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   29207篇
  免费   621篇
  国内免费   14篇
财政金融   6137篇
工业经济   2152篇
计划管理   4793篇
经济学   6432篇
综合类   382篇
运输经济   163篇
旅游经济   455篇
贸易经济   4532篇
农业经济   1368篇
经济概况   3337篇
信息产业经济   2篇
邮电经济   89篇
  2021年   168篇
  2020年   344篇
  2019年   459篇
  2018年   561篇
  2017年   613篇
  2016年   576篇
  2015年   398篇
  2014年   634篇
  2013年   2936篇
  2012年   770篇
  2011年   868篇
  2010年   770篇
  2009年   847篇
  2008年   773篇
  2007年   722篇
  2006年   672篇
  2005年   565篇
  2004年   549篇
  2003年   597篇
  2002年   567篇
  2001年   576篇
  2000年   630篇
  1999年   566篇
  1998年   582篇
  1997年   562篇
  1996年   501篇
  1995年   494篇
  1994年   510篇
  1993年   509篇
  1992年   561篇
  1991年   568篇
  1990年   447篇
  1989年   384篇
  1988年   379篇
  1987年   363篇
  1986年   402篇
  1985年   563篇
  1984年   563篇
  1983年   515篇
  1982年   500篇
  1981年   498篇
  1980年   436篇
  1979年   433篇
  1978年   397篇
  1977年   307篇
  1976年   304篇
  1975年   315篇
  1974年   238篇
  1973年   248篇
  1972年   183篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
The introduction of traffic management schemes has been one response of the National Parks to the problem of ever-increasing car-borne visitors and the consequent damage caused to the rural environment. By reviewing these schemes and by determining and explaining attitudes towards one particular traffic management experiment, the paper aims to deduce lessons for future policy. The analysis, based on two visitor surveys, suggests that the likelihood of success is improved when schemes are integrated, containing both ‘carrot’ and ‘stick’ elements. Since public perceptions are also found to be pivotal to its success, appropriate marketing of a scheme is vital. The paper concludes, however, that to achieve the fundamental objective of greater accessibility with less mobility, a more wide-ranging marketing effort is required intended to engender a sea change in attitude towards both the car and public transport.  相似文献   
13.
Futures research includes the problem of generating reasonably exhaustive and plausible scenarios for a given topic, a problem for which there are no truly satisfactory solutions. This article reviews and evaluates a method, field anomaly relaxation, first put forward some 20 years ago. The evaluation is in the context of an illustrative study of political developments in Europe. The research reconstructs and further develops the method and concludes that it has something to offer for scenario generation. Its weaknesses are identified and suggestions for further research are made.  相似文献   
14.
The paper highlights the main drivers for merger policy reform in the European Union, including the consequences of the recent appeal court reverses. It discusses some of the substantive and procedural issues that the reform package should address, and outlines the reforms in progress. The author concludes that much of the reform package will be beneficial, but some important opportunities have been missed in this inevitably patchwork process.  相似文献   
15.
While folklore in finance holds that split valuation effectsare due to dividend increases associated with splits, littleis known about magnitudes of dividend and nondividend componentsof split announcement effects. We find that splits and dividendsare indeed informational substitutes, a notion we characterizemore precisely, but a significant portion of split valuationeffects, 46% according to our estimates, cannot be attributedto dividend information in splits. Our techniques extend theliterature on conditional event-study methods and we illustratetheir practical value in testing hypotheses and analyzing datanot amenable to analysis by standard procedures.  相似文献   
16.
17.
18.
The current progress of electrification in Russia is clearly insufficient compared with G8 countries. At the same time, economy sectors have a high potential for energy saving. The electricity consumption of households depends on their cash income and the growth rate of electricity tariffs.  相似文献   
19.
There are two variance components embedded in the returns constructed using high frequency asset prices: the time-varying variance of the unobservable efficient returns that would prevail in a frictionless economy and the variance of the equally unobservable microstructure noise. Using sample moments of high frequency return data recorded at different frequencies, we provide a simple and robust technique to identify both variance components.  相似文献   
20.
Previous research finds that large companies previously judged to be excellent growth companies have subsequently been poor investments. We examine small companies selected by Business Week on the basis of multiple criteria used in annual articles featuring highly rated growth companies. We study the investment performance over the three years before eleven annual Business Week publications and the three years after publication. We find positive excess returns in the pre‐publication period, but negative excess returns in the post‐publication period. This reversal in investment performance appears to be due to a mean‐reversion tendency in operating performance, in which the earnings and the past rates of return on capital of such companies subsequently decrease significantly.  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