We take as the second derivative formula.

取作为二次微商计算式。

So, what does the second derivative test say?

那么二阶导数判定是怎样的呢？

And all we did, further, is take that second derivative.

总而言之，我们所做的就是求二阶导数。

So, it's the second derivative of a position vector.

它是位置向量的二阶导。

The second derivative, they say, is turning positive.

他们说二阶导数转为正值了。

We cannot use second derivative tests or anything like that.

我们不可以用2阶导数来观察或者别的什么方法。

I wish I were your second derivative so I could fill your concavities.

我希望我是你的另一个衍生物，那么我就可以填充你的凹陷了。

The automatic peak-seeking algorithm was based on the covariance and second derivative.

通过协方差法和二阶求导法实现了光谱峰位的自动检测；

Basically, the answer for us is that we don't have a second derivative test in this situation.

基本上，答案就是，我们不可以用二次导数来验证这个情况。

This factor has been dubbed "the second derivative", or the rate of change of the rate of change.

这一因素被称为是“二阶导数”，或者是变化率的变化率。

Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.

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。

The Laplacian method searches for zero crossings in the second derivative of the image to find edges.

拉普拉斯算子的方法是在图像的二阶导数搜索零交叉来查找边缘。

The first and second derivative plates of concave pressure build-up curve are presented in this paper.

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。

That is a critical point. And we used the second derivative to see that this critical point is a local maximum.

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。

The second derivative curve of the gravity field can be used as filtering factor so as to improve resolution.

为了提高分辨率，可采用重力场的二次导数曲线作滤波因子。

The baicalin in cream was identified by TLC method and the content of baicalin in cream by second derivative spectrometry.

用薄层色谱法鉴别乳膏中的黄芩苷，并用二阶导数光谱法测定其含量。

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。

As the second derivative does, the forth, derivative of gravity anomaly projects local anomaly but suppresses regional anomaly.

重力异常四次导数和重力异常二次导数一样，具有突出局部异常，压制区域异常的作用。

The second derivative, they say, is turning positive. That means that although the economy is spiralling down, it is doing so more slowly.

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 of rats′serum fluorescence spectrum was analyzed to obtained spectral properties during the process of liver fibrosis.

分析了白鼠肝纤维化病变过程中血清荧光光谱的二阶导数光谱。

Traces of Germanium in 31 different species of Chinese medicinal herbs were determined by hydride generation-second derivative spectrometry.

采用氢化物发生-导数光谱法测定了31种中草药中锗的含量。

Conclusion the formulation and preparation technique are rational and the quality is easy to handle by the method of second derivative spectrometry.

结论制剂处方及制备工艺合理，二阶导数光谱法重现性好，适于该制剂的质量控制。

A new method for determining directly trace component in interfering base by absorbance subtraction -second derivative spectrophotometry is proposed.

对利用差谱—二阶导数分光光度法直接测定强干扰基体中微量组分的原理和实验方法进行了探讨。

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.

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。

Six kinds of infant powdered milk were identified by Fourier transform infrared spectra (FTIR) and their corresponding second derivative infrared spectra.

采用傅里叶变换红外光谱法(FTIR)获得了六种婴幼儿奶粉的红外光谱及其二阶导数谱。

The analysis indicates that the conditions of second derivative of the above relevant factors play an important role in the formation of great circle route.

本文研究表明，上述影响因素的二阶经向变率的存在条件对于“大圆路径”形成起了重要作用。

Then the second derivative gives the change in entropy with respect to the variable that we're differentiating, with respect to which is either pressure or volume.

二阶导数给出熵，随着变量变化的情况，这些变量包括压强或者体积。

In the second part, the deformation curvature, which is determined by second derivative of curve fitting of the deformation of the retaining structure, is proposed.

提出由曲线拟合围护墙变形，两次求导后得到变形曲率。

In outline recognition, to reduce the misjudge result from calculated error of the core position, reference frame transform and second derivative of curve were adopted.

轮廓识别采用坐标变换及曲线求二阶导数，避免了果核位置判断误差造成的误判。