中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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浏览/检索结果: 共7条,第1-7条 帮助

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Economic Growth and Pollution Emission in China: Structural Path Analysis 期刊论文  OAI收割
SUSTAINABILITY, 2018, 卷号: 10, 期号: 7
作者:  
Yang, Na;  Zhang, Zilong;  Xue, Bing;  Ma, Junxia;  Chen, Xingpeng
  |  收藏  |  浏览/下载:47/0  |  提交时间:2018/12/04
Influence path and effect of climate change on geopolitical pattern SCI/SSCI论文  OAI收割
2012
Wang L. M.; Gu M. C.; Li H. Q.
收藏  |  浏览/下载:29/0  |  提交时间:2014/12/24
Influence path and effect of climate change on geopolitical pattern 期刊论文  OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2012, 卷号: 22, 期号: 6, 页码: 1117-1130
Wang, LM; Gu, MengChen(顾梦琛); Li, HQ
收藏  |  浏览/下载:13/0  |  提交时间:2013/01/09
Simulation and experiment of the static FTIR based on micro multi-step mirrors (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
作者:  
Liang Z.-Z.;  Zhang J.;  Zhang J.;  Zhang J.;  Zhu W.-B.
收藏  |  浏览/下载:30/0  |  提交时间:2013/03/25
In recent years  Fourier transform spectrometer (FTS) with small size and low mass is required in many applications with growing need for real-time and small platform spectral detection. In this paper  a micro Fourier transform infrared spectrometer (FTIR) based on spatial modulation mode was designed. This spectrometer has the advantages of high stability and simplified configuration. It also promises optical path differences (OPD) with high precision  as MOEMS technology is used in manufacturing the key components. The simulation and the experiments with regard to this FTIR configuration have been done. Firstly  the diffraction effect of the micro multi-step mirrors (MMSMs) is studied. We discuss the influence to the reversed spectrum by different mirror widths and different diffraction distances. Secondly  we simulate and analyze the influence of the source solid angle to the spectral resolution. Thirdly  we set up the theoretical model of the collimation error which is mainly from the defocus of the optical system and analyze the result caused by the collimation error. Fourthly  a new discrete Fourier transform arithmetic using least-squares cosines progression (LSCP) is proposed which can reconstruct the spectrum with nonuniform sampled signals. Finally  the MMSMs are fabricated used the MOEMS technology and the structural parameters are tested. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
Impacts of agricultural land management on soil quality after 24 years: a case study in Zhangjiagang County, China 期刊论文  iSwitch采集
NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH, 2011, 卷号: 54, 期号: 4, 页码: 261-273
作者:  
Qi, Y. B.;  Huang, B.;  Darilek, J. L.
收藏  |  浏览/下载:43/0  |  提交时间:2019/10/10
Novel method for optimizing polishing tool-path in CCOS based on weighted-iterative algorithm (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 X.-J.
收藏  |  浏览/下载:40/0  |  提交时间:2013/03/25
In Computer Controlled Optical Surfacing (CCOS)  polishing tool-path is the base of solving other control parameters such as dwell time. In order to improve the fabrication results of polishing off-axis aspheric  a novel method to optimize the tool-path is discussed in this paper. The optimizing method named weighted-iterative algorithm is according to the balance principle of the particle system. The power factor of each dwell point represents the requirement of dwell density. Considering the factors which influence the polishing result  the power factors cosist of three elements include constant  error distribution and dwell distance of workpiece edge. The tool-path is solved by numerical iterative method. In the end  an error data is simulated with actual parameters using the matrix-based algorithm with two different tool-paths. The one is X-Y uniform spacing model and the other one is to optimize it based on the first. The comparison shows that the results of the optimized one are much better than traditional one  especially the rms convergence rate. Theory of the algorithm is simple and exercisable  and it satisfies practical requirement as well. 2009 SPIE.  
The influence investigation of laser cutting path on the resistance of chip resistors (EI CONFERENCE) 会议论文  OAI收割
Lasers in Material Processing and Manufacturing II, November 10, 2004 - November 12, 2004, Beijing, China
作者:  
Wang Z.;  Wang Z.
收藏  |  浏览/下载:18/0  |  提交时间:2013/03/25