可变速度

This method characterizes variable velocity, absorption coefficient and quality factor. It is feasible for improving SNR and resolution in seismic data.

该方法具有道间与道内地震波速度、介质吸收或品质因子可变的特点，并具有经济、快速、实用的优点，对地震剖面上信噪比与分辨能力的提高具有实际意义。

The choice of die opening, capstan speed, and screw RPM are all variables that determine the dimensions of the coated wire.

印模开口的选择、绞盘的速度和螺钉的每分种转速都是可变的。而这些因素将决定涂层金属丝的尺寸。

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。

In the case that the clock rate is variable, when the speed is required to be fast e.g.

在时钟率为可变的情况下，需要速度为快速时，时钟率被设置成高时钟率；当速度不需要那么快速时，时钟率可以降低来减少电能消耗。

The simulation result derives the suitable convergence factor and verifies the improvement of ...

最后通过仿真对比得到算法收敛因子的合理取值，验证了可变步长功率控制算法可有效提高功率控制精度和收敛速度。

Furthermore, a changeable update rule was introduced to accelerate the convergence speed, a forget factor and a predefined error bound were used to enhance the robustness of the algorithm.

同时还提出可变学习增益的方法来加快算法收敛速度；应用遗忘因子和学习律误差容限控制的方法来提高学习算法的鲁棒性。

FEEL COMPUTER, A mechanical device sensing airplane speed for supplying variable pressure input to the elevator control system.

感觉计算机，为向升降舵控制系统输人可变压力而感应飞机速度的机械装置。

Another reason is that the degree of linear independence of the variable basis functions composed by sigmoid functions decreases as the hidden nodes increasing, and this lead up to the inferior matrix condition number during learning, which forces the learning step length to decrease and the convergence speed to slow down.

一是因为未知系统复杂时需要较多的隐节点，从而学习的参数过多减慢了学习速度；另一个原因是随着隐节点数增加，由Sigmoid函数构造的可变基函数线性无关程度减弱，从而导致学习过程中矩阵条件数变差，迫使学习步长减小，收敛速度不得不减慢。

It consists of:(1) numerical filtering of both constant and variable parameters;(2) techniques of measuring group velocities by using "moving window" and "multiple filtering";(3) cross-correlation method of measuring phase velocities.

包括：(1)参数固定的和可变的数值滤波；(2)测定群速度的"移动窗"和"多重滤波"技术；(3)测定相速度的互相关法。

Variable Speed. Some belt drive systems are suitable for controlling the starting torque and speed, but only run at constant speed.

可变速度。一些皮带传动系统是适当的为控制开始的扭矩和速度，但只运行以恒定的速度。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。