全文获取类型
收费全文 | 4315篇 |
免费 | 192篇 |
专业分类
4507篇 |
出版年
2023年 | 37篇 |
2020年 | 91篇 |
2019年 | 93篇 |
2018年 | 187篇 |
2017年 | 190篇 |
2016年 | 177篇 |
2015年 | 123篇 |
2014年 | 139篇 |
2013年 | 1302篇 |
2012年 | 113篇 |
2011年 | 121篇 |
2010年 | 100篇 |
2009年 | 93篇 |
2008年 | 102篇 |
2007年 | 69篇 |
2006年 | 65篇 |
2005年 | 49篇 |
2004年 | 49篇 |
2003年 | 34篇 |
2002年 | 47篇 |
2001年 | 55篇 |
2000年 | 33篇 |
1999年 | 49篇 |
1998年 | 26篇 |
1997年 | 36篇 |
1996年 | 28篇 |
1995年 | 23篇 |
1994年 | 38篇 |
1993年 | 34篇 |
1992年 | 35篇 |
1990年 | 32篇 |
1989年 | 30篇 |
1988年 | 30篇 |
1987年 | 36篇 |
1986年 | 32篇 |
1985年 | 34篇 |
1984年 | 52篇 |
1983年 | 54篇 |
1982年 | 49篇 |
1981年 | 39篇 |
1980年 | 34篇 |
1979年 | 41篇 |
1978年 | 42篇 |
1977年 | 30篇 |
1976年 | 32篇 |
1975年 | 34篇 |
1973年 | 27篇 |
1972年 | 31篇 |
1971年 | 22篇 |
1970年 | 33篇 |
排序方式: 共有4507条查询结果,搜索用时 15 毫秒
141.
Rafael M. Martínez Sánchez Juan Carlos Vera Rodríguez Leonor Peña-Chocarro Youssef Bokbot Guillem Pérez Jordà Salvador Pardo-Gordó 《African Archaeological Review》2018,35(3):417-442
The period comprising the end of the Early Neolithic and the Middle Neolithic, dated broadly within the fifth millennium cal BC, corresponds to an interval that remains largely unknown in the extreme north-western tip of Africa. This situation contrasts with that of the Early Neolithic, a period characterised by the earliest evidence of the diffusion of a productive economy, cultivated plants and domestic animals. The paucity of data for these later phases can be explained in part by the lack of secure contexts and sequences based on radiocarbon datings of short-lived samples. The current study presents the results of the excavations of El-Khil Caves B and C that yield materials allowing re-evaluation of the chronology of a type of ceramic known as Ashakar ware. The study also identifies two traditions in the northern Moroccan Middle Neolithic. The first is heir to the so-called Impressa Mediterranean ware and rooted in the Cardial Neolithic, while the second is characterised by roulette cord impressions, red slip and tunnel lugs and probably rooted in the region of the Sahara, and has no technological precedents in the study area. 相似文献
142.
143.
144.
145.
The architecture of the Iron Age II fortified settlement at Muweilah (Sharjah,United Arab Emirates) 下载免费PDF全文
Steven Karacic Marc Händel Emily Hammer Peter Magee 《Arabian Archaeology and Epigraphy》2018,29(1):27-54
Excavations at Muweilah have uncovered twelve buildings encircled by two pairs of walls and ditches. We have published preliminary studies of several buildings. Research has now progressed to a stage where it is possible to produce a more complete analysis of the architecture. In this report, we present a detailed discussion of the fortifications and each building with its installations. Our assessment of the architecture identified the repeated combination of three rooms in many of the buildings in the Central Area of Muweilah. Moreover, a detailed study of the fortifications revealed several means of accessing Building II, the columned hall, in the Western Area. These findings offer insights into the organisation of Iron Age II settlements in south‐eastern Arabia. 相似文献
146.
This paper aims to introduce a case study of Czechia in distribution of the EU funds and their spatial patterns. EU funds receive plenty attention from both European society and the scientific community. However, there is a lack of detailed evaluations of spatial and sectoral differentiation, which might bring a better understanding to the whole EU funds system. This paper attempts to fill this gap with a method of geographical differentiation analysis of the Czech operational programme Enterprise and Innovations 2007–15, which should increase the competitiveness of industry and develop services for commercial activities. Historically, subsidies often go to peripheral regions at the borderland with Slovakia and Poland, while regions along the borders with Germany and Austria receive only a low level of support. Jurisdictions of the major recipients from hi-tech sectors are mainly in the close vicinity of the largest cities (Praha, Brno), which are natural centres of high technologically demanding sectors, but a high share of high-tech subsidies goes to some peripheral districts as well. These findings can contribute not only to the academic discussion about contradictory developmental impacts of subsidies but to the all-European debate on the EU funds purposes as well. 相似文献
147.
