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Search Results: 1 - 10 of 307799 matches for " 王印典 "
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常压储罐底板腐蚀的漏磁检测与概率分析
李春树,柳曾,培
腐蚀科学与防护技术 , 2009,
Abstract: 采用概率数据处理方法,对储罐底板腐蚀的漏磁检测结果进行处理,得到底板最大腐蚀深度、平均点腐蚀深度、平均点腐蚀速率、最大点腐蚀速率和穿孔概率等参数,对储罐底板腐蚀程度进行了定量描述并预测储罐底板穿孔概率.利用上述检测和数据处理方法可以对设备局部腐蚀状况作出定量评估,并对设备寿命进行预测.
基于静态小波分解的多尺度SAR图像滤波
岳焕,郭华东,范 ,长林,杨 虎
中国图象图形学报 , 2002, DOI: 10.11834/jig.2002012363
Abstract: 由于雷达回波的相干性,合成孔径雷达(SAR)图象上存在着斑点噪声,因此,为消除这种噪声,提出了一种基于静态小波分解的硬阈值滤波方法,该方法首先将SAR图象分解至静态小波域,然后在静态小波域中将噪声的小波系数收缩至零,将此算法应用于ERS-1SAR图象斑点噪声滤波,并与基于Mallat分解的滤波算法和另外3种典型的SAR图象滤波算法进行比较,结果表明,该方法不仅可以有效地去除斑点噪声,并且可以保持SAR图象的精细纹理结构。
可见光引发的活性接枝聚合及其生物应用
,赵长稳,马育红,杨万泰
- , 2018, DOI: 10.13543/j.bhxbzr.2018.05.006
Abstract: 活性光接枝聚合具有步骤简单、反应活化能低、反应时间/区域易于控制的特点,是表面改性的重要方法。与紫外光引发体系相比,可见光辐照反应条件更加温和、副反应少、对生物活性物质无损害,在生物相关领域具有更广阔的应用前景。基于多年的研究基础,北京化工大学有机材料表面工程研究室近年来开发了基于硫杂蒽酮衍生物的可见光引发表面活性接枝新方法。本文系统介绍了相关方法涉及的反应机理及其在酶固定化、生物芯片及细胞包覆方面的应用,并对今后的发展前景予以展望。
Abstract:Photo-induced living graft polymerization has become one of most important surface modification methods due to its advantages of simple operation, low activation energy and spatial/temporal controllability. Compared to the more common UV initiation systems, visible light irradiation has lower energy and has no adverse effects on biologically active substances. Based on the results of two decades of research in the photografting field, researchers in Organic Materials Surface Science and Engineering Lab in Beijing University of Chemical Technology have developed a novel visible light-induced living graft polymerization strategy based on derivative of thioxanthone. Here we systematically describe the mechanism of this method and its application in enzyme immobilization, biochip formation and cell encapsulation. Finally, possible future developments in this field are discussed.
Unequal-interval data fusion algorithm for inertial/gravity matching integrated navigation system
Unequal-interval data fusion algorithm for inertial/gravity matching integrated navigation system

邓志红,卢文,,付梦
- , 2016, DOI: 10.15918/j.jbit1004-0579.201625.0305
Abstract: Inertial/gravity matching integrated navigation system can effectively improve the long-endurance navigation ability of underwater vehicles. Through the analysis of the matching process, the problem of unequal-interval in matching trajectory is addressed by an unequal-interval data fusion algorithm which is based on the unequal-interval characteristics analysis of the matching trajectory. Compared with previously available methods, the proposed algorithm improves the location precision. In conclusion, simulations of the integrated navigation system demonstrated the effectiveness and superiority of the proposed algorithm.
Inertial/gravity matching integrated navigation system can effectively improve the long-endurance navigation ability of underwater vehicles. Through the analysis of the matching process, the problem of unequal-interval in matching trajectory is addressed by an unequal-interval data fusion algorithm which is based on the unequal-interval characteristics analysis of the matching trajectory. Compared with previously available methods, the proposed algorithm improves the location precision. In conclusion, simulations of the integrated navigation system demonstrated the effectiveness and superiority of the proposed algorithm.
Detection of Lake Shoreline in SAR Image Based on Wavelet
基于二进小波变换的SAR图像湖岸线提取

