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   137篇
  免费   2篇
  2021年   2篇
  2020年   2篇
  2019年   5篇
  2018年   3篇
  2017年   8篇
  2016年   5篇
  2015年   1篇
  2014年   2篇
  2013年   44篇
  2012年   3篇
  2011年   5篇
  2010年   2篇
  2009年   1篇
  2008年   2篇
  2007年   3篇
  2006年   2篇
  2005年   2篇
  2004年   2篇
  2003年   1篇
  2002年   3篇
  2001年   2篇
  2000年   1篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1994年   2篇
  1993年   1篇
  1991年   1篇
  1990年   1篇
  1989年   2篇
  1988年   1篇
  1987年   1篇
  1986年   1篇
  1984年   3篇
  1983年   1篇
  1982年   1篇
  1981年   3篇
  1980年   2篇
  1979年   1篇
  1978年   2篇
  1977年   1篇
  1976年   3篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1970年   1篇
  1969年   1篇
  1965年   1篇
排序方式: 共有139条查询结果,搜索用时 15 毫秒
11.
During South Africa’s transition from apartheid to democracy the most virulent opposition to change came from Zulu nationalism. Post‐apartheid, however, Zulu nationalism has largely waned. This is because Zulu nationalism was instrumentally invoked and jettisoned by the Inkatha Freedom Party. Beginning in 1975, Inkatha embraced a ‘third way’ resistance politics between ‘acquiescence’ in apartheid and ‘impossible’ militant resistance. It was only later that Inkatha turned to Zuluness when it was out‐competed by the ANC and allies, first over the leadership of resistance politics and secondly during the transition. After 1994 the inclusion of the IFP in democratic government made old strategies redundant and thus it abandoned Zulu nationalism. Moreover, while a widespread sense of Zuluness exists, the meanings attached to it vary to the extent that the Zulu nation cannot exist. Thus the Zulu nationalism of the transition was an elite‐driven political nationalism prosecuted without a popularly imagined Zulu nation.  相似文献   
12.
13.
The early Epipalaeolithic site of Ohalo II offers evidence that, some 19 400 years BP, prehistoric people on the shore of the Sea of Galilee exploited birds in large numbers as a food source and for the decorative value of their feathers and claws. The superb preservation of even the most delicate fauna at this site enabled an extensive analysis of a type rarely possible with avian remains of this antiquity. Certain types of birds were obtained preferentially, although a broad variety of avifauna was taken; preliminary analysis of some 488 identifiable bone fragments indicates that 16 families, 40 genera, and 68 different species are represented in the archaeological assemblage. As might be expected from a lakeshore site, the remains of waterfowl abound. The most diversity within a family occurs among the Anatidae, with ten genera and 22 species; however, the most frequently occurring birds are those of the family Podicipidae, or grebes, which account for approximately one-third of the assemblage. Species common to a variety of other environments are found in significant numbers as well (namely the Accipitridae). Large birds dominate the assemblage and the number of species represented by each family is disproportionate to the numerical frequency of those species at present, with passeriformes relatively poorly represented. The regular migration pattern of birds today broadly indicates that the site was occupied during the months of September–November and February–April. There are, however, a number of species that appear in this region today only from December through to March, which might indicate a longer, semi-permanent encampment. A biseasonal, or perhaps extended winter occupation pattern at Ohalo II seems to support a shift away from the generalized foraging economy of hunter–gatherers and to indicate the onset of planned intensive collecting, thus foreshadowing the initial steps toward sedentism. © 1998 John Wiley & Sons, Ltd.  相似文献   
14.
15.
The objective of this paper is to compare fractal‐based parameters calculated by different fractal methods for urban built‐up areas and to link the observed spatial variations to variables commonly used in urban geography, urban economics, or land‐use planning. Computations are performed on Brussels, Belgium. Two fractal methods (correlation and dilation) are systematically applied for evaluating the fractal dimension of built‐up surfaces; correlation is used to evaluate the fractal dimension of the borders (lines). Analyses show that while fractal dimension is ideal for distinguishing the morphology of Brussels, each estimation technique leads to slightly different results. Interesting associations are to be found between the fractal dimensions and rent, distance, income, and planning rules. Despite its limitations, fractal analysis seems to be a promising tool for describing the morphology of the city and for simulating its genesis and planning. The model is robust: it replicates the urban spatial regularities and patterns, and could hence fruitfully be integrated into intra‐urban simulation processes.  相似文献   
16.
17.
18.
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