有源电力滤波器电流跟踪的一种改进算法

为了提高有源电力滤波器的电流跟踪性能,本文提出了一种电流跟踪控制的改进算法。该利用该算法控制逆变器输出电压,使电流误差在一个PWM周期内的平均值为零,从而更有效的跟踪电流。与一般电流跟踪方法相比,该方法能够更加有效的跟踪电流,从而更加有效的减少谐波含量。     

A refined integro-surface energy-based model for vibration of magnetically actuated double-nanowire-systems carrying electric current

A novel surface energy-based model is developed to examine more precisely vibrations of current-carrying double-nanowire-systems immersed in a longitudinal magnetic field. Using Biot-Savart and Lorentz laws, a more refined version of interwire interactional magnetic forces is presented. By employing Rayleigh beam theory, the equations of motion are derived. In fact, these are coupled integro-differential equations which are more accurate with respect to those of the previously developed models. For simply supported and clamped nanosystems, governing equations are analyzed via assumed mode method. The effects of interwire distance, slenderness ratio, electric current, magnetic field strength, and surface effect on the fundamental frequency are addressed carefully. The obtained results display the importance of exploiting the refined model for vibration analysis of nanosystems with low interwire distance, high electric current, and high magnetic field strength.     

Formulation of commons dilemma: Dawes model reconsidered

This paper examines Dawes (1975) model on commons dilemma (CD) situation and proposes an alternative model which formulates CD. Firstly, it makes clear that Dawes model does not have the characteristics of CD. Secondly, it specifies “resource unit condition” which models of commons dilemma must satisfy. Thirdly, it presents CD model, which is obtained by setting the condition in Dawes model. And lastly, it examines some nature of the proposed model and find that in CD situation, fine is distributed proportionally to each player's property.     

浅谈当下花鸟画图式的困境与出路

当下传统艺术门类花鸟画面临一些困境,比如疏朗简约的图式缺乏视觉张力,已不符合当代人的欣赏习惯和审美要求,程式化的图式已经成为阻碍当代花鸟画发展的巨石。只有在图式上进行创新,当代花鸟画才有出路,而艺术创新的一个重要策略便是图式的＂陌生化＂。     

试论《战争论》对郁达夫政论时评的影响

政论时评是郁达夫后期创作的一个重要方面。从郁达夫的政论时评中可以看出他深受克劳塞维茨《战争论》的影响。表现在他对抗战的政治与军事、军事策略、民众武装、精神力量和战争与经济文化各个方面的看法上。     

社会学视角下当代大学生的道德现状

当代大学生的道德现状一直是大众关注的焦点,该群体的道德风貌整体而言是积极向上的。时变事移,我们需要动态的了解、分析大学生群体的道德素质和修养,提出教育引导对策,着力于加强和改善大学生群体的道德建设。     

关于RLC串联谐振曲线特性的再讨论

详析ＲＬＣ串联谐振曲线特性，并指出个别文献对该曲线画法上的不妥     

HCMOS器件的γ辐射效应

本文介绍HCMOS器件的γ辐射损伤和退火效应的结果。HCMOS器件的静态功耗电流和动态特性对剂量十分灵敏,它们的退火效应也很明显。     

阿尔芬波加热研究的进展

本文概述了阿尔芬波加热的理论和实验情况。讨论了阿尔芬波加热的基本物理问题,并介绍了某些重要的实验结果。对在大托卡马克上采用阿尔芬波加热的可能性进行了全面论述。     

一个新的IEC61000-4-2标准ESD电流解析表达式

 分析了两个ESD标准电流波形表达式，并提出一个新的基于脉冲函数来描述ESD标准电流的解析表达式，该表达式符合最新的标准IEC61000-4-2，在零时刻的电流及其微分部为0，且波形与实际测量波形基本吻合。