检索结果-南通市图书馆

Progress in Natural Science:Materials International 2007年第8期17卷 913-918页

作者： Xu Jin~1 Hu Guangshu~(1**) Huang Houbin~2 (1.department of Biomedical Engineering,Tsinghua university,beijing 100084,china 2.department of Ophthalmology,General Hospital of Chinese PLA,beijing 100853,china) [a]department of Biomedical Engineering Tsinghua University Beijing China [b]department of Ophthalmology General Hospital of Chinese PLA Beijing China

The multifocal electroretinogram (mfERG) is a newly developed electrophysiological *** this paper,a classifi- cation method is proposed for early diagnosis of the diabetic retinopathy using mfERG *** records were obtained from eyes of healthy individuals and patients with diabetes at different *** each mfERG record,103 local responses were *** value of each point on all the mfERG local responses was looked as one potential feature to classify the experimental *** sub- sets were selected from the feature space by comparing the inter-intra *** on the selected feature subset,Fisher's linear classi- fiers were *** the final classification decision of the record was made by voting all the classifiers' *** the method to classify all experimental subjects,very low error rates were *** crucial properties of the diabetic retinopathy classification method are also discussed.

关键词： diabetic retinopathy multifocal electroretinogram feature selection linear classifier

Multiparty quantum secret sharing of classical and quantum messages

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第1期17卷 26-31页

作者： CHEN Pan, DENG Fuguo and LONG Guilu ( Key Laboratory for Quantum Information and Measurements, and department of Physics, Tsinghua university, beijing 100084, china Key Laboratory of Beam Technology and Material Modification, MOE, Institute of Low Energy Nuclear Physics, and department of Material Science and Engineering, beijing normal university, beijing 100875, china beijing Radiation Center, beijing 100875, china Key Laboratory for Atomic and Molecular Nano-Sciences, Tsinghua university, beijing 100084, china) [a]Key Laboratory for Quantum Information and Measurements and Department of Physics Tsinghua University Beijing China [b]Key Laboratory of Beam Technology and Material Modification MOE Institute of Low Energy Nuclear Physics and Department of Material Science and Engineering Beijing Normal University Beijing China [c]beijing Radiation Center Beijing China [d]Key Laboratory for Atomic and Molecular Nano-Sciences Tsinghua University Beijing China

A scheme for multiparty quantum secret sharing of classical and quantum messages is proposed by using entanglement swapping. This scheme can distribute not only the classical information but also the quantum informati... 详细信息

关键词： quantum secret sharing classical message quantum message EPR pair.

A Comment the BooK“continuous-Time Markov Chains” by ***

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

应用概率统计 1996年第1期 55-59页

作者： MUFA CHEN (beijing normal university, beijing, 100875)

The book "Continuous-Time Markov Chains" by W. J. Anderson collects a large part of the development in the past thirty years. It is now a popular reference for the researchers on this subject or related fields. Unfortunately, due to a misunderstanding of the approximating methods, several results in the book are incorrectly stated or proved. Since the results are related to the present author’s work, to whom it may be a duty to correct the mistakes in order to avoid further confusion. We emphasize the approximating methods because they are useful in many situations.

关键词： Q-propess approximation method stochastically comparability.

Quick image-processing method of UAV without control points data in earthquake disaster area

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 523-528页

作者： LI Chang-chun1, ZHANG Guang-sheng1, LEI Tian-jie2, 3, GONG A-du2, 3 1. School of Surveying & Land Information Engineering, Henan Polytechnic university, Jiaozuo 454000, china 2. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, beijing normal university, beijing 100875, china 3. Ministry of Civil Affairs/Ministry of Education of china Academy of Disaster Reduction and Emergency Management, beijing normal university, beijing 100875, china [a] School of Surveying & Land Information Engineering Henan Polytechnic University Jiaozuo 454000 China [b] Key Laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University Beijing 100875 China [c] Ministry of Civil Affairs/Ministry of Education of china Academy of Disaster Reduction and Emergency Management Beijing Normal University Beijing 100875 China

