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関連する概念動画

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

15.2K
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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Upward Impending Motion01:21

Upward Impending Motion

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
361
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.3K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.3K
Frictional Forces on Screws01:17

Frictional Forces on Screws

1.3K
Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
1.3K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.7K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.7K
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

233
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
233

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関連する実験動画

Updated: Sep 10, 2025

The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress

Published on: October 31, 2016

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フォース・インダクション・リング・フリッピング・イン・ザ・スレッド・ピラー [1] アレネ

Lei Chen1, Tomás Nicolás-García1, Igor Rončević1

  • 1Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.

Angewandte Chemie (International ed. in English)
|August 26, 2025
PubMed
まとめ
この要約は機械生成です。

機械的な力は,ピラー[5]アレーンの形状を制御し,挑戦的な構造にアクセスすることができます. この制御された反転は 機械的なダッパーとして機能し 材料の頑丈さを高めます

キーワード:
フリッピング機械的な力ピラーアレン[5]ロタキサン止められない

さらに関連する動画

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
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A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

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関連する実験動画

Last Updated: Sep 10, 2025

The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
09:20

The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress

Published on: October 31, 2016

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A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
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A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

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科学分野:

  • 超分子化学
  • 材料科学
  • 機械化学

背景:

  • ピラー[n]アレンは,独特の宿主-ゲスト特性と,特定の形状による平面性を持つ多機能マクロサイクルである.
  • 中間形状の制御は,ピラー[n]アーレンの単一の反転リングのように,合成的に困難です.

研究 の 目的:

  • 柱の形状を制御するための機械力の使用を調査する.
  • パイラー[5]アレン基ロタキサンにおける単一ヒドロキノン環の力誘発の反転を調査する.
  • ロタキサン成分とピラーレンの置換剤が,この反転運動に及ぼす影響を理解するためです.

主な方法:

  • メカノケミアを使用して,ピラー[5]アレンベースのロタキサンに制御された力を適用した.
  • ストップと軸の設計が反転ダイナミクスに与える影響を調査した.
  • 構成変化に対する柱[5]アレン置換物の影響を分析した.

主要な成果:

  • パイラー[5]アレン・ロタキサンにおける単一のヒドロキノン環の力誘発の反転が示され,難解な形状に到達した.
  • ロタキサン構造とピラーレンの置換剤によって 逆転運動の制御を示した.
  • 圧力の下でのポリマー分裂を遅らせる 機械的なダッピングメカニズムとして

結論:

  • 機械的な力は 合成的に挑戦的な 超分子構造への新しい経路を提供します
  • 力の誘発による反転メカニズムは 機械的なダッパーとして機能し,より硬い材料を作る可能性を秘めています.