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   229篇
  免费   13篇
  2024年   1篇
  2023年   2篇
  2022年   1篇
  2021年   2篇
  2020年   1篇
  2019年   13篇
  2018年   20篇
  2017年   13篇
  2016年   22篇
  2015年   14篇
  2014年   10篇
  2013年   48篇
  2012年   18篇
  2011年   10篇
  2010年   10篇
  2009年   13篇
  2008年   10篇
  2007年   7篇
  2006年   2篇
  2005年   4篇
  2004年   1篇
  2003年   1篇
  2002年   3篇
  2001年   1篇
  2000年   1篇
  1999年   2篇
  1998年   3篇
  1997年   1篇
  1996年   3篇
  1995年   2篇
  1993年   1篇
  1978年   1篇
  1975年   1篇
排序方式: 共有242条查询结果,搜索用时 218 毫秒
51.
Summary

This article reconstructs the personal and intellectual friendship between two cosmopolitan intellectuals: Andrea Caffi (1887–1955) and Nicola Chiaromonte (1905–1972), who met while in exile in Paris in 1932. After a brief recapitulation of their previous biographies, and an overall presentation of their participation in the revolutionary antifascist group ‘Giustizia e Libertà’ (GL) in the thirties, this article provides a detailed analysis of their dialogues and disagreements in the forties and fifties on the topics of socialism and revolution, antifascism and anti-totalitarianism, utopia and history. Particular attention is devoted to their contribution to the debates in the antifascist journal of GL (published in Paris, 1932–1935) and in the radical journal of Politics (published in New York, 1944–1950). Examined closely, the friendship between Caffi and Chiaromonte appears as a sequence of convergences and divergences, understandings and ruptures, which reflect the tensions and lacerations of the European civil war and its post-war legacy (intertwined with and overlapping the cultural Cold War). Looked at again from a distance, however, it reveals a fundamental intellectual unity—a profound apolitical affinity in a century of radical politics which had fed wars, revolutions and totalitarian regimes.  相似文献   
52.
During the years following national unification, the Mezzogiorno became one of the greatest problems for the Italian government. On the one hand, because of its social and economic backwardness and the loyalty of some sections of the population to the previous illiberal government, it was devalued by the national political and military elite as a part of the large and undeveloped ‘South’ of the world, which was at that time affected by the criticism of ‘orientalistic’ Western discourse. On the other hand, it was also the place where the democratic and progressive opposition to the moderate liberal national rulers was stronger. A transnational and transregional perspective shows how the Mezzogiorno contained two different coexisting nations, a reactionary and a progressive one, which were in mutual conflict and, at the same time, on different grounds, in conflict with the central State. Building the state in the South meant, for the Italian liberal elites, discovering an ambiguous and dangerous periphery of the Nation.  相似文献   
53.
In this article, we compare the relative efficiency of different forecasting methods of space‐time series when variables are spatially and temporally correlated. We consider two cases: (1) univariate forecasting (i.e., a space‐time series aggregated into a single time series) and (2) the more general instance of multivariate forecasting (i.e., a space‐time series aggregated into a coarser spatial partition). We extend the results in the literature by including the consideration of larger datasets and the treatment of edge effects and of negative spatial correlation. We first introduce a statistical framework based on the space‐time autoregressive class of random field models, which constitutes the basis of our simulation study, and we present the various alternative forecasting methods considered in the simulation. We then present the results of a Monte Carlo study related to univariate forecasting. In order to allow a comparison with the findings of Giacomini and Granger (2004), we consider the same forecasting strategies and the same combinations of the parameter values used there, but with a larger parametric set. Finally, we extend our analysis to the case of multivariate forecasting. The outcomes obtained provide operational suggestions about how to choose between alternative forecasting methods in empirical circumstances.  相似文献   
54.
