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浏览/检索结果: 共9条,第1-9条 帮助

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Computational fluid dynamics simulations of phase separation in dispersed oil-water pipe flows 期刊论文  OAI收割
CHEMICAL ENGINEERING SCIENCE, 2023, 卷号: 267, 页码: 18
作者:  
Chen, Jianhua;  Anastasiou, Charitos;  Cheng, Sibo;  Basha, Nausheen Mehboob;  Kahouadji, Lyes
  |  收藏  |  浏览/下载:30/0  |  提交时间:2023/02/24
Automatic procedure for selecting flood events and identifying flood characteristics from daily streamflow data 期刊论文  OAI收割
ENVIRONMENTAL MODELLING & SOFTWARE, 2021, 卷号: 145, 页码: 12
作者:  
Zhang, Qin;  Zhang, Liping;  She, Dunxian;  Wang, Shuxia;  Wang, Gangsheng
  |  收藏  |  浏览/下载:57/0  |  提交时间:2021/11/26
Advances in analytical chemistry using the unique properties of ionic liquids 期刊论文  OAI收割
TRAC-TRENDS IN ANALYTICAL CHEMISTRY, 2012, 卷号: 39, 页码: 218-227
Tan, Zhi-qiang; Liu, Jing-fu; Pang, Long
收藏  |  浏览/下载:32/0  |  提交时间:2014/11/04
Research on infrared dim-point target detection and tracking under sea-sky-line complex background (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者:  
Dong Y.-X.;  Zhang H.-B.;  Li Y.;  Li Y.;  Li Y.
收藏  |  浏览/下载:108/0  |  提交时间:2013/03/25
Target detection and tracking technology in infrared image is an important part of modern military defense system. Infrared dim-point targets detection and recognition under complex background is a difficulty and important strategic value and challenging research topic. The main objects that carrier-borne infrared vigilance system detected are sea-skimming aircrafts and missiles. Due to the characteristics of wide field of view of vigilance system  the target is usually under the sea clutter. Detection and recognition of the target will be taken great difficulties.There are some traditional point target detection algorithms  such as adaptive background prediction detecting method. When background has dispersion-decreasing structure  the traditional target detection algorithms would be more useful. But when the background has large gray gradient  such as sea-sky-line  sea waves etc.The bigger false-alarm rate will be taken in these local area.It could not obtain satisfactory results. Because dim-point target itself does not have obvious geometry or texture feature  in our opinion  from the perspective of mathematics  the detection of dim-point targets in image is about singular function analysis.And from the perspective image processing analysis  the judgment of isolated singularity in the image is key problem. The foregoing points for dim-point targets detection  its essence is a separation of target and background of different singularity characteristics.The image from infrared sensor usually accompanied by different kinds of noise. These external noises could be caused by the complicated background or from the sensor itself. The noise might affect target detection and tracking. Therefore  the purpose of the image preprocessing is to reduce the effects from noise  also to raise the SNR of image  and to increase the contrast of target and background. According to the low sea-skimming infrared flying small target characteristics  the median filter is used to eliminate noise  improve signal-to-noise ratio  then the multi-point multi-storey vertical Sobel algorithm will be used to detect the sea-sky-line  so that we can segment sea and sky in the image. Finally using centroid tracking method to capture and trace target. This method has been successfully used to trace target under the sea-sky complex background. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
氢气渗透Nb基合金的设计及特性表征 期刊论文  OAI收割
RARE METAL MATERIALS AND ENGINEERING, 2010, 卷号: 39, 期号: 6, 页码: 5,1045-1049
作者:  
Yan Changfeng (闫常峰);  Luo Weimin (罗伟民)
收藏  |  浏览/下载:32/0  |  提交时间:2014/12/31
Dispersion compensating properties of microstructure fiber (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Communication, August 21, 2005 - August 26, 2005, Changshun, China
作者:  
Li C.;  Wang W.;  Wang W.;  Li C.;  Li C.
收藏  |  浏览/下载:25/0  |  提交时间:2013/03/25
Microstructure fiber is a new kind of optical fiber. An arrangement of air holes running along the full length of the fiber provides the confinement and guidance of light. The light is confined in the silica core along the fiber axis. This fiber has endlessly single mode  special dispersion characteristics and so on. Using a vectorial effective-index numerical method  we investigated the dispersion characteristics of a microstructure fiber with honeycomb cladding structures. The dispersion  dispersion slope  and Kappa parameter can be designed neatly by changing the air hole size and the separation of the holes in fiber cladding. We demonstrated the Microstructure fiber with large absolute value of normal dispersion and negative dispersion slope at the wavelength of 1550nm. Conventional communication non-shifted single-mode fibers and nonzero-dispersion shifted fibers (NZ-DSF) can be compensated efficiently using the microstructure fiber at the wavelength around 1550nm.  
Analysis of alignment error in asphere testing using a corrector (EI CONFERENCE) 会议论文  OAI收割
Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states
作者:  
Xue D.-L.;  Zhang X.-J.;  Zheng L.-G.
收藏  |  浏览/下载:22/0  |  提交时间:2013/03/25
Photoluminescence of self-assembled InAs/GaAs quantum dots covered by InAlAs and InGaAs combination strain-reducing layer 期刊论文  OAI收割
chinese physics letters, 2003, 卷号: 20, 期号: 11, 页码: 2061-2063
Fang ZD; Gong Z; Miao ZH; Xu XH; Ni HQ; Niu ZC
收藏  |  浏览/下载:73/0  |  提交时间:2010/08/12
Numerical Study of U-beam Inertial Separator 期刊论文  OAI收割
JOURNAL OF THERMAL SCIENCE, 2001, 卷号: 10, 期号: 3, 页码: 264268
L.H. Chen; J.R. Fan; K.F. Cen
收藏  |  浏览/下载:12/0  |  提交时间:2013/03/12