emittance

简明释义

英[ɪˈmɪtəns]美[ɪˈmɪtəns]

n. 发射率；发射量

英英释义

单词用法

同义词

反义词

例句

1.Spectrally selective coatings for solar-thermal applications are optimised for a high solar absorptance and a low thermal emittance.

涂膜的光谱选择性光热产品应用是用于高太阳能吸收率的优化和低热通量密度。

2.This article deals with the compatibility of both radiant emittance and microwave of infrared materials.

本文探讨了红外隐身材料的比辐射率及其微波兼容性。

3.Selecting the advanced Eddington coordinates, and adopting the statistical method, the instantaneous radiant emittance of non-static black hole is calculated out.

选取超前爱丁顿坐标，采用统计的方法，计算出动态黑洞的瞬时辐出度。

4.The results show that the MTGM method is an effective way of emittance measurement for intense pulse electron beam.

实验结果表明，修正三梯度方法是强流脉冲电子束发射度测量的一种有效的手段。

5.The influence of the scattering albedo and scattering phase function to the apparent emittance was investigated.

重点分析了散射反照率和散射相函数对介质层表观方向发射率和表现半球发射率的影响。

6.The shape of the emittance contour of a charged particle beam can be described by the contour function.

带电粒子束发射相图的形状可用相图函数描述。

7.A new dynamic technique for the measurement of Hemispherical Total Emittance is described in the present paper.

本章介绍了一种用于半球全波发射率测量的动态技术。

8.An automatic device for the effective and rapid measurement of electron beam emittance has been designed and installed in our laboratory.

一台有效、快速、电子束相图自动测量装置已在我们实验室设计、加工、安装完毕。

9.A method is presented for determining the emittance of hot solids.

本文讨论一种确定固体材料比辐射率的方法。

10.The emittance of the material determines how much light it can absorb and emit.

材料的发射率决定了它能吸收和发出多少光。

11.In thermal imaging, the emittance of surfaces is crucial for accurate temperature readings.

在热成像中，表面的发射率对准确的温度读取至关重要。

12.A higher emittance means that the surface can radiate energy more effectively.

更高的发射率意味着表面可以更有效地辐射能量。

13.Materials with low emittance are often used in reflective coatings.

低发射率的材料通常用于反射涂层。

14.The emittance of a black body is considered to be one.

黑体的发射率被认为是1。

作文

In the realm of physics and engineering, understanding the concept of emittance is crucial for various applications, particularly in thermal radiation and material science. Emittance refers to the efficiency with which a surface emits thermal radiation compared to that of a perfect black body at the same temperature. This property is vital when designing systems that involve heat transfer, such as radiators, thermal insulators, and even spacecraft. The higher the emittance of a material, the more effective it is at radiating heat, which can significantly influence energy efficiency in numerous applications. For instance, consider the design of a solar panel. Engineers must carefully select materials with appropriate emittance values to optimize the panel's performance. A material with a high emittance will lose heat quickly, which can be advantageous in certain scenarios where cooling is necessary. Conversely, if the goal is to retain heat, materials with low emittance are preferred. This delicate balance highlights the importance of understanding emittance in practical applications. Additionally, emittance plays a significant role in environmental science. Urban areas often experience the 'urban heat island' effect, where cities become significantly warmer than their rural surroundings due to human activities and the materials used in construction. By selecting materials with lower emittance, city planners can mitigate this effect, promoting cooler urban environments that reduce energy consumption for air conditioning and improve overall quality of life. In the context of building design, architects and engineers are increasingly considering emittance when selecting materials for roofs and walls. For example, reflective roofing materials with low emittance can help keep buildings cooler during hot weather, thereby reducing energy costs associated with cooling systems. This approach not only benefits individual buildings but also contributes to broader efforts to combat climate change by decreasing overall energy demand. Moreover, the concept of emittance extends beyond just thermal management; it also intersects with the fields of optics and photonics. In these areas, emittance can affect how materials interact with light, influencing optical properties such as reflectivity and absorption. Understanding how emittance varies across different wavelengths of light can lead to advancements in technologies like photovoltaic cells and LED lighting. In conclusion, emittance is a multifaceted concept that holds significant importance across various fields, including engineering, environmental science, and optics. By grasping the principles of emittance, professionals can make informed decisions that enhance energy efficiency, promote sustainability, and lead to innovative solutions in technology and design. As we continue to face challenges related to energy consumption and environmental impact, the role of emittance will undoubtedly remain a critical consideration in our quest for a more sustainable future.

在物理和工程领域，理解发射率这一概念对于各种应用至关重要，特别是在热辐射和材料科学中。发射率指的是表面在相同温度下与完美黑体相比发射热辐射的效率。这一特性在设计涉及热传递的系统时至关重要，例如散热器、热绝缘材料甚至航天器。材料的发射率越高，它发射热量的能力就越强，这可能会显著影响许多应用中的能效。 例如，考虑太阳能电池板的设计。工程师必须仔细选择适当的发射率值材料，以优化电池板的性能。具有高发射率的材料会迅速散失热量，这在某些需要冷却的情况下是有利的。相反，如果目标是保持热量，则更倾向于使用低发射率的材料。这种微妙的平衡突显了在实际应用中理解发射率的重要性。 此外，发射率在环境科学中也扮演着重要角色。城市地区常常经历“城市热岛”效应，即城市由于人类活动和建筑材料的使用而变得明显比周围农村地区更温暖。通过选择低发射率的材料，城市规划者可以减轻这种效应，促进更凉爽的城市环境，从而减少空调的能源消耗，提高整体生活质量。 在建筑设计的背景下，建筑师和工程师越来越多地考虑在选择屋顶和墙壁材料时的发射率。例如，具有低发射率的反射屋顶材料可以帮助在炎热天气中保持建筑物的凉爽，从而减少与制冷系统相关的能源成本。这种方法不仅对单个建筑物有益，还有助于更广泛的应对气候变化的努力，通过减少整体能源需求。 此外，发射率的概念不仅限于热管理；它还与光学和光子学领域交叉。在这些领域中，发射率会影响材料与光的相互作用，从而影响反射率和吸收等光学特性。理解发射率在不同光波长下的变化，可以推动光伏电池和LED照明等技术的进步。 总之，发射率是一个多面向的概念，在工程、环境科学和光学等多个领域具有重要意义。通过掌握发射率的原理，专业人士可以做出明智的决策，提升能效，促进可持续发展，并在技术和设计中寻求创新解决方案。随着我们继续面临与能源消费和环境影响相关的挑战，发射率的作用无疑将继续成为我们追求更可持续未来的重要考虑因素。