多点地震激励下基于改进振型位移法的反应谱方法

基于平稳随机振动理论，运用改进的振型位移法，得到结构多点输入改进的反应谱法，对其中相关系数进行了计算和讨论，对相关系数解析解进行了讨论，得到了解析公式的适用范围。最后通过算例进行了本文方法与MSRS方法计算结果比较，说明本文方法推导是正确的，收敛速度高于MSRS方法。     

利用Poisson积分推导Hotine函数及Hotine公式应用问题

给出一种直接利用改进的Poisson积分确定Hotine函数的推导 ,其中不包括函数的零阶和一阶项。讨论了Hotine公式在陆地和海洋局部重力场逼近中的应用问题。     

西天山阿希型金成矿系列及其成因

西天山吐拉苏断陷盆地中广泛发育有多种类型与火山岩有关的金矿床，根据成矿特征、控矿因素和产出地质环境等可分为3种基本类型，即低硫浅成熟液型金矿、斑岩型金矿和层控浅成热液改造型金矿。该3种类型的金矿是在相同的地质构造背景下和统一的流体场中形成的系列金矿组合－阿希型金矿系列。次一级的流体场和具体的构造环境决定了具体金矿类型的产出；其成矿时间和产出部位均表现出相应的规律性：低硫浅成热液型金矿形成于早石炭世，产出于火山机械的边缘断裂中；斑岩型和层控热液改造型金矿形成于中晚石炭世，分别产出于酸性斑岩体内部及其边缘断裂裂隙系统中和大哈拉军山组第二岩性段中。     

改性粘土矿物在橡胶中的应用

改性矿物取代部分炭黑做橡胶填料的研究是目前国内外材料及化工领域为活跃的科研课题，粘土矿物结构独特，有较高的化学反应活性，具有吸附某些离子并把这些离子保护于交换状态的性能，这些性能特点使粘土矿物经表面改性填充于橡胶成为可能，粘土矿物填料的研究主要包括粘土矿物的结构特点，在橡胶中的作用，典型的粘土矿物寺料的性能特点，尤其是针对不同的橡胶体系和性能要求，选取适当的改性剂及改性处理方法及增大填料的填充量等问题，这方面研究的进展对我国矿产资源的开发利用及橡胶工业的发展有着重要意义。     

A Comparative Quantitative Study of an Omani Soil Using X-Ray Diffraction Technique

Two methods for the quantification of clay minerals using X-ray diffraction techniques: the Constant Mineral Standards Method and the Constant Clay Method were applied to soil samples from Al-Khod (Northern Oman). The first method was based on the addition of different concentrations of clay to constant mineral standards while the latter was based on the additions of known internal standards to the clay sample. The clay investigated in this study contained montmorillonite, palygorskite, illite and kaolinite. The areas of the reflection peaks were found to relate linearly with additions of different proportions of clay or mineral standards. Using the two methods, the concentrations of the different components and their experimental errors were determined. From the errors and self consistency of the results obtained, and the practicality of sample preparation, it is proposed to use the Constant Mineral Standards Method.     

X射线荧光分析中理论α系数经验修正方法研究

在地质样品粉末任片法X射线荧光分析中,使用理论α系数校正基体效应尚有一定的局限性。为了获得最佳校正效果,本文提出了一种简易的理论α系数经验修正方法。     

Effect of Sample Disturbance on Unconfined Compression Strength of Natural Marine Clays

1 .IntroductionCoastalstructuresoftenencountersettlementandstabilityproblemsofsoftmarinefoundation (Liuetal.,1 999;Zhouetal.,2 0 0 0 ;Liuetal.,2 0 0 3) .Manyresearchershaveillustratedthatnaturalmarineclaysaregenerallysubjectedtotheeffectsofsoilstructureduringtheirdepositionalandpost depositionalprocesses (Zhangetal.,1 995;Hongetal.,2 0 0 3a ;2 0 0 3b) .Thesoilstructureofnat uralmarineclaysiseasilydamagedduringsamplingandhandlingbecausenaturalmarineclaysgeneral lyhavehighwatercontentandlowsti…     

