【摘 要】
：
Daylighting structures,including solar cells and building windows,utilize sunlight whilst suffering from undesired solar heat and outdoor dust contamination.A radiative cooling system that is transparent to sunlight and has a superhydrophobicsurface would
【机 构】
：
Institute for Advanced Ceramics,Harbin Institute of Technology,Harbin 150080,China;Key Laboratory of
论文部分内容阅读
Daylighting structures,including solar cells and building windows,utilize sunlight whilst suffering from undesired solar heat and outdoor dust contamination.A radiative cooling system that is transparent to sunlight and has a superhydrophobicsurface would cool and clean the daylighting structures in a sus-tainable manner.However,the majority of the current daytime radiative cooling systems were designed to fully reflect the incident sunlight to maximize the cooling power.In this work,we optimized both the sunlight transmission and infrared thermal irradiation by modeling the size-dependent scattering and ab-sorption of light by SiO2 spheres embedded in a polymer matrix,we found that the use of nanospheres(20 nm) enabled both high sunlight transmittance (＞ 90％) and infrared emissivity (～0.85).This theo-retical prediction was confirmed by experimental measurements of a solution-processed nanocomposite film.When coated on a solar cell,the as-prepared film not only preserved the power conversion effi-ciency of the cell (14.71％,uncoated cell has an efficiency of 14.79％) but also radiatively cooled the cell by up to 5 ℃ under direct sunlight.This reduction of the operating temperature of the solar cell further enhanced its electrical power output,evidenced by an increase in the equilibrium temperature of the LED load by about 14 ℃.The nanoscale textured surface formed by the nanospheres further led to su-perhydrophobicity and thus excellent self-cleaning performance (efficient removal of dust by wind and/or water droplets).
其他文献
In order to improve mechanical properties of 6082 aluminum alloy,the SiCp/Al 6082 composites were prepared by the addition of the micron-sized SiC particles combined with the squeeze casting.The effects of the SiCp content and squeeze casting on the micro
Contact-killing antimicrobial coatings based on host defense peptides (HDPs) and their synthetic mimics have shown potential as powerful tools to combat implant-associated infections.Covalent modification of the antimicrobial surface has been utilized to
Four-dimensional (4D) printing technology is an extension of three-dimensional (3D) printing technology that enables a 3D-printed static structure to dynamically change its shape with time.Therefore,the re-sulting structure can undergo self-folding/unfold
信息技术的快速发展使视频成为目前应用最广泛的信息载体之一,互联网中的视频类型众多、质量不一,对视频处理算法提出了更高要求,视频目标分割作为关键的视频处理技术,是计算机视觉应用中的基础任务之一。按照用户参与度可将视频目标分割方法分为三种:无监督、半监督和交互式,其中无监督是对显著目标自动分割,半监督是给定前几帧中的目标模板,而交互式的用户参与处于无监督和半监督之间。半监督方法的实际应用范围更广泛。目
Mg-Al-Zn-Ca-Y alloys with excellent ignition and corrosion resistances-termed SEN alloys (where the letters “S,” “E,” and “N” stand for stainless,environmentally friendly,and non-flammable,respectively)-have been developed recently.In this study,the micro
Polysynthetic twinned (PST) TiAl single crystal possesses great potentials for high-temperature applica-tions due to its excellent combination of strength,ductility and creep resistance.However,a critical prop-erty for high-temperature application of such
半刚性基层沥青路面由于其优良的路用性能被广泛使用于国内高等级公路中,但是其本身存在的反射裂缝问题至今尚未解决。已有的研究资料表明在中国北方地区有许多修筑好的半刚性基层沥青路面经过一个或两个冬天后,路表会出现大量横向裂缝,这些裂缝会加速沥青路面的损坏,导致道路的使用寿命大大降低。国内外对半刚性基层沥青路面的开裂问题进行了许多研究,但对于沥青路面的反射裂缝的防治仍存在许多问题尚未解决。本文采用有限元模
日益增加的交通拥堵问题和环境问题,给城市带来更多的压力,阻碍着城市进一步发展。于此同时中共中央、国务院决定设立国家级新区河北雄安新区,为了“构建快捷高效交通网,打造绿色交通体系”,雄安新区管委会明确提出新区未来绿色交通出行比例达到90%,公共交通占机动化出行比例达到80%。但是当居民出行较为分散,出行规模较小时,设置传统公交会造成经济上和资源上的浪费,不设置公交线路会造成居民私家车规模增大,与绿色
站点的布设在轨道交通与常规公交的前期的规划设计中是重要的一环。但是以轨道交通站点为中心构成的吸引辐射圈内,常规公交站点的布局较为混乱,没有明确的布设范围,缺乏与居民出行热点的结合,没有充分考虑到乘客的步行换乘距离。本文在此背景下,基于出租车热点分析,考虑出行换乘时间成本,对轨道站点步行辐射区域内的常规公交站点布局进行研究。本文在对轨道交通站点的吸引范围理论的研究之上,分析在不同的轨道交通客流辐射范
The effects of Ni addition on the mechanical properties,corrosion behaviors,and corrosion mechanism of MgGd1Nix alloys have been investigated by compressive tests,weight loss,hydrogen evolution,and scanning electron microscopy.The results show that the co