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Interfacial Characteristics of Carbon Nanotube-Polyethylene Composites Using Molecular Dynamics Simulations

International Scholarly Research Notices 2011年第1期2011卷

作者： Z. Q. Zhang D. K. Ward Y. Xue H. W. Zhang M. F. Horstemeyer Center of Micro/Nano Science and Technology Jiangsu University Zhenjiang 212013 *** Department of Engineering Mechanics and State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Liaoning Dalian 116024 *** Radiation and Nucleation Detection Materials and Analysis Department Sandia National Laboratories Livermore CA 94550 USAsandia.gov Department of Mechanical and Aerospace Engineering Utah State University Logan UT 84322 USAusu.edu Center for Advanced Vehicular Systems Mississippi State University Mississippi State MS 39762 USAmsstate.edu

The rate-dependent interfacial behavior between a carbon nanotube (CNT) and a polyethylene (PE) matrix is investigated using molecular dynamics (MD) simulations. Various MD simulations were set up to determine the “size” effects on the interfacial properties, such as the molecular weight, or the length of the polymer, the diameter of the CNT, and the simulation model size. The interfacial rate-dependency was probed by applying various relative sliding velocities between the CNT and the polymer. Two quantities, directly obtained from the MD simulations, described the interfacial properties: the critical interfacial shear stress (CISS) and the steady interfacial shear stress (SISS). The simulations show that the SISS was not sensitive to the simulation size. In addition, the CISS was dependent upon the combined factors of the variation in PE stiffness, induced by simulation size changes and the effect of the fixed boundaries of the simulation models. The CISS increases almost linearly with the relative sliding velocity of CNTs. Also, a linear relationship between the SISS and the CNT-sliding velocity is observed when the SISS drops below a critical value. A clear size scaling is observed as the CISS and SISS decrease with increasing CNT radius and increase with the increasing polymer chain length.

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An extended PI model for hysteresis and creep compensation in AFM based nanomanipulation

An extended PI model for hysteresis and creep compensation i...

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IEEE International Conference on robotics and Biomimetics

作者： Zhiyu Wang Lianqing Liu Zhidong Wang Zaili Dong Shuai Yuan Faculty of Electrical and Control Engineering Liaoning Technical University Huludao China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy and Sciences Shenyang China Chinese Academy and Sciences Beijing China Department of Advanced Robotics Chiba Institute of Technology Chiba Japan Chinese Academy of Sciences Beijing Beijing CN

ISBN: (纸本)9781424493197

One of the prerequisites for AFM based nanomanipulation is that the tip position can be controlled accurately, while this prerequisite is still hindered by the large model uncertainties aroused from PZT nonlinearity such as hysteresis and creep. In this paper, an Extended Prandtl-Ishlinskii (EPI) model is proposed to solve these problems. The main advantage of EPI model over conventional PI model is that the EPI model can compensate the positioning error caused by hysteresis and creep simultaneously through adopting the new adaptive basic operator. The experimental results demonstrate the effectiveness and validity of EPI model in depicting the PZT hysteresis and creep prosperities.

关键词： Creep Hysteresis Fitting Data models Adaptation model Robot sensing systems

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Atomic structures of Ag atoms deposition on Fe/Cu (001) substrate

Atomic structures of Ag atoms deposition on Fe/Cu (001) subs...

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第三届全国计算原子与分子物理学术会议

作者： Ji-Yuan Guo Chun-Xiang Xu State Key Laboratory of Bioelectronics Advanced Photonics Center Southeast University Nanjing 210096 P. R. China College of Mathematics and Physics Jiangsu University of Science and TechnologyZhenjiang 212001 P. R. China) State Key Laboratory of Bioelectronics Advanced Photonics Center Southeast University Nanjing 210096 P. R. China

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Theoretical aspects of photon emission from a single quantum dot nanocavity system

Theoretical aspects of photon emission from a single quantum...

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IEEE International Nanoelectronics Conference (INEC)

作者： Guangcun Shan Wei Huang Miao Zhang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy and Sciences Shanghai China Jiangsu Key Laboratory of Organic Electronics and Information Displays Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing China Faculty of Engineering National University of Singapore Singapore Singapore

In this work, we investigate the aspects of photon emitted from a single quantum dot exciton, strongly coupled to a planar nanocavity, from which the exact spectrum is derived. By using the rigorous medium-dependent theory of fully quantized cavity-QED formulas, the exact spectrum is reduced to two separate forms, in terms of the leaky cavity mode emission and the radiation mode emission. In the strong coupling regime, it is concluded that several new effects should be associated with the leaky cavity mode emission, including the appearance of an off-resonance cavity mode and a loss-induced on-resonance spectral triplet. The cavity mode emission is shown to completely dominate the emitted spectrum, even for large cavity-exciton detunings, whereby the usual cavity-QED formulas developed for radiation-mode emission drastically fail. These predictions are in qualitative agreement with several observations reported in recent experiments, and apply to a wide range of semiconductor nanocavity photonic devices.

关键词： Quantum dots Quantum mechanics Photonics Laboratories Organic materials Nanoscale devices Informatics Information technology Organic electronics Displays

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Local Fractional Fourier's Transform Based on the Local Fractional Calculus

Local Fractional Fourier's Transform Based on the Local Frac...

