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相关概念视频

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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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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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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Receiver Operating Characteristic Plot01:15

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A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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无人机阵列辅助可见光通信与增强的角度多样性发射器

Weiren Wang1, Zhihong Zeng1, Chen Chen1

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概括

无人机 (UAV) 辅助可见光通信 (VLC) 系统可以使用增强的角度多样性发射器 (ADT) 显著提高能源效率 (EE). 这项研究表明,使用多层ADT和无人机阵列,EE获得了相当大的收益.

关键词:
增强的角度多样性发射器 (ADT)无人驾驶飞行器 (UAV) 是一种无人驾驶飞行器.可见光通信 (VLC) 是一种可见光通信.

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科学领域:

  • 无线通信是一种无线通信.
  • 光学通信是一种光学通信.
  • 机器人技术 机器人技术 机器人技术

背景情况:

  • 使用无人机的可见光通信 (VLC) 提供了网络灵活性,但在无人机耐用性和服务能力方面面临限制.
  • 能源效率 (EE) 是无人机辅助VLC系统的一个关键挑战.

研究的目的:

  • 提高无人机辅助VLC系统的能源效率 (EE).
  • 为了解决无人机耐用性和服务能力的局限性.
  • 为无人机辅助的VLC提出和评估一个增强的角度多样性发射器 (ADT).

主要方法:

  • 使用多层LED,每层多个LED和层间旋转角度设计增强的ADT.
  • 共同优化ADT侧面LED的倾斜角度和无人机的悬空高度.
  • 模拟和分析集中式单个无人机和分布式无人机阵列VLC系统的EE性能.

主要成果:

  • 增强的ADT显著提高了单个无人机VLC系统的EE,与单个LED发射器相比,提高了215.7%.
  • 拟议的ADT结构包括多层LED,层间旋转和双层设计.
  • 分布式无人机阵列进一步提高了EE,四个无人机系统的EE达到19.9位/J/Hz的峰值,比单个无人机配置有298%的改进.

结论:

  • 增强的ADT在改善无人机辅助VLC系统的EE方面是有效的.
  • 与集中式单个无人机系统相比,分布式无人机阵列提供了优越的EE性能.
  • 拟议的系统设计有效地减少了电力消耗,同时满足了照明和通信要求.