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A facile method to improve the stability and efficiency of CsPbI2Br perovskite solar cells prepared at low temperature 期刊论文  OAI收割
SOLAR ENERGY, 2020, 卷号: 195, 页码: 544-551
作者:  
Liu, Hongsha;  Xiao, Xiudi;  Bi, Zhuoneng;  Wang, Jixi;  Liu, Yangbiao
  |  收藏  |  浏览/下载:35/0  |  提交时间:2020/10/29
Quantitative analysis of oxygen content in copper oxide films using ultra microbalance 会议论文  OAI收割
The 29th International Symposium on Rarefied Gas Dynamics, 中国陕西西安, 2014-07-13
作者:  
Shu YH(舒勇华);  Liu C(刘崇);  Wang LH(王连红);  Fan J(樊菁)
收藏  |  浏览/下载:36/0  |  提交时间:2015/09/10
The imaging system design of three-line LMCCD mapping camera (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
作者:  
Zhao Y.;  Yu D.;  Yu D.;  Zhao Y.;  Zhao Y.
收藏  |  浏览/下载:21/0  |  提交时间:2013/03/25
In this paper  the SNR tested in laboratory is better than 95 under typical working condition(the solar incidence degree is 30  the temperature of the focal plane module is controlled under 30 in a working period of 15 minutes. All of these results can satisfy the requirements about the synchronous photography  the authors introduced the theory about LMCCD (line-matrix CCD) mapping camera firstly. On top of the introduction were consists of the imaging system of LMCCD mapping camera. Secondly  the photography interval of line-matrix CCD of the nadir camera can satisfy the butter requirements of LMCCD focal plane module  the reflectivity of the earth's surface is 0.3) of each CCD image  the temperature control of focal plane module and SNR  some pivotal designs which were Introduced about the imaging system  Which give the guarantee of precision for satellite photogrammetry. 2011 SPIE.  such as the design of focal plane module  the video signal's procession  the controller's design of the imaging system  synchronous photography about forward and nadir and backward camera and the nadir camera of line-matrix CCD. At last  the test results of LMCCD mapping camera imaging system were introduced. The results as following: the precision of synchronous photography about forward and nadir and backward camera is better than 4 ns and the nadir camera of line-matrix CCD is better than 4 ns too  
Design of image nonuniformity correction and real-time record for CMOS camera (EI CONFERENCE) 会议论文  OAI收割
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
Huilong Y.; Xin H.; Zhonghui W.; Donghe W.
收藏  |  浏览/下载:24/0  |  提交时间:2013/03/25
A configurable  record capacity extensible and nonuniformity reducible of high speed camera is designed in this paper. The CMOS image sensor lupa-300 which is produced by Cypress Corporation is used for the system. There is nonuniformity existed in the sensor. The two point method of the image with real time correction algorithm has applied to process the image nonuniformity. Then the corrected image is storied into the NandFlash array. To improve the record speed and extend record capacity  the pipelining and parallel bus mechanism is adopted. The experiment which is based on hardware platform indicates the camera can take about 250f/s at a resolution of 640*480  the consistent storage speed is up to 614.4 Mb/s  consistent transmit from flash to Camera Link speed up to 1.093Gb/s.The system record time is up to 18.6 minutes. 2009 IEEE.  
The compression and storage method of the same kind of medical images-DPCM (EI CONFERENCE) 会议论文  OAI收割
4th International Conference on Photonics and Imaging in Biology and Medicine, September 3, 2005 - September 6, 2005, Tianjin, China
作者:  
Liu H.;  Liu H.;  Liu H.
收藏  |  浏览/下载:19/0  |  提交时间:2013/03/25
Medical imaging has started to take advantage of digital technology  opening the way for advanced medical imaging and teleradiology. Medical images  however  require large amounts of memory. At over 1 million bytes per image  a typical hospital needs a staggering amount of memory storage (over one trillion bytes per year)  and transmitting an image over a network (even the promised superhighway) could take minutes - too slow for interactive teleradiology. This calls for image compression to reduce significantly the amount of data needed to represent an image. Several compression techniques with different compression ratio have been developed. However  the lossless techniques  which allow for perfect reconstruction of the original images  yield modest compression ratio  while the techniques that yield higher compression ratio are lossy  that is  the original image is reconstructed only approximately Medical imaging poses the great challenge of having compression algorithms that are lossless (for diagnostic and legal reasons) and yet have high compression ratio for reduced storage and transmission time. To meet this challenge  we are developing and studying some compression schemes  which are either strictly lossless or diagnostically lossless  taking advantage of the peculiarities of medical images and of the medical practice. In order to increase the Signal to-Noise Ratio (SNR) by exploitation of correlations within the source signal  a method of combining differential pulse code modulation (DPCM) is presented.  
Error analysis and test study of fiber optic gyroscope north-finder (EI CONFERENCE) 会议论文  OAI收割
Advanced Sensor Systems and Applications II, November 8, 2004 - November 12, 2004, Beijing, China
Zhang Z.; Sun J.; Wu K.
收藏  |  浏览/下载:22/0  |  提交时间:2013/03/25
North-finder system is an important application of the inertial technology. It provides true north azimuth information to f all kinds of ground-based equipment. This paper designed a dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG). In this scheme  the sine output signal of the FOG was sampled and disposed  and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the base tilt was compensated by an accelerator. The output signals of FOG and accelerator were computed combined with the position sampled from increasing encoder by digital signal processor. Successive rotating technique was adopted to modulate the FOG signal periodically. Most of the low frequency part of random gyro drift errors was compensated. The north-finder accuracy was improved compared with the traditional static measuring method. The test result shows the FOG automatic north-finder obtains 2' true north angle accuracies within not more than three minutes  can meet the orientation need of artillery  terrain measurement vehicle  armored car  unmanned drive vehicle  geodetic survey and tunnel exploration.