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関連する概念動画

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

514
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
514
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

631
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...
631
Mass Moment of Inertia: Problem Solving01:13

Mass Moment of Inertia: Problem Solving

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Knowing how to determine the moment of inertia in a wheel's axle can be invaluable in engineering and automotive applications. It provides an understanding of how changes in geometry, mass, and radius can impact its performance.
The axle can be approximated to a solid cylinder with longitudinal and perpendicular axes. Initially, a thin disc is considered parallel to the circular face of the cylinder.
740
Design of Transmission Shafts01:16

Design of Transmission Shafts

854
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
854
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

20.4K
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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Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

538
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
538

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Experimental Procedure for Warm Spinning of Cast Aluminum Components
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形 を 変えない ポリフェニレン の スポーク の 輪

Yi Liu1, Akimitsu Narita1, Joan Teyssandier2

  • 1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.

Journal of the American Chemical Society
|December 10, 2016
PubMed
まとめ
この要約は機械生成です。

研究者たちは新しい2次元材料である グラフェニレン の重要な構成要素である 新しい"スピークド・ホイール"ポリフェニレン 分子を合成しました この発見により 独特の多孔構造を持つ 高度な材料の開発が 可能になりました

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科学分野:

  • 有機化学
  • 材料科学
  • ナノテクノロジー

背景:

  • ポリフェニレン合成は,正確な分子構造を達成する上で課題を提示します.
  • 二次元 (2D) 材料は独特の電子的,機械的な性質を持っています.
  • 複雑な有機分子の 制御された合成は 先進的な材料の開発に不可欠です

研究 の 目的:

  • 形状に固有のポリフェニレンを 合成する
  • グラフェニレンという新しい二次元ポリフェニレン材料のサブユニットを開発する.
  • 複雑でテンプレート化されたポリフェニレンアーキテクチャを作成する方法を実証する.

主な方法:

  • ドデカブロム置換型デンドリート型ポリフェニレン前駆体による6倍内分子ヤマモト結合
  • 中央ヘキサフェニルベンゼンユニットを分子組み立てのテンプレートとして使用する.
  • 核磁共振 (NMR) スペクトロスコーピーとマトリックスアシストレーザーイオン化飛行時間質量スペクトロメトリ (MALDI-TOF MS) を使用した特徴付け.

主要な成果:

  • 形状に固有のポリフェニレンと 独特の"スパイクホイール"構造の合成が成功しました
  • 分子の明確な構造確認 (モラー質量:3815.4g/mol) は,スペクトロスコープと質量スペクトロメトリー技術によるものである.
  • スキャニング・トンネル顕微鏡 (STM) の可視化では,内部に6つの毛穴を持つスピーク状の車輪構造がはっきりと描かれています.

結論:

  • この研究は,グラフェニレンサブユニットである新しい2Dポリフェニレンの最初の合成を示しています.
  • "スピークホイール"ポリフェニレンは,正確な構造制御と形状の持続性を示しています.
  • この発見は,様々な分野で応用可能な新しい多孔性の有機材料の開発に道を開きます.