电路原理课程是电气工程及其自动化等专业的一门重要的大类基础必修课.为了提高电路原理课程教学质量,培养学生的主动学习能力,对微课在电路原理课程教学中的应用进行研究,对电路原理微课的教学内容、教学方法和教学媒体进行设计.电路原理微课通过微信平台得以实施.

合理的知识产权保护对上海自由贸易区的发展至关重要.在对上海自由贸易实验区现存的知识产权问题进行分析基础之上,借鉴国外自由贸易区保护的经验,结合国情,为上海自由贸易实验区的健康良性发展提出对策及建议.

Principle Circuit course is a compulsory course that is heeded by electric major. Based on different teaching content, the teaching method of Principle Circuit course is deeply and thoughtful discussed in the article. The contrast, exploring, practice teaching method, and so on are highlighted out to reach better educate effect.

Principle Circuits course is a compulsory course that is heeded by electric major such as electric engineering and auto-mation. Teaching reform of principle circuits based on teaching content, teaching methods is studied in the paper. In order to reach better educate effect, teaching program must be revised and teaching content should be arranged reasonably. Teaching methods by analogy and interaction based on question and role are proposed.

The course of Signal and Systems is a common core course in related disciplines.The contents of this course are strong theoretical,abstract and complex.Some appropriate teaching methods and scientific and effective teaching means were discussed.The teaching model with "double subject" was suggested in order to stimulate the learning interests of students and improve the teaching effectiveness of this course.

跨国并购作为一项重要的企业活动,近几年在我国愈演愈烈,这种活动对我国经济的发展及国家竞争力有着深远的影响。本文采用双钻石模型,以2006～2009年间中国企业跨国并购中的典型案例为研究对象,分析跨国并购对我国国家竞争力的影响因素。

In view of the current status of security and the present situation of various parameters detecting system in coal mine,a monitoring system based on CAN-bus and WSNs is designed.The sensor node of the system is mainly designed by ATmegal28L SCM and CC2420 chip,and the Sink node is designed with CAN controller MCP2515,and system hardware and software are designed.Experimental results show that the safety monitoring system has feasibility and high reliability.

针对闭合条件下地面三维激光扫描点云配准产生的闭合差,基于测量平差理论,提出一种闭合差分配方法.首先通过间接平差理论求出各相邻测站间的坐标转换参数及其精度,再对闭合差按与方差成正比分配给各测站.通过多站点云配准实验,验证了该方法能在一定程度上提高点云配准的精度.

The reason that existing mine HV explosion-proof switches fail to operate or operate incorrectly which are influenced by stray interference signal is analyzed in this paper.Then improved Fourier algorithm which can realize filtering decaying DC component is derived.It puts forward time-sharing amplitude AC cable monitor wire protection principle with the terminal connected to a resistor based on this algorithm.It's proved by theoretical analysis,experiment and operation that this method is preferable to filter DC and decaying DC signal and stray current of frequency division,power frequency and high-frequency,especially can absolutely filter interference signal of the same frequency with additional AC.This method supplies new thoughts to improve the precision of monitor wire protection.

互动式教学法是针对传统教学所提出的现代化教学方法,互动式教学以"教师为主导"和"学生为主体"为基本特征。"电机与拖动"课程是电气类专业的一门重要的专业基础必修课。为了提高教学质量和效果,对"电机与拖动"课程的互动式教学进行了探讨,提出了问题互动、角色互动和"多媒体"互动等多种互动方式,在教学实践中取得了较好的效果。

"电机与拖动"课程是工业电气自动化等专业的一门重要的专业基础必修课。采用启发式教学是提高教学质量和效果的行之有效的途径之一。基于不同的教学内容和目的,对"电机与拖动"课程的启发式教学进行了探讨,提出了问题启发、比较启发和直观演示启发等多种方式,教学实践中取得了较好的教学效果。

This article studies the principle of GPS single point positioning,method and some key techniques in data processing.Then,the influences of broadcast ephemeris and precise ephemeris(IGR、IGU and IGF) provided currently by international GNSS service to single point positioning are analyzed.Through experimental data analysis,we can draw a conclusion that the rapid ephemeris can replace the final ephemeris in quasi-real-time high precision solution.

Coordinate transformation is important in surveying work.The paper discusses the disadvantages of the Bursa model,and then introduces a two-step coordinate transformation method that choose a suitable projection plane and central meridian,establishes a pre-tronsformation based on Bursa model,and converts the coordinates by transformation model of plane coordinates.Through a practical example,the conclusion is obtained,with less common points,we can have high precision converted measurements using the two-step method.

由于煤矿高压电网中性点接地方式的改变,造成井下高压防爆开关的漏电保护在应用中存在不少误动和拒动现象,详细分析了漏电故障时各开关所测零序分量的特征和造成原有漏电保护不准确的原因。提出了根据中性点接地方式的不同采用分类漏电保护的新方法,该方法构成的高压综合保护装置通过实验和运行表明,提高了漏电保护动作的准确性。

This paper analyzes heat accumulation-emission of asynchronous motor,then establishes a dynamic mathematical model by discrete Fourier transform. It can reflect dynamic changes of motor thermal accurately and continuously,so as to prevent thermal rising too high felicitously. Compared with traditional inverse-time protection,the model can reflect heat accumulation caused by load changes more accurately and more acutely. An intelligentized protector using ARM IPC2131 is designed based on the model. A long time on-site operation proves its feasibility.

Ill-conditioned problems are common in measurement data processing with many kinds of solutions.Iteration method is one of them.The paper discusses the property of ill-conditioned matrix,and then introduces an algorithm based on iteration method by correcting characteristic value.An example shows that the algorithm is effective,it can improve the iteration speed and have practical significance.

Electric machinery drive course is a compulsory course for electronic engineering major.Comparative teaching method is used for getting better teaching effect and quality.Based on different teaching content and aim,the comparative teaching method of electric machinery drive course is deeply and thoughtful discussed in the article.The sequence,antitheses and classifying comparative teaching method,and so on are highlighted out to reach better educate effect.

We introduce the operating procedure and data processing cycle of APPS,and analyzed the positioning accuracy of the APPS.The results showed that the APPS can provide precise positioning services for GPS users.

"Electric machinery drive" course is a compulsory course for electronic engineering major. Based on different teaching content ,the teaching method of "electric machinery drive" course is deeply and thoughtful discussed in the article. The audio-visual instruction,contrast,inductive teaching method ,and so on are highlighted out to reach better educate effect.

Introducing the EDA technology into the teaching for electrical engineering is the effective method.All of the circuits of the electrical engineering courses can be performed by the simulation of EDA technology.The article introduces some examples of introducing the EDA technology into the experiment of electrical engineering.This can enhance the learning interests of students,and gradually cultivate the ability of researching and solving problems under the condition of keeping the facilities safe.