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   2640篇
  免费   138篇
  2023年   26篇
  2022年   10篇
  2020年   72篇
  2019年   49篇
  2018年   128篇
  2017年   131篇
  2016年   133篇
  2015年   93篇
  2014年   73篇
  2013年   841篇
  2012年   97篇
  2011年   93篇
  2010年   95篇
  2009年   81篇
  2008年   61篇
  2007年   83篇
  2006年   87篇
  2005年   34篇
  2004年   38篇
  2003年   31篇
  2002年   31篇
  2001年   27篇
  2000年   17篇
  1999年   23篇
  1998年   27篇
  1997年   12篇
  1996年   14篇
  1995年   24篇
  1994年   16篇
  1993年   19篇
  1992年   19篇
  1991年   16篇
  1990年   15篇
  1989年   17篇
  1988年   19篇
  1987年   20篇
  1986年   18篇
  1985年   15篇
  1984年   11篇
  1983年   9篇
  1982年   12篇
  1981年   14篇
  1980年   14篇
  1979年   8篇
  1978年   8篇
  1976年   8篇
  1975年   8篇
  1972年   10篇
  1970年   7篇
  1969年   7篇
排序方式: 共有2778条查询结果,搜索用时 15 毫秒
101.
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   
102.
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   
103.
ABSTRACT

Teresa de Jesús (1515–1582) lives in a patriarchal society opposed to the intellectual and spiritual development of women, something that she will not only not accept but also fight against, claiming a series of rights (the right to life, to expression, to autonomy, to the free development of her abilities, to have an active role in the Church, to relate to God through prayer, etc.) in spite of the restrictions of censorship and the cloud of suspicion that hung over her for being a mystic, the founder of convents, and the daughter and granddaughter of a converso. Furthermore, Teresa, with her reforms, would present an alternative life for women, as her convents would be spaces for freedom and women's solidarity.  相似文献   
104.
This paper explores the effectiveness of policies ‘in’ attracting the foreign research and development (R&D) of multinational enterprises (MNEs) to specific countries in Europe. We develop a macroeconomic investigation covering 29 European countries during the period between 1990 and 2012 in order to address: (a) whether the provision of direct financial support for business R&D is effective for the attraction of foreign R&D; (b) whether direct support is more effective than indirect support for this purpose and (c) whether the link between direct financial support for business R&D and the foreign R&D of MNEs is conditioned by the context within which the support is provided. The results of the analysis show that, first, the provision of direct financial support is generally effective for the attraction of foreign R&D by MNEs. Second, direct support for business R&D is more effective for this purpose than indirect support. Third, the provision of direct financial support for business R&D yields greater returns in contexts that are more socio-economically suitable for knowledge-intensive, innovative activity.  相似文献   
105.
Within the debates about the socio-economic advantages of cohesive urban regions, several barriers to institutional integration are said to exist, especially when a metropolitan government is absent and integration relies on inter-municipal cooperation. Some barriers are associated with different urban region structures, such as the asymmetric power relations and sociocultural contrasts between municipalities in systems with dominant core cities, or the lack of a leading city to overcome fragmentation and provide a shared identity in polycentric urban regions (PURs). This paper investigates whether urban regions formed around second-tier cities, whose features depart from both dominant core and PUR models, are able to mitigate these barriers when pursuing integration strategies. The analysis relies on interviews with municipal leaders in three representative European case studies, examining how they perceive the barriers to inter-municipal relations in second-tier urban regions. The findings show that perceptions vary not only between regions, with the three cases following different trajectories of integration, but also within regions, according to the geographical and socio-economic context of municipalities and the legacy of past relations. In general, barriers to integration are not minimized without explicit efforts to rebalance power relations, approach political cultures, mobilize core city leadership and develop a metropolitan identity.  相似文献   
106.
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   
107.
Tooth pendants of European elk, Eurasian beaver and brown bear are the most common artefact type in graves at Late Mesolithic Yuzhniy Oleniy Ostrov on Lake Onega, northwestern Russia. In one burial of a 20-35-year-old woman, 18 fragments of wild boar tooth pendants from at least five individuals were found. Wild boar was not a regular part of local fauna in the Mesolithic, and if these wild boars were hunted locally, they were very unusual game. These wild boar tooth pendants may also represent imported goods that came to Onega from a more southern area via exchange. It is also possible that the woman was not local but came from a region where wild boars were abundant and common game for Mesolithic people.  相似文献   
108.
109.
110.
This paper describes environmental systems games developed for energy and water resource use designed to be adaptable from high school to undergraduate use. Two of the games are computer simulations with adjustable levels of difficulty that can be done in a computer lab or as a homework assignment. The third is a peer-to-peer roleplayer game designed for an immersive in-class simulation. For the energy and the peer-to-peer water games, we describe (1) the overall strategy or story line adopted, (2) the manner in which the game is played by students in a classroom setting, (3) the use of scientific literature in conceptualizing and parameterizing the game, and (4) possible game extensions. Preliminary data from use at the undergraduate level shows that the games are very well-received by students and, consistent with other research on quasi-experimental simulations, likely enhance learning outcomes.  相似文献   
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