浅谈延庆地震台地电阻率观测系统改造

分析了延庆地震台地电阻率观测中存在的干扰因素，以此说明观测系统进行改造的必要性，介绍了电极和外线路改造的过程和技术环节，通过改造前后观测资料的对比分析对改造的效果进行了评价。     

水库及周缘地区诱发地震危险性评定的一种模型及其应用

对已蓄水并建有地震观测台网、毗邻长江三峡水库的湖北清江隔河岩水库及其周缘地区各不同位置的诱震总体组合环境（条件）及相应的诱发地震活动结果进行统计、计算和分析,建立了一种诱发地震危险性评定模型,据此模型对长江三峡水库及其周缘地区的水库诱发地震危险性进行了预测和评价     

Arc-type and intraplate-type ridge basalts formed at the trench-trench-ridge tripIe junction: Implication for the extensive sub-ridge mantle heterogeneity

Abstract ' In situ basalts' represent the ridge magmatism at and close to the ancient trench-trench-ridge triple junction. Such basalts in the Amami, Mugi, and Setogawa accretionary complexes, Southwest Japan, were described and analysed. The geochemical data show that the ' in situ basalts' include all the types of basalts, ranging from alkali basalts and high-alumina basalts to tholeiites, and the compositions tend towards intermediate and silicic rocks. The data also reveal that the ridge basalts are indistinguishable both from the island arc and intraplate basalts, no affinities with mid-ocean-ridge basalts. The sub-ridge mantle adjacent to the triple junction had a component of sub-arc mantle, and this mantle heterogeneity can be generated by the formation of a slab window.     

Environmental Geochemistry of Heavy Metal Contaminants in Soil and Stream Sediment in Panzhihua Mining and Smelting Area,Southwestern China

Mining and smelting activities are the main causes for the increasing pollution of heavy metals in soil, Water body and stream sediment. An environmental geochemical investiga-tion was carried out in and around the Panzhihua mining and smelting area to determine the ex-tent of chemical contamination in soil and sediment. The main objective of this study was to in-vestigate the environmental geochemistry of Ti, V, Cr, Mn, Cu, Pb, Zn and As in soil andsediment and to assess the degree of pollution in the study area. The data of heavy metal con-centrations reveal that soils and sediments in the area have been slightly contaminated. Geo-chemical maps of Igeo of each heavy metal show that the contaminated sites are located in V-Ti-magnetite sloping and smelting, gangues dam. The pollution sources of the selected elementscome mainly from dusts resultant from mining activities and other three-waste-effluents. The areaneeds to be monitored regularly for trace metal, especially heavy metal enrichment.     

基于POI数据的长春市商业空间格局及行业分布

商业网点的空间集聚与分散是零售商业活动的重要表现,其合理化布局对发展城市经济、满足居民消费需求发挥着重要作用。基于核密度估计、区位熵指数及Ripley's K函数分析法,以长春市中心城区商业类城市兴趣点（POI）数据为基础,在分析城市商业空间格局特征的基础上,进一步从行业空间分异的视角,研究城市商业空间的行业分布及集聚特征。结果表明：① 长春市商业网点空间分布的集聚特征显著,并呈现多中心的分布形态,基于道路格网单元的商业网点热点区分布与识别的商业密度中心分布总体一致;② 不同商业中心表现出不同的等级规模差异,整体等级规模结构较为合理;③ 零售行业视角下的城市商业空间“中心—外围”分异明显,且不同行业表现出了不同的空间集聚模式;④ 各行业多尺度的空间集聚表现不同,综合零售、家用电器等行业区位选择的空间尺度范围较大,纺织服装、文化体育等行业区位选择的尺度范围较小;⑤ 行业视角的专业化功能区块差异显著,成熟区块呈现多功能要素、多优势行业集聚特征,发展中区块功能较为单一。     

磨刀门河口近期演变及其排洪效应

通过分析珠江磨刀门分流河口水动力结构及拦门沙的走向变化,解析磨刀门河口近期演变,并从河口的结构和功能的角度,分析磨刀门河口的排洪功能和行为。结论认为:(1)磨刀门河口正由径流优势型向河流—波浪型转变,波浪成为改造和修饰口门地形的重要动力;(2)磨刀门河口的动力、地貌变化,使得河口对淡水的防御性增强而渗透性减弱,其排洪潜力有限;(3)强径流河口发育支汊是河口延伸中的基本规律,在今后磨刀门的治理开发过程(尤其是排洪)中应注意支汊的保护利用。     

中国东北地区城市地理基本框架

从东北地区城市地理框架的形成和演变过程出发,对东北地区城市体系框架、中心城市和大都市区、城市群和城市组群等城市地理问题进行了研究。结果表明,东北地区城市地理框架的形成演变过程分为三个时期,即古代城镇形成时期-近代城市形成时期-现代城镇体系形成发展时期。将城市体系结构框架归纳为：自上而下先快后缓的城市化进程,“弱金字塔”型的等级规模结构,沿铁路分布的“T”型空间结构,由“单一”向“新型”发展的城市职能结构。东北地区以哈尔滨、长春、沈阳、大连为中心城市的“四城市时代”已经到来,三省GDP向四城市高度集中,并且依托四市正在形成发展为“大哈尔滨”、“大长春”、“沈阳经济区”和“大大连”四个大都市区。作为城市化发展到一定阶段的产物,东北地区的城市群和城市组群也发育得相对完备而密集,已初步形成“三圈”的基本格局,即辽中南城市群以及吉中、哈大齐等2个大型城市组群。