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International Conference on Electrical and Control Engineering (ICECE)

作者： Xiaojun Yang Zongxin Kang Changhe Liu Shanghai TAYEE Electric Co. Ltd Shanghai China School of Mechanics and Civil Engineering China University of Mining & Technology Xuzhou Jiangsu China Key Laboratory of Advanced Display and System Application Shanghai University Shanghai China

A new modeling for the local fractional Fourier's transform containing the local fractional calculus is investigated in fractional space. The properties of the local fractional Fourier's transform are obtained... 详细信息

关键词： Control engineering

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Effect of interlayer on the mechanical properties of YG8 hard carbide/40Cr steel brazed joints

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China Welding 2009年第2期18卷 30-34页

作者：吴铭方浦娟陈健 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

The effects of Cu foil and Ni foil on the mechanical properties of YG8 hard carbide/4OCr steel brazed joints were investigated. The results show that both Cu foil and Ni foil were beneficial to decrease the residual stress and enhance the joint strength. Moreover, Ni foil exhibited the better impact on enhancing the joint strength relative to Cu foil. When Cu foil was used as interlayer material, the key factor to restrain the joint strength was the massive and quick dissolution of Cu. Therefore, in order to prevent the excessive dissolution of Cu foil, the process parameter should be controlled strictly in the brazing process.

关键词： YG8 hard carbide 40Cr steel brazing interlayer strength

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Strength and interfacial microstructure of Si3N4 joint brazed with amorphous Ti-Zr-Ni-Cu filler metal

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China Welding 2009年第1期18卷 57-61页

作者：邹家生周权吕思聪 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

In this paper, the vacuum brazing of Si3N4 ceramic was carried out with Ti40Zr25Ni15Cu20 amorphous filler metal. The interfacial microstructure was investigated by scanning electron microscopy （ SEM ）, energy dispersive spectroscopy （EDS） etc. According to the analysis, the interface reaction layer was mode up of TiN abut on the ceramic and the Ti-Si, Zr-Si compounds. The influence of brazing temperature and holding time on the joint strength was also studied. The results shows that the joint strength first increased and then decreased with the increasing of holding time and brazing temperature. The joint strength was significantly affected by the thickness of the reaction layer. Under the same experimental conditions, the joint brazed with amorphous filler metal exhibits much higher strength compared with the one brazed with crystalline filler metal with the same composition. To achieve higher joint strength at relatively low temperature, it is favorable to use the amorphous filler metal than the crystalline filler metal.

关键词： Ti-Zr-Ni-Cu amorphous filler metal Si3 N4 ceramics joint strength interfacial structure

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Sparse representation based on projection method in online least squares support vector machines

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控制理论与应用（英文版） 2009年第2期7卷 163-168页

作者： Lijuan LI Hongye SU Jian CHU State Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou Zhejiang 310027 China College of Automation Nanjing University of Technology Nanjing Jiangsu 210009 China

A sparse approximation algorithm based on projection is presented in this paper in order to overcome the limitation of the non-sparsity of least squares support vector machines （LS-SVM）. The new inputs are projected into the subspace spanned by previous basis vectors （BV） and those inputs whose squared distance from the subspace is higher than a threshold are added in the BV set, while others are rejected. This consequently results in the sparse approximation. In addition, a recursive approach to deleting an exiting vector in the BV set is proposed. Then the online LS-SVM, sparse approximation and BV removal are combined to produce the sparse online LS-SVM algorithm that can control the size of memory irrespective of the processed data size. The suggested algorithm is applied in the online modeling of a pH neutralizing process and the isomerization plant of a refinery, respectively. The detailed comparison of computing time and precision is also given between the suggested algorithm and the nonsparse one. The results show that the proposed algorithm greatly improves the sparsity just with little cost of precision.

关键词： Least squares support vector machines Projection Sparsity pH neutralizing process Isomerization

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The Corrosion Behavior of Ni-Y Binary Alloys in Air and in Molten (0.62Li,0.38K)_2CO_3 Mixture at 650℃

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Journal of Wuhan University of technology(Materials Science) 2009年第S1期24卷 115-118页

作者：郭平义 Jiangsu Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology

The corrosion behavior of pure Ni and of binary Ni-Y alloys containing 1wt%,3wt%,5wt% Y,respectively,was investigated in air and in the eutectic (0.62Li,0.38K)2CO3 mixture at 650 ℃.The alloys are two-phase composed of γ-Ni solid solution and intermetallic compound *** experimental results indicated that the corrosion of Ni-Y alloys in air and in molten salts,respectively,produced an external NiO scale with a small amount of Y2O3 and an internal oxidation region composed of Ni and Y2O3 resulting from the oxidation of the intermetallic phase *** presence of yttrium in the alloy had a positive effect on the lithiation reaction of NiO during immersion in the melt.

关键词： molten carbonates Ni-Y alloys oxidation corrosion

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Effects of Ga and In on the properties of cadmium-free Ag-Cu-Zn filler metal

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China Welding 2009年第4期18卷 33-38页

作者：赖忠民薛松柏卢方焱顾立勇顾文华 College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003. Changshu Huayin Filler Metals Co. Ltd. Changshu 215513.

Melting temperature, spreadability, mechanical properties and the microstructures of joints brazed with silver-base filler metals including different amounts of Ga and/or In were studied respectively in this paper, and the results show that the melting temperature of the silver-base filler metals is decreased, spreadability of the silver-base filler metals is improved, and the microstructures of silver-base filh, r metals are refined obviously with the addition of Ga and/or In. Using copper and brass plates as base metal and brazing with flame method, the mechanical properties of the lap-joint and butt joint were also examined and analyzed respectively, and the results indicate that the fracture position of two kinds of brazed joints occurred on the base metal, except for the lap-joint of brass, which shows better mechanical properties of the joints brazed with the silver- based filler metals including Ga. For the lap-joint of brass, the tensile strength gradually increased with the increase of Ga content, while the addition of In has little effect on mechanical properties. It is also found that the best comprehensive properties of cadmium-free Ag-Cu-Zn filler metals are obtained when Ga content is about 3.0 wt. % and In content is between 1.5 wt. % and 2. 0 wt. %.

关键词： silver-base filler metal melting temperature spreadability mechanical properties mierostructure

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