中国科学院机构知识库网格系统: 检索

Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp 会议论文 OAI收割
Llanwddyn, WALES, 2017
作者: Tong FL(童福林); Li XL(李新亮); Duan, Yanhui; Yu ZP(于长平); Yu, CP (reprint author), Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China.

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Concave Surface Curvature Adverse Pressure-gradient Large-eddy Simulation Reynolds-number Near-wall Flows Separation Vortices Models

Experimental study of jet impingement heat transfer on a variable-curvature concave surface in a wing leading edge 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2015, 卷号: 90, 页码: 92-101
作者: Bu, Xueqin; Peng, Long; Lin, Gulping; Bai, Lizhan; Wen, Dongsheng

收藏 | 浏览/下载：31/0 | 提交时间：2016/03/09

Jet impingement Concave surface Convective heat transfer Wing anti-icing

Optical system of large relative aperture and wide field using aspheric corrector for detecting (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Zhang J.; Zhang J.; Zhang J.; Wang J.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The magnitude requirement of space target detecting determines that the image of detecting telescope should have several performances: small spots the wider field of view small 80% encircled energy diameter and good MTF(Modulation transfer function). So the aperture and field of view of optical system have some demands accordingly. The larger aperture the more extensive range which the telescope searches. Now most of ground telescopes whose apertures are from 500mm to 1000mm is on-axis optical system the more energy that telescope collects and higher magnitude the telescope detects so wide field of view becomes the most importance problem. To obtain large relative aperture and wide field of view the paper introduces a catadioptric telescope with small aperture aspheric refractive corrector whose conic surface will be used to remove the aberrations due to large relative aperture and wide field of view. As to the optical system there is only one aspheric refractive corrector and it is relatively easy for manufacturing because of its concave figure and normal material. The paper gives the example and optimizes this optical system with ZEMAX program. And then the paper provides a specific analysis program for testing the aspheric refractive corrector. The aperture of this optical system is 750mm and its relative aperture is 0.82 and the field of view is 3.6 diameter(diagonal). Its structure is simple and the image quality is also very good. 2009 SPIE.

Design and tolerance analysis of compensator for high order aspheric surface testing (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Optical Instruments and Technology - Optoelectronic Measurement Technology and Systems, October 19, 2009 - October 22, 2009, Shanghai, China
作者: Chen X.; Liu W.; Chen X.; Chen X.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

High accuracy is required in surface testing of 90nm nodal point lithography projecting lens. By comparing various aspheric surface testing methods the structure layout of the compensator is a meniscus positive lens combined with a Plano-convex positive lens. The design results indicate that: primary and high order aberrations are balanced well we adopt Offner null compensator to test the aspheric surface in the point diffraction interferometer at last. In this paper MTF exceeds diffraction limit an Offner compensator is presented on the base of the third order aberration theory to test concave aspheric surface root-mean-square (RMS) of wave front error /167. The F-number of the system can achieve F/1.64. By the analysis of the process of aspheric surface testing with the designed system the optical construction parameters of which is determined by introducing equal-quantities spherical aberration to compensate all orders of aspheric coefficients. The field of view of the system is 0.02 a loosen distribution of the tolerance was presented based on the accuracy of measuring apparatus. 2009 SPIE.

Mechanism of formation of physical soil crust in desert soils treated with straw checkerboards 期刊论文 iSwitch采集
Soil & tillage research, 2007, 卷号: 93, 期号: 1, 页码: 222-230
作者: Fang, Hai Y.

收藏 | 浏览/下载：42/0 | 提交时间：2019/05/10

Straw checkerboard Stable concave curved surface Physical soil crust Sorting action Dustfall Precipitation

