应用能力培养在电子专业英语教学中的研究与实践

通过分析电子信息专业外语在教学过程中存在的问题,结合自身教学经验对专业英语教学改革模式进行探讨和实践,提出一种实用的教学模式,更进一步提高学生对专业英语技能的培养。     

基于电子商务平台的电子完税系统

本文介绍了在山东省国税系统全面推行的电子完税系统,文章从系统的概要设计、详细设计、数据库设计出发,详细论述了该系统的主要思想和开发过程。最后总结了系统的主要特点。     

电子设备产品的可靠性试验

可靠性试验是可靠性工程最基本的内容和最重要的工作项目。本文对电子设备产品可靠性试验的技术基础、可靠性试验的特点和分类、电子设备产品可靠性试验的方案设计,以及可靠性试验数据的分析和处理方法作了一些介绍。     

混合微电路在军事/宇航电子装备中的应用

主要阐述了混合微电路在军事及宇航电子装备中的技术优势及各种应用实例。     

简谈静电对电子产品的影响及防护

介绍了静电影响电子产品质量的几种主要途径以及一些静电防护方法。     

片式多层陶瓷电容器全自动薄膜丝印机的研制

针对目前片式多层陶瓷电容器生产工艺的主要特点,提出了一种适用于Roll to Roll制造工艺的全自动薄膜丝印机,并从工作原理及系统构成、丝印原理、薄膜载体的输送运动、干燥原理、电气控制系统等方面进行了研究与开发,达到了实际生产的要求。     

Joining and package technology for 175 °C Tj increasing reliability in automotive applications

For the task of improving the reliability and robustness of power electronic semiconductor devices, the main focus is on packaging and joining technology. The improvement is made necessary by various applications which require higher active and passive temperature cycles capability. For example: Automotive applications require a minimum life time of 15 years, wind power 25 and traction applications, 30–40 years and longer.Furthermore, higher reliability is demanded of new semiconductor technology, because maximum junction temperatures will, sooner or later, exceed currently recognized limits.In the near future, silicon devices will reach a maximum junction temperature of up to 200 °C. And the new wideband-gap devices have the potential to exceed even this limit. That is why a new package and joining technology is mandatory.There are new developments in the pipeline:For the die contact, planar wire technology and copper based bond wires can be expected in the long term.This new technology is based on new material science and printed circuit board process techniques.As a robust joining method, sinter or diffusion solder will be in use soon.But on the semiconductor module level, further action can be taken now, or in the near future, to increase reliability significantly.This paper presents improvements, based on material science, which are already available and can be used now, or in the near future.     

电子商务教学与实验网络平台的构建

电子商务教学与实验网络平台由虚拟个人学习室、教室、电子商务实验室、考场、讨论室、管理室组成.定义网络学习平台的组成单元、功能结构和基本模块及模块公共接口后,用模块封装并存于模块库.在低层框架上构建应用逻辑层,并用元数据文件描述模块功能.用户只要给出接口和功能描述,应用逻辑将在模块库中自动选择适合功能的模块并通过具体机制实现其功能.     

Electronic structure,chemical bonding and optical properties of Di-2-pyrymidonium dichloride diiodide (C4H5ClIN2O) from first-principles

The electronic structure and electronic charge density of the monoclinic phase Di-2-pyrymidonium dichloride-di-iodide compound is studied by using the local density approximation (LDA) and Engel Vosko generalized gradient approximation (EVGGA). Using LDA for exchange correlation potential, we have optimized the atomic positions taken from the X-ray crystallographic data by minimization of the forces acting on the atoms. From the relaxed geometry the electronic structure, electronic charge density and the optical properties were determined. Band structures disclose that this compound has indirect energy band gap. The obtained energy band gap value using EVGGA (2.010 eV) is larger than that obtained within LDA (1.781 eV). To envision the chemical bonding nature between the composition of the investigated compound, the distribution of charge density was discussed in the (−1 0 1) crystallographic plane. The contour plot shows partial ionic and strong covalent bonding between C–O, N–C and C–H atoms. The optical properties of Di-2-pyrymidonium dichloride-di-iodide are obtained by the calculation of the dielectric function.     

High Temperature Superconducting Magnetic Energy Storage and Its Power Control Technology

High temperature superconducting （HTS） power inductor and its control technology have been studied and analyzed in the paper. Based on the results of simulations and practical experiments, a controlled release scheme has been proposed and verified for developing a practical HTS SMES prototype.