A simple method for the fabrication of silica-based superhydrophobic surfaces

The present article reports on a simple and convenient method for the fabrication of superhydrophobic surfaces based on silica particles by spraying the as-prepared silica suspension containing silica sol and silica microspheres on the substrate. The morphologies of the silica particulate coatings could be controlled by varying the silica microsphere concentration. The silica particulate coatings as prepared were exceptionally rough and superhydrophilic, with water contact angles less than 5°. The surface silanol groups of the hydrophilic coatings could be functionalized using 1H,1H,2H,2H-perfluorodecyltriethoxysilane to form hydrophobic groups. The resulting surface showed excellent superhydrophobic property with water contact angle up to 165.6 ± 0.9° and sliding angle of 3.5 ± 0.4°. In addition, the superhydrophobicity of the coating possessed a good stability after 3 months of exposure in air for a wide range of pH values.     

Design of dual-diameter nanoholes for efficient solar-light harvesting

A dual-diameter nanohole (DNH) photovoltaic system is proposed, where a top (bottom) layer with large (small) nanoholes is used to improve the absorption for the short-wavelength (long-wavelength) solar incidence, leading to a broadband light absorption enhancement. Through three-dimensional finite-element simulation, the core device parameters, including the lattice constant, nanohole diameters, and nanohole depths, are engineered in order to realize the best light-matter coupling between nanostructured silicon and solar spectrum. The designed bare DNH system exhibits an outstanding absorption capability with a photocurrent density (under perfect internal quantum process) predicted to be 27.93 mA/cm², which is 17.39%, 26.17%, and over 100% higher than the best single-nanohole (SNH) system, SNH system with an identical Si volume, and equivalent planar configuration, respectively. Considering the fabrication feasibility, a modified DNH system with an anti-reflection coating and back silver reflector is examined by simulating both optical absorption and carrier transport in a coupled way in frequency and three-dimensional spatial domains, achieving a light-conversion efficiency of 13.72%.

PACS

85.60.-q; Optoelectronic device; 84.60.Jt; Photovoltaic conversion     

EPS颗粒-EPS板复合保温墙板的热工性能研究

研发了一种EPS颗粒与EPS板相结合的复合保温墙板,并对5种规格型号的EPS颗粒-EPS板复合保温墙板的传热阻R0、传热系数K、蓄热系数S及热惰性系数D进行了试验研究。结果表明,该复合保温墙板的热工性能符合吉林省地方标准DB22/T 450—2007《居住建筑节能设计标准》及DB22/T 436—2006《公共建筑节能设计标准》热工性能方面的相关规定,具有较高的推广应用价值。     

电梯补偿装置的设置探讨

从实例出发,分析了电梯增设补偿装置对改善曳引条件的作用．探讨了补偿装置与缓冲器之间的对应关系。经分析得出结论：高层电梯应设置补偿装置,以满足曳引条件,同时电梯补偿装置的最低点应低于缓冲器完全压缩后的最高点。以确保电梯的安全使用。     

国家标准《沥青基防水卷材单位产品能源消耗限额》解读

介绍了国家标准《沥青基防水卷材单位产品能源消耗限额》的制定背景、任务来源和编制概况,详细阐述了各类限额指标及其确定原则,对各类能耗的统计和计算进行了说明.     

肋环型索穹顶结构静力计算的等效平面桁架方法

选取轴对称肋环型索穹顶结构的1条肋,用等效径向索代替环向索,将其等效为一次超静定平面桁架结构。选取最内撑杆上端点径向力为约束力,推导力法求解约束力的计算公式;提出小变形时各点位移计算的位移传递法和计算公式;在用力法计算出各杆件内力后,就可以通过传递矩阵由外到内计算各点的位移值。此外,对初始预应力产生的应力刚化刚度增大和索自重垂度产生的刚度减小进行定性和定量分析。最后,通过一个算例介绍所提方法的计算过程并与有限元计算结果进行比较,验证该方法的正确性和准确性。     

基于国产钢材的新型分阶段软钢耗能装置性能研究

基于国产钢材良好的耗能性能,提出一种新型的软钢耗能装置,此耗能装置不仅具有全截面同时屈服的特性,还具有分阶段耗能的特点。通过有限元软件ABAQUS对该新型耗能装置及其重要组成部件———单片耗能钢片分别进行线性加载、滞回加载以及疲劳加载,对其耗能机理、力学性能、耗能性能及疲劳性能进行分析研究。结果表明:此新型耗能装置滞回曲线饱满,耗能性能优越,分阶段耗能特点明显,且性能稳定,具有广阔的应用前景。     

建筑装修施工管理中的常见问题及改进对策

伴随着经济的不断发展,人们对自身居住环境的要求越来越高,其中房地产的发展和现代建筑行业的兴起也在一定程度上推动着房屋装修事业的日益兴盛。但是,其中也存在着许多的问题。对此,本文将针对建筑装修施工管理过程中所存在的问题和解决对策进行简要阐述。     

有关桥梁桩基试验与其检测探索

桥梁检测在桥梁的维修和养护工作中具有重要作用,桥梁维修和加固方案的制定以桥梁检测为基础。本文从桥梁桩基静载试验内容、常用检测技术和桥梁桩基静载试验三个方面,对有关桥梁桩基试验与检测进行了探索。