Maria Rodó-de-Zárate Mireia Baylina 《Gender, place and culture : a journal of feminist geography》2018,25(4):547-553
This paper introduces a special themed section that arose from an International Conference on Feminist Geographies and Intersectionality: Places, Identities and Knowledges, held in 2016 at the Universitat Autònoma de Barcelona. Six scholars of Canada, France, Greece, New Zealand, United Kingdom and United States seek to deal in five short papers with the intersectional dynamics of power structures and the central role of place within them. Here we situate the developments of intersectionality in feminist geographies in relation to the role of place and space in constituting intersectional relations, the relevance of context for the development of intersectionality and the use of different methodologies for research on it. 相似文献
148.
Melissa M. González 《Journal of Latin American Cultural Studies (Travesia)》2018,27(2):135-155
Using the methods of textual analysis and in conversation with both Latin American cultural studies and queer studies, the essay examines the ways that Pedro Lemebel’s diverse body of work – ranging from live performances, fiction, non-fictional crónicas, and interviews – engages the limits of subversion in neoliberal times. On the one hand, Lemebel’s work has been routinely framed in terms of its subversion of gendered, sexual, and political norms. On the other hand, scholars and commentators have not deeply engaged the many ways that Lemebel’s own work comments on and represents the challenges of producing subversive cultural productions in a globalized, late capitalist environment in which subversion, including his own, can be undone precisely when it is most celebrated, valued, and commodified. Reading Lemebel’s commentaries and interviews as producing cultural criticism that complements his better-known crónicas’ and performances’ ideological narratives, the essay argues that Lemebel’s oeuvre repeatedly addresses the challenges of performing a delicate dance between resistance and co-optation, given his acknowledged inseparability from the market. Taking Lemebel as a model for this balancing act, the essay ultimately aims to reveal and critique some of the ways that we academics tend to read sexual dissidence as successful subversion without recognizing its complications and limits. 相似文献
149.
Iván Ruiz 《Journal of Latin American Cultural Studies (Travesia)》2018,27(2):215-229
This article examines a group of photographs bearing a strong violent content that were published in print and digital media as part of the coverage of the ‘war against drugs’ in Mexico: an armed conflict initiated by the central government in December 2006. This military action was the first step in a process of militarization affecting several states, in which an attempt was made to dismantle territorial pacts between cartels, to control the illegal traffic in drugs and, supposedly, to put an end to the use and production of drugs among the population. This war gave rise to one of the bloodiest episodes of contemporary Mexico in which drug cartels reproduced and invented new methods of torture that were used not only upon the gunmen of rival cartels but also on a significant number of civilians. In the coverage of these events, not all photojournalists reacted to this upsurge in violence in a ‘sensationalist’ manner; several set out to produce images from unusual points of view. In particular, I shall analyze how certain images represent violence in a tense relationship with artistic iconography, upsetting parameters of horror and beauty in the public sphere. 相似文献
150.
This paper presents the results from extensive parametric dynamic analyses of soil-structure systems that focus on the clear modification (increase or decrease) of the acceleration amplitude at the foundation with respect to the free-field, especially for squatty structures. Properties of the systems are selected such as to cover a wide range of meaningful geometries and materials for engineering practice. The results are presented in terms of weighted modification factors of the maximum foundation acceleration amplitude with reference to the corresponding maximum acceleration amplitude at free-field, for squatty and more slender structures. For the large majority of the studied systems, foundation acceleration decreases from the free-field by 10–15% on average. Nevertheless, acceleration demand at the foundation increases compared to the free-field, for 30% of squatty and for 15% of the more slender structures. Modification of the foundation acceleration amplitude is also correlated with the ratio of the predominant period of the input motion to the flexible-base system period. Finally, the findings of this study are compared with sparse available recorded data from the Seismic Hazard Harmonization in Europe database. 相似文献