中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
机构
采集方式
内容类型
发表日期
学科主题
筛选

浏览/检索结果: 共8条,第1-8条 帮助

条数/页: 排序方式:
When green transportation backfires: High-speed rail's impact on transport-sector carbon emissions from 315 Chinese cities 期刊论文  OAI收割
SUSTAINABLE CITIES AND SOCIETY, 2024, 卷号: 114, 页码: 105770
作者:  
Ou, Yifu;  Zheng, Ji;  Liang, Yuan;  Bao, Zhikang
  |  收藏  |  浏览/下载:21/0  |  提交时间:2024/10/21
The legacy effects of rubber defoliation period on the refoliation phenology, leaf disease, and latex yield 期刊论文  OAI收割
PLANT DIVERSITY, 2023, 卷号: 45, 期号: 1, 页码: 98-103
作者:  
Zhai,De-Li;  Xu,Jian-Chu
  |  收藏  |  浏览/下载:18/0  |  提交时间:2024/05/09
Evolving competition between Hong Kong and Shenzhen ports 期刊论文  OAI收割
MARITIME POLICY & MANAGEMENT, 2015, 卷号: 42, 期号: 8, 页码: 729-745
作者:  
  |  收藏  |  浏览/下载:21/0  |  提交时间:2018/07/30
通信行业工作特征对员工生活满意度的溢出效应:基于工作要求-资源模型的探索 期刊论文  OAI收割
人类工效学, 2015, 卷号: 21, 期号: 5, 页码: 007-011
作者:  
李颖;  王广曦;  李丹;  李永娟
收藏  |  浏览/下载:46/0  |  提交时间:2016/09/19
Design of stable image platform on airborne camera (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Advanced Design and Manufacturing Engineering, ADME 2011, September 16, 2011 - September 18, 2011, Guangzhou, China
作者:  
Yang L.;  Yang L.
收藏  |  浏览/下载:21/0  |  提交时间:2013/03/25
Modulation transfer function resulting from random vibration was analyzed. To conclude that the effect of angular displacement was the major factor. Allowable MTF degradation was represented  and 34dB reduction was achieved at frequency of 100HZ. With the help of MSC.ADAMS simulation software  and convert allowable MTF degradation into stable system design parameters  simulated curve proves correct for isolator  which can guide perfect design for stabilization system. Based on the spatial mechanism and translational principle of parallelogram  and the irrotational displacement mechanism was tested by optical method  an irrotational displacement isolator was developed. It can meet the requirements of irrotational displacement and damp. An instance was given  coupled angle is less than 8?  it can satisfy the demand of aerial imaging. (2011) Trans Tech Publications.  
Congestion control for industrial wireless communication gateway 会议论文  OAI收割
2010 International Conference on Intelligent Computation Technology and Automation, ICICTA 2010, Changsha, China, May 11-12, 2010
作者:  
Tang Z(唐忠);  Mei, Zhan;  Wang H(王宏)
收藏  |  浏览/下载:28/0  |  提交时间:2016/06/06
Mechanical interleaving assembly of TDICCD focal plane for space camera (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Ren J.-Y.;  Zhang X.-X.
收藏  |  浏览/下载:32/0  |  提交时间:2013/03/25
TDICCD assembly is a major method of acquiring wide field for space camera. For the demand of space camera's wide view field and high resolution  the technique of mechanical interleaving assembly is discussed. Its principle  method of adjusting and testing as well as the structure of focal plane are described. Using mechanical tangent-screws adjusting method  the assembly with TDI CCDs for wide field space camera focal plane is finished on the facility which is composed of a long work-distance microscope and a negative pressure and adsorption guide apparatus. The assembly length of TDICCD focal plane for wide field space camera reaches 560mm  and the measuring error is not more than 3.2 m  the mechanical interleaving assembly method has effect of zero clearance and can achieve good image quality.  
Study on LD-pumped Nd:YAG laser cutter (EI CONFERENCE) 会议论文  OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Zhang G.;  Zhang G.;  Zhang G.;  Zhang J.;  Zhang J.
收藏  |  浏览/下载:28/0  |  提交时间:2013/03/25
The theory of laser cutter and the technology neck is analyzed. We can conclude that it is almost impossible to deal with the waste thick silicon wafers which are yielded in producing silicon wafers by conventional eroding or diamond cutting  when the cutting velocity equals 100mm/min  while it is also unperfected with ecumenical laser cutter without good beam quality or precise laseroptics system. It is represented that high average power and high repetition rate laser with good beam quality and precise laseroptics system are pivotal to obtain excellent cutting effect such as thick groove depth  double-layer 0.75mm thick silicon wafer can be penetrated.. The cross section is fine and the groove is narrow  rapid cutting speed  the cutting quality meets the expecting demand.  fine kerf section without considering the effect of technique. Considering laser medium thermal lens effect and thermal focal length changing with pumping power  using plano-convex high reflectivity mirror as the back cavity mirror to compensate the heat lens influence  a /4 waveplate to compensate heat -induced birefraction  utilize the Nd:YAG self- aperture effect  more than 50 W average power 1.064 um IR output is obtained with beam quality factor (M2) equals 3.19. Through the LD-Pumped Nd:YAG laser cutter we developed with short focus length negative spherical aberration focusing lens  double axis linear step motor positioning system  suitable beam expander multiplying factor  appropriate diameter of exit beam aperture  proper repetition rate  when the cutting velocity equals 400mm/min  0.75mm thick silicon wafer can be penetrated