中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共8条，第1-8条

帮助

条数/页：排序方式：
	Prehistoric trans-continental cultural exchange in the Hexi Corridor, northwest China 期刊论文 OAI收割 HOLOCENE, 2018, 卷号: 28, 期号: 4, 页码: 621-628 作者: Dodson, John; Chen, Fahu; Cui, Yifu; Li, Haiming; Yang, Yishi \| 收藏 \| 浏览/下载：34/0 \| 提交时间：2018/09/25 Archaeobotany Culture Elements Hexi Corridor Long-distance Cultural Communication Neolithic And Bronze Ages Radiocarbon Dating
	Prehistoric trans-continental culturalexchange in the Hexi Corridor,northwest China 期刊论文 OAI收割 The Holocene, 2017, 卷号: 28, 期号: 4, 页码: 621-628 作者: Dong,GH(Dong,Guanghui); Yang,YS(Yang,Yishi); Liu,XY(Liu,Xinyi); Dong,Guanghui; Li,HM(Li,Haiming) \| 收藏 \| 浏览/下载：45/0 \| 提交时间：2018/10/10 Archaeobotany Culture Elements Hexi Corridor Long-distance Cultural Communication Neolithic And Bronze Ages Radiocarbon Dating
	A power analysis model for outdoor long-distance visible light communication 会议论文 OAI收割作者: Chen QR; Zheng WB; Zhang T; Cui WN; Cui Z \| 收藏 \| 浏览/下载：26/0 \| 提交时间：2018/11/20 visible light communication channel modeling long-distance visible light communication power analysis
	A new low-bandwidth and wireless transmission scheme for CCd image (EI CONFERENCE) 会议论文 OAI收割 2012 International Symposium on Photonics and Optoelectronics, SOPO 2012, May 21, 2012 - May 23, 2012, Shanghai, China 作者: Zhang Y. 收藏 \| 浏览/下载：37/0 \| 提交时间：2013/03/25 The CCD (Charge-coupled Device) image sensor with its high resolution is capable of providing high definition image. However transmission requires high bandwidth which makes it very difficult to process and transmit in a long distance. The purpose of this paper is to propose a new method to process and transmit CCD image which can guarantee a low-bandwidth and long-distance data transmission. The innovation is that the transmission content of CCD image data can be flexibly selected and compressed firstly which will reduce the transmission data. Then it is processed on the base of communication protocol so that it can be fit for wireless transmission. At last it is transformed into wireless signal and transmitted using 3G technology. As a result the paper presents a wireless transmission scheme with the rate of 1.5Mbps for CCD image. 2012 IEEE.
	The design of high-speed optical fiber communication system based on PCI bus (EI CONFERENCE) 会议论文 OAI收割 2010 2nd IEEE International Conference on Advanced Management Science, ICAMS 2010, July 9, 2010 - July 11, 2010, Chengdu, China 作者: Zhang L.-G.; Zhang L.-G.; He X. 收藏 \| 浏览/下载：59/0 \| 提交时间：2013/03/25 In order to increase the transmission distance and reduce noise effectively a communication system with the optical fiber interface is developed in this paper. In the system the PCI bus is adopted as the connection bus between the underlying optical fiber transceiver module circuitry and host computer using the WDM driver. The FPGA is the core logic of the whole system responsible for data transmission and timing logic control. The module structure and the design method of the PCI bus the principle and the design of optical interface module and the bottom-driven development are described in this paper. The experiment results show that the system has basically meet requirement targets. It can achieve the maximum transfer rate of 40MBps when running in the DMA mode. With long transmission distance strong antiinterference and high scalability this system has stable and reliable performance. 2010 IEEE.
	Analysis of laser jamming to satellite-based detector (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China 作者: Guo L.-H.; Guo R.-H.; Wang S.-W. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 The reconnaissance satellite communication satellite and navigation satellite used in the military applications have played more and more important role in the advanced technique wars and already become the significant support and aid system for military actions. With the development of all kinds of satellites anti-satellite laser weapons emerge as the times require. The experiments and analyses of laser disturbing CCD (charge coupled detector) in near ground have been studied by many research groups but their results are not suitable to the case that using laser disturbs the satellite-based detector. Because the distance between the satellite-based detector and the ground is very large it is difficult to damage it directly. However the optical receive system of satellite detector has large optical gain so laser disturbing satellite detector is possible. In order to determine its feasibility the theoretical analyses and experimental study are carried out in the paper. Firstly the influence factors of laser disturbing satellite detector are analyzed in detail which including laser power density on the surface of the detector after long distance transmission and laser power density threshold for disturbing etc. These factors are not only induced by the satellite orbit but dependence on the following parameters: laser average power in the ground laser beam quality tracing and aiming precision and atmospheric transmission. A calculation model is developed by considering all factors which then the power density entering into the detector can be calculated. Secondly the laser disturbing experiment is performed by using LD (laser diode) with the wavelength 808 nm disturbing CCD 5 kilometer away which the disturbing threshold value is obtained as 3.5510-4mW/cm2 that coincides with other researcher's results. Finally using the theoretical model the energy density of laser on the photosensitive surface of MSTI-3 satellite detector is estimated as about 100mW/cm2 which is largely exceed the disturbing threshold and therefore verify the feasibility of using this kind of laser disturbing the satellite-based detector. According to the results. using the similar laser power density absolutely saturate the requirements to laser disturbing satellite-based detector. If considering the peak power of pulsed laser even decrease laser average power it is also possible to damage the detector. This result will provide the reliable evidences to evaluate the effect of laser disturbing satellite-based detector. 2009 SPIE.
	Crystal structure and mutagenic analysis of GDOsp, a gentisate 1,2-dioxygenase from Silicibacter Pomeroyi 期刊论文 OAI收割 PROTEIN SCIENCE, 2008, 卷号: 17, 期号: 8, 页码: 1362-1373 Chen, Jia; Li, Wei; Wang, Mingzhu; Zhu, Guangyu; Liu, Dongqi; Sun, Fei; 孙飞; Hao, Ning; Li, Xuemei; 李雪梅; Rao, Zihe; 饶子和; Zhang, Xuejun C 收藏 \| 浏览/下载：23/0 \| 提交时间：2013/12/25 gentisate 1 2-dioxygenase extradiol dioxygenase mononuclear metal center bicupin folding long-distance communication
	自由空间激光远距离传输的地面模拟研究期刊论文 OAI收割中国激光, 2005, 卷号: 32, 期号: 10, 页码: 1367, 1370 万玲玉; 刘立人; 张明丽收藏 \| 浏览/下载：1666/192 \| 提交时间：2009/09/18 光通信 optics communication 星间激光通信 intersatellite laser communication 远距离传输模拟 long-distance propagation simulation 光学傅里叶变换 optical Fourier-transform 级联放大 cascade imaging amplification