群桩沉降计算理论分析

基于Geddes应力解,并根据叠加原理计算群桩内任意点处的三向应力,采用基于Duncen-Chang本构模型的修正分层总和法计算群桩内任意点处的沉降量,最后,根据基点法[1]和群桩基础荷载、变形协调关系建立方程,从而,最终获得群桩的沉降计算。该理论较常规弹性理论方法计算群桩沉降有较大地改进,具体体现在以下几个方面：（1）考虑了群桩中地基土的三向应力分布对群桩沉降计算的影响;（2）考虑了土体本构模型（Duncen-Chang弹性非线性本构模型）,因而,能计及土体非线性特性对群桩沉降的影响;（3）采用修正分层总和法理论,能考虑土体成层分布特性以及侧向变形对单桩沉降计算的影响。     

Formation of magnesium‐smectite during lacustrine carbonates early diagenesis: Study case of the volcanic crater lake Dziani Dzaha (Mayotte – Indian Ocean)

The volcanic crater lake of Dziani Dzaha in Mayotte is studied to constrain the geochemical settings and the diagenetic processes at the origin of Mg‐phyllosilicates associated with carbonate rocks. The Dziani Dzaha is characterized by intense primary productivity, volcanic gases bubbling in three locations and a volcanic catchment of phonolitic/alkaline composition. The lake water has an alkalinity of ca 0·2 mol l^?1 and pH values of ca 9·3. Cores of the lake sediments reaching up to one metre in length were collected and studied by means of carbon–hydrogen–nitrogen elemental analyzer, X‐ray fluorescence spectrometry and X‐ray powder diffraction. In surface sediments, the content of total organic carbon reaches up to 20 weight %. The mineral content consists of aragonite and hydromagnesite with minor amounts of alkaline feldspar and clinopyroxene from the volcanic catchment. Below 30 cm depth, X‐ray diffraction analyses of the <2 μm clay fraction indicate the presence of a saponite‐like mineral, a Mg‐rich smectite. The saponite‐like mineral accumulates at depth to reach up to ca 30 weight %, concurrent with a decrease of the contents of hydromagnesite and organic matter. Thermodynamic considerations and mineral assemblages suggest that the evolution of the sediment composition resulted from early diagenetic reactions. The formation of the saponite‐like mineral instead of Al‐free Mg‐silicates resulted from high aluminum availability, which is favoured in restricted lacustrine environments hosted in alkaline volcanic terrains commonly emplaced during early stages of continental rifting. Supersaturation of the lake water relative to saponite is especially due to high pH values, themselves derived from high primary productivity. This suggests that a genetic link may exist between saponite and the development of organic‐rich carbonate rocks, which may be fuelled by the input of CO₂‐rich volcanic gases. This provides novel insights into the composition and formation of saponite‐rich deposits under a specific geodynamic context such as the Cretaceous South Atlantic carbonate reservoirs.     

Using a Modified Soil-Plant-Atmosphere Scheme （MSPAS） to Simulate the Interaction between Land Surface Processes and Atmospheric Boundary Layer in Semi-Arid Regions

This paper uses a Modified Soil-Plant-Atmosphere Scheme (MSPAS) to study the interaction betweenland surface and atmospheric boundary layer processes. The scheme is composed of two main parts:atmospheric boundary layer processes and land surface processes. Compared with SiB and BATS, which arefamous for their detailed parameterizations of physical variables, this simplified model is more convenientand saves much more computation time. Though simple, the feasibility of the model is well proved inthis paper. The numerical simulation results from MSPAS show good agreement with reality. The schemeis used to obtain reasonable simulations for diurnal variations of heat balance, potential temperature ofboundary layer, and wind field, and spatial distributions of temperature, specific humidity, vertical velocity,turbulence kinetic energy, and turbulence exchange coefficient over desert and oasis. In addition, MSPAS isused to simulate the interaction between desert and oasis at night, and again it obtains reasonable results.This indicates that MSPAS can be used to study the interaction between land surface processes and theatmospheric boundary layer over various underlying surfaces and can be extended for regional climate andnumerical weather prediction study.