FAN Dian,GUO Hua-dong,YUE Huan-yin,WANG Chang-lin,
,郭华东,岳焕,长林

遥感学报 , 2002,
Abstract: In the field of map production, flood surveillance, and change study of lakeshore, the lake shoreline must be detected. A new method is explored in this paper, which can detect the lake shoreline in SAR images. Using this method, The edge points are detected by Mallat' s Wavelet-based edge detection method firstly, and then the Gradient Vector Flow Active Contour Model is used to connect the edge points. The result of the experiment shows that method presented in this paper can restrain the interference of speckle noise, and detect the lake shoreline precisely.
MAGNETIC FLUX LEAKAGE INSPECTION AND PROBABILISTIC ANALYSIS ON CORROSION OF BOTTOM FLOOR FOR AN ATMOSPHERIC TANK
常压储罐底板腐蚀的漏磁检测与概率分析

LI Chun-shu,LIU Ceng-dian,WANG Yin-pei East China University of Science,Technology,Shanghai,
李春树
,柳曾,培

腐蚀科学与防护技术 , 2009,
Abstract: The tank floors are frequently corroded randomly with pits and local damages.Magnetic flux leakage inspection is the most effective means to detect corrosion on the surface of double sides of tank bottom plates.By using probabilistic theory,this paper discusses a method to deal with the results of the magnetic flux leakage inspection.The parameters including the maximum pitting depth,the average pitting depth,the average pitting rate,the maximum pitting rate and the pitting breakthrough probability were obt...
Multiscale Filtering of SAR Images Based on Stationary Wavelet Decomposition
基于静态小波分解的多尺度SAR图象滤波

YUE Huan yin,GUO Hua dong,FAN Dian,WANG Chang lin,YANG Hu,
岳焕
,郭华东,,长林,杨虎

中国图象图形学报 , 2002,
Abstract: Synthetic aperture radar(SAR) images are disturbed by a speckle noise depending on the signal(the ground reflectivity) due to the radar wave coherence. Images have a strong variability from one pixel to another reducing essentially the efficiency of the algorithms of object detection and classification. In this study, we propose to suppress this noise with a multiresolution analysis of the image. Because the Mallat decomposition can not preserve the translation invariance of an image, the filter in this paper is based on stationary wavelet decomposition. This method is used to an ERS 1 SAR image and then it is compared to a filter based on Mallat decomposition and three other classic SAR image filters, the results show that the presented approach has the advantage both in speckle suppression and the preservation of image details.
香港大屿山岛南岸沙坝海滩的动力地貌变化
,
地理学报 , 1997, DOI: 10.11821/xb1997S1019
Abstract: 深入海湾的沙坝海滩,其侵蚀与堆积主要表现为海滩泥沙的横向运动,纵向运动仅出现在潮汐通道附近。而在宽阔的海湾内,海滩横向与纵向的泥沙运动同样重要;沙坝海滩的形态随着海滩沿岸波高、沉积物特征和外滨地形的不同而变化。在东亚季风和香港当地的波浪和海岸输沙条件下,沙坝海滩具有冬季稳定、夏初堆积和夏末侵蚀的年变化。同时由于沉积物来源有限,海滩体积小,海滩对海岸环境的突然变化反应敏感,而具有无规律的变化。
高原鼠兔松果体超微结构的研究

兽类学报 , 1993,
Abstract: ?本文采用光镜和透射电镜对高原鼠兔松果体的形态结构进行了观察,并对其结构与功能的关系怍了初步探讨:1.高原鼠兔的松果体与其他哺乳动物的基本相似,包括深、浅两部分,两部分的细胞构筑及其形态基本一致,主要由松果体细胞、胶质细胞、神经细胞、微细血管和神经纤维组成。松果体细胞有明、暗两种,两种细胞胞质内均有丰富的线粒体、高尔基复合体、粗面和滑面内质网,以及游离核糖体,还可见极少数微管和脂滴等。2.松果体细胞内囊泡、微管和突触带的数量与细胞的分泌功能密切相关。3.松果体分泌物主要通过二种方式释放:(1)通过扩散和胞吐作用,将分泌物释放到细胞外或血管周隙;(2)分泌物直接进入第三脑室。
玛曲渔场几种裂腹鱼类脑的形态结构与真食性的相互关系
群?
水产学报 , 1987,
Abstract: 本文对极边扁咽齿鱼,黄河裸裂尻鱼、花斑裸鲤和厚唇重唇鱼进行了食性分析和脑的形态结构观察,并对脑结构和食性的关系作了初步探讨。认为这四种鱼类属于底层味觉食性鱼类,其中极边扁咽齿鱼和黄河裸裂尻鱼主要靠口腔、腭部味蕾觅食泥土和藻类,迷叶发达;厚唇重唇鱼主要靠触须寻找甲壳类为主的水底昆虫,面叶和小脑发达;花斑裸鲤的脑结构特征与其杂食性相适应。
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