A Brief Introduction to the Key National Disciplines of College of Electrical and Electronic Engineering of Huazhong University of Science and Technology

The electrical engineering discipline of HUST is amongthe first batch of disciplines approved by the Academic DegreeEvaluating Committee of the State Council of China as entitledto confer the mastership and the doctorate (1981), the firstbatch of postdoctoral programs (1985), and the first batch ofdisciplines entitled to award the doctorate in top level discipline(1996). The electrical machinery and electrical apparatus discipline,and the power system and its automation discipline were elected asthe key national disciplines January 2002. Also, the electrical amchinery discipline is one of the original two key nationaldisciplines, and its Electrical Machinery State SpecializedLaboratory is the only state key laboratory in this field.     

Magnet Science and Technology for Basic Research at the High Field Laboratory for Superconducting Materials

1 Introduction The High Field Laboratory for SuperconductingMaterials(HFLSM)has demonstrated the activities formaterials science and condensed matter physics,especially for superconducting and magnetic materials.These activities have been supported by Ins…     

Three-Phase PWM Power Conversion——The Route to Ultra High Power Density and Efficiency

1 IntroductionDue to guidelines,recommendations and regulations con-cerning a limitation of the harmonic influence of power electronicsystems on the mains and based on the requirement of operationin a wide input voltage range numerous three-phase PWM con-…     

Approaching Genre and Genre-based Pedagogies——A Non-native Foreign Language Teacher''''s Perspective

This paper fir st explores and discusses the meanings of terms "genre, genre analysis and genre-based pedagogies" based on the relevant literature, then summarizes and analyzes the criticisms on and arguments for genre-based pedagogies. It aims to identify the important role of genre-based approaches in foreign language instruction and some strategies in teaching.     

Approaching Genre and Genre-based Pedagogies——A Non-native Foreign Language Teacher＇s Perspective

This paper first explores and discusses the meanings of terms ＂genre, genre analysis and genre-based pedagogies＂ based on the relevant literature, then summarizes and analyzes the criticisms on and arguments for genre-based pedagogies. It aims to identify the important role of genre-based approaches in foreign language instruction and some strategies in teaching.     

Investigation of the High Frequency Properties of BST Thin Films—A Comparison of Three Different Commonly Used Methods

In this work three different commonly used high frequency measurement techniques for the determination of the electrical properties of BST thin films are compared. Two of the three setups determine the permittivity and the loss factor of planar sapphire capacitors by either measuring the reflection coefficient or the influence onto the resonance frequencies of two coupled microstrip resonators. The third setup utilizes the differential propagation constant of two identical coplanar wave guides (CPW) of different length to calculate the permittivity and the loss factor of the involved sapphire substrate. It is found that the latter method shows the best accuracy for the measurement of the permittivity and the loss factor of the sapphire substrates over a broad frequency range. Measurements of BST coated sapphire substrates are presented using this technique.     

Diagnosis and Forecast of Chinese Power Industry——An interview with Mr. Song Yonghua, Academician of Royal Academy of Engineering and expert of China power reform under UN Development Program

Fundamental changes will arise in world en- ergy structure in 21st century Journalist of China Electric Power (referred as Journalist below for short): Being a world famous scholar, would you please explain the world energy focus briefly with a globalism …     

A Special Report of Visit to Director Zhang Xiaolu of Department of Science &Technology and Environmental Protection, the State Power Corporation of China──Top Leveled Enterprise Must Possess Top Leveled Science & Technology Innovation Ability

China, it is saggar as the world trend. For a long period thescience and technology personnel have watched and followedthe necessary world op and new technologies and guidingtechnical developments. belong these are: an cell, superconductor, ultra op voltage DC transmission, clean coalcombushon and generation technology, etc. Some researchresults have been papally trial used.I. It shotild be acknOWledged that the real strength of ourscience and technology as compared with world adVanced level…     

(Reactive) Templated Grain Growth of Textured Sodium Bismuth Titanate (Na1/2Bi1/2TiO3-BaTiO3) Ceramics—II Dielectric and Piezoelectric Properties

(Na_1/2Bi_1/2)TiO₃-BaTiO₃ (<6.5% BaTiO₃) ceramics with <001>_pc orientation were fabricated by Templated Grain Growth (TGG) or Reactive Templated Grain Growth (RTGG) using tabular SrTiO₃ template particles. The maximum electrically-induced strain was 0.26% at 70 kV/cm. d₃₃ coefficients over 500 pC/N were obtained for highly textured samples (f 90%) when driven at high electric fields. Under these conditions, the materials show considerable hysteresis in the strain—field response, even after poling. Berlincourt piezoelectric coefficients for the same samples gave d₃₃ of 200 pC/N.     

A Review of: “The General Theory of Alternating Current Machines: Application to Practical Problems-” Bernard Adkins and Ronȧld G. Harley (London: Chapman and Hall, 1975, 279 pp.) Reviewed by Stephen A. Sebo,Department of Electrical Engineering,Ohio State University,Columbus, Ohio 43210.

ABSTRACT

This paper presents a new formulation of the optimal power flow problem suggesting a single objective function for real and reactive power dispatch. This objective function is nothing but the sum of the cost of active generation and system losses satisfying the network constraints. The objective function and constraints are expressed in terms of real and imaginary parts of bus voltages and line parameters. The generalized reduced gradient technique has been used to solve this problem. Effectiveness of this formulation is demonstrated by taking examples of actual networks.     

A Comparison of the Thermodynamic and Series Capacitance Analysis of the Electrode-Film Interface on the Dielectric Behavior of Ferroelectric Films—Ba0.4Sr0.6TiO3

The dielectric constant of Ba_0.4Sr_0.6TiO₃ films exhibited both bias field dependence and thickness dependence. In thin films, the electrode-film interface influences the dielectric behaviour. This interface is analysed by two methods: Conventionally the film-electrode interface has been explained in terms of a barrier layer at the film electrode interface. An alternative method is to introduce an electrode-dielectric interface energy to the Devonshire phenomenology to describe the thickness dependence of dielectric constant. The existence of barrier is established which influences the measured value in films, but it is not exactly possible to pinpoint its origin and eliminate its effect by theoretical models.