农业科学类期刊高被引论文分析及启示

为明确农业科学类研究热点,深入分析我国农业科学类期刊高被引论文的特征,借助中国科学文献计量指标数据库(CSCD-ESI)的统计基线指标,以2007-2017年105种农业科学类核心期刊的2520篇高被引论文为研究对象,分别从其发表年份、被引频次、作者来源地区、机构、学科、基金资助情况等方面进行分析和比较.结果表明,2007、2008、2010年的高被引论文数量和总被引频次较高;北京市、江苏省、陕西省及中国农业大学、西北农林科技大学、南京农业大学等高等院校是高被引论文产出的主力军;科技部其他基金、国家自然科学基金及省市基金是高被引论文的主要基金来源;《农业工程学报》《中国农业科学》《作物学报》3刊的高被引论文数量占总量的42.14％;农业基础科学、农作物、农业工程、园艺、林业方面的高被引论文最多,合计占比达71.75％;在17篇被引频次100次以上的高被引论文中,有8篇综述性论文,占47.06％;说明我国农业科学类期刊的高被引论文的地区机构分布和学科分布均较为集中,小部分优质期刊是高被引论文的主要载体,编辑应加强对相关作者群体、学科内容的关注,加强组稿、约稿和优质稿源的拓展工作.     

On the time-varying Halanay inequality with applications to stability analysis of time-delay systems

The main results of the paper are improvements on the stability analysis of Halanay inequalities with time-varying coefficients in both continuous-time and discrete-time setting. Three classes of improved conditions are established to ensure that the solution to the Halanay inequality is uniformly exponentially stable. The merit of the proposed new conditions is that the coefficients of the Halanay inequality can be unbounded and sign indefinite. This is achieved by using the notion and properties of uniformly asymptotic stable (UAS) functions. Based on the improved stability conditions for the Halanay inequality and the Lyapunov Razumikhin approach, three classes of sufficient conditions are established for testing the stability of time-varying time-delay systems. Finally, the advantages of the proposed methods are illustrated by some numerical examples with some of them borrowed from the literature.     

网络舆情危机的概念辨析及指标设定

针对学界对网络舆情危机概念研究模糊不清的现状,本文在总结与探讨舆情、网络舆情的概念的基础上,从公共危机管理的角度,提炼出网络舆情危机的概念,并指出网络舆情危机具有不确定性、破坏性、紧迫性、连带性、相对性和波及面广等特点,初步建立了网络舆情危机预警的指标体系,为网络舆情危机的研究提供理论支持.     

我国咨询产业人才培养模式的分析研究

本文介绍了国外咨询人才培养情况,分析我国咨询人员现状及存在的不足,从咨询人才培养环境、咨询人才培养机制、咨询人才引进机制这3个方面提出我国咨询人才培养模式,希望能够优化我国咨询产业咨询人才队伍建设.     

Visually constructing the chemical structure of a single molecule by scanning Raman picoscopy

The strong spatial confinement of a nanocavity plasmonic field has made it possible to visualize the inner structure of a single molecule and even to distinguish its vibrational modes in real space. With such ever-improved spatial resolution, it is anticipated that full vibrational imaging of a molecule could be achieved to reveal molecular structural details. Here we demonstrate full Raman images of individual vibrational modes at the ångström level for a single Mg-porphine molecule, revealing distinct characteristics of each vibrational mode in real space. Furthermore, by exploiting the underlying interference effect and Raman fingerprint database, we propose a new methodology for structural determination, which we have called ‘scanning Raman picoscopy’, to show how such ultrahigh-resolution spectromicroscopic vibrational images can be used to visually assemble the chemical structure of a single molecule through a simple Lego-like building process.     

CiteSpace软件应用研究的回顾与展望

CiteSpace信息可视化软件工具是由华人学者陈超美博士于2004年开发的,凭借其强大和先进的功能,该软件在国内外得到了广泛的应用和关注。国外对该软件的应用主要分布在信息科学、生命科学等领域,国内则主要应用于管理学和技术科学领域。从应用领域来看,主要包括图书情报学、管理学、科技政策、教育学以及具体的技术科学(纳米科学与技术、能源技术、新材料技术、电子信息技术等);从使用功能来看,主要是基于知识图谱的研究前沿与研究热点分析,科学计量学与引文分析,关键词共词网络分析,作者共被引与作者合作网络分析等。最后,针对当前的应用状况,本文对CiteSpace的应用前景和趋势进行了分析和展望。     

A hydrodynamic focusing microchannel based on micro-weir shear lift force

A novel microflow cytometer is proposed in which the particles are focused in the horizontal and vertical directions by means of the Saffman shear lift force generated within a micro-weir microchannel. The proposed device is fabricated on stress-relieved glass substrates and is characterized both numerically and experimentally using fluorescent particles with diameters of 5 μm and 10 μm, respectively. The numerical results show that the micro-weir structures confine the particle stream to the center of the microchannel without the need for a shear flow. Moreover, the experimental results show that the particles emerging from the micro-weir microchannel pass through the detection region in a one-by-one fashion. The focusing effect of the micro-weir microchannel is quantified by computing the normalized variance of the optical detection signal intensity. It is shown that the focusing performance of the micro-weir structure is equal to 99.76% and 99.57% for the 5-μm and 10-μm beads, respectively. Overall, the results presented in this study confirm that the proposed microcytometer enables the reliable sorting and counting of particles with different diameters.     

基于信息资源优化配置理论的信息共享策略研究

介绍信息资源优化配置理论,分析信息资源共享基础和发展战略,指出我国图书馆信息资源共享存在传统观念束缚、共享系统缺乏统一有效操作、资金经费投入不足、面临知识产权纠纷和信息安全等问题.提出提高认识、转变观念、开展图书馆信息共享创新服务,构建图书馆信息集群,构建多元化资金保障体系,加强图书馆信息共享系统的网络安全保障等对策.     

知识溢出与集群创新绩效:竞争程度调节效应

文章以集群企业间竞争程度为调节变量,以创新协同效应和创新抑制效应为中介变量剖析了知识溢出对集群创新的影响机理。通过数理分析和实证检验得到如下结论:一方面知识溢出促进了集群的创新协同从而对创新具有正效应,另一方面知识溢出具有创新抑制效应从而对集群创新具有负效应,集群企业间竞争程度负向调节了知识溢出的创新协同效应,正向调节了知识溢出的创新抑制效应。     

提高科技查新质量的方法研究

阐述了科技查新的定义,分析了科技查新工作存在的主要问题,提出了提高科技查新质量的方法。