The methods of unmanned aerial vehicles images splicing rapidly and rectifying without control points data, only using auxiliary data recorded by unmanned aerial vehicle (UAV) system, were researched. Two algorithms were proposed, including UAV images auto- splicing rapidly after image blocking and UAV images rectifying based on pseudo center points of auxiliary data. When SIFT algorithm for UAV images splicing is applied, the accuracy is very high, but the efficiency is very low. The splicing efficiency is improved greatly based on SIFT algorithm after image blocking. The results show that rectifying accuracy is very high and has no visual dislocation when pseudo center points of auxiliary data is applied.

关键词： unmanned aerial vehicles SIFT algorithm blocking quickly splicing rectification

Strongly Singular Convo1ution Operators on the Weighted Herz-Type Hardy Spaces

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1998年第1期14卷 67-76页

作者： Li Xiaochun Lu Shanzhen department of Mathematics, beijing normal university, beijing 100875, china

Let 01, w2 ∈A1 （Muckenhoupt-class）. In this paper the authors prove that the strongly singular convolution operators are bounded from the homogeneous weighted Herz-type Hardy spaces HKqα,p（w1; w2） to the homogeneous weighted Herz spaces Kqα,p（w1;w2）, provided α=n（1--1/q）. Moreover, the boundedness of these operators on the non-homogeneous weighted Herz-type Hardy spaces HKqα,p（w1, w2） is also investigated.

关键词： Strongly singular convolution operator Hardy space

Characteristics of energy dissipation in hyperconcentrated flows

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2008年第4期23卷 387-397页

作者： An-ping SHU 1,Qing-quan LIU2,Yu-jun YI 3,and Zhi-dong ZHANG 41 Assoc.Prof.,School of Environment,Key Laboratory of Water and Sediment Sciences of Ministry of Education,beijing normal university,beijing 100875,china2 Prof.,Institute of Mechanics,Chinese Academy of Sciences,beijing 100080,china3 Lecturer,Dr.,School of Environment,beijing normal university,beijing 100875,china4 Graduate student,School of Environment,beijing normal university,beijing 100875,china [a]Assoc. Prof. School of Environment Key Laboratory of Water and Sediment Sciences of Ministry of Education beijing normal university beijing 100875 china [b]Prof. Institute of Mechanics Chinese Academy of Sciences beijing 100080 china [c]Lecturer Dr. School of Environment beijing normal university beijing 100875 china. The project is supported by the National Natural Science Foundation of china (Grant No. 10672024) [d]Graduate student School of Environment beijing normal university beijing 100875 china

An equilibrium equation for the turbulence energy in sediment-laden flows was derived on the basis of solid–liquid two-phase flow theory. The equation was simplified for two-dimensional, uniform, steady and fully developed turbulent hyperconcentrated flows. An energy efficiency coefficient of suspended-load motion was obtained from the turbulence energy equation, which is defined as the ratio of the sediment suspension energy to the turbulence energy of the sediment-laden flows. Laboratory experiments were conducted to investigate the characteristics of energy dissipation in hyperconcentrated flows. A total of 115 experimental runs were carried out, comprising 70 runs with natural sediments and 45 runs with cinder powder. Effects of sediment concentration on sediment suspension energy and flow resistance were analyzed and the relation between the energy efficiency coefficient of suspended-load motion and sediment concentration was established on the basis of experimental data. Furthermore, the characteristics of energy dissipation in hyperconcentrated flows were identified and described. It was found that the high sediment concentration does not increase the energy dissipation; on the contrary, it decreases flow resistance.

