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相关概念视频

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

126
Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
126
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
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相关实验视频

Updated: Sep 18, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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基于离散的表面跳跃用于auger过程.

Xuhui Xu1, Shriya Gumber2, Oleg V Prezhdo2

  • 1College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China.

Journal of chemical theory and computation
|June 26, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了一种新的计算方法来模拟材料中的兴奋状态动态. 这种方法准确地模拟复杂的过程,如量子点中的奥格尔类事件.

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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
11:47

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相关实验视频

Last Updated: Sep 18, 2025

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14:11

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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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科学领域:

  • 计算化学计算化学
  • 材料科学 材料科学 材料科学
  • 量子物理学 量子物理学 是一种量子物理学.

背景情况:

  • 在纳米级材料中模拟兴奋状态动态在计算上具有挑战性.
  • 准确的建模对于理解能量消散和放松过程至关重要.

研究的目的:

  • 开发一种可扩展的计算方法,用于非adiabatic分子动力学.
  • 为了实现材料中复杂的电子过程的大规模模拟.

主要方法:

  • 开发了一种基础分离的非adiabatic分子动力学方法.
  • 引入了一个基于状态密度 (DOS) 的加权离散计划.
  • 通过依赖时间的施罗丁格方程和最少开关的表面跳跃验证了该方法.

主要成果:

  • 这种新方法可以对数百万个状态进行大规模的模拟.
  • 应用于量子点中的Auger类型工艺,减少难以处理的基础集.
  • 基和基的状态显著扩大能量消散通路,加速放松.

结论:

  • 开发的方法为原子模拟提供了一个高效和强大的框架.
  • 能够在低维和纳米级材料中准确模拟兴奋状态动态.
  • 突出了多刺激状态在超快速能量消散中的作用.