图书馆文献传递服务中的版权问题

文章对图书馆开展文献传递服务中存在的版权问题进行了分析,并从公有领域作品、合理使用、法定许可、公益服务、成立行业版权保护联盟等方面入手,提出了解决文献传递服务中版权问题的对策。     

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.     

从东西部地区差距评价西部大开发战略实施绩效——基于主成份分析法的视角

本文在比较分析1999年西部大开发战略实施以来东西部地区六个方面差异的基础上,通过构建西部大开发绩效评价指标体系,运用主成份分析法,经过量化分析,指出市场政策差异、市场容量差异和市场体制差异是目前造成东西部地区发展差距逐渐扩大的主要因素。因此,缩小地区差距应在国家宏观政策的引导下,以市场为切入点,发挥市场机制在东西部地区资源配置中的基础作用。     

《普通地质学》课程教学内容整体优化的初步思考

＂普通地质学＂课程内容整体优化,对充分发挥教学资源的利用效率以及培养高素质的地学人才有着重要意义。本文在综合前人研究的基础上,分析了普通地质学课程教学存在的问题并提出了一些优化及普通地质学课程教学内容的具体措施。     

反射机制在数据库系统中的应用

本文介绍在数据库应用系统中通过反射机制获取类的域(Field)，和利用映射定义动态生成SQL语句，执行数据库的基本操作，并用C非程序实现了相关验证。     

多媒体环境下的高频电子线路课堂教学探讨

高频电子线路是电子与通信技术专业的一门重要的专业基础课程,同时也是一门理论性、实际性、专业性、实践性很强的课程。随着科学技术的发展,多媒体技术开始逐渐进入高频电子线路课堂教学,极大促进了高频电子线路课堂教学的发展。文章对多媒体环境下高频电子线路课堂教学进行探讨。     

Natural populations of lactic acid bacteria in douchi from Yunnan Province, China

This research was aimed at isolating and identifying the predominant lactic acid bacteria (LAB) in the traditional Chinese salt-fermented soybean food, douchi, from Yunnan, China. The predominant LAB present were isolated and identified by conventional culture-dependent methods combined with molecular biological methods. Two hundred and sixty isolates were obtained from thirty kinds of traditional fermented douchi from six cities and counties in Yunnan, and those strains were divided into twelve groups by their morphological and biochemical characteristics. Based on 16S ribosomal DNA (rDNA) sequencing and analysis, 56 representative strains were identified as belonging to 6 genera and 14 species: Lactobacillus (4 spp.), Weissella (3 spp.), Pediococcus (2 spp.), Staphylococcus (2 spp.), Enterococcus (1 sp.), and Bacillus (2 spp.). The results show that douchi contains a large natural population of LAB of diverse composition from which some strains could be selected as starters for functional fermented foods. This is the first study on the original douchi from Yunnan, and the results suggest that it may be a useful source for the isolation of LAB. This study has also laid a foundation for further research on developing functional douchi products.     

药物小分子与生物大分子相互作用的研究进展

药物小分子与生物大分子相互作用的研究是涉及到化学与生命科学等多个领域的交叉课题。血清蛋白（SA）与脱氧核糖核酸（DNA）是生物体内的重要转运载体和生命物质,对药物在体内的分布、代谢过程起到至关重要的作用。本文以相互作用的分子机制为导向,对药物小分子与生物大分子相互作用的原理和分析方法以及最新进展进行综述,为深入探索生命物质的结构与功能以及开发设计高效低毒的新药提供了理论依据。     

论“90后”的思想特点及其正确引导

随着社会的发展,“90后”逐渐活跃在人们的视野中。了解“90后”的思想特点并对其正确引导,使其成为构建社会主义和谐社会的中坚力量具有重要的意义。本文从“90后”的概念入手,探析“90后”的思想特点及其成因,并针对“90后”的思想特点,提出引导“90后”的思想朝着正确的方向发展的对策。     

《巴黎手稿》的美学思想同德国古典美学的承继关系

《巴黎手稿》中的美学思想与以康德、黑格尔为代表的德国古典美学具有内在的联系，使人性复归，恢复完满的状态，最终实现人类的解放是他们共同关注的主题。马克思第一次把实践放在最重要的位置，实践是审美实现的途径而非根源，将康德、席勒的美学理想付诸实践，这是马克思对美学史的最大贡献。