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   9篇
  免费   0篇
  2013年   1篇
  2011年   2篇
  2008年   1篇
  2007年   1篇
  2006年   1篇
  2003年   1篇
  1997年   1篇
  1988年   1篇
排序方式: 共有9条查询结果,搜索用时 15 毫秒
1
1.
2.
3.
E pluribus unum—out of many, one—is the phrase emblazoned on the Seal of the United States, which refers to the notion that a single American voice emerges from the many diverse groups that constitute the nation. The legislative and executive branches of government often act as one voice through legislative bills and executive acts, aggregating diverse interests that reflect the national will. The notion of e pluribus unum, however, is not often applied to the judiciary, a branch of government the members of which are viewed, not as outlets for the will of the people, but as gatekeepers of the rule of law. But while the Supreme Court may not speak directly for the people, its opinions speak to the people, and the methods used by the Justices to express those opinions have revealed changes in the conception of the Court's voice throughout history.  相似文献   
4.
Census data and Trimble's erosive land use (ELU) index are used to document changes in agricultural land use and potential erosion in the Lake Simcoe—Couchiching Basin during the past two centuries. The ELU index is represented by the cover-management factor in the universal soil loss equation and takes values between 0 (no erosion) and 1.0 (accelerated erosion). Basin-wide farmland ELU scores increased prior to 1901 due to intensification of agriculture, fell between 1911 and 1961 as yields and areas under grass increased, and then increased again from 1961 onward due to expansion in corn hectarage. The 0.152 index computed in 1981 is almost as large as the largest index (0.154)computed in 1891 and illustrates the huge environmental changes in the basin since early settlement without the beginnings of a permanent and more viable system of land use. Les changements d'utilisation des sols survenus au cours des deux derniers siècles dans le bassin du Lac Simco-Couchiching de même que I'érodibilité de ces sols, font I'objet d'une évaluation à I'aide des données de re-censements et de I'indice d'érosion particulier aux dif-férentes utilisation du sol (indice de Trimble). Le facteur de gestion de la couverture dans l'équation universelle de la partie de sol figure dans cet indice dont la valeur se range entre 0 (absence d'érosion) et 1.0 (érosion en accélération). Les scores pour les terres agricoles à I'éhelle du bassin ont augmenté avant 1901 quand l'agriculture s'est intensifiée, puis ont chuté entre 1911 et 1961 à mesure que les rendements et les superficies herbacées augmentaient, et enfin ont de nouveau re-monté depuis 1961 à la suite de l'expansion des superficies plantées en maïs. L'indice obtenu pour 1981 (0.1521 est presque aussi élevé que I'indice le plus fort atteinten 1891 (0.154). ll démontre les changements considérables survenus dans I'environnement du bassin depuis le tout début de son peuplement, alors qu'aucun système d'utilisation des sols permanent et plus viable n'a encore pu èmerger.  相似文献   
5.
Lake Nuga Nuga is a levee‐dammed lake in the dry sub‐humid tropics of the Fitzroy Basin in Central Queensland, Australia, that has expanded significantly since it was first mapped in 1866. 210Pb dating of a sediment core from the lake indicates that the rate of sedimentation has been constant for the past 67 years at 3 mm yr?1 despite widespread clearing and land use intensification in the catchment during that time. Pollen analysis confirms this and shows that there was little change in vegetation during the early settlement period (1863–1962), but the intensification of land use that started in the early 1960s brought about a dramatic change in the vegetation communities. This study demonstrates that while sediment production may be significantly impacted by land‐use activities, sediment delivery is primarily controlled by topography.  相似文献   
6.
The paucity of convincing evidence for congenital bone lesions of syphilis in the archaeological record led to study of the human remains from the Buffalo site in West Virginia, dated at 550—650 years BP. The diagnosis of syphilis (venereal) in adults was based on previously validated population criteria for the recognition of syphilis and its distinction from among the other treponemal diseases. Among the 151 juveniles (23.3 per cent of the total series), only one had macroscopic evidence of periosteal disease. The low frequency of recognizable osseous stigmata characteristic of congenital syphilis, combined with the conspicuous absence of pathognomonic dental lesions, make such periosteal lesions insufficiently sensitive criteria for the identification of syphilis in the archaeological record. © 1997 by John Wiley & Sons, Ltd.  相似文献   
7.
8.
This article explores the prospects for civilian governance over Pakistan's military in the policy‐relevant future. After reviewing the Pakistan army's past interference in the country's judicial and political affairs, it turns to the ongoing political maneuvering of the current Chief of Army Staff, General Ashfaq Parvez Kayani, despite Pakistan's ostensible democratic dispensation. The article dilates on the impact of US engagement on the robustness of the Pakistan army's dominance and questions the newfound US commitment to promoting democratization and civilian control. The article argues that while conventional wisdom places the onus disproportionately upon the military's penchant for interventionism, the army has intervened only with the active assistance of civilian institutions, which are subsequently further eroded with every military takeover. It concludes with a consideration of whether or not genuine civilian control would result in a significant change in Pakistan's foreign and domestic policies, particularly Pakistan's well‐known utilization of Islamist militants in India and Afghanistan.  相似文献   
9.
Summary. Recent finds of hoarded silver in Cisjordan present new material for the consideration of the conceptual history of coined metals. When the fundamental concepts associated with coinage are abstracted from the various objects that express them, it is possible to see that a kind of coined metal existed in Cisjordan and other parts of the Near East prior to the traditional 'invention' of coinage by the Lydians and Greeks c. 600 BC. 1 Both hoards and written sources indicate that seals affixed to precious metals at times qualified them in a numismatic sense by guaranteeing weights set to standards as well as controlled composition. What has been characterized as the 'invention' of coinage was rather an adaptation of these same principal concepts. The frequency and size of silver hoards from Cisjordan point to a proliferation in the 'monetary' use of silver in that region during the Iron Age and suggest a relationship to the overwhelming preference for silver coinages among the Greeks.  相似文献   
1
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