全文获取类型
收费全文 | 1778篇 |
免费 | 65篇 |
出版年
2020年 | 26篇 |
2019年 | 38篇 |
2018年 | 51篇 |
2017年 | 66篇 |
2016年 | 68篇 |
2015年 | 37篇 |
2014年 | 46篇 |
2013年 | 498篇 |
2012年 | 45篇 |
2011年 | 56篇 |
2010年 | 49篇 |
2009年 | 52篇 |
2008年 | 51篇 |
2007年 | 27篇 |
2006年 | 39篇 |
2005年 | 40篇 |
2004年 | 39篇 |
2003年 | 33篇 |
2002年 | 33篇 |
2001年 | 29篇 |
2000年 | 29篇 |
1999年 | 15篇 |
1998年 | 31篇 |
1997年 | 25篇 |
1996年 | 19篇 |
1995年 | 17篇 |
1994年 | 23篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 14篇 |
1988年 | 12篇 |
1987年 | 16篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 26篇 |
1983年 | 20篇 |
1982年 | 23篇 |
1981年 | 11篇 |
1980年 | 15篇 |
1979年 | 17篇 |
1978年 | 8篇 |
1977年 | 18篇 |
1976年 | 15篇 |
1975年 | 11篇 |
1974年 | 11篇 |
1973年 | 7篇 |
1972年 | 8篇 |
1970年 | 7篇 |
1968年 | 7篇 |
排序方式: 共有1843条查询结果,搜索用时 15 毫秒
141.
Paul Peter Anthony Mazza Fabio Martini Benedetto Sala Maurizio Magi Maria Perla Colombini Gianna Giachi Francesco Landucci Cristina Lemorini Francesca Modugno Erika Ribechini 《Journal of archaeological science》2006
Two stone flakes partly covered in birch-bark-tar and a third without tar on it were discovered in fluvial gravel and clay in central Italy, in association with the bones of a young adult female Elephas (Palaeoloxondon) antiquus and several micromammals. The probable chronology of the stone flakes is compatible with the late Middle Pleistocene suggested by the site's small mammals and geological context. The fauna indicates a cool stadial episode before isotope stage 6. That age means the flakes are the oldest ever found hafted with tar and indicate a greater capacity for late Middle Pleistocene hominins to utilize raw materials available during cold phases. 相似文献
142.
Koehler P 《Journal of the history of the neurosciences》2006,15(1):5-16
Between 1937 and 1959 John Fulton (1899-1960), Sterling Professor of Physiology at Yale University (New Haven) and Willem Verhaart (1889-1983), neuropsychiatrist at Batavia Medical School (Java, Dutch East Indies) corresponded on neuroanatomical topics. Verhaart had easy access to primate brains in Batavia and stayed at Fulton's lab as a Rockefeller fellow (1938-1939), learning techniques of surgery and histology of the primate brain in order to apply it in his own lab. The correspondence relates of their undertakings in research, the preparations for Verhaart's stay in New Haven, the failure of subsequent research plans because of World War II, the camp experiences in Asia by Verhaart, the period of restoration after the war, helped by Fulton, and the political changes (independence) in Indonesia that finally lead to Verhaart's return to the Netherlands in 1950, where he became professor of histology and Director of the Neurological Institute at Leiden University. The correspondence shows how neuroscientists from different parts of the world cooperated. Moreover it is an example of the gradual change from a German (like his teacher Winkler) to an Anglo-American orientation in medical science that started in the beginning of the nineteenth century. 相似文献
143.
Peter Whitridge 《Journal of Archaeological Method and Theory》2004,11(2):213-250
Although the dichotomization of space and place has spawned a lively archaeological discussion, it threatens to devolve into a troublesome binary like sex/gender. Local place-making and universalizing spatial science are not so neatly segregated. Rather than dividing and bounding the notion of an investment of locations with meaning, it can be extended to describe the intricate topologies of bodies and things, as well as landscapes. Places emerge as sites of the hybrid articulation of representations, practices, and things, as spatialized imaginaries. The notion of imaginaries and the rethinking of place are illustrated with Inuit archaeological and ethnographic examples. 相似文献
144.
Abstract. Like many Norwegian elite, Jacob Aall (1773–1844) lived between two national identities – Norwegian and Danish. On the one hand, he was a subject of the Danish crown, educated in Denmark in the refinements of European knowledge and high culture; on the other he was a loyal provincial son of Norway, engaged in building the political and economic autonomy of his homeland. This article examines the two sides of national identity in Jacob Aall's life and work by focusing on the evolution in his understanding of the concept of the Norwegian nation. It argues that the patriotism central to Aall's understanding of modernity and the coming‐to‐age of Norway contains two disparate, but equally necessary sides. The one is characterised by an abiding sentiment of national romantic cultural belonging, the other is a learned commitment to the Enlightenment utilitarian principles that gave force to the Norwegian national movement. 相似文献
145.
146.
Peter A. Rogerson Eric Delmelle Rajan Batta Mohan Akella Alan Blatt Glenn Wilson 《Geographical analysis》2004,36(2):177-194
It is often desirable to sample in those locations where uncertainty associated with a variable is highest. However, the importance of knowing the variable's value may vary across space. We are interested in the spatial distribution of Received Signal Strength Indicator (RSSI), a measure of the signal strength from a cell tower received at a particular location. It is crucial to estimate RSSI values accurately in order to evaluate the effectiveness of mayday systems designed for rapid emergency notification following vehicle crashes. RSSI estimation is less important for locations where the probability of a crash is low and where the likelihood of call completion is either close to zero or one. We develop a method for augmenting an initial spatial sample of RSSI values to achieve a high‐precision estimate of the probability of call completion following a crash. We illustrate the approach using data on RSSI and vehicle crashes in Erie County, NY. 相似文献
147.
148.
Peter Bleed 《Journal of Archaeological Method and Theory》2008,15(1):154-166
Skill is a challenging topic for archeologists because it requires balancing the biases of cultural relativity with the commonsense
understanding that some humans are more able than others. Using the content and results model of technology, this paper identifies
skill as a variable of technological knowledge with recognizable material results. Late Paleolithic Japanese blade and microblade
assemblages suggest that skill differentials exist on the cognitive, operational, and motor levels. These examples, together
with ethnoarcheological consideration of modern potters suggest material reflections of technical skill. These include regularity
in performance and product, skilled tools, and obvious signs of practice. 相似文献
149.
Peter D. Little John McPeak Christopher B. Barrett Patti Kristjanson 《Development and change》2008,39(4):587-611
Understanding and alleviating poverty in Africa continues to receive considerable attention from a range of diverse actors, including politicians, international celebrities, academics, activists and practitioners. Despite the onslaught of interest, there is surprisingly little agreement on what constitutes poverty in rural Africa, how it should be assessed, and what should be done to alleviate it. Based on data from an interdisciplinary study of pastoralism in northern Kenya, this article examines issues of poverty among one of the continent's most vulnerable groups, pastoralists, and challenges the application of such orthodox proxies as incomes/expenditures, geographic remoteness, and market integration. It argues that current poverty debates ‘homogenize’ the concept of ‘pastoralist’ by failing to acknowledge the diverse livelihoods and wealth differentiation that fall under the term. The article concludes that what is not needed is another development label (stereotype) that equates pastoralism with poverty, thereby empowering outside interests to transform rather than strengthen pastoral livelihoods. 相似文献
150.