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   66篇
  免费   2篇
  68篇
  2020年   1篇
  2019年   2篇
  2018年   1篇
  2017年   5篇
  2016年   3篇
  2015年   2篇
  2014年   5篇
  2013年   14篇
  2012年   1篇
  2011年   2篇
  2010年   1篇
  2009年   2篇
  2008年   2篇
  2007年   1篇
  2006年   1篇
  2004年   2篇
  2003年   1篇
  2002年   2篇
  2000年   2篇
  1999年   2篇
  1998年   1篇
  1997年   2篇
  1996年   1篇
  1995年   2篇
  1993年   2篇
  1986年   1篇
  1983年   1篇
  1982年   1篇
  1980年   1篇
  1978年   1篇
  1972年   2篇
  1970年   1篇
排序方式: 共有68条查询结果,搜索用时 0 毫秒
11.
12.
13.
14.
15.
16.
    
  相似文献   
17.
    
We examine a range of paleoclimatic evidence covering approximately the last 2000 years (the Common Era) to provide plausible environmental scenarios as potential drivers and stressors associated with major societal disruption in different parts of the world. The period studied covers both historical, for which there is documentary evidence of impacts, and prehistorical events, for which impacts are inferred from the archeological record. Drought appears to be the most common high‐impact stressor in the historical and prehistorical records. Clearly, the adequacy of water supplies for growing food and for an array of other uses is a thread that weaves its way across time and societies. We also briefly outline some of the key physical mechanisms leading to climatic changes of a magnitude that could have led to societal disruptions. These include solar variability and large explosive volcanic eruptions, both of which affect the amount of radiant energy available to the Earth's climate system, as well as the natural internal variability of the climate system. We emphasize that climatic changes alone are unlikely to be the sole determinant cause of a given society's response – whether abandonment of settlements or bellicose action against its own members or neighbors. Often, the natural hazard is simply a catalyst for actions whose groundwork had been set in motion for some time prior. In many cases, appropriate mitigation to reduce vulnerability and efforts to enhance a society's adaptive capacity might have been enough to prevent the most extreme consequences of the nature's extremes. In that vein, we point to current conditions in the western United States, where a complex mix of past and current actions together with a rapidly changing climate are causing a plethora of problems whose solution will demand creative collaborative actions at all levels of society.  相似文献   
18.
    
Historians of the early Middle Ages (c. 600–c. 1050) have long used material remains and archeological evidence to learn about that era. Over the last four decades, material culture studies have become a prominent area of historical research, particularly for cultural historians. Recent early medieval studies have followed this trend. In addition, religious and economic studies of the so‐called “Dark Ages” have drawn from material sources. Object‐driven social history has been less popular, but recent work, especially on Francia and Anglo‐Saxon England, demonstrates that such projects offer new findings on a period whose texts rarely address social relations and everyday life directly. Material culture therefore offers rich research possibilities for early medieval social history.  相似文献   
19.
20.
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