Study on the correlativity of earthquakes impact on cities

Introduction With rapid development and advancement of economy and society, lots of city groups or city belts with ex-tra-large cities as their centers have been formed in China. The regions these city groups lie in usually have well-developed economy, dense population, and are regional politics and culture centers. Some groups lie in the regions with high level of earthquake activity, such as the Surrounding Capital City Group with the centers of Bei-jing and Tianjin. Once a large earthqua…     

城市地震影响特征研究

首先根据历史地震目录，计算了我国34个省会城市所受到的历史地震影响. 这些城市的地震影响烈度分布特征表明，约53%的省会城市没有遭受过Ⅵ度以上的历史地震影响，遭受过Ⅶ~Ⅸ度影响的城市有44%；大部分城市Ⅵ度地震影响的发生频次均高于Ⅵ度以上地震影响；不同城市最大发生频次的地震影响烈度也不同. 为此，在确定城市地震防御烈度时，需综合考虑最大影响烈度和最频影响烈度. 本文还考虑到历史地震记录的不完备性，以福建省69个县级以上城市为研究对象，采用模拟地震目录的方法来研究城市地震影响的特征. 结果表明，不同超越概率水平下城市地震影响烈度在不同城市之间表现出较大变化，以50年超越概率2%作为城市特征地震影响烈度，可以作为城市地震防御烈度确定的依据，并据此对城市未来地震影响进行合理的描述.      

长螺旋钻机成孔压灌砼桩后插钢筋笼施工工艺及配套装置的应用

结合某一工程实例 ,探讨钻孔灌注桩先成桩后插钢筋笼法的施工工艺以及配套装置的工作原理、性能特点、适用范围和施工方法     

临汾市水资源开发利用中存在的问题及对策

本文分析了临汾市水资源开发利用中存在的问题,针对水资源现状,提出了水资源配置、建设节水型社会、调整产业结构、加强采矿排水管理、污水资源化等水资源可持续利用措施.     

The GIS and analysis of earthquake damage distribution of the 1303 Hongtong M=8 earthquake

The geography information system of the 1303 Hongton M=8 earthquake has been established. Using the spatial analysis function of GIS, the spatial distribution characteristics of damage and isoseismal of the earthquake are studies. By comparing with the standard earthquake intensity attenuation relationship, the abnormal damage distribution of the earthquake is found, so the relationship of the abnormal distribution with tectonics, site condition and basin are analyzed. In this paper, the influence on the ground motion generated by earthquake source and the underground structures near source also are studied. The influence on seismic zonation, anti-earthquake design, earthquake prediction and earthquake emergency responding produced by the abnormal density distribution are discussed. Foundation item: National important fundamental research “The Basic Research of Important Project in Damage Environment” and The important project “The Seismic Hazard Assessment Research and Anti-earthquake Structure Research” from China Earthquake Administration during the 10th Five-year Plan. Contribution No. 04FE1008, Institute of Geophysics, China Earthquake Administration.     

Bedload transport resistance in rough open‐channel flows

During bedload movement by saltation, streamwise momentum is transferred from the ?ow to the saltating grains. When the grains collide with other grains on the bed or in the ?ow, streamwise momentum is reduced, and there is a decrease in streamwise ?ow velocity and an increase in ?ow resistance, herein termed bedload transport resistance f_bt. Based on experiments in two ?umes with ?xed and mobile plane beds and previously published data, an equation is developed that may be used to predict f_bt for both capacity and non‐capacity ?ows. The variables in this equation are identi?ed by dimensional analysis and the coef?cients are determined by non‐linear regression. This equation applies to rough turbulent open‐channel ?ows, where the relative submergence is between 1 and 20 and the entire sediment load moves by saltation. An investigation of the relative magnitudes of f_bt and grain resistance f_c suggests that where dimensionless shear stress θ is less than 1 and saltation is the dominant mode of bedload transport, f_bt/f_c increases with θ but never exceeds 1. Copyright © 2004 John Wiley & Sons, Ltd.     

Stability of arsenopyrite and As(III) in low-temperature acidic solutions

Arsenopyrite is one of the most important pri-mary arsenic mineral. In the Eh-pH diagram of the As-O2-S-H2O system, if the total arsenic concentration (TAs) is taken to be 0.75 mg/L, the total sulfur con-centration, 32 mg/L, the temperature, 25℃and the pressure, one atmosphere pressure for the discrimina-tion of arsenic species, it may be found that under hy-pergene conditions, arsenopyrite is a moderately stable mineral. Only in the strongly alkaline and reducing environment can arsenopy…     

2003年7月上旬张家界特大暴雨山洪分析

对造成 2 0 0 3年 7月 8～ 1 0日张家界特大暴雨山洪的主要影响系统、物理量诊断场资料、多普勒雷达回波资料及自动气象站要素进行了分析 ,并重点分析了张家界特定的地形条件对降水的增幅作用及暴雨的夜发特征 ,为湘西北的暴雨山洪预报提供了一些有益的启示。     

国家级气象资料存储检索系统的建立

对国家级气象资料存储检索系统的需求进行了分析，进而对系统进行了功能设计，并在技术调研和分析的基础上确定了功能实现的技术路线:在数据管理方面采用数据库和文件系统相结合的方式；在存储管理方面采用分级存储管理模式，并解决了数据库的分级存储管理技术；在检索应用方面提供了程序调用式检索方式，并通过采用中间件技术实现了基于B/S结构的程序调用式检索；通过选用HPSS技术解决了由异种机型构成的高性能计算机群存储池问题；通过分别建立实时数据库和综合数据库解决了气象资料的规范化存储和实时业务使用需求之间的矛盾；在应用软件开发方面严格按照有关规范进行。     

最优气候相似法及其在降水预报中的应用

介绍了一种短期气候预测方法———最优气候相似法 ,并应用于张家界地区 1 999～ 2 0 0 2年 5～ 7月总降水预报中 ,结果显示最优气候相似法能够有效地提高短期气候的预测能力 ,特别对气候异常具有良好的反应能力 ,适合于短期气候业务预报。