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相关概念视频

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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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...
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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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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.
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Design of Transmission Shafts01:16

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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...
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Chair Conformation of Cyclohexane02:02

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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.
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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...
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Experimental Procedure for Warm Spinning of Cast Aluminum Components
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一个形状持久的聚烯轮

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
概括
此摘要是机器生成的。

研究人员合成了一种新型的"有光轮"聚烯分子, 这一发现为具有独特多孔结构的先进材料开辟了道路.

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科学领域:

  • 有机化学
  • 材料科学
  • 纳米技术

背景情况:

  • 聚烯合成在实现精确的分子架构方面存在挑战.
  • 二维 (2D) 材料具有独特的电子和机械性能.
  • 复杂有机分子的控制合成对于开发先进材料至关重要.

研究的目的:

  • 合成一个形状持久的聚烯具有独特的"轮"结构.
  • 开发一种名为石的新型二维聚烯材料.
  • 展示一个创建复杂模板聚烯架构的方法.

主要方法:

  • 一个二替代的树突型聚烯前体的六重分子内山本合.
  • 使用中央六基单元作为分子组装模板.
  • 使用核磁共振 (NMR) 光谱和矩阵辅助激光离子飞行时间质谱 (MALDI-TOF MS) 进行表征.

主要成果:

  • 一个形状持久的聚烯的成功合成与一个独特的"轮"结构.
  • 通过光谱和质谱技术明确确认该分子的结构 (分子质量:3815.4 g/mol).
  • 扫描道显微镜 (STM) 的可视化清楚地描绘了带有六个内部孔的螺旋轮结构.

结论:

  • 这项研究首次合成了一种新的二维聚烯.
  • 这种"轮"聚烯具有精确的结构控制和形状持久性.
  • 这些发现为开发各种领域的新型有机材料铺平了道路.