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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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Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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Pivot Bearings01:23

Pivot Bearings

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In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...
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Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Updated: Mar 15, 2026

Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound
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トリプルスレッド [4]ロタキサン

Jonathan J Danon1, David A Leigh1,2, Paul R McGonigal2

  • 1School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.

Journal of the American Chemical Society
|August 30, 2016
PubMed
まとめ
この要約は機械生成です。

研究者は,金属テンプレート合成を使用して,単一のリングを通して3つの軸をスレッドした複雑な [4] ロタキサンを合成した. より大きなマクロサイクルはより複雑なロタキサンを生み出し,分子組立におけるテンプレート制御を示した.

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科学分野:

  • 超分子化学
  • 有機合成

背景:

  • ロタキサンはナノテクノロジーの応用が可能な 機械的に結合した分子です
  • テンプレートによる合成は,複雑な分子構造を構築するための重要な戦略です.

研究 の 目的:

  • 単一のマクロサイクルリングを通過する複数の軸を持つ新型 [4]ロタキサンを合成し,特徴づけること.
  • ロタキサン形成に対するマクロサイクルの大きさの影響を調査する.

主な方法:

  • 活性金属模板合成は,ニッケル触媒 sp 〜 sp 〜 3 ホモカップリングを使用します.
  • アルキルブロミド"半糸"と2,2':6',2"-テルピリジルマクロサイクルの製造
  • 核磁共振 (NMR) スペクトロスコーピーと質量スペクトロメトリを用いた製品の特徴付け

主要な成果:

  • 37と38のマクロサイクルの使用で最大11%の収穫量でトリプルスレッド [4]ロタキサンを合成した.
  • 同じような条件下では,39個のマクロサイクルでロタキサン製品が形成されませんでした.
  • 二重糸状 [3] ロタキサンも得られ,より大きなマクロサイクルの軸滑りの可能性を示した.

結論:

  • マクロサイクルの大きさは,高度にスレッドされた [4] ロタキサンのテンプレート合成の成功に不可欠である.
  • 結果は,より大きなマクロサイクルは,脱金属化後に軸の滑り方を許し,スレッドが少ない種の分離を防ぐことを示唆しています.