体育教师专业化发展的思考

笔者阐述了教师"专业化"的理念及其专业内涵,分析了新形式下体育教师专业化发展过程中的几个问题及具体 要求。     

孔子在中国古典文献学史上的地位和作用

孔子最早把“文”与“献”连用取证;开创整理古典文献之先河;创立整理古典文献的方法和传统。本文从宏观上对孔子古典文献工作的方法和经验加以总结和概述,使之理论化、系统化,这本身也是我们图书馆员批判继承和整理利用中国古典文献工作的重要任务。     

中国科学院国家科学图书馆“学科馆员”的学科化服务

从宣传推广资源与服务、资源保障与信息需求分析、个性化信息服务、学科情报研究以及建立学科馆员支撑平台等方面对学科馆员的学科化服务进行探讨，并提出一些思考和建议，以期更好地推动中国科学院国家科学图书馆学科馆员的学科化服务工作。     

网络中的“议程设置”与公众自我议程设置

在网络传播模式下,"议程设置"仍然存在,但由于传受关系发生了很大变化,出现议题设置权下放,传播内容多元化等新特点,同时,网络中也出现了公众自我议程设置,并为传统媒体设置议程的现象。     

清代云南临沧地区的学校教育

清代,临沧地区的教育获得了前所未有的发展,统治阶级在这一地区大力兴办书院、义学,培养了很多人才,推动了本地教育和文化的发展,为本地教育的近现代化奠定了基础。     

基于角度分析法的城市空间可达性研究

本文首先介绍了量化分析空间系统的角度分析法,并利用最小角度路径和角度偏离值等度量概念,去衡量开放空间中两点间的可达性。其次,本文仿照空间句法中的"轴线法",提出了"中心轴线法",用中心轴线的角度变化去代表空间的角度转动情况。最后,本文给出了轴线和空间的角度偏离值,用于对独立空间进行可达性分析,并且给出角度偏离矩阵等概念,用于表示整个研究空间的可达性情况。     

生态技术创新视角下工业产业的种群效应实证研究

以2001~2011年江西省的工业产业为样本,采用生态技术创新种群行为模型对种群效应进行实证分析,发现多数种群的个体数量已经逼近或超过区域创新资源决定的生态阈值,种群内部、种群之间由协同效应转向竞争效应,发出了环境过载的警示。     

基于多频互控分析的记发器信令生成器的工程设计实现

1号信令是电话接续的重要信令,作为1号信令重要组成部分的记发器信令的生成与检测一般都是由专用芯片实现。由于硬件接口和功能固定,在实际使用中往往受到很大限制,因此用通用芯片来实现这一功能可以大大增加灵活性,兼容性。但在软硬件设计之前,准确分析记发器信令的信号波形特性十分重要,往往会决定最终的设计性能指标。首先分析记发器信令的具体物理特性,其具体实验数据取自于满足1号信令协议标准的相关设备,然后分析记发器信号的多频互控流程,包括编码序号和频率成分的对应关系、信号的具体分类、信号的发送流程等,这对于建立从协议层到物理层的相关机制都是十分有意义的。最后给出工程设计的基本思路,包括从ARM+DSP的架构设计、逻辑层次设计、相互之间的接口关系、配合机制等。     

Electroosmotic flow hysteresis for dissimilar ionic solutions

Electroosmotic flow (EOF) with two or more fluids is commonly encountered in various microfluidics applications. However, no investigation has hitherto been conducted to investigate the hysteretic or flow direction-dependent behavior during the displacement flow of solutions with dissimilar ionic species. In this investigation, electroosmotic displacement flow involving dissimilar ionic solutions was studied experimentally through a current monitoring method and numerically through finite element simulations. The flow hysteresis can be characterized by the turning and displacement times; turning time refers to the abrupt gradient change of current-time curve while displacement time is the time for one solution to completely displace the other solution. Both experimental and simulation results illustrate that the turning and displacement times for a particular solution pair can be directional-dependent, indicating that the flow conditions in the microchannel are not the same in the two different flow directions. The mechanics of EOF hysteresis was elucidated through the theoretical model which includes the ionic mobility of each species, a major governing parameter. Two distinct mechanics have been identified as the causes for the EOF hysteresis involving dissimilar ionic solutions: the widening/sharpening effect of interfacial region between the two solutions and the difference in ion concentration distributions (and thus average zeta potentials) in different flow directions. The outcome of this investigation contributes to the fundamental understanding of flow behavior in microfluidic systems involving solution pair with dissimilar ionic species.     

Numerical simulation on the opto-electro-kinetic patterning for rapid concentration of particles in a microchannel

This paper presents a mathematical model for laser-induced rapid electro-kinetic patterning (REP) to elucidate the mechanism for concentrating particles in a microchannel non-destructively and non-invasively. COMSOL^®(v4.2a) multiphysics software was used to examine the effect of a variety of parameters on the focusing performance of the REP. A mathematical model of the REP was developed based on the AC electrothermal flow (ACET) equations, the dielectrophoresis (DEP) equation, the energy balance equation, the Navier-Stokes equation, and the concentration-distribution equation. The medium was assumed to be a diluted solute, and different electric potentials and laser illumination were applied to the desired place. Gold (Au) electrodes were used at the top and bottom of a microchannel. For model validation, the simulation results were compared with the experimental data. The results revealed the formation of a toroidal microvortex via the ACET effect, which was generated due to laser illumination and joule-heating in the area of interest. In addition, under some conditions, such as the frequency of AC, the DEP velocity, and the particle size, the ACET force enhances and compresses resulting in the concentration of particles. The conditions of the DEP velocity and the ACET velocity are presented in detail with a comparison of the experimental results.