查询词典 constant value

Firstly, according to the effect of the integration time constant of three-phase PFC controlled by one-cycle control, the single and triple integrator realization are compared, and how to determine the value of the time constant is investigated theoretically from the view of switch voltage stress and system stability.

针对三相PFC中积分时间常数的影响，分别讨论了三积分器实现方案与单积分器实现方案中积分时间常数变化对功率因数校正效果的影响，并从开关电压应力和系统稳定性的角度讨论了积分时间常数的确定原则。

It is shown that the shear strength of expansive soil decreases with increasing number of cycles and finally reaches to a constant state. The value and cyclic number of the constant state reduce with increase of amplitude of variation of water content.

研究结果表明：膨胀土抗剪强度随干湿循环次数增加而衰减，最终趋于稳定，强度稳定值与稳定时所需循环次数均随含水率变化幅度的增加而减小。

The transient is seen to be a decaying exponential, and the commonly used measured of the speed of decay is the time constant: The time constant is the time in seconds for the decaying exponential transient to be reduced to e-1=0.368 of its initial value.

瞬态解看上去为指数衰减的，且通常用于衡量衰减速度的是时间常数：即指数衰减的瞬态解衰减至其初始值的 36.8%所需的时间。

The main contents of this course include: the elementary solution of first order differential equations, the theory of existence, uniqueness and continuity dependency of initial value problem of first order differential equations, the structure theory of higher order linear differential equation and the solution of constant coefficient equations, the structure theory of system of linear equations, basic solution matrix and the solution of system of constant coefficient equations.

本课程内容有：一阶微分方程初等解法，一阶微分方程初值问题的存在性、唯一性、连续依赖性理论，高阶线性微分方程解的结构理论和常系数方程解法，线性方程组的结构理论、基解矩阵和常系数方程组的解法。

First of all,we have given some of the basic concepts of differential equations, described the constant coefficient linear ordinary differential equation solution, for a class of second-order variable coefficient linear ordinary differential equation initial value problem, an approximate solution, the method is first unknown function of a definition for N sub-interval, and then in between each district within a constant coefficient ordinary differential equations similar to the replacement, the solution has been the problem as similar to the original analytical solution, and then gives a detailed second-order change order coefficient of linear homogeneous ordinary differential equation solution examples, the examples of the approximate method proposed in this paper is valid.

首先给出了微分方程的一些基本概念，讲述了常系数线性常微分方程的解法，针对一类二阶变系数线性常微分方程初值问题，提出了一个近似解法，本方法是先对未知函数的一个定义区间作N等分，然后在每一个小区间内用一个常系数常微分方程近似替换，所得到的解作为原问题的近似解析解，随后详细给出了一个求二阶变系数齐次线性常微分方程的解的实例，该实例说明本文提出的近似方法是有效的。

This paper introduces how to use PLC realize PID automation control system in constant liquid level system of waterworks though a instance project. It adjusts liquid level by control the valve though PID arithmetic and deals with outside program, makes the liquid level constant at the expectation value. The adjusting time is the same as manual control, but the water quality is better. Its advantages are reaction rapidness, auto-control disengage intervenor, quick protection of fault, more safety and stabili...

本文以一工程实例介绍了如何用PLC在水厂的滤池实现PID恒水位控制，它通过PID算法和外围的程序处理，通过控制阀门开度来调节水位，使水位基本恒定在期望值，并且阀门调节次数基本与手动调节一样，但水质却明显好很多，更重要的是对现场适应能力强，反应快，而且完全脱离人为干预进行全自动控制，对故障也有快速保护，更具安全稳定性。

This paper introduces how to use PLC realize PID automation control system in constant liquid level system of waterworks though a instance project. It adjusts liquid level by control the valve though PID arithmetic and deals with outside program, makes the liquid level constant at the expectation value. The adjusting time is the same as manual control, but the water quality is better. Its advantages are reaction rapidness, auto-control disengage intervenor, quick protection of fault, more safety and stabilization.

本文以一工程实例介绍了如何用PLC在水厂的滤池实现PID恒水位控制，它通过PID算法和外围的程序处理，通过控制阀门开度来调节水位，使水位基本恒定在期望值，并且阀门调节次数基本与手动调节一样，但水质却明显好很多，更重要的是对现场适应能力强，反应快，而且完全脱离人为干预进行全自动控制，对故障也有快速保护，更具安全稳定性。

Concerning value distribution theory, Q.C.Zhang got the following result:Let f be a non-constant meromorphic function in C, b is a finite non-zero complex number, if f and f" CM share 0 and IM share b, then: f ≡ f", or f =(2b)/(1-ce-2z) here c is any non-zero constant.

在值分布理论中，张庆彩得到了这样的结果：设f是复平面上的非常数亚纯函数，b是非零的有限复数，若f和f′CM分担o且IM分担b，则： f≡f′，或者 f=2b/1-ce-2z ，其中c是任意非零常数。

More defects forming in the growth plate during deposition almost attribute to the lattice constant relaxation, which makes its lattice constant get larger. However, self-annealing of diamond thick films for long time in the process of deposition makes their lattice constant in their interior and nucleation plate approach its natural value.

化学气相沉积金刚石初期生长的晶体存在大量的空位等缺陷，晶格松弛，在金刚石膜持续生长过程中，形核面和膜内部在高温下发生长时间的自退火，缺陷浓度下降，晶格松弛现象消除，晶格常数变小并趋于理论值。

In which T k is the mean kinetic temperature; D H is the heat of activation, 83.144 kJ·mole 1 (unless more accurate information is available from experimental studies); R is the universal gas constant, 8.3144 × 10 3 kJ·mole 1 ·degree 1; T 1 is the value for the temperature recorded during the first time period, e.g., the first week; T 2 is the value for the temperature recorded during the second time period, e.g., second week; and T n is the value for the temperature recorded during the nth time period, e.g., nth week, n being the total number of storage temperatures recorded (minimum of 52 weekly entries) during the annual observation period.

公式中Tk代表平均动力温度；⊿H代表激活的热能，83.144KJ.mole-1（除非从试验研究中能得到更精确的信息）；R代表气体常数，8.3144×10-3KJ.mole-1.degree-1；T1为第一时间段记录的温度数值，例如，第一周；T2为第二时间段记录的温度数值，例如，第二周；Tn为第n时间段记录的温度数值，例如，第n周，n为记录的贮存温度的总数（每周一次记录，在每年的监测周期内最小为52次）【注释：所有温度T，为绝对温度，单位为开尔文。

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。