梯度扩散

在Perona-Malik模型基础上对扩散系数进行改进，引入了同向梯度扩散函数.实验结果表明，改进后的平滑方法既能更有效地消除图像中孤立噪声点，又可以更好地保持边缘。

An improved method is proposed by adding the same direction gradient diffusion to the Perona-Malik model , and it 's proved by experiments to be able to remove the isolated noise more effectively as well as to preserve the edges better .

基于同向梯度扩散的图像去噪方法

Image denoising method based on the same direction gradient diffusion

PEMFC梯度扩散层水传输模型的研究

Research on Liquid Water Transport Model for Gradient Structure Gas Diffusion Layer of PEMFC

随后根据多孔介质的UFT（UnsaturatedFlowTheory）模型，导出了一维的梯度扩散层液态水相饱和度分布方程、液态水流量方程、液态水残留量方程、气体扩散因子方程。

Thereafter , according to the unsaturated flow theory ( UFT ) model , the equations are derived of one dimensional liquid saturation , liquid flux , liquid remaining in GDL , gas diffusion coefficient for gradient GDL .

梯度扩散理论在能量和物质输送计算中的若干问题

Problems of the GRADIENT-DIFFUSION theory in its application to the determination of mass and energy fluxes

在双层辉光离子渗金属中空位浓度梯度对扩散的影响

Effect of Concentration Gradient of Vacancies on Diffusion in Double Glow Plasma Surface Alloying

通过梯度向量扩散与梯度流跟踪，细胞图像被分割成很多个仅包含一个细胞和周围背景的小区域；然后使用自适应阈值法成功地从每一个小区域的背景中提取独立的细胞。

After gradient vector diffusion and gradient flow tracking , the cell image is separated into some small regions , each region containing one cell and its background . Local adaptive thresholding is performed for each small region , the single cell can be extracted from the background .

基于MR三维梯度回波与扩散加权成像序列的脑表面重组技术比较

Three-dimensional reconstruction of brain surface anatomy : technique comparison between flash and diffusion-weighted imaging

内部磁场梯度引起的扩散对NMR岩石测量响应的影响

Effects of diffusion due to internal gradients on NMR response in rocks

该文提出了一种基于梯度的受限扩散算法。

A gradient-based constrained diffusion algorithm is proposed in this paper .

非理想均匀磁场和线性梯度磁场中扩散衰减对温度和时间依赖性的比较

To compare the dependence of diffused attenuation on temperature and time in inhomogeneous and linear gradient magnetic field

碳扩散层的形成受合金元素与碳的浓度梯度、原子扩散、热处理工艺和堆焊工艺等因素的影响；

The carbon diffusion layer is affected by concentration gradient of alloy elements and carbon , atom diffusion , the heat treatment and surfacing processes .

目的：比较非理想均匀磁场和线性梯度磁场中扩散运动引起的信号衰减对温度、时间的依赖性。

Objective ; To compare the dependence of signal attenuation on temperature and time caused by the diffusion movements in inhomogeneous and linear gradient magnetic field .

其思想是通过可以表征边缘的图像梯度来控制扩散平滑程度，因此这是一种非线性的自适应去噪方法。

Its idea is to control the smoothness of diffusion using image gradient which represents edges , so this method is a non-linear adaptive denoising method .

新模型在传统的热方程的基础上，在梯度方向引入扩散函数后，引导扩散，使得扩散在梯度方向根据图像的特征来实施不同程度的平滑，从而保护图像的边缘信息。

Based on the classical heat diffusion model , a diffusion function is introduced in the gradient direction , which can make the diffusion occur according to the characteristic of an image .

在纤维饱和点以下时，木材内部吸着水的迁移可分为：水蒸汽压力梯度下的扩散迁移和由于干燥介质压力的波动而引起的浮动压力下的迁移两个部分。

When the moisture content is below fibre saturation point , the movement of absorbed water is subdivided into two parts : one is diffusion transfer due to the vapor pressure gradient , the other is moisture movement caused by the pressure fluctuation due to the variation of medium .

本章仅讨论由浓度梯度引起的质量扩散。

Only diffusion under a concentration gradient is considered in this chapter .

利用动力学方程组，并对其中垂直梯度项和垂直扩散项进行了参数化处理。

Dynamic equations are used in which the vertical gradient and vertical diffusion are parameterized .

β-Ti/TiC梯度材料在热扩散时成分和热应力再分布的数值分析

Numerical analysis of component and thermal stress redistribution in β - ti / tic FGM by thermomigration

在该方法中，海洋浮油膜特征表示为扩散界面，影像灰度的梯度决定了界面扩散的方向和强度。

Specifically , the image intensity gradient is utilized as the impetus and direction for oil slick propagation .

在制备功能梯度材料方面，扩散焊接作为一种新型焊机工艺已经越来越受到人们的重视，得到了工程实际的广泛应用。

The diffusion bonding has attracted more and more attention as a new welding technology , and gets the extensive practical engineering application .

从植被覆盖度变化的趋势来看，随着植被覆盖度的增加，变化率在逐渐降低；渗铬层硬度梯度因铬的扩散而变得比金刚石沉积前更平缓。

The change ratio reduces gradually as the vegetation coverage increases ; the rigidity of chromizing layers gradually reduces to that of steel substrate .

结果表明当梯度磁场作用于扩散火焰时，火焰周围气体运动被加速，火焰的形状变得尖锐，亮度增加。

The results show that the gas is accelerated , and then the flame becomes sharper and more brilliant immediately when the gradient magnetic field acts on the flame .

同时指出这种工艺快速致密化预制体的机制是由于预制体内存在较高温度梯度和碳源扩散过程受控于化学反应动力学。

The mechanism for this rapid densification process is considered that high temperature gradient within the felt and diffusion process of the carbon resource is controlled by dynamic process .

通过测试方块电阻和浓度梯度，分析了扩散气流方向以及大小、扩散温度、扩散时间、硅片衬底类型、扩散源和硅片之间的间隙等对扩散质量的影响，并选择了合适的工艺参数。

Some technical parameters are analyzed by the testing of sheet resistance and concentration grads , such as direction and flux of airflow , diffusion temperature , diffusion time , type of silicon substrate , clearance between source and silicon wafer . The proper technical parameters are fixed .