非线性多自由度结构地震反应的共振特性与突变分析

由渐近解法，在主坐标中给出了非线性多自由度结构地震反应的渐近解，利用渐近解计算了共振区振幅-频率响应的一系列数值结果，进而分析了系统参数对共振区反应特性的影响及突变性质。地震反应中表现出来的突变性、共振畸变、“路径”效应等复杂的非线性特性，对结构系统的动力特性有重要影响。     

水平电偶极子在三层媒质中激发的电磁场特征的数值研究

将空气及地面以下两层视为三层有耗散的线性媒质，求出第三层中的水平偶极子激发的电磁场在地表处的积分形式解，进行数值计算，分析其频谱特征。结果表明电磁辐射异常的优势频率为0～2Hz，与实际观测资料相吻合，在超低频或甚低频，有比较明显的电磁场异常。并讨论其对地震电磁辐射监测的指导意义。     

2003年5月22日阿尔及利亚6.9级地震概述

2003年5月22日阿尔及利亚发生6．9级地震，造成生命和财产的严重损失。这是阿尔及利亚近20年来遭遇最强烈的一次地震袭击。文章对该震的基本参数、震源机制、破坏伤亡、救援和发震背景等作了概述。     

动力变形条件下Au迁移、富集的构造地球化学实验研究

对海南二甲金矿和广东河台金矿形成的动力学条件进行了一系列的构造地球化学模拟实验。结果表明，动力变形中发生了明显的力学—化学耦合作用。云母矿物变形强烈，塑性变形，定向拉长显著。黑云母发生了褪色作用，从褐色变成浅褐色甚至无色；白云母干涉色从鲜艳的蓝色变为黄色，甚至无色。随试验温度、压力条件的升高，岩石、矿物从脆性变形向塑性变形演变。动力变形还使岩石和矿物中的元素呈现化学迁移和富集作用：云母矿物中的杂质容量降低，导致铁质释放；硫化物矿物的反射率增高，成矿元素特别是Au在其不同部位发生一定的变化。自然金颗粒在析出过程中，与Si、Fe分离而纯化。动力变形中成矿元素(特别是Au)的迁移、富集等效应是通过压溶作用实现。     

Analysis of the Major Fe Bearing Mineral Phases in Recent Lake Sediments by EXAFS Spectroscopy

Extended X-ray absorption fine structure (EXAFS) spectroscopy and chemical analyses were combined to determine the Fe bearing minerals in recent lake sediments from Baldeggersee (Switzerland). The upper section of a laminated sediment core, deposited under eutrophic conditions, was compared to the lower part from an oligotrophic period. Qualitative analysis of FeK EXAFS agreed well with chemical data: In the oligotrophic section Fe(II)–O and Fe(III)–O specieswere present, whereas a significant fraction of Fe(II)–S sulfides was strongly indicated in the eutrophic part. A statistical analysis was performed by least square fitting of normalized reference spectra. The set of reference minerals included Fe(III) oxides and Fe(II) sulfides, carbonates and phosphates. In the oligotrophic regime no satisfying fit was obtained using the set of reference spectra, indicating that siderite (FeCO₃) was not present in a significant amount in these carbonate-rich sediments. Simulated EXAFS spectra for a(Ca_x, Fe_1-x)CO₃solid solution allowed reconstructing the specificfeatures of the experimental spectra, suggesting that this phase was the dominant Fe carrier in the oligotrophic section of the core. In the eutrophic part, mackinawite was positively identified and represented the dominant Fe(II) sulfide phase. This finding agreed with chemical extraction, which indicated that18–40 mol% of Fe was contained in the acid volatile iron sulfide fraction. EXAFS spectra of the eutrophic section were best fitted by considering the admixture of mackinawite and the Fe–Ca carbonate phase inferred to be predominant in the oligotrophic regime.     

Geodetic control on recent tectonic movements in the central Mediterranean area

During the Neogene and Quaternary, the western Mediterranean geodynamics was apparently dominated by the nearly eastward migration of the Apenninic arc and the associated opening (spreading) of the back-arc basin (Tyrrhenian Sea). However, during the last 5 My, the collision of the arc with the Apulian platform led to a dramatic change in the tectonic setting of the area. As geological processes require a long period of time to register the displacements of the different blocks, it is indispensable to take into account the present-day motion given by space geodesy data analysis in order to better constrain the geological models.Geodetic motions were derived from Global Positioning System (GPS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI) observations collected from different networks. All the geodetic solutions have been computed and combined at the Centre of Space Geodesy (CGS), at Matera, Italy.The geodetic results show a NNE motion of the Adriatic plate with a small component of counter-clockwise rotation, in good agreement with the geological and geophysical observations.In the southern Tyrrhenian area, the lengthening of the Matera–Cagliari baseline should imply that convergence cannot be considered as the driving mechanism for the Apenninic subduction process. The estimated motion of Noto is in quite good agreement with the estimated motion of the African plate.     

电子商务的优势及其在地矿领域的发展对策

通阐明了电子商务的起源、特征和优势，以及我国电子商务现状及发展中存在的主要问题，提出了解决这些问题的主要对策，并对地质矿产领域电子商务提出了发展对策。     

济阳坳陷油田卤水溶解金属元素的初步实验研究

本文用模拟实验方法研究了不同水型的油田卤水在低温（40－150℃）条件下对金、银等金属元素的溶解和迁移作用，以及不同络阴离了对金属元素溶解迁移的贡献。结果表明，油田卤水促进了含油气盆地中Au、Ag、Pb、Zn元素的淋滤、溶解和迁移，起到了成矿流体的作用，从而积极参与了沉积改造矿床的成矿作用。CaCl2型油田卤水易溶解Pb、Zn，而NaHCO3型油田卤水溶解Au、Ag的能力较强。在油田卤水中HS^-及SO4^2-离子对Au、Ag元素的络合能力强，而乙酸根离子及HS^-(或S^2-）易络合Pb、Zn元素。     

斜方顽火辉石-正铁辉石固溶体出溶机制的研究

通过组成－自由能关系曲线的分析，提出斜方顽火辉石－正铁辉石（MgSiO3-FeSiO3)固溶体出溶的临界温度约为753K；组成XFe为0.82左右的富铁辉石固溶体处于介稳态，出溶作用有利于系统自由能降低；出溶作用是以Fe^2 、Mg^2 离子逆扩散的方式进行的；出溶作用的推动力是上凸区域介稳相与平衡相之间的化学位差。