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   2808篇
  免费   155篇
  2023年   33篇
  2022年   13篇
  2021年   14篇
  2020年   65篇
  2019年   89篇
  2018年   169篇
  2017年   165篇
  2016年   149篇
  2015年   115篇
  2014年   103篇
  2013年   686篇
  2012年   95篇
  2011年   100篇
  2010年   92篇
  2009年   81篇
  2008年   79篇
  2007年   64篇
  2006年   58篇
  2005年   44篇
  2004年   43篇
  2003年   40篇
  2002年   52篇
  2001年   43篇
  2000年   41篇
  1999年   29篇
  1998年   35篇
  1997年   31篇
  1996年   27篇
  1995年   24篇
  1994年   20篇
  1993年   17篇
  1992年   18篇
  1991年   11篇
  1990年   11篇
  1989年   19篇
  1988年   10篇
  1987年   12篇
  1986年   13篇
  1985年   17篇
  1984年   23篇
  1983年   22篇
  1982年   22篇
  1981年   14篇
  1980年   19篇
  1979年   18篇
  1978年   18篇
  1977年   12篇
  1976年   14篇
  1975年   13篇
  1971年   9篇
排序方式: 共有2963条查询结果,搜索用时 15 毫秒
151.
Teaching of critical spatial thinking in higher education empowers graduates to effectively engage with spatial data. Geographic information systems (GIS) and science are taught to undergraduates across many disciplines; we evaluate how this contributes to critical spatial thinking. The discipline of GIS covers the whole process of spatial decision-making, but GIS modules often ignore the context setting of spatial problems, and just cover the technical aspects of how to use GIS software. We outline how some existing GIS practicals could be improved to focus on the development of critical spatial thinking skills, competences and abilities that are valuable to graduates.  相似文献   
152.
Research projects undertaken in the Cantabrian region since 1980 have produced new, high-quality information about the neolithisation process(es) in this area. It is now necessary to review this archaeological information and test the main hypotheses put forward to explain it. This paper presents an update on the archaeological evidence (sites, chronological dates, archaeozoological, archaeobotanical and technological information) for the early Neolithic in the Cantabrian region. It summarizes recent research on neolithisation in the region, and assesses the impact of this process during the early Neolithic, and its later consolidation. Although the available information is still incomplete, it is now possible to identify the focal point of the introduction of elements characteristic of the Neolithic way of life in the region. Current evidence suggests that it is in the eastern sector, where the earliest arrival of domesticates and new technologies such as pottery has been attested. The existence of continuities—such as sustained reliance on hunting and gathering and the coexistence of old and new funerary rites—suggests the persistence of native populations, which gradually participated in the neolithisation process after an ‘availability phase’.  相似文献   
153.
Abstract

This article will analyse, from a transnational history point of view, the actions of Spanish anarchists in France from 1945 onwards, especially the relationships and the projects that they developed with French anarchists. Moreover, it will study the difficulties of integration faced by the Spanish libertarian colony in France, the links built with their French comrades and the different actions carried out in the domains of trade unionism, culture, leisure and the armed struggle.  相似文献   
154.
In recent decades in Europe, municipalities have promoted many poorly qualified and widespread industrial parks. These policies have caused various problems such as oversupply of industrial land, obsolescence and high vacancy rates. The future of these sites is uncertain and has become a key issue in planning. Nowadays, policies are focused on upgrading these sites and on implementing regional coordinated practices. This paper describes a methodological approach to identifying a subregional network of industrial parks in the Ave valley, Portugal. The network is based on the parks’ attractiveness and has the purpose of supporting planning policies in terms of upgrading and providing new sites. The approach was based on a multi-criteria analysis whereby the parks were ranked according to their attractiveness considering their coverage in terms of infrastructures, services and accessibility. Results show that the majority of the existing and planned parks, even if upgraded, will not be very attractive and will be limited to a municipal scale due to structural problems related to their location and poor coverage. Moreover, the paper also discusses the challenges in implementing this planning approach at a subregional level. Despite the specificities of the case study, this methodology could be adopted in similar studies.  相似文献   
155.
156.
This article explores the strategic use of literary form in the Mexican writings of José Zorrilla. The article focuses on México y los mexicanos (1856), a letter Zorrilla wrote to his fellow Spanish Romantic playwright, Ángel de Saavedra, the Duke of Rivas. Zorrilla’s México y los mexicanos is a rare piece of epistolary writing in Spanish Romanticism as well as one of the first literary histories of Mexico. Often overlooked in the letter, however, is Zorrilla’s economic critique of the precarious condition of artists in both Mexico and Spain. A conservative moderado, Zorrilla could not air his concerns publicly without the threat of retribution from his fellow conservative colleagues in Spain. Zorrilla thus used the epistolary form, the article argues, in order to surreptitiously introduce the economic plight of artists into mainstream Spanish as well as Mexican political discourse. Read in this context, Zorrilla’s letter makes visible the fundamental role a transatlantic Romantic vision of labour played in shaping nineteenth-century political discourse in both the Iberian Peninsula and Latin America.  相似文献   
157.
During the excavation carried out at the outskirts of Hajdúböszörmény (NE-Hungary) in 2011, the remains of a 12–13th century settlement were brought to light. Linguistic and historical research has previously presumed that one of the main centres of medieval Hungary’s Muslim (Ishmaelites) population is located in the northern-eastern part of the Great Hungarian Plain. At Hajdúböszörmény–Téglagyár ‘2’ archaeological site several household units were systematically sampled for archaeobotanical analysis. The recovered ceramics differ from the known ceramic production of the Árpád Age, whereas significant differences were detected in the zooarchaeological assemblage, too. The archaeobotanical record, representing 23 features, consists of 2679 items of charred macro-botanical remains that belong to 54 taxa. The record is predominated by the presence of cereals among which rye (Secale cereale L. subsp. cereale) and common barley (Hordeum vulgare L.) are the most frequent. Besides the dominance of cereals, pulses and vegetables, as well as gathered fruit remains were identified. By the comparison of results to other Árpád Age sites, we assume that the revealed ethno-archaeobotanical information identifies a population that used similar plant resources, but in a different way and strategy than the known Christian population of the Carpathian Basin.  相似文献   
158.
Controlled rocking heavy timber walls are designed to rock on their foundations in response to earthquakes. For regions of moderate seismicity, it is proposed that this rocking behaviour can be adequately controlled using only post-tensioning, even with a large force-reduction factor and no supplemental energy dissipation. This article presents a force-based design procedure for controlled rocking cross-laminated timber walls without supplemental energy dissipation, including a method for estimating higher mode effects. Fragility analyses of three prototype walls demonstrate that the procedure can limit the probability of collapse to <10% during a maximum considered earthquake in a region of moderate seismicity.  相似文献   
159.
160.
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