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6条,第1-6条 帮助

条数/页: 排序方式:
High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-500 GeV with the Alpha Magnetic Spectrometer on the International Space Station 期刊论文  OAI收割
PHYSICAL REVIEW LETTERS, 2014, 卷号: 113, 期号: 12
作者:  
AMS Collaboration
收藏  |  浏览/下载:150/0  |  提交时间:2015/12/02
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-350 GeV 期刊论文  OAI收割
PHYSICAL REVIEW LETTERS, 2013, 卷号: 110, 期号: 14
作者:  
AMS Collaboration
收藏  |  浏览/下载:148/0  |  提交时间:2015/12/02
Design and performance study of the LEPD silicon tracker onboard the CSES satellite 期刊论文  OAI收割
Chinese Physics C, Chinese Physics C, 2013, 2013, 期号: 2, 页码: 61-67, 61-67
作者:  
Wu F(吴峰);  Wang HY(王焕玉);  Zhao XY(赵小芸);  Meng XC(孟祥承);  Xu YB(徐岩冰)
  |  收藏  |  浏览/下载:37/0  |  提交时间:2015/12/15
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.  
Measuring the system gain of the TDI CCD remote sensing camera (EI CONFERENCE) 会议论文  OAI收割
Advanced Materials and Devices for Sensing and Imaging II, November 8, 2004 - November 10, 2004, Beijing, China
Ya-xia L.; Hai-ming B.; Jie L.; Jin R.; Zhi-hang H.
收藏  |  浏览/下载:68/0  |  提交时间:2013/03/25
The gain of a TDI CCD camera is the conversion between the number of electrons recorded by the TDI CCD and the number of digital units (counts) contained in the CCD image"[1]. TDI CCD camera has been a main technical approach for meeting the requirements of high-resolution and lightweight of remote sensing equipment. It is useful to know this conversion for evaluating the performance of the TDI CCD camera. In general  a lower gain is better. However  the resulting slope is the gain of the TDI CCD. We did the experiments using the Integration Sphere in order to get a flat field effects. We calculated the gain of the four IT-EI-2048 TDI CCD. The results and figures of the four TDI CCD are given.  this is only true as long as the total well depth (number of electrons that a pixel can hold) of the pixels can be represented. High gains result in higher digitization noise. System gains are designed to be a compromise between the extremes of high digitization noise and loss of well depth. In this paper  the mathematical theory is given behind the gain calculation on a TDI CCD camera and shows how the mathematics suggests ways to measure the gain accurately according to the Axiom Tech. The gains were computed using the mean-variance method  also known as the method of photon transfer curves. This method uses the effect of quantization on the variance in the measured counts over a uniformly illuminated patch of the detector. This derivation uses the concepts of signal and noise. A linear fit is done of variance vs. mean  
Study of multiphoton final states and tests of QED in e(+)e(-) collisions at root s up to 209 GeV 期刊论文  OAI收割
PHYSICS LETTERS B, 2002, 卷号: 531, 期号: 1--2, 页码: 28-38
-
收藏  |  浏览/下载:17/0  |  提交时间:2015/12/02