Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

2.8K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
2.8K
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

120
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
120
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

3.4K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.4K
Speed of a Transverse Wave01:13

Speed of a Transverse Wave

1.6K
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
1.6K
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

107
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
107

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Perioperative ctDNA as a prognostic biomarker in endometrial cancer - the CODEC study.

Translational oncology·2026
Same author

Clinical and Radiologic Characteristics of Familial Pulmonary Fibrosis.

Annals of the American Thoracic Society·2026
Same author

Associations of spirituality and craving among individuals in substance use disorder treatment: A latent change score modeling approach.

Drug and alcohol dependence·2026
Same author

Association of CT Features with Radiologic Patterns in Interstitial Lung Disease: Multinomial Analysis in CARE-PF.

Radiology·2026
Same author

Airborne dust exposure during the application of talc-based pressed powder makeups.

Journal of occupational and environmental hygiene·2026
Same author

Letter to the Editor: 'Asbestosis Requiring Lung Transplantation in a Retired Hairdresser: An Occupational Exposure to Comb Through'.

Respirology case reports·2025
Same journal

Daily briefing: 'Cyborg' cockroaches breathe underwater with printed suit.

Nature·2026
Same journal

China boosts prestigious grants for young scientists - will it ease competition?

Nature·2026
Same journal

Incoming US science academy chief vows to 'double down' on research.

Nature·2026
Same journal

Author Correction: Synthesis of enantioenriched atropisomers by biocatalytic deracemization.

Nature·2026
Same journal

Electrodeposited self-assembled molecules for perovskite photovoltaics.

Nature·2026
Same journal

Neutrino's nursery found: the 'Shadow Blaster'.

Nature·2026
查看所有相关文章

相关实验视频

Updated: Jul 26, 2025

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

10.9K

未来地球同步链路的量子有限光学时间传输

Emily D Caldwell1,2, Jean-Daniel Deschenes3, Jennifer Ellis1

  • 1National Institute of Standards and Technology (NIST), Boulder, CO, USA.

Nature
|June 21, 2023
PubMed
概括
此摘要是机器生成的。

研究人员实现了近量有限的光学时间传输, 这一突破为精确的时间传播和先进的科学应用提供了强大的自由空间网络.

更多相关视频

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.0K
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

14.6K

相关实验视频

Last Updated: Jul 26, 2025

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

10.9K
Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.0K
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

14.6K

科学领域:

  • 物理
  • 测量学
  • 天文学

背景情况:

  • 光学时钟和光学时间传输是先进网络的关键.
  • 目前的光学时间传输缺乏量子有限的性能.
  • 连接地面和太空光学时钟可以实现新的应用.

研究的目的:

  • 为了证明光学时间转移在近量子有限的性能.
  • 为了实现强大的自由空间光学时间传输网络.
  • 为了减少时间同步所需的接收功率.

主要方法:

  • 证明时间转移与近量子有限的获取和定时.
  • 使用较低的接收功率 (比以前低1万倍).
  • 在山顶之间实现了超过300公里的同步.

主要成果:

  • 远距离站点同步到320个阿托秒.
  • 运行在1万倍低的接收功率.
  • 在光学时间传输中实现了接近量子限制的性能.

结论:

  • 这种方法对于具有有限光子的长距离自由空间连接至关重要.
  • 在4.0mW的传输功率下支持102dB的链路损失.
  • 让未来的时间转移到地球同步轨道.