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相关概念视频

Gauss's Law01:07

Gauss's Law

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If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
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Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
829
Hydrogen Bonds00:26

Hydrogen Bonds

120.6K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

41.9K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Calculating Standard Free Energy Changes02:49

Calculating Standard Free Energy Changes

20.6K
The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
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Updated: May 31, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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使用高斯过程回归预测原子转移能量障碍.

Evgeni Ulanov1,2, Ghulam A Qadir1, Kai Riedmiller1

  • 1Heidelberg Institute for Theoretical Studies Heidelberg Germany evgeni.ulanov@h-its.org ghulam.qadir@h-its.org frauke.graeter@h-its.org.

Digital discovery
|January 24, 2025
PubMed
概括
此摘要是机器生成的。

高斯过程回归 (GPR) 使用有限密度函数理论 (DFT) 数据有效预测反应障碍. 这种数据效率高的方法准确地模拟了蛋白质等复杂系统中的化学反应性.

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相关实验视频

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科学领域:

  • 计算化学是一种计算化学.
  • 材料科学是一种材料科学.
  • 生物化学 生物化学

背景情况:

  • 预测反应障碍对于催化剂设计和模拟复杂材料中的反应至关重要.
  • 目前的方法通常需要广泛的密度函数理论 (DFT) 计算,限制效率.

研究的目的:

  • 引入高斯过程回归 (GPR) 作为预测反应障碍的数据有效方法.
  • 为了评估GPR在蛋白质中原子转移反应的性能.

主要方法:

  • 使用高斯过程回归 (GPR) 与SOAP描述符和边缘化图核.
  • 将GPR性能与基于图形神经网络的模型进行比较.
  • 专注于具有数百到数千个DFT障碍计算的数据集.

主要成果:

  • 在蛋白质中的原子转移障碍物中达到3.23 kcal mol-1的平均绝对误差.
  • 证明了蛋白质复杂化学和结构空间中的反应障碍的可靠估计.
  • GPR模型显示了与图形神经网络相似的预测能力,在低数据场景中表现优于它们.

结论:

  • 高斯过程回归 (GPR) 为近似化学反应率提供了一种有价值,数据效率高的方法.
  • GPR适用于复杂和可变环境中的反应建模,特别是当DFT数据有限时.
  • 这种方法提高了催化剂设计和材料和生物系统中的反应模拟的效率.