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   131513篇
  免费   3752篇
  国内免费   1篇
财政金融   25054篇
工业经济   11039篇
计划管理   21105篇
经济学   28224篇
综合类   1420篇
运输经济   953篇
旅游经济   2476篇
贸易经济   22301篇
农业经济   6015篇
经济概况   16434篇
信息产业经济   7篇
邮电经济   238篇
  2021年   815篇
  2020年   1601篇
  2019年   2358篇
  2018年   2215篇
  2017年   2398篇
  2016年   2621篇
  2015年   2064篇
  2014年   3378篇
  2013年   15178篇
  2012年   4152篇
  2011年   4006篇
  2010年   3609篇
  2009年   4225篇
  2008年   3799篇
  2007年   3122篇
  2006年   3523篇
  2005年   3500篇
  2004年   3047篇
  2003年   2809篇
  2002年   2799篇
  2001年   2553篇
  2000年   2462篇
  1999年   2377篇
  1998年   2224篇
  1997年   2280篇
  1996年   2141篇
  1995年   1940篇
  1994年   1962篇
  1993年   1923篇
  1992年   1970篇
  1991年   1767篇
  1990年   1658篇
  1989年   1535篇
  1988年   1467篇
  1987年   1484篇
  1986年   1557篇
  1985年   2307篇
  1984年   2188篇
  1983年   1988篇
  1982年   1857篇
  1981年   1847篇
  1980年   1806篇
  1979年   1715篇
  1978年   1564篇
  1977年   1571篇
  1976年   1334篇
  1975年   1229篇
  1974年   1153篇
  1973年   1147篇
  1972年   860篇
排序方式: 共有10000条查询结果,搜索用时 437 毫秒
991.
992.
993.
994.
The first objective of this article is to clarify which model best captures the structure and trend of the influence of social origin on children's education. The second objective is to analyse how general conclusions on historical trends in educational reproduction change if we add mother's status background to the model. Six contrasting hypotheses are derived fromthe body of literature dealing with models on families' socioeconomic status. All hypotheses are translated into empirical models and their explained variance is compared. A pooled data set is used that contains data from the Netherlands, West Germany, and the USA. The Modified Dominance Model, that distinguishes the influence of the highest from thelowest status parent, has the best model fit. Regarding the second objective we see that adding the mother's influence to that of the father's does not change general conclusions on trends in educational reproduction. Over time the influence of both parents decreases continuously. However, the influence of the mother's education and occupational status on children's educational attainment is substantive.  相似文献   
995.
Address delivered at a session on April 2, 1993 at the Midwest regional meetings of the Association for Social Economics, Indianapolis, IN.  相似文献   
996.
The paper hypothesizes that diversification by firms based in the pharmaceutical industry during the 1977-86 time period was primarily undertaken to reduce the risks associated with being dependent upon a technologically dynamic environment. Consistent with this non-efficiency motive for diversification, declining economic performance is predicted. A longitudinal empirical analysis provides support for these propositions.  相似文献   
997.
998.
To compete effectively, multi-national enterprises (MNEs) must establish market presence in their global rivals' home courts and/or profit sanctuaries. Technology transfer is often used as a means toward that end. The technology adoption decisions of an aggressor MNE and a defender MNE are investigated in a model that features indirect moves and changes in strategy through technology transfer. Each firm may adopt a strategy that incorporates the transfer of high technology or appropriate technology. The strategic decision situation is modelled as a closed-loop sequential equilibrium in discrete time. In contrast to results in the technology adoption literature, the aggressor MNE may successfully transfer technology first, to be imitated later by the defender MNE. This and several other scenarios emerge from the model which, by incorporating the cost of social adjustment and risks involved in technology transfer, ties technology to the competitive interaction of MNEs and specifies conditions for creating competitive advantage through technology, both locally and worldwide.  相似文献   
999.
An extensive set of self-reported survey data exists on illegal drug use. The survey data show that drug use is quite frequent among the younger adult population, relatively infrequent among those of high-school age, and rare among middle-aged and older adults. Drug use varies by occupational category in ways that are difficult to rationalize. This study utilizes a model in which an individual's time is allocated among labor, non-drug consumption, leisure, and drug use, where the individual is cognizant of the effect of drug use on his wages. The study analyzes comparative static results and then uses data from the National Longitudinal Survey of Youth to estimate a probit model of the individual decision to use drugs. The findings of the study are that non-economic factors dominate the decision for both harder drugs and drugs more broadly defined. One must consider this finding tentative, however, since usable drug price data were not available.  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