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相关概念视频

Nuclear Power02:36

Nuclear Power

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
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Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
464
Typical Model Studies01:30

Typical Model Studies

443
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
443
Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

128
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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Biological Effects of Radiation02:59

Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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建立对放射性核酸复杂屏障系统模型的信心.

Dauren Sarsenbayev1,2, Christophe Tournassat2,3, Carl I Steefel2

  • 1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|July 3, 2025
PubMed
概括

这项研究成功地利用先进的计算软件在工程屏障系统中模拟了放射性核素运输. 模拟准确地捕捉了水泥和粘土之间的复杂相互作用,这对于放射性废物处理安全至关重要.

关键词:
离子排斥 离子排斥屏障系统 屏障系统地质废弃物仓库地质废弃物仓库高性能计算的高性能计算.放射性核素的运输是放射性核素的运输.

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Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
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科学领域:

  • 地质化学 地质化学
  • 水文地质学 水文地质学
  • 材料科学 材料科学 材料科学

背景情况:

  • 地质仓库中的放射性核化物制依赖于工程屏障系统 (EBS).
  • 了解水泥粘土相互作用对于EBS绩效评估至关重要.
  • 多级物理和化学过程控制了EBS中的溶液运输.

研究的目的:

  • 为了建模和模拟水泥-粘土相互作用-扩散 (CI-D) 实地实验.
  • 为了验证一个新的高性能计算软件 (CrunchODiTi) 用于EBS建模.
  • 为了捕捉放射性核酸的自然和人工屏障的多尺度特征.

主要方法:

  • 开发和应用CrunchODiTi软件.
  • 整合多个连续,包括电气双层 (EDL) 效果.
  • 计算复杂的3D几何和地质异型.
  • 高分辨率模拟水泥和粘土之间的接口"皮肤效应".

主要成果:

  • 在蒙特雷里地区成功模拟了CI-D实验.
  • 精确捕获EBS的多尺度物理和化学特征.
  • 证明能够解释水泥和Opalinus Clay的独特地化学和物理特性.
  • 验证了CrunchODiTi软件对复杂仓库模拟的能力.

结论:

  • 开发的建模方法可以捕捉EBS中的放射性核素运输的关键特征.
  • CrunchODiTi软件为模拟复杂的地质环境提供了一个强大的工具.
  • 准确的水泥粘土相互作用建模对于放射性废物处理的可辩护的安全案例至关重要.