“面向对象程序设计“双语教学实践与探讨

双语教学是我国高等教育与国际接轨,迎接新世纪挑战和教育改革发展的重要手段,也是当前教学改革的热点问题.本文结合近年来在“面向对象程序设计“双语教学实践过程中积累的经验教训,从课程的选择、教材和教辅资料的选择、教学环节的组织等方面对双语教学模式进行了探讨.     

大型发电机定子绕组端部的模态试验分析

介绍了模态分析的基本理论,以及用DI 2200实时快速傅立叶分析仪和ME'scopeVES模态分析软件对600MW发电机定子绕组端部所做的模态试验分析。     

A sliding mode control proposal for open-loop unstable processes

This papers presents a sliding mode controller based on a first-order-plus-dead-time model of the process for controlling open-loop unstable systems. The proposed controller has a simple and fixed structure with a set of tuning equations as a function of the desired performance. Both linear and nonlinear models were used to study the controller performance by computer simulations.     

关于大机组继电保护配置若干问题的讨论

结合继电保护规程、原国家电力公司颁发《反措》要求,以及华东电力设计院300MW及以上机组的设计实践,对大机组继电保护配置若干问题进行了粗浅的讨论,供设计时参考。     

Mixed-mode crack propagation through reinforced concrete

This paper presents the results of a very recent experimental research program aimed at investigating mixed-mode fracture of reinforced concrete. The tests were designed so that only one single mixed-mode crack generates and propagates through the specimen, as opposed to the usual dense crack pattern found in most of the tests in scientific literature. The specimens were three-point-bend beams of three different sizes. They were notched asymmetrically and reinforced with various ratios of longitudinal and inclined reinforcement. These experiments may help to understand the mechanisms of crack initiation and propagation through reinforcing bars under mixed-mode load conditions.     

主体参与教学模式在应用物理学基础课程中的实践与探究

在应用物理学专业的基础课程中实施主体参与教学．讨论了主体参与教学模式的内涵、特点、原则和程序，以及实施主体参与教学中所取得的成效和存在的问题，并对问题提出了相应的对策．     

高海拔地区锅炉经济运行方式的优化调整

随着西部经济的快速发展,电力需求也逐步增大,火力发电原材料——煤出现了市场供小于求,煤炭特性差异大等问题。优化调整锅炉运行方式是提高锅炉燃烧稳定性的重要环节。文章结合高海拔地区特有的环境,分析了影响锅炉经济运行方式的因素,指出了高海拔地区锅炉燃烧特点,提出了改变锅炉经济运行方式,实现优化调整的方法及措施。     

古田二级65MW水轮发电机双机兼容式频敏电刹车装置

新型频敏电刹车装置采用高能频敏电变阻器（ＧＢＰ）作为能耗设备,ＧＢＰ体积小,热容量大,能耗电阻具有频敏特性,它使机级在低速区产最优控制动力矩,频敏电刹车突出优点是：制动电流小,功率因数高,励磁容量低,理论和实践表明：新型频敏电刹车装置运行性能良好,是一项高新技术成果,应用前景看好,在兼容情况下,该装置性价比（Ｊ）为常规电制动（Ｊ）的（２－３）倍。     

A hybrid dual‐mode dielectric resonator antenna with wide beamwidth

A wide beamwidth rectangular dielectric resonator antenna (RDRA) working on dual modes is proposed in this letter. The radiator of the antenna with inside metallic posts and outside metallic walls is placed on a groundplane with a size of 2λ_g × 2λ_g. A TE′_δ21TE′_δ21 mode, which is similar to TE_δ21 mode, is generated by using the metallic posts inside the DR. By adjusting the height of metallic posts and the distance between the DRA and the metallic walls, the TE′_δ21 mode, and the TE_δ11 mode are superimposed with each other, widening the beamwidth of the RDRA to above 140° in both the E‐plane and H‐plane. This antenna works from 8.1 to 8.7 GHz with a relative bandwidth of 7.1%, which can be a good candidate in navigational systems.     

Adaptive high-order sliding mode control based on quasi-time delay estimation for uncertain robot manipulator

This paper presents the design, and validation of a new adaptive control system based on quasi-time delay estimation (Q-TDE) augmented with new integral second-order terminal sliding mode control (ISOTSMC) for a manipulator robot with unknown dynamic uncertainty and disturbances. Contrary to the conventional TDE, the proposed Q-TDE becomes sufficient to invoke a fixed artificial time delay and utilize the past data only of the control input to approximate the unknown system''s dynamic uncertainties. The incorporating of new adaptive reaching law with ISOTSMC augmented with Q-TDE policy ensures the continuous performance tracking of the robot manipulator''s trajectories using output feedback. This combination may achieve high performance with a significant chattering reducing procedure. By utilizing the Lyapunov function theory, it can be demonstrated that the robot system is stable and all signals in closed-loop are converging in finite time. Consequently, Simulation and comparative studies with two degrees of freedom robot manipulator were carried out to validate the effectiveness of the designed control scheme.