Key techniques of laser direct writing patterns on spherical substrate (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhao J.-L.; Feng X.-G.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Comparing with the writing method of plane pattern spherical pattern' has some remarkable different on several points. Firstly it is difficult to spin-coated a uniform photoresist film on a spherical substrate especially the ratio of spherical radius to caliber is smaller and the spin-coated way must match the ratio of spherical radius to caliber. Secondly if the sphere couldn't be regarded as a plane a so-called concentric optical scan movement way must be applied for the generation of spherical pattern because the reflex of substrate will affect the quantity of illumination. Commonly an alignment technique is indispensable with pattern generation of spherical surface by the concentric optical scan in order to ensure the orthogonal intersection of focusing laser beam and writing surface. Thirdly a uniform velocity control must be considered for the laser direct writing method on a spherical substrate. Otherwise the exposure time of photoresist will be different and the line widths of pattern will be also different at different areas. Fourthly commonly because the errors of concentric machine and substrate surface shape are bigger so focusing servo-control technique is also needful for writing a pattern on a spherical substrate. Focusing servo-control may keep the focal spot on the spherical surface by a focus detection and control system in the course of writing pattern. Using these techniques we fabricated a line width of 7m and a period of 600m isometric mesh on the concave of a spherical substrate.

Mechanism of formation of physical soil crust in desert soils treated with straw checkerboards SCI/SSCI论文 OAI收割
2007
Fang H. Y.; Cai Q. G.; Chen H.; Li Q. Y.

收藏 | 浏览/下载：32/0 | 提交时间：2012/06/08

straw checkerboard stable concave curved surface physical soil crust sorting action dustfall precipitation wind erosion water salinity sandy soils china infiltration disturbance morphology vegetation sediment texture

Fabrication of vertical coupled polymer microring resonator (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Communication, August 21, 2005 - August 26, 2005, Changshun, China
作者: Zhang D.; Zhang D.; Wang P.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

In this paper a new fabricating strategy for polymer microring resonators vertically coupled to a bus waveguide is developed. A carefully engineered Al masking process is utilized to compensate the local concave of the buried waveguide formed by polymer spin-coating realizing perfectly flat top surface of the buried bus waveguide. A serial of the vertically coupled polymer microring resonator showing excellent topology was fabricated with this strategy. The resonance phenomenon is oberved in a PMMA-based microring resonators using this fabricating strategy. The suggested approach is suitable to fabricate vertically coupled polymer micro-resonators.

Method for the fabrication of isometric mesh on the concave of a spherical substrate (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies - Advanced Optical Manufacturing and Testing Technologies, November 2, 2005 - November 5, 2005, Xian, China
作者: Feng X.-G.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Metallic mesh has been widely used in electromagnetic interference windows. While the duty ratio of curved mesh equals to planar mesh' the theory of planar mesh may be applied to curved mesh according to equivalent-circuit model. So the idea that latitude lines intersect latitude lines to form isometric mesh on the concave of a sphere is put forward and the method of fabricating the mesh by concentric optical scan is introduced. The movement parts of equipment consist of an erection turning a horizontal dividing and a pitching dividing spindle. Firstly a spherical substrate is fixed on the horizontal dividing spindle that has been set horizontally on the erect turning spindle the substrate revolves around the axis of the erect spindle the tube of object lens that is fixed on the pitching dividing spindle steps at pitching direction and a revolving circuit of the substrate corresponds to a step of the tube. Gradually a set of latitude lines is attained. Afterward the substrate makes a quarter turn around the horizontal spindle another orientation latitude lines are also gained. Thus the isometric mesh on the concave of a spherical substrate is gained. The process comprises surface cleaning coating photoresist laser direct writing development evaporated film dissolving photoresist and plating. The fabricated spherical mesh has a line width of 7 m and a period of 600m. Experiment shows that infrared transmission and electromagnetism shield efficiency of the metallic mesh are relatively consistent with theoretical value.

Structure-function relationship of three neurotoxins from the venom of Naja kaouthia: a comparison between the NMR-derived structure of NT2 with its homologues, NT1 and NT3 期刊论文 OAI收割
BIOCHIMICA ET BIOPHYSICA ACTA, 2002, 卷号: 1594, 期号: 2, 页码: 353-363
作者: Cheng Y; Meng QX; Wang WY; Wang JF*; jfw@sun5.ibp.ac.cn

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收藏 | 浏览/下载：14/0 | 提交时间：2010/08/24

Short-chain Neurotoxin Homology Model Building Potential Surface Concave Face