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	Energy geopolitics in Central Asia: China's involvement and responses 期刊论文 OAI收割 JOURNAL OF GEOGRAPHICAL SCIENCES, 2020, 卷号: 30, 期号: 11, 页码: 1871-1895 作者: Zhou Qiang; He Ze; Yang Yu \| 收藏 \| 浏览/下载：15/0 \| 提交时间：2021/03/15 energy geopolitics risk Central Asia policy frameworks guarantee mechanism energy cooperation China
	Energy geopolitics in Central Asia: China's involvement and responses 期刊论文 OAI收割 JOURNAL OF GEOGRAPHICAL SCIENCES, 2020, 卷号: 30, 期号: 11, 页码: 1871-1895 作者: Zhou Qiang; He Ze; Yang Yu \| 收藏 \| 浏览/下载：14/0 \| 提交时间：2021/03/15 energy geopolitics risk Central Asia policy frameworks guarantee mechanism energy cooperation China
	Energy geopolitics in Central Asia:China's involvement and responses 期刊论文 OAI收割 Journal of Geographical Sciences, 2020, 卷号: 30, 期号: 11, 页码: 1871 作者: Zhou Qiang; He Ze; Yang Yu \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2021/03/16 energy geopolitics risk Central Asia policy frameworks guarantee mechanism energy cooperation China
	Energy geopolitics in Central Asia:China's involvement and responses 期刊论文 OAI收割 Journal of Geographical Sciences, 2020, 卷号: 30, 期号: 11, 页码: 1871 作者: Zhou Qiang; He Ze; Yang Yu \| 收藏 \| 浏览/下载：7/0 \| 提交时间：2021/03/16 energy geopolitics risk Central Asia policy frameworks guarantee mechanism energy cooperation China
	Design and optimization of supporting structure for scanning mirror in aviation remote sensor (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China 作者: Yang H. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 An optical supporting structure is studied to improve its structure stiffness and reduce the rotate error to meet the requirement of aviation remote sensor. A formula to calculate fundamental frequency is proposed using Rayleigh-Ritz method and a method of is analyzed. By means of OPTISTRUCT software the maximum fundamental frequency is converted to object function the deformation under the gravity and the mass are assigned to state variable wall thicknesses of the structure are converted to design variables. The analysis and test results indicate that the fundamental frequency of designed optical supporting structure has been improved 37.2 Hz from 96.9 Hz which guarantee the reliability of the sweep mechanism and the rotate error is 4.89 which is satisfied for the rotate accuracy in plunge angle. The method of optimization has a certain instructional significance for the design of supporting structures in aviation remote sensor. 2011 IEEE.
	Accuracy analysis and optimization design of constant-diameter cam (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China Yuan G.-Q.; Ding Y.-L.; Hui S.-W.; Liu Z.-H.; Li Y.-W. 收藏 \| 浏览/下载：35/0 \| 提交时间：2013/03/25 A constant-diameter cam gets its name because the centers of the rollers are a constant distance apart. This paper presents an Accuracy analysis and optimization design method for constant-diameter cam mechanism. Factors affecting the accuracy of cam are studied in the paper. The influences of the roller radial runout cam machining error and the base circle radius on accuracy are analyzed. Then a method to guarantee the cam diameter constant and remove return stroke error is studied using least-squares method. The analysis results indicate that the focusing accuracy can reach 4.4m and the return stroke error can reach 4.8m the functioning of institutions is stable and reliable. 2011 IEEE.
	The design of high speed image acquisition system over Gigabit Ethernet (EI CONFERENCE) 会议论文 OAI收割 2010 IEEE International Conference on Wireless Communications, Networking and Information Security, WCNIS 2010, June 25, 2010 - June 27, 2010, Beijing, China 作者: Zhang W.; He X.; Zhang W. 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/03/25 The applications based on traditional digital cameras have been limited by distance cost and networking. Gigabit Ethernet is a data transmission standard based on the IEEE 802.3 protocol brings several benefits to image transmission. In this paper we compare the main features of Gigabit Ethernet and traditional digital camera interfaces. And we design a high speed image acquisition system which overcomes these application limitations by allowing cameras to send imaging data over Gigabit Ethernet. In this system we design a highly efficient bidirectional conversion device based on FPGA converts imaging data from a camera to IP packets based on UDP protocol and sends it to PCs over inexpensive Cat-5 copper LAN cable. At the PC the Cat-5 cable plugs into a standard Gigabit Ethernet NIC(network interface card) eliminating the need for a frame grabber. An communications application software is used to acquire the network data construct and display the image. A simple and efficient acknowledge and resend mechanism was used to guarantee packet delivery. The system architecture and the communication protocol are discussed in details the experiment and results are presented in this paper. 2010 IEEE.
	我国环境基准向环境标准转化的机制探讨学位论文 OAI收割硕士, 北京: 中国科学院研究生院, 1990 作者: 毕岑岑收藏 \| 浏览/下载：98/0 \| 提交时间：2017/01/09 环境基准 environmental criteria 环境标准 environmental standards 转化机制 transformation mechanism 影响因子 affecting factors 政策保障 policy guarantee 水质基准 water quality criteria 水质标准 water quality standard