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   1782篇
  免费   191篇
财政金融   113篇
工业经济   170篇
计划管理   143篇
经济学   256篇
综合类   8篇
运输经济   3篇
旅游经济   2篇
贸易经济   121篇
农业经济   1114篇
经济概况   43篇
  2023年   9篇
  2022年   18篇
  2021年   19篇
  2020年   10篇
  2019年   16篇
  2018年   19篇
  2017年   22篇
  2016年   36篇
  2015年   54篇
  2014年   17篇
  2013年   73篇
  2012年   20篇
  2011年   213篇
  2010年   81篇
  2009年   109篇
  2008年   108篇
  2007年   155篇
  2006年   160篇
  2005年   152篇
  2004年   129篇
  2003年   84篇
  2002年   88篇
  2001年   74篇
  2000年   71篇
  1999年   39篇
  1998年   24篇
  1997年   39篇
  1996年   11篇
  1995年   5篇
  1994年   7篇
  1993年   18篇
  1992年   8篇
  1991年   6篇
  1990年   7篇
  1989年   3篇
  1988年   4篇
  1987年   4篇
  1985年   8篇
  1984年   4篇
  1983年   4篇
  1982年   5篇
  1981年   6篇
  1979年   6篇
  1977年   5篇
  1976年   3篇
  1975年   2篇
  1973年   4篇
  1970年   2篇
  1968年   2篇
  1955年   1篇
排序方式: 共有1973条查询结果,搜索用时 15 毫秒
1.
In this paper, a micro-founded model analyzing the effects of ‘regionalization’ on economic activity is developed. It shows that the spatial division of public competencies can have an impact on the growth rate via the efficiency of governmental choices: initially advantageous for weak levels, decentralization (/reduction of regional size) becomes limited due to the risk of underestimation of the real profitability of public expenditure by local governments (non-internalized cross-border effects). In accordance with the theory, a transversal estimation for a sample of 51 countries for the 1990s establishes a ‘bell-shaped’ relation between indicators of regionalization and the quality of governance.  相似文献   
2.
Why are some transformational change attempts implemented while others are rejected? This study suggests that patterns of underlying multiple rationalities commitments help to explain. Data from four periods of configuration and 11 transformational change attempts spanning a 40-year organizational history are analysed using a multiple rationalities framework. The findings suggest that transformational change attempts are ubiquitous, that transformational changes are more likely to be implemented if supported primarily by value-based rationality, and that organizational members' support for an incumbent configuration increases over time. The conclusion calls for a reconceptualization of configuration, and the inclusion of rejected change attempts in future studies of change and stability.  相似文献   
3.
This paper is interested in the modelling of the relationship between active and passive labour market policies and the aggregate unemployment outflow rate. Our model is based on a matching function and includes a simple representation of the competition between various groups of job searchers. The empirical analysis uses Belgian data. Faced with variables that are often integrated of order 1 according to the usual tests but which cannot strictly speaking be integrated, we contribute to an important methodological debate by comparing the conclusions of a classical econometric analysis and a cointegration approach.  相似文献   
4.
以油藏监测工作中的油藏压力监测为例,介绍了标准化工作在压力资料录取及解释分析中的作用。并用实例说明了标准化作业在油田开发方案的制定及油藏压力监测中的应用。  相似文献   
5.
皖江城市带经济差异与其自然地理成因分析   总被引:2,自引:0,他引:2  
通过2001~2006年的城市经济统计资料的对比,得出皖江城市带的流域经济特征:一是区段性,皖江段处在长江流域经济的低谷,巢湖"大湖经济"不突出;二是差异性,皖江城市带内部发展不平衡,存在东西差异和南北差异,具有流域空间分异特征;从自然地理要素角度来看,断裂、地形地貌差异、洪灾差异、冲洪积平原面积差异以及区域自然地理特征对现代交通布局和航运的影响等是造成皖江城市带经济差异性的自然原因.  相似文献   
6.
利用1998~2004年的土地利用结构数据,分析了黑龙江省土地利用现状和变化过程,在研究时段内耕地减少,林地和建设用地增加;浅析了土地变化的原因.  相似文献   
7.
全国土壤污染状况调查中采样点定位方法初探   总被引:3,自引:0,他引:3  
探讨了通过互联网利用Google Earth以及中文地图网页对全国土壤污染状况调查中的采样点进行定位的方法,阐述了必要的操作步骤及应用技巧,指出了这种方法的不足,提出应用此方法可大大提高土壤样品采集的工作效率。  相似文献   
8.
We investigate how the elimination of intra-European exchange risk may affect international financial markets using a conditional version of the International CAPM. We estimate the EMU and non-EMU components of aggregate currency risk and document significant exposures to both. The premium for EMU risk is positive and associated with exposure to the French, Italian and Spanish currencies. The premium for non-EMU risk is consistently negative and accounts for most of the aggregate currency premiums. In the 1990s, exposures to EMU risk declined significantly while exposures to non-EMU risk increased. Hence the adoption of the Euro is unlikely to have a large impact on aggregate currency risk premiums.  相似文献   
9.
讨论了全低变工艺开发过程中遇到的一些问题和对策,对中、小氮肥企业进行技术改造具有一定的参考意义。  相似文献   
10.
We point out that the Consistency, Continuity and Associativity properties of an extended realvalued functionalm on masses are the basic notions to get a de Finetti-Kolmogoroff-Nagumo type integral representation ofm.
Riassunto Come è noto il teorema di de Finetti-Kolmogoroff-Nagumo formisce una rappresentazione integrale di particolari funzionali reali, detti medie, definiti per funzioni di ripartizione che distribuiscono l'intera massa su un prefissato intervallo chiuso e limitato dell'asse reale.Nel lavoro [2] gli autori hanno esteso la nozionc di media, considerata ancora come funzionale reale, dalle funzioni di ripartizione alle masse (misure finitamente additive limitate e non negative). In questo modo, estendendo ad essa le usuali proprictà (internalità, associatività, etc.), sono riusciti a provare un teorema di rappresentazione integrale analogo a quello di de Finctti-Kolmogoroff-Nagumo per medie continue ed associative definite su opportuni insiemi di masse tight (cio prive di masse aderenti a – e+).In questo lavoro, naturale prosccuzione del preccedente, si prendono invecc in considerazione medic generalizzate (cioè medie che possono assumere valori reali oppure anche i valori – c+) e masse non neccssariamente tight. Si fa allora vedere che le nozioni di consistenza, continuità e associatività per un funzionale a valori nella retta compatta e definito sulle masse non nulle, sono condizioni caratteristiche per ottencre una sua rappresentazione integrale del tipo de Finctti-Kolmogoroff-Nagumo. Si prova inoltre che, a differenza della media ariumetica, le medic generalizzate continue ed associative possono assumere valori non reali solamente su opportune masse non tight.


Work performed under the auspices of the National Group for Sthocastic Models and Mathematical Statistics (M.R.S.T. 40%) and G.N.A.F.A. of C.N.R.  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