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相关概念视频

Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

377
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
377
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

390
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
390
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

834
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
834
Interference: Path Lengths01:10

Interference: Path Lengths

1.8K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.8K
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

411
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
411
Power Factor Correction01:20

Power Factor Correction

473
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
473

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相关实验视频

Updated: Jan 11, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

10.3K

通过跨相调制实现的部分连贯的持久空心梁.

Jun Zeng, Ruyi Li, Zhao Zhang

    Optics express
    |November 11, 2025
    PubMed
    概括

    我们引入了部分连贯持续空心 (PCPH) 束,一种新型的光束. 这些光束在传播过程中保持其空心形状,并且在具有挑战性的环境中具有坚固性.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 激光物理 激光物理
    • 波浪传播 波浪传播

    背景情况:

    • 部分连贯性可以提高光传播稳定性,但往往会降低结构化的强度配置文件.
    • 在部分连贯的光束中保持中心强度的零值是具有挑战性的.

    研究的目的:

    • 提出和验证一个新类型的部分连贯的随机束,具有持久的空心形状.
    • 为了研究这些光束的特性和强度,称为PCPH光束.

    主要方法:

    • 使用跨相调制生成PCPH光束.
    • 对光束传播和连贯效应的理论分析.
    • 在热流下进行实验验证.

    主要成果:

    • 在远场传播过程中,PCPH光束表现出持续的空心配置.
    • 证明了可调整的聚焦特性和对抗环境干扰的增强强性.
    • 在流下保持空洞结构方面,PCPH光束的性能优于常规状光束.

    结论:

    • PCPH光束为结构光的稳定传播提供了一个新的解决方案.
    • 它们的特性使得它们适用于光学操纵和自由空间光学通信中的应用.

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    相关实验视频

    Last Updated: Jan 11, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

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    Published on: January 28, 2019

    10.3K
    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs

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  • 在不利的条件下,PCPH光束显示出强大的光束形状的强大潜力.