中国科学院机构知识库网格系统: 检索

Experimental and modeling investigation of the thermal conductivity of fiber-reinforced soil subjected to freeze-thaw cycles 期刊论文 iSwitch采集
APPLIED THERMAL ENGINEERING, 2016, 卷号: 108, 页码: 824-832
作者: Orakoglu, Muge Elif; Liu, Jiankun; Niu, Fujun

收藏 | 浏览/下载：26/0 | 提交时间：2019/10/09

Thermal conductivity Freeze-thaw Fiber-reinforced soil The statistical-physical model

Experimental study on coherent beam combination of fiber amplifiers using adaptive power-in-the-bucket cost function 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2013, 卷号: 62, 期号: 22
作者: Geng Chao; Luo Wen; Tan Yi; Liu Hong-Mei; Mu Jin-Bo

收藏 | 浏览/下载：34/0 | 提交时间：2015/04/17

fiber laser array tip/tilt control adaptive power-in-the-bucket coherent beam combining

Experimental research of tip/tilt control of a multi-channel fiber-laser array 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2013, 卷号: 62, 期号: 2
作者: Geng Chao; Tan Yi; Mu Jin-Bo; Li Xin-Yang

收藏 | 浏览/下载：22/0 | 提交时间：2015/04/17

fiber-laser array tip/tilt control conformal transmission target-in-the-loop

Experimental investigation on coherent beam combination of a three-element fiber array based on target-in-the-loop technique 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2012, 卷号: 61, 期号: 3
作者: Geng Chao; Li Xin-Yang; Zhang Xiao-Jun; Rao Chang-Hui

收藏 | 浏览/下载：30/0 | 提交时间：2015/07/10

fiber array coherent beam combination target-in-the-loop adaptive fiber optics collimator

Design of semi-physical simulation for small satellite by virtual display (EI CONFERENCE) 会议论文 OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
Xu K.; Lv Y.; Jin G.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment the simulation computer high-precision single-axis air-bearing turntable reaction wheel air thrust device fiber gyroscopes sensors synchronizer power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient. (2012) Trans Tech Publications Switzerland.

Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文 OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：62/0 | 提交时间：2013/03/25

The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope the structure should have high stiffness and high reliability and light weight. Compared with invar aluminum alloy and titanium alloy carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages such as ultra-light weight high stiffness and dimensional stability etc. The optimization method and the baffle design can be helpful to other coaxial telescopes such as Cassegrain Gregorian and their subdivisions. 2012 IEEE.

Short-length large-mode-area photonic crystal fiber laser operating at 978 nm 会议论文 OAI收割
the second international symposium on laser interaction with matter (limis 2012), xi’an, china, 2012
Jing He; Ziwei Wang; Wendi Wu; Songtao Du

收藏 | 浏览/下载：12/0 | 提交时间：2013/09/13

fiber laser the three-level system rod-type PCF

The design and research for the shaping of the LDA (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
作者: Wang L.; Wang L.; Wang L.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

We analyze the structure defects of the LDA and compare the coupling mode of the LDA and a fibers array to the coupling mode of the LDA and a single fiber. We also design several new coupling methods of laser and fibers and discuss the advantages and the disadvantages of them. 2011 IEEE.

Research on lightweight outer baffle for coaxial space camera (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Stray light is non-imaging light that reach the optical system imaging plane. The non-imaging light can be received by detector if it is not effectively controlled and stray light which directly irradiates on the detector has great influence on the imaging quality. Stray light can be effectively inhibited if the outer baffle of space camera is designed optimally. Carbon fiber composite material is chosen as main material to meet requirements of a coaxial space optical system. The outer baffle should have advantages such as lightweight high stiffness and dimensional stability etc. Using optimization design tools the lightweight outer baffle is designed. And finite element method is used to check the structure. Development and test results show that the outer baffle with a diameter of 620mm and a total length of 1200mm only weighs 7.3kg. And the baffle's natural frequency reaches 88Hz and it can satisfy the requirements of the space camera. 2011 IEEE.

Laser beacon adaptive optics ophthalmoscope for retinal multilayer imaging (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Bioelectronics and Bioinformatics, ISBB 2011, November 3, 2011 - November 5, 2011, Suzhou, China
作者: Xuan L.; Zheng X.; Li D.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

A flood-illuminated adaptive optics ophthalmoscope for retinal multilayer imaging is introduced in this paper. By arranging an alterable stop in the illumination path the illuminated area of retinal layer can be changed. A laser beacon for wavefront sensing is formed when the stop is a narrow aperture. The large aperture allows flood illumination and expands imaging field. A moveable imaging camera can focus on different layers of the retina. In the confirming experiment a subject who was a 25-years-old normal health Chinese male was imaged. We got clear images of photoreceptor layer blood vessels and nerve fiber layer. 2011 IEEE.