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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

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.
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:

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相关实验视频

Updated: Jun 18, 2026

Vision Training Methods for Sports Concussion Mitigation and Management
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识别匹配序列值,以减轻拥挤固定装置期间的物理衰退.

Hugo Silva1,2, Pedro Menezes3, Ibai Errekagorri4

  • 1Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, University of Maia, Maia, Portugal.

International journal of sports medicine
|June 7, 2025
PubMed
概括

短暂的恢复间隔和较长的旅行距离在拥挤的比赛时间表中显著损害了球员的运动性能. 限制比赛序列可能会提高表现并降低受伤风险.

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科学领域:

  • 运动科学 运动科学 运动科学
  • 运动生理学 运动生理学
  • 生物力学 生物力学

背景情况:

  • 拥挤的比赛时间表和旅行在职业体育中很常见.
  • 了解它们对运动员身体表现的影响对于运动员管理至关重要.
  • 以前的研究还没有完全阐明恢复时间,旅行和匹配测序的综合影响.

研究的目的:

  • 调查不同恢复间隔和累积旅行距离在拥挤的比赛期间对球员运动运动活动的影响.
  • 分析匹配序列对物理性能指标的影响.
  • 确定对恢复和旅行的门,这些门会对业绩产生负面影响.

主要方法:

  • 在比赛期间使用全球导航卫星系统 (GNSS) 收集的机车数据.
  • 分析总距离,高强度跑步距离,最大速度,加速和减速.
  • 对不同恢复间隔 (<72,72-120,121-168,>168小时) 和累计行程距离 (0,1-250,251-1,000,>1,000公里) 的性能指标进行比较.

主要成果:

  • 拥挤的固定装置 (恢复时间<72和72-120小时) 导致总距离和行驶距离减少,时速为14-20公里.
  • 在拥堵期间观察到的加速和减速较少 (2-3 m/s2).
  • 高积累的旅行距离在拥挤的固定装置中加剧了性能下降.
  • 在<72小时内进行三次匹配或<120小时内进行四次匹配后,发动机活动显著下降.

结论:

  • 短暂的恢复间隔 (<120小时) 和长时间的旅行会对球员的运动性能产生负面影响.
  • 管理固定装置安排和旅行负载对于优化性能和减轻受伤风险至关重要.
  • 应考虑在拥挤期间在短时间内限制比赛数量.