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审美化教学在二语习得中的理论基础研究
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作者 高渊媛 《湖北经济学院学报(人文社会科学版)》 2012年第5期200-201,共2页
20世纪末21世纪初,我国教育研究者开始将审美化教学与各个学科相结合,提出了应用于不同学习阶段和具体课程的教学模式,但将审美化教学与二语习得中的相关理论结合并用于指导高层次的英语教学实践的研究还较少。本文在对二语习得中动态... 20世纪末21世纪初,我国教育研究者开始将审美化教学与各个学科相结合,提出了应用于不同学习阶段和具体课程的教学模式,但将审美化教学与二语习得中的相关理论结合并用于指导高层次的英语教学实践的研究还较少。本文在对二语习得中动态理论和混乱/复杂理论阐释的基础上,指出在国外两种理论的指导下,审美化教学在英语课堂应用中带给我们的一些启发和思考。 展开更多
关键词 审美化教学 动态理论 混乱/复杂理论
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“中国英语”概念的破与立 被引量:3
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作者 魏淑遐 《上海理工大学学报(社会科学版)》 2015年第4期335-339,共5页
为了厘清"中国英语"(China English)与"中式英语"(Chinese English)的渊源关系,借助语料库工具,逐一检索分析葛传椝最初提出China English概念时所列举的汉英译文例证,发现多数译文依旧属于传统意义上的Chinese Eng... 为了厘清"中国英语"(China English)与"中式英语"(Chinese English)的渊源关系,借助语料库工具,逐一检索分析葛传椝最初提出China English概念时所列举的汉英译文例证,发现多数译文依旧属于传统意义上的Chinese English(中式英语),并非与之相互对立、泾渭分明,因此推翻了这一界定。然而,鉴于China English一直被后人直译为"中国英语"广为沿用,且长久以来其内涵与外延不断演化,导致不少学者出现概念混乱和无谓争论,因此,这一概念无法废除,而宜重新界定为"原生英语与中国语境相结合形成的、在形式和(或)内容上具有中国特色的派生英语",如此方可终止这一乱象。 展开更多
关键词 中国英语 中式英语 原生英语 派生英语 理论混乱
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Thermal Expansion Coefficients of Thin Crystal Films 被引量:6
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作者 HUANG Jian-Ping WU Xue-Zhong LI Sheng-Yi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期921-924,共4页
The formulas for atomic displacements and Hamiltonian of a thin crystal film in phonon occupation number representation are obtained with the aid of Green's function theory. On the basis of these results, the form... The formulas for atomic displacements and Hamiltonian of a thin crystal film in phonon occupation number representation are obtained with the aid of Green's function theory. On the basis of these results, the formulas for thermal expansion coefficients of the thin crystal film are derived with the perturbation theory, and the numerical calculations are carried out. The results show that the thinner films have larger thermal expansion coefficients. 展开更多
关键词 thermal expansion coefficients thin crystal film Green's function perturbation theory
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Perturbation to Symmetries and Adiabatic Invariants of Nonholonomic System in Terms of Quasi-coordinates 被引量:4
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作者 CHEN Xiang-Wei ZHAO Yong-Hong LI Yan-Min 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期773-778,共6页
Based on the theory of Lie symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic system in terms of quasi-coordinates are studied. The perturbation to symmetries for the no... Based on the theory of Lie symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic system in terms of quasi-coordinates are studied. The perturbation to symmetries for the nonholonomic system in terms of quasi-coordinates under small excitation is discussed. The concept of high-order adiabatic invariant is presented, and the forms of exact invariants and adiabatic invariants as well as the conditions for their existence are given. Then the corresponding inverse problem is studied. 展开更多
关键词 nonholonomic system in terms of quasi-coordinates PERTURBATION exact invariant adiabatic invariant
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Effect of Magnetic-Impurity Scattering in Disordered Two-Dimensional Square Lattices Around Half Filling
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作者 QIAN Feng YANG Yong-Hong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期929-935,共7页
Abstract Weak-localization effect in the presence of magnetic impurities is studied in disordered two-dimensional tight-binding square lattices around half filling. Both the magnetic and nonmagnetic impurities are ass... Abstract Weak-localization effect in the presence of magnetic impurities is studied in disordered two-dimensional tight-binding square lattices around half filling. Both the magnetic and nonmagnetic impurities are assumed to be randomly distributed on small fractions of the sites, while the nonmagnetic impurities have a strong potential yielding a unitary-limit scattering. We derive in details the expressions of diffusive π modes in the retarded-retarded (or advanced- advanced) channel, which result from the existence of particle-hole symmetry. The quantum interference correction to the density of states is calculated. While the magnetic-impurity scattering suppresses the quantum correction from π-mode cooperon, it does not affect the contribution of π-mode diffuson. 展开更多
关键词 weak localization magnetic impurity density of states two-dimensional lattice
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Modification of Classical SPM for Slightly Rough Surface Scattering with Low Grazing Angle Incidence
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作者 GUO Li-Xin WEI Guo-Hui +1 位作者 Kim Cheyoung WU Zhen-Sen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期901-907,共7页
