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   7730篇
  免费   402篇
  2023年   41篇
  2020年   138篇
  2019年   189篇
  2018年   262篇
  2017年   243篇
  2016年   303篇
  2015年   200篇
  2014年   193篇
  2013年   2098篇
  2012年   237篇
  2011年   267篇
  2010年   249篇
  2009年   233篇
  2008年   205篇
  2007年   214篇
  2006年   177篇
  2005年   115篇
  2004年   104篇
  2003年   101篇
  2002年   120篇
  2001年   147篇
  2000年   108篇
  1999年   117篇
  1998年   98篇
  1997年   82篇
  1996年   88篇
  1995年   70篇
  1994年   62篇
  1993年   73篇
  1992年   73篇
  1991年   60篇
  1990年   61篇
  1989年   58篇
  1988年   52篇
  1987年   60篇
  1986年   60篇
  1985年   70篇
  1984年   81篇
  1983年   84篇
  1982年   68篇
  1981年   68篇
  1980年   66篇
  1979年   61篇
  1978年   66篇
  1977年   67篇
  1976年   61篇
  1975年   72篇
  1974年   42篇
  1973年   40篇
  1972年   42篇
排序方式: 共有8132条查询结果,搜索用时 15 毫秒
991.
992.
The study of food in the middle ages attracted much interest among antiquarians from the eighteenth century on. New perspectives came with the growth of social and economic history. Over the last two decades, re-evaluations of historical sources, along with contributions from other disciplines, especially archaeology, the archaeological sciences, anthropology and sociology, have changed the possibilities for this area of research. The study of cooking, of cuisine and its cultural context, as much as food production and the material conditions of life, is now central to developing our understanding of consumption. This paper explores new possibilities for the study of taste and demotic cuisine, food and virtue, the association of women with food, and the role of food in society and in cultural change.  相似文献   
993.
Although the dietary importance of barnacles is recognized in Europe and elsewhere around the world, indigenous use of barnacles on the Pacific coast of North America has not been well-documented. On the Northwest Coast, most shell middens located along estuaries are dominated by clams (such as Saxidomus, Protothaca, etc.), while those on the outer coast are dominated by mussels (Mytilus californianus). At Kit’n’Kaboodle Cave in southeast Alaska, the acorn barnacle Semibalanus cariosus is unusually abundant over a 3500-year period, but is replaced by mussels over time. These results are placed within a larger geographic context to more closely examine patterns of barnacle use by First Nations of the Pacific Northwest.  相似文献   
994.
In the last 15 years, the regional scale was used to implement innovation strategies in European Union. Departing from the discussion of the relevance of innovation policy at the regional level, the article benefits from the knowledge production function framework to estimate patterns considering 175 European regions. It is intended to understand whether regional innovation strategies developed and applied between 1994 and 2001 were successful at an aggregated level in contributing for knowledge creation measured in terms of patents and high technology patents. The results underline the relevance of private R&D expenditure and medium and high technology employment to increase patent numbers. The models suggest also that administrative regionalization may be important to regional innovation and that the creation and implementation of a regional strategy have a positive contribution for high tech innovation.  相似文献   
995.
City planning is essential for providing physical environment for better community life and for providing green areas, while conserving historical heritage is an important achievement in city planning, particularly for historical cities such as Diyarbakir city. The focus of this paper is to outline how increasing the ratio of green area in the city centre of Diyarbakir, Turkey, with a land-use betterment model exemplified sustainable urbanism. We observed an applied urban design project that included both opening up free space to the public and increasing the amount of available green area. The project addressed an area adjacent to the Diyarbakir city walls, which are important not only for their history but also as reflections of the urbanization process of Diyarbak?r from prehistoric time to the twenty-first century. We have noticed that changes in the design area provided understanding of the city planning by public and supplied more green areas for children and women. Thus, the city became more desirable and more sustainable.  相似文献   
996.
In this comparative study of two water basins in the Middle East, we examine the hydro-political construction of scale as central to state and nation building, and their territorial consolidation. We argue that scalar negotiations and constructions of freshwater became central to the very consolidation of both Turkey and Israel. The examples we offer also illustrate the usefulness of a performative approach to scale, benefiting from but moving beyond a politics of scale approach. The comparative focus on hydro-scalar politics and performativities in relation to state and nation building offered a) lends to an enriched understanding of water politics in these two contested river basins, b) enables fuller understanding of how water becomes central to the processes by which nations, states, and territories are consolidated in this region, and c) contributes to recent debates in political geography by demonstrating the value of scalar and performative approaches. Underscoring these linkages, the analysis differs from many works on water in the Middle East, contributes to studies of state and nation building as contested processes, and avoids the assumption of state or national scales as ontological pre-givens.  相似文献   
997.
998.
999.
1000.
The age of Neanderthal remains and associated sediments from El Sidrón cave has been obtained through different dating methods (14CAMS, U/TH, OSL, ESR and AAR) and samples (charcoal debris, bone, tooth dentine, stalagmitic flowstone, carbonate‐rich sediments, sedimentary quartz grains, tooth enamel and land snail shells). Detrital Th contamination rendered Th/U dating analyses of flowstone unreliable. Recent 14C contamination produced spurious age‐values from charcoal samples as well as from inadequately pretreated tooth samples. Most consistent 14C dates are grouped into two series: one between 35 and 40 ka and the other between 48 and 49 ka. Most ESR and AAR samples yielded concordant ages, ranging between 39 and 45 ka; OSL dating results permitted adequate bracketing of the sedimentary layer that contained the human remains. Our results emphasize the value of multi‐dating approaches for the establishment of reliable chronologies of human remains.  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