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   3804篇
  免费   187篇
  2023年   29篇
  2020年   92篇
  2019年   78篇
  2018年   164篇
  2017年   166篇
  2016年   155篇
  2015年   106篇
  2014年   106篇
  2013年   1172篇
  2012年   102篇
  2011年   120篇
  2010年   84篇
  2009年   77篇
  2008年   73篇
  2007年   61篇
  2006年   57篇
  2005年   40篇
  2004年   37篇
  2003年   33篇
  2002年   42篇
  2001年   42篇
  2000年   50篇
  1999年   47篇
  1998年   39篇
  1997年   34篇
  1996年   36篇
  1995年   35篇
  1994年   21篇
  1993年   28篇
  1992年   26篇
  1991年   35篇
  1990年   26篇
  1989年   34篇
  1988年   29篇
  1987年   29篇
  1986年   36篇
  1985年   41篇
  1984年   29篇
  1983年   35篇
  1982年   27篇
  1981年   40篇
  1980年   35篇
  1979年   35篇
  1978年   36篇
  1977年   26篇
  1976年   32篇
  1975年   24篇
  1973年   27篇
  1972年   22篇
  1969年   22篇
排序方式: 共有3991条查询结果,搜索用时 15 毫秒
91.
92.
93.
ABSTRACT. This paper uses new estimates of metropolitan factor demand and output supply functions to study how federal, state, and local fiscal policies affect metropolitan economies. We illustrate our work with findings for ten metropolitan areas in five states for changes in state corporate income taxes, local property taxes, the federal corporate income tax, an investment tax credit, interest rates, public capital stocks, output prices, and tax and regulatory policies affecting gross wages. It is clear from these simulations that a policy that is nominally the same everywhere will have repercussions that vary widely across regions and cities.  相似文献   
94.
95.
96.
K. B. PERSSON 《Archaeometry》1997,39(2):441-443
A new method for soil phosphate analysis has been developed for field measurement which will increase the applicability of phosphate mapping in archaeological prospection.  相似文献   
97.
Some 630 Roman silver coins excavated at Augusta Raurica (Switzerland) have been analysed by non-destructive X-ray fluorescence and X-ray diffraction. Furthermore, the density and the weight have been determined. The measured average density of plated and massive depletion-silvered coins is lower than the density calculated from the chemical composition, whereas massive coins display equal values for both of the densities. Based on experimental X-ray investigations of modern silver (tempering, acid treatment, production of corrosion layers), the nature of corrosion products on silver, their impact on surface analysis, and aspects of wearing-off by circulation are briefly discussed.  相似文献   
98.
The present paper surveys the discussions conducted by official statisticians regarding the ideal structure according to which a national data collection system should have been designed if it was to meet the challenges put up by the various transformation Western countries have undergone since the beginning of the 19th century. Arguments in favour of coordination, centralization, or decentralization have emerged for the first time in 1832 Britain, when the Statistical Bureau of the Board of Trade was created. Up to 1945, this debate went on, the industrial take-off, the economic crises, and the world wars all being occasions for its protagonists to put forward their preferred view. The perspective we take here is original in two respects: on the one hand, instead of confining ourselves to the major statistical systems (those of France, Britain, and the USA), we intend to evoke a large number of cases and, from this comparative standpoint, propose a general account of the drive towards centralization; on the other hand, instead of restraining our-selves to the 19th century, we cover the entire time-frame extending from 1800 to 1945.  相似文献   
99.
100.
Senator George Sigerson (1836-1925), Dublin's first neurologist, was also a significant contributor to Anglo-Irish literature. His medical career and literary accomplishments are outlined, the focus of the article being Sigerson's friendly relationship with Charcot (with whom he corresponded), and whose Le?ons sur les maladies du système nerveux he translated.  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