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   1682篇
  免费   314篇
  2023年   6篇
  2021年   17篇
  2020年   18篇
  2019年   114篇
  2018年   87篇
  2017年   96篇
  2016年   145篇
  2015年   95篇
  2014年   97篇
  2013年   378篇
  2012年   100篇
  2011年   100篇
  2010年   84篇
  2009年   68篇
  2008年   75篇
  2007年   75篇
  2006年   51篇
  2005年   26篇
  2004年   39篇
  2003年   36篇
  2002年   30篇
  2001年   27篇
  2000年   36篇
  1999年   9篇
  1998年   22篇
  1997年   17篇
  1996年   16篇
  1995年   17篇
  1994年   14篇
  1993年   4篇
  1992年   6篇
  1991年   6篇
  1990年   3篇
  1989年   3篇
  1988年   4篇
  1987年   4篇
  1985年   5篇
  1984年   5篇
  1982年   10篇
  1981年   3篇
  1980年   5篇
  1977年   8篇
  1976年   5篇
  1975年   2篇
  1974年   5篇
  1973年   2篇
  1972年   2篇
  1971年   3篇
  1969年   2篇
  1968年   2篇
排序方式: 共有1996条查询结果,搜索用时 15 毫秒
991.
992.
本主要通过唐、宋、元、明、清的历代目录以及外国目录中的录,探究《寒山诗》版本流传的详细情况。  相似文献   
993.
994.
Despite serious waste management problems in Penang Island, a recycling campaign launched in 2001 has met with little success. This may be because the campaign was not backed up with knowledge about factors that motivate recycling. This article develops a simple economic framework to explain individual recycling behaviour. A logit model that utilizes survey data drawn from a sample of 760 respondents was used to test the insights gained from the framework. As predicted by the framework, recycling was negatively related to factors that increased the private costs of recycling, such as the lack of storage space and low income. Recycling increased among respondents who recognized its benefits: they include the environmentally conscious, those who were aware of the recycling campaign and respondents in the twenty‐five to thirty‐five year age category. Interestingly, neither gender nor distance to recycling centres were reliable predictors of recycling behaviour.  相似文献   
995.
This paper presents the first TL dates for burnt quartzites and silcretes from the Still Bay layers of Blombos Cave (South Africa). These layers contained engraved ochres and marine shell beads that could be an early manifestation of symbolic and thus ‘modern’ behaviour by the Middle Stone Age humans. The procedure devised to calculate the ages is presented in detail, particularly with regard to internal microdosimetry, because the problems faced in estimating the dose rates require an approach different from the one usually used on flints and sediments. A mean age of 74 ± 5 ka was obtained for five burnt lithics unearthed in the BBC M1 member of the Still Bay layers. This result is in good agreement with both ESR dates on teeth and OSL dates on sediment, and demonstrates the great antiquity of the archaeological remains discovered at Blombos Cave.  相似文献   
996.
Agricultural research in marginal dry areas can contribute to reducing poverty through the development of technological, institutional and policy options for poor farmers. Such research should address diversified opportunities and development pathways. This article analyses the diversity of livelihood strategies of rural people living in the Khanasser Valley in northwestern Syria, an area that is typical of marginal drylands. It proposes an operational classification of households based on their different livelihood strategies, applying an integrated methodology within a Sustainable Livelihoods framework. Households are classified into three clusters: agriculturists, labourers and pastoralists. The article examines the diversity of livelihoods involved, and considers where and how research should be directed to have greatest impact on poverty. Given that rural households are not homogeneous but dynamic entities, with diverse assets, capabilities and opportunities, the definition of household typologies can help to target development research. The article concludes that while agriculturists benefit most, poor labourers with enough land can also gain from pro‐poor agricultural research. The poorest households with little land, and pastoralists, benefit little or only indirectly.  相似文献   
997.
998.
999.
Theories of stages of life within the anthropology of romanticism. – The essay discusses the importance and prominence of theories about different stages of life in the anthropological and medical discourse of romanticism. This discourse has clearly a stabilising and restaurative function, favouring the age of moderate manhood. The political and social regulative implications of these theories demand a restaurative roll‐back. The essay is based on a concept of sociology of knowledge formation.  相似文献   
1000.
Identifying bilaterally paired bones in zooarchaeological collections rests on the assumption that left and right skeletal elements from the same organism will be symmetrical. Bilaterally paired bones in an individual are, however, typically asymmetrical to some degree, demanding that the question “How symmetrical is symmetrical enough to identify a bilateral pair?” be answered with control data. The degree of symmetry chosen, or tolerance, will influence both how many true pairs in an archaeological collection are not identified (type I error) and how many false pairs are identified (type II error). Bivariate measures of 60 pairs of astragali and 48 pairs of distal humeri of deer (Odocoileus virginianus and O. hemionus) indicate that both sorts of error are frequent even when a conservative level of tolerance (≤average asymmetry) is used. Simulation of an archaeological collection indicates that as sample size increases, frequencies of both kinds of error increase. Application of the matching criteria and tolerance level to an archaeological collection underscores that the analytical requirements of identifying paired bones are steep.  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