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Based on the fourth-order difference formula of the second derivative term, a fourth-order finite difference method is developed for solving two-points boundary value problem. 摘要从中心差分公式出发，利用二阶微分的四阶差分公式，对两点边值问题得到了一种四阶精度的差分格式。
The function (f')is usually written simply f" and is called the second derivative. 函数（f’）通常简写成f”，并称之为f的二阶导数。
The second derivative of LNA, DHA is the most prevalent fat in the brain and nervous system. DHA是由LNA转化的另一种衍生物，人体脑部和神经系统都含大量DHA。
Quinestrol in compound preparation was determined directly by using second derivative spe ctrometry. 采用二阶导数分光光度法对炔诺孕酮炔雌醚片中炔雌醚的含量进行了测定；
Besides, a preliminary study of the bottom classifying of shallow water bathymetry by spectral derivative based on simulation data is carried out in this thesis. 论文最后基于模拟的高光谱遥感反射比数据,利用光谱微分技术对海底类型区分进行了初步研究。
Be able to apply the first and second derivative tests to analyze the monotonicity and concavity of a function. 能应用导数判定函数的单调性与凹性并利用渐近线协助绘制函数图形。
The computation precision can be enhanced with the consideration of second deriv ative. 计算结果表明，考虑二阶导数的影响，可以提高计算精度。
The special equations are derived based on the quantum theory. 基于量子理论,推导了这些特殊的方程式。
It is computationally expensive and impossible to use optimization means which should compute gradient and Hesse matrix,and the second derivative. 涉及到的求导计算太繁琐,并且需要计算目标函数的二阶导数,所以对这类问题采用含计算梯度或海森矩阵的优化方法是不可行的。
The determination of clobetasol propionate by the method of second derivative linear sweep adsorptive stripping voltammetry was reported. 本文报道了丙酸氯倍他索的二次导数线性扫描吸附溶出伏安法测定。
This paper describes a sensitive method for the determination of trace estrogen and androgen by second derivative convolution voltammetry. 二阶导数卷积伏安法应用于水稻中痕量雌雄激素的检测，具有快速、灵敏、干扰少的特点。
The vertical eddy viscosity is derived based on the mixing-length theory. 垂直涡动粘性系数采用混合长度理论。
The second derivative can partly remove the influence of backgrounds, but it is also limited by the anisotropy of canopy reflectance. 二阶微分方法虽然能部分消除土壤背景的影响，但受冠层反射率非各向同性的限制。
Several kinds of powdered milk were identified fast and nondestructively by Fourier transform infrared spectroscopy (FTIR) combined with second derivative spectra. 采用红外光谱法(FTIR)并结合二阶导数谱对几种奶粉产品进行了无损快速鉴别。
Then we discuss the necessary conditions for the limit curve to be C0,C1,C2 respectively and give the derivative and second derivative of the limit curve at vertex and midpoint. 随后我们讨论了极限曲线连续，一阶连续，二阶连续的必要条件，并给出了极限曲线在顶点以及中点处的一阶导数与二阶导数显式公式。
Therefore, the general Reynolds equation is derived based on continually of liquid flow. 由此根据液流连续性推导出广义雷诺方程。
Most system testers approach this derivation based on their intuition and experiences. 大部分的系统测试者是基于他们的直觉和经验实践着这种做法。
It might seem surprising that any mathematical derivation based on the kinetic theory could be simple. 令人惊奇的是，基于分子运动论的数学推导都是简单的。
Most of the forecasts have been derived based upon TV HH numbers, along with expectations for analog cutoffs. 大部分预测是基于该地区或国家的电视家庭规模。
We applied ATR Fourier Transform Infrared(FTIR) spectra and second derivative spectra to analyze the alcoholicity and content of sugar of red wines produced by different manufacturers for the first time. 首次采用衰减全反射(HATR附件)傅里叶变换红外光谱法并结合二级导数谱对市售的若干种不同厂家葡萄酒的酒精含量和糖含量进行了快速无损分析。