排序方式: 共有6条查询结果,搜索用时 15 毫秒
1
1.
LI Xiudi ZHENG Yingren 《天津大学学报(英文版)》2006,12(B09):177-181
In order to define the loading on protective doors of an underground tunnel, the exact knowledge of the blast propagation through tunnels is needed. Thirty-three scale high-explosive tests are conducted to obtain in-tunnel blast pressure for detonations external, internal and at the tunnel entrance. The cross section of the concrete model tunnel is 0.67 m^2. Explosive charges of TNT, ranging in mass from 400 g to 4 600 g, are detonated at various positions along the central axis of the model tunnel. Blast gages are flush-installed in the interior surface of the tunnel to record side-on blast pressure as it propagates down the tunnel. The engineering empirical formulas for predicting blast peak pressure are evaluated, and are found to be reasonably accurate for in-tunnel pressure prediction. 相似文献
2.
3.
黄一凡 《少年文艺(南京)》2013,(Z1):5
春节里,家家户户都会贴春联、放鞭炮。作为一名男子汉,我当然也喜欢放鞭炮!那天,我跟爸爸和姐姐一起去"巨人城"(一片铁轨废墟)放鞭炮。我们来到老地方——一条小水沟边。刚开始,我和姐姐都很胆小,只放小炮,而且一放完就赶紧跑到老远的地方,好像原子弹即将爆炸似的。爸爸则一边笑,一边迅速点燃"炸白菜""炸沙虫""炸瓦片""炸蜂窝煤"等各色鞭炮……只见残渣乱飞、尘土飞扬。渐渐地,我们快要"弹尽粮绝"了,这个消息对于正玩得兴起的我们来说真是"五雷轰顶"。不得已,我们要请大家伙"鱼雷"出场了。 相似文献
5.
6.
释当归 《大科技.科学之谜》2013,(3):28-29
宁可不要裤子也要造原子弹1945年8月6日8时15分,美军一架B-29轰炸机飞临日本广岛市区上空,投下一颗代号为"小男孩"的原子弹。炸弹在距地面580米的空中爆炸,在巨大的冲击波的作用下,广岛市的建筑全部倒塌,全市24.5万人口中有7.8万人当日死亡,死伤总数达到20万,整个城市化为一片废墟。三天后,美军又对日本长崎实施了第二次原子弹袭击,这次轰炸造成长崎60%的建筑物被毁,当日伤亡和 相似文献
1