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High temperature effects on irradiation damage of Ti2AlC 会议论文
Liu, Shaoshuai; Wang, Chenxu; Yang, Tengfei; Fang, Yuan; Huang, Qing; Wang, Yugang
收藏  |  浏览/下载：5/0  |  提交时间：2017/12/03
Compact thermal modeling of spin transfer torque magnetic tunnel junction 会议论文
26th European Symposium on Reliability of Electron Devices, Failure Physics and Analysis, Toulouse, FRANCE, 2015-08-01
作者:  Wang, Y.;  Cai, H.;  Naviner, L. A. B.;  Zhang, Y.;  Klein, J. O.
收藏  |  浏览/下载：6/0  |  提交时间：2020/01/06
Well Control Technology of High Temperature and High Pressure with Different Well Shapes 会议论文
International Conference on Energy Engineering and Environmental Engineering (ICEEEE 2013), Hangzhou, PEOPLES R CHINA, 2013-01-01
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收藏  |  浏览/下载：2/0  |  提交时间：2020/01/03
Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
Zhang L.; Jia X.; Xie P.; Xing L.
收藏  |  浏览/下载：47/0  |  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.  
The Laboratory Research on Ultra-low Interfacial Tension Foam Flooding System with High-temperature and High-salinity 会议论文
FRONTIERS OF GREEN BUILDING, MATERIALS AND CIVIL ENGINEERING, PTS 1-8, 2011-08-22
作者:  Liang, Xin[1];  Xiang, Minghui[2];  Yang, Yong[3];  Chen, Qihua[4];  Shu, Zengrong[5]
收藏  |  浏览/下载：4/0  |  提交时间：2019/04/30
Study on desulfurization of SO2 by desulfurization agent of attapulgite compounded with calcium oxide 会议论文
Shangri-La, China, August 22, 2011 - August 23, 2011
作者:  Zhang, Ting;  Yu, Shurong;  Feng, Huixia;  Wang, Yi
收藏  |  浏览/下载：3/0  |  提交时间：2020/11/15
A method of CAE for calculating the temperature tolerance of telescope (EI CONFERENCE) 会议论文
2009 IEEE International Conference on Mechatronics and Automation, ICMA 2009, August 9, 2009 - August 12, 2009, Changchun, China
Xie S.; Zhu X.; Li Q.; Chen C.
收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25
In order to obtain high quality pictures  the thermal design is necessary for the space telescope. The designed temperature scope should meet to the permissible temperature tolerance of the telescope. A method for calculating the permissible temperature tolerance of the telescope is studied. The calculating temperature tolerance will be targeted for space thermal environment adaptive structure design and thermal design. A method for describing the temperature fields of the telescope is introduced. The descriptive temperature fields are able to include every temperature states that the telescope endured on orbit. When the MTF (Modulation Transfer Function) just meet to the optical indicator  the ultimate temperature tolerance of the space telescope is obtained  that is  the aim temperature scope for the thermal design is obtained. 2009 IEEE.  
Modeling and analysis of dialyte-lens auto-focusing technology for theodolite (EI CONFERENCE) 会议论文
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, November 16, 2008 - November 19, 2008, Beijing, China
Wu L.-T.; Qiao Y.-F.; Wu D.-K.; Cai S.
收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25
In order to realize real-time auto-focusing for theodolite  lens-apart method was designed with the corresponding math model built and analyzed. An Object beam splitted after the first image surface of the theodolite traveled through two dialyte lens and then was imaged on CCD. The distance between two spots when exactly focused was set as the calibration value  and the relationship between defocus distance and spot offset was given. The influence of tracking center shift and divergence angle etc. on focusing accuracy was analyzed. Compared with the traditional focusing method  this scheme has a higher accuracy  faster calculation  higher tolerance for environment temperature and a simpler construction. The experiment result exhibited a resolution higher than 0.056mm  which shows a bright engineering application prospect for this method. 2009 SPIE.  
808nm high-power high-efficiency GaAsP/GaInP laser bars (EI CONFERENCE) 会议论文
Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China
Wang Y.; Yang Y.; Qin L.; Wang C.; Yao D.; Liu Y.; Wang L.
收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25
808nm high power diode lasers  which is rapidly maturing technology technically and commercially since the introduction in 1999 of complete kilowatt-scale diode laser systems  have important applications in the fields of industry and pumping solid-state lasers (DPSSL). High power and high power conversion efficiency are extremely important in diode lasers  and they could lead to new applications where space  weight and electrical power are critical. High efficiency devices generate less waste heat  which means less strain on the cooling system and more tolerance to thermal conductivity variation  a lower junction temperature and longer lifetimes. Diode lasers with Al-free materials have superior power conversion efficiency compared with conventional AlGaAs/GaAs devices because of their lower differential series resistance and higher thermal conductivity. 808nm GaAsP/GalnP broad-waveguide emitting diode laser bars with 1mm cavity length have been fabricated. The peak power can reach to 100.9W at 106.5A at quasicontinuous wave operation (200s  1000Hz). The maximum power conversion efficiency is 57.38%. Based on these high power laser bars  we fabricate a 1 3 arrays  the maximum power is 64.3 W in continuous wave mode when the current is 25.0A. And the threshold current is 5.9A  the slope efficiency is 3.37 W/A. 2008 SPIE.  
The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology (EI CONFERENCE) 会议论文
Optical System Alignment and Tolerancing II, August 10, 2008 - August 11, 2008, San Diego, CA, United states
Yan F.; Zhang X.-J.
收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25
The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus  astigmatism  and Petzval curvature  temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced  from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value  it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.  

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