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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。

Grow uo 2 seem to be 3catch up with 4 give up smoking 5 all sorts of 6all kinds of 7shout at sb 8take...out 9in the 1996s 10 in one"s sixties 11 can hardly do sth 12keep...from 13 stop...from 14 be fill with 15 forget to do sth 16 never mind 17go on with sth 18 keep in touch with sb 19 on the way to 20do well in 21 be good at 22 have a day off 23prefer to do sth 24hand in 25keep doing sth 26at the vet"s 27behave well

第一个应该是"grow up "成长 2 看起来似乎 3 赶上 4 戒烟 5 所有种类 6 所有种类 7 瞄准某人 8 拿出什么东西 9 在1996世纪 10 在某人60岁的时候 11 几乎不能做什么事 12 阻止什么不受什么 13 阻止什么不受什么 14 装满 15 忘记将要做什么 16 没关系 17 go on with ？

Vessel is isolated from air, is filled with running cooling water, and at one side it communicates with pump which is connected with pipeline, and at other side it communicates with outlet pipe 6 having its end located below pump which ensures running of cooling water as through syphon from pump to outlet pipe and into surrounding water basin without consuming any outside energy.

船只是孤立的，从空气，充满运行的冷却水，并在一方，它沟通与泵这是与管道，并在其他方面，它沟通与出水管6月底，其位于下面的泵，确保运行的冷却水作为通过虹吸从泵出水管和到周围水流域没有消费任何外来能源。

In the Rue Sainte-Croix-de-la-Bretonnerie, twenty young men, bearded and with long hair, entered a dram-shop and emerged a moment later, carrying a horizontal tricolored flag covered with crape, and having at their head three men armed, one with a sword, one with a gun, and the third with a pike.

圣十字架街，二十来个留着胡须和长发的青年走进一间咖啡馆，随即又出来，举着一面横条三色旗，旗上结一块黑纱，他们的三个领头人都带着武器，一个有指挥刀，一个有步枪，一个有长矛。

In the Rue Sainte-Croix-de-la-Bretonnerie, twenty young men, bearded with long hair, entered a dram-shop emerged a moment later, carrying a horizontal tricolored flag covered with crape, having at their head three men armed, one with a sword, one with a gun, the third with a pike.

圣十字架街，二十来个留着胡须和长发的青年走进一间咖啡馆，随即又出来，举着一面横条三色旗，旗上结一块黑纱，他们的三个领头人都带着武器，一个有指挥刀，一个有步枪，一个有长矛。

When two particles couple themselves in a singlet at short distances (one with spin up and one with spin down) the new nonlinear, nonlocal and nonpotential forces due to deep wave-overlappings are so attractive to overcome possible repulsive Coulomb forces, and permit new bound states at short distances which simply cannot be conceived - let alone treated - by quantum mechanics and chemistry.

当两个粒子在很小的作用距离内相互偶合成为零自旋态〔一个上旋而另一个下旋〕，深深重叠在一起的波导致新型的非线性、非局部和非潜势力的引力大到得以克服相互排斥库伦力，允许很小相互作用距离内的一种新的限制状态。量子力学和量子化学无法考虑，更不用说去处理，这种新的限制状态。

Jean Valjean gazed at the house facing him, he gazed at the barricade at one side of him, then he looked at the ground, with the violence of the last extremity, bewildered, and as though he would have liked to pierce a hole there with his eyes.

冉阿让望望他前面的房屋，看看身旁的街垒，然后又带着陷入绝境的强烈感情望望地，心里十分混乱，想用眼睛在地上挖出一个窟窿。

Once, the boy wanted say love to other girl,then he went out with some friend for meet the girl, also this girl too.when they crossed the road one car was coming so fast, girl didnt think about anything and then cover the boy, stand in front of the boy, after that the girl already at one's last gasp, the boy looked at that andwas crazy,during go to hospital girl hold his hand,because she knew she doesnt have much time be with the boy, the boy was so sad to say to the girl,"why you so foolish?"

有一次，男孩为了能向另一个女孩表白，就借著和朋友一起出来的幌子。同时，也邀请了女孩，当男孩过马路的时候，突然一辆失控的轿车迎面而来，女孩想也不想，挡在了男孩的前面，女孩因躲闪不及，生命垂危。男孩顿时傻了眼了，在去医院的路上，女孩一直握著男孩的手不放，因为女孩清晰地知道自己快死了，和男孩相处的时间没有多少了。男孩伤心地对女孩说：&你怎么这么傻啊？&

He eat me at one Mouth; one Mouthful he meant; however, I said no more to the Boy, but bad him lye still, and I took our biggest Gun, which was almost Musquet-bore, and loaded it with a good Charge of Powder, and with two Slugs, and laid it down; then I loaded another Gun with two Bullets, and the third, for we had three Pieces, I loaded with five smaller Bullets, I took the best aim I could with the first Piece to have shot him into the Head, but he lay so with his Leg rais'd a little above his Nose, that the Slugs hit his Leg about the Knee, and broke the Bone.

我就不再对这孩子说什么了，并叫他乖乖呆在那儿。我自己拿起最大的一支枪，装了大量的火药，又装了两颗大子弹，放在一旁，然后又拿起第二支枪，装了两颗子弹，再把第三支枪装了五颗小子弹。我拿起第一支大枪，尽力瞄准，对着那狮子的头开了一枪。但那狮子躺着时，前腿稍稍往上抬起，挡住了鼻子，因此子弹正好打在它膝盖上，把腿骨打断了。

Tubular bells hang at one shelf different metal pipe of length, compass have one - 1/2 8 degrees and two 8 degrees, arrange with chromatic scale, beat the clock and in charge of carrying and bringing in sounding with the musical instrument mallet at the time of play.

管钟是将不同长度的金属管下吊在一个架子上，音域有一又二分之一个八度和两个八度，以半音阶排列，演奏时用琴槌敲击钟管顶端来发出声音。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新