基于网格计算的数字城市空间信息平台框架

数字城市空间信息平台可为国民经济发展、国防建设、人口、资源、环境和灾害等重大社会持续发展问题提供全面的信息共享服务。传统数字城市空间信息平台的封闭性和自身服务器的性能限制了进一步的应用。网格技术能够实现数据访问透明、一体化应用服务、计算吞吐量极大。本文提出了一套基于网格计算的数字城市空间信息平台框架,并对数据网格中的单个计算节点作了基于J2EE三层体系结构的实现。     

基于空间数据库的城市网格化管理与服务系统的设计与实现

从城市GIS如何满足网格计算环境下城市管理与服务的现实需求出发,探讨了建立城市网格化管理与服务系统所需要的条件,设计了基于空间数据库的城市网格化管理与服务系统基本框架和工作流程,并以武汉市江汉区城市网格化建设为例,验证了该系统的运行效果.     

基于二十面体剖分格网的球面实体表达与Voronoi图生成

在分析当前球面空间数据结构的基础上，讨论了利用Snyder等积投影在二十面体上建立球面空间基础剖分方式的思路，然后在初始投影面上采用六边形格网进行层次细分，获得多分辨率的全球铺盖。提出了基于六边形格网的三叶节点管理与瓦片编码的基本思路，确立了球面不同实体的六边形格网表达模式。在此基础上，提出了基于球面六边形铺盖的Voronoi图生成算法，实验验证了算法的正确性与效率。     

国家地质空间信息网格结点计算池构架及其实现

本文针对网格虚拟和协同的核心技术问题,对组成国家地质空间信息网格平台的网格结点计算池的构架与机制、组成网格结点计算池的资源聚合器、元服务、智能服务引擎的概念及网格结点计算池的服务流程进行了讨论。该构架通过资源聚合器实现提供统一方式服务发现的接口、为资源虚拟化及空间数据的描述发现和集成提供支持;通过网格元服务技术,集合一组通过广域网连接起来的性质不同的服务(计算)资源,并作为一个单独的计算环境向用户提供计算服务的元服务;通过网格服务智能服务引擎,进行服务发现、异步通讯及元服务级的并行计算、均衡负载、生命周期管理、服务与资源绑定以及把门户中的用户管理、资源监控、网络安全、计费等功能组合和融合,实现了一个无状态服务和一个或多个有状态资源的关联的协同。目前已初步构建了国家地质空间信息网格,连通13个结点,并开始实际业务模式运行。实现了长江中下游有色金属成矿带和西南三江有色金属成矿带的在线分布式资源评价和华北平原地下水资源动态评价,取得了很好的实际运行效果。     

气象要素场等值线图自动绘制

根据业务的特殊性研制的气象要素等值线图绘制软件,通过把离散站点自动连接成符合Delaunay特性的不规则三角形网格,自动生成的等值线符合人们手工绘制等值线规则,可以绘制气象要素和北太平洋海温等值线分布图,绘制海陆边界并填充颜色。通过自定义的坐标系,很好地解决了屏幕坐标与实际坐标之间的转换、地图投影的实现等问题。程序具有丰富的绘图功能,可以根据需要手工绘制各种矢量图形对象和插入图像对象,能修改对象属性,包括随意移动位置、改变大小等,可以设置各种对象的显示顺序,能设置对象为Alpha混合透明显示。图形对象实现矢量级别的无级缩放,实现精细打印功能,满足日益发展的业务需求。     

Metamorphic and structural evolution of the Early Proterozoic Puolankajärvi Formation, Finland – II. The pressure–temperature–deformation–composition path

The paragenetic relationships between sillimanite, andalusite, kyanite, chlorite, cordierite, biotite, garnet and staurolite in the Early Proterozoic Puolankajärvi Formation (PjF), together with mineral compositions, are used to construct a partial petrogenetic grid for metapelites with significant Mn content (MnO = 0.1–0.5%) by adding a six-phase invariant point over the garnet-absent invariant point for Mn-free AMF-phases.
The grid and textural relations of the PjF are used to construct part of the P–T –deformation path for the PjF. Relatively short deformation pulses and associated flow of oxidizing fluid along shear zones were responsible for the paragenetic and compositional changes during cooling and decompression at 600–500°C and 6.0–2.5 kbar. Oxidation led to decreased Fe²⁺ and further stressed the importance of Mn (increased Mn/divalent cations).
A tectonothermal evolution of the Kainuu Schist Belt is presented which includes crustal thinning and steepening of a previously established thermal gradient. This was followed by thrusting and folding of the isotherms into a thermal antiform on the western side of the belt.     

