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   2008篇
  免费   27篇
  2035篇
  2021年   12篇
  2020年   24篇
  2019年   36篇
  2018年   47篇
  2017年   42篇
  2016年   69篇
  2015年   41篇
  2014年   38篇
  2013年   551篇
  2012年   70篇
  2011年   73篇
  2010年   67篇
  2009年   71篇
  2008年   47篇
  2007年   65篇
  2006年   58篇
  2005年   28篇
  2004年   22篇
  2003年   19篇
  2002年   18篇
  2001年   19篇
  2000年   16篇
  1999年   28篇
  1998年   13篇
  1997年   15篇
  1996年   18篇
  1995年   17篇
  1994年   12篇
  1993年   19篇
  1992年   17篇
  1991年   23篇
  1988年   18篇
  1987年   19篇
  1986年   23篇
  1985年   17篇
  1984年   18篇
  1983年   19篇
  1982年   25篇
  1981年   19篇
  1980年   15篇
  1979年   16篇
  1978年   18篇
  1977年   15篇
  1976年   15篇
  1975年   16篇
  1973年   12篇
  1970年   16篇
  1969年   14篇
  1968年   12篇
  1967年   17篇
排序方式: 共有2035条查询结果,搜索用时 0 毫秒
61.
This paper identifies four triggers that underpinned the late 20th century reform of coastal management in Australia. These have operated across federal, state and local levels of government. The triggers are global environmental change, sustainable development, integrated resource management, and community awareness of management issues and participation in decision making. This reform has been driven by international and national forces. A number of inquiries into coastal management in Australia culminated in the production of a national coastal policy in 1995. This has led to fundamental changes in coastal management and to the recognition of the inevitability of changes in coastal systems. Federal policies and programs are being translated into action at the state and local government levels through a variety of funding mechanisms and programs. These involve capacity building, a memorandum of understanding between all levels of government, an enhanced role for state advisory or co‐ordinating bodies, and an increased role for public participation.  相似文献   
62.
A. N. SHUGAR 《Archaeometry》2000,42(2):375-384
This paper presents the results of analysis of Byzantine opaque red glass tesserae derived from three separate locations in the ancient city of Beit Shean, Israel. Investigation proceeded using reflective light microscopy, energy dispersive X‐ray fluorescence and energy dispersive scanning electron microscopy. The glass matrix of the tesserae was found to be heterogeneous, with many inclusions. Similarities and differences between tesserae from the two mosaics are examined and discussed. Implications for locale of manufacture and production techniques are considered. Comparisons between the three locations led to conclusions about the use of the tunnel as a storage site and the implications of this for future research on mosaics.  相似文献   
63.
64.
Summary. This paper describes a study of neutron activation analyses of some medieval tiles from the North Midlands. Having established the feasibility of the method of analysis, we applied a number of multivariate statistical techniques to derive eleven reference groups, each consisting of tiles with similar compositions which could plausibly have originated from the same source of clay. While known kiln sites could be readily distinguished, less confidence could be placed on the results where it was suspected that several sources had been mixed. Design information on the tiles when combined with the analytical results has led to the conclusion that stamps may have been passed from one tilery to another, though in some cases the tiles themselves were moved. The reference groups have proved to be useful in our continuing research on the composition of tiles from this area.  相似文献   
65.
66.
67.
68.
69.
Discrete-choice theory and logit models are evaluated for their usefulness in analyzing migration patterns in a zonal system. The authors "argue that spatial effects and more specifically the relative location of zones are not taken into account in such analyses. We, therefore, introduce a measure of spatial structure and advocate its usage as a predictor of migration in such models. In an example of intrametropolitan migration in Toronto [Canada], we demonstrate that this variable is not only significant but also it improves the performance of all the other variables with the greatest impact on the distance between zones. In addition, inclusion of this variable improves the overall performance of the model in terms of residuals."  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