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砂土体注浆有效扩散范围模型试验研究 预览
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作者 林智雄 郑斌 《菏泽学院学报》 2019年第2期44-47,共4页
本文运用模型试验法分析了砂土体这一材料模型,在不同注浆量下浆液有效扩散范围的填充规律.试验发现:砂土体注浆有效扩散范围的填充是不均匀的.注浆完成后,注浆速度v与渗透系数k、孔隙填充率η、强度p可按照幂律函数的形式拟合,且系数... 本文运用模型试验法分析了砂土体这一材料模型,在不同注浆量下浆液有效扩散范围的填充规律.试验发现:砂土体注浆有效扩散范围的填充是不均匀的.注浆完成后,注浆速度v与渗透系数k、孔隙填充率η、强度p可按照幂律函数的形式拟合,且系数均大于0.97;有效扩散距离L与渗透系数k、孔隙填充率η、强度p可分别按照指数函数、对数函数、指数函数进行拟合,且系数均大于0.98.并发现同一种被注浆的砂土体,注浆速度和有效扩散范围决定了浆液的填充率. 展开更多
关键词 砂土体注浆 有效扩散范围 模型试验 扩散模型
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Modelling Large Scale Invasion of <i>Aedes aegypti </i>and <i>Aedes albopictus</i>Mosquitoes 预览
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作者 Wenkui He Otto Richter 《理论数学进展(英文)》 2018年第3期245-265,共21页
The principle aim of this work is to simulate the invasion of two invasive mosquito species Aedes aegypti and Aedes albopictus in central Europe at a landscape scale. The spatial-temporal dynamics of invasion is inves... The principle aim of this work is to simulate the invasion of two invasive mosquito species Aedes aegypti and Aedes albopictus in central Europe at a landscape scale. The spatial-temporal dynamics of invasion is investigated in dependence of predation pressure, seasonal variation of ambient temperature as well as human population density. The introduction of temperature dependent entomological parameters enables the simulation of seasonal pattern of population dynamics. The influence of temperature, predation pressure and human population density on invasion is studied in one-dimensional cases. In two dimensions, georeferenced parameters such as annual mean temperature and human population density are prepared by a geographical information system and introduced into the finite element tool COMSOL Multiphysics. The results show that under the current temperature, central Europe cannot become a permanent breeding region for Aedes aegypti. However, southwest Germany especially the regions along the Upper Rhine Valley may provide suitable habitats for the permanent establishment of Aedes albopictus. An annual temperature rise of two degrees would lead to dramatic increase of invasion speed and extension range of Aedes albopictus. 展开更多
关键词 REACTION-DIFFUSION Equations Allee Effect Range Expansion TRAVELLING Waves Temperature Dependence
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