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ブラウン運動を振動流動化粒状物質で観測した
1Institut de Physique de la Matière Complexe, Faculté des Sciences de Base, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. gianfranco.danna@epfl.ch
Nature
|August 22, 2003
まとめ
研究者は,振動流体化された粒状物質のトルション振動器を使用して非均衡システムを調査しました. 驚くべきことに,このシステムは,ブラウン運動に類似して,波動-消散関係を満たし,熱浴のように作用した.
科学分野:
- 統計力学 統計力学とは
- 粒子の物理学 粒子の物理学
- 非均衡システムとは
背景:
- ガスにおけるブラウン運動は,粘度や温度などの均衡状態の統計力学の概念につながった.
- ランゲヴィンモデルと変動分散定理は,これらの均衡現象を説明する.
- これらの考え方を非均衡システムに拡張することは,まだ未解決の問題である.
研究 の 目的:
- 均衡の統計力学形式主義が駆動された非均衡の粒子のシステムを記述できるかどうかを調査する.
- 浸水振動器のための熱浴の類似体として,ビブロ流体化された粒状介質を実験的に探査する.
主な方法:
- 外部振動によって流動化される粒状システムに浸された敏感なトルション振動器を用いた実験.
- 騒音の測定と振動器の感受性の測定.
- 均衡の統計力学の概念を用いた分析.
主要な成果:
- 振動流体化された粒状介質は,非均衡システムであるにもかかわらず,均衡形式主義によって近似することができます.
- 粒子の粘度と有効温度への実験的アクセスが達成されました.
- これらの粒状の性質は,アニソトロプ的で不均一であることが判明しました.
- 粒状のシステムは,驚くほど,波動と消散の関係を満たした.
結論:
- 変動分散定理を含む均衡の統計力学の概念は,一定の非均衡の粒子のシステムを記述するために拡張することができます.
- 振動流体化された粒状物質は,効果的な"熱"風呂として機能します.
- これは,非均衡現象と均衡概念との関連を研究するための新しい実験的道筋を提供します.
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