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相关概念视频

Newton's First Law: Application01:12

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Experience suggests that an object at rest remains at rest if left alone, and that an object in motion tends to slow down and stop unless some effort is made to keep it moving. However, Newton's first law gives a deeper explanation of this observation. The study of Newton's laws is like recognizing patterns in nature from which further patterns can be discovered. The genius of Galileo, who first developed the idea for the first law of motion, and Newton, who clarified it, was to ask the...
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Newton's Second Law00:55

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Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same...
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Newton's Third Law: Introduction00:58

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Whenever one body exerts a force on a second body, the first body experiences a force equal in magnitude and opposite in direction, to the force that it exerts. For instance, when a person pushes on a wall, the wall exerts an equal and opposite force towards the person. This brings us to Newton's third law of motion. Newton's third law represents a certain symmetry in nature: Forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
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Newton's third law states that every action has an equal and opposite reaction. Consider a swimmer pushing off the side of a pool. They push against the wall of the pool with their feet and accelerate in the direction opposite to that of their push. This occurs because the wall exerts an equal and opposite force on the swimmer. Here, the forces do not cancel out each other as they are acting on different systems. In this case, there are two systems: the swimmer and the wall. If we select...
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Our everyday observation tells us that all objects close to the Earth naturally tend to fall to the ground. Early philosophers assumed that this downward force was unique to Earth. By the 16th century, Nicolaus Copernicus (1473-1543) put forward the heliocentric theory, which suggested that Earth and other planets orbited the sun, while the Moon orbited the Earth. However, it was Isaac Newton (1642-1727) who linked these two motions together in the 17th century. He reasoned that the force of...
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When we observe objects around us, one question that comes to mind is why they move or stay still. The answer to this question can be explained using Newton's laws of motion. These laws describe the fundamental principles of motion and the effects of forces on objects.
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Mechanical Manipulation of Neurons to Control Axonal Development
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一个量子牛顿的摇篮.

Toshiya Kinoshita1, Trevor Wenger, David S Weiss

  • 1Department of Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802, USA.

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|April 14, 2006
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概括
此摘要是机器生成的。

研究人员通过实验证明,一维的斯气体无法达到热平衡,这挑战了统计力学假设. 在多体系统中这种非ergodic行为为量子技术开辟了新的途径.

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科学领域:

  • 统计力学 统计力学
  • 量子气体是一种量子气体.
  • 多体物理多体物理

背景情况:

  • 统计力学假定具有多个自由度的系统可以在ergodically样本相位空间,达到热平衡.
  • 不能热化的非厄尔戈迪系统对于理解这一基本假设的局限性至关重要.
  • 以前的研究提出了具有可整合动态的复杂系统作为非ergodic,但缺乏实验证据.

研究的目的:

  • 实验性地研究多体量子系统的ergodicity和热化.
  • 探索偏离统计力学标准假设的系统.
  • 提供第一个多自由度系统的实验演示,该系统不接近热平衡.

主要方法:

  • 准备被困的一维 (1D) 斯气体的不平衡阵列.
  • 使用卢比-87 ((87) Rb) 原子,每个气体含有40到250个原子.
  • 在数千次碰撞中观察这些系统的时间演变,以评估平衡.

主要成果:

  • 准备的单维斯气体没有表现出明显的平衡,即使经过长时间.
  • 观察到的非ergodic行为与已知的可整合性一致 1D 波兹同质气体与点状相互作用.
  • 这种实验结果解决了在现实条件下1D波斯气体时间演变的未解决的理论问题.

结论:

  • 该实验提供了第一个在多体量子系统中非热化动态的直接证据.
  • 这些发现验证了关于1D斯气体的可整合性及其偏离ergodicity的理论预测.
  • 这些一维斯气体中没有减压,这表明它们在精密测量技术 (如力传感和原子干扰计) 中具有潜在的应用.