浅谈我校教务管理信息化建设

教学管理信息化是提高教学管理水平的必由之路。为使我校教务管理向“规范化、信息化、网络化”方向发展,必须充分认识教务管理信息化建设的重要性和必要性,不断完善教务管理的信息,以实现教务管理的科学化、规范化。     

用于油中局部放电定位的超声相控接收阵传感器的研究

基于超高频和超声波相控接收阵的局部放电定位法,研制了16×16阵元的相控超声波接收平面阵传感器.使用相控阵理论对该传感器的特性进行了理论分析,模拟实验表明,在变压器中能接收到局部放电产生的超声波频带内,阵元的接收性能是良好的.以触发压电超声波源的电脉冲信号作为时间基准,对单一的和2个同时发射的、用以模拟油中局部放电的压电超声波源进行了定位实验.结果表明,利用该传感器对压电源的定位在传感器正法线处的系统误差小于2%,且能在一次检测中实现多超声波源的定位,故该传感器可以用于变压器中局部放电的定位.     

冷中子源两相氢热虹吸回路流动极限试验研究

针对中国先进研究堆冷中子源两相氢热虹吸回路传递管的流动极限,以R113 为工质进行了垂直管内气液两相逆流流型和液泛发生界限的试验研究.通过可视化试验发现,随着气液两相流量的增加,依次可出现平稳的下降液膜流、入口有液滴夹带的下降液膜流、入口附近局部乳沫流和全管搅拌乳沫流4 种流型.依据不同管径(32、34、45 mm)、不同压力(70~820 kPa)下的液泛试验数据,提出了一个新的预测液泛发生的关联式,并和一些著名的液泛关联式进行了比较,发现试验数据以及新关联式的预测结果和McQuillan修正关联式的预测值最为一致.所提出的关联式适用于闭式系统中具有锐边入口几何结构的垂直管内气液两相逆流液泛的预测.     

扩大养老保险基金来源夯实现行养老保险基础

纵观世界各国的养老金筹集模式有三种类型：现收现付模式、完全积累模式和部分积累模式，三种模式各有所长和不足，目前各国倾向于从第一种模式向第二种模式过渡，主张采用第三种模式。我国现行养老保险制度基本属于第三种模式，但在目前遇到资金来源短缺，而保险金需求量迅速增大的矛盾。急需要扩大现行养老保险制度的覆盖面，扩大养老保险基金的来源渠道。尤其要注重建立个人储蓄养老保险。     

Improvement of different source function expressions in SWAN model for the Bohai Sea

The simulating wave nearshore (SWAN) wave model has been widely used in coastal areas, lakes and estuaries. However, we found a poor agreement between modeling results and measurements in analyzing the chosen four typical cases when we used the default parameters of the source function formulas of the SWAN to make wave simulation for the Bohai Sea. Also, it was found that at the same wind process the simulated results of two wind generation expressions (Komen, Janssen) demonstrated a large difference. Further study showed that the proportionality coefficient α in linear growth term of wave growth source function plays an unperceived role in the process of wave development. Based on experiments and analysis, we thought that the coefficient α should change rather than be a constant. Therefore, the coefficient α changing with the variation of friction velocity U* was introduced into the linear growth term of wave growth source function. Four weather processes were adopted to validate the improvement in the linear growth term. The results from the improved coefficient α agree much better with the measurements than those from the default constant coefficient α. Furthermore, the large differences of results between Komen wind generation expression and Janssen wind generation expression were eliminated. We also experimented with the four weather processes to test the new white-capping mechanisms based on the cumulative steepness method. It was found that the parameters of the new white-capping mechanisms are not suitable for the Bohai Sea, but Alkyon's white-capping mechanisms can be applicable to the Bohai Sea after amendments, demonstrating that this improvement of parameter α can improve the simulated results of the Bohai Sea.     

直角切削工件切削温度的有限元仿真

以传热学为基础，建立切削温度二维瞬态有限元模型。得出剪切热源引起的工件温度分布曲线。用有限元模拟温度分布，为提高零件加工精度提供了依据。     

我国水环境污染物总量控制研究的现状与展望

随着排入水体的污染物的增多和人们生活水平的提高，污染物浓度的控制已难以真正控制水环境污染．于是在水质规划中首先提出了总量控制的方法．总量控制是在污染严重、污染源集中的区域或重点保护的区域范围内，通过有效的措施，把排入这一区域的污染物总量控制在一定的数量之内，使其达到预定环境目标的一种控制手段．本文在分析了我国水环境的基本特征基础之上，阐述了我国水环境污染物总量控制的现状及存在的问题，进而指出我国水环境污染物总量控制的发展方向．     

供方资源选择的模糊综合评判方法研究

用模糊综合评判方法作为项目采购管理中供方资源选择的评价工具，引入模糊综合评判数学模型，结合对IT行业设备制造商的具体考核评分进行评价选择设计，形成一种使用模糊综合评判技术作为项目采购管理中供方资源选择评价工具的方法．该方法综合考虑了供方资源选择中的诸多考核指标，可以作为供方资源选择的一种评价工具．     

Evaluation criteria for gas source rocks of marine carbonate in China

Hydrocarbon generating and expulsion simulation experiments are carried out using samples artifically matched between the acid-dissolved residue of relatively low-maturity limestone and the original sample. This work makes up for the insufficiency of source rock samples with high abundance of organic matters and low maturity in China. The organic carbon content of the 10 prepared samples varies between 0.15% and 0.74%. Pyrolysis data and simulation experiment results of hydrocarbon generating and expulsion, which were obtained by a high-temperature and high-pressure open system, indicate that the lower limit of organic carbon content for marine carbonate rock to generate and expel hydrocarbons is 0.23%—0.31%. In combination with the numerical analysis of organic carbon in marine carbonate rocks from Tarim Basin, Sichuan Basin, Ordos Basin and North China, as well as the contribution of these gas source rocks to the discovered gas pools, we think that the organic carbon criterion for carbonate gas source rocks should be 0.3%.     

Head rotation and sound image localization in the median plane

The effect of head rotation on median plane sound source (or image) localization is studied. It is suggested that, at low frequency, the change of interaural time difference (ITD) caused by head rotation supplies information for determining sound source direction in the median plane. Based on the suggestion, the summed sound image Ioealization equations for multiple loudspeakers arranged in the median plane are derived. Especially, for a pair of loudspeakers arranged front-back symmetrically in the median plane, the localization equations are similar to that of stereophonic sound in horizontal plane. A sound image localization experiment was carried out to prove the theoretical analysis. The results of this paper are not only available to virtual spatial auditory, but also supply a quantitative validation of the hypothesis that head rotation is a cue for sound source localization in the median plane at low frequency.