地震速报参数不确定性的应急灾害损失快速评估模型

本文针对目前地震应急灾害损失快速评估中存在的问题,建立了考虑地震速报参数不确定性的灾害损失快速评估模型。并利用1990年来全国的81组速报震中与宏观震中数据。得到速报震中与宏观震中偏差的概率分布经验参数。     

Nucleation of earthquakes and its implication to precursors

IntroductionIn the middle of 1990s, the argument about nucleation phase occurred. Ellsworth and Beroza(1 995) studied the wave records of 30 earthquake events, which initiated slowly. Ellsworth, et al calledthem as nucleation phase. They discussed the relationship between their moment, duration time andthe relationship with the main shock behind. Scherbaum (1997a, b) proposed his different view andsuggested that some of the recording of the long period initial of seismic wave was misinterpret…     

西部矿业矿产资源原始数据库研究与系统开发

合理组织和应用多源地学数据,开发适用于矿山企业实现矿产资源管理可视化、网络化、智能化、体系化的数据库系统,对于开展矿山企业生产和科研管理等都具有重大的现实意义。文章较全面地考虑到矿业数据库系统开发的各个方面,以深入细致的研究,探讨矿产资源数据库系统原始数据库的设计及建立方法。     

完善我国现行矿产资源法的理论分析

文章对我国现行矿产资源法立法的历史继承性、时代特征、宪法依据等进行了理论分析,剖析了其立法上的有关局限性,尤其是在综合专家、学者观点的基础上,对矿业权之权利属性进行了一定的归纳分析,为完善我国现行矿产资源法的构想进行了理论上的探讨。     

鄂尔多斯盆地北部铀矿区砂岩型铀矿地浸水文地质条件初步分析评价

本文对鄂尔多斯盆地北部砂岩型铀矿的水文地质条件、含矿含水层的岩性、水文地质结构、水动力条件、水文地球化学特征进行了系统分析和评价,认为地浸水文地质条件良好,可满足地浸采矿要求。针对该地区承压水头小、涌水量偏低的实际情况,结合抽注水连通试验涌水量显著增大的试验结果,提出了加压注水的技术方案,以人工方法提高地下水承压水头,增大涌水量,使之满足地浸采矿要求。     

论空间数据处理与空间数据挖掘

根据现行文献中反复提到的空间数据处理内涵的理解．将空间数据处理分为空间数据处理技术和空间数据处理理论，简要论述了各自的主要内容．讨论了空间数据挖掘的现状和今后研究的重点，比较了空间数据处理与空间数据挖掘的异同。     

Can Damage Mechanics Explain Temporal Scaling Laws in Brittle Fracture and Seismicity?

Time delays associated with processes leading to a failure or stress relaxation in materials and earthquakes are studied in terms of continuum damage mechanics. Damage mechanics is a quasi-empirical approach that describes inelastic irreversible phenomena in the deformation of solids. When a rock sample is loaded, there is generally a time delay before the rock fails. This period is characterized by the occurrence and coalescence of microcracks which radiate acoustic signals of broad amplitudes. These acoustic emission events have been shown to exhibit power-law scaling as they increase in intensity prior to a rupture. In case of seismogenic processes in the Earth's brittle crust, all earthquakes are followed by an aftershock sequence. A universal feature of aftershocks is that their rate decays in time according to the modified Omori's law, a power-law decay. In this paper a model of continuum damage mechanics in which damage (microcracking) starts to develop when the applied stress exceeds a prescribed yield stress (a material parameter) is introduced to explain both laboratory experiments and systematic temporal variations in seismicity.     

Genetic Programming Approach for Predicting Surface Subsidence Induced by Mining

INTRODUCTIONThe study of surface subsidence resulting fromunderground mining holds significance in view ofbeneficial effects on national economy and people’sliving conditions.As is known,a large quantity ofminerals need to be exploited for modernization con-struction.Mining leads to surface subsidence,someunderground engineering and production facilities aredestroyed accordingly,which blocks the developmentof production and retards people’s living standard.To solve this contradiction,su…     

陕北奥陶纪米脂—绥德岩盐田米脂姬家峁矿区O_2m_5~6亚段岩盐资源及开采条件评价

在充分分析米脂—绥德岩盐田地质特征的基础上,对位于其中部的米脂姬家峁矿区O2m65亚段盐矿层赋存特征进行了研究,预测了矿区O2m65亚段岩盐资源储量,并对其开采条件进行了评价。