对称积分区域上的重积分

得出了二、三重积分的积分区域分别关于任意直线对称、任意平面对称的结论,推广了之前的这一问题。     

基于校企合作的高职院校专兼结构“双师型”团队建设研究

以校企合作为依托,探索建立专兼结构"双师型"团队的体制机制,是高职院教师队伍建设与发展的重要途径与方式。既体现高职教育方向和特色,又创新高职院校师资工作的理论和实践。     

电流滞环跟踪PWM控制的双闭环调速系统仿真

电流滞环跟踪PWM控制技术能较好地得到三相对称正弦波电流,以电流滞环跟踪PWM控制器为内环,转速外环调节器选用PI调节器,建立异步电动机双闭环调速系统.建立系统主电路及控制电路进行仿真模型,主电路由异步电动机模块、电动机测量单元模块、逆变器模块、直流电源、负载模块等组成,控制电路由转速给定信号、转速调节器、电流给定信号及电流滞环跟踪控制器等组成.仿真得到电流、转速及电磁转矩曲线,验证了方法的有效性.     

校企“专业双带头人”模式下高职院校“专业双带头人”队伍建设

校企“专业双带头人”模式更加符合“双师结构”教学团队的要求,适应了高职院校专业带头人队伍建设的需要,是对“专业带头人”制度的创新。,高职院校不仅要选好专业带头人队伍,更要重点培养和建设,精心打造好这支队伍。在建设目标上要着眼于大局,培养方式上要多元化,重视科学地考核和评价,且在机制上要创新。     

探地雷达在水电工程超埋深隧洞预报高压水的应用研究

提前预知隧道施工前方的地质条件将为施工单位安排组织施工提供有力的保障,探地雷达在隧洞超前预报工作中的应用,具有方便、快速、分辨率高等优点。就目前超前预报中存在的问题,提出了一些解决办法。对探测方法作了一些改进,并对解释理论作了一些初步的研究,结合工程实例,通过实践验证了理论的可行性。     

Simulation, experimentation, and collaborative analysis of adjacent heat exchange modules in a vehicular cooling system

A cooling system consisting of several heat exchange modules is a necessary part of an automobile, and its performance has a direct effect on a vehicle’s energy consumption. Heat exchangers, such as a charged air cooler (CAC), radiator, oil cooler, or condenser have different structures and can be arranged in various orders, and each combination may produce different effects because of interactions among them. In this study, we aimed to explore the principles governing interactions among adjacent heat exchangers in a cooling system, using numerical simulation and experimental technology. 3D models with different combinations were developed, compared, and analyzed comprehensively. A wind tunnel test platform was constructed to validate the computational results. We found that the heat dissipation of the modules was affected slightly by their relative position (the rules basically comply with the field synergy principle), but was independent of the modules’ spacing within a certain distance range. The heat dissipation of one module could be effectively improved by restructuring, but with a penalty of higher resistance. However, the negative effect on the downstream module was much less than expected. The results indicated that the intensity of heat transfer depends not only on the average temperature difference between cold and hot mediums, but also on the temperature distribution.     

TBM construction process simulation and performance optimization

Long tunnel excavation with tunnel boring ily affected by uncertainties and needs to be adjusted machine （TBM） is a complex and stochastic process. It is eas- according to specific geological conditions in different tunnel sections, which makes the construction scheduling and management difficult. Based on the rock mass classification, this paper estimates the penetration rate. Using the rate, a cyclic network simulation （CYCLONE） model of TBM boring system is established, and the advance rates under different geological conditions are determined. Then, the impact of different cutter head thrust, which is chosen in reasonable range according to previous experiences, on pro- ject schedule is analyzed. Moreover, the simulation model of mucking system is built to determine the number of muck trains and rail intersections reasonably, regarding the efficiency of muck loading and material transporting. Based on the interaction and interrelation between TBM boring system and mucking system, the combined CY- CLONE model for the entire tunneling process is established. Then reasonable construction schedule, the utilization rate of working resources, and the probability of project completion are obtained through the model programming. At last, a project application shows the feasibility of the presented method.     

热气候风洞实验台环境测控系统动态工况误差分析与不确定度评定

探讨了热气候风洞实验台环境测控系统动态工况的误差,对系统各环境参数(温度、湿度、辐射照度和风速)的测量不确定度进行评定。通过分析影响系统控制不稳定的因素,找出其规律性,并给出改善建议。     

基于ADF4157的小数频率合成器设计

介绍了由锁相技术的芯片ADF4157研制小数分频频率合成器的原理和设计方法.单片机AT89C51作为外围电路,解决了频率合成器中大的鉴相频率与小的频率间隔之间的矛盾,电路简单实用.仿真数据结果表明,不恶化相位噪声,环路开环增益与相位裕量比较好,频率分辨率有了提高.     

培养外语拔尖国际化人才初探——双超常教育与积极心理健康教育并举

培养外语拔尖国际化人才是重点高等外语院校的时代使命。历史经验教训表明,培养拔尖人才一是要有先进理念和捷径,一是要塑造积极的心态。为此,本文提出：（1）“超常潜能超常发挥”的双超常教育,为外语拔尖国际化人才学业有成提供先进理念和科学途径;（2）奠基幸福有成人生的积极心理健康教育,为外语拔尖国际化人才心理成长保驾护航。