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Electron-Phonon Interaction in an Annular Quantum Dot

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Communications in Theoretical Physics 2008年第2期49卷 493-503页

作者： WU Bo XIE hong-jing School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China

The confined longitudinal-optical （LO） phonon and surface-optical （SO） phonon modes of a free-standing annular cylindrical quantum dot are derived within the framework of dielectric continuum approximation. It is found that there exist two types of SO phonon modes： top SO （TSO） mode and side SO（SSO） mode in a cylindrical quantum annulus. Numerical calculation on CdS annulus system has been performed. Results reveal that the two different solutions of SSO mode distribute mainly at the inner or outer surfaces of the annulus. The dispersion relations and the coupling intensions of phonons in a quantum annulus are compared with those in a cylindrical quantum dot. It is found that the dispersion relations of the two different structures are similar, but the coupling intension of the phonon-electron interaction in quantum annulus is larger than that in quantum dot. The Hamiltonians describing the free phonon modes and their interactions with electrons in the system are also derived.

关键词： dielectric continuum approximation phonon modes electron-phonon interaction annular quantum dots

Polar Interface Optical Phonon Modes and Froehlich Electron－Phonon Interaction Hamiltonians in an Arbitrary Layer－Number Quantum Well System

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Communications in Theoretical Physics 2003年第2X期40卷 225-230页

作者： ZHANGLi hong-jing CHENChuan-Yu DepartmentofMechanicsandElectronics PanyuPolytechnicsCollegePanyu511483China DepartmentofPhysics GuangzhouUniversityGuihuagangCampusGuangzhou510405China

By using determinant method as in our recent work, the IO phonon modes, the orthogonal relation for polarization vector, electron-IO phonon F^6hlich interaction Hamiltonian, the dispersion relation, and the electron-phonon coupling function in an arbitrary layer-number quantum well system have been derived and investigated within the framework of dielectric continuum approximation. Numerical calculation on seven-layer AlxGal-xAs/GaAs systems have been performed. Via the numerical results in this work and previous works, the general characters of the IO phonon modes in an n-layer coupling quantum well system were concluded and summarized. This work can be regarded as a generalization of previous works on IO phonon modes in some fLxed layer-number quantum well systems, and it provides a uniform method to investittate the effects of IO phonons on the multi-layer coupling quantum well systems.

关键词：极性界面光学声子模型耦合量子阱电子-声子相互作用哈密顿函数多层量子阱

Local pointwise convergence of the 3D finite element

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Applied Mathematics(A Journal of Chinese Universities) 2023年第2期38卷 210-222页

作者： LIU jing-hong ZHU Qi-ding College of Science Guangdong University of Petrochemical TechnologyMaoming 525000China School of Mathematics and Statistics Hunan Normal UniversityChangsha 410081China

For an elliptic problem with variable coefficients in three dimensions,this article discusses local pointwise convergence of the three-dimensional(3D)finite ***,the Green's function and the derivative Green's function are ***,some relationship of norms such as L^(2)-norms,W^(1,∞)-norms,and negative-norms in locally smooth subsets of the domainΩis ***,local pointwise convergence properties of the finite element approximation are obtained.

关键词： nite element local convergence Green's function

Studies on the Rice LEAF INCLINATION1 （LC1）, an IAA-amido Synthetase, Reveal the Effects of Auxin in Leaf Inclination Control

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Molecular Plant 2013年第1期6卷 174-187页

作者： Shu-Qing Zhao jing-jing Xiang hong-Wei Xue National Key Laboratory of Plant Molecular Genetics institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences ChineseAcademy of Sciences Shanghai 200032 China

The angle of rice leaf inclination is an important agronomic trait and closely related to the yields and archi- tecture of crops. Although few mutants with altered leaf angles have been reported, the molecular mechanism remains to be elucidated, especially whether hormones are involved in this process. Through genetic screening, a rice gain-of- function mutant leaf inclination1, Icl-D, was identified from the Shanghai T-DNA Insertion Population （SHIP）. Phenotypic analysis confirmed the exaggerated leaf angles of Icl-D due to the stimulated cell elongation at the lamina joint. LC1 is transcribed in various tissues and encodes OsGH3-1, an indole-3-acetic acid （IAA） amido synthetase, whose homolog of Arabidopsis functions in maintaining the auxin homeostasis by conjugating excess IAA to various amino acids. Indeed, recombinant LC1 can catalyze the conjugation of IAA to Ala, Asp, and Asn in vitro, which is consistent with the decreased free IAA amount in Icl-D mutant. Icl-D is insensitive to IAA and hypersensitive to exogenous BR, in agreement with the microarray analysis that reveals the altered transcriptions of genes involved in auxin signaling and BR biosynthesis. These results indicate the crucial roles of auxin homeostasis in the leaf inclination control.

关键词： rice leaf inclination auxin GH3.

