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   36298篇
  免费   444篇
财政金融   6375篇
工业经济   2152篇
计划管理   5651篇
经济学   8167篇
综合类   659篇
运输经济   125篇
旅游经济   282篇
贸易经济   7769篇
农业经济   932篇
经济概况   3980篇
信息产业经济   46篇
邮电经济   604篇
  2021年   132篇
  2020年   196篇
  2019年   319篇
  2018年   2700篇
  2017年   2426篇
  2016年   1621篇
  2015年   351篇
  2014年   497篇
  2013年   1913篇
  2012年   1013篇
  2011年   2512篇
  2010年   2261篇
  2009年   2064篇
  2008年   2045篇
  2007年   2358篇
  2006年   583篇
  2005年   856篇
  2004年   939篇
  2003年   1045篇
  2002年   700篇
  2001年   443篇
  2000年   456篇
  1999年   358篇
  1998年   375篇
  1997年   316篇
  1996年   345篇
  1995年   300篇
  1994年   311篇
  1993年   304篇
  1992年   318篇
  1991年   302篇
  1990年   298篇
  1989年   259篇
  1988年   214篇
  1987年   239篇
  1986年   256篇
  1985年   388篇
  1984年   342篇
  1983年   327篇
  1982年   284篇
  1981年   292篇
  1980年   278篇
  1979年   274篇
  1978年   258篇
  1977年   259篇
  1976年   232篇
  1975年   214篇
  1974年   160篇
  1973年   169篇
  1972年   134篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Mixed methods researchers often neglect the methodological discussion on data in general and process-generated data specifically. Assuming that the advantages and disadvantages of surveys, interviews and observations are well-known, the author discusses when and why researchers should prefer process-generated data to research-elicited data in market sociology. The author then compares four different types of process-generated data (aggregated statistical data, business directories, newspaper articles, engineering literature). For each data type, the author (a) describes the data type, (b) illustrates what kind of information researchers can gain from this data type and (c) discusses the draw-backs and limits of the data. The article concludes with a discussion of what one can learn for mixing methods and market sociology from this example and why primary data might be useful as an alternative data source after all.  相似文献   
993.
Bond laddering is a popular fixed-income investment strategy. The main purpose of this paper is to develop a methodology for determining private investors’ most interest rate risk (IRR)-return-efficient investment horizon for bond ladders (BLs), which are virtually free of credit risk. Two IRR measures of a continuously rolling and homogenous BL (CRHBL) are analytically derived under the assumption that interest rates are martingales. The first measure is the modified duration, which assumes a flat term structure of interest rates. However, this assumption is not fully supported by the empirical data and, thus, an additional IRR measure is proposed. Under each of these two measures, the ratios between the annual return in excess of the demand deposit rate and IRR of CRHBLs with different investment horizons are calculated. As expected, CRHBLs with rather low IRR are most risk-return-efficient. The results for the theoretical CRHBLs also apply to “real-world” discrete BLs. Thus, the proposed methodology can help private investors construct IRR-return-efficient discrete BLs.  相似文献   
994.
995.
Are directors’ dealings reports informative for outside investors? We analyze short-term announcement effects for 2782 companies from eight European countries between January 2003 and December 2009. We find significant announcement effects in four out of eight countries after directors’ dealings reports have been disclosed. For most countries, the magnitude of the announcement effect depends on transaction size, firm size, book-to-market ratio, and multiple trades by different insiders on the same trading day. The results are stronger for purchases than for sales. For France, Ireland, and Sweden, we find tentative evidence that the corporate position of an insider is connected to the size of the announcement effect.  相似文献   
996.
The article analyzes the impact of the collapse of world oil prices on the reduction of defense budget, production of weapons, innovative and personnel potential of the defense industry, and on country’s defense capability. Some proposals for the concept of structural changes in the defense industry have been formulated based on experience converting the defense industries in the Soviet Union, the United States, China, and France.  相似文献   
997.
998.
999.
1000.
This paper reviews the existing mechanisms of innovative development in the world economy focusing on emerging technologies markets evolution on the example of nanotechnology. The question has been raised of whether nanotechnologies can provide the core of the new technological revolution, and whether these prospects exist for NBIC convergence. In this connection the development of the global market for nano-enabled products following the 2007–2009 crisis and the reliability of the related development forecasts have been assessed. Particular attention has been paid to peculiarities of nanoenabled product market structure and the impact of stagnating R&D costs in the field of nanotechnology.  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