对于,氧和二氧化,一个统一的时刻张量潜力
Karim Zongo1, Hao Sun2, Claudiane Ouellet-Plamondon1
1Département de génie de la construction, École de technologie supérieure, Université du Québec, Montréal, QC Canada.
概括
一个新的机器学习潜力准确地描述了和二氧化的相互作用. 这种基于瞬间张量潜力框架的统一模型,为材料研究的ab initio方法提供了一个计算效率高的替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- (Si) 和它的氧化物 (SiO2) 是技术中的关键材料.
- 准确地建模Si/SiO2系统中的原子间相互作用,特别是电荷转移,使用传统方法计算要求很高.
- 现有的模型往往难以捕捉各种Si和SiO2结构的复杂性.
研究的目的:
- 为Si/SiO2/O系统开发一个统一的机器学习原子间潜力.
- 克服同时描述原子间相互作用的挑战,而无需计算上昂贵的初始方法.
- 为模拟Si和SiO2材料提供高保真性,高效的模型.
主要方法:
- 在瞬间张量潜力 (MTP) 框架内开发一个统一的机器学习原子间潜力.
- 使用密度函数理论 (DFT) 模拟生成的综合数据库来训练MTP.
- 包括各种结构:晶体,点缺陷,扩展缺陷和无序配置.
主要成果:
- 开发的MTP成功地描述了Si/SiO2/O系统中的原子间相互作用.
- 该模型在广泛的静态和动态原子结构中表现出高精度.
- 性能接近于对各种Si,O和SiO2配置的DFT计算的忠实性.
结论:
- 一个统一的MTP框架为Si和SiO2的建模提供了一种高效和准确的方法.
- 这种机器学习潜力与初始方法相比,大大降低了计算成本.
- 该模型适用于探索Si/SiO2系统中的各种材料特性和现象.
相关概念视频
Moment of a Force: Scalar Formulation
724
The moment of a force, also known as torque, measures the ability of the force to create rotational motion in a body about an axis. It is a vector quantity, meaning it has both magnitude and direction. This concept is used extensively in engineering, physics, and mechanics.
Consider a simple example of a flywheel being rotated about a point, O, by applying a force to it. In this case, the moment arm is the perpendicular distance between the point O and the line of action of the force. The...
Consider a simple example of a flywheel being rotated about a point, O, by applying a force to it. In this case, the moment arm is the perpendicular distance between the point O and the line of action of the force. The...
724
Moment of a Force About an Axis: Scalar
349
The moment of a force about an axis is a crucial concept in mechanics that helps determine an object's rotational motion around a specific point or axis. The moment of force can be calculated using scalar analysis, which involves considering the perpendicular distance between the axis of rotation and the line of action of the force or simply the moment arm.
To better understand the concept of moment of force, consider the example of a cyclist riding a bicycle. When the cyclist applies force...
To better understand the concept of moment of force, consider the example of a cyclist riding a bicycle. When the cyclist applies force...
349
Moment-of-Momentum Equation
90
The moment-of-momentum equation is a critical tool for analyzing the torque produced by the rotating blades of a wind turbine. This equation is derived by applying Newton's second law to a fluid particle, which states that the rate of change of linear momentum is equal to the external force acting on the particle.
90
Singularity Functions for Bending Moment
205
Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented...
205
Moment of Inertia of Compound Objects
6.1K
The moment of inertia is a quantitative measure of the rotational inertia of an object. It is defined as the sum of the products obtained by multiplying the mass of each particle of matter in a given body by the square of its distance from the axis. The total moment of inertia for compound objects can be found by determining and adding the moment of inertia of individual components together.
Consider a child of mass (mc) 25 kg standing at a distance (rc) of 1 m from the axis of a rotating...
Consider a child of mass (mc) 25 kg standing at a distance (rc) of 1 m from the axis of a rotating...
6.1K
Potential Due to a Polarized Object
370
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
370