Based on the impedance/admittance rough boundaries, the reflection coefficients and the scattering cross section with low grazing angle incidence are obtained for both VV and HH polarizations. The error of the classic... Based on the impedance/admittance rough boundaries, the reflection coefficients and the scattering cross section with low grazing angle incidence are obtained for both VV and HH polarizations. The error of the classical perturbation method at grazing angle is overcome for the vertical polarization at a rough Neumann boundary of infinite extent. The derivation of the formulae and the numerical results show that the backscattering cross section depends on the grazing angle to the fourth power for both Neumann and Dirichlet boundary conditions with low grazing angle incidence. Our results can reduce to that of the classical small perturbation method by neglecting the Neumann and Dirichlet boundary conditions. 展开更多
关键词 low grazing angle incidence electromagnetic scattering modification of small perturbation method
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Motion Geometric Active Contours: Tracking Nonrigid Objects in Clutter Background 被引量:1
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作者 岑峰 Qi Feihu 《High Technology Letters》 EI CAS 2003年第3期19-23,共5页
MGAC (Motion Geometric Active Contours), a new variational framework of geometric active contours to track multiple nonrigid moving objects in the clutter background in image sequences is presented. This framework, in... MGAC (Motion Geometric Active Contours), a new variational framework of geometric active contours to track multiple nonrigid moving objects in the clutter background in image sequences is presented. This framework, incorporating with the motion edge information, consists of motion detection and tracking stages. At the motion detection stage, the motion edge map provides an approximate edge map of the moving objects. Then, a tracking stage, merely using the static edge information, is considered to improve the motion detection result. Force field regularization method is used to extend the capture range of the edge attraction force field in both stages. Experiments demonstrate that the proposed framework is valid for tracking multiple nonrigid objects in the clutter background. 展开更多
关键词 object tracking active contours Level Set Theory clutter background
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Local Lyapunov Exponents and characteristics of fixed/periodic points embedded within a chaotic attractor
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作者 ALI M SAHA L.M 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第4期296-304,共9页
A chaotic dynamical system is characterized by a positive averaged exponential separation of two neighboring tra- jectories over a chaotic attractor. Knowledge of the Largest Lyapunov Exponent λ1 of a dynamical syste... A chaotic dynamical system is characterized by a positive averaged exponential separation of two neighboring tra- jectories over a chaotic attractor. Knowledge of the Largest Lyapunov Exponent λ1 of a dynamical system over a bounded attractor is necessary and sufficient for determining whether it is chaotic (λ1>0) or not (λ1≤0). We intended in this work to elaborate the connection between Local Lyapunov Exponents and the Largest Lyapunov Exponent where an alternative method to calculate λ1 has emerged. Finally, we investigated some characteristics of the fixed points and periodic orbits embedded within a chaotic attractor which led to the conclusion of the existence of chaotic attractors that may not embed in any fixed point or periodic orbit within it. 展开更多
关键词 Chaotic attractor Largest Lyapunov Exponent Local Lyapunov Exponents
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Symmetry in optics and photonics:a group theory approach 被引量:3
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作者 B.M.Rodriguez-Lara Ramy EI-Ganainy Julio Guerrero 《Science Bulletin》 SCIE EI CAS CSCD 2018年第4期244-251,共8页
Group theory(GT) provides a rigorous framework for studying symmetries in various disciplines in physics ranging from quantum field theories and the standard model to fluid mechanics and chaos theory. To date, the app... Group theory(GT) provides a rigorous framework for studying symmetries in various disciplines in physics ranging from quantum field theories and the standard model to fluid mechanics and chaos theory. To date, the application of such a powerful tool in optical physics remains limited. Over the past few years however, several quantum-inspired symmetry principles(such as parity-time invariance and supersymmetry) have been introduced in optics and photonics for the first time. Despite the intense activities in these new research directions, only few works utilized the power of group theory. Motivated by this status quo, here we present a brief overview of the application of GT in optics, deliberately choosing examples that illustrate the power of this tool in both continuous and discrete setups. We hope that this review will stimulate further research that exploits the full potential of GT for investigating various symmetry paradigms in optics, eventually leading to new photonic devices. 展开更多
关键词 Group theoryHelmholtz equationDiscrete opticsParity-time (PT) symmetry
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