Identifying tools by means of morphological attributes are widely used in lithic studies to categorize retouched artifacts from different archaeological periods. This procedure has facilitated the exchange of information between separate researchers and has improved the comparison of different assemblages. In these classifications, denticulates and notched tools have been regularly interpreted as analogues and chronologically unvaried in different and vast territories. Based on the definitions developed by Bordes, the denticulate category has become a catchall for any kind of tool bearing concavities. In this paper a new quantitative approach to the classification of denticulates and notched tools is proposed. The new methodology is based on measuring the length of notches and their distribution on the perimeter of the blank. Analyzing the lithic series of the Abric Romaní rock-shelter (Spain) and Grotta Maggiore di San Bernardino (Italy) led to the identification of 11 redundant forms: eight denticulates and three notched tools. Moreover, the application of Kuhn’s Geometric Index of Unifacial Reduction brought local manufacturing trends to light, calling into question the presumed geographical uniformity of these categories of artifacts.  相似文献   
55.
Knowledge of the embalming methods used in Renaissance Italy comes not only from the literary texts of physicians and surgeons of that period, but also from artificial mummies which have been found. In 1999 two mummified bodies, dated back to the end of 15th and beginning of the 16th century, were recovered in a crypt of the hospital chapel of Santa Maria della Scala in Siena (central Italy). The individuals were identified as Salimbene Capacci (1433–1497), Rector of the hospital, and his wife, Margherita Sozzini (?-1511). The mummies were submitted to autopsy and paleopathological examination, which included Computed Tomography. Palaeobotanical and palynological analyses were performed on the vegetable materials and plants used to fill the body cavities. This study was carried out with a multidisciplinary perspective, that allowed us to reconstruct the embalming techniques and substances used for mummification. The results are compared with the evidences provided by other mummies and embalming handbooks of that time.  相似文献   
56.
Airports are no longer only places for take-off and landing, but increasingly became economic nodes in the urban development of metropolitan areas. Though it is debatable to what extent aviation growth is a cause or effect of economic growth, the reciprocal relationship cannot be denied. Most past developments near airports have been spontaneous and haphazard, but recently regional planners have increasingly included an airport focus. Airport planning aims to find a balance between exploitation of the economic potential and protecting the airport area from congestion and urbanization. This article examines the effects of land-use restriction policies near Amsterdam Airport Schiphol. Within the Schiphol area, only airport-related companies are allowed to establish their business near the airport. These policies have been implemented since 1987, but their success or failure was never evaluated in depth. For the first time empirical results show that land-use restriction policies could ban most of the undesired businesses near the airport. However, despite varieties of implementation and interpretation of the testing, few differences in effects are found. This study shows that airport-relatedness testing is a typically Dutch planning instrument, but can also be useful for other international airports.  相似文献   
57.
58.
Our study explores research avenues that can help policymakers to assess regional capabilities for ‘green’ economic restructuring. After reviewing the relevant literature, and envisioning research paths which consider both market transactions and externalities, we propose possible ways to translate past research findings into novel statistical tools. Our point of departure is the ‘skill relatedness’ among economic sectors in Norway, as inferred from intersectoral labour flows (years 2008–2014). Then, on the basis of the industrial composition in each of the 161 Norwegian labour market areas, candidate regions that could benefit the most from a ‘green’ restructuring policy, aimed at photovoltaics in our empirical example, are brought forward.  相似文献   
59.
The term “millets” is used to identify several genera of grasses (Poaceae), most of which belong to the subfamily Panicoideae. Millets are one of the major food sources in arid and semi-arid areas of the world and they have been important crops in the prehistory of Africa and Eurasia. In this paper, we discuss phytoliths and starch grains from two of the less studied major millets (Pennisetum glaucum and Sorghum bicolor) as well as from some small millet species that are not normally considered of much importance (so-called forgotten millets: Digitaria ciliaris, Echinochloa colona, Echinochloa frumentacea, Brachiaria ramosa, Setaria pumila and Setaria verticillata). The preliminary results of this study on phytolith morphology, both at single and joined (silica skeletons) morphotypes, and starch grains show great potentials for the identification of different genus or species on the basis of microremains.  相似文献   
60.
Several authors agree that stone surface consolidation works should not significantly alter original mechanical and hygrometric properties of the stones in order to avoid differential stress between the consolidated and non-consolidated parts. Specific limitedly destructive methodologies have been developed for assessing the variation in both mechanical and hygrometric properties, but they require preliminary calibration procedures that are very costly to adopt in terms of both time and money. This research study describes an analytical and experimental procedure aimed at obtaining the necessary hygrometric and mechanical characterization of natural and/or artificial stone, before and after consolidation works, by simply assessing the variation in the distribution of the porous structure.  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