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γ-PHASE IN WC-Co CEMENTED CARBIDES

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中国有色金属学会会刊：英文版 1993年第2期3卷 51-57页

作者： Liu,Shourong tianjin Institute of Hard Alloy,tianjin 300222,china

The allotropic transformation process of the γ-phase in WC-Co cemented carbides has been *** of γ-grain and the γ-domain have been proposed forward:The γ-domain is the residual FCC-typeβ-Co grain that failed to transform when cooling alloy sample and γ-base is the HCP-type x-Co transformedmainly by means of diffusion,the outline of the γ-grain is consistent with the newly fromed β-Co grain formedat high *** quantity and distribution of γ-grain domain are related to the cooling rate after sinter-ing and influence the alloys properties.

关键词： WC-Co cemented carbides γ-grain γ-domain

Catalytic Oxidation of Cyclohexene to Adipic Acid with a Reaction-Controlled Phase-Transfer Catalyst

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催化学报 2003年第7期24卷 483-484页

作者： GUO Minglin (College of Materials and Chemical Engineering, tianjin Polytechnic University, tianjin 300160, china) College of Materials and Chemical Engineering Tianjin Polytechnic University 天津 300160

The goal of modern organic synthesis is to develop efficient catalytic methods to produce desired compounds in a cost-effective and environmentally benign manner. Hydrogen peroxide is a highly attractive oxidant because it is a cheap, mild and environmentally friendly reagent with a high content of active oxygen, and water is the only by-product. However, oxygen transfer from hydrogen peroxide to the substrate normally requires catalysts. The development of a process for the selective oxidation of cyclohexene to adipic acid with hydrogen peroxide has attracted the attention of many chemists. In 1998, Sato and coworkers reported the oxidation of cyclohexene to adipic acid using sodium tungstate and methyltrioctylammonium hydrogensulfate as catalysts. In 1999, Deng and co-workers reported the synthesis of adipic acid from cyclohexene with 30% hydrogen peroxide in the presence of a novel peroxytungstateorgnaic complex catalyst.

关键词：催化氧化反应环己烯脂肪酸反应控制相转移催化剂癸钨酸盐十二钨磷酸盐有机合成

A　COMPLETE　METRIC　OF　POSITIVE　CURVATURE　ON　R^n　AND　EXISTENCE　OF　CLOSED　GEODESICS

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Chinese Annals of Mathematics,Series B 1994年第3期15卷 293-298页

作者： ZHU DAXIN(Department of Mathematics, tianjin Universityl tianjin 300072, china.) 天津大学数学系天津 300072

ＡＣＯＭＰＬＥＴＥＭＥＴＲＩＣＯＦＰＯＳＩＴＩＶＥＣＵＲＶＡＴＵＲＥＯＮＲ~ｎＡＮＤＥＸＩＳＴＥＮＣＥＯＦＣＬＯＳＥＤＧＥＯＤＥＳＩＣＳ￥ＺＨＵＤＡＸＩＮ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，Ｔｉａｎｊｉ... 详细信息

ＡＣＯＭＰＬＥＴＥＭＥＴＲＩＣＯＦＰＯＳＩＴＩＶＥＣＵＲＶＡＴＵＲＥＯＮＲ~ｎＡＮＤＥＸＩＳＴＥＮＣＥＯＦＣＬＯＳＥＤＧＥＯＤＥＳＩＣＳ￥ＺＨＵＤＡＸＩＮ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙｌＴｉａｎｊ?..

关键词：正曲率完全标准测地学黎曼流形汉密尔顿系统

ON OUT-OF-PLANE BUCKLING OF ANISOTROPIC ELASTIC PLATE SUBJECTED TO A SIMPLE SHEAR

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Acta Mechanica Solida Sinica 2002年第3期15卷 236-243页

作者： Zhang Yitong (Department of Mechanics,tianjin University,tianjin 300072,china) Department of Mechanics Tianjin University Tianjin 300072 China

Out-of-plane buckling of anisotropic elastic plate subjected to asimple shear is investigated. From exact 3-D equilibrium conditionsof anisotropic elastic body with a plane of elastic symmetry atcritical Configuration, the equation for buckling direction (bucklingwave direction) parameter is derived and the Shape functions ofpossible buckling modes are obtained. The traction free boundaryconditions which must Hold on the upper and lower surfaces of platelead to a linear eigenvalue problem whose nontrivial solutions Arejust the possible buckling modes for the plate.

