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相关概念视频

Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
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相关实验视频

Updated: May 11, 2026

Quasi-light Storage for Optical Data Packets
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用基因优化的代码增强光脉冲编码相位敏感OTDR系统的性能.

Hanyu Zhao, Fei Liu, Zhiwen Lian

    Optics express
    |November 14, 2024
    PubMed
    概括

    这项研究引入了一种新的基因优化代码 (Go-code),用于光脉冲编码在相位敏感光时域反射计 (φ-OTDR) 中. 新方法显著提高了信号噪声比,减少了脉冲扭曲,改善了振动传感性能.

    科学领域:

    • 光子学和光学传感器
    • 信号处理 信号处理
    • 光纤技术 光纤技术 的应用.

    背景情况:

    • 阶段敏感的光学时域反射计 (φ-OTDR) 传统上使用标准编码序列进行探测脉冲.
    • 在 φ-OTDR 系统中使用的 Erbium-doped 纤维放大器 (EDFA) 可能会因增益和导致探头脉冲扭曲.
    • 这种扭曲会对信号噪声比率 (SNR) 和总体传感性能产生负面影响.

    研究的目的:

    • 为 φ-OTDR (GOPC φ-OTDR) 提出和研究一种基于基因优化的代码 (Go-code) 的新型光脉冲编码 (OPC) 方案.
    • 为了减轻由EDFA增益和引起的探头脉冲扭曲.
    • 为了提高φ-OTDR系统的SNR和振动传感能力.

    主要方法:

    • 使用分布式遗传算法 (DGA) 开发了一种独特的Go-code序列,该算法针对φ-OTDR振动传感进行了优化.
    • 理论分析EDFA增益和效应和特定于Go-code序列的编码增益.
    • GOPC φ-OTDR与标准的Golay φ-OTDR系统的实验实施和比较.

    主要成果:

    • 与Golay φ-OTDR相比,GOPC φ-OTDR在解码响应中显示出较少的扭曲.
    • 在10公里传感范围内,在相变调 SNR 中大约有7.48dB的改进.

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  • 证明Go-code序列在适应 φ-OTDR.OTDR中的振动传感要求方面是有效的.

    • 结论:

    • 拟议的GOPC φ-OTDR方案在SNR和扭曲缓解方面提供了显著的改进.
    • 这项研究标志着Go-code在φ-OTDR中的首次应用,验证了它在先进光学传感方面的潜力.
    • 这些发现为探索和开发光纤光学传感中先进的光脉冲编码技术开辟了新的可能性.