A decentralized control method for frequency restoration and accurate reactive power sharing in islanded microgrids

To achieve the frequency restoration (FR) and accurate reactive power sharing (RPS) in islanded microgrids (MGs), an improved P-f droop control is proposed. Firstly, the inverter impedance, whose value is set by the virtual impedance method, is used to minimize the impact of line resistance on powers coupling and RPS. Then, in order to restore the frequency of distributed generations (DGs) to the rated value, the reference is changed for compensating the frequency deviation (FD) caused by loads change. And the fast FR rate is achieved under a large constant k. Besides, in order to eliminate the inaccuracy of RPS caused by voltages difference (VD), the line voltage drop (LVD) is used to compensate the voltage droop characteristics. The use of voltage feedback ensures that the obtained voltage is desired after the LVD compensation. Finally, the simulation in RT-LAB indicates the effectiveness of proposed method in an islanded MG model.     

2008年《怀化学院学报》载文、著者及引文统计分析

运用文献计量学的方法,对2008年《怀化学院学报》的载文、著者及引文情况进行了统计分析,为该刊及同类刊物今后的发展提供了依据和参考。     

2000～2005年《青岛职业技术学院学报》载文及作者统计分析

运用文献计量学的统计方法，对2000-2005年出版的《青岛职业技术学院学报》（2000-2002年原刊名为《青岛教育学院学报》）从学报的载文量及篇密度，作者年龄、职称、性别，作者地域分布，载文分类比较等方面进行统计，分析该刊6年来的发文特点及载文作者的总体状况，以期为学报今后的发展找出方向。     

“I own it,don’t I?” The Rules of Academic Copyright Ownership and You

Abstract

This article delves into a few areas of copyright law that academic authors often overlook: joint author’s rights and the work made for hire doctrine. Scholarly publications produced by university professors often include more than one author. The default copyright laws apply to any such works if there is no specific written agreement to the contrary. Thus, it is important to understand what those default rules are in order to determine whether it is appropriate to deviate from them in an author agreement. Similarly, the work made for hire doctrine would normally apply to make all work produced by professors owned by the university. Luckily, many universities do not wish to own such work and give it back to professors through university statutes and other governing documents. However, it is crucial to understand whether the default rules apply or the university permits professors to negotiate their own author agreements with publishers. Finally, if authors own their own scholarly works, publishers can expect that they will negotiate their rights in the publishing agreements to benefit the terms most favorable to the author. And yet, many faculty members simply sign a standard authorship agreement without asking for concessions on the part of the publisher. Thus, this article empowers professors to exercise their copyright rights to the full extent of the law and to negotiate their author’s agreements to benefit themselves and society as a whole through open access and the use of Creative Commons licenses.     

Case Study

Although the concept of browsing rooms or enrichment collections is not a new one in academic libraries, there is very little recent literature regarding the nature of such collections and a dearth of literature addressing thc importance of collection development policies for such collections. This paper describes the development of a collection development policy for a specific university library enrichment collection and discusses guidelines and procedures developed to complement and implement the policy.     

推进我国医学期刊稿约的规范化

将11种国内中文医学期刊与10种SCI收录的国外优秀期刊的稿约进行对比,分析其异同。结果显示:10种国外期刊稿约的信息量均较大,条款较多,各项条款的叙述详尽;而11种中文期刊中,部分期刊稿约过于简单,缺项较多。认为需要向国外优秀期刊学习,补充完善稿约,从而推进我国医学期刊稿约的规范化。     

科技期刊编辑应善于发掘作者的潜力

从传递交流信息、选择挖掘作者、文稿选题、科研设计、文稿处理、发表后的后续工作等方面论述发掘作者潜力的方式、方法与途径.认为编辑可以而且应该去发掘作者的潜力,这对科技期刊本身、作者、社会都有益处.     

高校期刊编辑与研究生作者之间的三重关系分析

高校期刊拥有众多的研究生作者群体,研究生作者投稿量逐年增多。论述高校期刊编辑与研究生作者之间的三重关系:编辑与研究生作者之间是编者与作者的关系,也是老师和学生的关系,更是平等友好的互动互惠合作关系。正确处理和运用好二者的关系对办好高校期刊和培育研究生作者快速成才具有重大意义。     

Individual and field citation distributions in 29 broad scientific fields

Using an initial dataset consisting of 18.5 million distinct authors and 15 million distinct articles published in the period 2000–2016, which are classified into 29 broad scientific fields, we search for regularities at the individual level for very productive authors with citation distributions of a certain size, and for the existence of a macro-micro relationship between the skewness of a scientific field citation distribution and the characteristics of the individual citation distributions of the authors belonging to the field. Our main results are the following three. Firstly, although the skewness of individual citation distributions varies greatly within each field, their average skewness is of a similar order of magnitude in all fields. Secondly, as in the previous literature, field citation distributions are highly skewed and the degree of skewness is very similar across fields. Thirdly, the skewness of field citation distributions is essentially explained in terms of the average skewness of individual authors, as well as individuals’ differences in mean citation rates and the number of publications per author. These results have important conceptual and practical consequences: to understand the skewness of field citation distributions at any aggregate level we must simply explain the skewness of the individual citation distributions of their very productive authors.     

语言的起源和作家的偏爱

语言的起源问题对人类有着不可思议的诱惑力，研究文学语言必须研究人类语言起源的情形。该文首先将眼光投射于语言的起源，论述了人类最初的语言产生的时间、条件、动机以及人类最初的语言从何而来等问题，着重说明了语言起源于艺术．进而揭示作家特别青睐语言起源于艺术的根本原因在于人类最初的语言能把人的情感、心胸、血肉、生命等等赤裸裸地表现出来，从而使文学符合文学的实际．接近于文学本体。