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Some New Exact Solutions of mKdV Equations

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Communications in Theoretical Physics 2006年第5期45卷 790-792页

作者： GONG Lun-Xun zheng qiang YUE Ping School of Science Guizhou Normal University Guiyang 550001 China

New exact solutions are determined to the coupled mKdV equations by means of modified mapping method.

关键词： mKdV equations modified mapping method traveling wave solutions

Effect of flow control mold on flow field during high-speed continuous casting

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Advances in Manufacturing 2017年第3期5卷 271-278页

作者： Zhan Yu zheng-qiang Zhang Zhong-Ming Ren Nanjing Iron and Steel Co. Ltd. Nanjing 210035 JiangsuPeople's Republic of China Shanghai Key Laboratory of Modem Metallurgy andMaterials Processing Shanghai University Shanghai 200072 People's Republic of China

An experimental mold was built to study the flow in a flow control mold under high speed continuous casting. The effect of the magnetic field on the flow was investigated using mercury. The results show that the magnetic field can not only dampen the flow of liquid metal but also change its direction, and then redistribute the flow in the mold. When maintaining a constant distance between magnets, the fluctuation of the free surface is dampened because of the increasing magnetic flux density. The flow at the free surface is improved, and the penetration depth of the downward stream is reduced. The decrease in the dis- tance between magnets promotes the brake effect and the flow is dampened in the upper eddy.

关键词： High-speed continuous casting Flow control(FC) mold Flow of liquid metal ·Electromagnetic brake

GLASS TRANSITION OF HYDRATED WHEAT GLIADIN POWDERS

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Chinese Journal of Polymer Science 2011年第4期29卷 483-489页

作者： Shao-min Sun Li Zhao Yi-hu Song qiang zheng Department of Polymer Science and Engineering Zhejiang University Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Zhejiang University

Modulated-temperature differential scanning calorimetric and dynamic mechanical analyses and dielectric spectroscopy were used to investigate the glass transition of hydrated wheat gliadin powders with moisture absorption ranged from 2.30 db% to 18.21 db%. Glass transition temperature （Tg） of dry wheat gliadin was estimated according to the Gordon- Taylor equation. Structural heterogeneity at high degrees of hydration was revealed in dielectric temperature and frequency spectra. The activation energies （Ea） of the two relaxations were calculated from Arrhenius equation.

关键词： Hydrated gliadin Glass transition MDSC DMA Dielectric spectra.

Crystalline Morphology and Crystallization Characteristics of In-situ Blends of Anionic Polyamide 6 with Noncrystallizable Semiaromatic Polyamide Copolymer

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Chemical Research in Chinese Universities 2007年第3期23卷 360-365页

作者： WANG Xiao-chun zheng qiang YANG Gui-sheng Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Hangzhou 310027 P. R. China Key Laboratory＇of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences Beijing 100080 P. R. China

A noncrystallizable semiaromatic polyamide copolymer（NSAP） was dissolved in molten caprolactam, and PA6/ NSAP blends were produced in-situ via the anionic ring-opening polymerization of caprolactam. The presence of a single loss tangent（tanS） peak measured by means of dynamic mechanical analysis（DMA） proves the miscibility between PA6 and NSAP in the blends. It was found that there existed drastic changes in the crystallographic form and crystallization kinetics for the in-situ blends, e.g. , when 20% NSAP was added, nearly all crystallites existed in the ,y form and the crystallization could hardly occur upon cooling even at a rate of 2.5 ℃/min. Moreover, cold crystallization appears during the subsequent heating, and its melting point is 40 ℃ lower than that of the virgin system. On the other hand, the size of the spherulites only decreases modestly. It is suggested that the introduction of irregular stiff segments originated from NSAP into PA6 macromolecule chain, which resulted from transamidation during the polymerization play a dominant role in the drastic change of crystallization kinetics and the resultant morphology of the in-situ blends.

关键词： In-situ blend Noncrystallizable polyamide copelymer Anionic polymerization Morphology Crystallization

Optimal quantum parameter estimation of two-qutrit Heisenberg XY chain under decoherence

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Chinese Physics B 2017年第1期26卷 145-150页

作者： Hong-ying Yang qiang zheng Qi-jun Zhi School of Physics and Electronics Guizhou Normal University Guiyang 550001 China School of Mathematics Guizhou Normal University Guiyang 550001 China

Adopting the Milburn decoherence model, we investigate the performance of quantum Fisher information of the twoqutrit isotropic Heisenberg XY chain under decoherence. We find that the quantum Fisher information with respect to the decoherence rate and the magnetic field decreases exponentially in the long-time limit, which significantly reduces the precision of optimal quantum estimation. We also show that with the increase of the decoherence rate or the magnetic field,the QFIs go down considerably. Furthermore, we find that the precision of optimal quantum estimation can be enhanced by the entanglement in the input state.

关键词： intrinsic decoherence quantum Fisher information spin chain

Scattering for 3D Cubic Focusing NLS on the Domain Outside a Convex Obstacle Revisited

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Acta Mathematica Sinica,English Series 2022年第6期38卷 1054-1068页

作者： Cheng Bin XU Teng Fei ZHAO Ji qiang zheng The Graduate School of China Academy of Engineering Physics Beijing 100088P.R.China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083P.R.China Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088P.R.China

In this article,we consider the focusing cubic nonlinear Schr?dinger equation(NLS)in the exterior domain outside of a convex obstacle in R3with Dirichlet boundary *** revisit the scattering result below ground state in Killip-Visan-Zhang[The focusing cubic NLS on exterior domains in three ***,1,146-180(2016)]by utilizing the method of Dodson and Murphy[A new proof of scattering below the ground state for the 3d radial focusing cubic ***.,145,4859-4867(2017)]and the dispersive estimate in Ivanovici and Lebeau[Dispersion for the wave and the Schr?dinger equations outside strictly convex obstacles and ***.,355,774-779(2017)],which avoids using the concentration *** conquer the difficulty of the boundary in the focusing case by establishing a local smoothing effect of the *** on this effect and the interaction Morawetz estimates,we prove that the solution decays at a large time interval,which meets the scattering criterion.