Bacterial diversity in soils around a lead and zinc mine

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Journal of Environmental Sciences 2007年第1期19卷 74-79页

作者： HU Qing QI hong-yan ZENG jing-hai ZHANG hong-xun Department of Environmental Biotechnology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Five samples of soil collected from a lead and zinc mine were used to assess the effect of combined contamination of heavy metals on soil bacterial communities using a polyphasic approach including characterization of isolates by culture method, community level catabolic profiling in BIOLOG GN microplates, and genetic community fingerprinting by denaturing gradient gel electrophoresis of 16S rDNA fragments amplified by PCR from community DNA （PCR-DGGE）. The structure of the bacterial community was affected to a certain extent by heavy metals. The PCR-DGGE analysis of 16S rRNA genes showed that there were significant differences in the structure of the microbial community among the soil samples, which were related to the contamination levels. The number of bacteria and the number of denaturing gradient gel electrophoresis （DGGE） bands in the soils increased with increasing distance from the lead and zinc mine tailing, whereas the concentration of lead （Pb） and cadmium （Cd） was decreased. Heavily polluted soils could be characterized by a community that differs from those of lightly polluted soils in richness and structure of dominating bacterial populations. The clustering analysis of the DGGE profiles showed that the bacteria in all the five samples of soil belonged to three clusters. The data from the BIOLOG analysis also showed the same result. This study showed that heavy metal contamination decreased both the biomass and diversity of the bacterial community in soil.

关键词： BIOLOG system DGGE heavy metal microbial diversity soils

Multisymplectic Pseudospectral Discretizations for(3+1)-Dimensional Klein-Gordon Equation

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Communications in Theoretical Physics 2008年第11期50卷 1052-1054页

作者： CHEN jing-Bo LIU hong Institute of Geology and Geophysics Chinese Academy of Sciences P.O. Box 9825 Beijing 100029 China

We explore the multisymplectic Fourier pseudospectral discretizations for the (3+1)-dimensional Klein-Gordon equation in this *** corresponding multisymplectic conservation laws are *** kinds of explicitsymplectic int... 详细信息

关键词： multisymplectic pseudospectral (3+1)-dimensional Klein Gordon equation

Evolutionary Computation for Large-scale Multi-objective Optimization: A Decade of Progresses

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International Journal of Automation and computing 2021年第2期18卷 155-169页

作者： Wen-jing hong Peng Yang Ke Tang Guangdong Provincial Key Laboratory of Brain-inspired Intelligent Computation Department of Computer Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Department of Management Science University of Science and Technology of ChinaHefei 230027China Guangdong–hong Kong–Macao Greater Bay Area Center for Brain Science and Brain–inspired Intelligence Guangzhou 510515China

Large-scale multi-objective optimization problems(MOPs)that involve a large number of decision variables,have emerged from many real-world *** evolutionary algorithms(EAs)have been widely acknowledged as a mainstream method for MOPs,most research progress and successful applications of EAs have been restricted to MOPs with small-scale decision *** recently,it has been reported that traditional multi-objective EAs(MOEAs)suffer severe deterioration with the increase of decision *** a result,and motivated by the emergence of real-world large-scale MOPs,investigation of MOEAs in this aspect has attracted much more attention in the past *** paper reviews the progress of evolutionary computation for large-scale multi-objective optimization from two *** the key difficulties of the large-scale MOPs,the scalability analysis is discussed by focusing on the performance of existing MOEAs and the challenges induced by the increase of the number of decision *** the perspective of methodology,the large-scale MOEAs are categorized into three classes and introduced respectively:divide and conquer based,dimensionality reduction based and enhanced search-based *** future research directions are also discussed.

关键词： Large-scale multi-objective optimization high-dimensional search space evolutionary computation evolutionary algorithms scalability

Plate-like carbon-supported Fe_(3)C nanoparticles with superior electrochemical performance

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Rare Metals 2021年第6期40卷 1402-1411页

作者： Chuan Chen Sen Qian Tian-Hao Yao jing-hong Guo hong-Kang Wang Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Future Science ParkBeijing 102209China Department of Electric Power Sensing Technology Future Science ParkGlobal Energy Interconnection Research Institute Co.LtdBeijing 102209China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity *** address this issue,we report a facile synthesis of plate-like carbonsupported Fe_(3)C nanoparticles through chemical blowing/carbonization under *** ultrafine Fe_(3)C nanoparticles are prone to be oxidized when exposing in air;thus,Fe_(3)C/C with mild oxidization and the fully oxidized product of Fe_(2)O_(3)/C are successfully prepared by controlling the oxidization *** applied as an anode material in LIB,the Fe_(3)C/C electrode demonstrates excellent cycle stability(826 mAh·g^(-1)after 120 cycles under 500 mA·g^(-1))and rate performance(410.6 mAh·g^(-1) under 2 A·g^(-1)),compared with the Fe_(2)O_(3)/C *** enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe_(3)C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe_(3)C *** importantly,this work may offer new approaches to synthesize other transition metal(e.g.,Co,Ni)-based anode material by replacing the precursor ingredient.

关键词： Lithium-ion batteries Fe_(3)C Mild oxidation Anode material Lithium storage

Mei Symmetry and Lutzky Conserved Quantity for Nonholonomic Mechanical System with Unilateral Constraints

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Communications in Theoretical Physics 2008年第3期49卷 575-578页

作者： jing hong-Xing LI Yuan-Cheng College of Physics Science and Technology China University of Petroleum （East China） Dongying 257061 China

In this paper, we study the Mei symmetry which can result in a Lutzky conserved quantity for nonholonomic mechanical system with unilateral constraints. The definition and the criterion of the Mei symmetry for the system are given. The necessary and sufficient condition under which the Mei symmetry is a Lie symmetry for the system is obtained. A Lutzky conserved quantity deduced from the Mei symmetry is gotten. An example is given to illustrate the application of our results.

关键词： nonholonomic mechanical system unilateral constraint Mei symmetry Lutzky conserved quantity