在进行中的

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。

Chapter 4, lists the teaching cases in teacher's teaching, combined the cases dissecting the teaching methods of mathematics and mathematical cerebration and methods in the point of view of psychology, then infers that to proceed the teaching of mathematical cerebration and methods is necessary. In the other hand, I compared and studied the association between the basic mathematical cerebration and methods and other mathematical knowledge, answer the questions that which mathematical cerebration and methods are more worthy to jut out. At last, infers a mode of the teaching in mathematical cerebration and methods.

第四章列举了教师在授课中的教学案例，结合案例从心理学角度对中学数学教学与数学思想方法教学进行剖析，得出进行数学思想方法教学是十分必要的；同时对中学数学教学中的数学基本思想方法与其它数学知识的关系进行了对比分析，对在中学数学教学中突出哪些数学基本思想方法为好做了解答；最后给出了数学思想方法教学的一个教学模式。

The HUD mess has joined the $300 billion savings-and-loan bailout and the ongoing Pentagon procurement investigation as a legacy of the freebooting Reagan years.

住都局的烂摊子和高达3000亿的信贷公司承接债务案，以及还在进行中的五角大楼采购弊案一样，都是巧取豪夺的里根时代的后遗症。

It's a work in progress.

这是一项在进行中的工作。

The most recent and still ongoing round of force reductions began in 2003 and most likely will be complete by 2005, resulting in a drawdown of 200,000 troops. This reduction will cut a large portion of the logistic force and transfer nonwarfighter functions to the civilian sector but leave the regular infantry relatively untouched.

最近仍在进行中的这轮裁军开始于2003年，极可能削减一大部分后勤部队，并将非战斗人员的功能转移给民间机构，但是仍然相对不涉及正规的步兵部队。

Smoothy is still a work in progress, but currently features the following

光滑仍在进行中的工作，但目前具有如下："/页"

But when nationalism is on the march, even commercial logic gets trampled underfoot.

但是当民族主义在进行中的时候，即使是商业逻辑也被践踏在脚下。

"They knew exactly what was going on all the time," Amin is quoted as saying.

&他们都知道现在是什么都在进行中的时候，&阿明是引述他的话说。

Artist:David Archuleta Song:Crush I hang up the phone tonight Something happened for the first time Deep inside It was a rush, what a rush Cause the possibility that you would ever feel the same way About me It's just too much, just too much Why do I keep running from the truth All I ever think about is you You got me hypnotized, so mesmerized And I just got to know Do you ever think When you're all alone All that we can be Where this thing can go Am I crazy or falling in love Is it really just another crush Do you catch a breath When I look at you 听流行英乐,看美国偶像进行中 Are you holding back Like the way I do Cause I'm tryin, tryin to walk away But I know this crush aint goin away, goin away Has it ever cross you mind When were hangin, spending time girl Are we just friends Is there more, is there more See it's a chance we've gotta take Cause I believe that we can make this into Something that will last, last forever, forever Do you ever think When you're all alone All that we can be Where this thing can go Am I crazy or falling in love Is it really just another crush Do you catch a breath When I look at you Are you holding back Like the way I do Cause I'm tryin, tryin to walk away But I know this crush aint goin away, goin away Why do I keep running from the truth All I ever think about is you You got me hypnotized, so mesmerized And I just got to know Do you ever think When you're all alone All that we can be Where this thing can go Am I crazy or falling in love Is it really just another crush Do you catch a breath When I look at you Are you holding back Like the way I do Cause I'm tryin, tryin to walk away But I know this crush aint goin away, goin away

下面是在Google里翻译出来的，还能凑合着看看吧~~】艺术家：大卫阿丘利塔歌曲：爱恋我挂断电话，今晚一定发生了什么事情，为第一次我内心深处，这是一个繁忙，什么仓促事业的可能性你会感到同样的方式关于我它只是太多了，只是太多为什么我要保持运行，从真相我想到的是你你明白我催眠，所以mesmerized 我只是到了知道你是否想过当您的所有单所有我们能如果这件事可以去我疯了，或堕入爱河是否真的只是另一个爱恋你赶上呼气当我看到你听流行英乐，看美国偶像进行中你是否持有回像我这样做原因我tryin ， tryin走开但我知道这是粉碎走离，走离它以往任何时候都跨你介意当被hangin ，花费时间女童我们只是朋友是有更多的，是有更多的看到它的一个机会，我们已经采取的宝贝事业，我相信我们可以到这一点一些会最后，最后永远，永远你是否想过当您的所有单所有我们能如果这件事可以去我疯了，或堕入爱河是否真的只是另一个爱恋你赶上呼气当我看到你你是否持有回像我这样做原因我tryin ， tryin走开但我知道这是粉碎走离，走离为什么我要保持运行，从真相我想到的是你你明白我催眠，所以mesmerized 我只是到了知道你是否想过当您的所有单所有我们能如果这件事可以去我疯了，或堕入爱河是否真的只是另一个爱恋你赶上呼气当我看到你你是否持有回像我这样做原因我tryin ， tryin走开但我知道这是粉碎走离，走离

This indicates the acceptance of responsibility and an ongoing effort to produce beautiful healthy Shelties.

这些指示和责任是和在进行中的努力是为了培育更健康的牧羊犬。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。