那么二阶导数判定是怎样的呢？
他们说二阶导数转为正值了。
总而言之，我们所做的就是求二阶导数。
它的二阶导数就是这个恒加速度。
方法二阶导数差示脉冲极谱法。
METHODS The Secondary derivative differential pulse polarography was developed.
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.
在第七章里，讨论向量优化问题的二阶导数的稳定性。
In Chapter 7, we study stability of second-order derivatives in vector optimization problems.
二阶导数谱；
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.
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.
利用垂直于梯度方向的图像二阶导数设计了一种新的代价函数。
This paper proposes a texture preserving fourth order partial differential equations based image denoising model.
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 Laplacian method searches for zero crossings in the second derivative of the image to find edges.
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.
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.
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。
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.
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.
研究了介质镜反射系数的振幅与位相二阶导数对飞秒高斯脉冲的影响。
Studies have been made on the influences of the second order derivatives of the amplitude and phase of the reflection coefficient on the Gaussian pulse upon reflection from the dielectric mirrors.
讨论了一类非线性项含一阶和二阶导数的三阶两点边值问题的可解性。
The solvability was considered for a class of third-order two-point boundary value problem with first and second derivatives.
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.
本文应用二阶导数紫外分光光度法考察了苯呋洛尔溶液体外经皮渗透性。
Second-order derivative UV spectroscopy was used to measure the transfer of befunolol - HCl across full - thickness rabbit skin in vitro.
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.
在方向图和脊线频率的基础上，实现了基于二阶导数的指纹图像二值化算法；
We also improve on the binarization method of fingerprint images based on the 2~(nd) derivative by the orientation and ridge frequency of the images.
本文利用广义虚载荷概念，建立了应力、位移响应的一阶和二阶导数计算公式。
Based on the pseudo load concepts, general formulas for computing the first and second derivatives of behavioral parameters with respect to design variables are derived.
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。
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.
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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