中国科学院机构知识库网格系统: 检索

The Characteristics at the Ali Observatory Based on Radiosonde Observations 期刊论文 OAI收割
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2018, 卷号: 130, 期号: 994, 页码: 14
作者: Qian, Xuan; Yao, Yongqiang; Wang, Hongshuai; Wang, Yiping; Bai, Zhen

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收藏 | 浏览/下载：24/0 | 提交时间：2020/03/10

site testing methods: data analysis atmospheric effects balloons Online material: color figures

Synthetic Rock Analogue for Permeability Studies of Rock Salt with Mudstone 期刊论文 OAI收割
APPLIED SCIENCES-BASEL, 2017, 卷号: 7, 期号: 9, 页码: -
作者:

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收藏 | 浏览/下载：48/0 | 提交时间：2018/06/05

gas storage material science rock permeability synthetic rock salt testing Klinkenberg method

Analysis of resistance cracking process on the experiment of meso and macroscopic of quasi-brittle materials 会议论文 OAI收割
Beijing, China, June 16, 2013 - June 21, 2013
作者: Wang LM; Xu SL; Wang HY(汪海英); Zhang DH

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收藏 | 浏览/下载：25/0 | 提交时间：2018/11/08

Brittleness Cast iron Concretes Cracks Deformation Energy dissipation Fracture testing Inverse problems Materials testing Oscillators (electronic) Stress concentration Cohesive cracks Constitutive relations Engineering materials Fracture process Fracture process zone Mesoscopics Quasibrittle material Theoretical calculations

A new algorithm for solving the best-fit sphere of optical aspherical surface (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Advances in Materials and Manufacturing, ICAMMP 2011, December 16, 2011 - December 18, 2011, Guilin, China
作者: Lin J.; Lu M.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

To solve the best-fit sphere (BFS) accurately is one of the technological keys for the generating and testing of optical aspherical surfaces. This paper presents a new algorithm for solving the BFS of aspherical surfaces to suppress some deficiencies in the existing BFS algorithms. In the proposed approach it is not only suitable for the conic surface a BFS is constructed but also for higher order aspheres. The obtained asphericity and material removal function is more suitable for the machining and test. (2012) Trans Tech Publications which passes through both sides of endpoints in the section o -?xy of the aspherical surfaces Switzerland. the center of the BFS is shifted along the x-axis and its radius of curvature is automatically computed. The variable step size method is proposed to speed up the convergence of the iteration. Through numerically solving the BFS of conic and cubic surface the advantages of the proposed approach are verified. The results show that the proposed approach is of rapid convergence and high accuracy

RESEARCH AND ANALYSIS ON STABILITY OF BOLT REINFORCED TUNNEL IN ANISOTROPIC LAYERED ROCK MASS WITH LOW INCLINATION ANGLE STRATIFICATION 会议论文 OAI收割
Huazhong Univ Sci & Technol, NOV 17-19, 2012
作者: Li, Dan; Bai, Shiwei; Chen, Hao; Xia, Binwei

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收藏 | 浏览/下载：22/0 | 提交时间：2018/06/05

Physical model test large scale real triaxial physical model testing machine bias pressure elasto-brittle simulated material layered rock mass overload coefficient

Experimental study of the compressive performance of life jacket use polyurethane foam for blast wave protection 会议论文 OAI收割
2012 2nd International Conference on Advanced Material Research, ICAMR 2012, Chengdu, China, JAN 07-08, 2012
作者: Li MH; Bai CH; Shi MW; Wei YP(魏延鹏); Zhou H

收藏 | 浏览/下载：33/0 | 提交时间：2013/02/26

Ocean engineering Strain rate Yield stress Absorption performance Blast waves Closed cells Compressive performance Dynamic mechanical behavior Experimental studies Life jackets Low mass Material testing Polyurethane Foam Protection layers Protection measures Quasi-static Split Hopkinson pressure bars Underwater blast injury

Manufacture of 1.2m reaction bonded silicon carbide mirror blank CFID (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: Zhang G.; Zhang G.; Zhang G.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion high stiffness fine optical quality and dimensional stability make SiC an ideal material for large space born telescope. Since ten years Changchun institute optics fine mechanics and physics (CIOMP) has developed reaction bonded SiC (RB-SiC) technology for space application and can fabricate RB-SiC mirror with scale less than 1.0 meter for telescope. The green body is prepared with gel-casting method which is an attractive new ceramic forming process for making high-quality complex-shaped ceramic parts. And then unmolding drying binder burning out reacting bonded the RB-SiC can be obtained. But with the development of space-born or ground telescope the scale of primary mirror has exceeded 1.0 meter. So CIOMP has developed an assembly technique which called novel reaction-formed joint technology for larger RB-SiC mirror blank. The steps include joining of green bodies with mixture comprised of SiC particles and phenolic resin etc firing machining and sintering. Joining the 1.2 meter RB-SiC mirror blank by the novel reaction-formed joint technology. And testing the welding layer's performance the results show that the thickness of 54-77m the microstructure and thermal property can be comparable to the substrate and the mechanical property are excellent in bending strength of 307MPa. 2010 Copyright SPIE - The International Society for Optical Engineering.

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：22/0 | 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.

IAD-Si coatings on RB-SiC space mirrors for ultra-smooth surfaces (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: Xu L.; Wang X.; Wang X.; Wang X.; Zhang F.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

To eliminate surface limitation caused by Silicon impurity in RB-SiC space mirrors a relatively thick Si film is deposited on well finished RB-SiC substrate by a new process-ion assisted depositing (IAD) to provide a better polishable surface. Testing results of IAD-Si properties are provided showing that the amorphous film has great thermal shock resistance. Then polishing experiments on 100.5m thick IAD-Si layers are accomplished focusing on smoother surface. Surface figure and micro-roughness of the coating after polished reach 0.026 RMS (=0.6328nm) and less than 0.5nm RMS respectively. Moreover reflectivity of IAD-Si polished surface with reflective films increases higher than 4.5% than that of RB-SiC in 360-1100nm. High reflectivity and desirable thermal property make IAD-Si an attractive coating material for RB-SiC space mirrors. 2009 SPIE.

Wear behavior of thermally sprayed coatings under different loading conditions 期刊论文 OAI收割
Tribology Transactions, 2005, 卷号: 48, 期号: 1, 页码: 45-50
D. L. Duan; S. Li; X. H. Duan; S. Z. Li

收藏 | 浏览/下载：19/0 | 提交时间：2012/04/14

wear-resistant coating wear mechanisms testing material properties