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   27975篇
  免费   398篇
财政金融   4840篇
工业经济   1518篇
计划管理   4402篇
经济学   6481篇
综合类   578篇
运输经济   115篇
旅游经济   213篇
贸易经济   6455篇
农业经济   413篇
经济概况   2733篇
信息产业经济   44篇
邮电经济   581篇
  2023年   113篇
  2021年   118篇
  2020年   195篇
  2019年   236篇
  2018年   2571篇
  2017年   2397篇
  2016年   1536篇
  2015年   327篇
  2014年   389篇
  2013年   1674篇
  2012年   814篇
  2011年   2251篇
  2010年   2126篇
  2009年   1832篇
  2008年   1764篇
  2007年   2036篇
  2006年   324篇
  2005年   614篇
  2004年   661篇
  2003年   761篇
  2002年   455篇
  2001年   251篇
  2000年   229篇
  1999年   171篇
  1998年   206篇
  1997年   176篇
  1996年   177篇
  1995年   127篇
  1994年   133篇
  1993年   148篇
  1992年   169篇
  1991年   167篇
  1990年   117篇
  1989年   119篇
  1988年   98篇
  1987年   115篇
  1986年   137篇
  1985年   172篇
  1984年   152篇
  1983年   171篇
  1982年   151篇
  1981年   131篇
  1980年   148篇
  1979年   128篇
  1978年   97篇
  1977年   109篇
  1976年   105篇
  1975年   103篇
  1974年   99篇
  1973年   76篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
991.
992.
This paper develops a risk-based capital pricing model for credit insurance portfolios held by a vulnerable insurer. The model accounts for business cycles using a two-state Markov switching model, and allows for dynamic leverage adjustment by the insured firms. The new proposed model, which incorporates risk-based capital practice, is better for both the insurer and the insured firms. Based on the risk-adjusted performance metric, we found that the insurer is better off insuring short- and medium-term loans in expansion and steady states, while it is better off backing both short- and long-term loans in recessions. Our results also emphasize that macroeconomic uncertainty significantly impairs the creditworthiness of the insurer and insured firms.  相似文献   
993.
994.
Ensemble methods can be used to construct a forecast distribution from a collection of point forecasts. They are used extensively in meteorology, but have received little direct attention in economics. In a real-time analysis of the ECB’s Survey of Professional Forecasters, we compare ensemble methods to histogram-based forecast distributions of GDP growth and inflation in the Euro Area. We find that ensembles perform very similarly to histograms, while being simpler to handle in practice. Given the wide availability of surveys that collect point forecasts but not histograms, these results suggest that ensembles deserve further investigation in economics.  相似文献   
995.
996.
This study explores gender differences in positive perceptions, anxiety, and depression among mothers and fathers of children with intellectual disabilities (IDs). We examined the relationship between these variables and certain characteristics of both the child (age and severity of disability) and the parents (age, educational level, and employment status). A sample of 60 mother/father couples who had children with IDs completed the Positive Contributions Scale to measure their positive perceptions, and the Hospital Anxiety and Depression Scale to assess their level of anxiety and depression. Bivariate analyses were used to determine differences between fathers and mothers as regards their positive perceptions and levels of anxiety and depression. A logistic regression model was then applied to identify which of the variables might be significant predictors of the gender differences observed among parents. Both mothers and fathers had positive perceptions of their children with IDs that co-existed with symptoms of anxiety and depression, with scores being higher among mothers. The predictive analysis of gender showed that individual variables (such as the employment status of both parents) may explain these differences.  相似文献   
997.
Effects of direct flights on trade costs are investigated using micro price data at the city level. After controlling for local retail/distribution costs, traded input prices are obtained to be further used in the measurement of trade costs across cities through arbitrage conditions. The existence of a direct flight enters trade costs regressions negatively and significantly. The results are shown to be robust to the consideration of many control variables, nonlinearities in the effects of distance on trade costs, possible endogeneity of having direct flights between cities and alternative definitions of the data. The direct flights that are shown to be determined by bilateral air services agreements are further shown to reduce trade costs through an endogeneity analysis; the main policy implications are twofold: (i) international trade policies through aviation services, such as Open Skies Agreements of the US, are alternative trade policy tools to reduce international trade barriers; (ii) direct flights facilitate the integration of internal markets as in the case of European Union.  相似文献   
998.
999.
Future costs and revenues in capital investment opportunities can seldom be predicted with certainty. As a result, there is usually some doubt as to the outcome of an investment. The chance that an investment may not prove profitable represents the investor's risk. This paper considers the problems which uncertainty and risk present in the evaluation of capital investments. Several traditional methods of dealing with uncertainty and risk are considered and shown to be deficient. A relatively new evaluation technique, which utilizes probability theory and computer simulation, is then described and its advantages highlighted. It is suggested that this technique will prove valuable in the evaluation of future marine capital investments.  相似文献   
1000.
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