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関連する概念動画

Travelling Waves01:04

Travelling Waves

5.9K
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Equations of Wave Motion01:02

Equations of Wave Motion

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Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a period T. The wave on the string is sinusoidal and is translated in the positive x-direction as time progresses. Sine is a function of the angle θ, oscillating between +A and −A and repeating every 2π radians. To construct a wave model, the ratio of the angle θ and the position x is considered.
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Reflection of Waves01:07

Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

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メキシコの波は,興奮しやすい媒体で.

I Farkas1, D Helbing, T Vicsek

  • 1Department of Biological Physics, Eötvös University Budapest, 1117 Budapest, Hungary.

Nature
|September 13, 2002
PubMed
まとめ
この要約は機械生成です。

集団的な人間の行動であるメキシコの波は,興奮しやすいメディアの原則を用いてモデル化されています. この研究は,群衆の波がどのように引き起こされるかを説明し,大規模なグループイベントを管理するための洞察を提供します.

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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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科学分野:

  • 集団的な人間の行動 集団的な人間の行動
  • 複雑なシステムのモデリング
  • 社会的ダイナミクス

背景:

  • メキシコの波 (La Ola) は,1986年のワールドカップに由来する有名な観客の現象です.
  • それは,スタジアムの観客の同期した,連続したアクティベーションを伴う.
  • このような集団的行動を理解することは困難です.

研究 の 目的:

  • メキシコ波の集団的な人間の行動を解釈し,定量化するために.
  • 興奮しやすいメディアのモデルを適用して群衆の動態を理解する.
  • 群衆の波を刺激し,潜在的に制御する方法を調査する.

主な方法:

  • 元々は興奮しやすい媒介 (例えば心臓組織) のために開発されたモデルの変形を使用した.
  • 波の開始を試みた観客の反応をモデル化した.
  • 群衆を介して波の伝播のダイナミクスを定量化しました.

主要な成果:

  • 刺激媒体の原理を用いてメキシコ波を成功裏にモデル化した.
  • 波の発生と拡散を刺激する重要な要因とメカニズムを特定した.
  • 波を誘発する試みに対する群衆の反応を予測する可能性を実証した.

結論:

  • メキシコ波は,刺激可能なメディア理論を用いて効果的に理解し,モデル化することができます.
  • このモデリングアプローチは,集団的な人間の行動の刺激に関する洞察を提供します.
  • 発見は,大きな興奮したグループを含むイベントの管理と制御に適用することができます.