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   260篇
  免费   15篇
  2024年   1篇
  2023年   1篇
  2021年   2篇
  2020年   4篇
  2019年   19篇
  2018年   16篇
  2017年   10篇
  2016年   13篇
  2015年   8篇
  2014年   17篇
  2013年   44篇
  2012年   12篇
  2011年   12篇
  2010年   12篇
  2009年   3篇
  2008年   4篇
  2007年   4篇
  2006年   6篇
  2005年   5篇
  2004年   9篇
  2003年   4篇
  2002年   8篇
  2001年   7篇
  2000年   3篇
  1999年   5篇
  1998年   7篇
  1997年   4篇
  1996年   3篇
  1995年   3篇
  1994年   2篇
  1993年   2篇
  1992年   2篇
  1991年   1篇
  1990年   2篇
  1989年   1篇
  1987年   1篇
  1986年   1篇
  1985年   2篇
  1984年   2篇
  1983年   1篇
  1981年   2篇
  1980年   4篇
  1979年   1篇
  1978年   2篇
  1977年   1篇
  1976年   1篇
  1973年   1篇
排序方式: 共有275条查询结果,搜索用时 218 毫秒
141.
142.
This article examines the central influence of anti‐Catholicism upon English‐Canadian nationalism in the first third of the twentieth century. Anti‐Catholicism provided an existing rhetorical and ideological tradition and framework within which public figures, intellectuals, Protestant church leaders and other Canadians communicated their diverse visions of an ideal Canada. The study of anti‐Catholicism problematises the rigid separation that many scholars have posited between a conservative ethnic nationalism and a progressive civic nationalism. Often times these very civic values were inextricable from a context of Britishness. In addition, anti‐Catholicism was not simply about theological differences between Protestants and Catholics. Instead this theological thread often intersected with the perceived socio‐political problems that Catholics and Catholicism posed. Hostility to Catholicism was not limited only to fraternal organisations such as the Orange Order; indeed the importance of anti‐Catholicism as a component of Canadian nationalism lies in its presence across the political and intellectual spectrum. Catholicism was perceived to inculcate values antithetical to British traditions of freedom and democracy.  相似文献   
143.
Agricultural journals were in wide circulation in the nineteenth century, and they were means of transmitting information about agrarian technologies and techniques to American Frontier-Phase farmers. This article explores the environmental and cultural context for the addition of a drainage feature to a nineteenth-century farmstead in Illinois (called the Bond Farm site), which preceded the site’s eventual abandonment when rainfall reached anomalously high levels. Geoarchaeological and paleoclimatologic datasets are presented as evidence of high rainfall, and the period of site settlement is constrained by both artifact and documentary sources. High maintenance costs associated with occupying the structure apparently exceeded the value of remaining, so the site was abandoned. As archaeologists grapple with how to determine causation in site occupation and abandonment, we advocate a multidisciplinary research design in historical archaeology that includes geoarchaeological analyses, which can be useful in building a microscale settlement reconstruction.  相似文献   
144.
145.
146.
147.
This paper describes the excavation, discoveries relating to the hull, machinery, and artefacts, and the history of an early steamboat wreck discovered in the Red River between Oklahoma and Texas. The wreck has been identified as the side‐wheel steamer Heroine, a vessel in service on the Mississippi, Ohio, and other western rivers of North America during the 1830s. It is the earliest example of this famous type of vessel yet studied.  相似文献   
148.
A particularly useful indicator of past vegetation are phytoliths, glassy products of plant metabolism which have distinctive size and morphology based on the plant taxa which produced them; however, their analysis is a time-consuming task. Building on investigations into mobilizing and sorting of synthetic polystyrene microspheres using a closed loop rectangular microelectromechanical systems (MEMS) electrokinetic array, we investigate these devices’ utility for sorting natural microparticles. Using phytolith samples extracted from archaeological sediment, we show that closed loop MEMS can separate the glassy bodies from both mineral contaminants and each other. Also, small differences in polarization between the phytoliths cause lateral segregation between particles of different sizes and shapes. This process facilitates manual analysis by providing a motive force to the phytoliths that translates and rotates them, showing different configurations as they are propelled by the MEMS array. The organization of the phytoliths into streams also opens the door to automated analysis using image processing. Phytolith assaying is therefore feasible using a MEMS electrokinetic ring and merits additional research to explore the potential of this innovative approach.  相似文献   
149.
150.
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