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相关概念视频

Phasor Arithmetics01:13

Phasor Arithmetics

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Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular...
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Phasors01:12

Phasors

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Phasors are a powerful mathematical tool used to analyze alternating current (AC) circuits. They provide a complex number representation of sinusoids, with the magnitude of the phasor equating to the amplitude of the sinusoid and the angle of the phasor representing the phase measured from the positive x-axis.
One of the significant benefits of using phasors is that they simplify the analysis of AC circuits by eliminating the time dependence of the current and voltage. This transformation...
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Phasor Relationships for Circuit Elements01:16

Phasor Relationships for Circuit Elements

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Phasor representation is a powerful tool used to transform the voltage-current relationship for resistors, inductors, and capacitors from the time domain to the frequency domain. This transformation simplifies the analysis of alternating current (AC) circuits.
In the time domain, Ohm's law provides a fundamental relation between the current flowing through a resistor and the voltage across it:
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Electric Field of Two Equal and Opposite Charges01:30

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
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X-ray Crystallography02:18

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Kirchoff's Laws using Phasors01:12

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Analyzing AC circuits in electrical systems is a fundamental aspect of electrical engineering. In these circuits, AC power is supplied from a distribution panel and wired to various household appliances in parallel. To perform a comprehensive analysis, electrical engineers use Kirchhoff's voltage and current laws, which are equally applicable in AC circuits as in DC circuits.
Kirchhoff's voltage law (KVL) states that the sum of phasor voltages around a closed loop in an AC circuit...
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Fourier-Based Diffraction Analysis of Live Caenorhabditis elegans
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在相位场中的前向和反向衍射.

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    此摘要是机器生成的。

    光器场通过将继电器墙作为虚拟摄像头来处理非视线 (NLOS) 成像. 这项研究将分相场重新解释为反射衍射方法,提供了新的类比和隐藏物体重建的良好配方.

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    科学领域:

    • 光学是什么?光学是什么?
    • 计算成像技术的成像
    • 反向问题 逆向问题

    背景情况:

    • 非视线成像 (NLOS) 使用分散光线重建隐藏于直接视线的场景.
    • 光器场为NLOS成像提供了一种方法,通过将其转化为虚拟视线 (LOS) 成像.
    • 雷利-索默菲尔德衍射 (RSD) 积分是相位场方法中的一个关键组成部分.

    研究的目的:

    • 重新解释分相场作为NLOS成像的反射衍射方法.
    • 引入新的类比,以了解继电墙在NLOS成像中的作用.
    • 为了制定和解决NLOS成像问题作为一个反射衍射问题.

    主要方法:

    • 利用前置衍射运算子及其双空间的单元性质.
    • 开发NLOS成像的两个新类比:相结合器和全息记录器.
    • 制定NLOS成像作为一个反向衍射问题 ("反向相位场") 并用数值解决它.

    主要成果:

    • 证明分相场可以理解为反射衍射技术.
    • 确定NLOS成像的反射衍射配方在哪些条件下是正确的.
    • 提出NLOS成像的新质量指标,该指标基于前向衍射运算子的矩阵等级.

    结论:

    • 子场提供了一个强大的框架来解决NLOS成像的反向问题.
    • 逆相位场的配方阐明了NLOS成像的不良位置性质,并确定了良好位置的条件.
    • 拟议的质量指标增强了NLOS成像系统分辨率的分析.