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浏览/检索结果: 共8条,第1-8条 帮助

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The effect of topography on landslide kinematics: a case study of the Jichang town landslide in Guizhou, China 期刊论文  OAI收割
LANDSLIDES, 2020, 卷号: 17, 期号: 4, 页码: 959-973
作者:  
Guo Jian;  Yi Shujian;  Yin Yanzhou;  Cui Yifei;  Qin Mingyue
  |  收藏  |  浏览/下载:39/0  |  提交时间:2020/05/18
Soil moisture as a key factor in carbon release from thawing permafrost in a boreal forest 期刊论文  OAI收割
GEODERMA, 2020, 卷号: 357, 页码: 113975
作者:  
Song Xiaoyan;  Wang Genxu;  Ran Fei;  Huang Kewei;  Sun Juying
  |  收藏  |  浏览/下载:163/0  |  提交时间:2019/12/06
The effect of temperature distribution on reflectors in satellite optical terminals 会议论文  OAI收割
Nanjing, PEOPLES R CHINA, 2017-10-24
作者:  
Wang Chenjie;  Shangguan Aihong;  Chai Wenyi;  Hu Yongming;  Tao, Wenquan
  |  收藏  |  浏览/下载:38/0  |  提交时间:2018/07/05
Experimental Warming Aggravates Degradation-Induced Topsoil Drought in Alpine Meadows of the Qinghai-Tibetan Plateau 期刊论文  iSwitch采集
LAND DEGRADATION & DEVELOPMENT, 2017, 卷号: 28, 期号: 8, 页码: 2343-2353
作者:  
Xue, Xian;  You, Quangang;  Peng, Fei;  Dong, Siyang;  Duan, Hanchen
收藏  |  浏览/下载:50/0  |  提交时间:2019/10/09
Determining wind field and electric field by a barium release experiment in the ionosphere 期刊论文  OAI收割
SCIENCE CHINA-EARTH SCIENCES, 2015, 卷号: 58, 期号: 7, 页码: 1210-1215
作者:  
Xie LiangHai;  Li Lei;  Wang JingDong;  Tao Ran
收藏  |  浏览/下载:28/0  |  提交时间:2015/09/28
A study on atmospheric turbulence effects in full-optical free-space communication systems (EI CONFERENCE) 会议论文  OAI收割
2010 6th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2010, September 23, 2010 - September 25, 2010, Chengdu, China
作者:  
Liu P.
收藏  |  浏览/下载:21/0  |  提交时间:2013/03/25
Next generation free-space optical communication systems have used fiber-optic technology as the seamless connection between free-space and optical fiber. The full-optical free-space optical communication systems use optical fiber as the receiver to get faster communication speed. The atmospheric turbulence deeply influenced on the optical wave propagated in terrestrial application. As the active receiving area of the full-optical free-space optical communication systems is very small  it is important to research on the atmospheric turbulence effects on the full-optical free-space optical communication system. In this paper  we discuss about both the turbulence-induced intensity fluctuations and the angle-of-arrival effects in full-optical free-space optical communication systems which are used in a few kilometers communication. We gave the numerical results of the atmosphere turbulence effects on the free-space optical communication systems. In order to minimize the atmospheric turbulence influence on the full-optical free-space optical communications system  we also investigate the use of fine tracking system in the communication system. We have set up a full-optical free-space communication system in Tokyo and received useful data from the experiment. We compared the receiving power of the experiment  when the fine tracking system is On and Off. From the experiment results  we can see that the fine tracking system effectively mitigates the atmospheric turbulence and increases the receiving power of the communication system. 2010 IEEE.  
High power vertical cavity surface-emitting laser with high reliability (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
Changling Y.; Guoguang L.; Chunfeng H.; Li Q.
收藏  |  浏览/下载:16/0  |  提交时间:2013/03/25
Support technique of ultra thin mirror in space optics (EI CONFERENCE) 会议论文  OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 2, 2005 - November 5, 2005, Xian, China
作者:  
Ren J.-Y.;  Gao M.-H.
收藏  |  浏览/下载:31/0  |  提交时间:2013/03/25
With the development of space optical system  the technique of ultra thin mirror come forth and is paid more attention because of less difficulty in machining  low cost  lightweight  no disassembly during detecting and maintaining. The key technique takes advantage of deformation of ultra thin mirror as the influence of environment to adjust the surface figure. Its accuracy meets requirement. An analysis method is based on finite element analysis (FEA)  and many items  including the amount of support points  the way of arrangement  the optimum design of support component are studied. The finite element method was used to analyze the mirror and some different mirror support schemes. The principal aim of the mirror analysis is to get numbers of support points and the ways of the support. There are three schemes including 12-6-1  12-8-1 and 16-8-1 models. Deformation of deadweight is calculated under the three conditions. The way of 16-8-1 is more suitable than the designs of other two. The support subassembly is amended to meet with the mirror surface RMS in the range of 30m. Deformation of the mirror with support structure has been calculated. The result is 16.52nm  lower than a quarter of the wavelength  which indicates the feasibility of the support scheme applied to mirror. Theoretical result for the best way of support is presented. The result of analysis shows that requirement surface figure could be met through adjusting support points. It predicts feasibility of the support technique and provides theoretical value for active adjustment in the laboratory. At present  support and adjusting experiment of ultra thin mirror is being carried on.