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   24079篇
  免费   736篇
财政金融   4262篇
工业经济   1634篇
计划管理   4269篇
经济学   5856篇
综合类   257篇
运输经济   199篇
旅游经济   380篇
贸易经济   3992篇
农业经济   1213篇
经济概况   2667篇
信息产业经济   3篇
邮电经济   83篇
  2023年   137篇
  2021年   181篇
  2020年   353篇
  2019年   554篇
  2018年   596篇
  2017年   633篇
  2016年   617篇
  2015年   422篇
  2014年   659篇
  2013年   2660篇
  2012年   865篇
  2011年   912篇
  2010年   794篇
  2009年   877篇
  2008年   787篇
  2007年   694篇
  2006年   644篇
  2005年   553篇
  2004年   498篇
  2003年   501篇
  2002年   451篇
  2001年   526篇
  2000年   476篇
  1999年   429篇
  1998年   486篇
  1997年   423篇
  1996年   402篇
  1995年   362篇
  1994年   365篇
  1993年   351篇
  1992年   348篇
  1991年   362篇
  1990年   331篇
  1989年   242篇
  1988年   253篇
  1987年   258篇
  1986年   237篇
  1985年   353篇
  1984年   347篇
  1983年   327篇
  1982年   280篇
  1981年   286篇
  1980年   279篇
  1979年   276篇
  1978年   222篇
  1977年   179篇
  1976年   182篇
  1975年   157篇
  1974年   148篇
  1973年   145篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
The Amazon is the largest tropical forest area on Earth, and has been undergoing rapid deforestation for the last four decades. In the Brazilian Amazon, large‐scale pasture for cattle ranching and soybean production are the main land uses, leading to a yearly deforestation rate of 0.5%. These conversions are mostly located in frontier areas distributed along the so‐called “arc of deforestation”. Within this large zone, various land use change processes are interacting through several modes of land valuation and organisation. From several case studies in the State of Pará (Brazil), the current project aims at analysing how landscape dynamics are related to infrastructure development, ecological conditions, zoning policies and to the evolution and the organisation of the production, consumption and marketing chains of livestock products. This paper presents the results for one test site, the region of São Félix do Xingú, South of Pará This region is the focus of land speculation, cattle expansion, and deforestation. Road construction, investments in electrical energy, financial credit for cattle, and the land reform policies have all fuelled this process. All these factors make this region one of the most dynamic agricultural frontiers in the Brazilian Amazon. The main objective of the paper is to improve our understanding of deforestation processes by crossing spatial analyses and 1ivestock economics.studies, and to characterise the role and impact of various natural and anthropic factors in the location and development of the main types of farmers, and their policy implications.  相似文献   
92.
We evaluate the appropriateness of regulation within the Canadian cable television industry by applying both parametric and non-parametric approachesto measure scale efficiency. Although we begin with a sample offering adequatedegrees of freedom for parametric estimation, important policy issues lead us toconsider further estimation over sub-samples. Since some of these sub-samplesare small enough that parametric models cannot guarantee reliable estimates, weobtain production characteristics non-parametrically through data envelopmentanalysis. The nonparametric results for scale efficiency support the parametricresults. We find evidence against a natural monopoly argument that might havejustified continuation of the mandated monopolization of Canadian cable televisionservice. By the end of the sample period, there were no longer substantial economiesof scale in most relevant markets.  相似文献   
93.
94.
95.
96.
An algorithm is described to compute equilibria of the general economic model with incomplete asset markets, that is, of GEI. The algorithm is based on the existence of a route of zeros of a homotopy whose domain includes the price simplex and a Grassmann Manifold. This route is followed, in effect, by localizing and following diffeomorphic pieces in Euclidean space, and by relocalizing as is necessary.  相似文献   
97.
98.
99.
A new physical infrastructure to support activities based on communications and the transmission of information is being developed. Part of this infrastructure includes the construction of ‘intelligent’ buildings which are seen to play as important a role in improving efficiency of office workers as automation has played on the shopfloor of manufacturing industry. The location of these buildings is important. This article focuses on two types of experimental office development—neighbourhood offices and resort offices.  相似文献   
100.
This article begins with an explanation of how moral development for organizations has parallels to Kohlberg's categorization of the levels of individual moral development. Then the levels of organizational moral development are integrated into the literature on corporate social performance by relating them to different stakeholder orientations. Finally, the authors propose a model of organizational moral development that emphasizes the role of top management in creating organizational processes that shape the organizational and institutional components of corporate social performance. This article represents one approach to linking the distinct streams of business ethics and business-and-society research into a more complete understanding of how managers and firms address complex ethical and social issues.  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