全文获取类型
| 收费全文 | 1889篇 |
| 免费 | 11篇 |
专业分类
| 1900篇 |
出版年
| 2024年 | 6篇 |
| 2023年 | 6篇 |
| 2022年 | 4篇 |
| 2021年 | 8篇 |
| 2020年 | 12篇 |
| 2019年 | 27篇 |
| 2018年 | 291篇 |
| 2017年 | 231篇 |
| 2016年 | 259篇 |
| 2015年 | 42篇 |
| 2014年 | 21篇 |
| 2013年 | 100篇 |
| 2012年 | 48篇 |
| 2011年 | 178篇 |
| 2010年 | 190篇 |
| 2009年 | 56篇 |
| 2008年 | 87篇 |
| 2007年 | 79篇 |
| 2006年 | 6篇 |
| 2005年 | 37篇 |
| 2004年 | 16篇 |
| 2003年 | 11篇 |
| 2002年 | 6篇 |
| 2001年 | 8篇 |
| 2000年 | 11篇 |
| 1999年 | 6篇 |
| 1998年 | 4篇 |
| 1997年 | 6篇 |
| 1996年 | 6篇 |
| 1995年 | 10篇 |
| 1993年 | 9篇 |
| 1992年 | 5篇 |
| 1991年 | 4篇 |
| 1990年 | 4篇 |
| 1986年 | 4篇 |
| 1977年 | 9篇 |
| 1976年 | 5篇 |
| 1975年 | 4篇 |
| 1972年 | 5篇 |
| 1971年 | 6篇 |
| 1970年 | 4篇 |
| 1969年 | 5篇 |
| 1968年 | 5篇 |
| 1967年 | 4篇 |
| 1966年 | 4篇 |
| 1964年 | 3篇 |
| 1961年 | 3篇 |
| 1960年 | 3篇 |
| 1959年 | 4篇 |
| 1950年 | 3篇 |
排序方式： 共有1900条查询结果，搜索用时 15 毫秒
91.
In 1918, the Dutch government decided to enclose and reclaim the Zuider Zee (later called the IJsselmeer). The preceding decades had been marked by broad public debate about the utility and urgency of the project. Around 1900, its proponents constructed images of the region and of the Dutch nation in which the Zuider Zee was no longer a crossroads. They emphasized the backwardness of the area and depicted the sea as a domestic enemy, its violent storms posing a threat to the nation. Cornelis Lely’s Zuider Zee proposal (1891) promised a bright future for both the region and the Netherlands as a whole. The struggle against the water would revitalize the nation (by stimulating nation-building) and modernize its international image (perceived as a picturesque but archaic country). Opponents of the project feared the high costs and developed a counter-image: the Zuider Zee region as heartland of ‘authentic’ Dutch culture, a heritage that would be jeopardized by the project. The article concludes by highlighting the synchronicity of the non-synchronous: the Zuider Zee region was envisioned as a region living in the past, thereby constituting an ‘internal Other’ in a country undergoing rapid modernization around 1900. 相似文献
92.
Evangelos Tsakalos Constantin Athanassas Polychronis Tsipas Maria Triantaphyllou Maria Geraga George Papatheodorou Eleni Filippaki John Christodoulakis Maria Kazantzaki 《Archaeological and Anthropological Sciences》2018,10(1):41-60
Quaternary stratigraphy and sea level changes have been extensively investigated in many areas of the Mediterranean. However, numerical dating of coastal deposits and the associated paleoenvironmental information are limited for the coasts of Cyprus, principally based on radiometric and radiation-exposure geochronological techniques on fossils which bear a range of limitations and uncertainties. As such, optically stimulated luminescence (OSL) dating techniques are deemed to be the most suitable in direct dating of the coastal sediments of Cyprus. In the southeastern Cyprus, coastal dunes (aeolianites) now forming elongated ridges appear as morphological features running parallel to the current shoreline presenting an indicator of sea level and climate changes of great paleoenvironmental significance. We present our first chronological results for the exposed aeolianites and underlying littoral deposits formed along the southeastern coastal Cyprus ranging from 78.4 ± 9.9 to 56.2 ± 7.4 ka. The post-infrared–infrared stimulated luminescence (pIR-IRSL) revealed that dune formation took place during the marine isotope stages (MISs) 3, 4, and possibly 5a. Late Holocene reworking is proposed for a distinctively isolated dune with an age of ~1.3 ka ago. This study also showed that pIR-IRSL dating of feldspars may be a reliable alternative to quartz OSL dating when the quartz luminescence characteristics are unsuitable. 相似文献
93.
94.
Marcia Siqueira Rapini Tulio Chiarini Alexandre de Queiroz Stein 《Journal of regional science》2024,64(1):108-135
The purpose of this paper is to spatially and regionally examine academic engagement within Brazil, identifying patterns. Moreover, our investigation can contribute to a better understanding of how knowledge can be turned into a tool to fight regional inequality. We depart from two hypotheses: first, universities situated in peripheral regions interact more with companies from relatively more dynamic regions, and second, in the absence of industrial knowledge demand, universities tend to collaborate more closely with a diverse range of stakeholders in the region. To evaluate these hypotheses and find empirical evidence, we consider 4497 research groups and 4603 nonacademic organizations as “nodes” connected by 8830 collaborations throughout all Brazilian regions. Social network tools are used to illustrate the spatial and regional dimensions of academic engagement more accurately. The results show that academic engagement is not regionally homogeneous, demonstrating essential differences regarding local nonacademic partnerships. Innovation policies, which encourage only university–firm interactions, perpetuate regional inequality. 相似文献
95.
