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   522篇
  免费   14篇
  536篇
  2021年   4篇
  2020年   7篇
  2019年   12篇
  2018年   18篇
  2017年   17篇
  2016年   20篇
  2015年   14篇
  2014年   12篇
  2013年   142篇
  2012年   12篇
  2011年   9篇
  2010年   15篇
  2009年   10篇
  2008年   11篇
  2007年   9篇
  2006年   5篇
  2005年   10篇
  2004年   12篇
  2003年   11篇
  2002年   7篇
  2001年   10篇
  2000年   10篇
  1999年   6篇
  1998年   10篇
  1997年   5篇
  1995年   6篇
  1994年   5篇
  1993年   7篇
  1992年   3篇
  1990年   4篇
  1989年   3篇
  1988年   2篇
  1987年   6篇
  1986年   3篇
  1985年   6篇
  1984年   7篇
  1983年   11篇
  1982年   9篇
  1981年   4篇
  1980年   3篇
  1979年   6篇
  1978年   9篇
  1977年   11篇
  1976年   4篇
  1975年   7篇
  1974年   3篇
  1971年   5篇
  1970年   2篇
  1969年   3篇
  1968年   2篇
排序方式: 共有536条查询结果,搜索用时 0 毫秒
61.
The Himalayas are among the world's youngest mountain ranges. In addition to the geologic processes of mountain building and erosion, they are also highly vulnerable to human influenced change, occurring at local, national, regional, and international scales. A photo-elicitation methodology is employed to show how residents perceive those changes from historical perspectives, as well as their current conditions and impacts on their daily lives. Nepal's Khumbu region has undergone major social and environmental transformations since the 1960s when international trekking first began to influence the area's economy. The current perceptions of Khumbu residents of these changes are assessed through photo-elicitation interviews. Their responses are placed in the historical context of: (1) institutional and political changes, most of which have been driven by national government policies; (2) social and economic changes, for which the tourism economy has been central; and (3) environmental changes, reflecting the impacts of resource management and climate change. The mostly positive perceptions of Khumbu residents toward how their region has changed reflects general improvements in the physical and cultural landscapes of the Khumbu over time, as well as its continuing geographic isolation, which has helped to slow the rate of globalization, while also keeping the region a dynamic and popular tourist destination.  相似文献   
62.
63.
64.
Reviews of books     
Historical Archaeology -  相似文献   
65.
Tocqueville Unveiled : The Historian and His Sources for The Old Regime and the Revolution . By Robert T. Gannett Jr.  相似文献   
66.
Optimal Sampling Design for Variables with Varying Spatial Importance   总被引:1,自引:0,他引:1  
It is often desirable to sample in those locations where uncertainty associated with a variable is highest. However, the importance of knowing the variable's value may vary across space. We are interested in the spatial distribution of Received Signal Strength Indicator (RSSI), a measure of the signal strength from a cell tower received at a particular location. It is crucial to estimate RSSI values accurately in order to evaluate the effectiveness of mayday systems designed for rapid emergency notification following vehicle crashes. RSSI estimation is less important for locations where the probability of a crash is low and where the likelihood of call completion is either close to zero or one. We develop a method for augmenting an initial spatial sample of RSSI values to achieve a high‐precision estimate of the probability of call completion following a crash. We illustrate the approach using data on RSSI and vehicle crashes in Erie County, NY.  相似文献   
67.
Differing interpretations regarding the organization of past intensive farming are often distinguished as “top-down” or “bottom-up” perspectives. The development of intensive farming and its social organization are attributed to either nascent states and centralized governments or the incremental work of local communities or kin-based groups. We address the social organization of raised field farming in one region of the Lake Titicaca Basin of the Andean altiplano, Bolivia. We evaluate past research in the Katari Valley, including our own, based on recent settlement survey, excavation, and a variety of analyses. Taking a long-term perspective covering 2500 years, we find that relations of production and rural organization changed greatly over time in relation to changing sociopolitical conditions. Local communities played dynamic roles in the development and organization of raised field farming, yet its intensification and ultimate recession were keyed to the consolidation and decline of the Tiwanaku state. We conclude that the top-down/bottom-up dichotomy is overdrawn. Local communities and their productive practices never operated in a political or economic vacuum but both shaped and were transfigured by regional processes of state formation, consolidation, and fragmentation.  相似文献   
68.
We examine here the discourses surrounding the lunchbox taken to school by children: aspects both of the contents and of how children consume and understand these.1 The observations presented here form part of the preliminary stages of a broader project examining ‘Men, Children and Food’. The project itself is part of a large research programme – ‘Changing Families, Changing Food’ – funded by the Leverhulme Trust (award number F/00118/AQ) from 2006 to 2008, and situated at the University of Sheffield, working in collaboration with colleagues at Royal Holloway University of London. Our aims, in ‘Men, Children and Food’, are to explore the experiences of fathers (and other male figures in the household) and of children, in relation to food practices, including ways in which the two interconnect. View all notes Examples within and beyond the UK suggest that the lunchbox is a container for various aspects of the private and public. What traces can be found inside of wider social relations, including processes of care and surveillance? We argue that the lunchbox consists of intersecting spatialities, within which children constitute a public face, and create identities, relationships and subjectivities; this perspective frames opportunities for priorities in future empirical research with children.  相似文献   
69.
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