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相关概念视频

Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

194
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...
194
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

241
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
241
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

122
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...
122
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
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Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
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相关实验视频

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基于模式多样性的二维相位阵列天线光束成形系统.

Shiming Wang, Xiuquan Li, Yiliang Jia

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    此摘要是机器生成的。

    本研究介绍了一种使用模式多样性的新型二维相位阵列天线光束成形系统. 这种创新方法通过在单一光纤核心中通过不同的模式传输信号来减少系统的大小和复杂性.

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    科学领域:

    • 光子学和光学工程的工程.
    • 天线系统和信号处理系统.
    • 光纤通讯是指光纤通讯的一种方式.

    背景情况:

    • 传统的阶段式阵列天线系统面临着尺寸,复杂性和信号控制方面的挑战.
    • 模式多样性为增强天线系统性能和小型化提供了潜在的解决方案.

    研究的目的:

    • 为了展示一个二维相位阵列天线光束形成系统,首次利用模式多样性.
    • 为了实现真正的时间延迟控制和使用光学信号操纵的二维光束扫描.
    • 通过实验验证和与模拟进行比较来验证系统的性能.

    主要方法:

    • 使用少数模式的长期光纤网格来激发不同的光学模式.
    • 采用少数模式光纤布拉格格和2×2光学开关用于光学信号路径控制.
    • 实施光学开关和基于循环器的循环结构,用于实验验证.
    • 测试不同频率和光束指向角度的2×3阶段阵列天线系统的远场辐射模式.

    主要成果:

    • 基于模式多样性的二维相位阵列天线光束成形系统的成功演示.
    • 实验验证证了该系统能够在没有眼的情况下实现二维光束扫描的能力.
    • 远场辐射模式与模拟结果相匹配,验证了系统的准确性.
    • 模式多样性方法有效地降低了光学控制阶段阵列雷达系统的总体体积和复杂性.

    结论:

    • 展示的模式多样性束形系统为光学控制的相位阵列雷达显著减少了尺寸和复杂性.
    • 使用模式作为单一光纤核心中的独立通道简化了信号传输和处理.
    • 这项技术为未来的高性能,紧型天线系统提供了有希望的进步.