中国科学院机构知识库网格系统: 检索

Empirical Expression of Phase Function for Non-Spherical Particles 期刊论文 OAI收割
SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 卷号: 39, 期号: 1, 页码: 1-7
作者: Cheng Chen; Xu Qing-shan; Zhu Lin

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收藏 | 浏览/下载：30/0 | 提交时间：2020/03/31

Non-spherical particle Phase function Empirical expression Backward scattering

Non-Negative Spherical Deconvolution (NNSD) for estimation of fiber Orientation Distribution Function in single-/multi-shell diffusion MRI 期刊论文 OAI收割
NEUROIMAGE, 2014, 卷号: 101, 页码: 750-764
作者: Cheng, Jian; Deriche, Rachid; Jiang, Tianzi; Shen, Dinggang; Yap, Pew-Thian

收藏 | 浏览/下载：116/0 | 提交时间：2015/08/12

Spherical deconvolution Diffusion MRI Fiber Orientation Distribution Function Non-negativity constraint Spherical harmonics

Photodetachment near a repulsive center: Closed-orbit theory for the total cross section 期刊论文 OAI收割
PHYSICAL REVIEW A, 2014, 卷号: 89, 期号: 1, 页码: 13417
作者: Du, ML

收藏 | 浏览/下载：36/0 | 提交时间：2014/04/25

STATIC ELECTRIC-FIELD COULOMB GREENS FUNCTION NEGATIVE-ION PHOTODETACHMENT SPHERICAL TENSOR GRADIENT MAGNETIC-FIELD CLASSICAL ORBITS QUANTUM SPECTRA WAVE PHOTODETACHMENT H-PHOTODETACHMENT CHARGED ANIONS

估计和处理扩散磁共振成像中的总体平均扩散概率密度及其特征 学位论文 OAI收割
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2012
作者: 程健

收藏 | 浏览/下载：211/0 | 提交时间：2015/09/02

扩散磁共振成像高角分辨率扩散成像球极傅立叶成像总体平均扩散密度函数方向分布函数黎曼框架标准正交基测地各向异性插值平方根参数化估计 diffusion MRI High Angular Resolution Di ﬀ usion Imaging Spherical Polar Fourier Imaging Ensemble Average Propagator Orientation Distribution Function Riemannian Framework Orthonormal Basis Geodesic Anisotropy Interpolation

The optical design of cubic phase plate testing system (EI CONFERENCE) 会议论文 OAI收割
2011 Symposium on Photonics and Optoelectronics, SOPO 2011, May 16, 2011 - May 18, 2011, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.; Zhang Y.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

Computer-generated holograms (CGH) have been widely used for years in optical testing of aspheric surfaces in combination with Fizeau interferometers. With the development of diffraction optics computer technology and micro-processing technology the accuracy of the CGH testing can achieve a hundredth of a wave and the cost is reduced greatly. CGH is capable of producing an optical wavefront with any desired shape. So it is fascinating and will have good prospects to test free-form surfaces using CGH. As the CGH can create any wavefront shape it can also be used in unsymmetrical aspherical surfaces testing. Taking the cubic surface as an example this paper gives a method to test unsymmetrical surfaces. This paper gives the design to test a cubic surface. And the separation of the diffraction orders and the binary process of the continuous CGH phase function are discussed in detail. The alignment tolerance of the test system and the CGH fabrication tolerance are analyzed. We also present an idea using a CGH and two spherical lenses as null lens to test the cubic surface when the surface deviation is great. 2011 IEEE.

