Energy increment criteria for evaluation of train derailment

The criteria for evaluation of train derailment were studied. The worldwide commonly used evaluation criteria for wheel derailment were summarized and their main problems were pointed out. The mechanism of train derailment was expounded on the basis of system dynamics stability concept. And the energy increment criteria were proposed to evaluate train derailment. By applying the criteria, the calculated results concerning 6 cases of freight train derailment on tangent railway line and 6 cases of freight train derailment on bridge were obtained, which are all in agreement with the practical situation. The safety, comfort and stability results concerning 3 cases of freight train running on bridge were analyzed. In addition, the running speed limits of freight train on the Yanconggou and Donggou bridge in the Beijing-Tonghua railway line of 50km/h and 60km/h, respectively, were proposed. And the running speed of freight train on the Nanjing Yangtze River Bridge can reach 70km/h.

十月灾情

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1月3日 俄罗斯图—154式客机从伊尔库茨克市机场起飞不久爆炸,机上124人全部死亡。 1月13日 澳大利亚发生近两个世纪最严重的火灾,火势两周后才得以控制,大火烧死4人,烧毁建筑物200座,烧掉森林和牧场80万公顷。 1月22日 阿根廷马德林港附近森林大火吞噬了26名消防队员的生命。 2月2日 扎伊尔开赛区火车出轨,死200多人。

2．过字关（上）

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不死劫

剧情: 从纽约开往费城的火车上,一个叫邓大卫的男子正在眺望车窗外的风景。 一个漂亮的女人走了过来,坐在了他的身边。显然,邓大卫被这个女人吸引住了,他悄悄地将手指上的婚戒取了下来,塞进衣兜,打算好好与这个女人套套磁。 然而,这个女人似乎对邓大卫这种拈花惹草的行为有点反感,她告诉他已结婚,就到别的座位上去坐了。邓大卫只好闭目养神。