我国计算机科学研究队伍低龄化表现的数量特征

对《计算机研究与发展》、《软件学报》和《计算机学报》所记录的5024个作者年龄数据进行了科学计量学分析,发现了我国计算机科学研究队伍低龄化表现的三个数量特征：青年峰突兀老年峰平缓的双峰年龄分布;青年作者比例增大与第一作者平均年龄逐年降低的趋势;第一作者低龄化及各序位作者平均年龄依次后移而递增的合作模式。     

论李煜以物喻愁词在北宋词家中的回响

李煜善于运用＂春水＂、＂春草＂等意象比况家国之愁,离别之恨,感人至深。北宋词坛的一些大家如欧阳修、柳永、秦观等人曾沿用其以＂水＂、＂草＂等物象喻愁绪,在继承的基础上别有新创,并各具意境。李煜对北宋词的影响,不但体现在具体词句的创作上,还体现在对词的意境的营造方面,以真情写真景,自成高格。     

近五年来国内外索引研究的进展与趋势

为了深入了解国内外在索引领域的研究进展,本文应用文献计量法和内容分析法,对2005-2009年间国内外研究索引的文献进行统计分析,包括期刊分布、作者分布、主题分布三个方面,总结当前国内外索引研究的热点,并预测未来研究中的发展趋势。结果表明,国外索引领域的核心期刊已基本形成,而国内索引领域的核心期刊群尚未稳定;国内外目前都尚未形成稳定的核心作者群;在研究热点方面,国内外情况有所差异,但发展趋势趋于一致。     

论贵州苗族作家的民族志书写

在贵州高原上土生土长的苗族作家万胜昌、欧阳克俭、李文明、李再春等在田野调查的基础上以民族志的方式呈现苗族社会奇特的社会文化现象,用富于民族色彩的叙事来探寻根本性的个性文学表述.由于他们的民族志书写以深入的观察和切身的体验为基础,因而他们的作品自始至终流贯着强烈的民族尊严感、认同感和忧患意识.     

城市公共空间的功能意义研究——基于加拿大原住民人口城市迁移视角

在多种因素的作用下,加拿大原住民人口的城市迁移趋势越来越明显,不仅为原住民人口的城市迁移提出了新课题,也给城市原住民社区的服务及管理带来了挑战。在对现阶段加拿大原住民人口城市迁移主要原因的分析基础上,对作为公共空间的加拿大城市原住民中心的服务对象及其服务功能展开了研究,并对新形势下如何帮助城市原住民人口适应新环境并尽快融入到城市社区生活等一系列问题进行了重点探讨。最后指出加拿大城市原住民中心可为我国少数民族城市流动人口公共空间构建及其社会管理工作创新提供重要的经验借鉴作用。     

增强服务意识,构建稳定的作者队伍

质量是学报的生命线,构建一支稳定的高层次的作者队伍,是学报可持续发展的基石。通过对学报现状的分析,提出了构建作者队伍的设想和措施,强调了学报编辑要增强服务意识,要尊重、关爱作者,为学报的可持续发展创造良好的条件。     

关于作者署名中共同责任者的思考

科技期刊论文作者署名中共同第一作者、共同通信作者的方式日益增多,学术界对此尚无明确界定;与此同时,该现象还引发了科研成果归属问题等矛盾。针对此种情况,在进行调研的基础上,提出应规范科技期刊第一作者和通信作者署名的建议,即尽量避免共同责任人,科技期刊应重视论文责任人的重要性,预防学术腐败的发生。     

高校学报编辑增强与作者对话有效性的着力点

高校学报编辑与作者对话是推进稿件运转的关键环节。文章从编辑的角度探讨高校学报编辑与作者对话的有效性,强调编辑与作者对话前应熟知文稿内容,及时查阅资料,弥补知识缺漏;尽可能多地了解作者的背景信息,确定对话内容的重点、详略;与任何作者对话,语气皆宜谦和委婉;提出的书面意见具有不可变更性,务必准确、稳妥、清晰且理据充分。     

Impulsive control for passivity and exponential synchronization of coupled neural networks with multiple weights

This paper investigates the passivity and synchronization problems for two classes of multiple weighted coupled neural networks (MWCNNs) with or without time delays. Firstly, by utilizing an impulsive control strategy and some inequality techniques, several passivity criteria for MWCNNs with diverse dimensions of output and input are established. Then, based on the Lyapunov functional, some sufficient conditions to ensure the synchronization of MWCNNs via impulsive control are derived. In addition, combined with the comparison principle and the impulsive delay differential inequality, the global exponential synchronization of MWCNNs with time-varying delays is considered under impulsive control. Finally, two numerical examples illustrate the effectiveness of the obtained results.     

Fractional order sliding mode control of a pneumatic position servo system

Gas flow has fractional order dynamics; therefore, it is reasonable to assume that the pneumatic systems with a proportional valve to regulate gas flow have fractional order dynamics as well. There is a hypothesis that the fractional order control has better control performance for this inherent fractional order system, although the model used for fractional controller design is integer order. To test this hypothesis, a fractional order sliding mode controller is proposed to control the pneumatic position servo system, which is based on the exponential reaching law. In this method, the fractional order derivative is introduced into the sliding mode surface. The stability of the controller is proven using Lyapunov theorem. Since the pressure sensor is not required, the control system configuration is simple and inexpensive. The experimental results presented indicate the proposed method has better control performance than the fractional order proportional integral derivative (FPID) controller and some conventional integral order control methods. Points to be noticed here are that the fractional order sliding mode control is superior to the integral order sliding mode counterpart, and the FPID is superior to the corresponding integral order PID, both with optimal parameters. Among all the methods compared, the proposed method achieves the highest tracking accuracy. Moreover, the proposed controller has less chattering in the manipulated variable, the energy consumption of the controller is therefore substantially reduced.