Elise Mank Hans H. de Boer Judith M. Versluis Roelof-Jan Oostra Alie E. van der Merwe 《International Journal of Osteoarchaeology》2023,33(1):128-135
Microcephaly, characterized by crania with an abnormally small occipitofrontal circumference (OFC), is only sporadically described in paleopathological literature. Accurate identification of individuals suffering from microcephaly is challenging when performed in an archeological context, especially in mild cases, as appropriate reference data are often not available. This study aimed to describe the craniometric characteristics of the Meerenberg (MeB) skeletal collection and to identify microcephalic individuals while focusing on the diagnostic criteria and the influence of reference data on the prevalence of the condition. The value of virtual endocasts as a diagnostic tool was also assessed. Forty-eight adults (1891–1936) excavated from the cemetery of the MeB psychiatric hospital (Bloemendaal, The Netherlands) were investigated. Microcephalic individuals were identified by using the craniometric characteristics of a contemporary Dutch archeological population as reference. In order to investigate the usefulness of modern clinical head circumference reference data on the diagnostic process, cranial OFCs of the MeB individuals were converted to head OFCs. Virtual endocasts were created from the identified microcephalics and three normocephalics. Three MeB females (all <−3 SD) were identified as microcephalic when compared with a sex-matched contemporary archeological reference sample. The same three MeB females were classified as microcephalic when using sex-matched modern clinical reference data and when applying −3 SD of the pooled sex archeological craniometric reference data as cut-off point. No individuals were classified as microcephalic based on the metric characteristics of the virtual endocasts. Microcephaly can only be accurately identified when using sex-matched contemporary population reference data, or in its absence, modern clinical data after soft tissue correction. Should sex estimation be unreliable, a –3 SD cut-off point generated using pooled sex reference data seems suitable as diagnostic tool. Virtual endocast did not support the identification of microcephaly in this study. 相似文献
96.
Sara L. Juengst Jos M. Capriles Daniela Velasco Arzabe Sergio Calla Maldonado 《International Journal of Osteoarchaeology》2019,29(1):149-154
Trepanation has been practised in the Andes since 400–200 B.C.E., with numerous examples documented across Peru and Northern Bolivia (Tello, 1913 ; Verano, 2016 ). This practice appears to have been widespread across these areas; however, other parts of the Andes, such as Northwest Argentina, Chile, and Southern Bolivia, have not yet produced examples of cranial surgery, with the exception of one possible example from Northwest Argentina (Seldes & Botta, 2014 ). We present evidence for trepanation from a ca. 650 cal. C.E. burial from a salvage excavation near Tarija, Bolivia. We found that this probable male, adult individual had two blunt force traumatic lesions on the cranium. In addition, there was a rounded perforation on the right posterior skull that showed external bevelling and rounded edges consistent with a healed trepanation. We suggest that this case implies that trepanation was more widely practised than previously understood. Additionally, the correlation between trepanation and blunt force trauma suggests that this surgery was likely performed as a medical procedure, rather than for strictly ritual purposes. Thus, this is an important contribution to the broadening literature on pre‐Hispanic trepanation. 相似文献
97.
Bart Sleutjes Jeroen Ooijevaar Helga A.G. de Valk 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2019,110(3):359-377
This paper studies residential segregation in the Amsterdam Metropolitan Area and makes three contributions to the recent debates on segregation. First, both ethnic and socio‐economic segregation are studied by comparing isolation index scores for both individual indicators and their interactions. Second, neighbourhoods are defined as scalable individualised units, which allows for comparisons across spatial scales. Third, the paper adopts a longitudinal approach by covering three different time points, which enables us to get a grip on segregation trends. The results indicate that there are notable differences in segregation levels and trends between the applied segregation indicators. Ethnic segregation remained largely stable over the 2003–14 period, whereas the indicators of socio‐economic segregation have slightly changed, but all in different directions. Only for tertiary education segregation has increased over the entire period. The Dutch welfare system, the well‐dispersed and socially‐mixed social housing sector and gentrification help to explain these developments. 相似文献
98.
Angela Santamaria Daniela García Fallon Hernández Andrés Pardo 《Gender, place and culture : a journal of feminist geography》2019,26(2):227-250
This article presents the life stories of six indigenous women from the Amazonian region, who coordinate local women processes through indigenous organizations and networks. Since the political and legal visibility of violence against indigenous women in Colombia is weak and limited, we aim to analyze their experiences from an intersectional perspective. For this purpose, we employed multiple methodologies, including body mapping and social cartography. Thus, by reconstructing their experiences and attempts to make visible violence against them, we could perceive some of its multiple modalities, which are quickly captured by the great category. 相似文献
99.
This paper investigates the interplay between cultural traditions and policy effectiveness. It explores the differential impact of a large development program (Cassa per il Mezzogiorno), implemented for four decades, starting in the 1950s, to stimulate convergence between Italy's south and the more developed north, on municipalities with different histories. Namely, we consider a sample of municipalities located on either side of the historical border of the Kingdom of the Two Sicilies, whose legacy is considered, from Putnam onwards, to be a prime‐facie cause of Southern Italy's underdevelopment. Having been part of the Kingdom of the Two Sicilies is associated with a negative impact of development policies, but only when the allocation of development funds through the Cassa per il Mezzogiorno suffered from low quality of governance and was driven by political considerations rather than by efficiency ones. 相似文献
100.
This paper measures the impact of wage zones—compulsory wage differentials at the province level—on Italy's local labor markets during the 1950s. Using spatial regression techniques, it finds that for the industrial sectors covered under wage zones there was an increase in employment when one crossed the border from a high‐wage province into a low‐wage one; the effect diminished, however, as the distance from the boundary increased. The paper also illustrates that the impact on the overall (nonfarm) private sector, which includes both covered and uncovered sectors, was negligible. 相似文献