Formation of the spherical reticulated mega-structure and its stabilities in construction

The spherical reticulated mega-structure, an innovative structure, is presented and studied in this paper. The formation method, form parameters and support style are first investigated. Based on the traditional construction methods of spatial structure, the feasible construction and erection method of this kind of structure is analyzed, and different erection sequences of the structure as well as the settings of temporary supports are proposed. The stabilities of the structure in the process of erection are then studied by both linear and nonlinear methods in detail. The effective settings of the temporary supports and reasonable erection sequence of the substructures are obtained, and some recommendations on erection are presented. This work will provide guidance in theory for construction and erection of this kind of structure.     

钢管-钢管混凝土复合提篮拱桥的受力性能分析

钢管-钢管混凝土拱桥是最近提出的一种较新型的结构形式,其受力性能和传统的钢管混凝土拱桥和钢管拱桥有很大的不同。拱肋内倾角和拱脚混凝土灌注高度是钢管-钢管混凝土提篮拱设计中的两个重要参数,他们对于成桥结构的内力、稳定和动力特性都有很大的影响。文中借助通用有限元程序,基于一座跨径150m的中承式钢管-钢管混凝土复合提篮拱,对以上影响因素进行了分析。     

Stable zirconium hydrogen phosphate-silica nanocomposite membranes with high degree of bound water for fuel cells

Zirconium hydrogen phosphate (ZrP)-silica nanocomposite polymer electrolyte membranes (PEMs) were prepared by sol-gel method in aqueous media. Hydrophilic and hydrophobic regions of PEMs were tailored by molecular level of architecture to introduce proton conducting pathways and methanol impervious nature. ZrP-silica nanocomposite PEMs showed improved thermal, mechanical, oxidative and hydrolytic stabilities along with high conductivity, methanol retention capacity, which are essential requirements. Furthermore, high degree of bound water content in membrane matrix indicates suitability of reported PEMs under anhydrous or low-humidity conditions. These PEMs were well processed as self-supporting film, and exhibited high selectivity parameter in comparison to Nafion117 membrane for direct methanol fuel cell (DMFC) applications.     

辣椒红色素的稳定性及在食品中的应用研究

研究了辣椒红色素的稳定性以及在食品中的应用.研究发现,辣椒红色素对热稳定;辣椒红色素在pH=2-12之间色素稳定;在暗室和室内光线下,色素无褪色现象,在日光下不到半天的时间色素几乎损失殆尽,紫外光对色素有明显的影响;Cu2 与色素发生反应,色泽改变,其它金属离子(Sn2 、Al3 )浓度大于300mg.ml-1对色素有一定影响;辣椒红色素对还原剂和防腐剂稳定,对氧化剂不稳定.本文还研究了辣椒红色素在食品中的着色及稳定性.     

沙棘果黄色素稳定性的研究

本文研究了沙棘果黄色素的稳定性。研究发现：沙棘果黄色素在80℃以下稳定;酸性条件下稳定;对还原剂和各种食品添加剂稳定;光照条件下不稳定;对氧化剂不稳定。沙棘果黄色素在食品中的应用前景良好。     

茶绿色素提取工艺研究

本研究在单因子试验的基础上,采用四因素三水平正交试验设计对茶绿色素浸提工艺参数进行了系统的研究．结果表明：采用90％的乙醇,13ml：1g的醇茶比,65℃水浴浸提60min,浸提效果最佳,浸出率为22．59%。茶绿色素含有丰富的茶多酚、咖啡碱、氨基酸等有效成分,是一种优良的天然食用色素。