基于不规则网格的城市地理空间信息共享研究

探讨了城市等级不规则网格的组成及编码规则,分析了城市大比例尺共享空间框架数据的特点、作用及确定原则,以城市有关部门的数据为例进行了城市基础空间信息整合及共享研究。     

曲边冰洲石的发现及其矿床成因的探讨

在各类型冰洲石矿床中发现了大量的冰洲石弯晶，通过冰洲石矿床野外考察的归纳总结，联系到晶体生长和材料力学的有关知识，提出冰州石矿床的成因极可能是原矿床中方解石受到的构造运动强烈影响后，在长期的水淋滤改造作用下发生冰洲石化，并由此而形成冰洲石矿床。     

高温超高压下Ni40Mn30Fe30与叶蜡石反应的研究

本文对Ｎｉ４０Ｍｎ３０Ｆｅ３０合金与在不同焙烧温度下得到的含水叶蜡，在高温超高压下的反应进行了实验研究，温度测至１４２０℃，压是至５．５ＧＰａ，研究了该反应的物质－化学机制，以及反应速率与温度，压力，含水量等参数的关系，对高压下物质迁移运动的固有特征进行了探讨。     

人工合成宝石级翡翠的研究

本文以对化学试剂为原料，用静奇谈怪论同温高压固相转变法合成宝石级翡翠的机理和工艺条件进行了实验研究，测定了与硬玉化学组分相同的玻璃物质的高压熔融曲线和固相转变的区域，提出了在熔融曲线左侧附近固相区生长优质硬玉的观点，以及在宝石级悲翠合成中的若干技术问题。     

Small‐area patch‐merging method accounting for both local constraints and the overall area balance

Small‐area patch merging is a common operation in land use data generalization. However, existing research on small‐area patch merging has mainly focused on local compatibility measures, which often lead to area imbalances among land use types from a global perspective. To address the shortcomings of previous studies by resolving local and global concerns simultaneously, this article proposes a merging method that considers both local constraints and the overall area balance. First, a local optimization model that considers three constraints—namely, the areas of neighboring patches, the lengths of shared arcs, and semantic similarity—is established. The areas of small patches are first pre‐allocated. Subsequently, in accordance with an area change threshold for individual land use types, land use types with area changes that exceed this threshold are identified. The patches corresponding to these land use types are subjected to iterative adjustments while considering the overall area balance. Based on their area splitting abilities, the split lines for small‐area patches are determined, and small‐area patches are merged. Finally, actual data from Guangdong Province are used for validation. The experimental results demonstrate that the proposed method is capable of preserving the local compatibility of patches while balancing the overall area associated with each land use type.     

一种基于Fréchet距离的断裂等高线内插算法

等高线内插是提高地形图精度的一个常用手段,在地图综合等领域中有很重要的作用。在实际地形图数据库中,等高线除了存在完整的计曲线以外,还有一部分断裂的首曲线。已有的等高线内插研究中未考虑对此类数据的处理,为此,本文提出了一种基于Fréchet距离的断裂等高线内插算法。首先提出了等高线度量关系的计算方法,然后对等高线的节点均匀加密,并利用Fréchet距离进行相似度判断以选择参考等高线,最后根据“最近点”的方式进行插值。通过对江苏某地区实际数据的试验,验证了该算法的合理性,对于鞍部地区的内插,有更好的适应性和准确性。     

中国上市公司的时空变化及机制研究

针对在中国地区发展不均衡的态势下,上市公司分布格局时空演变问题,该文对2009-2017年中国大陆各省上市公司的数量和总资产采用Local Moran’s I指数与Getis-Ord Gi*统计量进行研究,分析了中国大陆上市公司的空间分布格局和时间演变趋势,总结出中国上市公司相关指标的高值聚集和高低聚集分布格局、热点区域及其经济辐射能力。并且以北京、上海和广东为热点区域典型代表,从上市公司产业结构和区域经济发展两方面对时空变化机制的成因进行深入探讨。     

A method for the extraction of partition lines from long and narrow patches that account for structural features

The extraction of partition lines for long and narrow patches (LN patches) is an important yet difficult problem in the generalization of thematic data. When current methods are used to process polygons with irregular shapes or complex branch convergence zones, the extracted line structural features tend to be inaccurate and topologically erroneous. In this article, we propose an improved partition lines extraction algorithm of constrained Delaunay triangulation to counter these issues. The proposed method aims to maintain consistency between the extracted line structure characteristics and the actual object structure, especially for complex branch convergence zones. First, we describe three types of aggregation patterns (Type A, B, and C aggregation zones) that occur in partition line extractions for LN patches of complex branch convergence zones using Delaunay triangulation. Then, a partition line extraction algorithm that accounts for the direction between the edges of triangles and the distance of nodes in aggregation zones is proposed. Finally, we test our method for a dataset relating to Guizhou Province, China. Compared with the current method that uses quantitative indicators and visualization, the results indicate that our method not only has applicability for simple situations but also is superior for preserving structural features of complex branch convergence zones.     

基于并行计算的海洋平台谱分析疲劳筛选技术研究

为了得到海洋平台疲劳失效风险最大的焊接区域,提出了以有限元网格单元应力为基础的谱分析筛选方法,并开发了程序。程序采用并行计算架构,单次完成数万个单元的累积损伤度/疲劳寿命计算,并通过有限元软件以云图方式显示疲劳寿命。采用该程序计算双浮筒半潜式平台的疲劳寿命。结果表明,该型平台疲劳失效风险较高的区域为立柱与上壳体下浮体连接对角线转角区域、浮筒中纵舱壁与立柱连接区域。并行计算方法的引入,大大缩减疲劳损伤度计算的分析时间,采用22核心的CPU,时间缩短为原来的1/18.5,17小时完成全平台外壳单元谱分析计算。