首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   400篇
  免费   18篇
  2023年   2篇
  2022年   5篇
  2021年   2篇
  2020年   18篇
  2019年   17篇
  2018年   22篇
  2017年   20篇
  2016年   25篇
  2015年   11篇
  2014年   14篇
  2013年   79篇
  2012年   18篇
  2011年   27篇
  2010年   19篇
  2009年   15篇
  2008年   23篇
  2007年   15篇
  2006年   11篇
  2005年   9篇
  2004年   7篇
  2003年   7篇
  2002年   9篇
  2001年   13篇
  2000年   3篇
  1999年   3篇
  1998年   4篇
  1997年   3篇
  1996年   1篇
  1995年   4篇
  1994年   1篇
  1993年   1篇
  1992年   2篇
  1991年   1篇
  1990年   1篇
  1989年   4篇
  1988年   1篇
  1978年   1篇
排序方式: 共有418条查询结果,搜索用时 15 毫秒
51.
The article describes lithic industries of the Upper Paleolithic levels of Kulbulak, Uzbekistan, a key site in southwestern Central Asia based on materials from excavations at several sites in the western and northwestern Pamir– Tien Shan region (Kulbulak, Kyzyl-Alma-2, Dodekatym-2, and Shugnou). A new cultural and technological tradition is introduced, for which the authors suggest the name Kulbulakian. Its distinctive features are the bladelet technique and a microlithic set including backed pieces and triangular microliths. Stages in the evolution of the Kulbulakian tradition are reconstructed: origins, development, peak, and disappearance of the carinated technology. Industries belonging to this tradition have shaped the general appearance of the Upper Paleolithic in the area in question.  相似文献   
52.
We present a scheme to modify empirical Green's functions by attenuation considering: (1) geometrical spreading; (2) decay in high frequency; (3) regional attenuation; and (4) phase of the signal. The accelerograms computed with the proposed simulation method are compared, in time and frequency domains, with strong ground motions from subduction and intermediate-depth earthquakes recorded in Mexico. It is shown that this simple empirical Green's functions technique can synthesize both the shape and amplitude of the response spectra in the site, considering a postulated seismic source located at different distances from the original one.  相似文献   
53.
An American geographer and noted international authority on water management problems in Russia and Central Asia presents an account of an expedition, in late 2005 (under the sponsorship of the National Geographic Society) to Kazakhstan and Uzbekistan, focused on the Aral Sea. The steadily drying inland sea, with a surface area of 67,500 km2 in 1960, had split into two parts and shrunk to 17,380 km2 in 2006. The paper provides an up-to-date overview of the crisis and presents an optimistic scenario of the sea's future, noting development of economic activities (particularly fisheries) in its surrounding settlements. Journal of Economic Literature, Classification Numbers: O13, Q15, Q25. 6 figures, 1 table, 55 references.  相似文献   
54.
55.
Abstract

Among several groups vulnerable to discrimination in 21st century Europe, Roma loom large because the poorer, traditionally-minded elements continue to resist integration and remain on the margins of society. Most of the people involved have become EU citizens as a result of recent accession by East Central European countries where marginalisation has been tolerated, with varying degrees of discrimination, ever since the 19th century abolition of feudalism. In the interest of a more inclusive society, Roma are now being encouraged to strive for living standards comparable with those enjoyed by the mainstream population. This paper concentrates on Romania, which has one of the largest Roma communities in Europe. We profile the situation with some reference to regional geographies and previous policy history. We examine the key concepts relevant to marginality, arguing for an element of self-exclusion, because while many Roma elements have been successfully assimilated over the years, a large residual element insists on preserving elements of ‘identity’, implying separation from the mainstream in terms of the modernising ethos and the rule of law. The main thrust of the paper rests with a comprehensive programme to improve the condition of the Roma community as a major element among a number of other factors which are working towards the same objective. We give particular attention to the education programme that is now making significant progress.  相似文献   
56.
