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   1971篇
  免费   328篇
  2024年   3篇
  2023年   22篇
  2022年   3篇
  2021年   24篇
  2020年   47篇
  2019年   135篇
  2018年   163篇
  2017年   137篇
  2016年   177篇
  2015年   127篇
  2014年   118篇
  2013年   417篇
  2012年   119篇
  2011年   116篇
  2010年   86篇
  2009年   67篇
  2008年   82篇
  2007年   79篇
  2006年   48篇
  2005年   22篇
  2004年   38篇
  2003年   33篇
  2002年   26篇
  2001年   32篇
  2000年   34篇
  1999年   4篇
  1998年   18篇
  1997年   20篇
  1996年   14篇
  1995年   16篇
  1994年   12篇
  1993年   5篇
  1992年   6篇
  1991年   3篇
  1989年   2篇
  1987年   3篇
  1986年   2篇
  1985年   3篇
  1984年   2篇
  1983年   2篇
  1982年   6篇
  1980年   3篇
  1979年   3篇
  1977年   6篇
  1976年   4篇
  1974年   2篇
  1971年   1篇
  1969年   1篇
  1968年   1篇
  1951年   1篇
排序方式: 共有2299条查询结果,搜索用时 15 毫秒
991.
Regional policies seek to enable regions to increase their competitiveness and development, and as such one priority Objective of activities financed by Structural Funds is higher employment, higher productivity and economic activity. How efficiently the regions apply the funds is a fundamental issue for the development and continuity of regional policies. We therefore consider that determining the efficiency of European regional policies is an issue of high importance, and this is the main aim of this study. We have considered it appropriate to use the available information to apply a mathematical technique known as Data Envelopment Analysis (DEA), which allows us to calculate the technical efficiency and inefficiency of the Structural Funds applied in the Objective 1 regions for the period 2000–2006. Furthermore, we wish to determine if the regions have been more efficient in creasing their levels of employment or in increasing productivity. Our study applies this methodology along with other methods like regression analysis, profit analysis and factorial analysis to determine the variation in the rate of unemployment and productivity in these European Regions. The study reveals that only eight regions are efficient, although none of them is run in all the models.  相似文献   
992.
993.
994.
Book reviews     
Allen C. Guelzo, Abraham Lincoln: Redeemer President (Grand Rapids, Michigan: William B. Eerdmans Publishing Company, 1999). Pp.xii + 516. $29.00 (hardback). ISBN 0 8028 3872 3.

David L. Dykstra, The Shifting Balance of Power: American‐British Diplomacy in North America, 1842–1848 (Lanham, Md: University Press of America, 1999). Pp.xxxiv + 247. $39.00 (hardback). ISBN 0 7618 1316 2.

Kathryn Teresa Long, The Revival of 1857–58: Interpreting an American Religious Awakening (New York: Oxford University Press, 1998). Pp.x + 256. $45.00 (hardback). ISBN 0 1951 1293 8.

David Williams, Rich Man's War: Class, Caste, and Confederate Defeat in the Lower Chattahoochee Valley (Athens: University of Georgia Press, 1998). Pp.xiv + 288. $34.95 (hardback). ISBN 0 8203 2033.

Eugene D. Genovese, A Consuming Fire: The Fall of the Confederacy in the Mind of the White Christian South (Athens: University of Georgia Press, 1998). Pp.xvi 4–180. $24.95 (hardback). ISBN 0 8203 2046 3.

Randall M. Miller, Harry S. Stout, and Charles Reagan Wilson, eds., Religion and the American Civil War (New York: Oxford University Press, 1998). Pp.xiii + 422. $55.00 (hardback); $24.95 (paperback). ISBNs 0 1951 2128 7 and 0 1951 2129 5.

Daniel E. Sutherland, ed., Guerrillas, Unionists, and Violence on the Confederate Home Front (Fayetteville: University of Arkansas Press, 1999). Pp.250. $32.00 (hardback); $20 (paperback). ISBN 1 5572 8549 7; ISBN 1 5572 8550 0.  相似文献   
995.
996.

This paper analyzes the influence the Chemical Institute of Sarrià (IQS) ‐a private institution devoted both to the education of chemists and chemical engineers and to applied research‐ has had on Spain's chemical industry from 1916 onwards. The research reported is based upon three data sources (articles on industrial chemistry published by the IQS’ journal Afinidad and M. Se. theses; IQS graduates’ industrial activities; and technical services carried out by the Institute's staff for several companies). The main conclusion is that the IQS has had a remarkable impact on Catalan and Spanish industry. Although there are no other similar studies on Spanish scientific and technical institutions, the IQS case confirms that technical education and institutionalized research have a positive impact on the economic and industrial development of “latecomers” like Spain.  相似文献   
997.
998.

The paper outlines strategies for participatory research by comparing the results of a participatory workshop on research needs in human‐environmental interaction in Finnish Lapland with an analysis of official Finnish policy documents on the same subject. The workshop was organized in Anár/Inari, Finland in October 1997 as part of the Human Environmental Interactions theme (HEI) of the European Commission's Arctic‐Alpine Terrestrial Ecosystems Research Initiative (ARTERI). The mandate of ARTERI was to develop research themes and encourage their implementation to allow for discussions among local residents, natural and social scientists, and policy‐makers concerned with environmental protection and management in arctic and alpine regions of Europe. The objective of the Anár/Inari workshop was to discuss central issues of human‐environmental interaction in the region in a participatory mode with local interest groups, generate alternative scenarios for the region, and develop research and development project proposals on the basis of the scenarios. The paper discusses the scenarios and the project proposals that the workshop developed, and compares them with official Finnish policies on forestry and reindeer management in Lapland. From methodological and theoretical perspectives, the workshop was a unique empirical setting within which to investigate the dynamic interaction between traditional and modern knowledge sets on human‐environmental interaction. From the policy perspective, the comparison of workshop recommendations and official policies offers valuable indications for future directions in participatory policy‐making in the region and novel ways of balancing the conflicting demands on environmental resources, such as reindeer management, forestry, and tourism.  相似文献   
999.
1000.
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