Computational properties of a new horizontal staggered grid

On variable configuration in the horizontal direction, Winninghoff[1] had some discussions in the 1960s. Subsequently, according to the thoughts of Winning- hoff, Liu Yudi[2―9] has widely and deeply studied al- most all the existing horizontal grids from the fre- quency and group velocity of inertia gravity and Rossby waves. Results show that although Arakawa C grid is the best one among all existing horizontal grids, it also has some shortcomings. For example, there is still an “average…     

Reaction history of garnet-sapphirine granulites and conditions of Archaean high-pressure granulite-facies metamorphism in the Central Limpopo Mobile Belt, Zimbabwe

ABSTRACT Sequential reaction textures in Archaean garnet-corundum-sapphirine granulites from the Central Zone of the Limpopo Belt document a progression from early, coarse-grained, high-pressure (P > 9.5 kbar) granulite-facies assemblages (M1) to late, low-pressure (P <6 kbar) granulite-facies sub-assemblages (M2). The stable M1 assemblage was garnet (57% pyrope; Mg/(Mg + Fe) = 62) + sapphirine + corundum + gedrite + phlogopite + rutile. Late-M1 boron-free kornerupine grew at the expense of garnet and corundum, and coexisted with garnet, sapphirine and gedrite. Partial or complete breakdown of coarse garnet and kornerupine during M2 resulted in the development of pseudomorphs and coronas consisting of fine-grained symplectic intergrowths of cordierite, gedrite and sapphirine (later, spinel). The majority of reaction textures can be explained in terms of a stable reaction sequence, and a model time-sequence of mineral facies can be constructed. When compared with a qualitative petrogenetic grid of (Fe, Mg)-discontinuous reactions in the FMASH multisystem sapphirine-garnet-corundum-spinel-cordierite-gedrite-kornerupine, the facies-sequence indicates decompression at essentially constant T assuming constant a(H₂O). Exhumation of M1 corundum inclusions during M2 breakdown of kornerupine resulted in production of metastable spinel by a disequilibrium reaction with gedrite. A second disequilibrium reaction of the spinel with cordierite produced sapphirine. The operation of such reaction while pressure was decreasing (the opposite dP from that implied by the texture if assumed to be the product of an equilibrium reaction) has serious implications for the use of reaction textures in the construction of P-T vectors. Garnet-biotite thermometry on garnet interiors and phlogopite inclusions in corundum yields temperatures of ca. 850°C for the M1 stage. A minimum late-M1 pressure of ca. 7 kbar is indicated by the former association of kornerupine and corundum. Relict M1 kyanites reported by other workers indicate a minumum early-M1 pressure of 9.5 kbar, implying metamorphism at depths of at least 33 km (probably 38km). The high-pressure granulite-facies metamorphism was followed by an almost isothermal pressure decrease of > 5 kbar, indicative of rapid uplift. The P-T path is interpreted as the product of a single metamorphic cycle which probably took place in response to tectonic thickening of the crust. Such a process contrasts with the extensional origin recently proposed for isobarically cooled granulite-facies terranes.     

论矿床经济合理的勘探网度

本文针对以往确定矿床合理勘探网度的方法所存在的缺陷,提出了矿床总利润和矿床最低总利润两个新的度量指标,提出了矿床经济合理勘探网度的概念及决策原则,且对××铁矿的经济合理勘探网度进行了实际研究。     

基于栅格GIS滑坡风险评价方法中格网大小选取分析

以地理信息系统（GIS）作为工具和研究手段的滑坡风险评价方法已得到了普遍的认可和使用，较为成熟的方法是基于栅格GIS的滑坡风险评价方法，即将滑坡风险评价中考虑的各种因子归一化处理后转换成相同空间分辩率的定量数据，然后根据特定模型进行数据运算，最后得到风险评价结果图。但在风险评价过程中存在这样的问题：对于已经量化的各影响因子，采用什么样的空间分辩率来栅格化这些因子数据才比较合适。该文以基于地形的香港大屿山滑坡风险评价为例，分析了影响空间分辩率选择的因子，并给出了影响因子空间分辩率确定的经验公式。