初探钻杆接头损坏的原因

钻杆接头的优化处理需要从很多方面进行考虑,这就要求在材料和热处理方面必须进行严格的规定。这样才能保证接头的韧性和强度要求,达到延长寿命的要求。本文结合钻杆接头的损坏原因作了一些分析,提出了相应的处理方法,并对钻杆接头进行优化设计,来达到增加钻杆疲劳寿命的的目的。     

掩护支架采煤法伤亡事故分析与防治

通过对掩护支架采煤工作面发生事故的分析，论述了事故发生的原因，及可能发生事故区域的划分，并提出了防范措施。     

大型屋面板裂缝的产生及预防

分析了G410大型屋面板裂缝产生的原因及防治办法。     

水泥混凝土路面板开裂原因及设计建议

针对重庆地区普遍存在的水泥混凝土路面板开裂现象,分析了荷载、温度、路面板板长、板胀缝等因素对路面板开裂的影响,提出了相应的设计建议。     

关于试验中“发动机转速提升困难”的故障检查

在新车试验开发阶段,车辆的很多硬件和软件都是新状态的,其可靠性都需要在试验中来验证,所以难免在试验中出现各种疑难杂症。当这些问题出现的时候,往往相应的诊断软件还未开发出来而无法用诊断仪读取故障码,很多时候只能靠试验人员的经验来进行排查。本文以五菱宏光/五菱宏光S/五菱荣光S系列车型为基础,通过对车辆在试验开发过程中遇到的关于引起“发动机转速无法提升”的常见的几种原因进行分析排查,希望对大家在以后的工作和生活中处理类似问题时能够提供参考。     

学生解题无思路的原因及对策

本文针对目前高校学生解题无思路的现状，分析造成这种现状的原因，并在此基础上提出解决问题的措施。     

Impact of speed change on estimated journey time: Failure of drivers to appreciate relevance of initial speed

Higher speeds are associated with increases in the probability of crashing and the severity of the outcome. Logically drivers speed to save time, and research evidence supports this assertion. It is therefore important to investigate drivers’ understanding of how speed change impacts on journey time. Since it is likely that drivers do not appreciate the reciprocal nature of the function which links these two variables, and its implications, two predictions can be made: the impact of a speed change will be underestimated at low speeds and overestimated at high speeds. This issue was addressed through four questions generated by manipulating Speed Change (increase versus decrease) and Starting Speed (30 mph versus 60 mph) with the participants being asked how they felt these variables would impact on journey time. These were included in a large survey addressing speed-related issues. Participants were a representative quota sample of 1005 UK drivers, interviewed by questionnaire. The findings indicated that three of the four questions produced results consistent with the predictions made. Furthermore, a repeated measures factorial ANOVA indicated that there was no real appreciation of how starting speed impacted on journey time. A disordinal interaction provided evidence that drivers wrongly believed that as starting speed increased the impact of a speed rise also increased; the opposite is true. For speed decreases, drivers appeared to think that starting speed had little impact on the amount of time saved. It is recommended that these findings be integrated into driver training and speed awareness courses.     

沥青路面产生不平整的原因及处理措施

路面平整度关系到行车的安全及舒适程度,同时也反映了施工单位的技术水平。随着高等级公路的迅速发展,对于路面平整度要求越来越高。近年来,太原市市政工程总公司施工的沥青路面工程,不同程度的出现了路面不平整现象,本文对沥青路面产生不平整的原因进行了分析,并提出了对策。     

黑龙江垦区水土流失成因与治理对策

本文运用大量调研资料 ,介绍了黑龙江垦区水土流失现状及危害 ,分析了水土流失类型及产生原因 ,并依据实施可持续发展战略提出治理对策     

锅炉省煤器爆漏原因分析及预防

针对锅炉省煤器爆漏的主要原因进行了分析，并提出了相应的预防措施。