LOGO!在教学楼电气系统控制中的应用

本文介绍了采用LOGO!代替继电器开关量控制，实现对教学楼电气系统中的插座、室内照明、走廊照明及电铃电路的自动与手动控制；并通过内部软件线路图分析，阐明LOGO!在时钟开关量控制中的优势。     

高等教育规模扩展的预测模型与宏观调控的对策建议

文章应用实证分析的方法,选取高等教育毛入学率作为衡量我国高等教育规模的主要指标;根据非线性分析方法,提出了对我国高等教育规模扩展预测的Logistic模型以及宏观调控的对策建议。预测分析的结果表明,该预测模型及宏观调控的对策建议能够为我国高等教育规模的持续扩展提供有力的决策支持。     

Gelation Mechanism of Erythromycin Ethylsuccinate During Crystallization

In this paper, the gelation mechanism of erythromycin ethylsuccinate(EES) during crystallization is investigated for the first time. The generated semisolid gel-like phase exhibited a 3D fibrillar network morphology and the typical rheological properties of gels. The fibers inside the gel-like phase were confirmed to be new types of EES solvates using powder X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry, and gas chromatography. The gelation and crystallization regions in EES-1-propanol solid–liquid phase diagram were determined. Analyses of solvent parameters showed that moderate solvent polarity may promote EES gelation. Fourier transform infrared spectra, nuclear magnetic resonance spectra, and scanning electron microscopy analyses indicated that through intermolecular hydrogen bonds, EES and solvent molecules assembled into fibers via crystallographic mismatch branching growth. The fibers intertwined into a 3D network microstructure and formed a gel-like phase, completely immobilizing the solution.     

以文字为失去的土地招魂 --萧红之于东北作家群的意义

萧红作为东北作家群当中的女性创作主体,对她的批评往往被湮没在群体当中,忽视其个案的倾向。其实,萧红的创作更多的是以文字的方式,从文化层面,民间层面,女性视角层面为失去的土地招魂,以留存深刻、鲜活、完整的东北。     

电流变液阻尼器的研究与设计

研究用于数控机床实时减振系统所需的电流变液阻尼器。从理论方面研究电流变液阻尼器在大冲击下的抗冲击的具体结构和性能，进行了电流变液阻尼器在结构参数方面设计，还根据功率和电压等设计要求，选择了相适应的导电滑环。     

苏东坡贬琼期间书法文化活动考

苏东坡在海南期间，身处困苦的生活环境不悲观失望，以极高的热情投入到诗书创作及教育事业中。对海南的书艺及教育事业产生了深远的影响。     

基于就业能力的高分子材料实验教学改革探索

高分子材料专业旨在培养高分子材料领域的高级工程技术人才,对大学生的就业能力和创新能力都提出了越来越高的要求。本文针对高分子材料专业实验教学中存在的问题,提出了几点改革措施,以期有效提升本科生的就业能力,促进其就业。     

高等教育评估与现代大学建设

在以历史的观点来看待高等教育评估历史的基础上,结合现代大学建设的要求,对世界高等教育质量保障的主要模式及发展趋势进行分析、比较与研究;解决“谁来评”、“评什么”、“如何评”的问题;探索确立和构建重视自评为主、强调简单易行、与高等教育多样化相适应的高等教育质量保障体系。     

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

Cover systems are used to prevent water infiltration into a waste body. They also play an important role in controlling landfill gas transport from the waste body to the atmosphere. It is important to assess the flux of landfill gas at the surface of a cover system by considering the coupled effects of rainwater infiltration and gas transport in the cover soils. We have developed a 1D mathematical model for coupled transient gas and water transport in unsaturated cover soils. The coupled model was solved by the finite element method. Results obtained by the proposed model agreed well with experimental data. Based on the proposed solution, the influences of gas pressure, gas permeability, and the thickness of the cover soils on soil gas concentration profiles were investigated. The difference in soil gas concentration reached up to 31% as the thickness of cover increased from 1 to 2 m. Gas concentration at a depth of 0.2 m decreased by 6% as the amplitude of atmospheric gas pressure fluctuation increased from 20 to 100 Pa. The gas concentration increased by only 3% when gas permeability increased by a factor of 2 for a relatively long period of gas migration (e.g., 60 h) under the given conditions. Results suggest that both diffusion and advection should be considered when estimating gas transport in unsaturated cover soils. The numerical model can be used in the design of cover systems in relation to gas breakthrough time, breakthrough concentration, and flux.     

网络课件架构的选择

随着计算机网络技术的成熟和发展，课件从单机版发展到了网络版，为教学活动提供了一个全新的平台和环境。而网络课件可以基于适用不同教学需求的不同架构，这就将架构选择的问题摆到了网络课件的设计者和使用者面前。本文拟从当前网络教学的实际出发，探讨影响网络课件架构选择的各种因素，以期得到网络教学工作者的指导与帮助，同时也希望引起课件设计人员、教师和学习者的关注和探索。一、网络课件的两种架构基于网络的课件，一般可以分为客户机／服务器（Client／Server，以下简称C／S）和浏览器／服务器（Browser／Server，以下简称…