二阶导数

Chapter 4 gives a micellar electrokinetic chromatography method for the quantitative analysis of seven podophyllum lignans in podophyllum emodi wall.

第四章：建立了胶束电动毛细管色谱法分离测定抗癌药物桃儿七中七种主要有效成分的新方法；利用二阶导数电泳图定量测定低含量和在实际样品没有达到基线分离的组份。

Results By using containing ethanol-2mol·L -1 lithium chloride-water(2∶1∶5)solution,there is a very good secondary derivative differential pulse polarogram peak at -1.703 V.

结果 ：秦皮甲素在乙醇- 2mol·L- 1 氯化锂-水(2∶1∶5 )的底液中，于- 1.70 3V处出现一良好的二阶导数差示脉冲极谱法峰，其峰幅值与秦皮甲素在 0 。2～ 1.6mmol·L- 1 范围内呈良好的线性关系(r =0 。9998)，检测限为 5 0nmol·L- 1 。

The secondary derivative differential pulse polarography was developed for the quantitative determination of chrysophanol in rheum.

建立了中草药大黄中大黄酚的二阶导数差示脉冲极谱定量分析方法。

But the projection used in gradient projection method is an orthogonal projection which does not contain the second derivative information of objective and constrained functions,thus the convergence rate of gradient projection method is not contented.

但是，梯度投影法所采用的投影是正交投影，不包含目标函数和约束函数的二阶导数信息·因而；收敛速度不太令人满意。

It was found that the pulse distortion can be quite severe depending on frequency, pulse width ,and path length.

应用傅立叶时域积分近似解方法对毫米脉冲波通过雨媒质时的传输特性进行了研究和分析，得出了脉冲畸变随频率、降雨率、脉冲宽度及传播距离的变化关系，讨论了脉冲展宽与压缩随传播常数二阶导数的关系。

Then, using the second-order central difference to discretize the time derivative of the displacement, and applying the quadrature formula to the mass matrix, a fully discrete lumped mass Morley element method i...

然后利用中心差分格式离散时间方向的二阶导数，再利用适当的求积公式得到薄板弯曲问题的集中质量Morley元全离散格式。

We prove that the imaginary part is a smoothed second derivative, scaled by time, when the complex diffusion coefficient approaches the real axis.

我们证明了虚部分是一个平滑的二阶导数，按时间，按比例在复杂扩散系数的办法实轴。

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。

Still another form for the second derivative of f with respect to x.

f对x的二阶导数的另一种形式。

The second derivative, they say, is turning positive.

他们说，二阶导数或将为正。

Life. But the intrinsic way of the Internet by wire confines accessing and using of the network information.

然而，Internet固有的有线连接方式大大限制了人们对网络信息的访问和使用。

I have a strong persuasion that this is true .

我坚信这是正确的。