关键词： Schrodinger equation exterior domain global well-posedness scattering criterion

Impact of China’s outward foreign direct investment on environmental pollution in the home country

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Chinese Journal of Population,Resources and Environment 2021年第3期19卷 221-229页

作者： Guo Yang qiang zheng Chongqing Academy of Social Sciences Chongqing400020China Center for Southeast Asian Studies Chongqing Technology and Business UniversityChongqing400067China School of Economics Chongqing Technology and Business UniversityChongqing400067China Research Center for Economy of Upper Reaches of the Yangtze River Chongqing Technology and Business UniversityChongqing400067China

In the context of economic globalization and increasingly tight resource and environmental constraints,the environmental effect of open economy has been highly concerned by the academic *** the implementation of the“Going Global”campaign and the“Belt and Road Initiative”,China’s OFDI has been *** is the impact of the rapid growth of OFDI on the home environment?How can China improve the quality and level of OFDI in order to promote domestic green development under the dual context of constructing a new dual circulation development pattern and advocating green development?These questions deserve further *** of the existing literature focuses on the empirical interpretation of OFDI’s home country environmental effect by using linear models,while few involve nonlinear *** literature on the important role of financial development in home country and the threshold effect of OFDI on home country environment is even less *** view of this,based on the mechanism of argumentation and propositional inference,this paper calculated the environmental pollution index of 30 provinces in China from 2003 to 2017 by using China’s provincial panel data of these years and selecting industrial waste water,industrial waste gas,industrial SO_(2),and industrial soot emissions and industrial solid waste production amount ***,this paper empirically studied China's OFDI home environment of financial development threshold effect by constructing financial development as the threshold variables panel threshold *** results showed that:①China’s OFDI had a significant impact on the environment of the home country,based on the level of financial development of the home *** China’s financial development level was lower than the first threshold value,China’s OFDI had a significant restraining effect on environmental pollution in the home *** China’s financial development level crossed the first threshold value but did not exc

关键词： Environmental pollution Outward foreign direct investment Financial development Threshold model

Linear Dynamic Viscoelastic Response of Melts for Crosslinkable Polyethylene Insulation Cable Granules During Cross-linking

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Chemical Research in Chinese Universities 2010年第1期26卷 142-147页

作者： YANG Hong-mei YANG Yong-zhu HE Xiao zheng qiang ZHOU Hou-qiang Department of Polymer Science and Engineering Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Zhejiang University Hangzhou 310027 P. R. China Ningbo Dongfang Cable Ltd. Ningbo 315040 R R. China

Two commercial crosslinkable polyethylene insulation cable granules, designed for 110 and 35 kV voltage insulation, with similar crosslinking temperature but different melting temperature, were chosen as experimental samples for examining their linear dynamic responses during cross-linking. It has been found that the gel contents of cable compounds for 110 and 35 kV insulation are almost the same after they have been cross-linked at the same temperature, pressure and time. And the sample melts show the similar dependence of the dynamic storage modulus, G; on strain. On the other hand, the dynamic temperature ramp test and the dynamic time sweep test indicate that the samples exhibit different dynamic viscoelastic responses during their crosslinking. An expression for describing their erosslinking process was proposed via probing rheokinetics of crosslinking for the two samples.

关键词： XLPE Insulation cable Crosslinking Rheological behavior

Recent Advances in Asymmetric Structural Composites for Excellent Electromagnetic Interference Shielding: A Review

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Chinese Journal of Polymer Science 2024年第6期42卷 693-710页

作者： Ying Zhou Bai Xue Lan Xie Chang-Mei Wu qiang zheng Department of Polymer Materials and Engineering College of Materials and Metallurgy Guizhou University National Engineering Research Center for Compounding and Modification of Polymer Materials National and Local Joint Engineering Research Center for Functional Polymer Membrane Materials and Membrane Processes State Key Laboratory of Public Big Data Guizhou University Department of Polymer Science and Engineering Zhejiang University

Since electromagnetic pollution is detrimental to human health and the environment, numerous efforts have been successively made to achieve excellent electromagnetic interference shielding effectiveness(EMI SE) via designing the hierarchical structures for electromagnetic interference(EMI) shielding polymer composites. Among the plentiful structures, the asymmetric structures are currently a hot spot, principally categorizing into multi-layered, porous, fibrous, and segregated asymmetric structures, which endows the high EMI shielding performance for polymer composites incorporated with magnetic, conductive, and/or dielectric micro/nano-fillers, due to the “absorption-reflection-reabsorption” shielding mechanism. Therefore, this review provides the retrospection and summary of the efforts with respect to abundant asymmetric structures and multifunctional micro/nano-fillers for enhancing EMI shielding properties, which is conducive to the booming development of polymeric EMI shielding materials for the promising prospect in modern electronics and 5-generation(5G) technology.

关键词： Asymmetric structure Micro/nano functional filler Polymer composite Electromagnetic interference shielding