一个代数不等式的再研究

《数学通报》2004年第4期刊登的1485号问题是：设xk〉0,k=1,2…n,p∈R,q〉0,且令∑k=1^n xk=s,Sk = pxk ＋ q（ s - xk）,     

浅谈鱼类天然雌核发育

雌核发育是单性鱼类的一种生殖方式,本文简要介绍天然雌核发育鱼类的种类、染色体组成、卵子发生、受精生物学和天然雌核发育的应用。     

蜱虫简介

本文简要介绍了蜱虫的形态与分布、生活史、生态与习性、传播途径、与疾病的关系、蜱虫叮咬的临床特点、蜱虫引起的传染病的防治原则及最新研究进展。     

实现权力与观念的共筹——对华尔兹与温特体系理论的比较研究

由于体系主要包括单元、结构和进程三个方面,所以文章主要围绕这三个方面对华尔兹的结构现实主义体系理论和温特的建构主义体系理论进行比较分析。通过比较分析可见,二者的理论在解释国际政治的永恒主题——冲突与合作或战争与和平方面,由于偏执于权力或观念的一方而利弊兼有。因此,在解释国家行为及国际政治现象时,应当避免两种理论各自所具有的缺陷,拓宽看问题的视角,实现权力与观念的共筹。     

Development of integrated precision vibration-assisted micro-engraving system

A novel precision vibration-assisted micro-engraving system was developed by the integration of fast tool servo and ultrasonic elliptical vibration system, in which the flexure hinge was designed to avoid backlash and PID control algorithm was established to guarantee specific precision. Apart from experimental validation of the performance of the system, various micro-V-grooves cutting experiments on aluminum alloy, ferrous material and hard cutting material were performed, in which Kistler force sensor was used to measure cutting force. Through experiments, it was clear that the vibration-assisted micro-engraving system can ensure good quality of micro-V-grooves and reduce cutting force by about 60% compared with traditional removal process without ultrasonic vibration.     

Experimental and FEM Study of Coated and Uncoated Tools Used for Dry Milling of Compacted Graphite Cast Iron

Compacted graphite cast iron (CGI) has been the material for high-power diesel engines recently, but its increased strength causes poor machinability. In this study, coated and uncoated carbide tools were used in dry milling experiment and FEM simulation to study the machinability of CGI and wear behaviour of tools. The experimental and FEM simulation results show that coated tool has great advantage in dry milling of CGI. SEM and EDS analysis of tool wear indicate the wear morphology and wear mechanism. Adhesive wear is the main mechanism to cause un-coated tool wear, while abrasive wear and delamination wear are the main mechanism to cause coated tool wear. Stress and temperature distribution in FEM simulation help to understand the wear mechanism including the reason for coating peeled off.     

科研融入实践教学与大学生创新能力培养

结合指导教师的科研项目,培养研究生和本科生在科研理念引导下,通过"脉冲激光沉积InGaZnO薄膜制备"的实践过程,使学生在毕业设计的有限时间内利用实验室的科研设备,完成InGaZnO靶材制备,在非晶材料上的脉冲激光沉积薄膜,并对制备出的靶材和薄膜的形貌结构、XRD、PL等光谱的检测。通过透明氧化物半导体薄膜制备的实践锻炼,使学生经历了知识、能力、科研素质和创新能力的培养,同时探索在实践教学和科研中如何发挥学生的创新意识和独立从事科研的能力。     

校企联合认证实训对JAVA实验教学的启示

针对"JAVA程序设计"实验教学中存在的问题,结合校企联合的NIEH认证实训特点,通过对比分析提出了3点建议。     

电子信息类专业操作系统实验课程的设计和实践

在电子信息专业的操作系统课程实验教学中提出并实践了一系列教改措施.编写了具有电子信息类特色的实验教材;突出了“原理—实例一实践”的具有专业特色的课堂教学与实验教学相结合新模式;实验内容具有信息与通信工程专业、电子科学技术、自动化专业和信息安全专业的特色.实践了“突出重点—因材施教—重点研讨—评析总结”4个环节构成的新型实验教学方法.     

基于Flex技术的虚拟演示实验系统

富客户端技术(RIA)的成熟技术之一———Flex技术应用在虚拟实验系统改变了以往的B/S模式,客户端通过Remote Object远程方法,调用Data Management Services以及Message Services同J2EE服务器集成在一起。应用Flex技术对大学物理虚拟演示实验的设计开发,实现了全新页面无刷新技术、改进了实验系统界面以及交互方式,给学习者带来了良好的体验,提升了学习效果。