Comprehensive utilization of non-destructive methods such as ultrasonic, impact echo and ground penetrating radar to study the characteristics of the internal structural of early hardened concrete.

综合利用超声波、冲击回波、探地雷达等手段研究了凝结硬化早期混凝土内部的结构特征。

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The applications of impact-echo method on nondestructive testing for concrete structures are researched in this paper.

本文针对冲击回波法在混凝土无损检测中的应用展开研究。

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The measuring results in field show that the impact-echo method is effective in measuring the depth of surface-opening crack.

现场测试表明，该方法对开口裂缝深度的测试是相当有效的。

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But let's face it: These are cable channels with relatively modest audiences, and their impact is sometimes exaggerated inside the Beltway echo chamber.

CNN: Obama, Gore, stop whining about right-wing media

"These initial findings are very encouraging and echo our own results and our conclusion that the impact of urban heat islands on the overall global temperature is minimal, " Jones said in a statement.

CNN: New climate study deals blow to skeptics