相关实验视频

Updated: Jan 18, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

固定节点扩散蒙特卡洛在不同的社区代码的可复制性:水甲二元体的案例

Flaviano Della Pia¹, Benjamin X Shi¹, Yasmine S Al-Hamdani^2,3

¹Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom.

The Journal of chemical physics

|September 8, 2025

概括

固定节点扩散量子蒙特卡罗 (FN-DMC) 在小心处理时可以在不同的代码中重现. 对于伪潜在的特定近似方法,如T移动,可以确保可靠的结果,与旧方法不同.

科学领域:

计算化学计算化学
量子力学就是量子力学.
材料科学材料科学材料科学

背景情况:

固定节点扩散量子蒙特卡罗 (FN-DMC) 是解决施罗丁格方程的一个强大的方法,广泛用于预测材料和分子性质.
它的可扩展性和计算效率使它能够应对复杂的科学挑战.
然而,由于算法多样性和随机性,FN-DMC在各种代码实现中的可重复性一直是令人担忧的.

研究的目的:

评估固定节点扩散量子蒙特卡罗 (FN-DMC) 在不同社区代码中的可重复性.
确定FN-DMC结果中差异的主要来源.
为了验证FN-DMC在计算科学中的可靠性.

主要方法:

一项涉及11个不同的FN-DMC代码的全社区努力进行了.
水-甲二分仪作为标准测试案例进行比较.
分析了治疗伪潜在非局部性的各种近似方法.

主要成果:

该研究证实,当使用适当的算法细节时,FN-DMC可以在不同的代码中重现.
用于处理伪潜在非局部性的近似被确定为差异的主要来源.
T移动,决定性局部近似和决定性T移动方案产生了可重复的结果,与较旧的局部近似不同.

结论:

固定节点扩散量子蒙特卡洛 (FN-DMC) 是计算科学的一个成熟和强大的方法.
精心选择算法细节,特别是伪潜在处理,对于实现可重现的结果至关重要.
这项工作突出了使用FN-DMC开放和可靠的计算科学的潜力.

更多相关视频

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

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

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

Published on: February 23, 2018

相关概念视频

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...

Diffusion

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...