中国科学院机构知识库网格系统: 检索

The possibilities of internationalism: Producing traveling geographies in a time of trouble 期刊论文 OAI收割
DIALOGUES IN HUMAN GEOGRAPHY, 2023
作者: Cheng, Han

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收藏 | 浏览/下载：6/0 | 提交时间：2023/07/14

critical Chinese geographies international research new cold war sinophobia positionality transnationalism

China's Detonation-driven Shock Tube Wind Tunnels: A Case Study of Transnational Science in Aeronautics during the Cold War 期刊论文 OAI收割
EAST ASIAN SCIENCE TECHNOLOGY AND SOCIETY-AN INTERNATIONAL JOURNAL, 2021, 页码: 28
作者: Zhihu, Zhang; Seely, Bruce E.

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收藏 | 浏览/下载：15/0 | 提交时间：2022/07/01

Shock tubes wind tunnels China international collaboration technology transfer research & development aerospace technology Cold War

Progress in international geopolitical research from 1996 to 2015 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2017, 卷号: 27, 期号: 4, 页码: 497-512
作者: Song, Tao; Lu, Dadao; Liang, Yi; Wang, Qian; Lin, Jing

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收藏 | 浏览/下载：16/0 | 提交时间：2019/09/26

geopolitics discipline development scientometrics international research progress

Modelling the basic research competitiveness index (br-ci) with an application to the biomass energy field 期刊论文 iSwitch采集
Scientometrics, 2016, 卷号: 108, 期号: 3, 页码: 1221-1241
作者: Zhang, Yi; Kou, Mingting; Chen, Kaihua; Guan, Jiancheng; Li, Yuchen

收藏 | 浏览/下载：48/0 | 提交时间：2019/05/09

Basic research performance International comparison Basic research competitiveness index Modelling and empirical study Biomass energy field

Fostering ecological data sharing: collaborations in the International Long Term Ecological Research Network SCI/SSCI论文 OAI收割
2015
作者: Vanderbilt K. L.; Lin, C. C.; Lu, S. S.; Kassim, A.; He, H. L.

收藏 | 浏览/下载：36/0 | 提交时间：2015/12/09

collaboration culture data sharing ecological networks ILTER information management LTER long term ecological research metadata multilingual Special Feature: International LTER climate-change big data biodiversity information system management metadata pattern future sites

国际合作科研经费投入与产出效率的实证分析--以新疆生态地理研究所为例/An empirical analysis of international cooperation research input and output efficiency--Taking Xinjiang institute of ecology and geography as an example[J] 期刊论文 OAI收割
大众科技, 2014, 卷号: 7, 页码: 217-219
作者: 刘文文; 新疆财经大学,新疆乌鲁木齐,830012

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收藏 | 浏览/下载：23/0 | 提交时间：2017/12/29

国际合作科研经费投入产出实证研究 International Cooperation In Scientific Research Funds Input Output Empirical Research

Functions and limitations of farmer cooperatives as innovation intermediaries: Findings from China SCI/SSCI论文 OAI收割
2014
作者: Yang H.

收藏 | 浏览/下载：33/0 | 提交时间：2014/12/24

Farmer cooperatives Innovation intermediaries Network building Agricultural innovation systems international agricultural-research sub-saharan africa technological-change systems perspective networks management extension knowledge support

Development situation and trend of domestic and international aerial mapping camera (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
Ming L. W.; Xue L.; Hui C. X.; Jun L. Q.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

In the modern military affairs especially in the complex field the acquirement of real-time battlefield information and intelligence is getting more and more important most of this work is completed by aerial reconnaissance or aerial mapping equipment. Aerial mapping camera with time-sensitive and flexible features is playing an increasingly important role in modern warfare. With the development of technology aerial mapping camera has also gone through several generations gradually from film-based type to transmission type. The theory and composition of domestic and international typical aerial mapping camera is introduced from the development situation and trend in this paper. Finally with the domestic research status the development trend of aerial mapping camera is proposed. 2011 IEEE.

Research on automatic Hartmann test of membrane mirror (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang P.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

Electrostatic membrane mirror is ultra-lightweight and easy to acquire a large diameter comparing with traditional optical elements so its development and usage is the trend of future large mirrors. In order to research the control method of the static stretching membrane mirror the surface configuration must be tested. However membrane mirror's shape is always changed by variable voltages on the electrodes and the optical properties of membrane materials using in our experiment are poor so it is difficult to test membrane mirror by interferometer and null compensator method. To solve this problem an automatic optical test procedure for membrane mirror is designed based on Hartmann screen method. The optical path includes point light source CCD camera splitter and diffuse transmittance screen. The spots' positions on the diffuse transmittance screen are pictured by CCD camera connected with computer and image segmentation and centroid solving is auto processed. The CCD camera's lens distortion is measured and fixing coefficients are given to eliminate the spots' positions recording error caused by lens distortion. To process the low sampling Hartmann test results Zernike polynomial fitting method is applied to smooth the wave front. So low frequency error of the membrane mirror can be measured then. Errors affecting the test accuracy are also analyzed in this paper. The method proposed in this paper provides a reference for surface shape detection in membrane mirror research. 2010 Copyright SPIE - The International Society for Optical Engineering.

Influence of spatial temperature distribution on high accuracy interferometric metrology (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Yang H.; Zhang J.; Zhang J.; Zhang J.; Yan F.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

We calculate the influence of temperature change on the refractive index of air establish a model of air temperature distribution and analyze the effect of different temperature distribution on the high accuracy interferometric metrology. First a revised Edlen formula is employed to acquire the relation between temperature and refractive index of air followed by introducing the fixed temperature gradient distribution among the spatial grid within the optical cavity between the reference flat and the test flat of the Fizeau interferometer accompanied by a temperature change random function within each grid. Finally all the rays through the air layer with different incident angles are traced by Matlab program in order to obtain the final output position angle and OPD for each ray. The influence of different temperature distribution and the length of the optical cavity in on the testing accuracy can be analyzed through the RMS value that results from repeatable rays tracing. As a result the horizontal distribution (vertical to optical axis) has a large effect on the testing accuracy. Thus to realize the high accuracy figure metrology the horizontal distribution of temperature must be rigorously controlled as well as to shorten the length of the optical cavity to a large extent. The results from our simulation are of great significant for the accuracy analysis of interferometric testing and the research of manufacturing a interferometer. 2010 Copyright SPIE - The International Society for Optical Engineering.