二阶导数

一种基于二阶导数的BP算法

A New BP Algorithm Based on Second Derivative

总而言之，我们所做的就是求二阶导数。

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

叶绿素a和b的二阶导数荧光法测定

The determination of chlorophyll a and chlorophyll b by SecondDerivative Fluorimetry

一类k步2k+1阶刚性稳定的二阶导数方法

A class of stiffly stable k-step second derivative methods of order 2k + 1

二阶导数光谱法测定羚羊清肺散中黄芩甙含量中药XRD二阶指纹图谱方法学研究

Methodology Research on XRD Second Derivative Fingerprint of Traditional Chinese Medicine

算法在二阶导数初始计算时，运用Lagrange多项式进行曲线拟合。

Lagrange Polynomial-Fitting technique is used to calculate the second derivative .

计算重力异常垂向二阶导数的DCT法&模型实验

DCT method for calculating vertical second derivative of gravity anomalies & modeling experiment

求解Stiff常微分方程组的一类二阶导数多项式配置法

A class of polynomial collocation methods with second derivative for solving stiff ordinary differential equations

推导了二阶导数型算子的边缘定位概率Pd及假边缘检测概率Pf，继而比较了两种二阶导数型边缘检测算子的性能。

The Probabilities P_d of edge location and the Probabilities P_f of false edge detection are derived to compare the performances of various edge detection operators of second derivative model .

那个数学方程式，包括了x对时间的二阶导数，加上常数乘以x等于，还有一些限制条件。

And the mathematics of that equation involved a double derivative in time of x0 plus some constant times x equals zero with some constraints on it .

关于数值求解常微分方程的二阶导数方法的最高可达阶及其Stiff稳定性

On the Attainable Highest Order and Stiffly Stability of Second Derivative Methods for Numerical Solution of Ordinary Differential Equations

本文用紫外二阶导数光谱辅助以紫外光谱研究了HSA（Humanserumalbumin，人血清白蛋白）中芳香族氨基酸残基微环境的变化。

This paper uses the second order derivative spectroscopy to study the change of the environment surrounding the aromatic amino acid residues in the human serum albumin .

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 ) .

目的：建立以二阶导数紫外分光光度法测定酒石酸美托洛尔（MP）体外经皮渗透量的方法。

OBJECTIVE : To establish the Second-order Derivative UV-spectrophotometry for the determination of transdermal osmolality of metoprolol tartrate ( MP ) in vitro .

丹参XRD二阶导数指纹图谱具有峰位明确，峰型尖锐，特征性强的特点，不同产地丹参的差异性在二阶导数指纹图谱得以体现。

The results indicated that the obtained XRD SD fingerprints had obvious peak with sharp profile , which could distinctly embody the digital characteristics of different Salvia miltiorrhiza Bge .

Kantorovich算子的二阶导数逼近

On the Approximation of Second Derivatves by Kantorovich Operators

采用二阶导数分光光度法，对19例女性SLE患者血清氨基葡萄糖（GlucosamineGlus.）和氨基半乳糖（GalactosamineGals.）进行检测。

The level of serum glucosamine and galactosamine were determined in 19 female patients with systemic lupus erythematosus by the second derivative spectrophotometry method .

利用二阶导数给出了用Lagrange乘数法求出的解是条件极值问题的极小值解的一个充分条件。

A sufficient condition of second order is given for that solutions given by the Lagrange multiplier method are minimal solutions of the conditional extremum problem .

结果褶合光谱法与二阶导数光谱法及A260/A280比值法结果相对照。表明本法可对DNA样品中杂质进行半定量检测。

RESULTS The convolution spectrum method compared with A 260 / A 280 ratio method and second derivative absorption spectrum method could be used for the semiquantitative determinations of impurities in DNA samples and the results were satisfactory .

分别讨论了最佳波长范围以及NIR原始光谱、NIR一阶导数光谱、NIR二阶导数光谱对测定结果的影响。

The effect of the wavelength range , conventional spectra , first-derivative spectra and second-derivative spectra on the results were discussed , respectively .

如果我取A的二阶导数，混合导数，对T偏微分，再对V偏微分。

So , using those , now , what happens if we take the second derivative of A , the mixed derivative , partial with respect to T and the partial with respect to V.

从带一个参数的三阶迭代族（其中包括Halley迭代，Chebyshev迭代和超Halley迭代）出发，推出避免二阶导数计算的带两个参数的迭代族。

A family of iterations with two parameters which can avoid the computation of the second Frechet-derivative is introduced .

据此建立了一种固相萃取-二阶导数同步荧光光谱法测定卷烟主流烟气粒相物中BaP的新方法。

Hereby the present paper introduces a new method to determine BaP in cigarette mainstream smoke by solid-phase-extraction second-order-derivative synchronous fluorescence .

苦杏仁的有效成分苦杏仁苷经提取、处理后，用HPLC法、紫外分光光度法、二阶导数光谱法测定其含量。

Three analysis methods were used in this study to analyze the content of amygdalin , and the effective components in bitter apricot kernel , namely , HPLC method , UV-Spectrophotometric method and Second-derivative spectra method .

问题的关键在于A的二阶导数，对V和T以这样一个顺序求导，和对T和V以这样一个顺序，求导是一样的。

And the point is that the second derivative of A , with respect to V and T in this order is the same as the second derivative of a with respect to T and V in this order .

方法以维生素E为主要原料制成乳膏，采用二阶导数光谱法，以维生素E吸收波长295nm谷峰处的振幅D值作为定量分析信息。

Methods To take vitamin E as the main material , then to prepare Pearl and Vitamin E Cream . To take the amplitude D value of vitamin E at 295 nm as the quantitative analysis information by second derivative spectrometry .

方法分别采用双波长分光光度法和二阶导数法测定配伍液在25℃下放置0,2,4,6,8h后各成分的含量，观察混合液的pH值和外观的变化。

Methods At 25 ℃, dual wavelength and second order derivative UV spectrophotometry were designed to determine each content of cefminox sodium and aminomethylbenzoic acid at 0,2,4,6,8 h after compatibility , and the change of the liquid appearance and its pH was observed .

基于PREM模型的地球椭率及其一、二阶导数沿径向的分布

The earth 's ellipticity and its first and second derivatives versus radius based on Prem earth model

采用二阶导数光谱法测定复方地塞米松霜中氯霉素的含量，以310±1nm处为测定波长。该方法简便、快速，结果满意。

Second derivative spectrometry was used for the determination of chloramphenicol in compound dexamethasone cream .

对含二阶导数的Enright方法的改进

Improvement on enright 's second derivative method