Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO2 particles and SiO2 particles

Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles.The effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.     

浮选捕收剂在煤表面等温吸附数学模型的建立

利用界面化学二阶段吸附模型，建立了捕收剂在煤表面等温吸附的数学模型，以期探索捕收剂在煤表面吸附的普遍规律。     

雷州市沿海几种贝类营养成分的分析

采用微量凯氏定氮法、索氏抽提法、烘箱干燥法和等离子体发射光谱法对雷州市沿海的近江牡蛎、翡翠贻贝、栉孔扇贝、丽文蛤、毛蚶和长竹蛏等六种贝类营养成分进行分析.结果表明：六种贝类营养成分丰富,它们蛋白质含量高（平均含量为10.13%）,脂肪含量低（平均含量为2.71%）,还含有大量人体必需的矿质元素.尤其是翡翠贻贝富含微量元素Se,近江牡蛎富含Ca、Zn等元素.该分析研究为当地沿海综合利用和开发海洋贝类资源提供了营养评价的参考依据.