全文获取类型
收费全文 | 284篇 |
免费 | 3篇 |
专业分类
287篇 |
出版年
2024年 | 7篇 |
2023年 | 6篇 |
2022年 | 4篇 |
2021年 | 6篇 |
2020年 | 13篇 |
2019年 | 12篇 |
2018年 | 11篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 9篇 |
2014年 | 6篇 |
2013年 | 35篇 |
2012年 | 22篇 |
2011年 | 17篇 |
2010年 | 12篇 |
2009年 | 12篇 |
2008年 | 20篇 |
2007年 | 16篇 |
2006年 | 12篇 |
2005年 | 6篇 |
2004年 | 1篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
排序方式: 共有287条查询结果,搜索用时 0 毫秒
11.
湖北丹江口市连沟旧石器遗址调查 总被引:1,自引:0,他引:1
本文对湖北丹江口市连沟遗址Ⅲ、Ⅱ级阶地所发现的 201件石制品进行了详细的介绍, 并对其时代和文化特征进行了初步研究, 得出它们的时代分别为旧石器时代早期和中期, 在文化面貌方面, 其同属于南方砾石石器工业的范畴。该遗址的发现对研究南方砾石器工业的时代以及认识该工业的早、中期遗存之异同具有重要的意义。 相似文献
12.
Stephen M. Chignell 《The Canadian geographer》2023,67(1):52-73
Critical physical geography (CPG) calls for integrative research on material landscapes and the socio-political dynamics of scientific knowledge production. Network analysis, a rich tradition of tools and approaches for analyzing relational information, has seen little use in the CPG literature to date. This represents a fruitful opportunity, as many of CPG's core interests—knowledge politics, histories of scientific concepts, and ecosocial relations—can be effectively analyzed using network techniques. In this article, I argue for adapting network approaches to CPG. First, I provide an overview of various network concepts, approaches, and their origins. I then discuss bibliometric network techniques for “science mapping” including co-word, co-authorship, and citation analyses. Next, I describe discourse network analysis, a recent mixed-method approach from political science. Finally, I discuss overlaps with emerging approaches from qualitative and visual network analysis. In each section, I provide existing and hypothetical examples, as well as software and visualization techniques, that demonstrate how network approaches could add new insights to CPG and related scholarship. Linking CPG with the diverse traditions of network analysis has the potential to produce new empirical understandings and bring the field into conversation with a growing body of research that spans the social sciences, natural sciences, and humanities. 相似文献
13.
肖启荣 《中国历史地理论丛》2008,23(1):34-43
明清时期国家对于汉水下游的水利管理制度经历一个变迁的过程,与这一区域的水利问题的日益突出密切相关,垸田的发展以及带来的问题是主要的因素。钟祥至沙洋的汉江干堤极易溃决,并且关系到整个下游地区的安全,因此在人力组织、资金筹集、岁修维护上,国家的政策表现出明显的倾斜性,相对于沙洋以下的区域,给予了充分的重视。沙洋以下,天门、潜江、沔阳等州县所在区域主要以垸田为主,国家将这一区域的堤防修筑与维护主要交由地方来进行。垸堤岁修维护采取堤甲制的组织形式,由垸民完成,一方面没有固定的资金,另一方面在正常年景之下,垸民可以获得基本的物质生存,因此垸堤的维护面临相当的困难。 相似文献
14.
STEVE N. GILLANDERS NICHOLAS C. COOPS MICHAEL A. WULDER NICHOLAS R. GOODWIN 《The Canadian geographer》2008,52(4):466-485
A major advantage of satellite remote sensing is that the imagery acquired provides a synoptic view of the landscape. Thus, repeat coverage by the satellite on a regular basis permits the detection of changes in land‐cover over time. This study demonstrates the application of remote sensing technology to the monitoring of mining activities at the Athabasca Oil Sands region of Alberta, Canada. First, we describe the techniques used to match a time sequence of Landsat imagery, both spatially and spectrally, to ensure that the spectral changes through time are due to land‐cover variations. A series of spectral trajectories were then extracted to assess changes in land‐cover through time. Secondly, a land‐cover classification was produced from the baseline 1984 imagery and, using historic and future mine extents, the classification was analyzed to determine the proportion of each land‐cover type affected through development. Results of the analysis indicate that since 1984 there has been a larger reduction in mixedwood dense and broadleaf vegetation classes than mixedwood sparse or dense conifer stands in the area. Based on the delineations of mine‐site activity, the area of woodland and wetland habitat subject to development has increased from approximately 2,520 hectare (ha) in 1984 to 32,930 ha in 2005. 相似文献
15.
TILO FELGENHAUER 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2012,103(4):385-395
Some of the most important features of modern societies are the specialisation of knowledge, the development of technology and its ubiquitous integration in everyday practices. Apparently, the routine use of complex transport, communication and retail systems can only work out as long as a continuous encoding and decoding of spatial information takes place. In this paper different modes of system‐user‐interaction and the involved spatial concepts will be examined. The outcome is a framework of three conceptual types of interaction (or translation) between the geography of the system and the geography of the user's lifeworld. First, the user learns about the internal spatial code of the system to achieve ‘white‐box‐transparency’. Second, efforts in interface‐design show the attempt for ‘lifeworld‐simulation’ by replicating the individual's spatial perception. Third, common geographical imaginations, names of cities, regions or nations, can serve as a ‘third language’ which both the system and the user can refer to. 相似文献
16.
17.
Hanns-Hermann Müller 《International Journal of Osteoarchaeology》1992,2(4):311-324
This paper is the outcome of a lecture held at the Institute of Archaeology, University College London. It provides a summary in English of the archaeozoological research work which has been carried out in Central Europe during the last 30 years, with special reference to material from medieval times. It is shown that a thorough zoological analysis of bones from excavations provides much information for historical interpretation. Not only was the ratio of wild and domestic animals or of the different species of interest, but also the age and sex structure of the population by taking the function of the site into consideration. Some observations on animal teeth gave indications of distinctive handicrafts. Cut marks on cervical vertebrae of horse skeletons found as grave goods from early medieval times were considered in connection with beliefs and juridical conceptions of that time. 相似文献
18.
19.
中外滑雪旅游的比较研究 总被引:6,自引:0,他引:6
本文就滑雪旅游历史进程、自然地理条件、滑雪地与滑雪场建设、客源市场状况等方面进行中外对比,旨在促进我国滑雪旅游业稳步、持续地发展。 相似文献
20.
中国古代地缘政治空间结构过程及模式研究 总被引:1,自引:0,他引:1
中国古代地缘政治的发展过程具有一种长周期内的重复态势。地理环境是空间结构存在的大尺度控制和自然基础。空间结构的动态过程包括秦以前结构的发生、发展和演变,秦以后结构的融合、扩散和模式化,反映中国古代地理政治化和政治地理化的两个阶段。结构模式的静态分析,初步揭示了结构的一些重要功能特性,主要有强大的整体功能,独特的边缘效应和通过圈层同构,结构复制所展现出来的稳定性的复杂表现。对中国古代地缘政治空间结构的分析,是大尺度的整体轮廓研究,随着空间结构研究尺度的细化,可进一步对中国古代政治过程的诸多特性做出结构主义的揭示,从而推动中国古代政治历史研究的深化。 相似文献