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相关概念视频

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

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Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
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Types of Radioactivity03:23

Types of Radioactivity

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The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
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相关实验视频

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Measuring Diffusion Coefficients via Two-photon Fluorescence Recovery After Photobleaching
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在双层扩散介质中最大光子透深度的统计数据.

Fabrizio Martelli1, Antonio Pifferi2,3, Andrea Farina3

  • 1Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Sesto Fiorentino, Firenze, Italy.

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概括

这项研究量化了光子透深度在两个层的扩散介质的时间域和连续波系统. 结果为生物医学光学和先进显微镜领域的光学系统的设计提供了信息.

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科学领域:

  • 生物医学光学 生物医学光学
  • 先进的显微镜技术 显微镜技术
  • 光子学 是一个光子学.

背景情况:

  • 了解散射介质中的光传播对于光学成像至关重要.
  • 双层扩散介质带来了复杂的光传输挑战.
  • 描述光子透深度对于优化光学系统设计至关重要.

研究的目的:

  • 在双层扩散介质中呈现光子透深度的数值结果.
  • 分析概率密度函数和平均透深度.
  • 为时间域和连续波光学系统提供实际设计考虑.

主要方法:

  • 进行了数值模拟.
  • 计算了概率密度函数f (z) 和平均光子最大透深度'z'.
  • 研究了各种光学特性 (吸收,散射系数) 和几何配置 (层厚度,源探测器距离).

主要成果:

  • 对不同的场景来说,确定了概率密度函数和平均透深度.
  • 这项研究探讨了时间域和连续波模式.
  • 结果突出了光学特性和几何形状对光透的影响.

结论:

  • 这些发现为复杂的散射环境中的光传输提供了有价值的见解.
  • 时间域和连续波系统的实际设计准则得到了推导.
  • 这项研究适用于生物医学光学和先进显微镜应用.