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Wet Beveling of Microinjection Needles Utilizing Constant Air Pressure for Feedback on Needle Opening06:00

Wet Beveling of Microinjection Needles Utilizing Constant Air Pressure for Feedback on Needle Opening

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This protocol describes the assembly of a pneumatic system for the delivery of pressurized air to a needle during the process of needle beveling. The protocol further describes the beveling process for creating sharp microinjection needles and how to gauge the relative opening size of the...
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This protocol demonstrates in detail how to perform fully endoscopic mitral valve surgery (EMS) with percutaneous cannulation of the groin vessels, using a percutaneous plug-based vascular closure device. Fundamental steps and useful instructions are described in detail for each step.
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This "two-step method" significantly improved the success rate of percutaneous transhepatic choledochoscopy and achieved a better prognosis of intrahepatic and extrahepatic...
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脱位多连接和应变硬化

Vasily V Bulatov1, Luke L Hsiung, Meijie Tang

  • 1Lawrence Livermore National Laboratory, University of California, Livermore, California 94550, USA. bulatov1@llnl.gov

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 固体力学 固体力学是什么

背景情况:

  • 晶体强度由位移的行为来决定,这些是线形缺陷.
  • 现有的理论解释了通过位相互作用形成结点的应变硬化.
  • 复杂的,多位移相互作用在晶体强化的作用仍然不太了解.

研究的目的:

  • 为了研究由三个位移之间的相互作用形成的拓元素.
  • 了解这些新型结构对晶体可塑性和强度的影响.
  • 阐明这些相互作用在晶体应力硬化中的作用.

主要方法:

  • 模拟失位动力学以预测新的拓元素.
  • 原子模拟用于分析纳米尺度上的缺陷行为.
  • 传输电子显微镜用于实验验证单晶中的模拟结果.

主要成果:

  • 识别和预测"多个连接点",一种新型的异位网络拓.
  • 多个连接处作为位运动的强大障碍和位增殖的来源.
  • 在变形的晶体中实验证实多连接.

结论:

  • 多个结点显著影响脱位微观结构的演变和晶体强度.
  • 这些结构负责在以身体为中心的立方体晶体中观察到的取决于方向的应变硬化.
  • 这些发现为晶体的可塑性和强化机制提供了新的视角.