中国科学院机构知识库网格系统: 检索

Mosaic environment-driven evolution of the deep-sea mussel Gigantidas platifrons bacterial endosymbiont 期刊论文 OAI收割
MICROBIOME, 2023, 卷号: 11, 期号: 1, 页码: 19
作者: Sun, Yan; Wang, Minxiao; Cao, Lei; Seim, Inge; Zhou, Li

|

收藏 | 浏览/下载：36/0 | 提交时间：2024/04/07

Deep sea Horizontally transmitted endosymbionts Within-species diversity Mobile genetic elements Genome evolution Environmental adaptation

Specificity and seasonal prevalence of anther smut disease Microbotryum on sympatric Himalayan Silene species 期刊论文 OAI收割
JOURNAL OF EVOLUTIONARY BIOLOGY, 2019, 卷号: 32, 期号: 5, 页码: 451-462
作者: Tang, Hui; Hood, Michael E.; Ren, Zong-Xin; Li, Hai-Dong; Zhao, Yan-Hui

|

收藏 | 浏览/下载：79/0 | 提交时间：2019/09/10

anther smut fungus disease prevalence flowering phenology host specificity pollinator-transmitted pathogen Silene-Microbotryum interaction sympatry

Incoherent space beam combining of fiber-transmitted semiconductor lasers for oil well laser perforation 期刊论文 OAI收割
IEEE Access, 2019, 卷号: 7, 页码: 154457-154465
作者: Bai, Yang; Lei, Guangzhi; Chen, Haowei; Feng, Xiaoqiang; Li, Diao

|

收藏 | 浏览/下载：56/0 | 提交时间：2020/03/02

Fiber-transmitted incoherent space beam combining laser perforation overlapping ef ciency 10 kW

Dynamics of slow electrons transmitting through straight glass capillary and tapered glass capillary 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2016, 卷号: 65, 页码: 8
作者: Schuch, Reinhold; Cui Ying; Shao Jian-Xiong; Yang Zhi-Hu; Chen Xi-Meng

|

收藏 | 浏览/下载：76/0 | 提交时间：2018/05/31

low energy electron the full angular distribution of the transmitted electrons glass capillaries highly charged ions

Numerical investigation of the starting process in a long-test-duration hypersonic shock tunnel 会议论文 OAI收割
22nd AIAA Computational Fluid Dynamics Conference, 2015, Dallas, TX, United states, June 22, 2015 - June 26, 2015
作者: Wang YP(汪运鹏); Hu ZM(胡宗民); Liu YF(刘云峰); Jiang ZL(姜宗林)

收藏 | 浏览/下载：27/0 | 提交时间：2017/05/05

Inviscid flows Numerical investigations Outlet diameters Reflected shock waves Simulated results Starting process Transmitted shock Unsteady nozzle flow

Image coding using wavelet-based compressive sampling (EI CONFERENCE) 会议论文 OAI收割
2012 5th International Symposium on Computational Intelligence and Design, ISCID 2012, October 28, 2012 - October 29, 2012, Hangzhou, China
作者: Li J.; Li J.; Li J.

收藏 | 浏览/下载：45/0 | 提交时间：2013/03/25

In this paper we proposed a novel coding scheme is proposed using wavelet-based CS framework for nature image. First two-dimension discrete wavelet transform (DWT) is applied to a nature image for sparse representation. After multi-scale DWT the low-frequency sub-band and high-frequency sub-bands are re-sampled separately. According to the statistical dependences among DWT coefficients we allocate different measurements to low- and high-frequency component. Then the measurements samples can be quantized. The quantize samples are entropy coded and forward correct coding (FEC). Finally the compressed streams are transmitted. At the decoder one can simply reconstruct the image via l1 minimization. Experimental results show that the proposed wavelet-based CS scheme achieves better compression performance against the relevant existing solutions.

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：35/0 | 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.

Design of transmission of high-speed CCD driving signals (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
作者: Zhang S.

收藏 | 浏览/下载：71/0 | 提交时间：2013/03/25

In order to overcome the distortion problem of CCD driving signals caused by signal transmission the detail implementation of transmission of high-speed CCD driving signals based on transmission line theory is discussed. The CCD driving signals are critical to the CCD to produce high quality images. In high speed application these drivers will occupy more circuit board areas and can not be put very close to the CCD. So the driving signals must be transmitted. Because the CCD exhibits capacitive load the driving signals distortion problem is much severe. Transmission line theory is used to analyze the problem. The method of source termination is adopted to avoid signal reflections. Meanwhile the characteristic impedance of the circuit board and the resistance of terminal resistor are designed small enough to decrease the rising and falling time of the driving signals. Experimental results show that there is no distortion of the high speed driving signals after transmission. 2011 IEEE.

Dynamic closed-loop test for real-time drift angle adjustment of space camera on the Earth (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Xu S.; Wang D.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

In order to eliminate the influence of aircraft attitude angle to the image quality of space camera and assure that the drift angle of space camera could be accurately adjusted at the orbit a novel closed-loop test method is provided for real-time drift angle adjustment of space camera on the Earth. A long focal length dynamic aim generator is applied to simulate the image motion and the variety drift angle and to detect the precision of the image motion compensation machinery and the capability of the drift angle control system. The computer system is used to control the dynamic aim generator accomplish the data processing transmit and receive the data information. The seamless connection and the data transmission between the aim generator and the aircraft simulation devices are constituted. The command parameter and drift angle data transmitted by the simulation devices are received by the space camera at the real time then the photos are taken and the draft angle is adjusted simultaneously. It is shown that the drift angle can be accurately tracked by the space camera at the real time and the detective method satisfies the test requirement. 2010 Copyright SPIE - The International Society for Optical Engineering.

Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China
作者: Zhao S.; Tian Y.-Z.; Liu L.-S.; Guo J.; Zhang H.-Y.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

In order to lead the laser beam transmit in the atmosphere convergently an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly the laser was collimated by a beam expander then the near-parallel laser beam was transmitted with a Galileo telescope system and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform so the focus of the system changed due to the tiny displacement of the concave lens. Secondly the average power of the laser spot can be measured using power meter the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm it is 10.43% of the total diameter of the laser spot. At last the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit attenuation in the atmosphere geometrical aberration of optical system and the diffraction limit and the geometrical aberration are significant in the three factors above so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.