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相关概念视频

Flame Photometry: Overview01:02

Flame Photometry: Overview

474
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...
474
Flame Photometry: Lab01:16

Flame Photometry: Lab

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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...
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相关实验视频

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Wind Tunnel Experiments to Study Chaparral Crown Fires
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在森林树冠上使用波纹研究火 - 大气相互作用.

Ajinkya Desai1, Clément Guilloteau1, Warren E Heilman2

  • 1Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697 USA.

Boundary-layer meteorology
|December 13, 2024
PubMed
概括
此摘要是机器生成的。

野火会产生复杂的动荡. 这项研究使用波形分析来发现火灾引起的温度和流量模式的特征时间尺度,揭示了比正常更短的坡道持续时间和更高的斜率.

关键词:
交叉波段连贯性 交叉波段连贯性标题表面火灾的火灾表面热量/动量流动的流动.坡道悬崖结构 悬崖结构时间频平面时间频平面

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科学领域:

  • 大气科学 大气科学
  • 野地的火灾动力学 野地的火灾动力学
  • 流研究 流研究

背景情况:

  • 野火与大气的相互作用会产生复杂的,多层次的流.
  • 这种流影响着火灾的传播,火柴的传输和烟雾的散发.
  • 了解这些动态对于准确的火灾行为建模至关重要.

研究的目的:

  • 调查风力驱动森林火灾期间温度和流的连贯模式的特征时间尺度.
  • 用波束技术分析火如何影响流结构及其演变.
  • 为改善野火和标量运输模型提供见解.

主要方法:

  • 利用基于波纹的技术来分析塔式声波动力计的温度和速度测量.
  • 在时间频率平面上检查能量密度,以确定流的时间尺度.
  • 采用交叉波形连贯性分析来研究在树冠顶部附近的热量和动量流量事件.

主要成果:

  • 确定了温度调节火灾的坡道-悬崖结构,其持续时间较短,斜坡比环境条件更.
  • 观察到由火引起的热流事件连贯到1秒的时间段,与17秒以上的环境事件不同.
  • 随着火灾前线的演变,在树冠顶部附近的流特征的记录变化,表明火焰影响和大气变化的变化.

结论:

  • 波形分析揭示了火灾引起的流特征的独特时间尺度.
  • 了解这些尺度是开发更可靠的野火行为和运输模型的关键.
  • 该研究为多个尺度的火-大气相互作用动态提供了定量基础.