI CONFERENCE) 会议论文  OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
作者:  
Li J.;  Chen Y.;  Li J.;  Li J.;  Wang P.
收藏  |  浏览/下载:68/0  |  提交时间:2013/03/25
Aspheres are utilized widely thanks to the development of optical design  manufacture and testing. Compensators are usually necessary when aspheres are under test. The alignment of aspheres and their compensators is a risk because it's tough to check whether the compensators work in right way. A new method of alignment with four poles is put forward in this paper. Optical interval error can be tight while it is quite important due to direct influence on central curvature  conic constant and high order coefficients of aspherical surface. A modified on-axis Foucault apparatus is set up since it makes the optical axis visible and helps to control the error of off-axis amount. Some small holes are drilled in the metallic cell of the compensator so that the ends of poles can be stably relied on in order to increase operational repeatability. The method has been carried out practically and it matches the measurement result given by a set of theodolites. 2009 SPIE.