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WAYS OF STABILIZING CONTINUOUS UNIDIRECTIONAL SOLIDIFICATION PROCESS AND VERIFICATION TESTS

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中国有色金属学会会刊：英文版 1998年第2期8卷 25-30页

作者： Chang Guowei, Zhang hu, Wang Zidong, Wang Jingsong and hu hanqiSchool of Materials science and Engineering,university of science and technology beijing, beijing 100083, P. R. china

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关键词： unidirectional solidification continuous casting pure aluminium AlCu alloy

Comparison of the Molecular Interaction Volume Model with the Unified Interaction Parameter Formalism in the Fe-Cr-Ni Liquid Alloys at 1873 K

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Journal of Materials science & technology 2006年第4期22卷 559-564页

作者： Dongping TAO faculty of Materials and Metallurgical Engineering, Kunming university of science and technology, Kunming 650093, china faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China

The molecular interaction volume model (MIVM) for a general ternary system was deduced in detail for further clarifying and understanding its general multicomponent expression. Both MIVM and the unified interaction parameter formalism (UIPF) can be used to predict the activities of solutes and solvents in the Fe-Cr-Ni liquid alloys. But the former employs only the infinite dilute activity coefficients, and the later is not applicable without the dilute binary and ternary interaction parameters. MIVM has a certain physical meaning from the viewpoint of statistical thermodynamics, so it is an alternative for the estimation of activity coefficients of the solutes and solvents in a dilute or finite concentration metal solution where the interaction parameters are absent or their accuracies are questionable.

关键词： Activity Prediction Molecular interaction volume model Unified interaction parameter formalism

Influence of Aluminum Content in γ-TiAl with L1_0 Structure during Ordering Processes

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Rare Metals 2001年第4期20卷 230-235页

作者： Timothée Nsongot1,2 Xiaodong Ni1,3 Guoliang Chen1, Keh-Minn Chang4 1) State Key Laboratory for Advanced Metals and Materials, university of science and technology beijing, beijing 100083, china 2) faculty of science, P. 0. Box 69, Brazzaville, Congo Univ Sci & Technol beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China Fac Sci Brazzaville Rep Congo Univ Sci & Technol beijing Dept Phys Beijing 100083 Peoples R China W Virginia Univ Dept Mech & Aerosp Engn Morgantown WV 26506 USA

Based on EAM (embedded atom method) interatomic potential, the effect of aluminum content on the type of order-disorder transformation (ODT) and the structure properties (lattice constants, volume, c/a ratio and configu- ration energy) during ordering processes was investigated for γ-TiAI based alloys. Results show that for the alloys with lower than 50%Al (all composition is in atom number fraction), the ODT is the first order transition, and the second order transition for the alloys with equal or higher than 50% Al. The increase of aluminum content results in the critical temperature increasing. The aluminum content has a very little effect on the lattice constants, the volume and the c/a ratio, but has a significant effect on the configuration energy. A metastable disordered state was found for the alloys with less than 50%Al.

关键词： TiA1 order-disorder transformation long-range order

Weighted estimates for the multilinear singular integral operators with non-smooth kernels

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science china Mathematics 2011年第3期54卷 587-602页

作者： hu GuoEn1 & LU ShanZhen2 1Department of Applied Mathematics, Zhengzhou Information science and technology Institute, Zhengzhou 450002, china 2Department of Mathematics, beijing Normal university, beijing 100875, china 1. Department of Applied Mathematics Zhengzhou Information Science and Technology Institute Zhengzhou 450002 China2. Department of Mathematics Beijing Normal University Beijing 100875 China

In this paper, by sharp function estimates and certain weak type endpoint estimates, the authors establish some weighted norm inequalities with Ap weights for the multilinear singular integral operators with non-smoot... 详细信息

关键词： approximation to the identity weighted norm inequality singular integral operator non-smooth kernel Calderón-Zygmund decomposition

Study on the drug resistance and the binding mode of HIV-1 integrase with LCA inhibitor

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science china Chemistry 2007年第5期50卷 665-674页

作者： hu JianPing1,2, CHANG Shan1, CHEN WeiZu1 & WANG CunXin1 1 College of Life science and Bioengineering, beijing university of technology, beijing 100022, china 2 Department of Chemistry & Life sciences, Leshan Normal university, Leshan 614004, china College of Life science and Bioengineering Beijing University ofTechnologyBeijing 100022China Department of Chemistry & Life sciences Leshan NormalUniversityLeshan 614004China

human immunodeficiency virus type 1 (HIV-1) integrase (IN) is an essential enzyme in the lifecycle of this virus and also an important target for the study of anti-HIV drugs. The binding mode of the wild type IN core domain and its G140S mutant with L-Chicoric acid (LCA) inhibitor were investigated by using multiple conformation molecular docking and molecular dynamics (MD) simulation. Based on the binding modes, the drug resistance mechanism was explored for the G140S mutant of IN with LCA. The results indicate that the binding site of the G140S mutant of IN core domain with LCA is different from that of the core domain of the wild type IN, which leads to the partial loss of inhibition potency of LCA. The flexibility of the IN functional loop region and the interactions between Mg2+ ion and the three key residues (i.e., D64, D116, E152) stimulate the biological operation of IN. The drug resistance also lies in several other important effects, such as the repulsion between LCA and E152 in the G140S mutant core domain, the weakening of K159 binding with LCA and Y143 pointing to the pocket of the G140S mutant. All of the above simulation results agree well with experimental data, which provide us with some helpful information for designing the drug of anti-HIV based on the structure of IN.

