环球海洋大气气溶胶化学研究 III：金属形态和入海通量   总被引：8，自引：0，他引：8  

陈立奇  余群  杨绪林 《大气科学》1994,18(2):215-223

中国第三次南极考察和环球科学考察，历经北太平洋、南太平洋、南极半岛海域、南大西洋、北印度洋、以及沿途近岸海域，共收集58个气溶胶样品，采用石墨炉原子吸收法分析其中的水可溶态和酸可溶态的Mn、Fe、Pb、Cu、Cd。气溶胶中金属表现明显陆源向大洋输送的浓度梯度，近岸海域上空金属含量大于大洋上空含量，北太平洋上空含量高于南太平洋和南极半岛海域。气溶胶中金属的水可溶程度，在近岸海域上空依次为Cd＞Mn＞Cu＞Fe＞Pb，百分比分量分别为39%，36%， 23%，14%和5.3%；在大洋上空依次为Cd＞Mn＞Fe＞Cu＞pb，百分比分量分别为62%，44%，11%，3.1%和2.5%。本文还计算和比较各观测海区上空金属从大气输入海水的通量。  相似文献   

World Patterns of Geographic Literacy Based on Sketch Map Quality     

Thomas F. Saarinen  Charles L. MacCabe 《The Professional geographer》1995,47(2):196-204

This paper discusses world patterns of geographic literacy and illiteracy based on the quality of sketch maps of the world drawn by university students in first-year geography classes. The study, sponsored by the International Geographical Union and funded by the National Geographic Society, contains 3,568 sketch maps of the world collected from 75 sites in 52 countries. For the purposes of this paper, geographic literacy is equated with the number of nations and continents included on the sketch maps. The individual map scores are aggregated to determine the average number of items per map for each site and nation. Our set of maps provides a baseline of world variations in geographic literacy just prior to the end of the Cold War. The sketch map techniques can be used to monitor changes in geographic literacy.  相似文献   

世界遗产地西湖的物理拥挤和心理拥挤关系   总被引：1，自引：0，他引：1  

李风琴  杨效忠 《地理科学》2017,37(1):102-109

分析世界遗产地西湖各小景点的景观功能性差异和西湖申遗成功后主要收费景区客流的时空分布特征,梳理出4类观测点,分别测算出其物理拥挤度和心理拥挤度,探讨两者的关系以甄别中国国情下的旅游心理拥挤的关键性物理影响因子。得出结论：① 世界遗产地西湖的物理拥挤和心理拥挤的表征关系为一个近似的坐标轴的关系;② 遗产地西湖在拥挤管理上应实行分象限管理。③ 中国情境下,世界遗产地西湖的游客心理拥挤的主要物理影响因素为景区面积和景区引导标识系统。  相似文献   

Continuity markers as an aid for children in finding the peripheral continuity of world maps     

Pontus Hennerdal 《制图学和地理信息科学》2013,40(1):76-85

ABSTRACT

Many map readers, including both children and adults, find it difficult to determine where they would be located along the edge of a world map after crossing that edge. Different types of markers have long been drawn close to the map’s edge – for example, in an atlas – to help map readers identify the map upon which they will find themselves if that edge is passed. In this study, a method similar to that used to show the continuity between maps in an atlas has been tested to determine whether continuity markers can also be used to help map readers find a world map’s actual peripheral continuity. The study involved children between the ages of 10 and 13 years and showed that continuity markers do help children determine the map’s actual peripheral continuity, in combination with a lesson that describes how to find the actual peripheral continuity of a world map. This article, therefore, concludes that continuity markers for world maps can be a useful part of map design that clarifies how the edges of a world map fit together for children who have learned to use this tool.  相似文献   

Filling Some Black Holes: Modeling the Connection Between Urbanization,Infrastructure, and Global Service Intensity     

Elien Van De Vijver  Ben Derudder  David Bassens  Frank Witlox 《The Professional geographer》2013,65(1):82-90

This empirical article combines insights from previous research on the level of knowledge-intensive service in metropolitan areas with the aim to develop an understanding of the spatial structure of the global service economy. We use a stepwise regression model with the Globalization and World Cities research network's measure of globalized service provisioning as the dependent variable and a range of variables focusing on population, infrastructure, urban primacy, and national regulation as independent variables. The discussion of the results focuses on model parameters as well as the meaning of outliers and is used to explore some avenues for future research.  相似文献   

Transformations of the Spatial Hegemony of the Courtyard in Post-Soviet St. Petersburg     

