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   147篇
  免费   11篇
  2023年   2篇
  2020年   4篇
  2019年   6篇
  2018年   5篇
  2017年   4篇
  2016年   7篇
  2015年   10篇
  2014年   4篇
  2013年   31篇
  2012年   5篇
  2011年   5篇
  2010年   6篇
  2009年   6篇
  2007年   6篇
  2006年   2篇
  2005年   4篇
  2004年   4篇
  2003年   1篇
  2002年   7篇
  2001年   3篇
  2000年   4篇
  1999年   2篇
  1998年   3篇
  1997年   4篇
  1995年   1篇
  1994年   2篇
  1993年   2篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1987年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1979年   2篇
  1978年   1篇
  1977年   1篇
  1976年   1篇
  1973年   1篇
  1971年   1篇
  1965年   1篇
  1957年   1篇
排序方式: 共有158条查询结果,搜索用时 15 毫秒
21.
22.
23.
Schmidt, R., March 2007. Australian Cenozoic Bryozoa, 2: Free-living Cheilostomata of the Eocene St. Vincent Basin, S.A., including Bonellina gen. nov. Alcheringa 31, 67-84. ISSN 0311-5518.

Free-living bryozoans are diverse in the Eocene sediments of the St. Vincent Basin, South Australia. They include Bonellina pentagonalis gen. et sp. nov., Otionellina sp. cf. O. exigua (Tenison Woods), Otionellina sp. cf. O. cupola (Tenison Woods), Tubiporella magna (Tenison Woods), Celleporaria nummularia (Tenison Woods), and an indeterminate species only found as moulds. This diversity and abundance is highest in the sediments representing the initial transgressive marine facies, where they occur in ‘sand fauna’ bryozoan assemblages (e.g. with Melicerita and Siphonicytara). Free-living bryozoans decrease up-section and are absent from latest Eocene sediments, indicating a significant environmental shift.

Rolf Schmidt [rschmid@museum.vic.gov.au], Museum Victoria, Melbourne, Vic 3001, Australia; received 18.3.2005, revised 14.12.2005.  相似文献   
24.
Our paper summarizes some of the main results of the European Regional Innovation Survey (ERIS) as far as they are discussed in this special issue of European Planning Studies . The overall target of the ERIS project is a quantitative and qualitative assessment of determinants crucial for the innovation potential of any region, i.e. innovative and non-innovative manufacturing firms, business services and research institutions, as well as the innovative linkages and networks between these actors. Empirical research is based upon almost 8600 questionnaires collected in 11 European regions. Results confirm some of the common hypotheses on the relationship between space and innovation networks but others are contrary to existing scientific knowledge. Obviously the impact of national innovation systems on the innovation activities of manufacturing firms in a given European region is-at least-as strong as the impact of the respective regional innovation system. The spatial range of innovative linkages significantly depends on the size, the type of the cooperation partner, the R&D intensity and the industry of the analysed manufacturing firm. For example, the higher the technology intensity of the industry, the greater is the need of each firm to use intraregional knowledge via innovation linkages. It is therefore an important task in regional innovation policy to promote network-building among firms and other actors of a regional innovation system and to interlink these intraregional networks with national and international knowledge sources.  相似文献   
25.
26.
27.
28.
A major problem facing North American approaches to historical archaeology is the exclusionary manner in which the discipline is defined. By confining historical archaeology to the era of capitalism and colonialism, we declare that the indigenous histories of many areas of the globe are of no interest to such an intellectual agenda. If we practice an historical archaeology that only valorizes the colonial experience, then what happens to history making that engaged cultures in the pre-capitalist and pre-modern era? Such approaches separate the histories of people in Africa from those of the West, and, is in effect, academic apartheid. To remedy this disjuncture, we interrogate how historical archaeology may escape the bounds of implicit racism in its denial of historicity before literacy. We suggest that breaking the chains of exclusion is the only way to realize an inclusive archaeology sensitive to all history making projects.  相似文献   
29.
30.
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