义务教育学校教师绩效工资政策实施问题探析

我国从2009年1月1日起,实施义务教育学校教师绩效工资政策。调查发现,该项政策在实施过程中存在着执行者未能制定出及时且有效的执行计划和未能建立起相应的监督、检查机制两大问题。这两大问题源于政策目标要求过高,政策内容笼统不具体,教育行政部门监督、检查不力,以及缺乏纠偏机制。进而提出政策执行者应适当调整政策目标、使之与实际情况相吻合,完善政策内容,并在此基础上建立起健全的政策监督、纠偏机制。     

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.     

Improved Parallel Processing Function for High-Performance Large-Scale Astronomical Cross-Matching

Astronomical cross-matching is a basic method for aggregating the observational data of different wavelengths. By data aggregation, the properties of astronomical objects can be understood comprehensively. Aiming at decreasing the time consumed on I/O operations, several improved methods are introduced, including a processing flow based on the boundary growing model, which can reduce the database query operations; a concept of the biggest growing block and its determination which can improve the performance of task partition and resolve data-sparse problem; and a fast bitwise algorithm to compute the index numbers of the neighboring blocks, which is a significant efficiency guarantee. Experiments show that the methods can effectively speed up cross-matching on both sparse datasets and high-density datasets.     

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。     

基于DDS技术的高速等效采样示波器设计

为了更好地实现对高频周期信号的采样,设计了基于DDS技术高速等效采样的数字示波器,以不大于1 MHz的实时采样率实现了最高2.5 GHz的等效采样率。系统电路以CycloneIII FPGA芯片为核心,结合外围器件,完成了测量频率范围10 Hz～15 MHz,输入信号范围2 mV～16 V,水平显示分辨率25点/div,垂直灵敏度包括2 V/div、2 mV/div共10档可调,实时采样与等效采样相结合的数字存储示波器。本设计电路结构简单,以低速AD实现了高速信号的采集,实现方案新颖。     

粒径大小对Washburn法测定润湿性的影响

利用K100表面张力仪接触角测量模块测定了4种煤样在浮选范围内的4个粒级的润湿性,研究了粒径对Washburn法测量结果的影响.当液体对固体的润湿能力很强或者很弱时,粒径的影响很弱可以放宽粒径范围;当颗粒与液体仅有部分亲和能力时,颗粒大小的影响非常显著,此时大颗粒的存在会影响实验结果的准确性.对于不同的液体,粒径大小的影响规律不同,以夹河煤样为例,在水中润湿曲线斜率的大小关系为K0.25 ～0.125＞k0.125～0.074＞K0.5～0.25＞k.074-0.038,在柴油中斜率的大小关系为K0.125-0.074＞K0.25 ～0.125＞k0.5～0.25＞K0.074-0.038,对于其他煤样也有相似的情况,所以不能通过参比液的方法来消除粒径的影响.在常规浮选体系中,一般不能用Washburn法直接测量0.5 mm以下的固体的润湿性,为了提高测量结果的准确度,固体粒径范围最好控制在0.125 mm以下.