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   217篇
  免费   7篇
  2021年   2篇
  2019年   3篇
  2018年   5篇
  2017年   2篇
  2016年   4篇
  2015年   4篇
  2014年   6篇
  2013年   79篇
  2012年   7篇
  2011年   7篇
  2010年   7篇
  2009年   4篇
  2007年   1篇
  2006年   1篇
  2005年   3篇
  2004年   2篇
  2003年   3篇
  2001年   4篇
  2000年   2篇
  1999年   3篇
  1998年   2篇
  1997年   4篇
  1996年   4篇
  1995年   3篇
  1994年   2篇
  1993年   1篇
  1992年   2篇
  1991年   2篇
  1990年   2篇
  1989年   2篇
  1988年   1篇
  1987年   1篇
  1986年   2篇
  1985年   2篇
  1984年   6篇
  1983年   1篇
  1982年   4篇
  1981年   3篇
  1980年   4篇
  1979年   2篇
  1978年   3篇
  1977年   2篇
  1976年   1篇
  1975年   3篇
  1974年   4篇
  1973年   1篇
  1972年   2篇
  1971年   3篇
  1969年   1篇
  1965年   2篇
排序方式: 共有224条查询结果,搜索用时 15 毫秒
41.
One of the main issues facing almost all European regional policy-makers is how to ensure a smooth adaptation of their industrial structure in the face of changing societal and technological parameters. In the case of the Belgian region Wallonia, industrial decline has particularly marked the economy during recent decades and the need to promote structural change has been a central preoccupation of national and, subsequently, regional governments. At the same time, the highly complex system of governance in Belgium renders the definition and application of a coherent regional industrial policy difficult. This paper explores the development of industrial policy in the Walloon region with particular attention to the period since 1990 and the pertinence of the instruments and delivery mechanisms with respect to the underlying structural issues facing the regional economy. The paper is divided into four sections: the first offers a historical profile of the industrial development of the Walloon economy and in particular identifies some of the factors which provoked a serious structural crisis. The section reviews the economic impact of the successive phases of rationalization and diversification which have taken place since the 1970s and discusses how the industrial strategies adopted by the business sector and supported by the regional government have influenced the speed of economic regeneration. The second section considers the complex federal system of government in Belgium and how it influences the freedom of action for regional industrial policy. The governance of the economy by the numerous public or semi-public institutions active in the field of industrial policy is a crucial issue. A critical review of the main initiatives, instruments and targets of industrial policy in Wallonia is offered in section three, while the paper concludes by contrasting the Walloon industrial policy with initiatives taken in the neighbouring area of South-West Flanders and ponders the issue of whether in the end the key factor arresting the development of Wallonia is the insufficient level of 'social capital'.  相似文献   
42.
43.
44.
Résumé Au Gabonca 2400–2300 BP, les dernières cultures néolithiques des savanes de la moyenne vallée de l'Ogooué, succombent face à une rapide expansion de populations porteuses de fer. Cet événement, identifié sur des critères céramologiques et des mesures radiométriques, paraît situer l'arrivée des premiers métallurgistes — probablement Bantu — sur les berges de l'Ogooué.
In the savannas of the middle stretches of the Ogooué valley in Gabon,ca 2400–2300 bp, the last neolithic cultures succombed to the rapid expansion of ironworking populations. This event, identified on ceramic criteria and radiocarbon dates, may represent the arrival of the first Bantu ironworkers on the banks of the Ogooué.
  相似文献   
45.
46.
Recently, the Maya site of Nakum has been the subject of intensive research by the Institute of Archaeology of the Jagiellonian University, Kraków, Poland. This work has significantly enriched our knowledge of the ancient Maya of northeastern Guatemala, especially during the so-called Terminal Preclassic or Protoclassic period (ca. 100 b.c.a.d. 300), when many Maya centers suffered decline. The Protoclassic covers the transitional moment between two important periods of Maya chronology, the Preclassic and Classic, but so far, the typical ceramic components of this phase have been found in only a handful of Maya sites. Our research indicates that Nakum underwent important building programs and stable cultural growth during the discussed period. Here we discuss evidence of architectural and cultural activity at Nakum during the Terminal Preclassic within a wider geographic context. Our research highlights the role that Nakum played within Maya geopolitics in northeastern Guatemala and also contributes to the understanding of socio-cultural processes that the Maya civilization was undergoing during the as-yet poorly understood Protoclassic period.  相似文献   
47.
48.
49.
50.
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