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   129篇
  免费   9篇
  2024年   1篇
  2023年   2篇
  2021年   1篇
  2020年   1篇
  2019年   5篇
  2018年   6篇
  2017年   10篇
  2016年   9篇
  2015年   7篇
  2014年   6篇
  2013年   15篇
  2012年   5篇
  2011年   5篇
  2010年   6篇
  2009年   2篇
  2008年   6篇
  2007年   2篇
  2006年   4篇
  2005年   6篇
  2004年   2篇
  2003年   5篇
  2002年   3篇
  2001年   3篇
  2000年   3篇
  1999年   1篇
  1998年   1篇
  1997年   1篇
  1996年   3篇
  1995年   1篇
  1994年   4篇
  1993年   1篇
  1992年   2篇
  1991年   1篇
  1990年   3篇
  1988年   4篇
  1985年   1篇
排序方式: 共有138条查询结果,搜索用时 15 毫秒
81.
In recent years, the strategic role certain metals play is seen as central to the geopolitics promulgated by state agents in the North. While a switch to renewable energy and an increase in energy efficiency might be instrumental to reducing dependence on fossil energy, it increases dependence on metals. This paper starts from an analysis of the likely availability of metals in the near future and then proceeds to investigate political concerns raised by considering the geological fundamentals of social development at the peripheries of the capitalist world‐system. The inequality of metal stocks, future metal requirements and the ensuing political challenges are investigated, taking copper as an example. The final section is dedicated to the discussion of regulatory challenges in view of multiple constraints on metal extraction. This section also highlights the preconditions of a socially legitimate transition to a renewable energy system in the coming period of socio‐ecological transformation.  相似文献   
82.
83.
This paper presents the preliminary results of a survey project which is being carried out in the small village of Fatschenbrunn, in Lower Franconia, Germany. The project combines archaeological, historical geographical, botanical, geological and pedological data to reconstruct the farming regimes and land use in the late medieval and post-medieval era. Although the project is still on-going, the collected data allows the formulation of hypotheses on the formation of fertile agricultural soils through long-term human intervention in the past.  相似文献   
84.
85.
The Lectureships for Swedish in Germany in the Context of Cultural Diplomacy 1917–1930. During the Weimar Republic a significant number of lectureships for Swedish was established at German universities. This paper attempts to explain this development through an analysis of the political and academic context of these establishments. Focussing on the actors involved the lectureships are linked to the emerging interest of the German state for public diplomacy emerging after World War I and the following reactions of German academia. The paper also treats the importance of the main Swedish actor, namely the association for the preservance of Swedishness abroad for the establishments of the lectureships. At the end the different actors working for Swedish lectureships in Germany are placed in a broader European context and questions concerning the relationship between universities and cultural diplomacy are raised and answered.  相似文献   
86.
During the restoration of the Radium cinema located in the old Town of Zürich, a stratigraphic sequence of medieval fireplaces came to light. Based on ceramic finds, a preliminary age of about 1000 AD was assigned. In this paper we show the results from archaeomagnetic and radiocarbon dating, which combined with the stratigraphic information yield a better constrain of the period of use of these fireplaces. Whilst the radiocarbon technique continues to be the most widespread methodology for dating young archeological artifacts, archaeomagnetic dating is becoming increasingly more established in Europe thanks to the increased number of available measurements. A Bayesian model on the period of use of these fireplaces was produced with OxCal, by a combination of magnetic and radiocarbon ages, together with the stratigraphic information. The results show that the fireplaces were probably used during 1 to 2 generations (e.g. 20–40 years each), and are in good agreement with the archaeological context of this site. To make use of the magnetic measurements for future reconstructions of the field, we carried out an additional age model using only the radiocarbon and the stratigraphic information. Although some of the structures show large directional scatter due to poor baking in antiquity, the results confirm the trend of the geomagnetic field around 1000 AD.  相似文献   
87.
88.
89.
90.
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