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浏览/检索结果: 共10条，第1-10条 帮助

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Can CINRAD Radar With VCP-21 Mode Capture the Accumulated Rainfall Pattern and Intensity of Fast-Moving Storms? 期刊论文  OAI收割
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2024, 卷号: 62, 页码: 13
作者:  Yang, Zhida;  Qi, Youcun;  Zhang, Zhe;  Li, Donghuan
  |  收藏  |  浏览/下载：36/0  |  提交时间：2024/04/01
Ethnobotanical survey of plant species for herbal tea in a Yao autonomous county (Jianghua, China): results of a 2-year study of traditional medicinal markets on the Dragon Boat Festival 期刊论文  OAI收割
JOURNAL OF ETHNOBIOLOGY AND ETHNOMEDICINE, 2018, 卷号: 14, 页码: 21
作者:  Jin, Bing;  Liu, Yujing;  Xie, Jiaxi;  Luo, Binsheng;  Long, Chunlin
  |  收藏  |  浏览/下载：57/0  |  提交时间：2018/10/22
Tetrahymena-specific biomass evaluation with a DNA-based method 期刊论文  OAI收割
SCIENCEASIA, 2013, 卷号: 39, 期号: 1, 页码: 36-41
作者:  Yan, Qingyun;  Yu, Yuhe;  Dai, Lili
收藏  |  浏览/下载：18/0  |  提交时间：2014/01/03
Contrast research on interpolation and subpixel imaging in CCD geometric superresolution reconstruction (EI CONFERENCE) 会议论文  OAI收割
1st Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics, PrimeAsia 2009, November 19, 2009 - November 21, 2009, Shanghai, China
作者:  Xu Y.-S.;  Yang S.-W.
收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25
In order to enhance the resolution of Charge Coupled Device (CCD) pixel with the pixel dimension and focal length of optical system unchanged  the problem of CCD geometric superresolution is educed. The problem is discussed in terms of software and hardware. In software  the bicubic interpolation is introduced  while in hardware  the subpixel imaging method is utilized. The subpixel imaging method integrates two uniform linear CCDs staggered by half dimension of pixel in one device. In operation  the line frequency is doubled. At last  the collected data is interweaved to synthesize a high resolution image. The two methods  bicubic interpolation and subpixel imaging  are simulated with Matlab7.0.1. The qualitative and quantitative analyses are given. The simulated results of lanczos and cubic spline interpolation methods are given simultaneously to show the performance of interpolation. The simulation result shows that the result images quality becomes better in both methods  but compared with bicubic interpolation method  the synthesized image PSNR gained from sub-pixel imaging is averagely enhanced by 2.1682dB  while the elapsed time is reduced to be about one forth. The subpixel imaging method could significantly mitigate the image blur introduced by undersample. 2009 IEEE.  
Assessment of surface roughness by use of soft x-ray scattering (EI CONFERENCE) 会议论文  OAI收割
Soft X-Ray Lasers and Applications VIII, August 4, 2009 - August 6, 2009, San Diego, CA, United states
Yan-li M.; Yong-gang W.; Shu-yan C.; Bo C.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25
A soft x-ray reflectometer with laser produced plasma source has been designed  which can work from wavelength 8nm to 30 nm and has high performance. Using the soft x-ray reflectometer above  the scattering light distribution of silicon and zerodur mirrors which have super-smooth surfaces could be measured at different incidence angle and different wavelength. The measurement when the incidence angle is 2 degree and the wavelength is 1 lnm has been given in this paper. A surface scattering theory of soft x-ray grazing incidence optics based on linear system theory and an inverse scattering mathematical model is introduced. The vector scattering theory of soft x-ray scattering also is stated in detail. The scattering data are analyzed by both the methods above respectively to give information about the surface profiles. On the other hand  both the two samples are measured by WYKO surface profiler  and the surface roughness of the silicon and zerodur mirror is 1.3 nm and 1.5nm respectively. The calculated results are in quantitative agreement with those measured by WYKO surface profiler  which indicates that soft x-ray scattering is a very useful tool for the evaluation of highly polished surfaces. But there still some difference among the results of different theory and WYKO  and the possible reasons of such difference have been discussed in detail. 2009 SPIE.  
The quantitative evaluation on X3D-based ORGDM 会议论文  OAI收割
2009 WRI World Congress on Computer Science and Information Engineering, CSIE, Los Angeles, CA, United states, 2009
Chen; Yan-Rui1; 2; 3; Wang; Tao1; Xi1; Bai; Xu4
收藏  |  浏览/下载：26/0  |  提交时间：2011/08/23
Mid-frequency surface error test with a Foucault apparatus (EI CONFERENCE) 会议论文  OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, July 8, 2007 - July 12, 2007, Chengdu, China
作者:  Li J.;  Li J.;  Xuan B.;  Li J.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Testing of mid-frequency surface error is of the first importance for fast optics  especially for large aperture aspherics. Foucault test plays a dominant role for surface error inspection before the digital interferometer age  but it seems to have faded out these days because no quantitative results turn out. However  an interferometer with high resolution CCDs is either unavailable or unaccessible in the process of manufacture. As its advantages are realized and recognized for the second time  Foucault test is going back to the stage again. A new theory of calculating the contrast of the shadow pattern of Foucault test is put forward in this paper and some modifications are discussed upon the analyses of the limitation of traditional Foucault apparatus. A paraboloidal mirror was fabricated and tested by the modified Foucault apparatus whose effect has been proved to be great. The methods of controlling mid-frequency error are described in the other paper at this conference- "Multi-mode combine manufacturing technology for large aperture aspheric mirrors"1.  
Development of a new diffuse near infrared food measuring (EI CONFERENCE) 会议论文  OAI收割
Sitxh International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, October 13, 2006 - October 15, 2006, Beijing, China
作者:  Zhang J.;  Zhang J.;  Zhang J.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25
Industries from agriculture to petrochemistry have found near infrared (NIR) spectroscopic analysis useful for quality control and quantitative analysis of materials and products. The general chemical  polymer chemistry  petrochemistry  agriculture  food and textile industries are currently using NIR spectroscopic methods for analysis. In this study  we developed a new sort NIR instrument for food measuring. The instrument consists of a light source  12 filters to the prismatic part. The special part is that we use a mirror to get two beams of light. And two PbS detectors were used. One detector collected the radiation of one light beam directly and the value was set as the standard instead the standard white surface. Another light beam irradiate the sample surface  and the diffuse light was collected by another detector. The value of the two detectors was compared and the absorbency was computed. We tested the performance of the NIR instrument in determining the protein and fat content of milk powder. The calibration showed the accuracy of the instrument in practice.  
Comparing the soil quality changes of different land uses determined by two quantitative methods 期刊论文  OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA, 2003, 卷号: 15, 期号: 2, 页码: 167-172
作者:  Fu, BJ;  Liu, SL;  Lu, YH;  Chen, LD;  Ma, KM
收藏  |  浏览/下载：27/0  |  提交时间：2015/11/10
Comparing the soil quality changes of different land uses determined by two quantitative methods 会议论文  OAI收割
2nd International Conference on Landscape Ecology of Asia and Pacific Region, LANZHOU, PEOPLES R CHINA, SEP 22-25, 2001
作者:  Fu, BJ;  Liu, SL;  Lu, YH;  Chen, LD;  Ma, KM
收藏  |  浏览/下载：18/0  |  提交时间：2016/01/14