time derivative

I'm going to take the time derivative just as I did in the case of the spring.

我将要提取时间，就像我在，弹力那个例子里那样。

The second time derivative is the constant acceleration.

它的二阶导数就是这个恒加速度。

The greatest sum of the exponents of the variables in a term of a polynomial or polynomial equation. There is a power law relation between the modificatory factor and the time derivative of the period.

次数多项式或多项式方程中变量的幂的最大数从统计上得到修正因子与周期变率的幂律关系。

As shown by the case studies, complicated spatial geometrical relationships can be easily tackled with the vectors and tensors mapped onto the most appropriate system of coordinates, by employing the transformation matrix and its time derivative

实例中应用坐标转换矩阵及其时间导数，可较容易地处理繁复的空间几何关系，并能将各矢量或张量向最适宜的坐标系投影

Then, by choosing Lyapunov functional and linear matrix inequality technique, the delay-dependent global asymptotical stability of the network can be obtained, where the delay is bounded and its time derivative is smaller than 1.2.

然后，通过适当的Lyapunov函数和线性矩阵不等式技术，在时滞有界且时滞的变化小的条件下，给出了该神经网络的全局渐近稳定性判据。本文的结果不依赖于时滞。

The referential time is derivative; it is extracted from the reflecting time.

指称性时间是派生性时间，是对呈现性时间提取和认知加工的结果。

I take the time derivative.

我会计算时间导数。

The systems which have some variables with a small parameter ( non-negative) on the time derivative in system state model are named singularly perturbed systems.

如果得到的系统状态模型的部分变量关于时间的导数含有一个小参数（非负），则称此类系统为奇异摄动系统。

With mixed finite element method, the unknown function value is got, at the same time more accurate derivative is come up. The two-grid method divides the domain for two times.

混合有限元方法在求解函数值的同时得到导数值，而且精度比通过函数值差商的结果要高；两重网格算法对求解区域进行两次剖分，将非线性迭代归结在粗网格上进行。

For the first time, derivative distribution of velocity in cell is presented and some new conclusions are obtained.

首次给出了电池内的速度导数分布，得出了一些新的结论。

There were several regime changes during my time in the derivative department.

我在衍生工具部门期间，有过几次重要的人事变动。

I focussed on the integral, rather than the time derivative thereof.

我更关注整体, 而不是由此衍生出来的时间.

There is a power law relation between the modificatory factor and the time derivative of the period.

从统计上得到修正因子与周期变率的幂律关系。

Then, using the second-order central difference to discretize the time derivative of the displacement, and applying the quadrature formula to the mass matrix, a fully discrete lumped mass Morley element method is developed for the same problem.

然后利用中心差分格式离散时间方向的二阶导数，再利用适当的求积公式得到薄板弯曲问题的集中质量Morley元全离散格式。

The boundary conditions of reservoir has obvious influence on the pressure response, compared with constant-pressure boundary condition, sectional constant-pressure boundary condition obviously postpones the time of pressure derivative curve dropping;

油藏的边界条件对油藏的压力动态存在明显影响，与定压边界条件相比，分段定压边界条件明显延迟了压力导数曲线下掉的时间；

From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso-and small-scale motion.

由尺度分析可以发现：在一般中小尺度运动方程中，时间导数项较其中的各主要项小一个量极。

Firstly, we give out the numerical approximation of time fractional Riemann-Liouville derivative.

首先我们给出时间分数阶Riemann-Liouville导数的数值近似。

Objective To investigate the effects of hematoporphyrin derivative ( HPD) in different concentrations on photodynamic therapy for human esophageal cancer cell line Eca-109 in vitro at various time points.

目的：探讨血卟啉衍生物（hematoporphyrin derivative，HPD）孵育浓度和孵育时间对人食管癌细胞Eca-109体外光动力疗法（Photodynamic Therapy，PDT）效应的影响。

There are two difficulties in the spike detection: spike signals are frequently superimposed on local field potential ( LFP) that reflect the activity of populations of cells near the electrode tip, moreover, the recorded extracellular signal represent a time derivative of the intracellular signal.

从记录的信号中检测锋电位（spike）将遇到两个困难：由周期性振荡的局部场电位引起的基线漂移和由溶液-电极-细胞系统的微分效应导致的锋电位波形变化。

According to theoretical analysis, the time derivative curves of water-oil ratio can be used to diagnose the reasons of water output in oil well.

为提高油藏调剖堵水的成功率，必须搞清油井的出水机理及主要影响因素，利用油井水油比对时间导数曲线的形状，根据理论分析结果，可以判断油井出水的原因。

In this thesis, the time derivative term of the control equation is left multiplied by Turkel preconditioning matrix. Several preconditioned time and space discrete schemes are derived in details.

本文通过在控制方程时间导数项左乘Turkel预处理矩阵，详细推导了适用于不同时间推进格式以及空间离散格式的低速预处理过程。

The storage time of derivative solution also have greater impact on the accuracy of the detection.

并且提取液衍生化后放置时间对检测的准确性也有较大的影响。

First, we discrete time derivative with difference methods, and discrete space derivative with Interpolation methods, then we have an implicit format.

首先对时间导数项进行差分离散，然后对空间导数项进行插值离散，得到一个隐式格式。

The time-varying delay is assumed to be bounded and its time derivative is smaller than some positive constant.

文中假定时变时滞是有界且其变化率小于某一个正常数。

Yes, I divide* m Oh, there's an m here, m And now what I'm going to do, I'm going to take the time derivative of this equation.

对，我除以。，哦，这里有个，应该在这里。，and，the，m，has，to，be，here。，现在我要做的，我将把这个等式，转化成与时间有关。

We've done this before& this is the conservation of energy, and in order to find the period of the simple harmonic oscillation, we take the time derivative.

以前算过-，这是能量守恒，为了算出，简谐振荡的周期，我们求时间导数。

This paper analyzes, through actual cases, the forms of pressure build-up curves from non-flowing wells and studies whether boundary problems exist in case that late time derivative curve raises or drops.

通过实例，对非自喷井压力恢复曲线形态进行了分析，并对导数后期曲线上翘或下掉反映油气藏是否存在边界问题进行了研究。

Some first order time derivative terms are contained in the equations.

方程中含有强迫场的一阶时间导数项。

Time-fractional order reaction-diffusion equation was considered, which obtained from the standard reaction-diffusion equation by replacing the first-order time derivative by a fractional derivation of order α( 0 < α < 1).

考虑时间分数阶反应-扩散方程，它是从标准的反应-扩散方程中用分数阶导数α（0

The range of values for the time derivative of r_ ( ms) is obtained and its physical meaning is discussed in this paper.

本文得出r（ms）对时间变化率的取值范围，并对其物理意义作了讨论。