数理统计在油气层解释中的应用

数理统计原理是应实践的需要而发展起来的，并成为实际工作中的一种基本工具，特别是在地质工作中应用越来越广泛，但由于它的统计计算相当复杂，一直未能得到有效地利用，为了更好地将数理统计方法和地质理论结合起来，充分发挥计算机这一现代化设备的作用，使数理统计原理在油气层解释中见到很高的效益，更好地为地质录井服务，我们研制了数理统计软件包，本文主要介绍该统计中判别分析方法在油气层解释中的应用。     

建筑基础沉降与岩层倾角关系的监测与分析

以大量的工程监测数据为依据，对基础沉降与岩层倾角的关系进行了系统的数学分析，得出了基础沉降与岩层倾角关系的数学模型。     

The permanence of stream networks in Britain: Further comments

Previous surveys of the stream network in an area of blanket peat moorland in the Southern Pennines, England, are reassessed with reference to the publication of a new ordnance survey 1:10000 Metric Edition map for the area. It is concluded that a significant number of low order streams are still omitted on the new map, and that the use of field surveys remains essential in such heavily dissected terrain.     

On models for landscape connectivity: a case study of the new-born wetland of the Yellow River Delta

The models for landscape connectivity are distinguished into models for line connectivity, vertex connectivity, network connectivity and patch connectivity separately. Because the models for line connectivity, for vertex connectivity, and for network connectivity have long been studied and have become ripe, the model for patch connectivity is paid special attention in this paper. The patch connectivity is defined as the average movement efficiency (minimizing movement distance) of animal migrants or plant propagules in patches of a region under consideration. According to this definition, a model for landscape connectivity is mathematically deduced to apply to GIS data. The application of model for patch connectivity in the new-born wetland of the Yellow River Delta shows patch connectivity has a negative interrelation with human impact intensity and landscape diversity.     

Flow structure of turbidity currents

A two‐dimensional numerical model is used to describe the flow structure of turbidity currents in a vertical plane. To test the accuracy of the model, it is applied to historical flows in Bute Inlet and the Grand Banks flow. The two‐dimensional spatial and temporal distributions of velocity and sediment concentration and non‐dimensionalized vertical profiles of velocity, turbulent kinetic energy and sediment concentration are discussed for several simple computational currents. The flows show a clear interaction between velocity, turbulence and sediment distribution. The results of the numerical tests show that flows with fine‐grained sediment have low vertical and high horizontal gradients of velocity and sediment concentration, show little increase in flow thickness and decelerate slowly. Steadiness and uniformity in these flows are comparable for velocity and concentration. In contrast, flows with coarse‐grained sediment have high vertical and low horizontal velocity gradients and high horizontal concentration gradients. These flows grow considerably in thickness and decelerate rapidly. Steadiness and uniformity in flows with coarse‐grained sediment are different for velocity and concentration. The results show the influence of spatial and temporal flow structure on flow duration and sediment transport.     

Introduction to pareto optimal mine planning

Summary Recent advances in mathematical optimization have resulted in the development of superior techniques for solving realistic decision making problems. The technique called PARETO OPTIMAL SERIAL DYNAMIC PROGRAMMING is presented here as a tool for rational mine planning. This approach always enables the identification of a set of decision alternatives considered superior to the remaining feasible, usually numerous, decision alternatives, when a number of conflicting, noncommensurable, objectives are simultaneously optimized. It is further noted that the decision makers' truly preferred decision is always one of the members identified as the superior set.Notation [A] Number of initial decision alternatives for production stage 1 - [A ] Accumulated pareto optimal stage objective vector at stage for the remainder of the stagesN – - [A] Accumulated non-pareto optimal stage objective vector at stage for the remainder of the stagesN – - [B] Number of initial decision alternatives for production stage 2 - [C] Number of initial decision alternatives for production stageN - [COG _k,] Cutoff grade for decision,k, at production stage, - [D] Number of initial pareto solutions for production stage 1 - [D ] Decision at stage - [E] Number of initial pareto solutions for production stage 2 - [F] Number of initial pareto solutions for production stageN - [j] A random objective function - [J] Number of objective functions - [LIFE _k,] Minelife for decision,k, at production stage, - [] An arbitrary production stage - [N] Final production stage - [NPV] Expected net present value - [NPV _k,] Project net present value for decision,k, at production stage - [OPR _k,] Ore production rate for decision,k, at production stage, - [S ] State of the system in stage - [ _n] Immediate state objective vector at stage      

基于GIS的矿产资源评价信息系统分析与设计

在MapGIS的基础上对矿产资源评价系统进行系统需求研究,总结出矿产资源评价信息系统的总体结构,给出了矿产资源评价中经常用来解决资源量的定位问题的数学模型——矿床定位预测特征分析模型,并对矿产资源评价系统进行了结构设计。     

钻孔灌注桩端后注浆技术的工程实践

杭州城东某区块高层建筑原设计以强风化泥质岩作为钻孔桩端持力层,桩长为62—65m。在分析了场地工程地质条件的基础上,认为该设计不利于钻进与混凝土灌注,桩基础成本高,提出了采用钻孔桩端后注浆技术,选择园砾层作为桩端持力层,有效桩长设计为40m。详细介绍了钻孔灌注桩的设计参数、加固机理、工艺流程和施工工艺,总结出注浆技术的实践经验。通过验证砂砾石地层桩端后灌注桩承载力及最大沉降量均达到设计要求．为本地区同类工程的桩基础设计与施工积累了经验。     

Modeling and Simulating for TSHD’s Swell Compensator by ADAMS

1 Introduction Today, maneuvering the draghead of a trailing suction hopper dredger (TSHD) on a predetermined spot is an operation that demands an increasing degree of accuracy (Cornelis, 1983). As a self-propelled, self-loading and self-discharging seagoing or inland waterway vessel with one or more flexible suction pipes equipped with special dragheads, the TSHD has a wide application area and is therefore called the workhorse of the dredging industry (Ni, 2004). The swell compensator, c…     

考虑多大气参数不确定性的地面太阳短波辐射估算误差数学期望

以香港地面站观测的AOD与WVC数据为参照,首先分析了MISR/AOD和MODIS/WVC产品的不确定性描述方法,然后在考虑二者联合不确定性的影响下,推导了辐射传输方程法估算地面太阳短波辐射的相对误差分布函数。通过统计2005―2013年香港MISR/AOD和MODIS/WVC反演值的分布情况,得出两者的联合概率密度函数,然后将AOD和WVC的联合概率密度函数作为权重函数与相对误差分布函数积分,得到对辐射传输方程法估算地面太阳短波辐射的相对误差数学期望。结果表明,夏季在太阳天顶角为0°时,使用MISR/AOD和MODIS/WVC产品估算地面太阳短波辐射的相对误差期望为3.17%,并且有90%的把握使估算结果相对误差＜3.53%;不同季节不同太阳天顶角下、不同置信水平下,地面太阳短波辐射估算的相对误差大小,可为不同应用研究提供基础数据,为评估亚热带地面太阳短波辐射估算结果是否符合应用需求提供依据。