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   334篇
  免费   19篇
  2024年   1篇
  2023年   8篇
  2022年   2篇
  2021年   2篇
  2020年   12篇
  2019年   18篇
  2018年   40篇
  2017年   39篇
  2016年   26篇
  2015年   17篇
  2014年   20篇
  2013年   85篇
  2012年   6篇
  2011年   4篇
  2010年   10篇
  2009年   8篇
  2008年   9篇
  2007年   3篇
  2006年   3篇
  2005年   1篇
  2004年   1篇
  2001年   2篇
  2000年   2篇
  1999年   2篇
  1998年   6篇
  1997年   1篇
  1996年   4篇
  1995年   3篇
  1993年   2篇
  1992年   2篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1987年   3篇
  1986年   1篇
  1985年   1篇
  1982年   1篇
  1981年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1957年   1篇
排序方式: 共有353条查询结果,搜索用时 15 毫秒
21.
It is proposed that there is an iconographic and epistemological relationship between some drawings in Felipe Guaman Poma de Ayala’s Nueva corónica y buen gobierno and the images recorded in several colonial wood vessels (qeros) which circulated widely during the time that Guaman Poma was writing his letter to the King of Spain. This connection shows that the work of Guaman Poma was not an isolated or singular act in the colonial context and that both communicative and creative processes, that of the Nueva corónica and that of the qeros, formed part of a process of shared colonial semiosis through which Andean societies maintained a certain autonomy in the production and circulation of their own discourses. Secondly, the article discusses the epistemological tension that results from the coexistence of different narratives (European and Andean) that used their own temporal and spatial categories to account for new colonial conditions.  相似文献   
22.
Few men arguably shaped the trajectory of American foreign policy in the twentieth century as durably and profoundly as Henry L. Stimson. After all, Stimson was not only directly involved in many consequential decisions dealing with highly important matters of war and peace, but was also a major influence in the United States’ more proactive involvement in extra-territorial affairs. For Stimson, it was simply wishful thinking to presume that the United States could forever disengage itself from far-reaching occurrences in other parts of the globe. Accordingly, he thought it just as critical to anticipate international problems as it was to successfully resolve them afterwards, with the result that he became an ardent and early proponent of a much more sophisticated global strategy after the Second World War. In that context, however, most historians have primarily focused on Stimson's role in the development and use of the atomic bomb against Imperial Japan, though arguably less on his more sweeping grand strategic designs. Consequently, the present article will attempt to offer a more comprehensive analysis of Stimson's grand strategic designs, particularly as they related to his vision and reflections on the necessary ingredients of a more peaceful, stable and secure interstate system.  相似文献   
23.
This article analyses the evolution of Community expenditure, on the basis of the data given in the budget and in the EDF, from the origin of the process in 1957 until the year 2002, the last definitive figures. The technique of principal component factor analysis has been applied to these variables. The basic objective of this study is to detect the interrelationships among the policies of the Union and to effect a classification of them, in order to detect the priorities of the European project and to estimate the dimension of the impact of its policies during the period.  相似文献   
24.
Comparative policy studies face a number of methodological challenges where conceptualization of the object of comparison—policy output—is the most fundamental. On the basis of three common approaches of the study of policy output, we reconsider this widely applied concept and propose a refined measure as a function of both density (number of policy instruments) and intensity (content of policy instruments). We theoretically derive six policy‐intensity measures (objectives, scope, integration, budget, implementation, and monitoring), which are used for weighting national policy instruments on an Index of Climate Policy Activity. The article presents an empirical application of this measurement approach. Focusing on national climate policy instruments in the energy production sector in Austria, Germany, and the United Kingdom, we investigate changes in the countries' policy portfolios from 1998 to 2010. The article demonstrates that our Index of Climate Policy Activity provides a reliable and valid measurement for national policy output that can be applied for comparative analyses of policy output.  相似文献   
25.
We analyse the isotopic values (δ13C, δ15N) of the diet of pre-Columbian horticulturalist populations from tropical and subtropical areas of southeastern South America, belonging to the Guarani and Taquara archaeological units. The data indicate different trends in each one (T?=?4.21; P?=?0.0004), showing a mixed diet with maize consumption in the Guarani samples (δ13Cco?=??15.5?±?1.8‰; δ13Cap ?10.4?±?0.8‰) and a depleted one in the Taquara ones (δ13Cco ?18.2?±?1.7‰; δ13Cap ?11.9?±?0.9‰), with a significant internal dispersion in both populations. The first population has higher nitrogen values (δ15N 11.1?±?0.6‰) compared to the Taquara samples (δ15N 9.3?±?1‰), suggesting a more carnivorous diet. The recognition of these pre-Columbian mixed diets involves the identification of maize cultivation on the Atlantic side of the southernmost area of South America (Parana Delta, 34° SL). Through the analysis of δ18O we have identified two isotopic ecozones, the first along the Paraná River Valley, with an average value of δ18O ?3.7?±?0.5‰ (CV?=?13.5%; CI?=??3.83 / ?3.16), and the second one, located in the Planalto of southern Brazil (Araucaria Forest), with a mean value of δ18O ?1.5?±?0.3‰ (CV?=?16.5%; CI?=??1.69 / ?1.29). The isotopic data (δ13C, δ15N and δ18O) suggest human movements between these two ecozones.  相似文献   
26.
27.
This article aims at assessing the role of related variety, that is, the relatedness of knowledge bases used by different sectors within a region, as a major driver of clusters’ development. Some recent theoretical papers underline the role of clusters as ‘knowledge platforms’ organizing the recombination of technologies in overlapping industries, following the seminal definition of clusters by Porter as ‘geographic concentrations of linked industries’. In order to investigate the role of related variety in cluster dynamics, we analyse the patterns of development of clusters specializing in photonics in Europe. Photonics constitutes a new and rapidly evolving set of technologies with a high expected degree of technological recombination. However, due to inadequate traditional sectoral classifications, we propose an original method to delineate the perimeter of photonics in patent databases. A two-step algorithm is then used to identify systematically photonic clusters in Western Europe at the local level. In the last part of the paper, a typology of technological trajectories of clusters over the last decades is developed and then correlated with a set of quantitative measures of technological relatedness. The results highly confirm the role of related variety as a major driver of success, particularly for the biggest European clusters.  相似文献   
28.
There has been noticeable development in the protection of linear infrastructure by UNESCO, whether on its cultural, technological or historical merits. However, with the exception of other means of transport incorporated within the field of industrial archaeology or recognised by the CIIC under the category of cultural routes, little or no consideration has been given to roads built from the mid-eighteenth century to the early part of the twentieth century. In view of this situation, this paper has the following aims. Firstly, to define the concept of ‘modern road’ and provide a brief analysis of the historical development and current situation of the same. Secondly, to assess the main contributions made to date regarding the heritage dimension of modern roads. Thirdly, to reconstruct the process of defining linear cultural landscapes, historic transportation corridors, cultural routes and heritage canals, railways and roads, in accordance with the considerations raised by ICOMOS and UNESCO. Finally, to contribute to the debate on the definition, characterisation and assessment of modern roads as world heritage assets, both intrinsically and in relation to established heritage categories.  相似文献   
29.
30.
ABSTRACT

The concept of topoiesis of textual space addresses an analysis of the spatial elements that tend to provide a meaning to the literary text. Based on textual semiotics where there is an organized relational system of meanings, in this article we propose that it is possible to determine the function of space as a meaning issue from three different literary text instances (event or motive; character; and object). This distinction will permit a deeper interpretation of the sense of space in the literary text.  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