emissivity

简明释义

英[ɪmɪˈsɪvɪti]美[ˌeməˈsɪvəti]

n. [物] 发射率；辐射系数

英英释义

单词用法

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例句

1.The metal emissivity in natural environment is influenced by its temperature and the average emissivity of the surroundings.

在自然环境中金属的发射率受其自身温度和周围环境平均发射率的影响。

2.At present, the energy-saving glasses applied in architecture mainly include low emissivity (low-e) glass and solar control glass.

目前广泛应用在建筑上的节能型镀膜玻璃主要有低辐射镀膜玻璃和阳光控制功能镀膜玻璃。

3.Based on the local thermal equilibrium and component effective emissivity concept the radiant model of continuous vegetation has been studied.

论文基于局地热平衡条件和组分有效发射率概念探讨了连续植被的热辐射方向性模型。

4.Based on the Wien's law temperature and emissivity of flame were obtained by processing the measured data with an optimization algorithm.

根据这一特点，从维恩公式出发，利用最优化方法处理测得的火焰辐射光谱信号，得到了火焰的温度和黑度。

5.Sometime, the effect of emissivity is quite conspicuous under some specific conditions of environment.

在某些特定条件下，这一因素的影响是十分显著的。

6.Coatings specially designed for reduced optical reflectivity or emissivity.

专门设计用来降低光学反射或辐射的涂料。

7.One way is to measure a cell that behaves similarly with a point and shoot emissivity temperature reader.

其中的一个方法是测量行为类似于针对某个点的单元，并记录辐射率温度读取器。

8.Extensive numerical calculations of the emissivity have been performed over a broad range of parameters.

在很宽的参数变化范围内对辐射率作了数值计算。

9.The emissivity of a material determines how effectively it emits thermal radiation.

材料的发射率决定了它多有效地发出热辐射。

10.High emissivity surfaces are important in thermal management applications.

在热管理应用中，高发射率表面是很重要的。

11.The emissivity of polished metals is generally low compared to rough surfaces.

抛光金属的发射率通常低于粗糙表面。

12.To improve energy efficiency, buildings often use materials with high emissivity for roofs.

为了提高能效，建筑物通常在屋顶上使用高发射率的材料。

13.Measuring the emissivity of a surface can help in understanding its thermal properties.

测量表面的发射率可以帮助理解其热特性。

作文

In the field of thermal physics, understanding the concept of emissivity is crucial for various applications, including engineering, astronomy, and environmental science. Emissivity refers to the efficiency with which a surface emits thermal radiation compared to that of a perfect black body at the same temperature. A perfect black body has an emissivity of 1, meaning it emits all the thermal radiation possible, while other materials have lower values, indicating they emit less thermal energy. This property is significant because it affects how heat is transferred in different environments. For instance, in engineering, the emissivity of materials plays a vital role in designing heating and cooling systems. Engineers must consider the emissivity of surfaces when calculating heat loss or gain in buildings. A material with high emissivity, such as black paint, will radiate heat more effectively than a shiny metal surface, which has a low emissivity. This knowledge helps engineers select appropriate materials to achieve energy efficiency in construction. In astronomy, understanding emissivity is essential for studying celestial bodies. The temperature of stars and planets can be inferred from the thermal radiation they emit. For example, astronomers must account for the emissivity of a planet's surface when analyzing its thermal infrared emissions. If the emissivity is not accurately known, it could lead to incorrect assumptions about the planet's temperature and composition, affecting our understanding of its atmosphere and potential for supporting life. Environmental scientists also utilize the concept of emissivity when studying climate change and the Earth's energy balance. The emissivity of the Earth’s surface influences how much heat is retained or lost to space. Changes in land use, such as deforestation or urbanization, can alter the emissivity of the surface, impacting local and global temperatures. By measuring the emissivity of different surfaces, scientists can better understand the effects of human activity on climate patterns. Moreover, the concept of emissivity is crucial in thermal imaging technology. Infrared cameras rely on the emissivity of objects to detect temperature differences. When using thermal cameras, operators need to input the correct emissivity value for accurate temperature readings. Failure to do so can result in misleading data, which could have serious implications in fields such as firefighting, building inspections, and medical diagnostics. In conclusion, emissivity is a fundamental concept that spans multiple disciplines, from engineering to environmental science. Its importance cannot be overstated, as it influences heat transfer, energy efficiency, and our understanding of the universe. As we continue to face challenges related to energy consumption and climate change, a deeper understanding of emissivity will be essential for developing innovative solutions that promote sustainability and efficiency in our daily lives.

在热物理学领域，理解发射率的概念对于各种应用至关重要，包括工程、天文学和环境科学。发射率是指表面与相同温度下完美黑体相比，发出热辐射的效率。完美黑体的发射率为1，意味着它发出所有可能的热辐射，而其他材料的值较低，表示它们发出的热能较少。这个特性非常重要，因为它影响不同环境中的热量传递。 例如，在工程学中，材料的发射率在设计供热和制冷系统时起着至关重要的作用。工程师在计算建筑的热损失或增益时必须考虑表面的发射率。具有高发射率（例如黑色涂料）的材料将比光亮金属表面（其发射率较低）更有效地辐射热量。这一知识帮助工程师选择合适的材料，以实现建筑的能源效率。 在天文学中，理解发射率对于研究天体至关重要。恒星和行星的温度可以通过它们发出的热辐射来推断。例如，天文学家在分析行星的热红外辐射时必须考虑其表面的发射率。如果发射率没有准确知道，可能会导致对行星温度和组成的错误假设，从而影响我们对其大气和支持生命潜力的理解。 环境科学家在研究气候变化和地球能量平衡时也利用发射率的概念。地球表面的发射率影响热量保留或向太空散失的多少。土地利用的变化，例如森林砍伐或城市化，可以改变表面的发射率，影响地方和全球温度。通过测量不同表面的发射率，科学家可以更好地理解人类活动对气候模式的影响。 此外，发射率的概念在热成像技术中至关重要。红外相机依赖物体的发射率来检测温度差异。在使用热成像相机时，操作员需要输入正确的发射率值以获得准确的温度读数。如果不这样做，可能会导致误导性数据，这在消防、建筑检查和医学诊断等领域可能产生严重影响。 总之，发射率是一个基本概念，跨越多个学科，从工程到环境科学。其重要性不容小觑，因为它影响热传递、能源效率以及我们对宇宙的理解。随着我们继续面临与能源消耗和气候变化相关的挑战，更深入地理解发射率将对开发促进可持续性和效率的创新解决方案至关重要。