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。
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。
Wxx If I take the second derivative with respect to x and x so first I want to take maybe the derivative with respect to x Wx But first, let's take the first partial, Wx That will be 2ax by, right?
如果我要求二阶偏导数,首先要求关于x的一阶偏导数,让我们首先求出,它等于2ax+by，对吧？
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。
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。
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 second part focuses on analysis of share-holders' derivative suit right by legal principles.
第二部分是对股东派生诉讼产生的诉权基础进行分析。
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 curvature is the second order derivative of displacement. Also, it has a liner relationship with stain.
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 Second vertical derivative of the potential field is obtained from Lapace's equation.
位场垂向二次导数是基于拉氏方程求得的。
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。
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。
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。
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。
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。
The checks by the vertical first derivative and second derivative anomalies reduced to the pole show good coincidence, which proves the reliability of the shallow layer anomaly.
经过化极垂向一次导数和垂向二次导数的验证，吻合很好，说明浅部异常的可信度高。
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。
In this paper, the formula of partial derivative of second order on compound function of many varables is established.
本文建立了多元复合函数的二阶偏导数公式。
Use is made of second derivative spectrometry, the quantity is directly determined of the monoesters, diesters and triesters in glyceride, without the samples being separated.
采用二阶导数光谱法，试样不需分离，直接测定混合甘油酯中一酯、二酯、三酯的含量。
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 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。
Gravity gradient is the second order derivative of gravitational potential, which can be observed by satellite gradiometer.
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。
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。
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。
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。
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。
For all samples, the raw spectra were pretreated as second derivative and Norris derivative filter(7,5). partial least square (PLS) was used as the calibration algorithm.
在所有的校正模型中，原始谱图经过二阶导数和偏最小二乘（PLS）处理，20个外部样品用于所建模型的验证，实际和预测的平均相对偏差<5%。
The initial regular oblique derivative problem for nonlinear parabolic systems of several second order complex equations with measurable coefficients in a multiply connected domain is discussed.
论述了多连通区域上可测系数的二阶非线性抛物[型]方程组的初-正则斜微商问题。
The initial regular oblique derivative problem for nonlinear parabolic systems of several second order complex equations with measurable coefficients in a multiply connected domain is discussed.
论述了多连通区域上可测系数的二阶非线性抛物[型]方程组的初-正则斜微商问题。
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