查询词典 value analysis

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。

Chaudron (1988) identifies four traditions in second language classroom research:(1) psychometric studies,(2) interaction analysis,(3) discourse analysis, and (4) ethnographic analysis.

Chaudron(1988)，在第二语言识别四个传统课堂教学研究：(1)心理研究；(2)、(3)相互作用分析语篇分析，以及(4)人类学分析。

The idea of zero cost cycle is devised to solve the critical problem of minimum cost flow. Additional related results obtained include: the theory of bottleneck analysis based on minimum cost augmentation chain and zero cost cycle; the proof of the existence condition and the coherence condition of bottlenecks based on network output; methods to solve various kinds of process bottlenecks; the development of the algorithms of optimization and bottleneck analysis of MCPN (i. e, MCPN-CBA1 and MCPN-CBA2); a series of scheduling strategies and algorithms based on cost analysis, profit evaluation and bottlenecks of process flow line.

四。提出了基于工艺流程成本分析、利润评价的两类生产网络模式：最小成本生产网络和最大利润生产网络；首次提出零成本圈的概念，从而提出并研究了最小费用流的临界问题；创建了基于最小成本增广链、零成本圈的瓶颈分析理论，证明了过程瓶颈的存在性条件以及基于网络加工量的瓶颈一致性条件；给出了求解各类瓶颈的关键技术，研究开发了MCPN的瓶颈分析算法MCPN-CBA1、MCPN-CBA2；提出了一系列基于工艺流程成本分析、利润评价及过程瓶颈的调度策略和调度算法。

The development process of ST800A coin counting machine was introduced from three aspects such as the entire machine modeling analysis and design, the man-machine system analysis and design, and the color plan analysis and design.

主要从整机造型分析与设计、人机系统分析与设计及色彩方案分析与设计3个方面，较为详细的阐述了ST800A型硬币清分机造型设计的研发过程。

Combining theoretical analysis and empirical analysis is the one of features of this articles analysis.

理论分析和实证分析相结合是本文分析的特点之一。

In this paper, finite element analysis software ABAQUS simulation of stent expansion to different connection to simulate different chamfering polishing the degree of comparative analysis, the results of the analysis can be applied to the structure of stent design and polished.

在这方面，有限元分析软件Abaqus中的支架扩张不同的连接仿真模拟不同纸张倒角抛光程度的比较分析，分析的结果可应用于支架结构的设计和抛光。

In this work, the digital analysis of six Al-based standard alloy samples with different content of Mg has been performed. Using spectra of Mg 518.36 nm as the analysis spectrum line, Cu 510.55 nm and Fe 510.75 nm as comparison spectrum lines separately, quantitative analysis has been made.

对6种不同镁元素含量的铝合金标准样品进行了数字化分析测定，探索了选用Mg 518.36 nm作为分析谱线，分别选用Cu 510.55 nm和Fe 510.75 nm作为比较谱线进行定量测定的方法。

MethodsA cluster sampling of 1 474 middle-aged intellectuals was measured by the SCL-90 table and was analyzed by the Reliability Analysis, Principal Component Analysis and Analysis of Variance.

方法采用整群抽样方法，应用症状自评量表SCL-90对1474名中年知识分子进行心理状况测评，运用尺度分析、主成分因子分析和方差分析。

The analysis of molecular variance revealed that 93.85% of the variance component was attributable to the variation among individuals within ditches. Low levels of the genetic differentiation coefficient among ditches, G=0.172 and Nm=2.4, indicated that the ditches barely hinder gene flow between Scaevola populations. UPGMA cluster analysis and principal coordinate analysis revealed no major groupings among ditches or among plants.

经过分子变方分析显示海南草海桐有93.85％的变方成分存在於个体间；POPGENE分析结果显示其遗传分化系数G(下标 ST为0.172，而基因流为2.4，显示沟渠并无阻碍基因交流之能力；UPGMA归群分析及主座标分析结果显示海南草海桐个体间几乎无差别或差异很小。

Composite function is one of the important objects of mathematical analysis research,and some of it's analysis natures such as monotony, boundedness, limit,continuity, derivability,integrability are important content in the mathematical analysis,they are also important tool to study other objects in mathematics.

复合函数是数学分析研究的重要对象之一，它的一些分析性质（如单调性，有界性，极限，连续性，可导，可积性）是数学分析中的重要内容，也是研究数学中其它对象的重要工具。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。