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相关概念视频

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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相关实验视频

Updated: Jan 9, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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基于可见光通信的多服务复杂化系统.

Yangyu Zhang1,2

  • 1State Key Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
概括
此摘要是机器生成的。

这项研究开发了一种可见光通信 (VLC) 系统,用于混合音频和数据传输,解决无线频谱稀缺问题. 这种具有成本效益的系统在高频敏感环境中提供了强大的多服务通信.

关键词:
音频通讯 音频通讯 音频通讯信号处理 信号处理 信号处理时间划分多重复合.可见光通信可见光通信

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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相关实验视频

Last Updated: Jan 9, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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科学领域:

  • 无线通信技术无线通信技术
  • 光学通信系统 光学通信系统
  • 信号处理 信号处理

背景情况:

  • 物联网 (IoT) 推动了对高效无线通信的需求.
  • 可见光通信 (VLC) 为无线频谱短缺提供了解决方案.
  • 多服务复用增强了VLC系统的实用性.

研究的目的:

  • 使用VLC设计和实施一个多服务多重复制系统.
  • 通过单一通道实现音频和字符数据的混合传输.
  • 评估系统的性能和适用性.

主要方法:

  • 使用动态级别控制重建立体声传输协议.
  • 使用双缓冲器实现定时中断服务例程.
  • 在处理函数中重新分配通道状态位.

主要成果:

  • 在单个VLC频道上成功传输音频 (1-21.6 kHz) 和字符数据 (300-1200 bps) 的混合传输.
  • 在3.2米的通信范围内精确地复制语音和文本信号.
  • 在线视线 (LoS) 场景中证明对多路径干扰的稳定性.

结论:

  • 开发的VLC系统有效地支持多服务复杂化.
  • 该系统具有成本效益,易于集成到现有照明中,适用于对射频敏感的区域.
  • VLC为多服务通信提供了一个有希望的替代方案,补充了现有的无线技术.