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相关概念视频

Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Electromagnetic Waves01:30

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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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相关实验视频

Updated: Sep 19, 2025

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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用相对论电磁冲击进行质子加速.

Ting Xiao1, Xiaomei Zhang1, Fanqiu Kong1

  • 1Department of Physics, Shanghai Normal University, Shanghai, 200234, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 5, 2025
PubMed
概括

科学家们发现了一种利用高速碰撞加速宇宙射线质子的新方法. 这种机制是由天体物理冲击中的强烈电场驱动的,可以显著提高质子能量.

关键词:
强烈的激光脉冲激光脉冲.质子加速的质子加速.相对论电磁冲击是一种相对论电磁冲击.

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科学领域:

  • 等离子体物理学的物理学
  • 天体物理学 天体物理学
  • 高能粒子加速的高能粒子加速

背景情况:

  • 了解极端宇宙射线能量的起源是天体物理学的关键.
  • 目前的模型很难解释观测到的最高宇宙射线能量.

研究的目的:

  • 提出和研究一种用于加速宇宙射线质子的新型机制.
  • 为了确定冲击特性和可实现的质子能量的关系.

主要方法:

  • 分析天体和磁场之间的高速碰撞.
  • 哈密尔顿分析来推导质子加速的缩放定律.
  • 一维 (1D) 粒子在细胞 (PIC) 模拟电磁冲击加速.

主要成果:

  • 确定了一种产生强烈横向电场的新型机制,能够将质子捕获并加速到相对论能量.
  • 导出了一个调度定律,将质子能量与最小相对论电磁冲击厚度相关联.
  • PIC模拟显示了使用模拟冲击的质子加速从4.7 MeV到13 GeV.

结论:

  • 拟议的机制为宇宙射线质子加速在天体物理环境中提供了可行的途径.
  • 这些发现表明,在使用激光-等离子体相互作用的受控实验室环境中,有可能进行实验验证.