Direct Intermediate Regulation Enabled by Sulfur Containers in Working Lithium–Sulfur Batteries

Polysulfide intermediates (PSs), the liquid-phase species of active materials in lithium–sulfur (Li-S) batteries, connect the electrochemical reactions between insulative solid sulfur and lithium sulfide and are key to full exertion of the high-energy-density Li-S system. Herein, the concept of sulfur container additives is proposed for the direct modification on the PSs species. By reversible storage and release of the sulfur species, the container molecule converts small PSs into large organosulfur species. The prototype di(tri)sulfide-polyethylene glycol sulfur container is highly efficient in the reversible PS transformation to multiply affect electrochemical behaviors of sulfur cathodes in terms of liquid-species clustering, reaction kinetics, and solid deposition. The stability and capacity of Li-S cells was thereby enhanced. The sulfur container is a strategy to directly modify PSs, enlightening the precise regulation on Li-S batteries and multi-phase electrochemical systems.     

Temperature effects on surface activity and application in oxidation of toluene derivatives of CTAB-SDS with KMnO4

The γ_cmc values of CTAB-SDS decrease from 63.67 mN/m at 10‡C to 36.38 mN/m at 90‡C, slightly lower than those of either CTAB or SDS. Correspondingly, the CMC of CTAB-SDS decreases almost by half. The increase of surface activity of CTAB-SDS can be attributed to the relatively weak electrostatic interaction at high temperature, which is supported by the increase of solubility of CTAB-SDS with rise in temperature. Catalytic effect on oxidation of toluene derivatives with potassium permanganate follows the order CTAB-SDS > SDS > CTAB. This is not caused by the dissociative effect of CTAB-SDS with low surface activity at low temperature, as seen from the fact that almost all oxidative products can be retrieved for different toluene derivatives and surfactants by mimicking the conditions of reaction. In the emulsifications of toluene derivatives at 90‡C, the time that turbid water layers of surfactant solutions take to become clear is the same as that of the catalytic effect on oxidation of toluene derivatives. Thus, it can be inferred that surfactants can improve the oxidation yields of toluene derivatives by increasing the contact between two reacting phases.     

建构高职毕业生质量评价体系的方式

通过构建高职毕业生质量评价体系，对毕业生质量进行评价，可以了解到毕业生在工作中的表现、取得的成绩、存在的问题，以及用人单位对毕业生质量的满意程度等，以便为高职院校的教育改革提供信息，最终保证并促进高职毕业生整体质量的提高。     

基于B/S模式的水利水电工程造价管理系统研究

提出了基于B／S模式的水利水电工程造价管理系统，对B／S的体系结构、系统的总体结构设计、功能及功能设计进行了阐述，并说明了系统实现的关键技术．     

尾水管水力振动的监测与故障判断

从模型及真机试验结果出发，叙述混流式水轮机一般的水力故障形式，研究了尾水管的水力振动特点及振动随运行工况而变化的情况，介绍了以压力脉动频率及幅值作为特征参量对尾水管进行振动监测及故障判断的方法。     

集成电路设计产业产品创新趋势研究——国际片上系统（SOC）IP核发展现状及对策分析

基于国际集成电路设计产业的分析，系统阐述了国际SOCIP核的发展状况，指出SOC设计将是集成电路设计企业技术创新的发展方向。提出了一些国际SOCIP核发展的对策，包括口核标准化、SOC技术平台开发及加强与Foundry的合作。     

浅谈体育教育专业学生试教的指导

“试教”是从学生到教师进行角色转换的必修课 .本文从实践中提炼出试教的指导方法 ,旨在为教师在试教过程中有针对性地指导学生提供帮助 ,从而达到提高学生教学能力的目的 ,使学生从心理、教学能力等诸方面顺利完成从学生到教师的角色过渡 .     

论会计模拟实验的建立与发展

现行的会计实验教学环节不能满足新形势下会计专业培养目标的要求,建立和发展会计模拟实验是当务之急。     

Earthquake Resistant Engineering and Application of Seismic Zonation Map of China

China is a country with high seismieity. It is very important for industry and structure to fortify against earthquakes. In this paper the outline of seismicity in China, the criteria for fortification against earthquakes and the contents of seismic zonation map of China are described. The contents of seismic safety evaluation for major construction projects, such as large dams, large bridges, long distance pipe lines for transporting oil and natural gas, nuclear plants, petrochemical enterprises and so on, are presented. Some geological disasters caused by destructive earthquake, such as earthquake-caused collapse and landslide, liquefaction of saturated soll and earthquake fault and so on, are also presented. Preventive countermeasures for these disasters are discussed.     

数项级数审敛的思路与技巧

本文通过典型例题的求解与评析,探讨了级数敛散性的解题思路与技巧,对学生判定数项级数敛散时经常出现的错误与问题,提出了具有针对性的解决方法。