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   33560篇
  免费   420篇
  国内免费   1篇
财政金融   5812篇
工业经济   2173篇
计划管理   5308篇
经济学   7523篇
综合类   713篇
运输经济   137篇
旅游经济   259篇
贸易经济   7254篇
农业经济   835篇
经济概况   3344篇
信息产业经济   46篇
邮电经济   577篇
  2021年   94篇
  2020年   173篇
  2019年   238篇
  2018年   2608篇
  2017年   2387篇
  2016年   1531篇
  2015年   295篇
  2014年   442篇
  2013年   1779篇
  2012年   916篇
  2011年   2470篇
  2010年   2231篇
  2009年   1998篇
  2008年   1934篇
  2007年   2328篇
  2006年   486篇
  2005年   709篇
  2004年   823篇
  2003年   928篇
  2002年   635篇
  2001年   395篇
  2000年   393篇
  1999年   304篇
  1998年   325篇
  1997年   296篇
  1996年   304篇
  1995年   259篇
  1994年   275篇
  1993年   257篇
  1992年   317篇
  1991年   292篇
  1990年   249篇
  1989年   220篇
  1988年   197篇
  1987年   242篇
  1986年   249篇
  1985年   350篇
  1984年   355篇
  1983年   335篇
  1982年   318篇
  1981年   308篇
  1980年   289篇
  1979年   291篇
  1978年   216篇
  1977年   198篇
  1976年   158篇
  1975年   173篇
  1974年   138篇
  1973年   131篇
  1971年   101篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher education in South Africa is described in order to ascertain the extent of the impact. The research on which this article is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed. Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology education project in 1998. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
62.
While the dynamic theory of production provides little insight towards identifying a specific functional form for the firm's technology, dynamic production analysis has been explored traditionally in a parametric framework. A nonparametric dynamic dual cost approach to production analysis is developed in this article. Recovering technological information from intertemporal cost minimizing behavior is possible without imposing a parametric functional form on the firm's technology. Nonparametric tests to analyze the structure of a dynamic technology are presented from a dynamic cost minimizing perspective. The empirical implementation of these tests is illustrated for a balanced panel data set of Pennsylvania dairy operators during the time period 1986–1992.  相似文献   
63.
64.
Abstract The research question in the present article can be phrased in the following way: what are the elements which influence the perception of the utility of information received from another function? A field study research has been conducted in 40 Belgian companies. In each company, we have studied two on-going innovation projects (one planning project, one development project). Crossfunctional communication behaviours at the R&D/marketing interface have been measured by means of mailed structured questionnaires. Three-hundred and eighty-six questionnaires have been returned. The data analyses show that there are four underlying information dimensions, i.e. the perceived relevance, the perceived comprehensibility, the perceived novelty and the perceived credibility of information. We also discuss some contingency variables (function of the message receiver, stage in the innovation process) that might moderate the impact of these dimensions. It will be shown that the interaction between source and receiver has a significant impact on the perceived credibility, the perceived comprehensibility and the perceived novelty of the received information.  相似文献   
65.
The paper extends Manning's model on education and balanced growth to include labour immigration. Each immigration unit is assumed to consist of one skilled worker and some unskilled members. The optimal immigration policy which maximizes the per capita steady-state consumption of the host country is derived. We show that optimal immigration policy can reduce the steady-state skilled labour ratio. More interesting still, contrary to the widespread belief that immigration of skilled workers hurts local skilled workers, it is the unskilled local workers whose interests are threatened by optimal immigration policy.  相似文献   
66.
67.
68.
69.
This paper investigates India's exceptional development pattern, specifically the major importance of information technology services (ITS), and compares it with China's development pattern. Both countries want to develop capabilities for carrying out the innovation of technologies that compete at the state-of-the-art in the world market. The paper posits that technological/economic success in the contemporary world market requires the ability to innovate complex technologies and complex technology-related services. The share of trade represented by complex technologies is compared with the “high-tech” share. The trading patterns of the two countries are compared using United Nations data. Two case studies of Indian ITS companies are then compared with two case studies of Chinese manufacturing companies. Historical and cultural differences appear to explain some of the differences in the development patterns of the companies located in the two countries.  相似文献   
70.
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