检索结果-南通市图书馆

The mathematical model of wetting angle of heterogeneous nucleation

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2004年第4期47卷 391-397页

作者： HUANG Cheng1, SONG Bo1, MAO Jinghong2 & ZHAO Pei3.1. school of Metallurgical and Ecological Engineering, university of Science and Technology beijing, beijing 100083. china 2. school of Material Science, university of Science and Technology beijing, beijing 100083. china 3. Central Iron and Steel Research Institute, beijing 100081, china school of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing China school of Material Science University of Science and Technology Beijing Beijing China Central Iron and Steel Research Institute Beijing China

The heterogeneous nucleation has been analyzed in terms of the thermodynamic theory, and the mathematical model of wetting angle of heterogeneous nucleation has been developed based on the dynamic requirements of hetero- and homogeneous nucleation. With the wetting angel model, the wetting angles of different catalysts in liquid iron have been calculated. The result shows that the wetting angle of most catalysts is smaller than 40, and the value of f() is far less than 1. The wetting angles of TiN, TiC and RE2O3.are smaller, while the wetting angle of MnO is bigger among the ordinary nucleation catalysts. The wetting angles calculated by this model are in agreement with the results of other research work.

关键词： heterogeneous nucleation, mathematical model, wetting angle, undercooling.

C^(18)O Observations of the Dark Molecular Cloud L13. and Gas Depletion onto Dust

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2005年第2期5卷 144-150页

作者： Xin-Jie Mao and Xiao-Xia Sun Department of Astronomy, beijing normal university, beijing 100875 maoxj@*** Department of Astronomy Beijing Normal University Beijing 100875

We map the dark molecular cloud core of L13. in the C^(18)O (J = 1 - 0)emission line using the PMO 13.7m telescope, and present a contour map of integrated intensity ofC^(18)O (J = 1 - 0) emission. The C^(18)O cloud is inside the distribution of extinction A_B, thevisual extinction of blue light, as well as inside the ^(13.CO cloud in the L13. region. Thedepletion factors in this C^(18)O cloud are generally greater than unity, which means there is gasdepletion onto dust. Since only a minimum A_B - 9.7 mag is available, and our observations measureboth undepleted and depleted regions along the line of sight, the depletion factors could verylikely be larger in the central core than the calculated value. So we conclude that depletion doesoccur in the bulk of the C^(18)O cloud through a comparison between the C^(18)O and blue extinctionmaps in the L13. region. There is no direct evidence as yet for star formation in L13., and so coreson the verge of collapse will not be visible in CO and other gas molecules.

关键词： ISM: clouds ISM: individual (L13.) ISM: molecules ISM: extinction

The Electrochemical Behavior of Bleomycin at A Co/GC Ion Implantation Modified Electrode

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1999年第10期10卷 855-856页

作者： Jing Bo HU Qi Long LI (Department of Chemistry, beijing normal university, beijing 100875) Department of Chemistry Beijing Normal University Beijing 100875 China

In 0.10 mol/L HOAc-NaOAc buffer solution (pH 4.59). a sensitive reduction peak of bleomycin is obtained by linear sweep voltammetry at Co/GC ion implantation modified electrode. Its electrochemical behavior has been studied. The experiments of AES and XPS show that Co is surely implanted into the surface of GCE and improved the electrocatalytic activity.

关键词： ion implantation electrochemical behavior bleomycin

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

在线全文

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.

Constraints on Cardassian universe from Gamma ray bursts

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1720-1725页

作者： WANG TaiShan1 & LIANG Nan2 1 Department of Physics & Center for Astrophysics,Tsinghua university,beijing 100084,china 2 Department of Astronomy,beijing normal university,beijing 100875,china Department of Physics & Center for Astrophysics Tsinghua University Beijing China Department of Astronomy Beijing Normal University Beijing China

Constraints on the original Cardassian model and the modified polytropic Cardassian model are examined from the recently derived 42 gamma-ray bursts(GRBs) data calibrated with the method that can avoid the circularity *** results show that GRBs can be an optional observation to constrain the Cardassian *** the GRBs data with the newly de-rived size of baryonic acoustic oscillation peak from the Sloan Digital Sky Survey(SDSS),and the position of the first acoustic peak of the Cosmic Microwave Background radiation(CMB) from Wilkinson Microwave Anisotropy Probe(WMAP),we find Ωm0=0.27+0.02-0.02,n=0.06+0.07-0.08(1σ) for the original Cardassian model,and Ωm0=0.27+0.23.0.02,n=-0.09+0.23.1.91,β=0.82+2.10-0.62(1σ) for the modified polytropic Cardassian model.

