Pre-assessment on the loss and impact caused by large-scale flood disasters

Through intensive studies, we have established an index system for evaluating the loss and impact caused by large-scale flood disasters, and constructed a methodological system for pre-assessing the loss and impact caused by large-scale flood disasters. Through numerical simulation, submerged characteristics of large-scale flood can be determined. According to the characteristics of spatial corresponding distribution between land-use types and types of disaster-affecting subjects, we have realized spatialization for social and economic statistic data, and have completed spatialization evaluation on the loss and social impact caused by large-scale flood disasters using the spatial analytical function of GIS software. It is possible that large-scale flood can occur in the lower Yellow River. Flood management requires pre-assessment on the loss and impact caused by flood disasters. Nevertheless, there is no appropriate pre-assessment method for the lower Yellow River at present. By imitating the flood happened in Yuanyang, the north bank of the lower reach of Yellow River in 1958, we did pre-assessment on the loss and social impact caused by the overflow flood. We found that this method can be used to predict the types, quantity and spatial distribution of economic loss caused by large-scale flood disasters. This method can determine population affected by disasters and degree and spatial distribution of disasters. Indirect loss can be predicted as well using this method.In general this method can meet theneeds of regions affected by flood for planning and making decisions in fighting floods and reducing loss.     

预应力混凝土简支梁裂缝分析及研究

结合施工实践，对预应力混凝土简支梁预制过程中常见的腹板竖向裂缝、斜裂缝、纵向裂缝、水平裂缝及表面龟裂等裂缝成因进行了分析，并提出了具体的防治措施。     

工程基坑支护实例分析

芜湖市一院门诊综合楼基坑采用了钻孔灌注桩、加深层搅拌桩,止水帷幕树根桩和压密注浆等多种支护技术,既保证了施工质量,又节省了投资,取得了较好的效果。     

A Comparison between Different Approaches and Methods in Foreign Language Teaching

Different approaches and methods through history play significant roles in foreign language teaching. This paper makes a comparison of four influential approaches and methods in terms of definition, advantages and disadvantages. It is necessary to combine those approaches and methods to facilitate the development of foreign language teaching.     

半固态流变铸造研究

本文依据流变力学理论,分析探讨流变铸造机理,流变铸造特性以及晶粒细化和材料性能提高的原因,认为:半固态金属浆料具有一定的流变性和搅译性,这种特性是与材料组织和搅拌剪切力作用直接有关的.对半固态金属浆料进行机械搅拌作用.这有利于原子的迁移和扩散,有利于浆料的流动和降低组织成份的不均匀性,也有利于破坏树枝晶的形成和抑制晶粒长大. 本文还根据半固态金属浆料的组织特点建立了有关流变方程.从而,在研究揭示材料流变特性方面更趋深入。     

价值型投入产出与价格幅度变动的关系

利用价值型投入产出模型对其与价格幅度变动的关系进行了分析与讨论。     

电磁感应现象、楞次定律演示实验改进

对电磁感应现象、楞次定律演示实验做了改进 ,并介绍了自制的实验教具     

虚拟仿真系统中的声音设计

在虚拟现实或分布交互式仿真等模拟环境中，为了提高他们的逼真度和沉浸感，有必要研究声音技术的相关问题。本文结合实例，阐述虚拟仿真系统中声音设计的基本方法。     

关于多单环的根性及有限多单环

本文首先讨论了多单环的一般Ｐ一根及其商环，其次讨论了有限多单环的性质且从结构定理出发，给出｜Ｒ｜＝Ｐ３（Ｐ是素数）的所有多单环。     

风化店地区火山岩分辨率和振幅的影响因素

以风化店地区中生界火山油藏为例，分析了影响纵，横向分辨率的因素，提出了改进措施，并探讨火山岩弱反射振幅的形成机制。