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   30750篇
  免费   335篇
财政金融   5607篇
工业经济   1827篇
计划管理   4805篇
经济学   6849篇
综合类   607篇
运输经济   105篇
旅游经济   241篇
贸易经济   6693篇
农业经济   633篇
经济概况   3092篇
信息产业经济   46篇
邮电经济   580篇
  2023年   74篇
  2021年   88篇
  2020年   200篇
  2019年   263篇
  2018年   2579篇
  2017年   2341篇
  2016年   1504篇
  2015年   294篇
  2014年   429篇
  2013年   1702篇
  2012年   814篇
  2011年   2360篇
  2010年   2202篇
  2009年   1933篇
  2008年   1886篇
  2007年   2182篇
  2006年   402篇
  2005年   650篇
  2004年   733篇
  2003年   823篇
  2002年   528篇
  2001年   345篇
  2000年   342篇
  1999年   298篇
  1998年   322篇
  1997年   264篇
  1996年   238篇
  1995年   224篇
  1994年   239篇
  1993年   241篇
  1992年   264篇
  1991年   255篇
  1990年   203篇
  1989年   181篇
  1988年   166篇
  1987年   164篇
  1986年   180篇
  1985年   238篇
  1984年   255篇
  1983年   247篇
  1982年   214篇
  1981年   196篇
  1980年   169篇
  1979年   167篇
  1978年   156篇
  1977年   133篇
  1976年   125篇
  1975年   140篇
  1974年   100篇
  1973年   100篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Aims: Examine healthcare costs across chronic kidney disease (CKD) stages for US patients with type 2 diabetes (T2D).

Materials and methods: IQVIA Real World Data Adjudicated Claims linked electronic medical records and insurance claims from January 1, 2012 through March 31, 2017 were used for this retrospective study. Adults diagnosed with T2D and comorbid CKD were included. General linear models incorporating splines were constructed, and information from these regressions were used to inform the relationship between medical costs and CKD. Multivariable analyses controlled for patient characteristics, vital signs, general health, prior medication use, prior visit to specialists, index A1c, and year of index date.

Results: There were 6,645 individuals who met the study criteria. Results generally indicate sharp increases in annual total medical costs and non-drug medical costs in the 1?year post-period for patients with Stage 4 or 5 CKD (estimated glomerular filtration rate [eGFR]?≤?30?mL/min/1.73 m2) with each 1 point reduction in eGFR from 30 associated with an increase of $1,870 in all-cause total medical costs (p?<?0.0001) and $1,805 of all-cause non-drug medical costs (p?<?0.0001). Similarly, each point decline below 30?mL/min was associated annual cost increases of $1,701 for CKD-related total medical costs, $1,695 for CKD-related non-drug medical costs, $173 for diabetes-related medical costs, and $187 for diabetes-related non-drug medical costs (all p?<?0.0001).

Limitations: The investigation included only patients with medical insurance and laboratory test results, and results may not be generalizable to all T2D patients with CKD. The methodology allowed us to determine associations, not causation, and potential confounders, such as duration of diabetes, diet, exercise, or social support, could not be assessed.

