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相关概念视频

Flail Chest-II01:26

Flail Chest-II

Managing flail chest, a condition characterized by a segment of the chest wall moving independently from the rest of the thoracic cage, requires a comprehensive approach. It includes a thorough assessment of the patient's condition, a diagnostic evaluation to determine the extent of the injury, and the implementation of appropriate medical interventions tailored to the individual's needs.
Assessment:
1. Clinical Evaluation:
History:
Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...

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相关实验视频

Updated: May 12, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

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FMCW激光测距系统基于与直接注入电流调节的相同频率重新采样.

Zhiyuan Gong, Xuanke Tong, Chuanxin Teng

    Optics express
    |June 14, 2025
    PubMed
    概括

    这项研究引入了一种新的激光测距系统,使用调制信号重新采样来克服频率调制连续波 (FMCW) 激光中的非线性. 该方法通过消除错误的数据点来提高距离分辨率和准确性.

    科学领域:

    • 光电学是指光电子产品.
    • 光学传感传感器是什么?
    • 计量学 计量学 计量学

    背景情况:

    • 频率调制连续波 (FMCW) 激光雷达系统通常在激光频率调制中存在非线性问题.
    • 这些非线性,包括放松振荡效应和模式跳跃,在距离测量中引入错误.
    • 现有的纠正这些错误的方法可能很复杂,或者导致数据点丢失.

    研究的目的:

    • 开发一个激光测距系统,有效地解决FMCW固有的非线性.
    • 为了提高FMCW激光雷达系统中距离测量的精度和分辨率.
    • 提出一种可靠的方法来消除由激光缺陷引起的错误采样点.

    主要方法:

    • 作为频率调节的光源,使用了1550nm分布式反 (DFB) 激光器,采用直接注入电流调节.
    • 采用了相同频率的重新采样方法,涉及数据采集,分析和处理,以识别和删除错误的采样点.
    • 开发了一个划分采样区域的算法,以保持最大的正确采样点,改进了手动划分.

    主要成果:

    • 提出的方法成功地消除了由激光频率噪声,模式跳转和扫描反转点引起的非线性错误.
    • 该系统在10米自由空间光学范围内实现了约6.8mm的距离分辨率.
    • 在1米自由空间光学范围测量时,记录了0.19mm的标准偏差 (STD).

    更多相关视频

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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    相关实验视频

    Last Updated: May 12, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    12.1K
    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
    10:52

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

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    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
    10:42

    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

    Published on: March 22, 2019

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    结论:

    • 调制信号重新采样技术有效地弥补了FMCW激光雷达系统中的非线性.
    • 与先前的技术相比,开发的算法显著提高了距离分辨率和可重复性准确性.
    • 这种方法为光学测距应用提供了更强大,更精确的解决方案.