查询词典 at one point

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。

This kind of model is a connect chart abstractly , i.e., there is a line between any dot in the chart at least, which means that there are many roads from one point to another point in expressway, so the net structure chart is called "many roads chart".

1树状图清分算法主要利用矩阵论的方法，在路网模型的基础上，根据其物理结构和路段收费规则的一些参数，生成该路网的收费数据清分表，可计算出各业主所应分得的总费用。

But while this should in theory be one of the cheapest methods of cutting emissions at an estimated $1 per tonne of carbon dioxide equivalent destroyed, according to Point Carbon, a carbon consultancy the international community ends up paying much more.

理论上这应该是削减碳排放量最便宜的方法之一，据碳排放顾问公司Point Carbon估计，其每吨二氧化碳减排量的成本为1美元，但是，国际社会最终却为此付出高得多的代价。

Of many steady testing work that have been done at Shunan gas reservoir in Maliuchang gas field, data process are respectively conducted by traditional multi-point binominal or exponential process data and one point method for deliverability equation.

在蜀南气矿麻柳场气田进行了大量的稳定试井工作，分别用传统的多点法二项式、指数式处理资料，以及用"一点法"产能公式进行资料处理，发现两者求出的气井绝对无阻流量偏差达到30%-90%，甚至更高。

Day I has let me cook meal , the noisy bell has also bloomed,I have felt have sth. on one's mind to be engaged, as soon as do not know having been awake also slept well , got up luckily at 6 o'clock much time , in the evening, have been ready for breakfast for them, 2nd day has broken down , the noisy bell has also been unable to hear, one sleep to 7 o'clock , late meal of sleep still is to be going to compose , just being it is exactly by one point lately.

第一天叫我做饭，闹铃也开了，我感觉心里有事了，一晚上不知道醒了多少次，也没有睡好，幸好6点起来了，给他们做好了早饭，第2天就坏了，闹铃也听不见了，一觉睡到7点，晚了饭还是要做的，只不过是晚吃一点就是了。

A plane curve generated by one point moving at a constant distance from a fixed point.

一个点同一个固定的点保持相等的距离来移动所产生的平面曲线。

At each point on the surface, the laws of refection are obeyed, but the angle of incidence varies from one point to another.

纸的表面上任何一点都遵循光的反射定律，但每个入射角都不同。

At the same time,select three issues carries on solve by the Year 2008's ACM\ICPC finals:air condition machine is description the elbow of air conditioning installation problem,limited the quantity and types of air-conditioning pipe under the conditions of the installation of air-conditioning method;Password suspects,this problem is giving a system password letter combinations possible combinations and length under the conditions,to design an algorithm to calculate the correct arrangement of the password;Steam roller,this problem giving the situation of urban streets,drive steam roller from one point to another point of the shortest path,is used by how many time.

同时，选取了2008年度ACM\ICPC总决赛的三道题目进行求解：空调机器这一题描述的是对空调管的安装问题，在限定空调管数量和型号的条件下空调管可能的安装方法；密码嫌疑这一题求解的是在给定一个系统密码的可能的字母组合和长度的条件下，设计一个算法以算出正确的密码的排列方式；蒸汽压路机这一题是在给出城市道路情况的条件下，求两点间压路机走完最短路径总共所花费多少时间的问题。

Of many steady testing work that have been done at Shunan gas reservoir in Maliuchang gas field, data process are respectively conducted by traditional multi-point binominal or exponential process data and one point method for deliverability equation.

在蜀南气矿麻柳场气田进行了大量的稳定试井工作，分别用传统的多点法二项式、指数式处理资料，以及用&一点法&产能公式进行资料处理，发现两者求出的气井绝对无阻流量偏差达到30%-90%，甚至更高。

The successful rate of master station reading meter data point to point at one time is 97%.

主站一次点抄成功率97%。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