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関連する概念動画

Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
Partial Differential Equations01:21

Partial Differential Equations

A stone dropped into a still pond generates waves that propagate outward in circular patterns, creating a dynamic surface whose elevation depends on both position and time. At any given location, the water level oscillates as the wave passes, while at any fixed moment, the surface exhibits smooth, curved structures extending across space. This dual dependence requires a mathematical description that accounts for variation in multiple variables simultaneously.At a fixed point on the water...
Velocity Potential01:20

Velocity Potential

In steady, incompressible flow through a long, straight pipe with a uniform cross-section, the flow in the central region (far from the pipe walls) is irrotational. This irrotational nature means that fluid particles do not rotate around their axes, and a scalar function called the velocity potential, represented by ϕ, can be used to describe their movement. In irrotational flows, the velocity field V is defined as the gradient of the velocity potential:
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Gauss's Law: Spherical Symmetry01:26

Gauss's Law: Spherical Symmetry

A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half has a uniform...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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関連する実験動画

Updated: Jun 28, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

周期的および非対称的なポテンシャルにおける表面拡散運動.

Greg Pawin1, Kin L Wong, Ki-Young Kwon

  • 1Pierce Hall, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|October 29, 2008
PubMed
まとめ

銅表面での9,10-ディチオアントラセンの拡散は,驚くべき対称性を明らかにします. 非対称メチル化は,拡散速度を変化させるが,運動対称性を変化させず,古典的な粒子行動に挑戦し,顕微鏡の可逆性を視覚化する.

科学分野:

  • 表面科学とは,地表科学のことである.
  • 物理化学 物理化学とは
  • ナノスケールのダイナミクス

背景:

  • 表面上の分子拡散を理解することは,触媒と材料科学にとって極めて重要です.
  • 顕微鏡の可逆性の原理は,均衡状態にあるシステムの統計的振る舞いを支配する.
  • ナノスケールのダイナミクスを視覚化することで,基本的な物理原理の直接的な洞察が得られます.

研究 の 目的:

  • 9,10-ジジオアントラセンの拡散ダイナミクスをCu{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu} ,{\displaystyle Cu}) の表面上で調査するために
  • 分子拡散に対する縮小対称性の効果とその基礎となる原理を探求する.
  • 顕微鏡の可逆性原理の単一分子スケールの可視化を提供するために.

主な方法:

さらに関連する動画

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

関連する実験動画

Last Updated: Jun 28, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

Finite Element Modelling of a Cellular Electric Microenvironment

Published on: May 18, 2021

  • 9,10-ジジオアントラセンは,Cu ((111)) 基板に吸収される.
  • システムの対称性を減らすために分子の非対称メチル化.
  • 拡散を観察するための高解像度表面顕微鏡技術.
  • 拡散の障壁と速度を分析するための計算モデリング.

    • 主要な成果:

    • 9,10-ディチオアントラセンは,Cu上での高対称性軸に沿って拡散する.
    • 非対称メチル化は,拡散速度を100倍減らし,拡散バリアを非対称にしました.
    • 分子運動の対称性は,システムの非対称性にもかかわらず,変化しませんでした.
    • 観測されたダイナミクスは,古典的な粒子拡散の期待に異議を唱える.

    結論:

    • 分子拡散対称性は,システム対称性が低下した状態でも維持できます.
    • この研究は,顕微鏡の可逆性原理の直接的な単一分子可視化を提供します.
    • 発見は,ナノスケール拡散の量子力学的な性質と,基本的な物理学への影響を強調しています.