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関連する概念動画

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Angle of Twist - Elastic Range01:13

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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In the case of stringed instruments like the guitar, the elastic property that determines the speed of the sound produced is its linear mass density or the mass per unit length. This is simply called the linear density. If the string's linear density is constant along the string, then the linear density is simply the total mass divided by the total length.
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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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双層グラフェンのチューニング超伝導性

Matthew Yankowitz1, Shaowen Chen1,2, Hryhoriy Polshyn3

  • 1Department of Physics, Columbia University, New York, NY 10027, USA.

Science (New York, N.Y.)
|January 26, 2019
PubMed
まとめ

研究者は圧力で層の距離を調整することで ねじれた二層グラフェンの超伝導性を調整しました この調節可能な物質で 奇異な量子状態を 探求する新しい方法が 明らかになりました

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科学分野:

  • 凝縮物質物理学
  • 量子材料科学

背景:

  • 物質の平らな電子帯は 強い電子相関関係により 奇異な量子現象を引き起こします
  • 特定の回転角度 (1.1°) の双層グラフェン (TBG) は,ゲート調節可能な超伝導と相関する絶縁相を示す.

研究 の 目的:

  • TBGにおける超伝導と相関する絶縁相の調節性を調査する.
  • 電子相の制御における 単なる回転角度を超えた 層間結合の役割を探求する

主な方法:

  • 歪んだ二層グラフェン装置の製造
  • 水位圧力を加え,層間の距離とコップリングを変化させる.
  • ゲート電圧と圧力による電子相の調節.

主要な成果:

  • 超伝導性は,相関相が通常存在しない 1.1 度以上の回転角度で,水静圧を適用することによって誘導された.
  • 圧力による層間距離の変動により,超伝導と絶縁相の正確な調節が可能になった.
  • 詳細な超伝導相図がマッピングされ,隣接する絶縁状態に関連して分析されました.

結論:

  • 層間のカップリングは,TBGにおける相関電子状態のチューニングの重要なパラメータであり,トウィスト・アングルに沿っています.
  • 水位圧はTBGにおける超伝導性と関連する現象を設計するための新しい方法を提供します.
  • 双層グラフェンは 相互関係のある量子状態に関する 基礎研究のための 非常に多用途なプラットフォームとして機能しています