Thermal-structure analysis of supersonic dome based on three materials (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Jiang Z.; Ai X.; Wei Q.; Liu B.; Jia H.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

To a supersonic missile a seeker could enhance the aerodynamic ability due to decrease the resistance in flying. At the same time the primary function of a seeker has been considered as the most important equipment for a missile due to the importance for cueing of targets and tracking for the final approach. However the dome of a seeker which is made up of glass has poor mechanical performance. Especially in the higher altitude for a dome in which the aerothermal and pressure loads could destroy the structure easily it is necessary to do the thermal-structure coupled analysis due to varied materials. In the paper to take the spherical dome of a seeker as a example the analysis has been completed according to the varied materials consist of MgF2 Al2O3 and ZnS. The temperature loads and the pressure loads derived from the results of fluent analysis has been forced on the surface of dome which simulates the actual Mach 2.5 in flying. According to the results of coupled analysis the SEQV stress of the dome radium 80mm based on three materials had reached to 31MPa which shows that the strength is sufficient for Mach 2.5 and offered the warranty to design the attaching to missile for the dome. At the same time the results required the flexible mounting for the dome due to the displacements results which the crystal material couldn't accept. 2011 IEEE.

Spherical superlens analysed by dyadic Green's function 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2010, 卷号: 59, 期号: 11, 页码: 8178-8183
作者: Shang Ying; Huo Bing-Zhong; Meng Chun-Ning; Yuan Jing-He

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收藏 | 浏览/下载：14/0 | 提交时间：2019/04/09

Spherical Superlens Dyadic Green' s Function Method Sufface Mold High Resolution

Research of active supporting technology based on 400mm thin mirror (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者: Liu X.-Y.; Wang J.-L.; Wang J.-L.; Liu X.-Y.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Using a spherical mirror of 400mm diameter and 12mm thickness active supporting technology of thin mirror is researched. The axial support of the mirror is composed of 12 active supports and 3 fixed supports. The force actuator which is composed of displacement actuator and force sensor is installed in the active support. The mirror surface is tested by Zygo interferometer. For calibration each actuator exerts unit force alone and the surface variation is tested and taken as the response function of the actuator. The response functions of all actuators compose the stiffness matrix. Then the stiffness matrix is used by damped least square method to determine the correction force of each active support. In order to analyze the correction capability of the active supports 14 Zernike modes of the mirror surface are generated and tested respectively and 7 modes are selected for correction. Initially the RMS error of mirror surface is 1.16 I( =0.6328nm)when all actuators exert the same force. After 5 iterations the RMS error of mirror surface is reduced to 0.13 close to the original surface quality. 2010 Copyright SPIE - The International Society for Optical Engineering.

FEA OF EVALUATING MATERIAL YIELD STRENGTH AND STRAIN HARDENING EXPONENT USING A SPHERICAL INDENTATION 期刊论文 OAI收割
ACTA METALLURGICA SINICA, 2009, 卷号: 45, 期号: 2, 页码: 189-194
作者: Cui Hang; Chen Huaining; Chen Jing; Huang Chunling; Wu Changzhong

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收藏 | 浏览/下载：9/0 | 提交时间：2021/02/02

FEA (finite element analysis) spherical indentation yield strength strain hardening exponent dimensionless function

A spherical catadioptric telescope system based on Cooke corrector group (EI CONFERENCE) 会议论文 OAI收割
Novel Optical Systems Design and Optimization XII, August 3, 2009 - August 4, 2009, San Diego, CA, United states
作者: Zhang J.; Liu W.; Zhang J.; Zhang J.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

To obtain a number of advantages in fabrication testing and alignment many designs in which spherical mirrors replace classical Cassegrain-form aspheric mirrors are present in the literature. However spherical mirrors suffer from substantial spherical aberration and thereby require some form of corrector group. But in this case the question encountered is that of making the basic optical configuration more complex. In this paper a new design based on Cooke corrector group is presented for eliminating spherical aberration which is believed to provide higher performance with less complexity than previous approaches. Besides the cost and fabrication period will be extremely decreased. The telescope system using corrector group here can achieve good optical performance with f# of 10 full field of 0.5 obscuration of 1/3 and MTF (Modulation Transfer Function) of 0.48 corresponding to 50@lp/mm. 2009 Copyright SPIE - The International Society for Optical Engineering.