关键词： Cardassian Gamma ray burst Cosmic Microwave Background baryonic acoustic oscillation

Application of annexation principle to the study of thermodynamic properties of Ag-Bi-In metallic melts

在线全文

学校读者我要写书评

暂无评论

Journal of university of Science and Technology beijing 2003年第1期10卷 18-20页

作者： Jian ZhangMetallurgy school, university of Science and Technology beijing, beijing 100083. china Metall. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Based on the measured activities, the phase diagrams and the annexation principle, the calculating models of mass action concentrations for Ag-Bi and Ag-Bi-In melts have been formulated. The calculated results agree with practice and obey the mass action law, showing that the models formulated can reflect the structural characteristics of both melts. Meanwhile, it confirms that annexation principle is applicable to the Ag-Bi-In metallic melts. The melts involving eulectic which give rise to phase separation, and in which activities exhibit positive deviation from Raoult's law is the basic cause of melts transforming from homogeneous to heterogeneous ones.

关键词： the mass action law annexation principle two phase melts activity, mass action concentration

Application of the annexation principle to the study of thermodynamic properties of ternary metallic melts In-Pb-Ag and In-Bi-Sb

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第2期21卷 142-151页

作者： ZHANG JianMetallurgical Engineering school.university of Science and Technology beijing, beijing 100083. china Metallurgical Engineering school University of Science and Technology Beijing 北京 100083

Based on the phase diagrams, measured activities an the annexationprinciple, the calculating models of mass action concentrations forin-Pb-Ag and In-Bi-Sb ternary metallic melts have been *** results of calculation both agree with practice, and obey the lawof mass action, showing that the models formulated can reflect thestructural reality of the corresponding melts and the annexationprinciple is applicable to the them.

关键词： activity mass action concnetration th annexation principle In-PB-Ag

Complete multiple round quantum dense coding with quantum logical network

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第9期52卷 1162-1165页

作者： LI ChunYan1,2,LI XiHan1,2,DENG FuGuo1,2,3.ZHOU Ping1,2 & ZHOU HongYu1,2,3.1 Key Laboratory of Beam Technology and Material Modification of Ministry of Education,beijing normal university,beijing 100875,china 2 Institute of Low Energy Nuclear Physics,and Department of Material Science and Engineering,beijing normal university,beijing 100875,china 3.beijing Radiation Center,beijing 100875,china Key Laboratory of Beam Technology and Material Modification of Ministry of Education Beijing Normal University Beijing China Institute of Low Energy Nuclear Physics and Department of Material Science and Engineering Beijing Normal University Beijing China beijing Radiation Center Beijing China

We present a complete multiple round quantum dense coding scheme for improving the source ca-pacity of that introduced recently by Zhang et al. The receiver resorts to two qubits for storing the four local unitary ope... 详细信息

关键词：量子通信多重量子紧凑编码量子逻辑网络量子纠缠

Calculating model of mass action concentrations for Ag-Au-Cu melts

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第1期21卷 43-47页

作者： ZHANG Jian Metallurgy school, university of Science and Technology beijing, beijing 100083. china Metallurgy school University of Science and Technology Beijing 北京 100083

Based on phase diagrams and measured activities, the calculatingmodel of mass action concentrations for het- erogeneous meltsAg-Au-Cu was formulated. Calculated results agree with the improvedresults of recent research work, Showing that the model formulatedcan reflect the structural characteristics of these melts. In thismodel, without the help Of any empirical parameters, only threeequilibrium constants are used, hence it is simple, lear, andfavorable to the sim- Plification of calculation.

关键词： activity mass action concentration eutectic Solid solution