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   37817篇
  免费   671篇
  国内免费   1篇
财政金融   6840篇
工业经济   2663篇
计划管理   6239篇
经济学   8426篇
综合类   703篇
运输经济   209篇
旅游经济   383篇
贸易经济   7803篇
农业经济   1175篇
经济概况   3425篇
信息产业经济   45篇
邮电经济   578篇
  2023年   119篇
  2021年   149篇
  2020年   289篇
  2019年   403篇
  2018年   2654篇
  2017年   2425篇
  2016年   1598篇
  2015年   427篇
  2014年   580篇
  2013年   2384篇
  2012年   1069篇
  2011年   2603篇
  2010年   2382篇
  2009年   2232篇
  2008年   2138篇
  2007年   2458篇
  2006年   702篇
  2005年   892篇
  2004年   973篇
  2003年   1056篇
  2002年   775篇
  2001年   518篇
  2000年   534篇
  1999年   414篇
  1998年   438篇
  1997年   426篇
  1996年   395篇
  1995年   357篇
  1994年   353篇
  1993年   333篇
  1992年   357篇
  1991年   336篇
  1990年   274篇
  1989年   244篇
  1988年   227篇
  1987年   276篇
  1986年   257篇
  1985年   362篇
  1984年   412篇
  1983年   370篇
  1982年   320篇
  1981年   302篇
  1980年   308篇
  1979年   304篇
  1978年   208篇
  1977年   196篇
  1976年   156篇
  1975年   153篇
  1974年   137篇
  1973年   134篇
排序方式: 共有10000条查询结果,搜索用时 166 毫秒
91.
92.
The increasing popularity of public private partnerships (PPPs) thrusts on to centre stage the inherent tension between accountability and transparency on the one hand, and efficiency and commerciality on the other. This paper explores a number of accountability issues that are exacerbated by a public private partnership structure. The organisational structure of a PPP, where much of the activity associated with the delivery of a public service is embedded in a private-sector entity, increases the likelihood that public scrutiny of decisions and actions is significantly inhibited  相似文献   
93.
94.
95.
The broadcasting of sport is heavily regulated. Our main findingis that common trends, and differences, in the quality, quantity,and price of televised sport across Europe and USA cannot beadequately explained without reference to policy interventionsby national and supranational government, and by competitionand regulatory authorities. These interventions have a significantimpact on the organization and governance of sports, as wellas the structure of broadcasting markets and the conduct ofbroadcasting companies. Foreclosure of broadcasting marketsthrough exclusive, long-term contracts, bundling and verticalintegration, access of viewers to major sporting events, andcollective selling stand out as the most significant policyissues. We conclude by noting a number of policy implications.  相似文献   
96.
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation of the built world and now have a diversity of form and function, including technical versions with moving parts. This article examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling. The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The article ends with a review of some of the lessons from the past and present that will need to be considered in relation to concrete modelling in schools for the future. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
97.
98.
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   
99.
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   
100.
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   
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