中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共5条，第1-5条

帮助

条数/页：排序方式：
	The thermal effect of strengthening measures in an insulated embankment in a permafrost region 期刊论文 iSwitch采集 Cold regions science and technology, 2015, 卷号: 116, 页码: 49-55 作者: Hou Yandong; Wu Qingbai; Liu Yongzhi; Zhang Zhongqiong; Gao Siru 收藏 \| 浏览/下载：33/0 \| 提交时间：2019/05/10 Qinghai-xizang railway Strengthening measures Permafrost table Second rising process
	LABTM control system based on FPGA (EI CONFERENCE) 会议论文 OAI收割 2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan 作者: Wang Y.; Yu P.; Yu P.; Wang Y.; Wang Y. 收藏 \| 浏览/下载：153/0 \| 提交时间：2013/03/25 This paper presents the digital PI control method for design and simulation of a high precision limited angle brushless torque motor control system in Field Programmable Gate Array device (FPGA). The direct drive structures which are widely applied in many servo control fields. Matlab Xilinx System GeneratorR toolbox based on Fixed-Point Arithmetic is used to design the digital PI controller using DSP architecture plot the responses of the control system and generate the VHDL source code. The control system model consists of a digital PI a real LABTM and a real absolute Inductosyn encoder to rpm and position blocks. Through loading generated codes in process of the simulation that built by the digital discrete model it is verified that the rising time of current loop is only 1.2ms and rate loop is 8ms overshoot is rarely 4.2%. Finally the comprehensive positioning accuracy of system can reach up to 5 arc sec and the rate jitter achieves 5% with the 4 arc sec accuracy absolute Inductosyn. (2013) Trans Tech Publications Switzerland.
	Study of microsphere plate photomultiplier tube (EI CONFERENCE) 会议论文 OAI收割 ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China 作者: Wang X.; Li Y.; Li Y.; Li Y.; Li Y. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 The photomultiplier tube (PMT) that can work in different wavelength is an important detector device in remote sense technology. Microsphere plate using glass beads 50to 70m in diameter sintered together is the core component of the microsphere plate photomultiplier tube It is a novel two-dimension electron multiplier. The electrons gain for a single plate is about 1017 and do not have the phenomenon of ion-feedback. Furthermore the fabrication process is very easy. In this paper much interest was put on the microsphere plate photomultiplier tube. Based on the analyses from the theory and the experiment result we point out the key technology for fabricating PMT is how to obtain glass beads with narrow range in diameter and how to sinter the glass beads with a sufficient pylome. Factors affect the gradating technology and sintering process along with the solution to them is presented. In the last the structure scheme and technological characteristic for fabricating microsphere plate photomultiplier tube were given. The pulse rising-time of MSP-PMT is below 400ps suitable to the detection of high-speed pulse. As easy to be fabricated and has great advantage over MCP multiplier in the ratio of performance to price the microsphere plate photomultiplier tube is a promising dim-light detector.
	Rising process of the Qinghai-Xizang (Tibet) plateau and its mechanism 期刊论文 OAI收割 SCIENCE IN CHINA SERIES D-EARTH SCIENCES, 1996, 卷号: 39, 期号: 4, 页码: 369-379 作者: Zhong, DL; Ding, L \| 收藏 \| 浏览/下载：10/0 \| 提交时间：2018/09/26 Fission-track Dating Rising Process Mechanisms Of Uplift Qinghai-xizang Plateau
	Rising process of the Qinghai-Xizang (Tibet) plateau and its mechanism 期刊论文 OAI收割 SCIENCE IN CHINA SERIES D-EARTH SCIENCES, 1996, 卷号: 39, 期号: 4, 页码: 369-379 作者: Zhong, DL; Ding, L \| 收藏 \| 浏览/下载：28/0 \| 提交时间：2018/09/26 Fission-track Dating Rising Process Mechanisms Of Uplift Qinghai-xizang Plateau