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Calculation of Inelastic Neutron Scattering on ^(11)B

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Chinese journal of nuclear physics 1995年第3期17卷 265-267页

作者： Xie Wen-fang Department of Physics,Guangdong university of technology,Guangzhou 510090Ruan Wen-ying Department of Physics,south china university of technology,Guangzhou 510641 广东工业大学物理系广东广州 510090 华南理工大学物理系广东广州

The microscopic DWBA was used to calculate the inelastic neutron scattering on 11B to 2.14MeV excited state and some energy dependent parameters were used to improve the *** inte-grated inelastic cross sections and the angular distributions of the 11B（n,n′）11B*（2.14 MeV excitedstate）were given for the incident neutrons whose energy varies from 7.54 MeV to 20.0 *** also given for the experimental blank data.

关键词： Inelastic neutron scattering Microscopic DWBA Integrated cross section Angular distribution

Periodic blow-up solutions and their limit forms for the generalized Camassa-Holm equation

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Progress in Natural Science:Materials International 2008年第3期18卷 259-266页

作者： Zhengrong Liu a, Boling Guob a School of Mathematical Sciences, south china university of technology, Guangzhou 510640, china b Institute of Applied Physics and Computational Mathematics, Beijing 100088, china School of Mathematical Sciences South China University of Technology Guangzhou 510640 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper, we consider the generalized Camassa-Holm equation ut+2kux-uxxt+ au~2ux=2uxuxx+uuxxxUnder substitution ξ=x-ct, some new explicit periodic wave solutions and their limit forms are presented through some special phase orbits. These periodic wave solutions tend to infinity on ξ-u plane periodically. Thus we call them periodic blow-up solutions. To our knowledge, such periodic blow-up solutions have not been found in any other equations.

关键词： Generalized Camassa–Holm equation Explicit solutions Periodic blow-up

Two new types of bounded waves of CH-γ equation

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Science china Mathematics 2005年第12期48卷 1618-1630页

作者： GUO Boling & LIU Zhengrong Institute of Applied Physics and Computational Mathematics, Beijing 100088, china School of Mathematical Sciences and Center for Nonlinear Science Studies, south china university of technology, Guangzhou 510640, china 1. Institute of Applied Physics and Computational Mathematics 100088 Beijing China 2. School of Mathematical Sciences and Center for Nonlinear Science Studies South China University of Technology 510640 Guangzhou China

In this paper, the bifurcation method of dynamical systems and numerical approach of differential equations are employed to study CH-γ equation. Two new types of bounded waves are found. One of them is called the compacton. The other is called the generalized kink wave. Their planar graphs are simulated and their implicit expressions are given. The identity of theoretical derivation and numerical simulation is displayed.

关键词： CH-γ equation,compactons,generalized kink waves.

A Simplified Method to Calculate the Wet Bulb Globe Temperature(WBGT)

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湖南大学学报（自然科学版） 2009年第S1期36卷 40-44页

作者： ZHANG Lei,MENG Qing-lin,ZHAO Li-hua,ZHANG Yu-feng(State Key Laboratory of Subtropical Building Science,south china university of technology,Guangzhou,Guangdong 510640,china) State Key Laboratory of Subtropical Building Science South China University of Technology Guangzhou 510640 China

Wet bulb globe temperature(WBGT)is a comprehensive index obtained mainly from three parameters:black globe temperature(Tg),wet bulb temperature(Tw),and dry bulb temperature(Ta).While in field observation and numerical simulation,black globe temperature and wet bulb temperature were not easy to obtain,so WBGT was difficult to measure and calculate *** order to solve this problem,air dry bulb temperature,wet bulb temperature,globe temperature,relative humidity,mean air velocity,solar radiation and wet bulb globe temperature were collected during the summer(July)in *** analysis and regression analysis were used to get a simplified method to calculate *** results showed that dry bulb temperature,relative humidity,solar radiation and WBGT were interrelated to some *** three parameters could be used in the simplified method to predict WBGT,and the linear correlation and precision of this model were *** addition,we used the measured data to verify the simplified method,and the results showed that the error of the calculated value and the measured value was all below 5%,which means the simplified calculating method is feasible and can be used in field observation and simulation research of urban thermal environment.

关键词： hot and humid regions urban thermal environment wet bulb globe temperature multivariate linear regression

PROPERTIES AND MORPHOLOGY OF UNSATURATED POLYESTER/ACRYLATE-TERMINATED POLYURETHANE/ORGANO-MONTMORILLONITE NANOCOMPOSITES

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Chinese Journal of Polymer Science 2005年第5期23卷 471-478页

作者： Chang-jiang You Jin-guo Xu Song Xi Xiao-xia Duan Jie Shen and De-min Jia College of Materials Science and Engineering,south china university of technology,Guangzhou 510640,china S china Univ Technol Coll Mat Sci & Engn Guangzhou 510640 Peoples R China

Unsaturated polyester resin （UPR）/acrylate-terminated polyurethane （ATPU）/organo-modified montmorillonite （OMMT） nanocomposites were prepared by the in situ intercalative polymerization method. Samples were prepared by the sequential mixing, i.e. mixture of the ATPU and styrene （S） and OMMT were prepared in the first step; UPR was then added to the pre-intercalates of ATPU/S/OMMT. Results indicate that the mechanical properties and thermal properties of UPR/ATPU/OMMT nanocomposites greatly depend on the amount of ATPU and OMMT. Results show that the addition of ATPU could increase the impact strength of UPR/ATPU composites, but the tensile strength, flexural strength and heat resistance of the materials are obviously decreased. When the weight ratio between UPR, ATPU and OMMT were 82：15：3, the impact strength and heat distortion-temperature of nanocomposite were greatly improved, meanwhile there was little change for other properties of the nanocomposites. The synergistic enhancement effects of ATPU and OMMT on the composites were observed. The structures and morphology of the composites were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy.

