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相关概念视频

Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Atomic Nuclei: Larmor Precession Frequency01:11

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Muscle Stimulation Frequency01:22

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Electro-mechanical Systems01:19

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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相关实验视频

Updated: Jan 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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磁强制机械频率子 磁强制机械频率子

Guanqi Ye1, Ruitong Sun1, Junning Zhao1

  • 1Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities, Institute of Physics Frontiers and Interdisciplinary Sciences, School of Physics and Technology, Nanjing Normal University, Nanjing, China.

Nature communications
|November 10, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用磁阻力创建了一个可调节的机械频率. 这种磁力机械系统产生了可调节间距的和和半和,对传感器和天线有用.

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相关实验视频

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科学领域:

  • 磁力机械系统 磁力机械系统
  • 非线性动力学是一种非线性动力学.
  • 声波频率的产生频率.

背景情况:

  • 在磁力-机械相互作用中,磁强度是至关重要的.
  • 机械频率通常需要复杂的设置.
  • 现有的磁力机械系统缺乏精确的频率控制.

研究的目的:

  • 提出和演示一种新的机械频率组合.
  • 为了利用磁力压力共振器的基本模式.
  • 为了实现可调节的间距和控制波生成.

主要方法:

  • 实验演示使用毫米尺度磁强制性宏观共振器.
  • 接近共振的送 (fp ≈ f0) 和参数刚度调制 (fs ≪ f0).
  • 使用Duffing方程分析偏差磁力和调制硬度.

主要成果:

  • 在kHz模式下观察到整数和和半整数和两种.
  • 通过调整fs. 演示了Hz分辨率和间距 (牙间距) 的连续调整.
  • 成功切换了半整数和的子,通过抑制周期翻倍分叉来改变频率.

结论:

  • 拟议的磁力机械平台提供了一个可调节的声频源.
  • 达芬方程准确地模拟了观察到的形和动态.
  • 潜在的应用包括非侵入性传感器和声波范围内的无线天线.