Method the filter efficiency, pressure, capabilities of inner environment and physiological parameters of the user were tested in different negative pressure conditions.
方法：在不同负压条件下对空气过滤器的过滤效率和阻力、舱内环境指标和使用者生理参数进行测试。
This article narrated the application of the negative pressure wave method in the leak detecting system of transporting-oil pipe.
主要讲述了负压波理论在输油管道泄漏监测系统的具体应用情况。
Based on the negative pressure wave, the correlation analytic method is used for leakage detection and location of pipeline, the algorithm of the leakage location is also introduced in the paper.
阐述了依据负压波法，应用相关分析法进行管道泄漏检测的原理，给出了漏点定位的算法。
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