Structural,optical and electrical properties of indium doped Cu2ZnSn(S,Se)4 thin films synthesized by the DC and RF reactive magnetron cosputtering

Element doping into the Cu₂ZnSn(S,Se)₄ (CZTSSe) absorber is an effective method to optimize the performance of thin film solar cells. In this study, the Cu₂In_xZn_1-xSn(S,Se)₄ (CIZTSSe) precursor film was deposited by magnetron cosputtering technique using indium (In) and quaternary Cu₂ZnSnS₄ (CZTS) as targets. Meanwhile, the In content was controlled using the direct current (DC) power on In target (P_In). A single kesterite CIZTSSe alloy was formed by successfully doping a small number of In³⁺ into the main lattice of CZTSSe. The partial Zn²⁺ cations were substituted by In³⁺ ions, resulting in improving properties of CZTSSe films. Morphological analysis showed that large grain CIZTSSe films could be obtained by doping In. The well-distributed, smooth, and dense film was obtained when the P_In was 30 W. The band gap of CIZTSSe could be continuously adjusted from 1.27 to 1.05 eV as P_In increased from 0 to 40 W. In addition, the CIZTSSe alloy thin film at P_In = 30 W exhibited the best p-type conductivity with Hall mobility of 6.87 cm²V^?1s^?1, which is a potential material as the absorption layer of high-performance solar cells.     

聚氨酯泡沫塑料复合板的生产工艺及其在室内外装饰中的应用

综述了聚氨酯泡沫塑料复合板的生产工艺及其在室内装饰工程中的应用。聚氨酯泡沫塑料复合板的生产过程中,适当地加入多种助剂(如阻燃剂、发泡剂、泡沫稳定剂等)可改善和优化其各项性能。工程应用实践表明,使用聚氨酯泡沫塑料复合板可使造价下降,且不受气候、季节等因素的影响,具有较高的生产劳动率,适应旧楼的改造和新建工程,安装工艺简单,施工中采用干作业实现了零污染。     

Tough and self-healing hydrophobic association hydrogels with cationic surfactant

Hydrophobic association (HA) hydrogels with outstanding mechanical, rheological and recovery properties were successfully synthesized by micellar copolymerization of acrylamide with lauryl methacrylate. The synthesis occurred at room temperature and the synthesis condition was moderate by using the redox initiator system of Ammonium persulfate - sodium bisulfite as initiators. Cationic surfactant (dodecyl trimethyl ammonium bromide) was utilized to form micelles with hydrophobe, served as physical cross-linking points in the 3D networks of hydrogels. The HA hydrogels showed a high tensile strength of 181 kPa, superior stretchability of 2300% and excellent toughness of 2.16 MJ m⁻³. Moreover, they owned extraordinary self-recovery under different conditions. It is hopeful that the hydrogels with superior mechanical strength and self-healing properties would be applied to the fields of biomedicine and engineering. Meanwhile, based on above materials, HA hydrogels could also be synthesized with the combination of hydrophobic association and other synergistic effects, such as latex particles, electrostatic effect and nanoparticles.     

环境温度对小型断路器温升试验影响的研究

分析了环境温度对小型断路器温升试验结果的影响,并进行了相关理论推导,最后通过试验进行验证,试验结果和理论推导结论一致.     

浅析恶意代码的机理及其模型

本文从操作系统的结构性缺陷角度,阐述产生恶意代码的源头,指出当前通用PC操作系统把设备驱动、文件系统等功能都纳入系统内核,导致内核代码庞大,增加了系统保护工作的难度。并对计算机病毒的传播机理进行了形式化描述,研究了蠕虫程序的模块结构,建立了数据驱动型软件攻击的理论模型,分析了其构成威胁的本质原因。     

基于ASP的BBS通讯录系统的设计与实现

本文对BBS通讯录系统进行了分析和设计。并使用ASP语言等技术实现了该系统。     

计算机硬件教学方法改革研究

介绍了计算机硬件教学的基本情况．提出了目前存在的一些问题。通过对结合网络教学、逆向思维、软硬件结合实验三方面的改革．取得了明昱的效果。最后总结了发展的趋势。     

基于三维空间的图像加密算法

为了实现图像安全,快速加密,利用了图像像素可以插入到相邻像素之间以及拉伸折叠的思想设计了一种基于三维坐标的图像加密算法。     

传统文化在城市印象招贴设计中的运用

研究传统文化在城市印象招贴设计当中的运用,目的旨在于发掘传统文化,将传统文化与招贴设计相结合,利用招贴是传达信息的载体这一功能来对城市文化进行宣传,塑造城市的文化品牌。论文通过对传统文化在城市印象主题招贴设计当中运用的调研和分析,发现传统图形、色彩和文字在城市印象招贴设计当中的重要意义。