Microstructure of ferrospheres in fly ashes: SEM, EDX and ESEM analysis     

Qing-feng Xue  Sheng-gao Lu 《浙江大学学报(A卷英文版)》2008,9(11):1595-1600

Ferrospheres in fly ashes from a coal-fired power plant were extracted by a magnetic separation technique and their microstructure was studied by scanning electron microscopy （SEM）, energy dispersive X-ray analysis （EDX） and environmental scanning electron microscopy （ESEM）. Ferrospheres in fly ashes show significant iron enrichment compared to their respective fly ashes. Iron oxides in ferrospheres mainly occur as minerals magnetite （Fe3O4） and hematite （α-Fe2O3）, which are derived mainly from the decomposition and oxidation of iron-bearing minerals in coal during combustion. EDX data indicate that ferrospheres also contain Si, S, Al and Ca resulting from quartz, mullite, anhydrite and amorphous materials. A large percentage of ferrospheres are commonly 5-50 μm in size. The microstructure of ferrospheres includes smooth, polygonal, dendritic, granular and molten drop characteristics. SEM coupled with EDX provided fast and accurate results of the microstructure and chemical composition of ferrospheres, and helped us to assess environmental issues related to the disposal and utilization of fly ashes.  相似文献   

浅谈如何做好图书流通管理工作   总被引：4，自引：0，他引：4  

齐晓伟  崔勇 《乌鲁木齐职业大学学报》2006,15(1):114-116

图书流通是图书馆为读者提供服务的最基本途径,其管理工作的质量直接影响着图书馆价值的实现。针对图书流通过程中藏书管理、软硬件管理和馆员管理环节中存在的问题,提出解决对策,对做好图书流通管理工作有一定裨益作用。  相似文献   

Simulation framework for teaching in modeling and simulation areas     

Marisa Raquel De Giusti  Ariel Jorge Lira  Gonzalo Luján Villarreal 《European Journal of Engineering Education》2008,33(5-6):587-596

Simulation is the process of executing a model that describes a system with enough detail; this model has its entities, an internal state, some input and output variables and a list of processes bound to these variables. Teaching a simulation language such as general purpose simulation system (GPSS) is always a challenge, because of the way it executes the models and the abstraction level it can achieve, very different compared with most well-known programming languages. This article presents an open source simulation framework that implements a subset of entities of GPSS, which could help students to improve the understanding of this language. This tool also stores all entities of simulations in every single simulation time, which is very useful for debugging simulations, but also for getting a detailed history of all entities in the simulations, knowing exactly how they have behaved in every simulation time.  相似文献   

Construction simulation and real-time control for high arch dam   总被引：1，自引：0，他引：1  

钟登华  任炳昱  吴康新 《天津大学学报(英文版)》2008,14(4):248-253

A method of combining dynamic simulation with real-time control was proposed to fit the randomness and uncertainty in the high arch dam construction process. The mathematical logic model of high arch dam construction process was established. By combining dynamic construction simulation with schedule analysis, the process of construction schedule forecasting and analysis based on dynamic simulation was studied. The process of real-time schedule control was constructed and some measures for dynamic adjustment and control of construction schedule were provided. A system developed with the method is utilized in a being constructed hydroelectric project located at the Yellow River in northwest China, which can make the pouring plan of the dam in the next stage (a month, quarter or year) to guide the practical construction. The application result shows that the system provides an effective technical support for the construction and management of the dam. ZHONG Denghua, born in 1963, male, Dr, Prof. Supported by National Natural Science Foundation of China(No.50539120), National Basic Research Program of China(“973”Program,No. 2007 CB714101), National Science Fund for Distinguished Young Scholars of China(No.50525927), and National Natural Science Foundation of China (No.50579045).  相似文献   

煤灰合成A型分子筛之研究     

武志富  黄亮 《安阳师范学院学报》2002,(2):30-30,68

以合适煤灰为原料通过粉碎，水热合成等手段，制取分子筛，总结出合成的最佳工艺参数。  相似文献   

香烟灰对氯酸钾催化分解制氧气的实验研究     

廖政达  喜文敏 《柳州师专学报》2004,19(1):123-124

介绍了用香烟灰代替二氧化锰作催化剂，在实验室用氯酸钾制取氧气的新方法，并对香烟灰的成分和催化机理进行了初步分析和探讨。  相似文献   

舟坝水电站碾压混凝土重力坝温控与防裂     

刘儒博  张少卫  桂粉歌 《杨凌职业技术学院学报》2007,6(3):44-45

结合舟坝水电站碾压混凝土重力坝施工实际，总结出碾压混凝土坝的温控与防裂、特殊天气处理措施等，对碾压混凝土重力坝施工具有一定的借鉴价值。  相似文献   

用粉煤灰替代部分粘土原料生产32.5R普通水泥     

陈潮华 《闽西职业技术学院学报》2007,9(2):86-88

生产实践表明,通过优化原材料的配方,改进工艺过程,利用粉煤灰,替代部分粘土原料,稳定生产32.5R普通硅酸盐水泥是可能的。  相似文献   

水电站坝体基础结构施工过程及结构分析   总被引：1，自引：0，他引：1  

郭征红  徐伟 《福建工程学院学报》2004,2(1):56-60,84

依据现行水利电力工程规范规定的方法扣原则，对水电站坝体基础结构进行结构形式扣施工过程的方案设计，并对各方案作有限元结构应力及可靠度分析，以比较方案及选择坝体尺寸。  相似文献   

运用系统论观点认识淤地坝系及其优化规划     

付强  杨红新  史学建  韩慧霞 《平原大学学报》2007,24(3):122-124

本文从系统论的观点出发,对淤地坝系概念进行了初步探讨。同时结合系统论相关原理分析了淤地坝系的特点,并建立了坝系层次概念模型。最后,运用系统论思想探讨了淤地坝系规划的原则,并进一步探讨了非线性规划和系统仿真技术相结合的淤地坝系优化规划方法。  相似文献