重庆菜园坝大桥缆索吊机电气控制设计

介绍了PLC在重庆菜园坝大桥缆索吊机电气控制设计中的应用，提出了在设计中应引起注意的几个问题。     

汽车电器虚拟试验模型设计

本文分析了汽车电器试验的特点,介绍了基于Flash设计汽车电器虚拟试验模型的思路,举例介绍了利用Flash MX 2004制作蓄电池充电试验互动动画的思路和过程。使耗时蓄电池充电试验变得快速、简单而且直观。     

汽车电气故障智能诊断专家系统的研究与开发

介绍汽车电气故障诊断仪器现状及智能故障诊断专家系统的结构和组成,建立汽车电气故障智能诊断专家系统的知识库管理系统以及推理模块的构成和故障诊断专家系统。     

Testing results analysis of contact materials’electrical contact performance

Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.     

Voidage measurement based on genetic algorithm and electrical capacitance tomography

INTRODUCTION Two-phase flow exists widely in chemical, pe- troleum and metallurgical industries. The voidage is one of the most important parameters of two-phase flow because the measurement of the voidage is im- portant for safety, environmental protection, energy conservation and quality assurance in industry (Hewitt, 1978; Lin, 1992). Although many voidage measurement methods have been proposed, it is still difficult to measure the voidage due to the complexity of the characteristics o…     

电工技术实训课程改革研究

分析了工科人才培养的社会需求,指出在我校应用性人才培养的背景下,进行电工技术及实验课程模式改革的必要性。提出电工实训课程改革方案并在教学中付诸实施,实施结果表明：该课程改革方案是可行的,具备推广到其他实践课程的价值。     

建筑绝热复合材料连接器的探讨

建筑材料正在逐步使用制式的建筑绝热系统,文章调研了一种新型建筑绝热系统复合材料连接器,探讨了复合材料连接器的技术改进措施：可以考虑采用真空灌注成型、间歇式生产的方法和采用真空辅助成型和拉挤成型相结合的方式,进行二次成型的方法改进连接器的制作技术,并对需要克服的技术难题进行了分析.     

Acute passive stretching in a previously fatigued muscle: Electrical and mechanical response during tetanic stimulation

Abstract

The aim of this study was to assess the effects of acute passive stretching on the electrical and mechanical response of a previously fatigued muscle. Eleven participants underwent maximal tetanic stimulations (50 Hz) of the medial gastrocnemius, before and after a fatiguing protocol and after a bout of passive stretching of the fatigued muscle. During contraction, surface electromyography (EMG), mechanomyography (MMG), and force were recorded. The following parameters were calculated: (1) the EMG root mean square (RMS), mean frequency, and fibre conduction velocity; (2) MMG peak-to-peak and RMS; (3) the peak force, contraction time, half-relaxation time, peak rate of force development (dF/dt) and its acceleration (d² F/dt ²). Fatigue reduced peak force by 18% (P < 0.05) and affected the other force, EMG, and MMG parameters. After stretching: (1) all EMG parameters recovered to pre-fatigue values; (2) MMG peak-to-peak remained depressed, while RMS recovered to pre-fatigue values; (3) the peak force, peak rate of force development and its acceleration were further reduced by 22, 18, and 51%, respectively, and half-relaxation time by 40% (P < 0.05). In conclusion, acute passive stretching, when applied to a previously fatigued muscle, further depresses the maximum force-generating capacity. Although stretching does not alter the electrical parameters of the fatigued muscle, it does affect the mechanical behaviour of the muscle–tendon unit.     

高职高专《电工电子操作技能项目化实训教程》教材建设研究

教材是教师传授知识的载体,是学生学习知识的依据。高质量教材是培养高素质技能型人才的基本保证。《电工电子操作技能项目化实训教程》采用工作过程导向的项目化教材编写思路,在企业调研、工作任务分析、典型工作任务归纳的基础上,选择企业真实工作任务作为教材编写项目,同时融入＂电工操作证考试＂和＂初级电子仪器仪表装配工技能考核＂职业技能鉴定标准,使教材内容与职业资格证书制度有效衔接。     

“汽车电器与电子设备”课程教学改革尝试

高职"汽车电器与电子设备"课程采用传统的教学内容和方法已跟不上汽车电器技术的发展需要。因此,应选择符合时代要求的教学内容,改革教学方法,注重对学生能力的培养,加强实践教学,改革考核方式,以培养符合时代要求的高技能高职汽车电器人才。