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相关概念视频

Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

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A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
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Conservation of Angular Momentum01:09

Conservation of Angular Momentum

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A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
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Angular Momentum01:21

Angular Momentum

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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
194
Multimachine Stability01:25

Multimachine Stability

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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
141
Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

193
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
193
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

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Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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通过错误分析提高多平面光转换轨道角动量多重机性能.

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    此摘要是机器生成的。

    这项研究引入了一种使用多平面光转换 (MPLC) 的新型轨道角动量 (OAM) 复合装置. 该设备在光通信实验中表现出强大的性能,显示低交叉声和插入损失.

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 光学通信是指光学通信.
    • 超材料和纳米光子学

    背景情况:

    • 轨道角动量 (OAM) 复杂化对于增加光通信能力至关重要.
    • 多平面光转换 (MPLC) 提供了一种生成和操纵OAM状态的方法.
    • 在MPLC设备中的制造缺陷可能会影响其性能.

    研究的目的:

    • 介绍一款基于MPLC的新型OAM复杂化装置.
    • 调查制造错误 (错位,蚀刻不准确) 对MPLC设备性能的影响.
    • 展示MPLC OAM设备在光通信系统中的实际应用.

    主要方法:

    • 使用四相平面MPLC装置用于OAM生成 (拓电荷l=0到±3).
    • 采用空间光调节器来分析错位和蚀刻错误的影响.
    • 制造的MPLC设备在玻璃基板上具有不同的蚀刻深度 (0-775nm).
    • 进行了光通信实验,将10 Gbit/s的OOK信号传输到5公里的少数模式光纤上.

    主要成果:

    • 实现了OAM复杂化/解复杂化交叉声分别低于-20dB和-18dB.
    • 报告的插入损失低于7dB,用于与少数模式光纤合的生成OAM模式.
    • 通过使用两个MPLC设备,成功演示了3个OAM通道的多重传输,这些通道携带10 Gbit/s的OOK信号,运行在5公里的少数模式光纤上.

    结论:

    • 开发的基于MPLC的OAM复杂化设备表现出卓越的性能特性.
    • 该研究为改善MPLC设备制造减轻制造错误提供了宝贵的见解.
    • MPLC OAM 设备显示出增强未来光通信网络的巨大潜力.