中国科学院机构知识库网格系统: 检索

废弃印刷线路板机械分离产物中典型贵金属分布特征研究 学位论文 OAI收割
硕士, 北京: 中国科学院研究生院, 2013
叶一

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电子废弃物多层板单面板机械分离贵金属分布 e-waste single-sided boards multi-layer boards mechanical separation precious metals distributing

Study on spectrograph for ionosphere: A broadband imaging instrument prototype for far-ultraviolet (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
作者: Wang S.-R.; Lin G.-Y.; Yu L.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

Current research on space-based exploration for the ionosphere needs more advanced technologies. Because the spectral signals in the ionosphere distributing basically in the far-ultraviolet waveband are very weak. Usual spectrometer structures and detectors such as CCD can't receive enough information. Based on this principle of atmospheric sounding the imaging spectrometer prototype for ionosphere detection application was designed to solve the problem. This prototype consists of the telescope and the imaging spectrometer. The simple structure and small number of mirrors can help higher transmission efficiency be achieved and weak signals detection be implemented. The telescope is an off-axis parabolic mirror and the spectrometer is a modified Czerny-Turner spectral imaging system. Modified Czerny-Turner spectrometer contains a spherical mirror a fixed plane grating and a toroidal mirror. By adjusting the incident angle to the collimating mirror and using toroidal mirror coma and astigmatism were corrected well. We also optimize distances between the grating to the focusing mirror and the focusing mirror to the image plane to improve disadvantages of traditional Czerny-Turner structure. Designed results demonstrate that aberrations are substantially corrected and high image quality can be obtained in broad waveband. The photon counting Wedge-Strip-Anode detector with micro-channel planes as the receiving plane is accepted for the instrument prototype. The other photon counting 2-D detector responding well for weak light such as Cross-Delay line detector and MAMA detector can also be used for detection. The calibration and performances testing system is made of a vacuum system a deuterium lamp a monochrometer and the instrument prototype. Results obtained from the experiment show that the spectral resolution is 2.4 nm and the spatial resolution is 80 m. The other calibration experiments are running. The technology of the spectrometer prototype is important for the research and applications of ionosphere remote sensing. 2011 SPIE.

Nitrogen removal enhanced by shunt distributing wastewater in a subsurface wastewater infiltration system 期刊论文 OAI收割
ECOLOGICAL ENGINEERING, 2010, 卷号: 36, 期号: 10, 页码: 1433-1438
作者: Wang, Xin; Sun, Tieheng; Li, Haibo; Li, Yinghua; Pan, Jing

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Land Treatment Systems Subsurface Wastewater Infiltration System Pollutant Removal Shunt Distributing Wastewater Nitrification And deNitrification

Nitrogen removal enhanced by shunt distributing wastewater in a subsurface wastewater infiltration system 期刊论文 iSwitch采集
Ecological engineering, 2010, 卷号: 36, 期号: 10, 页码: 1433-1438
作者: Wang, Xin; Sun, Tieheng; Li, Haibo; Li, Yinghua; Pan, Jing

收藏 | 浏览/下载：39/0 | 提交时间：2019/05/10

Land treatment systems Subsurface wastewater infiltration system Pollutant removal Shunt distributing wastewater Nitrification and denitrification

A method of outdoor simulation of infrared radiance of targets (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, June 17, 2009 - June 19, 2009, Beijing, China
Song J.-T.; Shen X.-H.; Zhao Y.-J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

Current research on infrared simulation often focuses mainly on infrared imaging simulation by computer and pays little attention to outdoor simulation of infrared radiation characteristics of targets. In order to simulate infrared radiance of targets outdoors in this paper we propose a new outdoor simulation method on the basis of heating the cloth by electricity. There are two major contributions in the paper. Firstly uneven distributing of temperature field of the cloth surface is considered and the long-wave thermal imager is used as a link of the temperature control system. On the basis of many experiments the expression is concluded about the relation of the temperature obtained by the lone-wave thermal imager and the temperature obtained by the temperature control system and the environmental temperature at the experimental scene. Secondly the influence of the environment at the experimental scene on the infrared radiance of the cloth surface is thought over. Thanks to two measures above simulation precision of infrared radiance is made much better. The results of many outdoor experiments demonstrate the performance of the proposed approach. 2009 SPIE.

The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology (EI CONFERENCE) 会议论文 OAI收割
Optical System Alignment and Tolerancing II, August 10, 2008 - August 11, 2008, San Diego, CA, United states
作者: Yan F.; Zhang X.-J.; Yan F.

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The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus astigmatism and Petzval curvature temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.

An edge extracting method of fuzzy thresholding value (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
Gu R.; Zhu M.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

This paper discusses image's object edge extracting of threshold value. First this paper introduces fundamental principle of gray image object edge extracting after discussing the influence of object edge image's gray scale distributing characteristic and choice of threshold value to character extracting and target identification we bring forward a sort of method which using object edge fuzzy taxonomy and maximum fuzzy entropy theory to auto choose threshold value in the case that membership function is given then we have a test of threshold value segmentation to edge gray image in different contrast the result indicates this method has preferable scene adaptive faculty.

Study of removing striping noise in CCD image (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Striping noise is the common system noise during formation of image using linear array CCD and has the character of periodicity directivity and banding distributing. It can be caused by errors in internal calibration devices or by slight gain/offset differences among the elements that conform the array of detectors. Striping noise covers up useful information in CCD image and brings adverse effect to image interpretation. On the basis of analyzing wavelet decomposed coefficient the regularities of distribution about striping noise in wavelet coefficient is found thereby the method of wavelet threshold selection which is suitable to striping noise distribution is put forward. According to Donoho's method about denoising using wavelet the image including striping noise is processed. Comparing the power spectrum of processed image with the one of original image polluted by striping noise in frequency field we find pulse brought by striping noise is removed and the goal which reserves image details and reduces stripes is achieved.

几种高温自润滑复合材料的研制与性能研究 期刊论文 OAI收割
摩擦学学报, 1995, 卷号: 15, 期号: 4, 页码: 324-332
牛淑琴; 朱家佩; 欧阳锦林

收藏 | 浏览/下载：24/0 | 提交时间：2015/07/09

超级镍合金自润滑复合材料配气阀座平衡活塞发动机 super nickel alloy self-lubricating composite distributing valve seat equalizing piston engine

镍合金基自润滑复合材料的研究 期刊论文 OAI收割
摩擦学学报, 1993, 卷号: 13, 期号: 1, 页码: 33-47
欧阳锦林; 牛淑琴; 阮虎生; 朱家佩

收藏 | 浏览/下载：47/0 | 提交时间：2014/11/19

镍合金基复合材料高温自润滑配气阀座物理-机械性能摩擦磨损性能 nickel alloy base composite high-temperature self-lubricating distributing valve seat physiomechanical performance friction-wear property