Strength and workability of masonry mortars manufactured with ladle furnace slag

Ladle furnace basic slag (LFS) is a by-product of the steelmaking process. It has rarely been recovered in the past and is usually disposed of in landfill sites. Despite containing stable chemical substances of great quality, some of which are potentially hydraulic, its practical applications have been limited. This paper discusses the attractive option of using LFS in the manufacture of masonry mortars for use in the construction industry, which requires an analysis of the principal characteristics of such mortars, i.e. workability and mechanical strength. It reports on a comparative study, using standard commercial admixtures, between conventional masonry mortars and mortars manufactured with LFS as a partial replacement for sand and cement, the results of which imply considerable economic savings in sand and cement, improvements in the properties of the mortars and in overall sustainability, by avoiding disposal and conserving natural resources.     

MapBasic在震害评估应用中的一个问题

利用MapBasic编制震害评估软件时 ,无现成的工具直接绘制出长短轴不平行 (或不垂直 )于经纬度线的等烈度线。本文提出了一个通过椭圆旋转绘制出所要求的等烈度线椭圆的方法。     

安全减灾业的基础性研究及量化模式──兼论安全减灾数学理论方法的体系建设

国家标准ＧＢ／Ｔ１３７４５－９２即《学科分类与代码》及国内外安全减灾的科学实践表明，安全减灾科学由学科群构成，具有综合性、整体性及学科相对独立性，其基础理论研究及建设至关重要。这门科学发展迟缓除了管理原因外，缺乏基础性研究和学科建设是主因之一。据此，重点论证加强安全减灾业基础性研奖的必要性，并从建立安全减灾量化模式及数学体系试作探讨。     

从基础产业的观点探讨防洪对策

本文从水利是国民经济基础产业的角度阐述了防洪建设是具有战略意义的基础产业.文中提出了未来洪灾损失具有逐步加大的趋势与特点。针对我国防洪现状,提出在国民经济建设中,防洪建设必须超前发展,以及应采取的全面综合防洪对策。     

南岳森林土壤的研究——Ⅰ.基本特点和土壤紧实度

本文介绍了南岳的自然条件以及森林土壤的基本特点如酸碱度、土壤含水量、比重、浸水容重、质地、有机质、有效氮、速效磷、速效钾等情况。作者首次应用定量方法即回归分析研究了土壤紧实度与土壤层次、结构及其有机质含量的关系,还讨论了土壤侵蚀和人畜践踏对土壤紧实度的影响。     

环保查询分析决策系统的研发

环保查询分析决策系统基于电子地图和数据库,能同时操纵数据库和AutoCAD,使得查询系统既实用又有效率.随着IT产业的迅猛发展,信息化办公手段也日益成熟完善.计算机的利用率逐步提高,逐渐成为人们日常工作和生活中不可缺少的一部分.近些年来,环境保护工作的不断深入,为提高机关工作效率,按照党的"十六"大提出的机关办公的电子化的要求,开始研究环保查询分析决策系统.《环保查询分析决策系统》的研制开发,就是为了适应新形势和新工作,将电子地图、数据库和环境管理的内容结合在一起,为环境管理提供技术支持和科学依据,为区域环境管理的查询分析决策提供技术支持.     

碱式氯化铝生产工艺改革实践

针对传统碱式氯化铝生产的固液分离难，盐基度低，设备防腐难等问题，改用碳酸铝替代结晶氢氧化铝，并引进铝，钙复合料调适盐基度，实现了易溶，节能，产品盐基度高的目的，使该生产厂ＰＡＣ生产开创新局面。     

黄孢原毛平革菌对碱性紫5BN的脱色降解研究

目的 建立黄孢原毛平革菌与10、50、100mg/L碱性紫5BN的共培养体系,研究菌种和培养条件对脱色降解效果的影响。方法 采用分光光度法测定培养液最大吸收波长处吸光度的改变,确定染料的脱色率及降解率。结果 (1)OGC101菌株的降解能力明显强于BKM-F-1767菌株,培养液最大吸收波长向短波方向移动,说明染料的N-去甲基化和降解中间物的形成;(2)琥珀酸钠缓冲液、04mM藜芦醇(VA)、浅层静置培养的参数组合较佳;(3)共培养30d后,各样品的脱色降解率为54％-98％;(4)染料浓度与脱色降解效应的相关性,因菌种而异。     

纳米TiO2的制备及其对碱性品绿染料废水的降解

采用溶胶-凝胶法制备了纳米TiO2颗粒,并用SEM和XRD对其进行了表征.以高压汞灯为光源,以纳米TiO2为光催化剂降解碱性品绿废水.研究了光源性质、催化剂的加入量、溶液pH值、碱性品绿的初始质量浓度对碱性品绿降解率的影响.研究结果表明,在高压汞灯照射下、TiO2质量浓度为0.4 g·L-1,pH值为7、碱性品绿质量浓度为2 mg·L-1、光照时间为120 min的条件下,碱性品绿降解率达93.6%.     

On the basic reproduction number and the topological properties of the contact network: An epidemiological study in mainly locally connected cellular automata

We study the spreading of contagious diseases in a population of constant size using susceptible-infective-recovered (SIR) models described in terms of ordinary differential equations (ODEs) and probabilistic cellular automata (PCA). In the PCA model, each individual (represented by a cell in the lattice) is mainly locally connected to others. We investigate how the topological properties of the random network representing contacts among individuals influence the transient behavior and the permanent regime of the epidemiological system described by ODE and PCA. Our main conclusions are: (1) the basic reproduction number (commonly called _R0$R_0$) related to a disease propagation in a population cannot be uniquely determined from some features of transient behavior of the infective group; (2) _R0$R_0$ cannot be associated to a unique combination of clustering coefficient and average shortest path length characterizing the contact network. We discuss how these results can embarrass the specification of control strategies for combating disease propagations.