Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

363
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
363
Ampere's Law in Matter01:22

Ampere's Law in Matter

848
The total current density in magnetized material is the sum of the free and bound current densities. The free current arises due to the motion of free electrons within the material, while the bound current arises due to the alignment of magnetic dipole moments.
The differential form of Ampere's law in vacuum states that the curl of the magnetic field equals the permeability times the current density. In a magnetized material, the law is modified to incorporate the free and bound current...
848
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

1.9K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
1.9K
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

4.2K
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
4.2K
Self-Inductance01:24

Self-Inductance

2.5K
Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would...
2.5K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

3.2K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
3.2K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Oxidation-induced σ-aromaticity in halogenated cycloalkanes.

Physical chemistry chemical physics : PCCP·2025
Same author

Oxidation-induced double aromaticity in periodo-polycyclic hydrocarbons.

Chemical science·2025
Same author

Unraveling the Bonding and Aromaticity of Pentazole, Pentaphosphole, and Cyclopentadiene Anions: A Comprehensive Study.

Journal of the American Chemical Society·2024
Same author

On the Unusual Global Aromaticity of Two Cyclopenta-Ring-Fused Oligo(m-Phenylenes).

Chemphyschem : a European journal of chemical physics and physical chemistry·2024
Same author

Effect of Benzo-Annelation on Triplet State Energies in Polycyclic Conjugated Hydrocarbons.

Chemistry (Weinheim an der Bergstrasse, Germany)·2024
Same author

3,4-Dimethylenecyclobutene: A Building Block for Design of Macrocycles with Excited State Aromatic Low-Lying High-Spin States.

Chemistry (Weinheim an der Bergstrasse, Germany)·2024

相关实验视频

Updated: Sep 19, 2025

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

4.9K

磁诱导电流密度:一个半经验方法.

Slavko Radenković1, Slađana Đorđević1

  • 1Faculty of Science, University of Kragujevac, P.O. Box 60, Kragujevac 34000, Serbia. slavkoradenkovic@kg.ac.rs.

Physical chemistry chemical physics : PCCP
|June 18, 2025
PubMed
概括

这项研究优化了半经验方法来计算分子中的电流密度. 修改后的NDDO方法可以降低磁性属性计算的计算成本,同时保持精度.

科学领域:

  • 计算化学是一种计算化学.
  • 量子化学是一种量子化学.
  • 理论化学是一种理论化学.

背景情况:

  • 精确计算磁诱导电流密度对于理解分子电子结构和芳香度至关重要.
  • 半经验方法为电子结构计算的ab initio方法提供了一个计算效率高的替代方案.

研究的目的:

  • 在CTOCD-DZ框架内评估各种基于NDDO的半实证方法的性能,用于计算电流密度.
  • 建议和评估对基于NDDO的方法进行修改,以减少计算成本.

主要方法:

  • 使用了CTOCD-DZ (电流密度-磁性零源的连续转换) 方法.
  • 采用了各种基于忽视二原子差异重叠 (NDDO) 近似的半实证方法.
  • 对比结果与类碳化合物的B3LYP/def2-SVP参考.

主要成果:

  • 评估了基于NDDO的不同方法计算磁诱导电流密度的准确性.
  • 证明了基于NDDO的修改方法可以显著减少计算时间.
  • 表明修改后的方法保持了与原始方法可比的准确性.

结论:

  • 基于NDDO的半实证方法可用于计算电流密度.

更多相关视频

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
04:35

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Published on: July 5, 2024

2.1K
Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

5.8K

相关实验视频

Last Updated: Sep 19, 2025

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

4.9K
Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
04:35

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

Published on: July 5, 2024

2.1K
Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

5.8K
  • 对这些方法的修改可以在不牺牲准确性的情况下大幅提高计算效率.
  • 开发的方法为研究分子的磁性特性提供了更快的途径.