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   166篇
  免费   13篇
  2023年   4篇
  2022年   1篇
  2021年   1篇
  2020年   10篇
  2019年   6篇
  2018年   20篇
  2017年   14篇
  2016年   12篇
  2015年   10篇
  2014年   8篇
  2013年   37篇
  2012年   9篇
  2011年   12篇
  2010年   11篇
  2009年   4篇
  2008年   1篇
  2007年   1篇
  2006年   1篇
  2005年   2篇
  2004年   2篇
  2003年   1篇
  2002年   1篇
  2001年   2篇
  1999年   1篇
  1997年   2篇
  1996年   1篇
  1995年   3篇
  1993年   1篇
  1992年   1篇
排序方式: 共有179条查询结果,搜索用时 15 毫秒
111.
In this study we present evidence supporting the view that people's perceived risk of hurricane‐related hazards can be reduced to a single seriousness score that spans different hurricane‐induced risk types and that compliant behavior with official advisories is strongly dependent on whether one perceives a high risk with respect to any type of hurricane‐related hazards. Our analysis suggests that people are less sensitive to risk type than they are to the general seriousness of the risks. Using this single seriousness score, representing a composite risk measure, emergency managers can be informed about the severity of the public's risk perceptions to impending hurricane hazards and might better craft their public directives in ways that minimize disruptive evacuations and achieve greater compliance with government directives.  相似文献   
112.
In this article, we present the results of the 2011 field season at the Iron Age burial site of Nandá, on the Island of Corisco, located between Equatorial Guinea and Gabon. The excavations followed a survey conducted in 2009, which evinced the extraordinary interest of the site and suggested its funerary nature. The excavations documented three levels of occupation belonging to two different phases, which are known in the region as Oveng (ad 1–600) and Group II (ad 600–1100). The first phase was characterized by secondary burials with rich metallic offerings, which were sealed by a settlement at the end of the period; the second phase witnessed the establishment of a large burial site with primary interments. Similar burials are known from Cameroon and Gabon, but the number of features identified at Nandá and the funerary sequence are quite unique in the region. Here, the evidence will be interpreted in light of Jan Vansina’s theories, where he postulates a common political tradition in Equatorial Africa from which later developments stem.  相似文献   
113.
114.
115.
In this report we present and discuss an unpublished letter written by Santiago Ramón y Cajal in October 1904 in relation to his possible nomination for the Nobel Prize for Physiology and Medicine. This letter shows that Cajal was aware of his previous nominations for the Prize. He was convinced that these nominations had not been successful because neither anatomy nor histology were among the sciences included in the Nobel Statutes' definition of Physiology or Medicine. He gives a list of the merits he thought might be used for a new nomination, which included only works concluded during the previous five years.  相似文献   
116.
This contribution draws an historical and conceptual analysis of the concept of i?lā?, which is traditionally understood as “reform” in general terms, and tries to stress the origins and the main conceptual paradigms of the two main ideological and political lines in which this concept has been developed and is still used in the Arab Maghreb by main political actors and thinkers.  相似文献   
117.
Since 2005 we have been utilizing accelerator mass spectrometry (AMS) 14C dating in research on calcium oxalate crusts associated with open air rock art of the Iberian Peninsula. In this paper we present two dates linked with three eye-idol pictographs at Abrigo de los Oculados (Henarejos, Cuenca, Spain). Radiocarbon ages for these motifs agree with the expected iconography-based archaeological chronology. Such oxalate dates could provide an independent basis for evaluating chronological theories for post-Palaeolithic sites, designated in the UNESCO World Heritage List as Rock Art of the Mediterranean Basin on the Iberian Peninsula.  相似文献   
118.
Cruise Passengers in a Homeport: A Market Analysis   总被引:1,自引:0,他引:1  
Abstract

The aim of this study is to examine cruise passengers' characteristics, preferences and their overall experience in a port of call. Based on 1,361 survey data collected from passengers in the port of call of Cartagena, during the third quarter of 2009, a three-step multivariate market segment analysis is employed. First, a correspondence analysis is run to reveal the underlying factors in the data; second, based on the correspondence analysis, a hierarchical cluster investigation is performed to segment the sample into homogeneous groups; third, a decision tree is computed to characterise each group. The cluster analysis identifies six distinct market segments differentiated by nationality, satisfaction, safety perception and expenditure. The findings imply several policy directions. In particular, institutions should enhance the perception of safety in Cartagena to guarantee repeated visits, an ad hoc marketing policy may encourage revisit by young South Americans, and managers should extend the inland visiting time that is likely to produce local multiplier effects.  相似文献   
119.
The change in cattle size during the late Iron Age and the Early Roman period is a widely known phenomenon. However, hardly any information is available about this change and its causes in the north-east of the Iberian Peninsula. In order to shed more light on this issue, variations of cattle size and shape through the analysis of Bos taurus remains from ten archaeological sites located in the north-east Iberia and occupied from the middle fifth century bc to the third century ad are examined in this paper. Osteometric postcranial and teeth analyses show a clear change in cattle size and shape during the Romanization period at newly founded sites. This change is documented at all the sites from the Early Roman period. Genetically, authenticated results from a short fragment of the mitochondrial d-loop were obtained from 6 cattle metacarpals out of 33 tested. They affiliate to the main European taurine haplogroup T/T3. The integration of the available data including the archaeological background suggests that the presence of these morphologically different cattle, introduced during the Romanization period, was more pronounced at sites interpreted as villas and trading posts, rather than at cities during the Early Roman period.  相似文献   
120.
Although there are many archaeological and ethnographic evidences for the use of slate and similar rocks for flaking purpose, they raised little interest among specialists, leading to a general ignorance of specific problems associated with these raw materials. Starting from the study of several Neolithic and Chalcolithic slate collections of the Western Iberia, the mechanical properties of slate and its impact on knapping process has been defined; subsequently, manufacturing and use of slate and phyllite projectiles have been undertaken. The results show that the ease with which these materials break into sheets of uniform thickness and morphology would provide an ideal basis for a fast and easy manufacture of arrowheads. In addition, these projectiles have shown a penetration capability and resistance statistically equivalent to those made on more standard materials (i.e. chalcedony or rock crystal). Therefore, slate and other rocks with a high degree of fissility would have been very attractive to prehistoric knappers endeavouring to make arrowheads.  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