Abstract

Between 1914 and 1935, the cities of Vienna and Pressburg/Bratislava were linked by an electric railway known as the Pressburgerbahn. More than just a line of transportation, the railway became intertwined with the complex politics of identity in Pressburg. The Pressburgerbahn presented nationalists in the Habsburg Empire with a dilemma: it had the potential to contribute to the unification of the nation, but at the same time was transnational by definition. This paradox generated a heated controversy about the Pressburgerbahn between Magyar nationalists and the predominantly German-speaking Pressburg bourgeoisie. Using biologized rhetoric, Hungarian politicians and journalists portrayed their nation as a body politic that was disfigured by having a railway ‘vein’ cross the border into Austria, in particular from such a peripheral location as Pressburg. By contrast, the discourse of the German-speaking bourgeoisie was firmly anchored in an imperial, supra-ethnic landscape. This controversy was replayed following the incorporation of the renamed city of Bratislava into Czechoslovakia in 1919: the Prague-based Ministry of Railways employed the rhetoric of the railway as an integrating structure within the body politic, while the eventual closure of the Pressburgerbahn in 1935 was closely connected to the belated nationalization of Bratislava. The railway to Vienna thus became a symbol of the liminal status of the town as a whole, in terms of nation, geography, politics and culture.  相似文献   
57.
Despite rising numbers of unaccompanied child migrants in the Americas, very limited research directly engages with youth as they journey north to seek protection in the United States. In this article, we examine young Central American migrant experiences of bordering, focusing on policing and shelter management. Part of a wider binational, interdisciplinary, and multi-scalar research project along the Mexico-U.S. border, which began on the heels of Programa Frontera Sur, we draw on interviews and a participatory workshop with migrant youth, and complementary interviews with migration officials and shelter workers. Through the uniquely insightful accounts of children themselves, we show how care work in shelters and direct control via policing emerge as powerful and connected techniques of bordering. In these spaces of connected securitization and humanitarian management, children negotiate highly violent, emotional, and extra-legal interactions with officials. These include extortion, apprehension, aggression, confinement and deception, but also disciplinary forms of care and protection. Our findings deepen and complicate extant work on the humanitarian care/control nexus via our focus on, and direct research with, youth from Central America in Mexico. Their narratives make clear that state policies such as Programa Frontera Sur expand the geographies of bordering and bring practices of migrant care and control into deeper relation. This bordering blocks children's access to legal protections like asylum; leaves them more exposed to exploitation and rights abuses; and encourages greater risk-taking in migration journeys.  相似文献   
58.
This article explores how in the years after 1980 a spectrum of historical actors came to see petroleum platforms in the Gulf of Mexico as a necessary part of the Gulf ecosystem and how such views affected platform removal policies. Through a discourse analysis of the Rigs‐to‐Reefs program, in which old offshore petroleum facilities were converted into artificial reefs, this article examines how actors presented to the public their notions of the relationship of the Gulf ecosystem with technological offshore structures. Through this case we see how ideas of technology and nature were mutually constructed via discourses and what affect that had on policies.  相似文献   
59.
In 1521, the Spanish conquistadors defeated the Nahuas of Central Mexico. Spain was ruled at the time by the House of Habsburg, and its administrators became familiar with the German concept of Landschaft. By 1570, they used this concept to prepare and launch a survey of the indigenous communities which called themselves—and their lands—altepetl. The purpose of this paper is to show to what extent the terms Landschaft and altepetl are equivalent since modern scholars have described both as organized “communities” subject to a customary “law” and possessing a specific piece of “land”. The main obstacle for this comparison is that in the sixteenth century the Spaniards did not have a word equivalent to landscape, and they used words like pueblo, pago and pintura instead, depending on the context. This paper describes the general characteristics of the altepetl in Central Mexico and focuses on its representation by analysing some maps made after the conquest in the area of Cholula, current State of Puebla. The comparison of Landschaft, pueblo and altepetl in historical context is pertinent for cultural geographers since it was during the sixteenth century that the concept of landscape, as we know it today, was taking shape.  相似文献   
60.
While surface collection constitutes an important component of field research at the site and regional levels, the association between surface and sub-surface materials needs to be examined through independent lines of evidence. This study employed manual bucket auger probing and soil geochemistry at the Formative site of Tlalancaleca, Central Mexico (800 b.c.a.d. 250), to evaluate the results of surface collection and to understand the formation process of the anthropogenic landscape. The combined results at one of the largest architectural complexes at Tlalancaleca indicate that it was built during the Late Formative period (500–100 b.c.) and rebuilt during the subsequent Terminal Formative period (100 b.c.a.d. 250), which is corroborated by radiocarbon dates. Moreover, the results suggest segregated uses of space such as cooking/storage, waste disposal, and craft production areas within the complex. Overall results demonstrate the effectiveness of this multi-method approach for reconstructing occupational history and activity areas.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号