仪表板与头部碰撞模拟分析及其工程优化措施

汽车发生正面碰撞或紧急制动时,驾驶员及副驾驶乘员头部易造成严重损伤.为了提高车辆的被动安全性能,参考GB-11552和ECE21相关头部碰撞的标准,首先对仪表板的头部碰撞区域、免检区域和测试区域进行了清晰的划分与试验界定,然后对某具体车型进行了头部碰撞模拟分析,试验测试并提出了优化改善措施.     

S355J2G3低合金钢焊接接头的组织和力学性能

通过拉伸、冲击、弯曲、硬度和金相等试验对S355J2G3低合金钢MAG焊焊接接头的力学性能与显微组织进行了研究。结果表明:采用G38 3G3Si1焊丝对S355J2G3低合金钢进行焊接时,可获得拉伸、弯曲和冲击性能均良好的焊接接头;接头硬度的分布较均匀,最高不大于380HV;焊缝组织为沿柱状晶晶界析出的块状先共析铁素体,晶内为细小密集的针状铁素体和少量珠光体;热影响区组织主要为先共析铁素体、针状铁素体、珠光体和少量的粒状贝氏体;母材为均匀细小分布的铁素体和珠光体。     

Improvement of defibrillators for EMS use: a problem in engineering and medicine

Recent improvement in defibrillators has been limited mostly to decreased size and weight of portable units. An overview of the scientific literature indicates that the main limitation to further improvement in defibrillators is the lack of medical and physiologic information. Technology probably exists to change defibrillators if the manufacturers know what changes would be desirable. Clinical studies are needed for determining (a) more accurate quantitation of electrical dose for human use, (b) the relative effectiveness of different waveforms, (c) the toxicity and damage of electrical shocks to the heart, (d) the effects of drugs upon defibrillation threshold, (e) improvement of defibrillation techniques, (f) optimal placement and size of electrodes, and (g) the effects of cardiac disease on defibrillation threshold. Most of the needed studies are not technically difficult to carry out but they will be moderately expensive. In some cases special equipment may be needed or special techniques may have to be developed. The experimental animal studies appropriate as background for these clinical studies have been completed. With limited resources available, it is important to ask the most important questions first in order to develop improved defibrillation techniques and defibrillators.     

3G在工程监控中的应用

GSM作为GPS定位，监控的信息传输手段，使得GPS技术在近年来得以迅速发展。特别是利用GSM网络捷供的短消息服务（SMS）使GPS数据传输更加方便快捷。作为GPS应用的载体GIS技术以其准确可靠的数据．多样化的信息输出，而为其开拓出广泛的应用空间。这三种技术的结合．加上现代网络技术．能实现对工程数据进行有效的管理，可构建一个精确、实时、廉价的工程监控网络。     

生物非光滑耐磨表面与非光滑耐磨技术在工程中的应用

指出生物非光滑耐磨表面现象的普遍性，对贝壳、牙齿等几种天然生物耐磨表面几何形态特征进行了分析，并介绍了加工耐磨表面的几种技术方法及非光滑耐磨技术在工程中的应用。同时，对非光滑耐磨理论与技术方法中存在的问题及发展趋势进行了分析与展望。