开关磁阻调速电动机混沌反控制的研究

针对开关磁阻调速电动机存在转矩脉动大、电磁干扰严重的问题,提出了一种利用混沌函数调节电压占空比对SRD实施混沌反控制的方法。该方法通过对SRD理想电感方程进行傅立叶变换,建立了SRD仿真模型,然后以逻辑斯蒂映射方程调节SRD占空比增量,得到了SRD混沌反控制系统的混沌态,并将该方法与模糊控制算法相结合进行实验验证,解决了单一混沌反控制方法调速性能差的问题,且实现了混沌信息向SRD的嵌入。实验结果表明,混沌态运行可以在一定程度上改善系统的性能。     

重庆三峡库区发展游艇经济的可行性研究

分析了重庆三峡库区具有的资源优势和基础设施条件及发展游艇经济的综合效益,认为在三峡库区发展内陆游艇经济是可行的,也是必要的.提出了在三峡库区发展游艇经济的基本思路.     

Recovery of indium and lead from lead bullion

Lead and indium were recovered by electrolysis and nonequilibrium solvent extraction process from lead bullion.The effects of current density,electrolytic period and circle amnant of electrolyte on the electrochemical dissolution of lead and indium were investigated.The effects of extraction phase ratio and mixing time on solvent extraction of indium and striping phase ratio and stripping stage on the loaded organic phase stripping were also investigated.The experimental results indicate that under optimum conditions,the purity of lead deposited on cathode is 98.5% and the deposit rate of lead is 99.9%,the dissolution rate of indium is 94.28%,the extraction rate of indium is 98.69%,the stripping rate of indium is almost 100%,and the impurity elements,such as Zn,Fe and Sn can be removed.     

Leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system

The leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system was studied. The effects of ore particle size,reaction temperature and the sum concentration of ammonium ion and ammonia on the leaching efficiency of zinc were examined.The leaching kinetics of low-grade zinc oxide ore in NH3-NH4Cl-H2O system follows the kinetic law of shrinking-core model. The results show that diffusion through the inert particle pores is the leaching kinetics rate controlling step. The calculated apparent activation energy of the process is about 7.057kJ/mol. The leaching efficiency of zinc is 92.1% under the conditions of ore particle size of 69μm, holding at 80℃ for 60min, sum ammonia concentration of 7.5mol/L, the molar ratio of ammonium to ammonia being 2:1, and the ratio (g/mL) of solid to liquid being 1:10.     

Leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system

The leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system was studied. The effects of ore particle size, reaction temperature and the sum concentration of ammonium ion and ammonia on the leaching efficiency of zinc were examined. The leaching kinetics of low-grade zinc oxide ore in NH3-NH4Cl-H2O system follows the kinetic law of shrinking-core model. The results show that diffusion through the inert particle pores is the leaching kinetics rate controlling step. The calculated apparent activation energy of the process is about 7.057 kJ/mol. The leaching efficiency of zinc is 92.1% under the conditions of ore particle size of 69μm, holding at 80℃ for 60 min, sum ammonia concentration of 7.5 mol/L, the molar ratio of ammonium to ammonia being 2：1, and the ratio （g/mL） of solid to liquid being 1：10.     

女大学生青春期性教育管理与反思

当代大学生中出现的各类青春期问题已成为令人担忧的教育和社会问题,引起了社会的广泛关注。本文以女大学生为调查对象,以青春期性教育为突破口,通过问卷调查、小型座谈等方式,研究女大学生青春期性教育的现状及存在的问题,并力求找出相应的解决方法。     

武汉城市圈高校教育资源共享机制的构建

武汉城市圈内高校教育资源十分丰富但分布极不平衡。为提高教育资源的使用效益,促进城市圈高校教育的一体化发展,必须以科学发展观为理论指导,从转变观念、创新体制和完善机制等方面构建武汉城市圈高等学校教育资源共享的平台,以便更好地发挥高等教育在推进武汉城市圈＂两型社会＂建设中的＂动力站＂和＂加速器＂作用。     

浅议高校公共舞蹈教学与大学生艺术素质教育

高等教育必须改革人才培养模式,注重培养一专多能高素质的人才。艺术教育是素质教育的重要组成部分,而舞蹈在艺术教育中有其不可替代的位置。在高校开设舞蹈教育对发展学生的德育、智育、体育等各方面都有非常直接而明显的作用。但是,多年以来,我国高等学校未把舞蹈教育纳入普通教育系列,只是在单纯专业化道路上向前发展,这不能不说是我国艺术教育的一种缺憾,所以,我们应该要摆正位置,谋求最佳发展渠道,使学生的个性得到发展,特长得到发挥,而这正是素质教育所要求的。     

双功能模板法合成多级孔沸石分子筛的研究进展

简要介绍了广泛应用于石油化工和工业催化中的沸石分子筛的特点以及多级孔沸石分子筛的基本合成策略,包括“自上而下”和“自下而上”两类合成策略;重点介绍了近年来发展出来的新型双功能模板法合成策略,包括如何利用季铵基团表面活性剂双功能模板,特别是利用聚合物双功能模板来直接合成不同拓扑结构的多级孔沸石分子筛的最新研究进展,以及两类双功能模板合成多级孔沸石的特点和优点。最后,对多级孔沸石分子筛在合成条件优化、模板剂选择、合成机理探究等方面所面临的挑战和在工业催化实际条件下的稳定性应用前景进行了展望。     

基于改进卷积双向门控循环网络的轴承故障诊断

针对传统深度学习方法没有充分利用轴承信号的时序特点,以及难以处理动态数据的问题,提出一种基于改进卷积双向门控循环神经网络的轴承故障智能诊断方法。采用卷积神经网络从输入信号中提取代表性特征,引入双向门控循环神经网络挖掘故障数据在时间维度上的语义信息,通过注意力机制自适应地对特征图通道赋予不同权值,从而实现高精度的轴承故障诊断。在公开轴承数据集上进行实验,实验结果表明,该方法能够正确地将轴承故障分类,分类精度可达996%。