全文获取类型
收费全文 | 1509篇 |
免费 | 86篇 |
出版年
2024年 | 8篇 |
2023年 | 33篇 |
2022年 | 8篇 |
2021年 | 18篇 |
2020年 | 67篇 |
2019年 | 60篇 |
2018年 | 139篇 |
2017年 | 110篇 |
2016年 | 94篇 |
2015年 | 77篇 |
2014年 | 63篇 |
2013年 | 238篇 |
2012年 | 82篇 |
2011年 | 77篇 |
2010年 | 70篇 |
2009年 | 87篇 |
2008年 | 59篇 |
2007年 | 56篇 |
2006年 | 35篇 |
2005年 | 35篇 |
2004年 | 13篇 |
2003年 | 22篇 |
2002年 | 19篇 |
2001年 | 15篇 |
2000年 | 16篇 |
1999年 | 9篇 |
1998年 | 7篇 |
1997年 | 8篇 |
1996年 | 7篇 |
1995年 | 12篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1989年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有1595条查询结果,搜索用时 125 毫秒
51.
Zbigniew M. Bochenski Teresa Tomek Krzysztof Wertz Małgorzata Kaczanowska Janusz K. Kozłowski Adamantios Sampson 《Archaeological and Anthropological Sciences》2018,10(7):1603-1615
The taphonomic analysis of avian remains from Sarakenos Cave reveals that, contrary to previous suggestions, many bird bones excavated there represent food remains of the Eagle Owls rather than humans. The conclusion is based on the presence of traces of digestion, beak and claw punctures, and indirect evidence that includes relative preservation of particular elements, species composition, the lack of cut marks, and the absence of numerous traces of burning. Specimens with medullary bone and traces of digestion indicate that the owls killed breeding females in spring. Since it is unlikely that owls shared the cave with humans at the same time, it supports the notion based on archeological evidence that human groups did not inhabit it permanently. 相似文献
52.
J. Petřík D. Sosna L. Prokeš D. Štefanisko P. Galeta 《Archaeological and Anthropological Sciences》2018,10(4):893-904
Despite the large-scale expansion of Bell Beaker phenomenon, there is a tension between the normative Bell Beaker material culture categories and their local objectification in the form of real artefacts. Stone projectile points provide an opportunity to evaluate how much was the general category of such a point influenced by regional and local factors. The aim of this paper is to explore shape and size variation of Central European Bell Beaker projectile points from Moravia (Czech Republic) to elucidate factors responsible for this variation. The sample consists of 194 projectile points from 54 Central European Bell Beaker sites (2500–2300/2200 BC) distributed in Morava River catchment. The size and shape of projectile points were studied by landmark-based geometric morphometrics and expressed as shape groups, which have been assessed in terms of their spatial distribution, raw material, and reutilization. Although several shape categories of points were identified, there is a strong degree of uniformity in the research sample. The dominant shape category (75.4 % of points) was pervasive across geographic space and was not significantly affected either by raw material or reutilization. A lower degree of reutilization of points is interpreted as a consequence of a non-utilitarian role of projectile points, which represented a critical component of Bell Beaker mortuary practices. 相似文献
53.
Luís Miguel Marado Ana Maria Silva 《Archaeological and Anthropological Sciences》2018,10(5):1165-1177
A reference sample of dental and oral nonmetric traits should represent its biological population from which it stems. The presence of individuals born at different times, different regions, and separate countries in the Coimbra-identified cranial collections provides the test of whether this sample reflects the biological continuity of this Portuguese sample among the late modern (early industrialization, nineteenth century) to early contemporary (early demographic transition, first half of the twentieth century) population of this region of central Portugal. The Coimbra collections were scored for 61 traits using methodology by Hauser and De Stefano (1989), Turner et al. (1991), Scott and Turner (1997), Irish (1998), and Marado and Silva (2016). The 600 individuals in the sample were divided by generation, region, and nationality. Their phenetic diversity was tested with principal component analysis and with the mean measure of divergence statistic. The proximity between the subsamples was generalized, and it mimicked previous genetic marker results. Some small subsamples hindered conclusions; nevertheless, this Coimbra sample is considered a reliable dental reference sample for the Portuguese late modern/early contemporary population. 相似文献
54.
