内蒙古凉城县草几坝一带土壤化探的数学地质分析

数学地质可用不同的分析方法和图件综合显示多元地球化学数据中的核心信息,对矿床地质特征进行合理的地质解释.凉城草几坝一带1:2.5万土壤化探测量显示出本地区矿化异常是一个以Au为主,伴随有As、Cu、Ag等元素的多元素组合异常.本文应用数学地质分析方法对凉城草几坝一带的南伙房1:2.5万土壤化探数据进行了分析,得出该区异常主要是由一系列北东向构造破碎带所形成的矿化异常.南伙房和坝底地区的土壤化探数据聚类分析表明,8种微量元素可以分为4类,Cu、Ag、Au、As为一类,Pb、Zn为一类,Bi和Sb各为一类.第一类是反映石英脉或蚀变岩型矿化的指示元素组合,第二类反映了中低温的矿化元素组合.南伙房土壤化探元素主因子F1可能代表了石英脉-蚀变岩金矿化.对南伙房440个样品分别计算F1因子得分,得分大于1的有33个,F1因子得分异常等值线图与南伙房工作区Au、As、Cu异常等值线图异常分布情况大致相吻合,因此,Au、As的异常区域及F1因子得分＞1的样品所在的区域重叠处应该是以Au为主的找矿重点区域.     

Implications of defining fisheries closed areas based on predicted habitats in Shetland: A proactive and precautionary approach

During 2010 a set of 22 voluntary closed areas, distributed around Shetland, were proposed by local industry in order to help protect and conserve threatened habitats from potential physical disturbance from scallop dredging. Initially, closed areas were implemented on a precautionary basis over predicted beds of maerl and horse mussel (Modiolus modiolus) derived from historical data. Horse mussel and maerl beds are classed as priority habitats which have been identified as being threatened and requiring conservation under the UK Biodiversity Action Plan (UK BAP). Legalisation of the voluntarily adopted closed areas occurred in 2011. Detailed surveys were conducted to map each closed area with specific reference to the defining features located within. Closed areas were surveyed using a hull mounted multibeam system and ground-truthed with an underwater camera system. Information was imported to a Geographic Information System (GIS) in order to create georeferenced habitat maps of the two species of interest. The appropriateness of each closed area was assessed and a proposed methodology and procedure outlined for any future closed areas. The primary aim was to provide information on which to test the validity of initial closed area boundaries and subsequently allow managers to refine and add to them in the future. The survey illustrated the need to have good quality acoustic and visual survey work undertaken whenever areas have been closed based on historical data and/or predicted habitats. Predicted beds were not found to be representative of the survey findings. The survey highlighted the lack of good quality, robust, accurate, and up to date species information for the waters around Shetland, especially with regard to priority marine features. Although some were neither fully protecting the UK BAP habitats they were designed to protect nor were protecting any UK BAP habitats, a degree of protection had been conferred to some priority features in the first iteration of implementation of closed areas. Survey data were subsequently used to legally alter the closed area boundaries to more appropriately reflect the distribution of priority features. Recommendations were made on appropriate procedures for defining a species bed and on the wider implications of the study’s findings for other fisheries areas developing spatial management plans.     

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。     

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…     

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.     

上海市地下水可开采量模型计算及预测

本文利用非稳定准三维水流－－一维沉降耦合数学模型,采用有限元数值解,以上海行政区为计算区域,对１９８１－１９９２年地下水采灌量、水位及土层变形量等实测资料进行数值模拟,利用１９９３－１９９８年实测资料对模型进行检验,表明所确定的数学模型是合理可信的,利用该模型计算了地下水可开采量及地下水流场和地面沉降的预报。     

基于核基因组标记的群体遗传学研究中的数学分析方法

近些年来,各种数学分析方法被广泛的应用于群体遗传学的研究中。然而,对这些数学分析方法的应用缺乏统一的认识,某些研究甚至存在着误用、乱用等现象。对近些年来基于核基因组标记的群体遗传学研究中主要采用的数学分析方法进行了系统的归纳整理,明晰了它们的适用条件和范围。同时,也综述了显性分子标记中对隐性等位基因频率估算的研究进展以及常用的群体遗传学分析软件包含的主要数学分析方法,对合理应用这些参数和软件进行群体遗传学分析具有指导意义。     

A STUDY ON THE CARTOGRAPHIC FUZZY MATRIX MODEL AND MATHEMATICAL EXPRESSIONS OF CARTOGRAPHIC TERMS

On the basis of the research of the cartographic modelsmade by the authors some years ago,this paper further studies theestablishment of cartographic fuzzy matrix to make the concepts incartography e.g.,selection,deletion,mapping generalization andimage tranformation,into some precise mathematical expressions.     

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.