查询词典 derivative

In this paper,two nonlinear anisotropic diffusion filtering methods are presented and they are based on the multispectral anisotropic diffusion models proposed by Pope and Acton.We build a couple of new diffusion coefficients in partial derivative equation based on Tukey's biweight estimator error norm by recurring to the relationship between robust statistics and anisotropic diffusion incorporated with the nonlinear time-dependent cooling technique for gradient threshold.

在Pope和Acton提出的两个多光谱图像各向异性扩散滤波模型的基础上，通过各向异性扩散和稳健统计学的联系，建立了基于B iwe ight Estim ator误差模型的扩散系数，同时利用非线性退化技术对梯度阈值的改进，提出了两个基于各向异性扩散方程的非线性滤波方法。

Methods Cross-sectional study was performed for all AIDS patients registered in the local center for disease control and prevention with free thoracic roentgenogram,sputum-smear examination, purified protein derivative skin test and CD4 count.

方法对当地登记在册的AIDS患者进行横断面调查，免费进行X线摄片、痰涂片、PPD皮试和CD4计数。

This word is a derivative. Can you point out its root?

这是个派生词，你能指出它的词根吗？

RRR-α-tocopheryl succinate , a derivative of natural vitamin E, is a potent inhibitor of various cancer cell types in vitro and in vivo.

维生素E琥珀酸酯是天然维生素E的衍生物，因其能够抑制多种肿瘤细胞的生长、对正常细胞无不良影响而倍受关注。

Where is the time-derivative of the scale factor.

其中 是尺度因子对时间的导数。

By using Schauder fixed point theorem and upper and lower solution method,we ob- tain some new existence criteria for positive solution to a singular p-Laplacian BVPs with sign-changing nonlinearity involving derivative.

借助于上下解方法和Schauder不动点定理，建立了测度链上非线性项变号的奇异p-拉普拉斯多点边值问题正解的存在性准则。

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。

Newton's second law also has second derivative of time...

这也是把量子力学意义下面的K－G方程作为基本动力学方程的一个问题吧。

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。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。