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相关概念视频

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Adaptations that Reduce Water Loss01:57

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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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Membrane Fluidity01:23

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Responses to Heat and Cold Stress02:45

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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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相关实验视频

Updated: May 30, 2025

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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一个类似叶子的结构膜,用于高效和持续的辐射冷却.

Minghan Wu1,2, Yu Li1,2, Gang Huang1,2

  • 1Key Laboratory of Polymer Processing Engineering of the Ministry of Education, National Engineering Research Center of Novel Equipment for Polymer Processing, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, People's Republic of China. guizhenzhang@scut.edu.cn.

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概括
此摘要是机器生成的。

这项研究引入了一种新型的双层被动辐射冷却 (PRC) 膜,可以克服紫外线降解. 以叶子为灵感的设计实现了高冷却性能和耐用性,用于实际应用.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 可持续能源 可持续能源

背景情况:

  • 无源日间辐射冷却 (PRC) 是减轻全球变暖影响的一个有前途的技术.
  • 目前的中国材料在平衡高冷却效率与长期紫外线 (UV) 耐用性方面存在局限性.
  • 紫外线降解损害了现有的辐射冷却解决方案的性能和寿命.

研究的目的:

  • 开发一种新型的双层被动辐射冷却 (PRC) 毛孔膜,具有增强的紫外线耐用性和高冷却性能.
  • 为应对中国材料中紫外线降解的关键挑战.
  • 创建一个具有成本效益和可扩展的解决方案,用于被动冷却.

主要方法:

  • 制造一个双层多孔膜,上面有明显的保护层和底层冷却层.
  • 在上层加入反射紫外线的无机颗粒,在底层加入光学特征的颗粒.
  • 在加速紫外线辐射测试下评估光学性能 (太阳反射率,MIR发射率) 和机械稳定性.

主要成果:

  • 开发的中国膜具有99.3%的高太阳反射率和约95%的中红外 (MIR) 发射率.
  • 膜在暴露于7000MJm-2的紫外线辐射后,表现出极好的光学和机械稳定性.
  • 类似叶子的结构和协同粒子效应有助于卓越的性能和耐用性.

结论:

  • 这种新型的双层PRC膜有效地克服了传统辐射冷却材料的紫外线耐用性限制.
  • 独特的结构设计和卓越的综合性能为中国技术的广泛实际应用铺平了道路.
  • 这一进步为能源效率和热管理提供了可持续的解决方案.