中国科学院机构知识库网格系统: 检索

Calculation method for theoretical dispersion curves of seismic channel waves considering variation of coal-seam thickness and analysis of dispersion characteristics 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2018, 卷号: 61, 期号: 8, 页码: 3374-3384
作者: Qiao YongHu; Teng JiWen

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收藏 | 浏览/下载：31/0 | 提交时间：2018/12/11

Seismic channel wave Coal-seam thickness variation Ray path Theoretical dispersion curve Dispersion characteristics

Investigate on mechanical and tribological properties of solution styrene butadiene and butadiene rubber composites 期刊论文 OAI收割
POLYMERS FOR ADVANCED TECHNOLOGIES, 2018, 卷号: 29, 期号: 10, 页码: 2674-2682
作者: Wu, Yanping; Dong, Jia; Yuan, Rui; Wan, Hongqi; Chen, Lei

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收藏 | 浏览/下载：49/0 | 提交时间：2018/12/04

Modified Silica Surface Modification Wear Characteristics Graphene Sheets Nitrile Rubber Carbon-black Friction Dispersion Behavior Blends

Investigate on mechanical and tribological properties of solution styrene butadiene and butadiene rubber composites 期刊论文 OAI收割
POLYMERS FOR ADVANCED TECHNOLOGIES, 2018, 卷号: 29, 期号: 10, 页码: 2674-2682
作者: Wu, Yanping; Dong, Jia; Yuan, Rui; Wan, Hongqi; Chen, Lei

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收藏 | 浏览/下载：43/0 | 提交时间：2018/12/04

Modified Silica Surface Modification Wear Characteristics Graphene Sheets Nitrile Rubber Carbon-black Friction Dispersion Behavior Blends

Terahertz planar waveguide devices based on graphene 期刊论文 OAI收割
MODERN PHYSICS LETTERS B, 2017, 卷号: 31, 期号: 5, 页码: 1-6
作者: Yuan, Yizhe; Guo, Xiaoyong; An, Liqun; Xu, Wen

收藏 | 浏览/下载：17/0 | 提交时间：2018/05/17

Thz Waveguide Graphene Linear Dispersion Planar Structure Transmission Characteristics

A Two-Stage Method to Estimate the Contribution of Road Traffic to PM2.5 Concentrations in Beijing, China SCI/SSCI论文 OAI收割
2016
作者: Fang X.; Li, R. K.; Xu, Q.; Bottai, M.; Fang, F.

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收藏 | 浏览/下载：29/0 | 提交时间：2017/11/09

PM2.5 concentration road traffic contribution atmospheric dispersion model generalized additive mixed model long-term exposure use regression-models source apportionment air-pollution particulate matter united-states human health chemical characteristics emission factors receptor models

A Two-Stage Method to Estimate the Contribution of Road Traffic to PM2.5 Concentrations in Beijing, China SCI/SSCI论文 OAI收割
2016
作者: Fang X.; Li, R. K.; Xu, Q.; Bottai, M.; Fang, F.

收藏 | 浏览/下载：38/0 | 提交时间：2016/12/16

PM2.5 concentration road traffic contribution atmospheric dispersion model generalized additive mixed model long-term exposure use regression-models source apportionment air-pollution particulate matter united-states human health chemical characteristics emission factors receptor models

Pedogenesis significantly decreases the stability of water-dispersible soil colloids in a humid tropical region SCI/SSCI论文 OAI收割
2016
作者: Huang L. M.; Zhang, X. H.; Shao, M. A.; Rossiter, D.; Zhang, G. L.

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收藏 | 浏览/下载：28/0 | 提交时间：2017/11/09

Soil development Chronosequence Mineral in clay Colloid stability Point of zero charge Delta pH different parent materials arid-zone soils aggregate stability clay dispersion hainan island charge characteristics facilitated transport southeastern nigeria biogenic silica organic-matter

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).

Design of dual-FOV refractive/diffractive LWIR optical system (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Wang L.-J.; Zhang J.-P.; Wang L.-J.; Zhang X.; Zhang X.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

An infrared-optical zoom system using binary element is proposed in this paper. The two main advantages of the zoom system introducing here are: bigger F-number and lower cost. The primary optical properties are: F/#=1 Second Others zoom ratio =1:4 binary element is used to correct the chromatical aberration by taking the advantage of negative dispersion characteristics and the cost of the system is lower than that of conventional ones with Zinc Selenide (Znse) material at the same level. In the binary element is rotational symmetric with one step which is easy to fabricate in order to balance 5th spherical aberration and dual field are 26.6 and 5.6respectively. Wider field of view is used for search and the smaller one is used for imaging details. This system uses un-cooled infrared detector with 320240 pixels and 45m pixel size. The F-number matches the sensitivity range of the detector array. Three aspects are considered during design process to make the system more satisfactory and more achievable. First 5th coma aberration and 5th astigmatic aberration the manner of zoom is accomplished by exchanging tow lenses into the smaller field of view system layout. The lens exchange manner faces the requirement of simple system structure and good image quality in both focal points. It can also make the system more feasible in the alignment process than mechanical-zooming manner and optical-zooming manner high-order asphere surfaces with 2th order to 10 th order are also hired in the system. Asphere surface is useful in compressing the system and improving optical system transmittance. This kind asphere surface is on industrial level featuring low cost and easy to fabricate. It is shown that good image quality can achieved by implementing five Germanium lenses and the transmittance of system is 72%. All aberrations are diffraction-limited both spherical aberration and astigmatic aberration are corrected. When the field of view(FOV) is 26.6 and the focal length is 152mm MTF at Nyquist frequency(11lp/mm) is great than 0.7. The spherical aberration is -0.0073. The coma aberration is 0.0978 and the astigmatic aberration is -0.013. When the field of view(FOV) is 5.6 and the focal length is 38mm MTF at Nyquist frequency is great than 0.8 with spherical aberration -0.0046 the coma aberration 0.055 and astigmatic aberration 0.034.

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.