Conclusions: Results indicate there are sharp and significant increases in medical costs among T2D patients with Stage 4 and 5 CKD compared to those with earlier stages of CKD.  相似文献   
992.
993.
This paper reviews the impact of India's reforms since 1991 on the performance of the Indian economy. It shows that the reforms definitely achieved a significant acceleration in growth and they also succeeded in reducing poverty. However, they have been less successful in generating good quality jobs. There was progress in providing better access to education, health services ,and clean drinking water and sanitation, but less than was hoped. The area where performance has been most disappointing is environmental sustainability. The paper concludes by identifying some of the critical policy challenges in the years ahead.  相似文献   
994.
In this article, the authors illustrate the use of Bloomberg for analyzing topics in macroeconomics and monetary policy in economics and finance courses. The hands-on experience that students gain from such a course has many benefits, including deeper learning and clearer understanding of data. The authors describe goals and learning objectives, then compare Bloomberg with Federal Reserve Economic Data (FRED). In addition, they provide examples of how to use Bloomberg in the classroom, describe how to have students perform sector analysis, show how Bloomberg tools are useful for analyzing monetary policy, discuss how to use Bloomberg to analyze the financial sector, and illustrate the platform’s use in a case study.  相似文献   
995.
Total factor productivity (TFP) growth in Canada between 2002 and 2014 has been only 0.16% per year. This figure is substantially smaller than that of the United States, or that of Canada in the past. We perform multiple counterfactual exercises to show that this small TFP growth cannot be accounted for by several compositional effects or mismeasurements of factors of production. We identify two key sectors (mostly Mining and to a lesser extent Manufacturing) that drive all of the TFP growth difference with the United States. Despite the lack of TFP growth, Canada has experienced sustained income growth due to a prolonged period of appreciation of the terms of trade (while US terms of trade have deteriorated), making real income in the two countries grow at similar rates.  相似文献   
996.
We examine the impact of anticorruption reforms on tax evasion when corruption and potentially harassment are endemic among tax auditors. We find that the threat of harassment may counterintuitively boost the impact of such anticorruption reforms on tax evasion and also eliminate corruption. Specifically, a moderate anticorruption policy can discontinuously reduce tax evasion to a level even below that under no corruption. Further strengthening of such policy can nonetheless prove counterproductive and increase tax evasion. On the contrary, in the absence of harassment, a moderate anticorruption reform induces higher tax evasion and sustenance of bribery. In this case, only a large reform can reduce tax evasion and eliminate corruption.  相似文献   
997.
Would a foreign firm’s consumer‐oriented corporate social responsibility (CSR) activities be rewarded by an importing country’s voluntary tariff reduction? The current paper addresses this question in an import‐competing duopoly model with vertical product differentiation. It is shown that the tariff will decrease if the foreign firm switches from a purely profit‐driven firm to a CSR firm. A consumer‐oriented CSR strategy will always hurt the domestic firm’s profit, whereas the relationship between the foreign firm’s profit and CSR sensitivity (the degree to which a firm cares about consumer welfare) is invertedly U‐shaped. When firms’ decisions to switch to CSR are endogeneized, only the foreign firm will become a CSR firm.  相似文献   
998.
999.
ABSTRACT

This study aims to investigate the impact of competition on determinants of allocative, scope and cost efficiencies of Indian scheduled commercial banks (SCBs). Specifically, the study, analyzes the impact of the second round of licensing on the efficiency of Indian SCBs. This is the first paper to measure scope efficiency of Indian banks and analyze its determinants. A two-stage analysis is performed on a balanced panel dataset of Indian SCBs for the period 1999–2016. In the first stage, the allocative, cost and scope efficiencies for each bank are estimated following the data envelopment analysis approach. In the second stage, internal determinants of the stated efficiency measures are estimated following the system of the generalized method of moments approach. The findings suggest that competition has not resulted in enhancing the efficiency of Indian SCBs. Among factors that can influence efficiency, it is seen that size does matter. Larger banks can enhance the efficiency of SCBs. It is also seen that having more foreign banks improves the overall efficiency of SCBs. However, before embarking on further rounds of licensing, the study posits that market-driven correction to succeed, it is imperative to address sunspots in the form of investor or borrower repression.  相似文献   
1000.
This paper examines the links among casinos, hotels, and crime using Indiana's counties for 1994‐2004. In estimating casinos' impacts, I introduce a measure of casino activity in addition to variables related to the timing of casino opening. I test whether or not the number of hotel rooms affects crime rates. Increased casino activity reduces crime rates except for burglary, where crime rates rise after a lag. Leaving out a measure of casino activity appears to create a serious specification error. Finally, including problem crime data plagued by incomplete reporting affects the estimated impact of casinos on crime. (JEL R11, L83)  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