María Isabel Mota-López Rafael Fort Mónica Álvarez de Buergo Antonio Pizzo Rubén Maderuelo-Sanz Juan Miguel Meneses-Rodríguez Duygu Ergenç 《Archaeological and Anthropological Sciences》2018,10(5):1007-1022
The aim of this work is to characterize the original concrete from Roman buildings for public spectacles, theatre and amphitheatre, from Emerita Augusta, Mérida, Spain. An advanced knowledge of the Roman concrete composition is required for a reliable restoration and preservation of these ancient monuments. The concrete was studied through mineralogical (optical polarized microscopy and X-ray diffraction) and petrophysical (bulk and real density, open porosity to water and Hg, mechanical strength and ultrasonic velocity) analyses. With this work, it is possible to fill the gap that exists in this field and the characterization of the materials used in the Roman concrete from these two buildings, never previously studied, despite the significance of this archaeological ensemble, declared a World Heritage Site by UNESCO in 1993. The results allowed us to determine the composition of the Roman concrete and to infer the provenance of the aggregates used in these monuments. 相似文献
55.
1866年《南部宅地法》为了解决美国黑人自由民的土地问题制定了相对有利的宅地申请条件。然而由于缺乏申请宅地以及从事农业生产的初始资本和其他借贷来源,美国联邦政府也没有在借贷方面为宅地申请者提供相应的扶持,绝大多数黑人自由民并没有利用《南部宅地法》提供的有利条件转变为独立的小农场主。这是1866年《南部宅地法》失败的深层次原因。 相似文献
56.
57.
Cristina Costa António Arêde Aníbal Costa Elsa Caetano Álvaro Cunha Filipe Magalhães 《International Journal of Architectural Heritage》2015,9(7):760-774
This article aims at presenting and discussing the strategies for updating the finite element numerical modeling of stone masonry arch bridges using operational modal analysis. The study comprehended three bridges: two old ones, the St. Lázaro and the Lagoncinha bridges, and a recently constructed bridge in Vila Fria, Portugal. Updating of the bridge models is performed by comparing the numerical and experimental modal parameters. Three-dimensional detailed numerical models are used to perform modal analysis of the bridges. Experimental modal identification of the bridges is based on the measurement of their acceleration responses during normal operation. The assigned material properties are also based on available results obtained from in situ and laboratory tests and on the results of visual inspection and historical research carried out for both old bridges. 相似文献
58.
Andreas Angourakis José Ignacio Santos José Manuel Galán Andrea L. Balbo 《Environmental Archaeology》2015,20(4):349-363
AbstractA consistent access to food is paramount for humans at individual and group level. Besides providing the basic nutritional needs, access to food defines social structures and has stimulated innovation in food procurement, processing and storage. We focus on the social aspects of food storage, namely the role of cooperation for the emergence and maintenance of common stocks. Cooperative food stocks are examined here as a type of common-pool resource, where appropriators must cooperate to avoid shortage (i.e. the tragedy of commons). ‘Food for all’ is an agent-based model in which agents face the social dilemma of whether or not to store in a cooperative stock, adapting their strategies through a simple reinforcement learning mechanism. The model provides insights on the evolution of cooperation in terms of storage efficiency and considering the presence of social norms that regulate reciprocity. For cooperative food storage to emerge and be maintained, a significant dependency on the stored food and some degree of external pressure are needed. In fact, cooperative food storage emerges as the best performing strategy when facing environmental stress. Likewise, an intermediate control over reciprocity favours cooperation for food storage, suggesting that concepts of closed reciprocity are precursors to cooperative stocks, while excess control over reciprocity is detrimental for such institution. 相似文献
59.
60.