软土地区小桥涵桥台路基沉降拟合处理方法

软土地区桥台与桥涵之间产生较大的差异沉降, 影响使用.提出采用沉降拟合方法, 即根据复合地基的设计思想, 通过在桥台与桥涵部位采用不同置换率, 调整沉降量, 使其相近, 以达到减少沉降差的目的.      

从成矿构造动力学探讨脉状金矿床成矿深度

在综述国内外与韧性剪切带有关的脉状金矿床成矿动力学的新近研究成果后,根据成矿控矿构造动力学特征及其与成矿流体运移机制、矿物结晶特点的关系认为矿物结晶发生于地震微破裂导致成矿流体压力骤降后的低压力阶段,由矿物包裹体压力并按静岩压力梯度推算的成矿深度要明显小于矿床的实际成矿深度.本文提出一种新的成矿深度估算方法,其估算的成矿深度与目前大多数脉状金矿床中石英具有明显的韧性变形的特点相吻合.     

大别造山带钾氩年龄的解释—差异上升的地块

根据冷却年龄理论和大别造山带变质岩K-Ar表面年龄的平面分布,指出这些年龄既不代表岩石形成事件,也不简单地反映后期热事件,而代表岩石经剥蚀隆起温度下降到该矿物封度温度以来的时间,即反映地区的构造隆起历史。现有资料说明大别造山带整体在印支期开始隆起,但中部罗田—英山一带则隆起较快或地热增温率高,因而表现出年轻(燕山期)的表面年龄。     

高松矿田芦塘坝矿段矿床控矿特征新认识——构造溶蚀控矿

通过对芦塘坝矿段锡多金属矿床地质特征的深入研究及实际资料的剖析,提出该矿床是由燕山晚期侵入于深部的花岗岩浆分异形成的岩浆期后含矿热液,经导矿断裂上升后,充填于构造溶蚀空间而形成。      

Geochemistry of dissolved and particulate elements in the major rivers of China (The Huanghe,Changjiang, and Zhunjiang rivers)

The relationship between the geochemistry of dissolved and particulate materials and geographic conditions was investigated. Samples of water and suspended particulate matter were collected from five locations in three of the major rivers of China (the Huanghe, Changjiang, and Zhunjiang rivers). Because these rivers generally flow parallel to latitudes and flow through diverse geologic and climate zones, they provide excellent opportunities for comparisons of solute transport. The geochemistry of these rivers is influenced strongly by climate. The low discharge of the Huanghe River influences the character of the major ionic materials (Cl^?+SO₄ ^2? and Na⁺+K⁺) as well as the high degree of mineralization within the system. Dissolved concentrations of both major ions and trace elements are lower in the southern reaches of the rivers. The highly mobile ions, such as, Na⁺ and Ca²⁺, are depleted from the suspended particulate material in the southern regions, while the relatively immobile ions of Al, Fe, Ti, Mn, and trace metals are concentrated within the suspended mateiral. The relative mobility of some elements as measured by the Dissolved Transport Index (DTI) changes with climate. The geology of the area drained by the rivers has a major influence on the geochemistry in areas of similar climate. Lowest leaching rates in the southern climates occur in areas dominated by granite, which is resistant to weathering. The composition of both cations and anions among the three tributaries of the Zhujiang River are dependent on the rocks that dominate each eregion. Some particulate forms of the rare earth elements are present in the highest concentrations in regions dominated by granite. The DTI calculated for the major rivers in China are much smaller than those computed for other major rivers of the world. The low concentration of heavy metals in the particulate material suggests that pollution in the rivers of China is less serious than in rivers of other industrialized countries.     

华南叠加-重熔型花岗岩的成生机制

南岭成矿带是太平洋及印度洋板块对中国大陆板块联合作用的结果。囊括大量稀有-有色金属矿床的中心弧形构造-岩浆岩系正是这个“钳式”应力场作用的集中体现,“深部叠加-重熔”——以板块持续运动和相对高速率运动产生并贮集能量为前提,以俯冲板块不断带入新的挥发物质为条件,随着动力热和挥发组分的不断回流—汇集—贮集而使仰冲板块深部预热的原地或途中固化-半固化的先期熔融的岩浆岩发生了二次甚至多次的熔融作用。     

TRP与Logit概率预报模式计算比较分析

本文分别利用TRP模式及Logit模式与MOS相结合的方法,对南京市的能见度及云量进行了24小时概率预报试验。通过对两种模式的比较分析,结果表明：Logit模式的拟合率比TRP模式的高,而在实际预报中,TRP模式的预报准确率高。同时,TRP模式的计算更为方便灵活。     

垂直风切变对热带气旋强度及结构的影响

利用一个非静力、原始方程热带气旋模式(TCM4),通过对f平面不同强度的垂直风切变下理想热带气旋的模拟后发现:29.15°C的海温下理想热带气旋最大可能强度(MPI)接近910hPa,近中心最大风力可达到76 m·s-1左右。在理想条件下,能抑制热带气旋强度甚至减弱的垂直风切变临界值在8～10m·s-1。由于切变造成涡度平流随高度变化,使得在顺切变前部以及左侧边界层附近产生辐合,伴随着空气的气旋式螺旋上升,外流层对应区域产生辐散,从而使得强对流和强降水发生在顺切变左侧。     

广东冬季水资源的预测和因子背景场分析

为预报广东冬季水资源量,利用500hPa高度场和太平洋海温场作为气候变化的相关因子场,并应用了主分量逐步回归预测模型进行了计算。利用各标准化主分量的预测结果,按照主分量逐步回归模型进行回算得到预测场。结果表明,2004年和2006年预测结果与实况比较相似;2005年冬季水资源预测值和实测值分布相差较大。为了分析预测因子的影响,对进入广东冬季水资源场前4个主分量预测方程的因子进行分析,并对个别关键因子的背景场做了细致的研究。