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。
它是位置向量的二阶导。
该算法在时间上具有二阶精度。
它的二阶导数就是这个恒加速度。
二阶堂又有了必杀投。
根据改进的二阶激波-膨胀法提出了新的判据。
According to the improved second-order shock-expansion method, a new criterion is presented.
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.
当它是曲线的时候，其弯曲的法则看起来至少是一阶至多是二阶。
When it is curved, the law of its curvature seems to be at the least of the first and at the most of the second order.
技术的二阶效应通常只有人们都使用时才会体现，但是却无处不在。
The second order effects of technology usually only arrive when everyone has one, or it is present everywhere.
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.
计算并分析了离散角对有效二阶非线性系数和倍频效率的影响。
The influences of walk-off Angle on effective second-order nonlinear coefficient and SHG efficiency were also analyzed.
本文研究高层建筑钢框架一支撑结构的二阶随机反应分析问题。
The problem of second-order stochastic response analysis of steel braced frame structures in highrise buildings is researched in this paper.
根据非局部连续介质模型，提出了一维二阶剪切应变率梯度格式。
One dimensional shear strain rate gradient formation of the second order is proposed based on the non-local continuum model.
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.
本文引入学习机的功能阶数的概念，给出二阶学习机的一种工作模型。
In this paper the concept of ability order of learning machine is introduced and a model of second order learning machine is given.
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.
该算法具有二阶收敛性，其有效性为文中展示的图像分离测试效果所证实。
The algorithm is two-order convergent, Whose validity is confirmed by effect of the image separation test.
当然，函数的二阶项，可以看出，实际上发生了变化的，函数并不是真的不变了。
Then, of course, there will be maybe quadratic terms that will actually turn that, you know, this won't really say that your function is actually constant.
本文根据极限环特性对单舍入量化器二阶数字滤波器的零输入稳定性进行了分析。
In this paper the zero-input stability of second-order digital filters with a rounding quantizer has been analyzed by the properties of limit cycles.
第一章有限差分方法主要内容是一阶和二阶的两点式、三点式和五点式差分方案。
The main contents of first chapter are several difference schemes of first-order and second-order differential equations.
阻尼比是二阶系统的一个重要的特征参数，它对二阶系统动态特性有较大的影响。
The damping ratio is an important characteristic parameter in a second-order system, which has great effect on the dynamic characteristic of the second order system.
从NS方程出发，采用二阶精度的NND格式对塞式喷管的流场进行了数值模拟。
The numerical simulations of the flow field around and aerospike nozzle cell were completed base on N S equations with Second order NND scheme.
一阶加纯滞后或二阶加纯滞后，并且提出了时滞系统的模型参考自适应控制的设计方法。
And a design method of model reference adaptive control for system with pure lag is presented.
文中的精度分析和稳定性分析表明该差分格式在等步长条件下具有二阶精度、无条件稳定。
Accuracy analysis and stability analysis indicate that this scheme has two order accuracy and is unconditionally stable when grid size is constant.
本文给出了连续系统中计算二次型性能函数对反馈系数阵的一阶和二阶灵敏度的全套公式。
A set of formulas for the computation of quadratic performance function associating with first and second-order sensitivities of feedback coefficient matrix is given in this paper.
利用这一规律和作图方法，可以解决任意位置的非退变二阶曲面的投影轮廓线的作图问题。
By using the role and the drafting methods, projective contour line of a quadric at random position can be drawn.
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？
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？
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?
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