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   5166篇
  免费   113篇
  国内免费   1篇
财政金融   874篇
工业经济   346篇
计划管理   804篇
经济学   1105篇
综合类   65篇
运输经济   27篇
旅游经济   63篇
贸易经济   797篇
农业经济   243篇
经济概况   938篇
邮电经济   18篇
  2021年   31篇
  2020年   65篇
  2019年   108篇
  2018年   124篇
  2017年   135篇
  2016年   123篇
  2015年   71篇
  2014年   128篇
  2013年   487篇
  2012年   159篇
  2011年   199篇
  2010年   160篇
  2009年   143篇
  2008年   150篇
  2007年   135篇
  2006年   119篇
  2005年   89篇
  2004年   87篇
  2003年   92篇
  2002年   85篇
  2001年   118篇
  2000年   107篇
  1999年   84篇
  1998年   99篇
  1997年   74篇
  1996年   71篇
  1995年   87篇
  1994年   58篇
  1993年   84篇
  1992年   74篇
  1991年   79篇
  1990年   72篇
  1989年   76篇
  1988年   66篇
  1987年   70篇
  1986年   75篇
  1985年   79篇
  1984年   91篇
  1983年   64篇
  1982年   70篇
  1981年   67篇
  1980年   76篇
  1979年   65篇
  1978年   47篇
  1977年   50篇
  1976年   42篇
  1975年   52篇
  1974年   33篇
  1973年   39篇
  1972年   34篇
排序方式: 共有5280条查询结果,搜索用时 0 毫秒
31.
32.
This paper reviews the transition of national accounts in the Commonwealth of Independent States (CIS) countries from the Material Product System (MPS) to the United Nations System of National Accounts (SNA) and discusses the major problems that still need to be solved in order to improve the quality of their national accounts. It argues that the MPS practice tended to exaggerate growth not because of different concepts, but because of methodological problems such as inadequate deflation due to poor price data and incomplete coverage of the non-observed economy as well as overpricing of new or modified products and institutional flaws that motivated data fabrication by enterprises. However, the heritages of the problems under the MPS, together with the emerging new types of institutional units, new sources of income and market-driven new services, have made the transition difficult.  相似文献   
33.
This paper examines Britain's long run growth and productivity performance since the late nineteenth century, taking an international comparative perspective and disaggregating by sector. Britain was richer than the United States and Germany in 1870 largely because of high levels of labour productivity in services and agriculture rather than in industry, together with a highly favourable structure, particularly a small share of the labour force in agriculture. By 1990, the productivity gap in manufacturing had not grown bigger. Rather, the deterioration in Britain's overall comparative labour productivity position has been concentrated in services and agriculture, together with the effects of structural change, particularly the later shift of labour out of agriculture in the United States and Germany.  相似文献   
34.
35.
Ohne ZusammenfassungÜbersetzt von Gerhard Tintner, WienÜbersetzt von Ragnar Nurkse, z. Zt. Wienaus dem Italienischen übersetzt von Dr. Hans Fried, WienÜbersetzt von Paul Brüll, Wien.Aus dem Italienischen übersetzt von Dr. Hans Fried.  相似文献   
36.
This paper analyses governance structures used to organize partnerships in R&D networks using two approaches: transaction costs theory and social capital theory. We argue that these theories are complementary; this explains forms of governance through the degrees of administrative (structural and safeguard mechanism) and social factors (cohesion and openness) they embody. Data was obtained from European R&D networks created through Framework Programmes which include a great number of universities, non profit institutions and firms. Findings show the variables that characterize and explain the governance forms based on the applicability of R&D networks. This study not only provides a theoretical model for analysing governance structures of these networks, but is also useful for both improving the management of networks and for fostering collaboration at an international level.  相似文献   
37.
38.
This paper examines the effect of network properties on the performance R&D joint projects. In particular, we examine the impact of network cohesion, diversity and shape on the performance of these of exploration and exploitation R&D projects. We test these measures using data on projects from European R&D networks developed under the framework of Eureka projects. The empirical results indicated some network properties enhance the project’s performance and these differ depending on the kind of technological project developed. Our results suggest a lower heterogeneity, greater cohesion and network centralisation in exploitation than in exploration projects. Our findings show different types of structures depending on the aim of the joint project and that there exist different degrees of cohesion between the partners that comprise the core and the peripheral nodes.  相似文献   
39.
This study compares a range of agricultural commodities over periods of varying economic circumstances. These commodities are examined over three categories, including returns, risk, and contribution to portfolio optimisation. Consistency in these categories is determined over four equal three-year stages which comprise pre-GFC (Global Financial Crisis), GFC, post-GFC and post-post GFC. To demonstrate resilience in the most extreme circumstances, the study uses Conditional Value at Risk (CVaR), which measures extreme risk in the tail of a distribution, as the risk measure and risk-return optimiser. The study thus provides a unique and comprehensive extreme-risk based focus which identifies and ranks the consistency of performance of agricultural commodities over a range of criteria and conditions. Cattle commodities consistently demonstrate the strongest overall performance in the categories examined.  相似文献   
40.
随着城市人口的增加和人们健康意识的增强,近年 来城市公园的使用率呈现迅速上升趋势。手机等智能电子设备 的高速发展,使人们可以在户外运动中监测自身活动轨迹、距 离和能量消耗等。以北京奥林匹克森林公园为例,通过手机 信令、微博、百度POI等大数据与GIS技术结合,构建依托大 数据的GIS耦合模型,从游人的行为需求出发对公园的慢跑游 线、景点热度、游人空间分布等进行使用后量化评价,并针对 问题提出北京奥林匹克森林公园的景观优化策略。结果显示大 数据与GIS的结合可以为公园的景观优化提供客观且理性的整 改依据,从而更科学地指导城市公园的景观提升。  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