智能诊断在铁路设备维修体制中的应用

通过对铁路设备维修制度分析，分析了智能诊断在铁路设备维修中应用以及未来发展前景。随着社会不断发展，铁路运输水平不断提升，铁路设备对于保障铁路运输效率有着重要影响。文章针对铁路行业当前发展态势，提出了全新的维修体制，从而进行策略性维修。     

Time-resolved spectroscopy of femtosecond laser-induced Cu plasma with spark discharge

The combination of spark discharge and laser-induced breakdown spectroscopy (LIBS) is called spark discharge assisted LIBS. It works under laser-plasma triggered spark discharge mode, and shows its ability to enhance spectral emission intensity. This work uses a femtosecond laser as the light source, since femtosecond laser has many advantages in laser-induced plasma compared with nanosecond laser, meanwhile, the study on femtosecond LIBS with spark discharge is rare. Time-resolved spectroscopy of spark discharge assisted femtosecond LIBS was investigated under different discharge voltages and laser energies. The results showed that the spectral intensity was significantly enhanced by using spark discharge compared with LIBS alone. And, the spectral emission intensity using spark discharge assisted LIBS increased with the increase in the laser energy. In addition, at low laser energy, there was an obvious delay on the discharge time compared with high laser energy, and the discharge time with positive voltage was different from that with negative voltage.     

内燃机车柴油机连杆螺钉液压式拉伸机设计

内燃机车柴油机连杆螺钉在加工完成后成品交验前,要求进行预拉伸试验,在连杆螺钉拉伸现状调研和先进的拉伸技术分析基础上,综合应用机械设计理论知识,完成以液压系统为动力源的内燃机车柴油机连杆螺钉拉伸机设计。该项设计实现了连杆螺钉拉伸及伸长量的精确控制,是一项实用的新型设计,可在内燃机车制造厂、配件厂及机务检修车间等场合推广使用。     

骨的恶性血管内皮细胞瘤超微结构研究

本文报告3例骨的恶性血管内皮细胞瘤的超微结构。肿瘤为互相无数吻合的血管腔隙,腔壁衬以增生的,异形性的内皮细胞。肿瘤细胞呈芽状增生突向血管腔呈乳头状结构。在肿瘤生长活跃区,细胞聚集成片块状,无腔隙,该处肿瘤细胞间变更为明显。肿瘤细胞核圆形,椭圆形。时有核凹陷使其几成分叶状。核仁极清晰多数目1～4个,并有明显边集现象。胞质内的粗面内质网及Golgi复合体均不发达。线粒体数量多,但其大小,形态各异,表示其有畸变,并可见相当数量的退变线粒体。丰富的游离多聚核糖体满布整个细胞质。而肿瘤细胞最重要的特征是     

智能诊断在铁路设备维修体制中的应用

通过对铁路设备维修制度分析,分析了智能诊断在铁路设备维修中应用以及未来发展前景。随着社会不断发展,铁路运输水平不断提升,铁路设备对于保障铁路运输效率有着重要影响。文章针对铁路行业当前发展态势,提出了全新的维修体制,从而进行策略性维修。