查询词典 scale-formed

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。

Actually, such a generalized Cauchy distribution was the Pearson VII probability distribution. In this dissertation, the Lorentz distribution was regarded as a generalized Cauchy distribution with only one scale parameter; while the Pearson VII distribution was regarded as a generalized Cauchy distribution with a scale and a shape parameter both.

因此，本文提出应在Lorentz分布的密度函数中再增加一个能够反映分布函数尾部特征的形状参数，希望通过该参数的可调节性进一步改善稀疏编码算法的自适应性。

There are also large scale gypsum and celestite deposit,middle scale sulfur iron ore within 10 km~2.,besides lead-zinc deposit.Some basic geological problems are still ambiguous,and ore deposit genesis are controversial.

除铅锌矿外，在矿区不到10km~2的范围内尚有大型石膏矿和天青石矿，以及中型硫铁矿等，成矿地质条件相当复杂。

Both Fahrenheit scale and Celsius scale of temperature.

它们都是温度的单位。

From two to five chapter, there are mainly four research contents, which are the ultra-precision machining mechanism of engineering ceramic in the aspects of micro-scale and macro-scale, the key technology equipment, the ductile regime grinding experiments and surface quality of ultra-precision grinding. At last, there is a summary of the whole thesis.

第二章至第五章是本论文研究的主要内容，即工程陶瓷超精密磨削机理、超精密加工的关键工艺装备、超精密磨削的表面质量和延性域磨削实验研究四大部分，最后一章是全文总结。

Micro-scale and nano-scale modified cermet tool material is one of the most important research area of ceramic material.

对高性能金属陶瓷刀具材料的力学性能、微观结构和切削性能进行了详细的研究。

17Th article moves the scene in the large-scale mass character to be responsible to carry out the safety control duty public security organ staff, depends on is in charge of quarters the credential to enter the large-scale mass character to move the scene, legally fulfills the safety control responsibility.

第十七条在大型群众性活动现场负责执行安全管理任务的公安机关工作人员，凭值勤证件进入大型群众性活动现场，依法履行安全管理职责。

I Field of Shandong has become a large-scale farming, modern high-tech large-scale animal husbandry and the promotion of seed breeding units, and the society all the year round to the substantial supply of Luxi Cattle, Simmental, Charolais, andSmall Tail Han sheep, Boer Goats , Dairy.

我场现已成为山东养殖规模大、科技含量高的现代化大型畜牧良种繁育推广单位，并常年向社会大量供应鲁西黄牛、西门塔尔、夏洛莱、改良肉牛及小尾寒羊、波尔山羊、奶牛。

The Chinese Communist Youth League\'s this characteristic,is the organization or the government apparatus which had been established newly is unable to achieve nearly.Its organization distributed omni-directional network shape scale,the youth service comprehensive cover as well as the operation human resources,the social basis resources,the experience,the political background resources in the worldwide scale also are unique.

而且共青团的青年业务几乎涉及所有领域，其运作的人力资源、社会基础资源、工作经验、政治背景资源表现出的优势也是任何一个现有的和新成立的组织或政府机构几乎无法比拟的，尤其是其作为一个青年组织分布的全方位网络规模在世界范围内也是少有的。

Bench scale experiments were conducted on the inactivation of young Chironomid larvae by ozone, chlorine dioxide and liquid chlorine. Major influence factors on the inactivation effect of ozone were studied. Based on the bench scale experiment results the feasibility of young Chironomid larvae removal by the ozone-granular activated carbon process was discussed.

进行了臭氧、二氧化氯和液氯灭活低龄期摇蚊幼虫的对比试验，对影响臭氧灭活效果的主要因素进行了考察，在此基础上，探讨了臭氧－活性炭工艺去除水中摇蚊幼虫的可行性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。