Optimization analysis of high temperature heat pump coupling to desiccant wheel air conditioning system

The high temperature heat pump and desiccant wheel(HTHPDW) system can make full use of heat released from the condenser of heat pump for DW regeneration without additional heat. In this study, DW operation in the HTHPDW system was investigated experimentally, and the optimization analysis of HTHPDW system was carried out. The performance of DW had influence on the dehumidification(evaluated by dehumidification and regeneration effectiveness) and cooling load(evaluated by thermal and adiabatic effectiveness). The results show that the enthalpy increase occurred in all the experiments. Compared to the isosteric heat, heat accumulation in the desiccant and matrix material and heat leakage from regeneration side to process side have greater influence on the adiabatic effectiveness. Higher regeneration temperature leads to lower adiabatic effectiveness that increases more cooling load of the system. When the regeneration temperature is 63℃, the maximal dehumidification effectiveness is 35.4% and the satisfied adiabatic effectiveness is 88%, which contributes to the optimal balance between dehumidification and cooling.     

有源电力滤波器的箕舌线变步长LMS谐波检测方法

将单相有源电力滤波器（APF）作为研究对象,对其负载非线性电流中的谐波电流检测方法进行了进一步的研究．基于自适应噪声对消技术,将基于箕舌线的变步长最小均方（LMS）算法应用于APF谐波检测,同时将其与定步长LMS算法、基于s函数的变步长LMS算法,以及目前最常用的谐波检测算法之一的离散傅里叶滑窗谐波检测方法进行仿真比较．通过仿真分析,该算法具有较小的运算量、稳态误差小、强跟踪能力等特点,并有较好的收敛速度,解决了收敛速度和稳态误差之间的矛盾．     

谈大学生思想政治教育的结构优化

优化大学生思想政治教育的系统结构是思想政治教育工作的基本要求。就目前各高校的普遍现状来看,迫切需要加强单项教育和整体教育的统一、阶段性教育和连续性教育的统一、科学文化教育和思想道德教育的统一、理论教育和实践教育的统一、教育目标和考核方法的统一。     

基于粒子滤波的篮球旋转投射最优角度分析研究

为了提高篮球投篮的准确性,提出基于粒子滤波的篮球旋转投射最优角度分析计算方法。构建篮球旋转投射的动力学和运动学模型,结合动态差分模型进行篮球旋转投射的基元轨迹方程建模,采用最大似然估计方法进行篮球旋转投射最优角度的优化计算,并采用自适应的轨迹修正方法进行篮球旋转投射过程中的力学控制,实现篮球旋转投射最优角度分析。仿真结果表明,采用该方法进行篮球旋转投射最优角度计算的准确度较高,运动力学控制能力较好,具有较好的角度修正和轨迹跟踪能力,在篮球旋转投射运动学建模中具有很好的应用价值。     

优化企业集团财务管理的思考

我国企业集团应建立集权为主的财务管理体制,将EVA作为企业集团财务管理目标,通过加强信息和财务组织的控制,建立集权为主的企业财务管理体制,优化企业财务管理．     

自适应粒子群算法在水库优化调度中的应用研究

采用自适应粒子群算法（APSO）对水库优化调度问题进行了研究。建立了问题的数学模型，提出了该算法的工程实现方法，编制了基于Matlab语言的优化计算程序。三插溪水库的仿真实例表明：APSO算法较PSO算法的收敛性能更好，APSO算法在搜索晚期具有更强的局部搜索能力，更容易找到最优解。与遗传算法相比，APSO算法采用的参数少，实现简单，收敛结果更优。可见，APSO算法在水库优化调度问题上的求解是可行有效的。     

基于功效的集成电路延时估算与优化

本文讨论了cmos门电路延时时间的估算模型，介绍了逻辑功效对逻辑门电路的优化方法，在确定的工艺条件下，根据电路要求，可以快速确定最优的逻辑结构和晶体管的尺寸，在集成电路的设计中具有很高的应用价值．     

Kindergarten teachers adjust their teaching practices in accordance with children’s academic pre‐skills

This study examined the extent to which kindergarten children’s academic pre‐skills are associated with their teachers’ subsequent teaching practices. The pre‐skills in reading and math of 1268 children (655 boys, 613 girls) were measured in kindergarten in the fall. A pair of trained observers used the Classroom Assessment Scoring System instrument to observe 49 kindergarten teachers on their emotional support, classroom organisation and instructional support in kindergarten in the spring. The results of the multilevel modelling showed that low levels of academic pre‐skills in kindergarten classrooms in the fall predicted high classroom quality in the classrooms later on. The results suggest that the overall level of children’s academic pre‐skills in the classroom plays an important role in the ways in which teachers adapt their instructional practices to the needs of a particular classroom.     

一种改进的LMS自适应算法研究

传统的LMS算法的精度不高,收敛速度慢,并且跟踪性能不好.本论文主要研究了一种改进型的变步长的LMS自适应算法NLMS,并基于MATLAB仿真软件设计完成了一种改进型的NLMS自适应滤波器,对该算法进行仿真验证.结果表明:该改进型的自适应算法NLMS平均误差更小,精度更高.     

一种并行微粒群的改进算法

在对标准微粒群算法（PSO）分析的基础上,提出了一种并行微粒群算法（PPSO）。文章详细介绍了该并行算法的流程,它改变了原来子种群之间周期性的通讯,而采用即时更新最优值的方法。仿真结果表明,PPSO在收敛速度和达标率方面有显著的优越性。