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相关概念视频

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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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...
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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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相关实验视频

Updated: May 26, 2025

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对穿越弱区的双盾TBM进行数值模拟方法.

Zhiwen Wang1,2, Meng Wei3,4, Yang Liu1,2

  • 1State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu, 610059, China.

Scientific reports
|February 21, 2025
PubMed
概括
此摘要是机器生成的。

双盾道钻机 (DS TBM) 中的机器堵塞是一个主要的操作挑战. 本研究开发了一个数值模拟来量化阻塞风险,提高TBM的安全性和效率.

关键词:
深埋的道深埋的道双盾 TBM 是一个双盾 TBM.数字模拟 数字模拟在TBM中阻塞.弱势地区 弱势地区

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科学领域:

  • 地质技术工程 地质技术工程
  • 道技术 道技术
  • 机械工程 机械工程

背景情况:

  • 机器阻塞,特别是屏蔽和切头阻塞,阻碍了双盾道钻机 (DS TBM) 的运行.
  • 周围岩石的变形和崩是DS TBM阻塞的主要原因.
  • 准确量化干扰因素对于安全和高效的道开通至关重要.

研究的目的:

  • 开发和验证用于评估DS TBM干扰的数值模拟方法.
  • 调查DS TBM中推力阻力和切头扭矩的计算方法.
  • 在道开挖过程中提供对潜在干扰的定量评估.

主要方法:

  • 在FLAC3D中开发了一个有限差异模型,用于DS TBM在岩石中挖掘弱区的岩石.
  • 将周围岩石,TBM切头和盾牌之间的相互作用纳入模型.
  • 创建了一个Python程序来提取压力数据用于定量干扰风险评估.

主要成果:

  • 数字模拟方法准确量化了周围岩石条件对DS TBM阻塞的影响.
  • 压力数据的提取使得可以精确评估盾牌和切头阻塞潜力.
  • 该方法通过在DXL道中使用现实世界的屏蔽干扰事件来验证.

结论:

  • 拟议的数值模拟方法准确且适用于预测和减轻DS TBM干扰.
  • 这种方法增强了对岩石-TBM相互作用的理解,从而提高了道安全.
  • 对干扰因素的定量分析支持优化DS TBM操作策略.