中国集贸市场的历史发展与地理分布

文章概述了不同历史时期中国集贸市场发展的特点及其地域分布差异,指出合理规划布局和加强市场管理是培育和发展我国集贸市场的两个着力点。     

2006年胶州湾现有水域面积与岸线的卫星调查与历史演变分析

利用2006年5月20日Landsat-5 TM卫星数据对胶州湾的现存水域面积与岸线长度进行了量算,结果给出胶州湾2006年现存总水域面积为353．92km^2,总岸线长度为220．02km.与历史数据进行比较发现,总岸线长度在进一步加长,而总水域面积在进一步缩小。其原因是由胶州湾的人工围垦所致。     

近2000a中国重大历史事件与气候变化的关系

论述了2000年来中国历史时期重大事件与气候变化的关系。气候温暖时期,降雨丰沛,中国北方游牧民族北撤,与中原王朝和平共处,多为太平盛世时期;气候寒冷时期,气候干燥,北方游牧民族南迁,农民暴动频繁,多为朝代更替,民不聊生时期。因此,中国历史时期重大事件的发生与气候变化之间,具有一定的内在联系。     

海南岛1605年历史地震的海岸沉积记录

海南岛铺前港湾地区1605年发生了华南历史记录的最强烈的地震,地震强度为M7.5,地震造成陆地沉陷成海。根据野外海岸地貌调查和海岸钻孔沉积物岩性特征与粒度、元素比值分析结果,对历史地震的海岸沉积记录进行了初步的研究,4个钻孔位于铺前港湾西岸博度村附近的小型古海湾,昌德、演丰附近的野菠萝岛和道学附近的红树林区潮间带,钻孔沉积记录显示铺前港湾内湾沉陷幅度为2 m,存在明显的差异性,东寨港道学和野菠萝岛附近的钻孔岩心下部为泥状红土,属于成土的风化壳顶部,根据曲口半岛下山村附近的海岸调查,强海洋动力事件形成了高出现代高潮位3.0 m的高位海岸混杂沉积体,可能与1605年地震下沉引发的类似海啸的沉积事件相关。     

A simplified linear feature matching method using decision tree analysis,weighted linear directional mean,and topological relationships

Linear feature matching is one of the crucial components for data conflation that sees its usefulness in updating existing data through the integration of newer data and in evaluating data accuracy. This article presents a simplified linear feature matching method to conflate historical and current road data. To measure the similarity, the shorter line median Hausdorff distance (SMHD), the absolute value of cosine similarity (aCS) of the weighted linear directional mean values, and topological relationships are adopted. The decision tree analysis is employed to derive thresholds for the SMHD and the aCS. To demonstrate the usefulness of the simple linear feature matching method, four models with incremental configurations are designed and tested: (1) Model 1: one-to-one matching based on the SMHD; (2) Model 2: matching with only the SMHD threshold; (3) Model 3: matching with the SMHD and the aCS thresholds; and (4) Model 4: matching with the SMHD, the aCS, and topological relationships. These experiments suggest that Model 2, which considers only distance, does not provide stable results, while Models 3 and 4, which consider direction and topological relationships, produce stable results with levels of accuracy around 90% and 95%, respectively. The results suggest that the proposed method is simple yet robust for linear feature matching.     

OUTREACH TO PRECOLLEGIATE AMERICAN HISTORY TEACHERS: THE UTILITY OF HISTORICAL GEOGRAPHY THEMES *

The utility of introducing historical geography topics into pre-college American history courses is explored through surveys of social studies teachers in New England and at a meeting of the National Council for Geographic Education (NCGE). Many history teachers claim to use geography in their courses, but use mostly map skills, place locations, and determinism. History teachers are interested in materials and workshops on historical geography themes, however, and sample, materials were well received by teachers in attendance at a national and a regional conference.     

THE BUILT ENVIRONMENT AND SOCIAL THEORY: TOWARDS AN ARCHITECTURAL GEOGRAPHY *

This paper critiques the narrow empiricist focus and inadequate theoretical development of much architectural geography. The geographer's concern and interest in the built environment is integrated with a more critical and relevant awareness of social theory. Four theoretical categories of building and architectural function are discussed: buildings as cultural artifacts, as objects of value, as signs, and as a spatial system. Directions for research are proposed for the example of historic preservation.     

历史有感地震处理的原则与方法

对不同时期、不同地区的‘地大震’、‘地震’、‘地微震’的处理原则提出一些看法,并对历史有感地震参数估定方法做了探讨。     

Seismic history and consistent seismicity: Evidence from southern Italy

In this paper a method is proposed to evaluate the seismicity level of an area in a given historical period, based on records of seismic events, source characteristics and intensity attenuation with distance. Also considered is the seismic activity recorded in southern Italy during the 10th and 11th centuries, seismic records being obtained from all available sources. To determine the level of seismicity, a key role is played by source characteristics, i.e. recording modalities and activity periods of recording centers. In addition, models of intensity attenuation with distance allow the assessment of the size of the area under investigation. This paper identifies the areas, in the 10th and 11th centuries, where major earthquakes (M 6.5) did not occur during periods of silence of sources, as well as those where such events cannot be excluded. For each area, different levels of probability were determined by applying the Cox linear logistic model to historical seismic data. The completeness analysis, in terms of area and time-span coverage, is a valuable tool to assess seismicity in seismogenetic areas. The reproducibility of the model for lower magnitude earthquakes (M < 6.5) is reliable.     

MAPGIS地籍管理系统中历史数据的管理

历史数据的管理一直是一个困扰着地籍管理的难题。ＭＡＰＧＩＳ地籍管理系统在借鉴前人方案的基础上,结合自己的特点,提出并采用“整图处理,记录过程”的方法,很好地解决了这个问题,为将来对数据的快速查询,统计,分析打下了坚实的基础。