机械故障监测与诊断技术的研究综述

概述了在机械设备的大型化、连续化、高速化和自动化的发展趋势中,机械故障监测与诊断技术在其设备的安全、可靠、高效运行方面中起到了重要的作用,并综述分析了振动分析方法这一关键技术,阐述了机械故障监测与诊断技术的发展趋势。     

力学教学内容和课程体系改革研究与实践

本文依据《面向21世纪普通物理学教学内容和课程体系改革研究与实践》课题研究方案要求，对力学课程的教学内容，课程体系和教学方法进行了改革研究与实践。     

无创正压通气治疗急性左心衰的临床研究

目的：观察机械通气治疗急性左心衰的疗效。方法：60例急性左心衰患者,随机分为常规治疗组和无创通气组,无创通气组在常规治疗基础上加用机械通气治疗,观察通气前后心率（HR）、呼吸频率（RR）,平均动脉压（MAP）及血气分析（pH、PaO2、SaO2、PaCO2）的变化及临床症状的改善情况。结果：机械通气治疗后,患者呼吸困难明显改善,生命体征很快稳定,血气分析指标明显好转。结论：对各种不同原因引起的急性左心衰,机械通气能及时有效的改善患者的临床症状及低氧血症,是抢救急性左心衰的有效措施。     

Vacuum interrupter, high reliability component of distribution switches, circuit breakers and contactors

The use of vacuum interrupters(VIs)as the current interruption component for switches,circuit breakers,reclosers and contactors operating at distribution voltages has escalated since their introduction in the mid-1950’s.This electrical product has developed a dominating position for switching and protecting distribution circuits.VIs are even being introduced into switching products operating at transmission voltages.Among the reasons for the VI’s popularity are its compactness,its range of application,its low cost,its superb electrical and mechanical life and its ease of application.Its major advantage is its well-established reliability.In this paper we show how this reliability has been achieved by design,by mechanical life testing and by electrical performance testing.We introduce the“sealed for life”concept for the VI’s integrity.We discuss this in terms of what is meant by a practical leak rate for VIs with a life of over 30 years.We show that a simple high voltage withstand test is an easy and effective method for monitoring the long-term vacuum integrity.Finally we evaluate the need for routine inspection of this electrical product when it is used in adverse ambient environments.     

单线双竖井的铁路隧道内列车活塞风的计算方法

针对单线双竖井机械通风的铁路隧道,以流体力学的恒定流理论为计算依据,推导出在隧道内列车活塞风计算方法.     

高职机电一体化专业应用数学课程的整体设计

文章从实用性和发展性出发,结合机电一体化专业的特点,对高职机电一体化专业应用数学的课程目标、内容、考核评价体系进行了整体设计,提出采用适合机电类行业的真实任务的项目式教学模式,运用多种教学方法进行教学,实现导学做用一体化。     

Investigation of the hydro-mechanical behaviour of fouled ballast

In this study, a fouled ballast taken from the site of Sénissiat, France, was investigated. For the hydraulic behaviour, a large-scale cell was developed allowing drainage and evaporation tests to be carried out with monitoring of both suction and volumetric water content at various positions of the sample. It was observed that the hydraulic conductivity of fouled ballast is decreasing with suction increase, as for common unsaturated soils. The effect of fines content was found to be negligible. For the mechanical behaviour, both monotonic and cyclic triaxial tests were carried out using a large-scale triaxial cell. Various water contents were considered. The results were interpreted in terms of shear strength and permanent axial strain. It appeared that the water content is an important factor to be accounted for since any increase of water content or degree of saturation significantly decreases the shear strength and increases the permanent strain. Constitutive modelling has been attempted based on the experimental results. The model in its current state is capable of describing the effects of stress level, cycle number and water content.     

《机械制造工艺学》教学方法改革尝试

针对《机械制造工艺学》的特点,从改革课程教学内容,在教学过程中注重多媒体技术与板书的有机结合,强调学生在教学过程中的主体作用,强化现场教学和改革课程考核方法五个方面探讨了教学方法改革措施,以达到提高教学质量的目的。     

美国加州大学圣地亚哥分校机械专业课程设置及教学特点与人才培养模式的研究

本文介绍了美国加州大学圣地亚哥分校机械专业的课程设置情况,总结了专业课程的教学特点,详细分析了课程设置和教学方法对学生素质和能力的培养,特别是对学生自主学习能力、团队协作精神、创新能力、独立分析问题和解决问题等能力培养的作用,对我国高校的机械人才的培养起到很好的借鉴作用。