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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...
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Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
177
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...
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Transmission Line Design Considerations01:23

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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以FSS为灵感的发射阵列用于动态光束成形和增强控制.

Jianfeng Yang, Juan Chen, Fan Zhu

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    此摘要是机器生成的。

    本研究引入了一种使用频率选择面 (FSS) 的新型传输阵列 (TA),用于微波系统中的动态光束成形和增益控制. 这项技术可实现实时电磁操纵,用于先进的无线应用.

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    科学领域:

    • 电磁学和微波工程 电磁学和微波工程
    • 甲基材料和甲基表面.
    • 天线理论和设计.

    背景情况:

    • 传统的传输阵列 (TAs) 提供固定的光束成形能力.
    • 在现代无线通信中,对可重新配置天线的需求正在增加.
    • 频率选择性表面 (FSS) 提供了依赖频率的电磁响应.

    研究的目的:

    • 提出一种新的传输阵列 (TA) 概念,将相位编码调制与FSS集成在一起.
    • 为了实现动态光束成型,并在微波模式中获得控制.
    • 探索TA在无线通信和能源采集中的新应用.

    主要方法:

    • 设计了一种五层堆叠带通FSS单元,配有用于相位调节的varactor二极管.
    • 使用料网络来控制单个TA元件的传输阶段.
    • 通过改变变电器偏差电压来实现相位编码序列,以便实时进行EM操纵.

    主要成果:

    • 通过不同的阶段编码安排,证明了动态光束成形和增强控制.
    • 通过数值模拟和实验验证验证了拟议的策略.
    • 实现了TA辐射远场的实时定制.

    结论:

    • 拟议的以FSS为灵感的TA具有相位编码调制,可实现动态光束成形和增强控制.
    • 这种方法显著提高了发射阵列的功能和应用前景.
    • 潜在的应用包括可重新配置的光束发射器,远程无线链路和射频能量采集.