相关实验视频
Updated: Feb 4, 2026

10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
13.2K
不需要梯度:在没有参考梯度的情况下,非adiabatic分子动态的ML驱动的传播
Mikołaj Martyka1, Joanna Jankowska1, Hans Lischka2
1University of Warsaw, Faculty of Chemistry 02-093 Warsaw Poland jjankowska@chem.uw.edu.pl.
Chemical science
|February 2, 2026
概括
机器学习现在可以实现无梯度的非adiabatic分子动力学 (NAMD) 模拟. 这一突破使得复杂的兴奋状态动态计算以前是不可能的,因为无法使用的分析梯度.
科学领域:
- 量子化学是一种量子化学.
- 计算化学是一种计算化学.
- 机器学习应用程序 机器学习应用程序
背景情况:
- 机器学习 (ML) 显著提高了分子计算效率.
- 非adiabatic分子动力学 (NAMD) 模拟通常需要分析能量梯度,限制方法选择.
- 梯度计算是动力学中先进的电子结构方法的一个瓶.
研究的目的:
- 开发和验证NAMD模拟的无梯度ML方法.
- 为了使NAMD模拟使用缺乏分析梯度的电子结构方法.
- 为复杂的分子系统推进激发状态动力学模拟.
主要方法:
- 微调一个基本的ML模型 (OMNI-P2x) 仅仅在能源上.
- 利用自动可区分性来导出ML潜力的力.
- 在富尔文和环二烯等基准系统上验证无梯度ML潜力.
主要成果:
- 无梯度的ML潜力准确地复制了AIQM1/MRCI,CASSCF和MRSF-TDDFT的NAMD群体和动态.
- 首次启用了QD-NEVPT2级别的NAMD模拟.
- 在模拟循环二烯光诱导的环开放动力学方面实现了高精度.
- 对*trans*-azobenzene光异构的全维兴奋状态模拟在理论上前所未有的水平上进行.
结论:
- 无梯度ML潜能成功克服了NAMD中分析梯度要求的局限性.
- 这种方法显著扩大了可访问的高层电子结构方法的范围,用于激发状态动态.
- 该方法为模拟复杂的光化学过程设定了新的标准.
相关概念视频
What is an Electrochemical Gradient?
127.8K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
127.8K
Energy Line and Hydraulic Gradient Line
2.2K
Based on Bernoulli's equation, the energy line (EL) and hydraulic grade line (HGL) provide graphical representations of energy distribution in a fluid flow system. For steady, incompressible, inviscid flows, Bernoulli's equation is expressed as:
2.2K
Gradient and Del Operator
4.5K
In mathematics and physics, the gradient and del operator are fundamental concepts used to describe the behavior of functions and fields in space. The gradient is a mathematical operator that gives both the magnitude and direction of the maximum spatial rate of change. Consider a person standing on a mountain. The slope of the mountain at any given point is not defined unless it is quantified in a particular direction. For this reason, a "directional derivative" is defined, which is a vector...
4.5K
Electrochemical Gradient and Channel Proteins: An Overview
4.7K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
4.7K
Inertial Frames of Reference
8.8K
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
8.8K
Non-inertial Frames of Reference
7.2K
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
7.2K

