查询词典 decomposition

Because the temperature along the pipeline is not a constant, it changes the velocity of the negative-pressure-wave; the Romberg algorithm of numeric integral and the searching for algorithm are emloyed to locate the leakage.Multi-scale decomposition and reconstruction of wavelet transform is applied to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of Δt in location formula, and the location accuracy is improved.

利用小波变换的多分辨分析和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了消噪处理；并利用小波变换技术对信号奇异点快速、准确的识别能力，对经过消噪处理后的负压波信号进行了奇异点捕捉，准确确定了定位公式中上、下游站点采集到的负压波奇异点的时间差△t，从而提高了定位的精度。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

We show that such decomposition gives the same solution with the original problem, and discuss well-posedness of the Cauchy problem based on the stratification theory.

首先证明了这样的分解与原问题同解，然后用分层方法讨论相应Cauchy问题的适定性，从而得到了原混合问题的适定的充要条件。

The Cloudy Way Composed by Liu Jiachang The graceful violin comes in with the decomposition and sliding of celesta, and gradually romances such a scene that the sky is bejeweled with twinkling stars, and a beautiful young girl is praying to the sky silently,"I will float out the cloud river with the breeze and will be brave enough to walk out from the emptiness and loneliness".

大乐队以丰富的音色奏出副歌，将一腔对爱情的渴望与追求之情，淋漓尽致的呈现出来，即便是浩瀚无垠的云河也不能承载…… 2。

The technology and mechanism of solution chemistry of preparation of strontium carbonate by double decomposition from celestite concentrate were investigated.

研究了天青石精矿复分解法制备碳酸锶的工艺及溶液化学作用机理。

There are a lot of algorithms on this problem have been developed,e.g.template based,cellular decomposition.

全区域覆盖是一种特殊的路径规划，要求遍历环境中所有的可达区域。

This paper presents a method of complete coverage path planning based on genetic algorithms,which combine the advantages of cellular decomposition and template algorithm.

提出了一种基于遗传算法的全区域覆盖算法，结合分块算法和模板算法的优点。

The result from X-ray diffraction showed cellular decomposition dominated the initial aging of Zn-Al based alloy prepared by rapid solidification with single roller.

通过100℃等温时效XRD分析可知，单辊快淬锌铝合金早期时效过程中胞状分解反应为主导。

According to the phase diagram, the diamond nucleation and growth are accompanied by the decomposition of the cementite.

金刚石单品合成之后触媒和金属包斑膜的组织与物相均以渗碳体为主。

The acceleration of cementite decomposition and the transformation of ferrite result from the increase of graphite nucleation rate by electropulsing.

脉冲电流处理后石墨形核率的增加是加速渗碳体分解和铁素体转变的主要原因。

The second is to cut a mere 100 calories from your diet , which is the equivalent of a tablespoon of butter.

第二个就是从你的饮食中减少一百卡路里，只是相当于一大汤匙的黄油。

This is where the Rorschach test comes in.

现在，罗氏测试就出现了。