关键词： Hyperconcentrated flows Turbulence energy Efficiency coefficient Energy dissipation

Preparation of Platinum Implanted Glassy Carbon Electrode and Electro-oxidation of Formic Acid and Formaldehyde

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2000年第1期11卷 71-74页

作者： Cun Zhong ZHANG Jing YANG Xiao Lin LU Zhong Da WU( department of Chemistry, beijing normal university, beijing 100875) beijing normal Univ Dept Chem Beijing 100875 Peoples R China

The glassy carbon substrates were bombarded with 5 X 10(17) ions/cm(2) of platinum. The surface composition of implanted electrode and concentration-depth profiles of various elements were measured by AES. The chemical state of Pt in glassy carbon electrode implanted with platinum (Pt/GC) was detected by X-ray Photoelectron Spectroscopy (XPS). The electro-oxidation of HCOOH and HCHO have been investigated on Pt/CC and smooth Pt electrodes. The results show that the platinum implanted into glassy carbon is much more active than the smooth platinum metal for electro-oxidation of HCOOH and HCHO.

关键词： ion implantation electro-oxidation formic acid formaldehyde

Investors Thinking and Stock Price Excess Volatility

在线全文

学校读者我要写书评

暂无评论

Systems Science and Systems Engineering 1999年第1期9卷 101-105页

作者： LI Honggang(department of Systems Science, beijing normal university, beijing 100875, china)

This paper presents a simplified dynamic model to explore the dynamic mechanism inexcess volatility of stock prices. We attempt to show how investors thinking work for explaining theobservable features of stock market... 详细信息

关键词： Fundamental value Excess volatility Internal dynamics of investor thinking

The Besov Space B_1^(0.1) on Domains

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2001年第2期17卷 181-196页

作者： Yi Qing GUI Shan Zhen LU Da Chun YANG department of Mathematics. beijing normal university. beijing 100875. P. R. china department of Mathematics Beijing Normal University Beijing 100875 P. R. China

Let Ω be a bounded Lipschitz domain. Define B1,r0.1（Ω）={f∈L1（Ω）: there is an F∈ B10.1（Rn） such that F|Ω=f| and B1,z0.1（Ω）={f∈B10.1（Rn）: f=0 on Rn\}. In this paper, the authors establish the atomic decompositions of these spaces. As by-products, the authors obtained the regularity on these spaces of the solutions to the Dirichlet problem and the Neumann problem of the Laplace equation on R+n.

关键词： Besov space Lipschitz domain Atom Laplace equation

Latest cosmological constraints on Cardassian expansion models including the updated gamma-ray bursts

在线全文

学校读者我要写书评

暂无评论

Research in astronomy and Astrophysics 2011年第9期11卷 1019-1030页

作者： Nan Liang Pu-Xun Wu Zong-Hong Zhu department of astronomy Beijing Normal University Beijing 100875 China Center for High Energy Physics Peking University Beijing 100871 China Center of Nonlinear Science and department of Physics Ningbo University Ningbo 315211 China

We constrain the Cardassian expansion models from the latest observa- tions, including the updated Gamma-ray bursts （GRBs）, which are calibrated using a cosmology independent method from the Union2 compilation of type Ia supernovae （SNe Ia）. By combining the GRB data with the joint observations from the Union2 SNe Ia set, along with the results from the Cosmic Microwave Background radia- tion observation from the seven-year Wilkinson Microwave Anisotropy Probe and the baryonic acoustic oscillation observation galaxy sample from the spectroscopic Sloan Digital Sky Survey Data Release. we find significant constraints on the model oarameters of the original Cardassian model ΩM0=0.282-0.014^0.015,n=0.03-0.05^＋0.05 and n=-0.16-3.26^＋0.25,β=0.76-0.58^＋0.34 of the modified polytropic Cardassian model, which are consistent with the ACDM model in a l-or confidence region. From the reconstruction of the deceleration parameter q（z） in Cardassian models, we obtain the transition redshift ZT = 0.73 ± 0.04 for the original Cardassian model and ZT = 0.68 ± 0.04 for the modified polytropic Cardassian model.

关键词： gamma-rays bursts -- cosmology cosmological parameters