关键词： Unsaturated polyester Acrylic terminal polyurethane Organo-modified montmorillonite Nanocomposite.

INFLUENCE OF SUPERPLASED SHAPE MEMORY ALLOY ON ITSMEMORY EFFECT

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Chinese Journal of Mechanical Engineering 1994年第4期7卷 251-256页

作者： Ruan Feng Zeng Rong Lin Fayu(south china university of technology)

An investigation has been made on the fine grain supeoplasticity of alloy, Cu-26.69%Zn-3.82% Al and its effect of superpolastic deformation (SPD) on the shape memory effect (SME).This alloy has the behavior of the fine grain superplasticity and SME simultaneousty. The rolledstructure of the alloy obtains equiaxial grains after the supeaplastic pretreatment. The alloy presentsmaximum total elogation of 545%, at the deformation temperature of 600℃ and the tensile rate of0.5mm / min. After supeperplastic deformation, the memory effect of the alloy is remarkably im-proved, the angle recovery rate and the enthalpies of transformation increase, the attenuation ofSME decreases, and the characteristic temperatures are lowered.

关键词： Shape memory alloy Superplasticity Memory effect

Analysis of Road Base Uniformity via the Deviation of Modulus of Asphalt Mixtures

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Journal of Wuhan university of technology(Materials Science) 2007年第2期22卷 367-370页

作者：职雨风 Road Research Institute South China University of Technology

The modulus deviation of base material calculated from the data of falling weight deflectometer （FWD） was used to evaluate the uniformity of road base so as to reflect the construction quality. Four parameters,the repeatability standard deviation of the data in the same driveway, the reproducibility standard deviation of the data in the different driveway, the consistency statistics value of the data in the different driveway, and the consistency statistics value of the data in the same driveway, were introduced for the construction uniformity analysis. The experimental result shows that the materials modulus calculated from FWD has a highly correlative relationship with the uniformity of road base.

关键词： road base material modulus falling weight deflectometer (FWD)

NUMERICAL ANALYSIS AND COMPUTER SIMULATION OF FORMATION OF RESIDUAL STRESSES IN GRINDING PROCESS

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Chinese Journal of Mechanical Engineering 1997年第4期10卷 2-8,65页

作者： Hu Huanan Zhou Zehua Chen Chengzhou south china university of technology

A theoretical method of solution for residual stresses in ground surface is developed. A new model for analysing the residual stresses is proposed, and a finite element analysing software for solution of two dimension thermal elasto plastic problem with moving loading is developed. Numerical analysis and computer simulation of formation of residual stresses in grinding process are conducted by means of this software. The theoretical basis is provided for controlling residual stresses of machined surface, and for precisely machining.

关键词： Grinding Residual stress Finite element method Computer simulation

Mechanically Driven Alloying and Structural Evolution of Nanocrystalline Fe_(60)Cu_(40) Powder

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Journal of Materials Science & technology 1997年第4期13卷 354-358页

作者： Yuanda DONG and Xueming MA(School of Materials Science and Engineering, Shanghai university, Shanghai 200072, china)Yuanzheng YANG(Dept. of Mechanical Engineering(2), south china university of technology, Guangzhou 510641, china)Fangxin LIU and Genmiao WA School of Materials Science and Engineering Shanghai University Shanghai 200072 China Dept. of Mechanical Engineering(2) South China University of Technology Guangzhou 510641 China Lab. of Structure Analysis University of Science and Technology of China Hefei 230026 China

Highly supersaturated nanocrystalline fcc Fe60Cu40 alloy has been prepared by mechanical alloying of elemental powders. The phase transformation is monitored by X-ray diffraction (XRD),Mossbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). The powder obtained after milling is of single fcc structure with grain size of nanometer order. The Mossbauer spectra of the milled powder can be fitted by two subspectra whose hyperfine magnetic fields are 16 MA/m and 20 MA/m while that of pure Fe disappeared. EXAFS results show that the radial structure function (RSF) of Fe K-edge changed drastically and finally became similar to that of reference Cu K-edge, while that of Cu K-edge nearly keeps unchanged in the process of milling. These imply that bcc Fe really transforms to fcc structure and alloying between Fe and Cu occurs truly on an atomic scale. EXAFS results indicate that iron atoms tend to segregate at the boundaries and Cu atoms are rich in the fcc lattice. Annealing experiments show that the Fe atoms at the interfaces are easy to cluster to α-Fe at a lower temperature, whereas the iron atoms in the lattice will form γ-Fe first at temperature above 350℃, and then transform to bcc Fe

关键词： Mechanically Driven Alloying and Structural Evolution of Nanocrystalline Fe MA Cu Powder Figure