中国科学院机构知识库网格系统: 检索

Characteristics of low altitude ionospheric electric field over Hainan Island, China 期刊论文 OAI收割
SCIENCE CHINA-EARTH SCIENCES, 2017, 卷号: 60, 期号: 4, 页码: 770-785
作者: Li RenKang; Chen Tao; Man Feng; Jiang XiuJie; Luo Jing

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收藏 | 浏览/下载：30/0 | 提交时间：2018/02/28

Active Experiments Ionosphere F1-region Electric Fields

Characteristics of Low Altitude Ionospheric Electric Field over Hainan Island 期刊论文 OAI收割
SCIENCE CHINA Earth Sciences, 2016
作者: Li RenKang; Chen Tao; Man Feng; Jiang XiuJie; Luo Jing

收藏 | 浏览/下载：36/0 | 提交时间：2017/01/05

ionosphere active experiments electric fields F1-region

Experiments on fuzzy sliding mode variable structure control for vibration suppression of a rotating flexible beam 期刊论文 OAI收割
Journal of Vibration and Control, 2015, 卷号: 21, 期号: 2, 页码: 343-358
作者: Qiu ZC(邱志成); Han JD(韩建达); Liu JG(刘金国)

收藏 | 浏览/下载：34/0 | 提交时间：2013/12/26

Flexible smart manipulator active vibration control fuzzy sliding mode control experiments variable structure control

Effect of Surfactant Tween 80 on the Anaerobic Degradation and Desorption of HCHs and DDX in Aged Soil under Saturated Condition with Low Liquid/Solid Ratio EI期刊论文 OAI收割
2014
作者: Lei Mei; Chen Tong-Bin

收藏 | 浏览/下载：43/0 | 提交时间：2014/12/31

Soil pollution Bioremediation Desorption Experiments Pesticides Soils Surface active agents

Ionospheric E–F valley observed by a sounding rocket at the low-latitude station Hainan 期刊论文 OAI收割
Annales Geophysicae, 2013, 卷号: 31, 期号: 8, 页码: 1459-1462
J. K. Shi; Z. Wang; K. Torkar; M. Friedrich; X. Wang; C. Liu; Y. B. Guan; G. W. Zhu

收藏 | 浏览/下载：37/0 | 提交时间：2014/04/30

Ionosphere (active experiments equatorial ionosphere) radio science (ionospheric physics)

Numerical simulation on efficient spinning technology based on multi-point adjusting principle (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Manufacturing Science and Engineering, ICMSE 2011, April 9, 2011 - April 11, 2011, Guilin, China
Gong X. P.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In order to realize high efficiency and flexible manufacturing for rotary surfaces equivalent stress in sheet metal's center region and bendable rollers active region exceeds yield stress efficient spinning technology (EST) is researched. It is the combination of multi-point forming and traditional spinning. Principle of EST is described and plastic deformation is generated traditional spinning method is compared with it experimental result accords with simulation result. Feasibility of EST is validated by simulation and experimental results. (2011) Trans Tech Publications. and characteristics of it are analyzed. Finite element analysis (FEA) model of disc-shape part is established EST process is analyzed equivalent stress and plastic strain distributions are analyzed. EST equipment is developed and the experiments are made. Results indicate: EST process consists of four stages

Experimental Comparison Research on Active Vibration Control for Flexible Piezoelectric Manipulator Using Fuzzy Controller 期刊论文 OAI收割
JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS, 2010, 卷号: 59, 期号: 1, 页码: 31-56
作者: Wei JJ(魏井君); Qiu ZC(邱志成); Han JD(韩建达); Wang YC(王越超)

收藏 | 浏览/下载：20/0 | 提交时间：2012/05/29

Flexible manipulator Active vibration control Fuzzy logic Smart structure Experiments

Geometrical modulation transfer function of different active pixel of CMOS APS (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 2, 2005 - November 5, 2005, Zian, China
作者: Li J.; Liu J.; Liu J.; Liu J.; Li J.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

The geometrical Modulation Transfer Function (MTF) of CMOS APS (active pixel sensor) is analyzed in this paper. Advanced APS have been designed and fabricated where different pixel shapes such as square rectangle and L shape were placed because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area. MTF is an important figure of merit in focal plane array imaging sensors. Research on analyzing the MTF for the proper pixel shape is currently in progress for a centroidal configuration of a target position. MTF will give us a more complete understanding of the tradeoffs opposed by the different pixel designs and by the signal processing conditions. Based on image sensor sampling and reconstructing model the MTF expression of any active pixel shape has been deduced in this paper. According to actual pixel shape three different active area pixels were analyzed they were square rectangle and L shape their Fill Factor (FF) is 30% 44% and 55% respectively. Results of simulation experiments indicate that different pixel geometrical characteristics contribute significantly to the figures of their MTF. Different geometrical shape of active sensitive area of pixel and different station in pixel would influence MTF figures. The analysis results are important in designing better APS pixel and more important in analyzing imaging system performance of APS subpixel precision system.

Design of an improved data signal timing for an amorphous silicon active-matrix organic LED display (EI CONFERENCE) 会议论文 OAI收割
ICO20: Display Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Zhang Z.-W.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

The most critical issue in the design of an active matrix organic light emitting diode (AM-OLED) display pixel is the pixel to the pixel luminance uniformity. By substituting four-thin film transistor (TFT) pixel circuit for two-TFT pixel circuit the luminous uniformity has great improved but it requires more components than the two-TFT pixel circuit. There are some barriers needed to resolve to utilize hydrogenated amorphous silicon transistor to lit OLED such as low field effect mobility low output current and threshold voltage shift. In this article a two-a-Si:H TFT pixel circuit was designed which consisted of one named switching TFT and the other named driving TFT. The driving TFT gate line structure modified and a data signal timing improved were reported. The modified driving TFT can provide enough current about 30 microampere to lit OLED and the novel data signal timing can provide a constant current to OLED by restraining the driving TFT threshold voltage variation. In the novel data signal timing the control signals to the driving TFT gate include a data signal and a reverse data signal. The signals alteration is performed either at a frame rate or at a line rate. By experiments the driving TFT output current value is plotted as a function of the time in different reversed voltage value. When the magnitude of the positive data signal and the negative data signal is equal the variety of Vth is smallest about 1.28V after a fixed stressing time of 1.33104min which shows the novel data signal timing can improved the driving TFT output-input current stability.

Active pixel sensor geometrical characteristic effects on star image subdivided locating accuracy for star tracker (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: Liu J.; Liu J.; Liu J.; Li J.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Active pixel sensor (APS) star tracker becomes an investigated hotspot because of its technical advantages. And centroid algorithm is a subpixel method proper to star position calculation because of its high accuracy and simplicity. When centroid algorithm is applied on APS star tracker APS pixel geometrical characteristics might effect on star image position accuracy. Because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area the Fill Factor is less than 100%. Moreover the active sensitive area has a certain geometrical shape such as square rectangle and L shape. The Fill Factor of pixel influences on star image subdivided locating accuracy when using centioid algorithm. In this paper we have analyzed all pixel geometrical characteristics influence on the star position accuracy. From simulation experiments we can conclude that Fill factor and pixel geometric shape influence on star position accuracy. The star locating error increased when Fill Factor decreased and different geometrical shape of active sensitive area of pixel can make different influence on star location accuracy the symmetrical sensitive area in x or y axis have symmetrical location error in the same axis.