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浏览/检索结果: 共27条，第1-10条 帮助

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Spatial-Temporal Pattern of Urban Land Green Use Efficiency and Its Influencing Factors in Guizhou Province, China, Based on County Units 期刊论文  OAI收割
LAND, 2024, 卷号: 13, 期号: 12, 页码: 24
作者:  Xu, Zhongchun;  Chen, Hongqin;  Song, Wei
  |  收藏  |  浏览/下载：4/0  |  提交时间：2025/03/03
Analysis and design of voltage doubling rectifier circuit for power supply of neutron source device towards BNCT 期刊论文  OAI收割
NUCLEAR ENGINEERING AND TECHNOLOGY, 2024, 卷号: 56
作者:  Wang, Rixin;  Liang, Lizhen;  Gong, Congguo;  Wang, Longyang;  Tao, Jun
  |  收藏  |  浏览/下载：6/0  |  提交时间：2024/11/20
Theoretical study of the characteristics of a continuous wave iron-doped ZnSe laser 期刊论文  OAI收割
Laser Physics, 2018, 卷号: 28, 期号: 3, 页码: 6
作者:  Pan, Q. K.;  Chen, F.;  Xie, J. J.;  Wang, C. R.;  He, Y.
  |  收藏  |  浏览/下载：18/0  |  提交时间：2019/09/17
Theoretical study on rotary-sliding disk triboelectric nanogenerators in contact and non-contact modes 期刊论文  iSwitch采集
Nano research, 2016, 卷号: 9, 期号: 4, 页码: 1057-1070
作者:  Jiang, Tao;  Chen, Xiangyu;  Yang, Keda;  Han, Changbao;  Tang, Wei
收藏  |  浏览/下载：39/0  |  提交时间：2019/05/09
Design of high speed and parallel compression system used in the big area CCD of high frame frequency (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Precision Engineering and Non-Traditional Machining, PENTM 2011, December 9, 2011 - December 11, 2011, Xi'an, China
作者:  Li G.-N.;  Jin L.-X.;  Zhang R.-F.;  Wang W.-H.;  Li G.-N.
收藏  |  浏览/下载：51/0  |  提交时间：2013/03/25
According to the area CCD camera of characteristics  such as high resolution capacity and high frame frequency  this paper puts forward a high speed and parallel image compression system of high integration degree. Firstly  according to the work principle of the area CCD  FPGA is adopted to realize the timing driving and multichannel and parallel analog signal handling to raise the export frame frequency of the area CCD. Secondly  with an image compression scheme based on FPGA embedded processor MicroBlaze and ADV212 compression chip  real time image compression and the high speed area CCD are realized. Finally  by detecting the analog signal of the area CCD output  the real time compression of the big area CCD image is carried out in different compression ratios and the compression performance is analyzed. Experiment result shows that this scheme can realize real time image compression with the biggest data rate of 520Mbps. When compression bit ratio is 0.15  the signal-to-noise ratio of peak value can reach 36 dB. Image collection and image compression are integrated  which reduces the data transmission between them and improves systematic integration degree.  
Optically induced current oscillation in a modulation-doped field-effect transistor embedded with inas quantum dots 期刊论文  iSwitch采集
Physica e-low-dimensional systems & nanostructures, 2011, 卷号: 44, 期号: 3, 页码: 686-689
作者:  Li, Y. Q.;  Wang, X. D.;  Xu, X. N.;  Liu, W.;  Yang, F. H.
收藏  |  浏览/下载：34/0  |  提交时间：2019/05/12
Design of thermostat system based on Proteus simulation software (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
Han Z.; Song K.
收藏  |  浏览/下载：38/0  |  提交时间：2013/03/25
In order to solve the problem of precise temperature control  the thermoelectric cooler (TEC) principle widely used is analyzed for the design of the whole control process and selection of control parameters  and then accurate simulation model of the TEC is established in Proteus simulation software. Moreover  combined with the traditional circuit simulation model  the temperature control loop is designed  and the response characteristics of the system are tested using an input signal similar to the unit-step function to achieve the precise temperature control. Simulation results show that the proposed control circuits can precisely convert error signal to output voltage sent to TEC model  and TEC model behaves approximately like a two-pole system. The first pole starts at 20mHz and a second pole at 1Hz. 2011 IEEE.  
Design of multispectral remote sensing image compression system (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
作者:  Xu S.-Y.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
In order to get the higher compression quality of multispectral remote sensing image  which taken the JPEG2000 as the standard  used FPGA and special compression chip ADV212 to realize the remote sensing image compression system is proposed. The system used the specialty compression chip ADV212 which is newly relaesed by Analog Device company. It used to develop fast high-quality compression for the large amount of remote sensing image data. The system realized the image data's input  the compression stream's output  the image preprocessing as well as to control the ADV212 chip's working pattern through FPGA. The experiment result shows that this system which has such characteristics as low power consumption. low cost and easy adjustmen and has a good compressing effect. Meet the requirement of the multispectral remote sensing image's high compression ratio. 2010 IEEE.  
Noise processing technology of a TDICCD sensor (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者:  Zhang L.-P.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
In the application of TDI-CCD  the other is all kinds of interference noise produced in the working process of a TDI-CCD  for reset noise  because of its serious noise interference  such as reset noise and 1 / f noise  correlated double sampling is employed. The experimental results show that after noise processing  the imaging quality is reduced  etc. According to the features of noise  the output S/N has been raised to about 50 dB. 2010 IEEE.  so that it is necessary to study the noise characteristics of TDI-CCD. There are two categories of noise  this paper has studied the corresponding noise-processing technology. For dark current noise  one is the inherent noise  refrigeration is taken  including shot noise  dark current noise  fixed pattern noise and transfer noise etc.  
Application of precision harmonic gear drive in focusing mechanism of space camera (EI CONFERENCE) 会议论文  OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, April 26, 2010 - April 29, 2010, Dalian, China
作者:  Zhang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25
A kind of precision harmonic gear drive in the focusing mechanism of space camera is studied  which adopt external meshing complex wave transmission mode. Wave generator is combined with an elliptic cam and a flexible bearing around it. Flexspline is a structure of single wave with the same teeth. The output shaft is supported by a single cross-roller bearing. Ball screws connected the output shaft translate the rotational motion to the linear motion  and drive the focusing mirror repeated moving along the linear guide. The output rigid wheel is connected with absolute encoder to detect displacement of focusing movement. It has the characteristics of big transmission ratio  high precision  compact structure  high efficiency and smooth running etc. According to the practical application of this harmonic gear drive in the space camera  the location relationship between the displacement of focusing structure and the focal plane movement is derived  and the system error is analyzed  its accuracy is tested with the open-loop control method. Experimental results show that transmission ratio of the instrument is 1:70  repeated positional accuracy is 2m  which meet the requirements for use. 2010 SPIE.