Megan Dixon 《Urban geography》2013,34(3):353-375

Abstract

The courtyard is a space that existed before, during, and now after the Soviet period in Russian urban history. Noting the change in the courtyard's formerly hegemonic position on daily trajectories illustrates both Harvey's and Lefebvre's suggestions for uncovering the way that spaces articulate social values. A particularly revealing case study occurs in the struggle over including courtyards in a Chinese developer's project for a new multi-use district outside St. Petersburg. A brief history of the courtyard in Soviet planning allows subsequent analysis of the ways in which the city administration, the Chinese design team, and Russian planners deployed the courtyard as a spatial code for social meaning in design discussions. Examining the change in function and conceptualization of the courtyard shows how different groups in post-Soviet Russia seek to retain or redeploy concepts of the “collective” as they attempt to remake St. Petersburg as a successful “world” city.  相似文献   

新时期中华民族精神的培育     

吴桂花 《广东海洋大学学报》2003,23(5):129-133

民族精神是一个民族赖以生存和发展的精神支撑。建设中国特色的社会主义现代化事业是一项前无古人的伟大创举 ,它更加需要一种积极向上的民族精神的支撑。培育新时期的中华民族精神是我们的一项重要任务 ,在培育民族精神的时候应该继承民族文化的优秀传统 ,吸收其他民族文化的优秀成分 ,同时又要使民族精神保持与时俱进 ,不断丰富和发展  相似文献   

Virtual Field Geologic Trip System     

Jian Wang  Linfu Xue  Xiaojun ZhouCollege of Earth Sciences  Jilin University  Changchun  China 《东北亚地学研究》2003,(2)

1IntroductionThe objective of developing Virtual Field Geo-logic Trip System (VFGTS)is for geologic educa-tion and research, 3D geologic information system. The key technique of VFGTS is scientific visualiza-tion. In a virtual geologic world users can have a geologic exploration, observation and research. The technique of visualization appeared in 1987. It is a technique of transforming the data gained by experiment or numerical calculation into the image which can be accepted…  相似文献   

After 1492: Nature Rebounds          下载免费PDF全文

William M. Denevan 《Geographical review》2016,106(3):381-398

Postapocalypse stories about human survival and rebound of nature following mass disaster are a familiar genre. A major real world example is the demise of most Native Americans after 1492. This essay is a review of some of what is known about the subsequent return of forests and the explosion of wildlife numbers in the neotropics and in North America. The belief by many early Europeans in the New World, including influential postcolonial writers, that the bounty they observed had preceded them, was mostly false.  相似文献   

四川盆地东缘寒武系盐下油气勘探领域探讨     

冯许魁  陈友智  臧殿光  李明杰  巫芙蓉  梁虹  杨晓  郭海洋  赵振伟 《地质论评》2023,69(6):2023060003-2023060003

地球物理资料显示四川盆地东缘齐岳山附近寒武系高台组膏盐岩层下深部存在逆冲构造,其形成过程以及油气地质意义未见深入研究。笔者等综合四川盆地东部石柱地区线束三维和建南地区二维地震反射资料,并结合钻井资料以及区域地质研究成果,从构造继承性的角度探讨四川盆地震旦系灯影组台缘带类型,并分析了川东地区寒武系盐下油气圈闭特征。研究获得如下认识：① 川东齐岳山北段构造变形强烈,普遍发育基底卷入构造,构造样式受青白口纪—南华纪裂谷与转换带构造位置的控制。② 依据构造继承关系将盆内灯影组台缘带划分为德阳—安岳地区原生型台缘带、万源—达州地区继承型台缘带以及石柱地区继承—改造型台缘带。③ 依据青白口纪—南华纪裂谷的分布和后期构造作用影响大小,认为沿齐岳山向南至南川一带存在与石柱地区相似的灯影组继承—改造型台缘带,忠县、南川以西存在灯影组继承型台缘带。④ 研究区新元古界—下寒武统烃源岩、灯影组—龙王庙组滩相白云岩储层与寒武系膏盐岩层系构成完整的生储盖组合。⑤ 寒武系盐下基底逆冲可形成成排、成带的构造,与灯影组继承—改造型台缘带、龙王庙组滩相白云岩储层配置,形成断层相关的构造—岩性圈闭带,成为川东地区油气规模聚集有利区。研究认为四川盆地东部石柱地区震旦纪—早寒武世早期继承了青白口纪—南华纪裂谷构造特征,燕山期构造反转,高台组盐下形成基底卷入逆冲构造,具备生储盖等基本石油地质条件,具有重要的油气勘探现实意义。  相似文献