Rheological and fractal characteristics of granular sludge in an upflow anaerobic reactor

The rheological and fractal characteristics of the granular sludge in an upflow anaerobic sludge blanket (UASB) reactor were investigated in this study. The influences of sludge concentration and temperature on the rheological properties of the granular sludge were evaluated, and the Bingham model was adopted to describe its rheology. In addition, image analysis was used to determine the sludge fractal dimension. The results indicate that the UASB granular sludge showed a shear-thinning behavior. The relationships between the limiting viscosity and the sludge concentration, as well as the limiting viscosity and temperature could be respectively modeled using an exponential equation and Arrhenius equation well. The Bingham model was able to adequately describe the rheology of the granular sludge. The fractal dimension of the granular sludge, 2.79+/-0.03, was larger than that of some other aggregates, suggesting that the granular sludge were more compact and denser. Furthermore, the relationship between rheological and fractal properties of the granular sludge could be properly described with the model proposed by Shih et al. [1990. Scaling behavior of the elastic properties of colloidal. Phys. Rev. A 42, 4772-4779].     

某制粉车间框架结构混凝土性能检测及分析

通过对面粉厂六层框架结构混凝土性能进行了全面检测，并从施工、原材料、环境、荷载几方面分析了混凝土裂缝产生的原因，提出了框架梁开裂的修补和加固方案。     

Excel在造价工程中的应用

通过简单的实例,介绍了Excel在建筑工程造价中的多种应用,简化了大量繁琐的重复的计算。     

某民航售票楼墙体裂缝事故的分析与处理

论述了一个具体的地基处理及基础加固实例。指出在处理此问题时，首先要搞清引起结构破坏的主要原因，然后据此采取设计及施工措施，才能使加固成功。     

某住宅楼桩基工程事故分析与处理

本文介绍某住宅楼桩基工程质量事故原因分析，并根据桩土共同受力的原理，采用加宽承台并在承台下设砂垫层的方法，进行加固处理，效果较好。     

75系列塑钢推拉窗的性能特点及安装施工

阐述了７５系列塑钢推拉窗的特点和性能介绍了该窗的安装施工。     

Probabilistic calculation for the bed under an individual foundation in accordance with the second group of limiting states

Conclusions 1. The method proposed for the probabilistic design of beds makes it possible to obtain a well-founded design solution corresponding to a given reliability level, which, in many cases, is more economic than the solution recommended in the Construction Rules and Regulations. 2. The design solution adopted as a result of the calculation set forth in the Construction Rules and Regulations possesses a reliability level, which, for some unknown reason, is on the high side. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 18–20, March–April 1991.     

推动城市经济发展的“引擎”——江西华东装潢建材博览城项目的启示

临近岁末,在江西南昌市昌南工业区发生了一件轰动全城的事情。一个规划占地约500亩,包括板材、型材、金属材料、陶瓷、五金、涂料、石材批发市场和以室内装潢为主的家居广场,经营规模位居华东之首的华东装潢建材博览城项目正式启动。这个项目的规划方案刚刚公布,全市数百家建材     

预制楼板板缝宽度及平整度的控制方法

针对预应力楼板在施工中存在的质量通病，介绍了对预制楼板板缝宽度及找平的控制方法，有效地防止楼板裂缝的产生，提高室内地面、屋顶粉刷的平整度。     

The impact of preoxidation of SAS on biosorption efficiency on activated carbon

We have studied the process of a prolonged dynamic filtration on activated carbon in two biosorption systems — without preoxidation treatment of the initial matter and after ozonization. It has been shown that given the uniform load on activated carbon terms of the organic matter the efficiency of the biosorption process after preozonization is 2.3 times as small compared with that that without pretreatment, which correlates with the change of adsorption free energy.