关键词： molecular docking, MD simulation, HIV-1 IN, drug design

Distribution,formation and evolution of sand ridges on the East china Sea shelf

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science china(Technological sciences) 2010年第3期53卷 822-828页

作者： ZHAO RenBao 1,2,SUN HaiTao 3,WU YaSheng 3 &ZHAO ChuanFeng 1,2 1MOE Key Laboratory of Petroleum Engineering,china university of Petroleum,beijing 102249,china 2 Enhanced Oil Recovering Research Center,china university of Petroleum,beijing 102249,china 3faculty of Natural Resource&Information technology,china university of Petroleum,beijing 102249,china 1. MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China2. Enhanced Oil Recovering Research Center China University of Petroleum Beijing 102249 China3. Faculty of Natural Resource & Information Technology China University of Petroleum Beijing 102249 China

Influence of CO2 corrosion on reservoir mineralogical composition,pore structure and their mechanical characteristics was studied using XRD,SEM,rock tri-axial machine and core flow experimental *** was found that the corrosion effect was mainly attributed to rock texture and structure,fluid composition and external dynamical conditions in the experimental *** cores with bedding structures,their bedding surfaces were the preferential corrosion regions,because micro-cracks would evolve at these surfaces in the pressure-releasing ***,for cores with massive structures controlled by stable water environment,the CO2 corrosion would result in pore enlargement and secondary pore *** gas velocity from outlet showed sharp increase in the injection process of CO2-H2O *** could be explained by two changes caused by *** was the opening and closure of *** other was particle *** the corrosion time increased,both tensile strength and compressive strength decreased,which confirmed decrease of cementation *** should also be noted that permeability increase and micro-cracks generation would pose damage to the capacity of CO2 geological storage.

关键词： carbon dioxide geological storage mineralization enhanced oil recovery corrosion

Fuzzy interface treatment in Eulerian method

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science china(Technological sciences) 2004年第5期47卷 550-568页

作者： NING Jianguo1 & CHEN Longwei1,2 1. National Key Laboratory of Protection and Control of Explosive Disaster, beijing Institute of technology, beijing 100081, china 2. The faculty of Land Resource Engineering, Kunming university of science and technology, Kunming 650093, china Correspondence should be addressed to Ning Jianguo 1. National Key Laboratory of Protection and Control of Explosive Disaster Beijing Institute of Technology 100081 Beijing China 2. The faculty of Land Resource Engineering Kunming University of Science and Technology 650093 Kunming China

In this paper, we incorporate fuzzy mathematics approach into the Eulerian method to simulate three dimensional multi-material interfaces. In particular, we propose a fuzzy interface treatment for describing interfaces, designing transport plans, and computing transport quantities. Using a set of three-dimensional inviscid isothermal elastic-plastic hydrodynamic equations, we simulate shaped charge jet in different filled dynamite structures. Strain and stress have been under consideration in simulations. Numerical results demonstrate that the fuzzy interface treatment is correct and efficient for three-dimensional multi-material problems.

关键词： Eulerian method, multi-material, fuzzy interface, shaped charge jet, three-dimensional numerical simulation.

LOW-DIMENSIONAL GALERKIN METHOD AND ITS ROLE IN QUALITATIVE ANALYSIS OF NONLINEAR BEHAVIOR OF BLUFF BODY WAKES

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中国科学院大学学报 1998年第2期 2-9页

作者： Tong Binggang (The Graduate School at beijing,university of science and technology of china,beijing 100039) Yin Xieyuan\ \ Sun Dejun\ \ hu Guohui (Department of Modern Mechanics,university of science and technology of china,Hefei 230026)\ \

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关键词： low dimensional Galerkin method cylinder wake flow instability and bifurcation study Karman vortex street Floquet stability analysis

Phase behavior of TXs/toluene/water microemulsion systems for solubilization absorption of toluene

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Journal of Environmental sciences 2010年第2期22卷 271-276页

作者： Lian Liu,Senlin Tian ,Ping Ning faculty of Environmental science and Engineering,Kunming university of science and technology,Kunming 650093,china [a] faculty of Environmental science Engineering Kunming University of Science technology Kunming 650093 China

Triton Xs （TXs） surfactants/cosurfactant/water/oil （toluene） microemulsion systems for enhancing toluene solubilization were proposed and its potential was investigated for toluene removal from gas stream. The results indicated that TX-100 was superior to other TXs surfactants in removing toluene without cosurfactant. The efficiency of cosurfactants for improving toluene solubilization capacity follows the order： amine 〉 alcohol 〉 acid. According to the factor analysis, the linear cosurfactants are better than the branched ones. The effects of hydrophile-lipophile balance （HLB）, salt （NaCl） concentration and temperature on the formation of microemulsion system were also discussed. The results suggested that the optimum value of HLB was 15, the effect of NaCl concentration on the system was inconspicuous and the lower temperature enhanced the solubilization capacity. Nonionic surfactant-based microemulsions had a significant absorption enhancement for toluene, indicated by as much as 82.72% of toluene in phase composition diagram, which will have a great prospect in air pollution treatment.

关键词： microemulsion phase behavior absorption toluene