郑重声明

现在使用MF蓄电池的越来越多。由于这种蓄电池改进了极板板栅合金和隔膜，在充电过程中，能够有效地实现循环生水，所以蓄电池制造商都宣称使用这种蓄电池用不着加水维护。由于在现实使用过程中，各厂家的充电调节控制装置参数不尽相同，充电电压高低不一，甚至有少数车种的充电调节装置根本起不到稳压作用，高电压，大电流，必然会导致水分的蒸发，加速MF蓄电池的损坏，严重的可使蓄电池膨胀（俗称“鼓包“）。     

高速动车组半主动悬挂系统的研究

对高速动车组半主动悬挂系统进行研究,完成了半主动悬挂系统的理论分析、系统设计、控制策略设计、半主动减振器和控制器工程化样机的研制及系统的台架动力学性能试验等工作.台架试验采用实测不平顺轨道谱,对比了不同速度下半主动正常和半主动失效工况下车体的动力学性能指标,试验结果表明,研制成功的半主动悬挂系统能较有效地改善高速动车组车体的横向动力学性能.     

城市轨道交通CBTC区域控制中心子系统的研究

TYJL-ZC1型区域控制中心系统是自主研发的新一代城轨交通列车控制子系统。ZC系统与自动列车监督系统(ATS)、车载控制系统(ATP/ATO)、计算机联锁系统等共同构成完整的基于通信的列车自动控制系统(CBTC)。全文重点描述了区域控制中心系统的主要功能、硬件结构、软件架构以及技术特点等。     

Apoptosis of motor neurons in the spinal cord after ischemia reperfusion injury delayed paraplegia in rabbits

Objective To clarify the pathologic change of the motor neuron on spinal cord ischemia reperfusion injury delayed paraplegia. Methods The infrarenal aorta of White New Zealand rabbits （n=24） was occluded for 26 minutes using two bulldog clamps. Rabbits were killed after 8, 24, 72, or 168 hours （n=6 per group）, respectively. The clamps was placed but never clamped in sham-operated rabbits （n=24）. The lumbar segment of the spinal cord （L5 to L7） was used for morphological studies, including hematoxylin and eosin staining, the expression of bcl-2 and bax proteins in spinal cord was detected with immunohistochemistry. The apoptotic neurons in spinal cord were measured with terminal deoxynucleotidyl transferase mediated dUTP-biotin nick end-labeling of DNA fragments （TUNEL） staining. Results Delayed paraplegia occurred in all rabbits of ischemia reperfusion group at 16-24 hours, but not in sham groups. Motor neurons were selectively lost at 7 days after transient ischemia. After ischemia, the positive expression of bcl-2 protein were in the sham controls but decreased significantly as compared with that of the IR group （P〈0.01）, especially in 72 hours reperfusion. The positive expression of bax protein were also in the sham controls, but increased in the IR group, especially in 72 hours reperfusion; In addition, TUNEL study demonstrated that no cells were positively labeled until 24 hours after ischemia, but nuclei of some motor neurons were positively labeled at peak after ischemia reperfusion at 72 hours. Oenclusion Spinal cord ischemia in rabbits induces morphological and biochemical changes suggestive of apoptosis. These data raise the possibility that apoptosis contributes to neuronal cell death after spinal cord ischemia reperfnsion.     

肋拱支墩辐射式钢管支架对称现浇施工工艺

介绍了悬链线无铰拱对称现浇施工过程，支墩辐射式脚手钢管结构的设计与布设，辐射支墩基础的设计和施工，拱肋龙骨槽钢的安装以及拱肋砼分块分缝浇筑的顺序。     

国产动车组新颖架车机

基于动车组的检修需要开发动车组架车机。介绍了DYT型移动式架车机和DDT型地坑式架车机的设计思想和创新结构,并通过了CRH1、CRH2、CRH3和CRH5 4种型号动车组检修的试验验证。指出这种新颖架车机具有良好的兼容性,也可用于地铁车辆的架车作业。     

列车运行三维动态视景仿真

列车运行的三维视景仿真可在设计阶段把新车外观和内饰展现给用户,并为线路规划、列车运行调度等提供依据。对列车运行视景仿真方案进行分析的基础上,建立了地形地貌、轨道、建筑物及车辆的三维视景模型。从提高动态仿真效率和渲染速度的角度出发,采用基于图形与图像的混合建模方法和LOD与纹理映射技术,实现了列车运行的三维动态视景仿真,达到具有较高逼真度的视景效果。     

中国人的F1之梦 专访方程式车手——朱戴维

在上海站F1比赛的前夕,记者找到了朱戴维,这个刚年满18岁的中国方程式车手,已经逐渐显现出承载中国人F1梦想的希望,朱戴维比去年显得更加沉稳,在卡丁车训练场上,他更多的时候是在思索,头脑中除了如何战胜别人,还有超越自我,达成梦想的宏大志向。