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   17777篇
  免费   98篇
财政金融   3378篇
工业经济   1471篇
计划管理   3189篇
经济学   3640篇
综合类   195篇
运输经济   143篇
旅游经济   285篇
贸易经济   2604篇
农业经济   779篇
经济概况   2183篇
信息产业经济   1篇
邮电经济   7篇
  2021年   115篇
  2020年   202篇
  2019年   258篇
  2018年   355篇
  2017年   343篇
  2016年   325篇
  2015年   231篇
  2014年   387篇
  2013年   1784篇
  2012年   499篇
  2011年   515篇
  2010年   494篇
  2009年   573篇
  2008年   509篇
  2007年   435篇
  2006年   414篇
  2005年   339篇
  2004年   364篇
  2003年   359篇
  2002年   345篇
  2001年   355篇
  2000年   375篇
  1999年   335篇
  1998年   318篇
  1997年   311篇
  1996年   291篇
  1995年   275篇
  1994年   272篇
  1993年   302篇
  1992年   279篇
  1991年   290篇
  1990年   264篇
  1989年   250篇
  1988年   233篇
  1987年   210篇
  1986年   239篇
  1985年   331篇
  1984年   314篇
  1983年   315篇
  1982年   271篇
  1981年   268篇
  1980年   277篇
  1979年   234篇
  1978年   203篇
  1977年   185篇
  1976年   166篇
  1975年   140篇
  1974年   129篇
  1973年   126篇
  1972年   92篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
941.
    
Recent work by Y. Kannai and B. Peleg shows that two appealing axioms for extending a linear order on a set of six or more elements to a weak order on the family of non-empty subsets of that set are mutually incompatible. This comment shows that a modest restriction of their monotonicity axiom is compatible for extension with a generalization of their other axiom provided that the linear order on the basic set is a well ordering.  相似文献   
942.
943.
The paper develops a North–Middle–South model to formulate a middle economy that plays catch-up via imitative R&D to acquire newer technologies from a higher-wage innovative forerunner, while playing “reverse catch-up” via outbound FDI to transfer older technologies to a lower-wage follower. A critical policy dilemma facing the middle economy is how to balance its R&D-driven technology inflows against its FDI-driven technology outflows. Numerical simulations are used for dynamic welfare analysis. This paper finds that tightening FDI permits the middle economy to keep a lower saving rate without weakening its ability to acquire newer technologies in the long run.  相似文献   
944.
945.
This paper analyses the potential welfare gains of introducing a technology transfer from Annex I to non-Annex I in order to mitigate greenhouse gas emissions. Our analysis is based on a numerical general equilibrium model for a world-economy comprising two regions; North (Annex I) and South (non-Annex I). In a cooperative equilibrium, a technology transfer from the North to the South is clearly desirable from the perspective of a ‘global social planner’, since the welfare gain for the South outweighs the welfare loss for the North. However, if the regions do not cooperate, then the incentives to introduce the technology transfer appear to be relatively weak from the perspective of the North; at least if we allow for Southern abatement in the pre-transfer Nash equilibrium. Finally, by adding the emission reductions associated with the Kyoto agreement, our results show that the technology transfer leads to higher welfare in both regions.  相似文献   
946.
    
Objective: Epilepsy surgery is one of the most effective treatments in modern medicine. Yet, it remains largely under-utilized, in spite of its proven efficacy. The referrals for epilepsy surgery are often delayed until it is too late to prevent the detrimental psychosocial effects of refractory seizures. The reluctance towards epilepsy surgery is influenced by the perceived risks of the procedure by practitioners and patients. This review discusses how, in general decision-making processes, one faces a natural tendency towards emphasizing the risks of the most immediate and operational decision (surgery), at times without contrasting these risks with the alternative (uncontrolled epilepsy).

Methods: In the field of economics, this bias is well recognized and can be overcome through marginal analysis, formally defined as focusing on incremental changes as opposed to absolute levels.

Results: Regarding epilepsy surgery, the risks and benefits of surgery are considered separately from the risks of uncontrolled epilepsy. For instance, even though surgery carries an ~0.1–0.5% risk of perioperative mortality, the chance of sudden unexpected death with refractory epilepsy can be as high as 0.6–0.9% per year. It is suggested that the inadequate way of phrasing clinical questions can be a crucial contributing factor for the under-utilization of epilepsy surgery.

Significance: It is proposed that examining decision-making for epilepsy surgery in the context of marginal analysis may enable providers and patients to make more accurate informed decisions.  相似文献   
947.
Identifying the value orientations of subjects participating in market or non-market decisions by having them participate in a ring game may be helpful in understanding the behaviour of these subjects. This experiment presents the results of changes in the centre and the radius of a value orientations ring in an attempt to discover if the measured value orientations exhibit income or displacement effects. Neither significant income effects nor displacement effects are identified. An external validity check with a voluntary contribution game provides evidence that value orientations from rings centred around the origin of the decision-space explain significant portions of voluntary contributions while value orientations from displaced rings do not.  相似文献   
948.
  总被引:1,自引:0,他引:1  
The article analyzes the welfare cost of the U.S. sugar program using a multimarket model of U.S. sweetener markets. The latter includes raw crops, sugar extraction and refining, and sweetener users (food-processing industries and final consumers). The authors address the industrial organization of food industries using sweeteners and treat the United States as a large importer. With the removal of the program, this article estimates (all figures in 1999 dollars) that in 1998 cane growers, sugar beet growers, and processors would have lost $307, $650, and $89 million, respectively; sweetener users would have gained $1.9 billion. World prices would have increased by 13.2%. The deadweight loss of the program is estimated at $532 million.  相似文献   
949.
The Canada Foundation for Innovation (CFI) and the Canadian Institutes of Health Research (CIHR) allied to analyze the impact of their investments in medical imaging research. The CFI funds capital and operating programs for research infrastructure, and CIHR's mandate concentrates its funding on research activity. It happens that CIHR-funded research consumes CFI-funded infrastructure as an input in the innovation process. Apart from a few partnered programs, by design there is no coordination between CFI and CIHR funding decisions. Together, these agencies invested $916 million over a 14-year-period. In this paper, we evaluate the economic and health benefits from advancements in one funded area, namely computed tomography perfusion (CTP). CTP is an imaging technique that uses computed tomography to measure blood flow in organs and tissues. It is mostly used to assess acute ischemic stroke. The net social benefits attributable to these investments are substantially positive: the benefit-to-cost ratio is estimated to be between 6.66-to-1 and 9.99-to-1. We review how public investments from multiple funders comingle in the innovation process to deliver social value and improved health outcomes.  相似文献   
950.
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