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相关概念视频

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Water and Mineral Acquisition02:34

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance01:07

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Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
A recent model describes pravastatin's hepatobiliary excretion,...
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Transport of Surface-modified Carbon Nanotubes through a Soil Column
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在COMSOL多物理中的顿石的反应式运输模型:基准和验证练习.

Virginia Cabrera1, Rubén López-Vizcaíno1, Ángel Yustres1

  • 1Geoenvironmental Group, Department of Civil Engineering and Construction, Civil Engineering School, University of Castilla-La Mancha, Ciudad Real, Spain.

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概括

本研究引入了一个新的反应式运输模型,用于深层地质仓库中的土岩壁垒. 该模型准确地模拟了在变化的地下水条件下本托尼特的行为,提高了核废物处理的安全性.

关键词:
一个基准的基准.托尼特 (Bentonite) 是一种托尼特.科姆索尔 (COMMSOL) 是一个国家.透试验 透试验 透试验这是一个MX-80型机器人.反应性运输是一种反应性运输.

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A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates
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科学领域:

  • 地质工程是地质工程.
  • 环境科学 环境科学
  • 材料科学 材料科学 材料科学

背景情况:

  • 深层地质仓库是废核燃料处置的主要方法.
  • 压缩本顿石是一种重要的工程障碍,将废物与宿主岩石隔离.
  • 了解土石对地下水变化的反应对于仓库安全至关重要.

研究的目的:

  • 开发和实施一种新型的托尼特反应式运输模型.
  • 模拟在仓库环境中在不同的地化学条件下本托尼特的行为.
  • 加强对核废物深层地质仓库的安全评估.

主要方法:

  • 通过使用COMSOL Multiphysics开发了一种新的托尼特反应式运输模型.
  • 该模型包含一个复杂的地化学系统 (42种物种,4种矿物质) 和Nernst-Planck运输方程.
  • 它模拟了跨宏观和微观结构层面的双孔性媒体行为.
  • 该模型独特地整合了化学特异化和运输方程解决.

主要成果:

  • 该模型与基准实验成功验证和验证.
  • 模拟准确地反映了压缩的顿石的多元组件附带-扩散行为.
  • 该模型展示了预测本托尼特对地下水演变的反应的能力.

结论:

  • 开发的反应式运输模型是评估本托尼特屏障性能的一个有价值的工具.
  • 这种综合方法增强了对核废物处理中的工程屏障系统的理解.
  • 该模型有助于深层地质存储库的安全性和可靠性.