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Development of high plasticity Al-Si alloy and its casting process

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中国有色金属学会会刊：英文版 2002年第6期12卷 1103-1106页

作者：郭国文李元元陈维平张大童龙雁 college of Mechanical Engineering South China University of Technology

Aiming to meet the challenge of the shape complexity and high plasticity demanded for the upper connective plate(UCP) in motorcycle, a high plasticity Al Si alloy named HGZL 02 was developed by optimizing the chemical composition and casting process. Premium UCP castings were obtained by using optimized casting process. Results show that fine and dense microstructure are obtained in the UCP castings. An average of 224 MPa in ultimate tensile strength, 149 MPa in yield strength and 13.2% in elongation are achieved for T6 heat treated UPS castings.

关键词：高可塑性铝硅合金永久铸模铸造

Identifying the interactions in a colored dynamical network

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Chinese Physics B 2015年第11期24卷 77-80页

作者：吴召艳弓晓利 college of Mathematics and Information Science Jiangxi Normal University

The interactions of a colored dynamical network play a great role in its dynamical behaviour and are denoted by outer and inner coupling matrices. In this paper, the outer and inner coupting matrices are assumed to be unknown and need to be identified. A corresponding network estimator is designed for identifying the unknown interactions by adopting proper adaptive laws. Based on the Lyapunov function method and Barbalat＇s lemma, the obtained result is analytically proved. A colored network coupled with chaotic Lorenz, Chen, and Lii systems is considered as a numerical example to illustrate the effectiveness of the proposed method.

关键词： colored network interaction identification

Band-rejection filter based on a Bragg fiber with a defect layer

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Chinese Optics Letters 2010年第3期8卷 259-261页

作者：何忠蛟 college of Information and Electronic Engineering Zhejiang Gongshang University

A novel band-rejection filter based on a Bragg fiber with a defect layer is proposed. A defect layer is introduced in the periodic high/low index layers in the cladding of the Bragg fiber, which results in large confinement loss for some resonant wavelengths inside the band gap range of the Bragg fiber. A segment of the Bragg fiber with a defect layer can be used as a band-rejection filter, whose characteristics are mainly determined by the structure of the Bragg fiber. The simulation results show that the bandwidth of such a band-rejection filter is dependent on the number of the periodic high/low index layers in both sides of the defect layer in the cladding of the Bragg fiber.

关键词： Bragg cells Defects Fibers

Analysis of interlaminar stress and nonlinear dynamic response for composite laminated plates with interfacial damage

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Acta Mechanica Sinica 2008年第6期24卷 709-720页

作者： F.H.Zhu .M.Fu college of Mechanics and Aerospace Hunan University410082 ChangshaChina

By considering the effect of interfacial damage and using the variation principle, three-dimensional nonlinear dynamic governing equations of the laminated plates with interfacial damage are derived based on the general sixdegrees-of-freedom plate theory towards the accurate stress analysis. The solutions of interlaminar stress and nonlinear dynamic response for a simply supported laminated plate with interfacial damage are obtained by using the finite difference method, and the results are validated by comparison with the solution of nonlinear finite element method. In numerical calculations, the effects of interfacial damage on the stress in the interface and the nonlinear dynamic response of laminated plates are discussed.

关键词： Laminated plates Geometric nonlinearity Accurate stress analysis Interfacial damage Interlaminar stress Nonlinear dynamic response

Screen and Capacity of Predominant Strain for Toluene Biodegradation in Groundwater

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Chemical Research in Chinese Universities 2004年第5期20卷 539-542页

作者： Taboure Aboubacar college of Environment and Resources Jilin University Changchun 130026

The soil nearby a gas station was collected, from which we isolated a series of strains by means of enrichment and screening technigues. The most effective strain for the degradation of toluene, i.e., JYZ0315 was screened by the further mutation of the above strains. The degradation capacity experiment was carried out in simulated groundwater. Under the optimal conditions, the degradation rate could reach 93.5%. During the extend application experiments with a percolation tank, the degradation of toluene reached 87.3% in 11 d and 95.2% in 15 d, which was close to that of the microenvironment, and this proves that JYZ0315 is one of the predominant strains to degrade toluene in groundwater.

关键词： Toluene Groundwater Predominant strain of degradation

Calculation of Rydberg energy levels for the francium atom

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Chinese Physics B 2010年第6期19卷 231-234页

作者：黄时中褚进民 college of Physics and Electrical Information Anhui Normal University

Based on the weakest bound electron potential model theory, the Rydberg energy levels and quantum defects of the nP^2P^o1/2 （n=7-50） and np^2P^o3/2 （n=7-50） spectrum series for the francium atom are calculated. The calculated results are in excellent agreement with the 48 measured levels, and 40 energy levels for highly excited states are predicted.

关键词： weakest bound electron potential model theory francium atom Rydberg energy level

Numerical simulation in powder compaction of metallurgy component

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Transactions of Nonferrous Metals Society of China 2006年第6期7卷 1353-1357页

作者：黄春曼陈普庆邵明李元元 college of Mechanical Engineering South China University of Technology

Some flow stress models was used to simulate the compaction of a cylindrical specimen.A new flow stress model was presented by analyzing and summarizing the powder compact experiment with different initial *** with other models,the new model fits better with the *** compaction process of a synchronizer hub was simulated with new model and the synchronizer hub shape was improved by the simulation *** density distribution was measured and compared with the simulation results of splitting the samples into *** comparison shows that the model could be used to simulate the powder compact process in an efficient and accurate *** the results indicate that the density distribution is homogenous after optimization.

关键词： powder compaction design distribution numerical simulation

Investigation of mechanical properties of twin gold crystal nanowires under uniaxial load by molecular dynamics method

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Chinese Physics B 2016年第8期25卷 279-283页

作者：张国伟杨在林罗刚 college of Aerospace and Civil Engineering Harbin Engineering University

Twin gold crystal nanowires, whose loading direction is parallel to the twin boundary orientation, are *** calculate the nanowires under tensile or compressive loads, different length nanowires, and different twin boundary nanowires respectively. The Young modulus of nanowires under compressive load is about twice that under tensile *** compressive properties of twin gold nanowires are superior to their tensile properties. For different length nanowires,there is a critical value of length with respect to the mechanical properties. When the length of nanowire is greater than the critical value, its mechanical properties are sensitive to length. The twin boundary spacing hardly affects the mechanical properties.

关键词： molecular dynamics twinned crystal boundary gold nanowires uniaxial load mechanical prop-erties

Three-color upconversion luminescence of rare earth codoped oxyhalide tellurite glasses

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Journal of Rare Earths 2008年第6期26卷 895-898页

作者：徐时清王玮邓德刚赵士龙王焕平鞠海东 college of Materials Science and Engineering China Jiliang University

The red, green, and blue upconversion properties of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses were studied under 980 nm LD excitation. The intense red （657 nm）, green （530 and 545 nm）, and blue （476 nm） emissions were simultaneously observed at room temperature. The results showed that the mixed halide modified tellurite glass （TZFCB） had strong upconversion emissions. The effect of halide on upconversion intensity was observed and discussed, and possible upconversion mechanisms were evaluated. The intense red, green, and blue upconversion luminescence of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses might be a potentially useful material for developing three-dimensional displays applications.

关键词： oxyhalide tellurite glass upconversion luminescence three-dimensional volumetric display rare earths