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相关概念视频

Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

12.4K
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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Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
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Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

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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...
496
Convolution Properties II01:17

Convolution Properties II

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The important convolution properties include width, area, differentiation, and integration properties.
The width property indicates that if the durations of input signals are T1 and T2, then the width of the output response equals the sum of both durations, irrespective of the shapes of the two functions. For instance, convolving two rectangular pulses with durations of 2 seconds and 1 second results in a function with a width of 3 seconds.
The area property asserts that the area under the...
635

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相关实验视频

Updated: Mar 10, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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反向设计的芯片上轨道角动量模式转换器用于光学卷积加速.

Yumeng Chen1, Kuo Zhang2, Kun Liao1

  • 1State Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter & Frontiers Science Center for Nano-optoelectronics Peking University Beijing China.

Nanophotonics (Berlin, Germany)
|March 9, 2026
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种芯片上的设备,用于轨道角动量 (OAM) 转换和复杂化,从而实现高效的光学神经网络操作. 这一突破将OAM模式集成到先进的光子计算应用中.

关键词:
逆向设计是一种逆向设计.光学卷积的光学卷积.一个光学神经网络.轨道角运动量 轨道角运动量

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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相关实验视频

Last Updated: Mar 10, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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科学领域:

  • 光子学是指光子学的使用方法.
  • 光学计算是指光学计算的应用.
  • 人工智能的人工智能

背景情况:

  • 光学神经网络利用光的并行性来进行增强的计算.
  • 轨道角动量 (OAM) 为光学神经网络提供了巨大的潜力,因为它的无限直角模式.
  • 在芯片上的OAM转换和复杂化对于集成光子设备来说至关重要但具有挑战性.

研究的目的:

  • 介绍一款用于OAM模式转换和多重复合的创新型芯片上设备.
  • 为了证明该设备在构建OAM编码的混合光学卷积神经网络方面的能力.
  • 探索OAM与芯片上的光学神经网络集成的实际途径.

主要方法:

  • 使用OAM模式转换和多重复合的反向设计原则制造设备.
  • 对各种OAM状态的OAM转换效率和调制深度的表征.
  • 使用制造的设备实现OAM编码的混合光学卷积神经网络.

主要成果:

  • 实现了高OAM上转换效率 (88.68%) 和下转换效率 (88.04%).
  • 证明了高的复合器转换效率 (98.29%) 和调制深度 (20.69 dB).
  • 在使用OAM编码的CNN时,在MNIST上达到98.0%的准确率,在时尚MNIST上达到86.1%的准确率.

结论:

  • 开发的设备提供了一种有效的解决方案,用于芯片上的OAM转换和复杂化.
  • 该设备可以实现芯片上的光学卷积操作,推进集成光学神经网络.
  • 这项工作为在光子计算中的实际OAM集成提供了重要的一步.