在二维多态机械超材料中的相位过渡是通过单子类脉冲的碰撞来实现的
Weijian Jiao1,2, Hang Shu1, Vincent Tournat3
1Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA.
Nature communications
|January 6, 2024
概括
机械元材料中单子类脉冲的碰撞触发了相位过渡. 这些过渡,类似于晶体固体,如果达到关键核大小,则以波形式传播,从而可以控制相位形成.
科学领域:
- 固体力学 固体力学是什么
- 材料科学 材料科学 材料科学
- 非线性动力学是一种非线性动力学.
背景情况:
- 机械超材料表现出复杂的非线性波浪现象.
- 多稳定元材料具有多个稳定状态,使其具有独特的动态行为.
研究的目的:
- 为了研究二维多稳定的机械超材料中的相位过渡.
- 探索单子类脉冲碰撞在启动这些过渡过程中的作用.
主要方法:
- 在机械超材料中对相变的实验观测.
- 使用实验验证的模型进行数值模拟.
- 对非线性波传播和单子碰撞的分析.
主要成果:
- 多稳定元材料中的相位过渡是由单子类脉冲碰撞启动的.
- 如果新阶段超过了关键核大小,则会发生过渡.
- 非线性脉冲的取决于方向的行为控制着核和相形状.
结论:
- 单子碰撞可以形成机械元材料中相变的关键核.
- 这提供了一种通过非线性波相互作用控制相位过渡的机制.
相关概念视频
01:28Standing Waves in a Cavity
927
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
927
01:12Double Resonance Techniques: Overview
213
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
213