中国开放科研知识云: 检索

Diamond MIP structure Schottky diode with different drift layer thickness 会议论文
作者: Zhao, Dan; Hu, Chao; Liu, Zhangcheng; Wang, Hong-Xing; Wang, Wei

收藏 | 浏览/下载：2/0 | 提交时间：2019/11/26

CVD diamond Drift layer thickness Schottky diode Vertical structure

A novel gantry 5-axis milling-turning machine tool with four columns 会议论文
作者: Zha, Jun; Chen, Junyin; Zhang, Penghai; Chen, Yaolong

收藏 | 浏览/下载：12/0 | 提交时间：2019/11/26

5-axis milling Box structures Horizontal machining Large diameter Symmetrical structure Transformation matrices Turning machines Vertical direction

Automatic Recognition of Diseased Trees Based on the Vertical Structure of Airborne Point Clouds: A Case Study of Diseased Trees of Great Smoky Mountains 会议论文
作者: Ru, Wei; Wang, Yue; Hu, Qingwu

收藏 | 浏览/下载：3/0 | 提交时间：2019/12/05

LiDAR diseased trees automatic recognition vertical structure line point cloud normalization

Structural amelioration of 920 nm optically pumped semiconductor vertical external-cavity surface emitting laser (OPS-VECSEL) (EI CONFERENCE) 会议论文
2nd International Conference on Energy, Environment and Sustainable Development, EESD 2012, October 12, 2012 - October 14, 2012, Jilin, China
Liang X.; Wang L.; Ning Y.; Liu Y.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

920 nm optically pumped semiconductor vertical external-cavity surface emitting laser (OPS-VECSEL) has an important application in laser display. We constructed and optimized a 920 nm OPS-VECSEL with active region of In0.09Ga0.91As quantum well (QW) system pumped by 808 nm laser diode module. By the finite element method self-consistent solutions of the semiconductor electronic and optical equations are realized to calculate the characteristics parameters of OPS-VECSEL. The performances of device especially the mode the threshold and the optical-optical translation efficiency were analyzed by dealing with different number of QWs (1 2 and 3) in one period QW depth barrier width the component and dimension of the non-absorption layer. We chose an improved structure of them. On this basis we ameliorated the number of QW periods and the simulation showed that in order to obtain high performance device the choice of the number of QW periods must be cautious. (2013) Trans Tech Publications Switzerland.

Studies of Anti-disaster Ability of the Plate Truss Structure 会议论文
CIVIL ENGINEERING, ARCHITECTURE AND SUSTAINABLE INFRASTRUCTURE II, PTS 1 AND 2, 2013-01-01
作者: Feng, Jiaowei[1]; Lu, Junyan[2]; Ma, Jindong[3]

收藏 | 浏览/下载：2/0 | 提交时间：2019/12/23

plate truss structure vertical load incremental step anti-disaster ability

Image quality assessment based on gradient complex matrix (EI CONFERENCE) 会议论文
2012 International Conference on Systems and Informatics, ICSAI 2012, May 19, 2012 - May 20, 2012, Yantai, China
Wang Y.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

An image quality assessment model based on gradient complex matrix is proposed. The vertical and horizontal gradient information of grayscale image is calculated. Complex number is used to construct the measuring matrix. Singular value decomposition is performed in order to obtain the main structure information of the image. The singular value feature vectors of the image gradient complex matrices corresponding to the reference image and the distorted image are used to measure the structural similarity of the two images. PSNR is taken as a tool to evaluate the gradient distribution similarity. Their properties are analyzed by using LIVE database and nonlinearity regression function. 2012 IEEE.

New electromagnetic imaging tool introduced for corrosion detection 会议论文
2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, Shenyang, Liaoning, China, MAY 25-27, 2012
作者: Zhong XF(钟兴福); Wu YX(吴应湘); Chen JQ; Abakumov A; Zhong XF(钟兴福)

收藏 | 浏览/下载：19/0 | 提交时间：2013/02/26

Electrical engineering Electromagnetism Inspection Insulating materials Magnetic leakage Oil fields Brush structure Casing damage Casing wall Corrosion detection Corrosion inspection Electromagnetic imaging High resolution Magnetic flux leakage Metal loss System structures Thickness determination Vertical profile

Study on numerical analysis of tunnel longitudinal uneven settlement base on elastoplastic theory 会议论文
Hangzhou, China, March 9, 2012 - March 11, 2012
作者: Wu, Shouhe; Li, Zhong; Chen, Siyang

收藏 | 浏览/下载：9/0 | 提交时间：2020/11/15

Building materials Civil engineering Deformation Elastoplasticity Geologic models Numerical analysis Three dimensional 3D numerical model Calculation models Deformation behavior Deformation calculation Elasto-plastic Elasto-plastic theory Element type Formation condition Linear spring Lining structure Longitudinal designs Mohr-Coulomb Shell element Soil materials Three-dimensional solids Tunnel structures Vertical force

Research on infrared dim-point target detection and tracking under sea-sky-line complex background (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
Dong Y.-X.; Li Y.; Zhang H.-B.

收藏 | 浏览/下载：98/0 | 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).

Investigating Vertical Load Distribution and Shoring Systems of Reinforced Concrete Buildings during Construction 会议论文
International Conference on Structures and Building Materials, JAN 07-09, 2011
作者: Cong, Shuping; Han, Jinsheng; Liang, Shuting

收藏 | 浏览/下载：2/0 | 提交时间：2019/12/31

Reinforced Concrete Buildings Construction Vertical Load Distribution Primary Structure Shoring Systems

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