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   29454篇
  免费   302篇
财政金融   4938篇
工业经济   1695篇
计划管理   4564篇
经济学   6505篇
综合类   572篇
运输经济   76篇
旅游经济   217篇
贸易经济   6365篇
农业经济   580篇
经济概况   3605篇
信息产业经济   45篇
邮电经济   594篇
  2020年   128篇
  2019年   191篇
  2018年   2565篇
  2017年   2339篇
  2016年   1500篇
  2015年   259篇
  2014年   356篇
  2013年   1252篇
  2012年   799篇
  2011年   2347篇
  2010年   2112篇
  2009年   1826篇
  2008年   1845篇
  2007年   2154篇
  2006年   332篇
  2005年   621篇
  2004年   686篇
  2003年   822篇
  2002年   487篇
  2001年   283篇
  2000年   277篇
  1999年   251篇
  1998年   243篇
  1997年   202篇
  1996年   210篇
  1995年   182篇
  1994年   181篇
  1993年   214篇
  1992年   191篇
  1991年   191篇
  1990年   160篇
  1989年   171篇
  1988年   150篇
  1987年   141篇
  1986年   151篇
  1985年   249篇
  1984年   242篇
  1983年   216篇
  1982年   200篇
  1981年   190篇
  1980年   202篇
  1979年   197篇
  1978年   161篇
  1977年   175篇
  1976年   144篇
  1975年   134篇
  1974年   125篇
  1973年   128篇
  1971年   92篇
  1970年   94篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
981.
Using process tracing, this paper charts the history of the changes in the EU’s revenue since 1970, including package deals and the unforeseen consequences of change, comparing the positions of the Council to those of the European Commission and European Parliament. Those revenue decisions allowed European integration to proceed though without a fully autonomous budget as Member States became more careful to calculate their net benefits or costs in relation to the budget. In December 2013, the European Union’s institutions established a High Level Group to recommend changes to the revenue base of the EU’s budget. This reported in January 2017, proposing to resolve the effect of sub-optimal revenue and budget decisions made by the European Union over many years, to reduce direct national contributions, to minimise the risk of unforeseen consequences, and to combine revenue flows with steering effects to discourage certain forms of economic behaviour in line with the wider policy agenda of the European Union.  相似文献   
982.
The prices of lots of assets have been proved in literature to exhibit special behaviors around psychological barriers, which is an important fact needed to be considered when pricing derivatives. In this paper, we discuss the valuation problem of double barrier options under a volatility regime-switching model where there exist psychological barriers in the prices of underlying assets. The volatility can shift between two regimes, that is to say, when the asset price rises up or falls down through the psychological barrier, the volatility takes two different values. Using the Laplace transform approach, we obtain the price of the double barrier knock-out call option as well as its delta. We also provide the eigenfunction expansion pricing formula and examine the effect of the psychological barrier on the option price and delta, finding that the gamma of the option is discontinuous at such barriers.  相似文献   
983.
984.
This paper aims to provide empirical evidence for the connections between new trade theory and the spatial distribution of economic activities, considering the results obtained by the literature on New Economic Geography as a starting point. To do this, we apply Social Network Analysis specifically to the World Automotive Trade Network. We explore the structural features of the auto network for the years 1996 and 2009 using data on trade flows for 172 countries. Our findings suggest that the auto network has become denser, more extensive and more integrated over time, depicting a center-periphery structure in which regional clusters play a prominent role. In this configuration, strong agglomeration forces generated by companies’ desire for large and rich market access with minimum transportation costs are balanced by the search for new high-potential markets.  相似文献   
985.
This paper examines the differences in characteristics of federal and state chartered banks by using individual commercial bank’s data sets from 1984 to 2006. The findings indicate significant differences between these two groups of banks in terms of their asset and liability management strategies. In line with these differences, credit channel of monetary policy is found to work differently for state and federal banks. Federal banks are found to be more responsive to monetary policy changes.  相似文献   
986.
High-tech firms increasingly rely on inter-firm collaboration (IFC) in new product development (NPD). While there is a growing research interest in exploring the economic rationale of IFC through the transaction cost economics (TCE) and the resource synergy of IFC through the resource-based view of the firm (RBV), little attention has been given to the institution-based view (IBV) that also has important implications for firms’ choice of IFC. In particular, how national institutional environment affects IFC in the NPD process remains under-researched. This study aims to contribute to the literature by extending our understanding of the role of IFC in firms’ NPD process, taking into account transactional, resource, and institutional factors. Based on a case study of two firms: a state-owned and a private pharmaceutical firm in China, our research identifies three key forms of IFC, which are dynamic at different stages of NPD and contingent upon an array of institutional, resource, and transactional rationales underpinning firms’ choice of different forms of IFC. Our study is the first one that investigates the role of IFC in the NPD process bringing together the IBV, RBV, and TCE perspectives.  相似文献   
987.
988.
989.
The assessment of future mortality is of high importance in many areas where the allocation of future resources has to be planned in time, especially in social security and private life insurance. This contribution represents an extension of the classic forecasting approaches of Bell–Monsell and Lee–Carter. Based on a forecast of the first two principal components, age- and sex-specific survival probabilities for 18 Western European countries are predicted simultaneously until the year 2070. In addition to the correlations in the mortality trends between the age groups and the genders, international trends in mortality are captured as well. A major improvement in the classic Lee–Carter models is the adequate quantification of the uncertainty associated with the whole system of variables by stochastic simulation of all remaining principal components with simple time series models. The model’s easy applicability to further analyses is illustrated by forecasting the median life span as well as the resulting Gender Gap for Germany, France, and Italy.  相似文献   
990.
The authors argue that it is possible to partly automate the process of abstract control of fairness of clauses in online consumer contracts. The authors present a theoretical and empirical argument for this claim, including a brief presentation of the software they have designed. This type of automation would not replace human lawyers but would assist them and make their work more effective and efficient. Policy makers should direct their attention to the potential of using algorithmic techniques in enforcing the law regarding unfair contractual terms, and to facilitating research on and ultimately implementing such technologies.  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