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Impact: Problem Solving01:26

Impact: Problem Solving

615
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
615
Distance Measurements by Taping01:18

Distance Measurements by Taping

710
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Distance Problem01:29

Distance Problem

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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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カジミール・リフシッツの長距離反撃力を測定した.

J N Munday1, Federico Capasso, V Adrian Parsegian

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|January 9, 2009
PubMed
まとめ

研究者は,材料間の相互作用を魅力から反発へと変化させる,排斥的なカジミール-リフシッツ力を実証しました. この発見は,量子レビテーションと新しいナノスケールデバイスの可能性を開きます.

科学分野:

  • 物理 物理学 物理学とは
  • 量子力学は,量子力学という
  • 表面科学とは,地表科学である.

背景:

  • 量子変動は,短距離でのヴァン・デル・ワールズの力を含む分子間力を発生させます.
  • より大きな距離では,これらの力は,カシミール,ポルダー,リフシッツの理論で説明されているように,光の速度が有限であるため,遅延効果を発揮します.
  • これまでに,物質体の間のカジミール・リフシッツ力の吸引力だけが実験的に測定されていた.

研究 の 目的:

  • カジミール・リフシッツ力の反発の可能性を実験的に実証する.
  • 材料の選択と浸水液がこれらの力のサインと大きさに与える影響を調査する.
  • 調節可能なカシミール-リフシッツ力の潜在的応用を探求する.

主な方法:

  • 液体に浸されたマクロスコピック体の間の力の実験的測定.
  • 相互作用する材料と表面分離の体系的な変化.
  • カジミール-リフシッツ相互作用の理論的予測と実験結果の比較.

主要な成果:

  • 適切な相互作用する材料を選択することによって,カジミール・リフシッツの排斥力を成功裏に実証しました.
  • 類似の分離では,排斥力が吸引力よりも弱いことが観察されました.

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関連する実験動画

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  • 表面分離が減少するにつれて,吸引力と排斥力の大きさが増加することを確認しました.
  • 結論:

    • カジミール・リフシッツ力のサインは制御可能で,反発的な相互作用を可能にします.
    • 排斥的なカジミール-リフシッツ力は,流体における量子浮揚の可能性を提供します.
    • この研究は,超低静的摩擦を持つ切り替え可能なナノスケールデバイスへの道を開く.