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相关概念视频

Flame Photometry: Overview01:02

Flame Photometry: Overview

625
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
625
Flame Photometry: Lab01:16

Flame Photometry: Lab

255
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
255
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

393
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
393
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

398
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
398
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

150
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
150

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相关实验视频

Updated: Jul 12, 2025

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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一种使用可变形物体检测和时间序列分析实时火焰检测方法.

Jingyuan Zhang1,2, Bo Shi2, Bin Chen1

  • 1School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.

Sensors (Basel, Switzerland)
|October 28, 2023
PubMed
概括
此摘要是机器生成的。

本研究引入了使用可变形物体检测和时间序列分析的改进实时火焰检测系统. 该方法提高了准确性,减少了视频监控中的错误报警,实现了高性能指标.

关键词:
电力投资单位的损失焦点损失 焦点损失这是YOLOv5的.可以变形的卷积卷积.火焰检测检测器的火焰检测器时间序列分析分析时间序列分析

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科学领域:

  • 计算机视觉 计算机视觉
  • 人工智能的人工智能
  • 消防安全工程 消防安全工程

背景情况:

  • 在视频监控中,有效的火焰检测对于预防火灾事故至关重要.
  • 现有的方法面临着诸如不规则的火焰形状,不平衡的数据集和类似物体的干扰等挑战.

研究的目的:

  • 开发一种实时火焰检测方法,解决视频监控当前方法的局限性.
  • 提高在不同条件下检测火焰的准确性和减少虚假阳性.

主要方法:

  • 增强了具有可变形卷积的YOLOv5s网络,以改善不规则火焰形状的特征提取.
  • 优化损失函数:用于分类的焦点损失 (解决样本不平衡) 和用于回归的EIOU损失 (改善收和准确性).
  • 时间序列分析整合了当前和历史数据,以减轻因形状变化,封闭或干扰而引起的错误警报.

主要成果:

  • 实现了93.0%的平均精度 (AP) 和89.6%的F-Measure指数.
  • 与现有的火焰检测方法相比,其表现卓越.
  • 保持每秒24-26 (FPS) 的检测速度,满足实时要求.

结论:

  • 提出的可变形物体检测和时间序列分析方法显著提高了实时火焰检测的准确性和稳定性.
  • 综合方法有效地克服了在视频监控中出现不同的火焰和环境干扰所带来的挑战.
  • 这种先进的火焰检测系统为改善消防安全监控提供了实用解决方案.