An approximate method for evaluating the shear band thickness in saturated soils

A formula for the thickness of a shear band formed in saturated soils under a simple shear or a combined stress state has been proposed. It is shown that the shear band thickness is dependent on the pore pressure properties of the material and the dilatancy rate, but is independent of the details of the combined stress state. This is in accordance with some separate experimental observations. Copyright © 2004 John Wiley & Sons, Ltd.     

A numerical method for differential equations of second order

A new algorithm of order five is presented for the solution of the initial value problem where the system of ordinary differential equations is of second order and does not contain the first derivative.     

微波作用下化学助剂在细粉煤脱水中的应用研究

探讨了在微波加热条件下加入表面活性剂和溶剂油等有机溶剂对脱水效果的影响，力求找出其中的脱水规律。结果表明：微波脱水效果明显，同时，表面活性剂能够大大降低滤饼含湿量，而且非离子表面活性剂的效果比阳离子、阴离子好，柴油也能促进粉煤的脱水。     

TRMM卫星微波成像仪分级产品及其反演降水算法

文章叙述了获取定量降水信息的意义，简要介绍了对热带测雨卫星TRMM(Tropical Rainfall Measurement Mission)的仪器、美国国家宇航局提供的微波成像仪TMI(TRMM Microwave Imager)分级产品。对比了物理方法和经验方法反演降水的特点，并对一些经验方法以及倾斜对流系统对反演降水的影响、动态聚类分析、神经网络反演方法的研究成果进行了介绍。     

建筑物沉降规律的综合时序分析

建筑物的沉降监测数据序列具有趋势变化和随机变化的特点，本文针对两种变化项的特点分别建立相应的数学模型，再将其组合起来建立综合数学模型，从总体上把握沉降数据序列的变化规律。实例计算分析表明，此方法具有较高的拟合精度和预测能力，具有一定的应用参考价值。     

REE and (э)Nd of clay fractions in sediments from the eastern Pacific Ocean: Evidence for clay sources

Clay fractions in the non-calcareous surface sediments from the eastern Pacific were analyzed for clay minerals, REE and 143Nd/144Nd. Montmorillonite/illite ratio (M/I ratio), total REE contents ((REE), LREE/HREE ratio and cerium anomaly (бCe) may effectively indicate the genesis of clay minerals. Clay fractions with M/I ratio >1, бCe (0.85, (REE (400 μg/g, LREE/HREE ratio (4, and REE patterns similar to those of pelagic sediments are terrigenous and autogenetic mixed clay fractions and contain more autogenetic montmorillonite. Clay fractions with M/I ratio <1, бCe=0.86 to 1.5, ΣREE=200 to 350 μg/g, LREE/HREE ratio (6 and REE distribution patterns similar to that of China loess are identified as terrigenous clay fraction. The 143Nd/144Nd ratios or (э)Nd values of clay fractions inherit the features of terrigenous sources of clay minerals. Clay fractions are divided into 4 types according to (э)Nd values. Terrigenous clay minerals of type I with the (э)Nd values of -8 to -6 originate mainly from North American fluvial deposits. Those of type II with the (э)Nd values of -9 to -7 are mainly from the East Asia and North American fluvial deposits. Those of type III with (э)Nd values of -6 to -3 could come from the central and eastern Pacific volcanic islands. Those of type IV with (э)Nd values of -13 to -12 may be from East Asia eolian. The terrigenous and autogenetic mixed clay fractions show patchy distributions, indicating that there are volcanic or hot-spot activities in the eastern Pacific plate, while the terrigenous clay fractions cover a large part of the study area, proving that the terrigenous clay minerals are dominant in the eastern Pacific.     

云南东北部拱王山末次冰期

1 Introduction The Gongwang mountains constitute one of the few high m ountains of irrefutable late Pleistocene glaciation in eastern China. This area is one of the m ost extensively studied Quaternary geologicallocationsin eastern China and the interpret…     

Sedimentary macro-structures and forming mechanism of debris flow

IIWr~IOWThesedimentarycharacteristicsofdebrisflowcanreflectthecompoSition,fluidtypeandsedimentaryprocess.ThescholarswhostudymoderndebrisfloWinChinagenerallyclassifydebrisflowbythemethodofviscositywithfloWpattern.SeveraltypicalschemesareshowninTable1,inwhichthemethodofunitweight(fluiddensityinunitvolumet/m3)isusedandfluidunitweightisthoughttobethedirectproPOSitiontotheviscosityofdebrisflow(Wu,1990).Ithasbeenprovedbyhydrcrmechacsthatnon-cohesivedebrisf1OwfollowsBagnoldgranular'flowmedel(B…     

天山地区遥感解译及铀矿化地质特征

本文通过卫星照片解译对天山地区的地层进行了划分,尤其是通过线性构造的解译把天山地区分成了若干个不同性质的地块,并对构造规模进行了分级。此外,还讨论了新老构造的继承关系,构造与岩体之间的相互依存关系等。本文又通过环形体的解译进一步确定了火山岩的喷发期次、活动规模及其与铀矿化的关系。通过对花岗岩体侵入期次和相带的划分,进而在解译中配合四道能谱测量判读标志来分析不同影象地质体的可能含铀丰度。另外还探讨了褶皱构造各要素的半定最估算的可能性。     

南秦岭东江口、柞水岩体岩石谱系单位划分及演化

南秦岭东江口、柞水岩体位于南丹断裂带南侧,为华力西期岩基。通过1：5万地质填图,将东江口老体划分为5个岩石谱系单位,柞水岩体划分为3个岩石话系单位,共圈定出36个侵入体。分别建立了东江口超单元和排水超单元。依据接触关系,结构构造,包体特征确定了其侵入序次,构成了两个完整的“S”型岩浆演化序列,在岩石矿物组成、岩石化学成分、微量元素及稀土元素组成上,各具有明显的独特岩浆演化特征,分别形成于南秦岭晚古生代被动陆线构造环境。