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相关概念视频

Temperature Measurement Sites01:14

Temperature Measurement Sites

1.6K
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
5.3K
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

143
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...
143
Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

6.6K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
6.6K
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

1.7K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
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Wind Tunnel Experiments to Study Chaparral Crown Fires
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一个全国范围的采样温和燃料湿度数据库.

Katy Ivison1, Kerryn Little2, Alice Orpin2

  • 1School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK. k.e.ivison@bham.ac.uk.

Scientific data
|September 6, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了英国首个关于燃料含水量 (FMC) 的国家数据集,这对于了解野火可燃性和行为至关重要. 这些发现有助于为传统上不容易发生野火的地区开发火灾危险模型.

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科学领域:

  • 环境科学 环境科学
  • 林业林业 林业 林业 林业
  • 生态生态学 生态生态学

背景情况:

  • 燃料含水量 (FMC) 是影响野火可燃性,行为和严重性的关键因素.
  • 了解FMC的驱动因素和变化对于准确的野火风险评估和管理至关重要.
  • 传统上不易发生火灾的地区,如英国,正在经历新兴的易发生火灾的生态系统,突出需要本地化燃料湿度数据.

研究的目的:

  • 建立第一个英国 (英国) 全国范围的温室燃料含水量 (FMC) 数据集.
  • 描述FMC在英国多种生态系统中的时空驱动因素.
  • 为在非火灾易发地区开发火灾危险评级系统提供基础数据.

主要方法:

  • 在2021-2023年期间,从英国58个地点收集了来自18个燃料成分的8,057个燃料样本.
  • 进行了三个不同的抽样研究:英国范围的长期,景观规模 (北约克郡沼泽地) 和地块规模 (西米德兰兹).
  • 研究的时空驱动因素,景观驱动的变化,日间模式和FMC的测量变化.

主要成果:

  • 创建了英国温带燃料类型的综合性国家FMC数据集.
  • 确定了影响燃料湿度动态的关键时空驱动因素.
  • 在景观和地块尺度,包括白天模式的FMC量化变化.

结论:

  • 开发的英国FMC数据集解决了传统上不易发生火灾的地区的重大数据缺口.
  • 这项研究有助于我们更好地理解温带气温燃料湿度动态.
  • 这些发现为建立英国火灾危险评级系统做出了根本性的贡献.