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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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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相关实验视频

Updated: May 2, 2026

Fabrication and Characterization of Superconducting Resonators
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Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

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基于低温蓝宝石振荡器的高性能频率参考.

Encai Zhong1, Yan Zheng1, Jinxu Hong1

  • 1National Gravitation Laboratory, MOE Key Laboratory of Fundamental Quantities Measurement & Hubei Key Laboratory of Gravitational and Quantum Physics, and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

The Review of scientific instruments
|June 18, 2025
PubMed
概括
此摘要是机器生成的。

带有新型过器的低温蓝宝石振荡器产生超低相位噪声微波信号. 这些高性能频率参考实现了精确测量实验的优良稳定性.

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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Fabrication and Characterization of Superconducting Resonators
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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科学领域:

  • 物理 物理学 物理
  • 计量学 计量学是一门学科.

背景情况:

  • 精确测量实验要求频率引用具有最小的相位噪声和高稳定性.
  • 低温蓝宝石振荡器 (CSO) 是微波频率参考的有希望的候选者,当与相位噪声取消和频率合成相结合时.

研究的目的:

  • 开发一种低温蓝宝石振荡器 (CSO) 系统,用于产生超低相位噪声微波信号.
  • 为了实现高级科学应用的优良频率稳定性.

主要方法:

  • 一个冷的蓝宝石过器与CSO集成,以抑制相位噪声.
  • 一个频率转换链被设计用于产生多个参考频率 (9GHz,100MHz,10MHz).

主要成果:

  • 在1MHz偏移频率下产生10.798GHz微波信号,超低相位噪声为-165dBc/Hz.
  • 在低10^-15范围内实现了分数频率稳定性,整合时间为1001000秒.

结论:

  • 开发的CSO系统提供了高性能微波频率参考.
  • 这种技术适用于要求高的科学应用,需要特殊的频率稳定性和低相位噪声.