SiC对MgO-CaO-C耐火材料抗氧化性能的影响

以SiC为抗氧化剂添加至MgO-CaO-C耐火材料中,研究了SiC对提高MgO-CaO-C耐火材料抗氧化性能的作用及抗氧化机理.通过TG-DSC、XRD、显气孔率测定以及近似计算氧化层面积等进行分析和鉴定.结果表明:加入SiC后MgO-CaO-C耐火材料的抗氧化性能得到显著提高,结构更加致密.材料中SiC大约在1210℃开始与氧气反应,反应后生成的SiO2继续和MgO反应生成镁橄榄石,从而填充气孔形成致密氧化层阻止碳的进一步氧化.     

Study on shock wave-induced cavitation bubbles dissolution process

This study investigated dissolution processes of cavitation bubbles generated during in vivo shock wave(SW)-induced treatments. Both active cavitation detection(ACD) and the B-mode imaging technique were applied to measure the dissolution procedure of bi Spheres contrast agent bubbles by in vitro experiments. Besides, the simulation of SW-induced cavitation bubbles dissolution behaviors detected by the B-mode imaging system during in vivo SW treatments, including extracorporeal shock wave lithotripsy(ESWL) and extracorporeal shock wave therapy(ESWT), were carried out based on calculating the integrated scattering cross-section of dissolving gas bubbles with employing gas bubble dissolution equations and Gaussian bubble size distribution. The results showed that(i) B-mode imaging technology is an effective tool to monitor the temporal evolution of cavitation bubbles dissolution procedures after the SW pulses ceased, which is important for evaluation and controlling the cavitation activity generated during subsequent SW treatments within a treatment period;(ii) the characteristics of the bubbles, such as the bubble size distribution and gas diffusion, can be estimated by simulating the experimental data properly.     

基于Server GIS的城镇地籍信息系统的设计与实现

为了更好地满足地理空间信息共享的需求,提高地理空间数据的资源利用率,在分析现有GIS行业应用软件架构的基础上,结合Server GIS技术,提出了一种集成C/S架构和B/S架构应用系统GIS功能的复合架构模式,并将其应用于国土资源行业城镇地籍信息系统的架构改造实践中,将原有单一架构系统进行了子模块划分,各个模块所需的GIS功能由服务器端的GIS服务器统一提供.原型系统试运行良好,基本达到预期的目标,较好地解决了单一架构模式系统存在的问题,满足了地理空间信息共享的需求,为其他行业GIS应用系统的建设提供了思路.