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   77篇
  免费   1篇
  78篇
  2023年   2篇
  2021年   1篇
  2020年   1篇
  2019年   2篇
  2018年   4篇
  2017年   1篇
  2016年   3篇
  2015年   2篇
  2014年   5篇
  2013年   15篇
  2012年   4篇
  2011年   1篇
  2010年   1篇
  2009年   4篇
  2008年   2篇
  2007年   2篇
  2006年   1篇
  2005年   3篇
  2003年   1篇
  2002年   3篇
  1999年   2篇
  1998年   1篇
  1996年   1篇
  1993年   1篇
  1990年   1篇
  1989年   2篇
  1987年   2篇
  1985年   1篇
  1984年   3篇
  1982年   3篇
  1981年   2篇
  1970年   1篇
排序方式: 共有78条查询结果,搜索用时 15 毫秒
11.
12.
Economic measurement tools allow a quantification of social differences not only for modern societies, but also for prehistoric communities. The use of Gini indices and Lorenz curves for the much discussed Chalcolithic cemetery of Durankulak (Bulgaria) indicates an average increase in material items from 5000 cal BC onwards and a tendency of these items to be distributed somewhat more equally. Towards the end of the Chalcolithic sequence, however, strongly growing inequality was associated with lower average welfare. The steep increase in social inequality might be one of the main reasons for the collapse of Chalcolithic societies around 4100 cal BC in Durankulak, but also in other South East European regions.  相似文献   
13.
The World Heritage Site of Bryggen in Bergen, Norway, has experienced significant degradation of archaeological deposits as a consequence of changes in the soil water and groundwater balance after urban redevelopment adjacent to the heritage site. Additionally, groundwater temperatures below the heritage site were found to be significantly higher closer to the redeveloped area. One of the main mitigation measures taken to reduce the degradation of the archaeology has been the construction of a hydrological barrier along the sheet piling that divides the redeveloped area and the historic site. A shallow subsurface infiltration system was designed to achieve groundwater levels and flow conditions that are optimal for the preservation of archaeological remains directly along the sheet pile, while reducing drainage and subsidence also further upstream. Monitoring of groundwater level and temperatures after implementation of the hydrological barrier shows that groundwater levels and flow conditions have improved with respect to optimal preservation conditions, and groundwater temperatures have generally been reduced by up to 2 °C.  相似文献   
14.
The shallow subsurface in historic cities often contains extensive archaeological remains, also known as cultural deposits. Preservation conditions for naturally degradable archaeological remains are strongly dependent on the presence or absence of groundwater. One of the main goals at such heritage sites is to establish a stable hydrological environment. Green infrastructural solutions such as Sustainable Urban Drainage Systems (SUDS) can support preservation of cultural deposits. Several cases show that implementation of SUDS can be cost effective at preservation of cultural deposits. These include Motte of Montferland, City mound of Vlaardingen, Weiwerd in Delfzijl, and the Leidse Rijn area. In all cases, the amount of underground infrastructure is minimised to prevent damaging cultural layers. SUDS have been implemented to preserve cultural heritage. The first monitoring results and evaluation of the processes give valuable lessons learned, transnational knowledge exchange is an important element to bring the experiences across boundaries.  相似文献   
15.
16.
17.
Weber  Johannes 《German history》2006,24(3):387-412
English-language examinations of the history of the press oftenbegin with the 1620s or the 1640s, when this new medium beganto be more widespread in England. On the continent, however,around the year 1600 all the necessary technical, infrastructuraland communication elements were already in place for the developmentof the modern newspaper. Book-printing techniques enabled themass production of news reports; a regular relay post system,available to the general public, served the needs of a networkof professional correspondents from around the world. The timewas right for the first periodical news sheet, which appearedin Strassburg in 1605. The change from hand-copied to printednewspapers was of far-reaching significance, as the mass circulationof news gave regular publicity to the events and personalitiesof political life. By the 1620s a variety of newspapers werecirculating in central Europe, and in the second half of theseventeenth century newspapers were the most widely read secularmaterial. They provided a seedbed for the broadening politicaleducation which fostered the development of the Enlightenment.  相似文献   
18.
Water and ocean     
Indo-Iranian Journal -  相似文献   
19.
20.
Toward a relational economic geography   总被引:10,自引:0,他引:10  
In this paper, we argue that a paradigmatic shift is occurringin economic geography toward a relational economic geography.This rests on three propositions. First, from a structural perspectiveeconomic actors are situated in contexts of social and institutionalrelations. Second, in dynamic perspective economic processesare path-dependent, constrained by history. Third, economicprocesses are contingent in that the agents' strategies andactions are open-ended. Drawing on Storper's holy trinity, wedefine four ions as the basis for analysis in economic geography:organization, evolution, innovation, and interaction. Therein,we employ a particular spatial perspective of economic processesusing a geographical lens.  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