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   14367篇
  免费   815篇
  国内免费   229篇
财政金融   1236篇
工业经济   777篇
计划管理   2857篇
经济学   2782篇
综合类   1305篇
运输经济   228篇
旅游经济   511篇
贸易经济   2944篇
农业经济   1136篇
经济概况   1635篇
  2024年   76篇
  2023年   316篇
  2022年   284篇
  2021年   484篇
  2020年   616篇
  2019年   560篇
  2018年   521篇
  2017年   619篇
  2016年   539篇
  2015年   497篇
  2014年   757篇
  2013年   1416篇
  2012年   1026篇
  2011年   1163篇
  2010年   827篇
  2009年   650篇
  2008年   1094篇
  2007年   899篇
  2006年   818篇
  2005年   631篇
  2004年   433篇
  2003年   318篇
  2002年   210篇
  2001年   161篇
  2000年   116篇
  1999年   85篇
  1998年   63篇
  1997年   59篇
  1996年   43篇
  1995年   25篇
  1994年   18篇
  1993年   13篇
  1992年   12篇
  1991年   8篇
  1990年   6篇
  1989年   4篇
  1988年   5篇
  1987年   2篇
  1986年   4篇
  1985年   5篇
  1984年   5篇
  1983年   7篇
  1982年   6篇
  1981年   7篇
  1980年   1篇
  1979年   1篇
  1973年   1篇
排序方式: 共有10000条查询结果,搜索用时 968 毫秒
41.
谢宏维 《中国农史》2003,22(2):116-122
从明后期开始进入徽州地区的外地棚民,利用当地丰富的自然资源,进行各种经济活动。在当时的社会条件制约下,此类经济活动耗费了大量的资源,破坏了徽州农村的生态环境,损害了地方和国家的利益。针对这一问题,清代徽州乡村社会各种民间力量和官方联合展开了一场声势浩大的驱禁棚民运动,取得了预期效果。  相似文献   
42.
本文综述了混合拉曼/掺饵光纤放大器(HFA)的工作原理,结构和特点,介绍了4类HFA基本结构及其实验结果,并通过介绍近年来各类HFA在密集波分复用(DWDM)系统中的应用表明了HFA在带宽,增益和噪声特性方面的优点。  相似文献   
43.
In this paper we develop a vintage model to gain a better understanding of the semiconductor industry and its role in recent U.S. productivity gains. Unlike previous work, in our model the observed price declines of individual chips are driven by the introduction of better vintages rather than by learning economies. Dominated chips, nonetheless, continue to be produced, for a time, due to sunk investments in chip‐specific production equipment. The model lends partial support to Jorgenson's hypothesis that an exogenous increase in Moore's Law could have generated the more rapid price declines, and faster productivity growth, seen after 1995.  相似文献   
44.
This paper is based on the traditional Austrian Theory of Capital which deals with expected values of future returns of investments over various periods of time. The longer the time period that elapses between the beginning of a production process and its end, the higher the (expected) productivity must be due to positive time preferences of individuals. This paper focuses on the uncertainty of future returns and on uncertainty preferences, instead. Based on the Hayekian idea of the dispersion of knowledge in society, it will be shown that there is a systematic relationship between the structure of capital and uncertainty. This result will be derived for a production process characterized by complete vertical integration and one which is not completely vertically integrated. The distinction between these two settings is crucial, if one accepts the distinction between an individual and a social period of production and the planning horizon which are introduced in this paper.  相似文献   
45.
当前我国货币政策传导机制不顺畅,其主要原因是:需求不足制约了中央银行货币供给,经济实体经济结构与金融经济结构的不对称阻碍了货币政策传导的信贷渠道,传导机制的机构活力不足,金融市场发育不成熟使货币政策实施的有效空间减少,等等。因此,必须认真研究提高货币政策传导效率的途径,使中央银行货币政策意图顺利实现。  相似文献   
46.
如何看待我国民营上市公司EVA与MVA的反差问题   总被引:1,自引:0,他引:1  
张磊 《商业研究》2004,(4):107-109
通过对2001年EVA与MVA反差最大的20家民营企业的统计数据进行了相关分析与因子分析,提出使用第一主成分作为投机炒作的度量,弟二主成分反映了股本与业绩的背离程度,并对2001年EVA与MVA反差最大的20家企业进行分析并排序。  相似文献   
47.
Advances in technology have impacted accounting careers with resulting changes in where, when and how accountants perform their job duties. In addition, employee attitudes towards, and need for, better work/life balance has led to more firms offering alternate work arrangements (AWA). Research suggests that AWA programs can lead to many benefits for both employers and employees. Despite the prevalence of these programs there are relatively few accountants working under these arrangements and concerns about work/life balance continue. This study examines factors that shape perceptions of the cost and benefits associated with the adoption and/or support of AWAs across work culture, gender and participation experience. Our results suggest that work environment had a significant effect on perceptions of AWAs. Public accountants perceived greater costs related to career advancement but correspondingly less concern about administrative issues than management accountants. We also found that accountants who have participated (or are currently participating in an AWA), perceived greater benefits and less concern for potential negative consequences to their careers than non-participants. Finally, women perceived greater benefits to result from participation in an AWA and men perceived correspondingly more costs. Regardless, both genders perceived that AWAs were not strictly a women's issue. These findings contribute to our understanding of alternate work arrangements and point to factors that must be addressed to increase the acceptance and success of these programs.  相似文献   
48.
介绍了未来高速移动通信新标准IEEE802.20的总体概况,具体分析了IEEE802.20的技术特性、系统参考结构以及系统的组成模型,并对IEEE802.20标准前景分析与展望进行了详细描述。  相似文献   
49.
The principal aim of this paper is to evaluate the impact of the future European high-speed train network on accessibility, by reducing time distance between places and modifying their relative location. We compare the current situation with that foreseen for the year 2010, according to the Outline Plan of the European High-Speed Train Network, in order to analyse which areas will most benefit from construction and improvement of the infrastructure. It is hypothesized that the high-speed train will certainly bring the peripheral regions closer to the central ones, but will also increase imbalances between the main cities and their hinterlands. A weighted average distance indicator is applied for this purpose. This measure identifies the spatial distribution of accessibility in the area of study, emphasizing the infrastructure effects, and locates accessibility changes at the European level. A Geographic Information System (GIS) has been used to carry out this study.  相似文献   
50.
本文首先讲述了ITS中的2种通信技术——专用短程通信(DSRC)和蜂窝数字分组数据网(CDPD)的基本概念、工作原理及系统特点等,然后提出了一种基本这2种通信技术的先进公交系统,并对各个子系统的功能结构进行了描述。  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