Meanwhile, the influences of pipeline internal pressure, wall thickness, crack arrest length and initial crack velocity on the crack driving force (crack propagation) are further studied.

进而分析了管道内压、壁厚、裂纹止裂长度和初始裂纹速度对裂纹驱动力(也即裂纹扩展)的影响。

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Armor Holdings, for example, subcontracts its business in Russia (protecting multinationals such as Philip Morris, a food and tobacco company) to a local security company formed by veterans of the Alpha commando force, one of the Kremlin's crack military units before its disbandment.

ECONOMIST: Corporate security

Foreigners have been a particularly notable force in rebounding Florida, where 26 ZIP codes crack our list.

FORBES: Manhattan's Now Home To America's Most Expensive Zip Code

Debates have raged as to whether the drop in the city's crime is due to more accountability within the police force, improved economic conditions, or addressing their crack cocaine problem.

BBC: Will crime maps work?