总而言之，我们所做的就是求二阶导数。
那么二阶导数判定是怎样的呢？
它就是位置，对时间的一阶导数。
它的二阶导数就是这个恒加速度。
他们说二阶导数转为正值了。
方法：采用一阶导数分光光度法。
METHODS: The first order derivative spectrophotometry was used.
我们不可以用2阶导数来观察或者别的什么方法。
We cannot use second derivative tests or anything like that.
方法一阶导数分光光度法。
方法：采用一阶导数分光光度法进行含量测定。
Method: The content of fluconazole in gel was measured by first order derivative spectrophotometry.
当我们这样做时就得到了结果，因为在这些例子中，一阶导数是熵。
And what's fallen out when we do that, because in each case, one of the first derivatives gives us the entropy.
这一因素被称为是“二阶导数”，或者是变化率的变化率。
This factor has been dubbed "the second derivative", or the rate of change of the rate of change.
这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。
That is a critical point. And we used the second derivative to see that this critical point is a local maximum.
在此方程中，弥散项和对时间的导数为分数阶导数所代替。
In this equation, the diffusion is a fractional order derivative of time and space.
传统的条码识别方法是通过二阶导数零交叉来定位条码边界。
Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
重力梯度为重力位的二阶导数，可以通过星载梯度仪进行观测。
Gravity gradient is the second order derivative of gravitational potential, which can be observed by satellite gradiometer.
本文提出了凹型压力恢复曲线的一阶导数图版和二阶导数图版。
The first and second derivative plates of concave pressure build-up curve are presented in this paper.
利用凸函数或微积分中二阶导数符号可以直接给出一连串不等式。
That is, a succession of inequations can be obtained directly by using convex functions or quadratic derivative symbols in calculous.
曲率又是位移的二阶导数，同时曲率又与应变存在着一一对应关系。
The curvature is the second order derivative of displacement. Also, it has a liner relationship with stain.
本文采用一阶导数紫外分光光度法直接测定注射用苯妥英钠的含量。
The Content of phenytoin sodium (for injection) was determined directly by the first order derivative spectrophotometry.
采用了压缩性的坐标变换后，推导得到了五个一阶导数的微分方程组。
Using a compressibility coordinate transformation, a set of the first derivative differential equations has been derived.
本文旨在研究求解非凸约束优化问题的基于二阶导数的微分方程方法。
The aim of the dissertation is to study second order derivatives based differential equation approaches to nonconvex constrained optimization problems.
本文导出了二阶导数的多分辨表示公式，并与有限差分表示进行了比较分析。
In the paper, we proposed the formula of the multiresolution representation for the second derivation, and compared their difference.
和以前一样，它来源于这样一个事实，混合二阶导数，求导次序改变，结果不变。
And, as before, this comes from the fact that the mixed second derivatives are the same, no matter in which order you take them.
有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。
So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.
他们说，二阶导数正在趋正，意思是：尽管经济仍在下滑，但是下滑的速度减缓了。
The second derivative, they say, is turning positive. That means that although the economy is spiralling down, it is doing so more slowly.
目的建立一种一阶导数紫外分光光度法测定plga微球内生长激素含量的方法。
OBJECTIVE a method of first derivative UV spectrophotometry for growth hormone in PLGA microspheres was described.
目的拟合列车车轮踏面的实恻轮廓曲线，方法采用三阶导数连续的分段曲线拟合法。
Aim To determine the measured profile of a wheel in railway vehicle. Methods So - called piecewise curve-fitting method of the third derivative continuity is employed.
为了提高尺寸预测的准确性，将实际磨削尺寸的一阶导数和二阶导数做为网络的输入。
The first and the second derivative of the actual amount removed from the workpiece were added into the network input to improve the prediction accuracy.
基于离散余弦变换(DCT)的重力异常垂向二阶导数的计算方法是笔者提出的新方法。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform (DCT).
基于离散余弦变换(DCT)的重力异常垂向二阶导数的计算方法是笔者提出的新方法。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform (DCT).
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