某轮柴油主机气缸套活塞环损伤机理探讨

通过对损伤的活塞环断口进行扫描电镜观察和能谱仪分析,并对其燃油进行化验,在此基础上,探讨了气缸套、活塞环产生过度磨损及活塞环折断的机理.     

通过观察机油压力表判断润滑系故障

发动机工作时，机油压力一般保持在150～350千帕的范围内。若机油压力表指示的压力值小于98千帕，则可视为机油压力过低，应立即停车进行检查，否则容易造成发动机运动副过度磨损，甚至发生曲轴轴承烧结等重大机械故障。     

奶爸的自我修养 即使已为人父也从未放弃速度的追求

我们,是奶爸,有家庭的男人;我们,是改装车玩家,有梦想的男人;我们,年轻过,喜欢驾驶爱驹在路上狂奔,能让我们慢下来的,不是磨损过度的轮胎;不是日渐拥堵的闹市街区不;是铺天盖地的红绿灯,而是一份爱,一份责任。我们是奶爸,有奶爸的自我修养。     

控制大跨连续刚构桥梁过度下挠的技术应用

刚构桥具有养护简单、行车舒适、结构刚度适宜、变形比较小、抗震能力比较好等特征,其应用效果比较好。此文主要就大跨连续钢构桥梁过度下挠的实际控制方法出发,为分析研讨其应对方法。     

过度竞争的我国内河港口

近年来,我国经济快速增长,大量行业出现了激烈竞争,其中更有一些行业出现了过度竞争的现象.     

Effects of rhubarb extracts on hyperexcitability of hippocampal CA1 neurons after fluid percussion injury

Objective To investigate the effects of rhubarb extracts, i.e. rhein and emodin, on the neuronal hyperexcitability and synaptic transmission, and to ,further reveal the mechanism of the secondary brain damage. Methods The fluid percussion injury （FPI） rat model and extracellular recording method were used. The evoked field potentials by stimulating Schaffer collaterals were collected from the ipsilateral （impact side） and the contralateral hippocampal CA1 areas of rat in vitro . And the field potentials, including the field excitatory postsynaptic potential and the population spike, were analyzed. Results After the impact was performed on the rat parietal cortex, the evoked field potentials in the ipsilateral hippocampus CA1 area were enhanced obviously. Rhubarb extracts reduced the slope of the field excitatory postsynaptic potential and the number of the population spike significantly while rhein and emodin increased the latency of the population spike obviously. Conclusion Rhubarb extracts, i.e. rhein and emodin, can depress the neuronal hyperexcitability, which suggests that rhein and emodin play an important role in protecting the central nervous system from neuronal damage after traumatic brain injury. FPI produces hyperexcitability of hippocampal CA1 neurons, probably by enhancing excitatory synaptic transmission.     

船用低速柴油机气缸套过度磨损的综合评述

气缸套的磨损主要是由早期的磨粒磨损和后期的熔着磨损合成造成的，缸套发生过度磨损时，不能单纯地追究缸套的材质问题，而要注意缸套与活塞环的硬度匹配以及磨合等问题。     

单车运动中1%的哲学

正如果在每个领域都能进步1%,慢慢累积的话,有一天会突然发现你已经进步了5%,甚至更多。一个有趣的理论说:如果在每个领域都能进步1%,慢慢累积的话,有一天会突然发现你已经进步了5%,甚至更多。英国国家自行车队就是抱着这样的哲学,从1支普通强队,逐渐成为超级劲旅。不仅在场地赛所向披靡,队中也不乏出色且成功的职业公路车选手。其实"1%哲学"不仅适用于职业车