The working principle, hydraulic impact, noise have also been studied in this paper.

并介绍了工作原理，对液压冲击、噪声等问题进行理论动态特性分析。

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The paper introduces the operating principle, structure and application of hydraulic impact breaker.

介绍了液压冲击型破岩机的原理、结构及其应用。

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Solutions have been put forth upon analysis of causes producing hydraulic impact in work of hydraulic press.

分析了液压机工作中液压冲击现象产生的原因，并在此基础上提供出了解决措施。

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Spain pushed back against European shale with a local vote in the northern region of Cantabria mounted a vote against the practice of hydraulic fracking amid mounting concerns about its environmental impact.

FORBES: Why is Spain Pushing Back on Shale?

The Department of Environmental Conservation had faced a deadline Wednesday to complete its comprehensive environmental impact study of drilling for gas using high-volume hydraulic fracturing, or fracking.

WSJ: NY health chief: Longer gas-drilling study needed

Avella, author of a bill to prohibit gas drilling using hydraulic fracturing, or fracking, asked Martens whether there was a separate health impact study being reviewed by Shah and a panel of outside experts.

WSJ: DEC head: No 'timetable' on NY fracking decision