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Pore-scale study of dissolution-induced changes in permeability and porosity of porous media 期刊论文
JOURNAL OF HYDROLOGY, 2014, 卷号: 517, 期号: [db:dc_citation_issue], 页码: 1049-1055
作者:  Kang, Qinjun;  Chen, Li;  Valocchi, Albert J.;  Viswanathan, Hari S.
收藏  |  浏览/下载：5/0  |  提交时间：2019/12/03
清代科举与经学关系研究 学位论文
2012, 2012
冯建民
收藏  |  浏览/下载：3/0  |  提交时间：2016/02/14
Research on energy characteristics of aerospace relay mirror system (EI CONFERENCE) 会议论文
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
Liu C.; Zhong X.; Piao Y.; Jin G.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
Aerospace Relay Mirror System (ARMS) as a new concept weapon used in reflection of High Energy Laser (HEL) in space is studied. It extends the attacking range of Ground Based Laser (GBL) weapons enormously. Relevant researches have been carried out for many years. The structures and operating theory of the entire system consists of ground-based high energy laser weapon and space-based relay mirror. The main work of this study is focused on the analysis of relay mirror energy characteristics to deduce the relationship among the attacking range of weapon and diameter of ARMS and target irradiance. Calculation examples are also given. The results proved the strong points and feasibility of ARMS theoretically further. It is summarized that more importance should be attached to ARMS development. The results given in this paper can be reference of an actual ARMS system to some extends. 2011 IEEE.  
Design and demonstration of micro multi-step mirrors and light source in micro FTIR (EI CONFERENCE) 会议论文
6th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2011, February 20, 2011 - February 23, 2011, Kaohsiung, Taiwan
Liang Z.; Fu J.; Feng C.; Liang J.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25
To obtain high resolution  high signal-to-noise ratio (SNR)  high reliability and real time in wide spectral range  we study the space modulation Micro Fourier Transform Spectrometer (FTS) based on multi-step mirrors covering the spectral range of 3-5m and 8-12 m in theory and experiment. The influences of spectrum reconstruction caused by the diffraction and extended light source in Fourier Transform Infrared Spectrometer (FTIR) are analyzed. A method to reduce the noises in spectrum reconstruction and the relationship between coherent intensity and solid angle of light source are discussed. An extended light source with suitable size is chosen  considering the requirement of SNR and spectrum resolving power in the optical design. Furthermore  the fabrication of micro multi-step mirrors  which is the core part of FTS  is investigated. Three methods for fabricating multi-step micro mirrors are demonstrated. 2011 IEEE.  
Ownership concentration, ownership control and enterprise performance: Based on the perspective of enterprise life cycle 期刊论文
AFRICAN JOURNAL OF BUSINESS MANAGEMENT, 2010, 卷号: 4, 期号: 11, 页码: 2309-2322
作者:  Cao, Yu*
收藏  |  浏览/下载：5/0  |  提交时间：2019/12/03
This study examines the relationship between ownership structure and enterprise performance from the perspective of enterprise life cycle  by adding the variables of the enterprise life cycle stages into the model  to explain the inconsistence with the previous study results on this issue. Using a unique 2002 - 2007 panel data of the listed Chinese companies  this study finds that ownership concentration has a significant positive impact on enterprise performance both at the growth stage and decline stage  but not prominent at the mature stage. Ownership control has a significant negative impact which is gradually weakening on enterprise performance at the growth stage  and it has a significant positive impact on enterprise performance at the mature stage  but not prominent at the decline stage. There are no prominent curve relations between ownership concentration  ownership control and enterprise performance.  
Drug discovery based on classic natural products 期刊论文
Acta Pharmaceutica Sinica, 2009, 卷号: 44, 期号: 1, 页码: 11-18
作者:  
收藏  |  浏览/下载：20/0  |  提交时间：2019/01/08
Remote chlorophyll-a retrieval in eutrophic inland waters by concentration classification Taihu Lake case study 会议论文
International Conference on Earth Observation Data Processing and Analysis, ICEODPA,, Wuhan, China, December 28, 2008 - December 30,2008
Du, Cong; Wang, Shixin; Zhou, Yi; Yan, Fuli
收藏  |  浏览/下载：18/0  |  提交时间：2014/12/07
In order to improve the precision of phytoplankton chlorophyll-a (chla) concentration retrieval  this study classified the data into two groups (the high and the low) by chla concentration with the threshold of 50gA&bullL-1. And then build the statistical models for each group. Particularly  a modifying factor OSS/TSS was used to unmixing the spectra in the low model to improve the low relationship between spectral reflectance and chla concentrations. As a result  the concentration classification model allowed estimation of chla with a root mean square error (RMSE) of 21.12gA&bullL-1 and the determination coefficient (R2) was 0.92  comparing with RMSE of chla estimation was 35.72gA&bullL-1 and R2=0.72 in the traditional model. It shows that concentration classification is a helpful method for accurate remote chla retrieval in eutrophic inland waters. 2008 SPIE.  
Study of high precision non-contact measurement based on CCD (EI CONFERENCE) 会议论文
4th International Conference on Information Technology and Applications, ICITA 2007, January 15, 2007 - January 18, 2007, Harbin, China
Lin L.; Yun F.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
In this paper a method that measures relatively positionrelationshipquickly and accurately between two vehicles both on a horizontal plane is introduced. When the linear CCD camera placed on the end of manipulator scans two point targets located on the other vehicle  by virtue of the spatial intersection principle and trigonometry theorem  the relative position relationship between the loading vehicles and launching ones can be gotten(i.e. the spatial coordinate parameters of x  y  z and the angle displacement ). At the same time the paper establishes that the measurement error of length is less than 1mm  by analysis of thee rror analysis and the simulation of computer. The angle displacement is less than 3  which satisfies the technical requests. So the vehicle orientation and loading missiles can be both done at the shortest time. It meets the demand of centralization between the measurement and execution. Forboth automatic transshipment and spatial position relationship measurement  the study is valuable. And the manipulator is measure device as well as executive one so that residual inherent error decreases according to identical reference principle. Therefore the measure precision can be improved greatly.  
“依附式”合作与双重推动：中国慈善组织与政府、企业的关系研究 学位论文
2007, 2007
苏永华
收藏  |  浏览/下载：2/0  |  提交时间：2016/02/14
CR image filter methods research based on wavelet-domain hidden markov models (EI CONFERENCE) 会议论文
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
Wang J.-L.; Wang Y.-P.; Li D.-Y.; Li S.-W.; Kui H.-L.
收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25
In the procedure of computed radiography imaging  we should firstly get across the characters of kinds of noises and the relationship between the image signals and noises. Based on the specialties of computed radiography (CR) images and medical image processing  we have study the filtering methods for computed radiography images noises. On the base of analyzing computed radiography imaging system in detail  the author think that the major two noises are Gaussian white noise and Poisson noise. Then  the different relationship of between two kinds of noises and signal were studied completely. By considering both the characteristics of computed radiography images and the statistical features of wavelet transformed images  a multiscale image filtering algorithm  which based on two-state hidden markov model (HMM) and mixture Gaussian statistical model  has been used to decrease the Gaussian white noise in computed images. By using EM (Expectation Maximization) algorithm to estimate noise coefficients in each scale and obtain power spectrum matrix  then this carried through the syncretized two Filter that are IIR(infinite impulse response) Wiener Filter and HMM  according to scale size  and achieve the experiments as well as the comparison with other denoising methods were presented at last.  

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