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   27篇
  免费   0篇
  2019年   1篇
  2013年   1篇
  2012年   1篇
  2010年   2篇
  2009年   1篇
  2008年   6篇
  2007年   1篇
  2005年   1篇
  2002年   2篇
  1997年   1篇
  1996年   1篇
  1995年   2篇
  1993年   1篇
  1992年   1篇
  1991年   3篇
  1988年   1篇
  1955年   1篇
排序方式: 共有27条查询结果,搜索用时 843 毫秒
1.
This paper attempts to analyse the changing residential composition of the Montreal metropolitan region over time. More specifically, it examines the principal dimensions of Montreal's residential structure in 1971 and 1981, by conducting two separate factorial analyses based on census data; this part of the study is completed by a direct analysis of change, through factor analysing indices established by combining 1971 and 1981 variables The cross-sectional comparisons underline the regularities between the two residential configurations. The analysis of relative changes uncovers the principal modifications in Montreal's residential space through the period, showing in particular that some neighbourhoods registered major shifts in the composition of their population, due to ethno-linguistic movements or to social mobility. Cet article analyse le portrait changeant dans le temps de la structure résidentielle de la région métropolitaine de Montréal. Basée sur deux analyses factorielles con-duites séparément à partir des données de recensement, la première partie s'attache à décrire les dimensions maîtresses qui structurent l'espace résidentiel de Montréal en 1971 et 7981; cette analyse est ensuite complétée par une étude plus directe du changement qui repose sur une analyse factorielle d'indicateurs établis en combinant les variables de 1971 et 1981. La compa-raison des analyses factorielles transversales souligne la régularité de la structure résidentielle de Montréal dans le tpmps, alors que l'analyse des variables de changement relatiffait ressortir les modifications majeures qui ont transformé l'espace métropolitain au cours des années soixante-dix. Elle montre, par exemple, que plu-sieurs quartiers ont enregistré des changements impor-tants dans la composition de leur population, suite à un processus de gentrification ou de mobilité ethno-Iinguistique.  相似文献   
2.
Fifty-three copper-based metal fragments, recovered from the Robitaille site in southcentral Ontario, were analysed by neutron activation to establish their chemical make-up and to sort them by their trace elemental chemistries. Three different European copper samples, one brassy copper and 48 brass samples with five different chemistries were found. As few as eight trading actions may account for all of the recovered European metal fragments.  相似文献   
3.
To help improve the well‐being of the local people, a joint Vietnamese‐UK team set out to establish a way of estimating soil and nutrient losses under different land management scenarios, using field data extrapolated through remote sensing and GIS, to obtain catchment‐wide estimates of the impact of land cover change. Immigration from remote provinces to the Dong Phu District of Binh Phuóc Province, about 120 km north of Ho Chi Minh City, has led to disruption of soil surface stability on easily eroded clayey sandstones, creating rapid nutrient depletion that affects crop yields and siltation in the channel of the Rach Rat river downstream. The poor farmers of the areas see crop yields drop dramatically after two or three years of cultivation due to the fertility decline. Soil loss varies dramatically between wet season and dry season and with ground cover. Erosion bridge measurements showed a mean loss of 85.2 t ha?1 y?1 under cassava saplings with cashew nuts, 43.3 t ha?1 y?1 on uncultivated land and 41.7 t ha?1 y?1 under mature cassava. The rates of erosion were higher than those reported in many other parts of Vietnam, reflecting the high erodibility of the friable sandy soils on the steep side‐slopes of the Rach Rat catchment. However, although the actual measurements provide better soil loss data than estimates based on the parameters of soil loss equations, a large number of measurement sites is needed to provide adequate coverage of the crop and slope combinations in this dissected terrain for good prediction using GIS and remote sensing.  相似文献   
4.
A sample of 82 anterior teeth from Krapina (Croatia) was studied using a light binocular microscope and a scanning electron microscope to document the presence of non-dietary dental scratches. The patterns of distribution, location and orientation of these marks suggest two different aetiologies: scratches on the labial-occlusal enamel border appear to be related to the action of clenching abrasive materials between teeth, while the scratches primarily in the centre of the labial face correspond to cutmarks as described by other researchers. These scratches may have been produced when flake tools involved in processing materials held between the anterior teeth came into contact with the labial enamel face. Alternatively, they may simply reflect some consistent operation which pulled hard objects across the labial surfaces of the anterior teeth. In either case, the marks on the central face of the labial surface provide evidence for manual dexterity in the Neanderthals. Of the seven Krapina individuals which show a predominant pattern, one shows a pattern of left oblique marks, while six provide evidence of right-handedness. Coupled with other Neanderthal or Upper Pleistocene individuals with these patterns, right-handedness is the dominant pattern in 90 per cent of the documented cases. One complicating factor in the analysis of these scratches in the Krapina hominids is that marks of a similar morphology are found in several anterior teeth of Ursus spelaeus from the site. While resembling the marks on the hominid incisors, the scratches on the bears lack a dominant orientation on the labial face and appear to be more variable in their widths. Despite the occurrence of some similarities in the enamel scratches between ursids and hominids at Krapina, the study of anterior dental marks provides information about manipulative activities which are unique to ancient humans. © 1997 by John Wiley & Sons, Ltd. Int. J. Osteoarchaeol., 7 : 133–149 (1997) No. of Figures: 9. No. of Tables: 5. No. of References: 34.  相似文献   
5.
