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国家自然科学基金(91334204)

作品数:2 被引量:3H指数:1
发文基金:国家自然科学基金中国博士后科学基金国家重点基础研究发展计划更多>>
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小波变换和自适应邻域对比度下的X射线图像增强
针对X射线图像细节不够清晰,噪声增强过大以及细节对比度过低的问题,基于小波变换和邻域对比度增强,提出了一种X射线图像增强方法。该方法首先利用幂律变换对图像灰度初步调整,再采用小波变换对X射线图像进行多尺度分析与重构。通过...
张玉成孟凡勇杨民
关键词:小波变换多尺度分析图像增强
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光滑粒子动力学粒子的弹性势能
由于具有无网格拉格朗日运动特征,光滑粒子动力学(Smoothed particle hydrodynamics,SPH)在处理复杂运动界面等方面具有独特优势,已被用于解决各类流体力学甚至固体力学问题。相关研究表明,SPH...
周光正葛蔚
关键词:COUETTE流非牛顿流体
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Extending the EMMS/bubbling model to fluidization of binary particle mixture: Formulation and steady-state validation被引量:3
2019年
The EMMS/bubbling model originally proposed for fluidization of monodisperse particles is extended to fluidization of binary particle mixture in this study.The dense and dilute phases are considered to comprise of two types of particles differing in size and/or density.Governing equations and the stability condition are then formulated and solved by using an optimization numerical scheme.The effects of bubble diameter are first investigated and a suitable bubble diameter correlation is chosen.Preliminary validation for steady state behavior shows the extended model can fairly capture the overall hydrodynamic behaviors in terms of volume fraction of bubbles and average bed voidage for both monodisperse and binary particle systems.This encourages us to integrate this model with CFD for more validations in the future.
Nouman AhmadYujie TianBona LuKun HongHaifeng WangWei Wang
关键词:BINARYFLUIDIZATIONMESOSCALE
The anisotropy of free path in a vibro-fluidized granular gas
2016年
The free path of a vibro-fluidized two-dimensional(2D) inelastic granular gas confined in a rectangular box is investigated by 2D event-driven molecular simulation. By tracking particles in the simulation, we analyze the local free path.The probability distribution of the free path shows a high tail deviating from the exponential prediction. The anisotropy of the free path is found when we separate the free path to x and y components. The probability distribution of y component is exponential, while x component has a high tail. The probability distribution of angle between the relative velocity and the unit vector joined two particle centers deviates from the distribution of two random vectors, indicating the existence of the dynamic heterogeneities in our system. We explain these results by resorting to the kinetic theory with two-peak velocity distribution. The kinetic theory agrees well with the simulation result.
梅一枫陈延佩王维厚美瑛
基于CUDA的DR图像多尺度金子塔增强算法
针对直接从探测器获取的:DR图像质量不佳的问题,本文采用多尺度金字塔方法进行:DR图像增强,文中高斯金字塔的分解层数为4层,分别对不同尺度的低频信息和高频信息增强,然后进行图像重构,得到增强图像。实验表明,该算法对:DR...
冯健贺鹏辉何具由亚欣孟凡勇
关键词:CUDA多尺度图像金字塔
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