npw

At present the length of crude oil pipelines installed with leak detection system based on the NPW method has already surpassed 10,000 km in China , which has played a significant role in the pipeline running safety .

我国已经在超过1万公里的原油管道上安装了基于负压波法的管道泄漏监测系统，对管道的安全运行作用显著。

The evaluate methods of safe investment economy benefit for coal mine are classified . The Net Present Worth ( NPW ) method , the Annual method and the Internal Rate of Return ( IRR ) method of the economic benefit evaluation are introduced .

对安全投资经济效益评价方法进行了分类，并对经济效益评价的现值法、年值法和内部报酬率法进行了分析；

Equally , " no problem " ( always maddening as there nearly always was a problem ) became " no problem whatsoever , " or NPW - in order to avoid the problem of having to type out three whole words .

同样，“没问题”（这句话总是令人恼火，因为差不多每次都会出问题）也变成了“绝对没问题”——为了避免要敲三个单词的麻烦，这个词被缩写成了NPW（Noproblemwhatsoever的简写，译者注）。

On the other hand , the negative pressure wave ( NPW ) method which does not require a complicated mathematical model , with the advantages of small construction quantity , low cost and convenient maintenance , has been widely used in the field of leak detection of long-distance pipelines .

在长输管道泄漏检测领域，由于负压波法不需要建立复杂的数学模型，具有施工量小、成本低、维护方便等优点，得到了广泛的应用。

As to the Narrow Pulse Width ( NPW ) Problem of high-voltage high-power semiconductors , a novel compensating NPW technique of named Zero-Sequence Voltage Injection ( ZSVI ) technique is first proposed to eliminate the influence of the NPW on the inverter .

针对高压大功率器件存在的窄脉冲问题，提出了新型的采用零序电压注入（Zero-SequenceVoltageInjection即ZSVI）补偿方法来消除窄脉冲的影响。