The age of Neanderthal remains and associated sediments from El Sidrón cave has been obtained through different dating methods (14CAMS, U/TH, OSL, ESR and AAR) and samples (charcoal debris, bone, tooth dentine, stalagmitic flowstone, carbonate‐rich sediments, sedimentary quartz grains, tooth enamel and land snail shells). Detrital Th contamination rendered Th/U dating analyses of flowstone unreliable. Recent 14C contamination produced spurious age‐values from charcoal samples as well as from inadequately pretreated tooth samples. Most consistent 14C dates are grouped into two series: one between 35 and 40 ka and the other between 48 and 49 ka. Most ESR and AAR samples yielded concordant ages, ranging between 39 and 45 ka; OSL dating results permitted adequate bracketing of the sedimentary layer that contained the human remains. Our results emphasize the value of multi‐dating approaches for the establishment of reliable chronologies of human remains.  相似文献   
6.
This paper is based on a recent decision of the Supreme Court of Canada that will allow the Province of Quebec to restructure the system of education, from one based on religious affiliation to one based on language of instruction. The paper sets forth a number of geographic implications of such a reform, including the historic, demographic, linguistic, political, and territorial aspects of the Education Act of Quebec, known as Bill 107. While the change to linguistic-based boards is applauded, there is no clear understanding of what the new map of school board territories will look like, yet the implications of this decision are far-reaching.
Cet article est basé sur une récente décision prise par la Cour suprême du Canada qui permettra au Gouvernement du Québec de restructurer le système d'éducation, c'est-à-dire de passer d'un système fondé- sur l'appartenance religieuse à un système fondé sur la langue d'enseignement. L'article démontre quelques une des répercussions géographiques d'une telle réforme, en plus des aspects historiques, démographiques, linguistiques, politiques et territoriaux de la Loi sur l'instruction publique du Québec ou Loi 107. Même si la mise sur pied de commissions administratives à caractère linguistique est approuvée, l'élaboration de la nouvelle carte des territoires desservis par chacune des commissions scolaires demeure ambigue, mais le retentissement de cette décision est d'une portée considérable.  相似文献   
7.
8.
9.
Torres et al. (2010 ) published a series of radiocarbon, AAR, ESR and OSL dates from the site of El Sidrón, northern Spain, which is notable for the discovery of the partial remains of 12 Neanderthals. Whilst the non‐radiocarbon methods suggested an age beyond 32 600–46 300 years, direct radiocarbon dates on the human fossils were inconsistent, ranging between 10 000 and 50 000 bp . This study uses the ultrafiltration pre‐treatment protocol to obtain a date of 48 400 ± 3200 bp (OxA‐21 776) on a bone fragment and confirm the antiquity of the Neanderthal assemblage. Moreover, it demonstrates the comparability of the ultrafiltration and ninhydrin bone radiocarbon pre‐treatment protocols, and highlights the need for appropriate screening methods where valuable collections with poor biomolecular preservation are sampled for collagen extraction.  相似文献   
10.
Comment le réseau des pares urbains, ce précieux legs constitué en majeure partie entre la fin du 19e siècle et le milieu du 2CP siècle, s'est‐il forméà Montréal et Toronto? Est‐il possible de dégager un pattern d'implantation des pares et plus globalement des espaces de loisir qui nous renseignerait sur les logiques ayant présidéà leur aménagement? En reconstituant le processus de formation de tels réseaux entre 1880 et 1940, cet article met aujour certaines des caractéristiques de l'intervention des administrations montréalaise et torontoise dans le secteur des loisirs urbains et plus largement dans le développement de la ville. Autant que des espaces récréatifs, les pares peuvent être considérés comme des lieux par l'intermédiaire desquels le pouvoir municipal, en plein développement à cette époque, a cherchéà marquer le tissu urbain de sa présence, a se déployer dans l'espace. Plus qu'un travail d'aménagement physique, l'aménagement des pares représente ainsi un travail de structuration politique. Cet article presente ce double processus de structuration du territoire montréalais et torontois: d'abord sur le plan physique, en reconstituant comme les réseaux des pares se sont déployés dans l'espace urbain des deux villes; puis sur le plan politique, en examinant la manière dont les autorités locales vont considérer le problème et les modalités de leurs interventions. How was the system of urban parks, a treasured legacy of the end of the nineteenth and the first half of the twentieth centuries, formed in Montreal and Toronto? Is it possible to discern a pattern regarding the creation of parks and leisure spaces in general that would enlighten us on the principles of their management? By retracing the development of this network between 1880 and 1940, this article identifies certain traits characterizing Montreal and Toronto municipal governments with regard to their policies in the urban leisure sector, and more generally, the cities' growth. In addition to being recreational spaces, parks may also be seen as a medium through which emerging municipal powers sought to make their mark on the urban fabric, to increase their visibility in the city. Therefore, park management was more than a simple administrative question: it also served a broader goal of fashioning political structures. This article describes both facets of territorial development in Montreal and Toronto: on a geographical/material level, by retracing the process through which a network of parks was incorporated into the urban landscape of both cities; and on a political level, by examining way in which local authorities conceived of this process and planned their actions.  相似文献   
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