关键词： nonlinear elasticity buckling bifurcation anisotropic elastic plate

Experimental　Study　on　the　Optimization　of　Heat　and　Mass　Transfer　of　Industrial　Drying　of　the　TiO_2　Bulb　by　Infrared　Radiation

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Journal of Thermal Science 1996年第4期5卷 278-284页

作者： Zhu Kai Yang Junhong Li Xun Li Chunying Chu Zhide (Department of Thermal Energy Engineering, tianjin University, tianjin, 300072, china)Jiang Juyuan(The branch of tianjin University, tianjin, 300193, china) Department of Thermal Energy Engineering Tianjin University Tianjin China The branch of tianjin University Tianjin China

ＥｘｐｅｒｉｍｅｎｔａｌＳｔｕｄｙｏｎｔｈｅＯｐｔｉｍｉｚａｔｉｏｎｏｆＨｅａｔａｎｄＭａｓｓＴｒａｎｓｆｅｒｏｆＩｎｄｕｓｔｒｉａｌＤｒｙｉｎｇｏｆｔｈｅＴｉＯ_２ＢｕｌｂｂｙＩｎｆｒａｒｅｄ　ＲａｄｉａｔｉｏｎＥ... 详细信息

ＥｘｐｅｒｉｍｅｎｔａｌＳｔｕｄｙｏｎｔｈｅＯｐｔｉｍｉｚａｔｉｏｎｏｆＨｅａｔａｎｄＭａｓｓＴｒａｎｓｆｅｒｏｆＩｎｄｕｓｔｒｉａｌＤｒｙｉｎｇｏｆｔｈｅＴｉＯ_２ＢｕｌｂｂｙＩｎｆｒａｒｅｄ　ＲａｄｉａｔｉｏｎＥｘｐｅｒｉｍｅｎｔａｌＳｔｕｄｙｏ?..

关键词：热传导 TiO2 烘干红外辐照

Influence of p-layer on the performance of n-i-p μc-Si:H thin film solar cells

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2042-2046页

作者： YUAN YuJie 1,2,ZHANG KaiLiang 1,2,WEI Zhen 1,2 & GENG XinHua 3 1 College of Electronics Information Engineering,tianjin University of Technology,tianjin 300384,china 2 tianjin Key Laboratory of Film Electronic and Communication Devices,tianjin University of Technology,tianjin 300384,china 3 Institute of Photo-Electronics Thin Film Devices and Technique,Nankai University,tianjin 300071,china College of Electronics Information Engineering Tianjin University of Technology Tianjin China tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin China Institute of Photo-Electronics Thin Film Devices and Technique Nankai University Tianjin China

The high pressure radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) process was adopted to prepare the n-i-p microcrystalline silicon solar cells,the influence of p-type layers on the performance of the solar cells was investigated,and the optimum p layer suited to the n-i-p microcrystalline silicon solar cells was *** experimental results demonstrate that the performance of the solar cells can be highly affected by the structural and optical properties of the p-layers,and the performance of solar cells can be greatly improved by optimizing p *** have achieved an initial active-area efficiency of 8.17% (V oc =0.49 V,J sc =24.9 mA/cm 2 ,FF=67%) for the μc-Si:H single-junction n-i-p solar cells and an initial active-area efficiency of 10.93% (V oc =1.31 V,J sc =13.09 mA/cm 2 ,FF=64%) for the a-Si:H/μc-Si:H tandem n-i-p solar cells.

关键词： microcrystalline silicon solar cells quantum confinement effect p-type layers

Search for B_c (ns) via the B_c (ns) → B_c (ms) π^+ π^- transition at LHCb and Z^0 factory

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2019-2024页

作者： KE HongWei 1 & LI XueQian 2 1 School of Science,tianjin University,tianjin 300072,china 2 School of Physics,Nankai University,tianjin 300071,china School of Science Tianjin University Tianjin China School of Physics Nankai University Tianjin China

It is interesting to study the characteristics of the whole family of B c which contains two different heavy *** and the proposed Z 0 factory provide an opportunity because a large database of the B c family will be achieved.B c and its excited states can be identified via their decay *** suggested by experimentalists,B-c (ns) → B c +γ is not easy to be clearly measured,instead,the trajectories of π + and π- occurring in the decay of B c (ns) → B c (ms) + π + π( n > m ) can be unambiguously identified,thus the measurement seems easier and more reliable;therefore this mode is more favorable at the early running stage of LHCb and the proposed Z 0 *** this work,we calculate the rate of B c (ns) → B c (ms) + π + π-in terms of the QCD multipole-expansion and the numerical results indicate that the experimental measurements with the luminosity of LHC and Z 0 factory are feasible.

关键词： meson hadronic decay QCD multipole-expansion

Explicit and Weakly Implicit Schemes for a Class of Generalized KdV Equation

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Communications in Nonlinear Science and Numerical Simulation 1998年第3期3卷 187-189页

作者： Shaohong ZHU(Dept. of Mathematics, tianjin Normal University, tianjin 300074, china) Department of Mathematics Tianjin Normal University Tianjin 300074 China

In this paper, the convergence and stability of the explicit scheme and theweakly implicit scheme for a class of generallied KdV equation are proved. The sharpstability condition is obtained.

关键词： generalized KdV equation explicit scheme weakly implicit scheme convergence stability

Views on “Principle of limitation of physical quantities and cyclic universe”

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Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1772-1774页

作者： LI LianGang Department of Physics,School of Sciences,tianjin University,tianjin 300072,china Department of Physics School of Sciences Tianjin University Tianjin China

This paper presents an analysis of a paper entitled "Principle of limitation of physical quantities and cyclic universe" and proposes different results for some formulae from that *** addition,this paper shows that the principle of limits coupling may lead to an approximation of current theories(i.e.,quantum theory and relativistic theory),which have interesting correlations with the Plank formula and the special theory of relativity.

关键词： principle of limitation of physical quantities limits coupling formulae Plank formula theory of relativity