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   164篇
  免费   4篇
  168篇
  2023年   2篇
  2020年   1篇
  2019年   10篇
  2018年   8篇
  2017年   3篇
  2016年   3篇
  2015年   8篇
  2014年   2篇
  2013年   44篇
  2012年   4篇
  2011年   10篇
  2010年   10篇
  2009年   5篇
  2008年   4篇
  2007年   9篇
  2006年   5篇
  2005年   3篇
  2004年   5篇
  2003年   3篇
  2002年   1篇
  2001年   6篇
  2000年   6篇
  1999年   1篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1995年   4篇
  1990年   1篇
  1986年   1篇
  1980年   1篇
  1976年   1篇
  1975年   1篇
  1974年   1篇
排序方式: 共有168条查询结果,搜索用时 0 毫秒
21.
22.
23.
As is still the case in many parts of Iran, the distribution of languages and dialects in Ilam Province, western Iran, is unevenly documented. There have been several studies on specific language varieties spoken throughout the province but, in large part because of conflicting perspectives on the relationship between language and ethnicity, the situation for the region as a whole has until now remained unclear. The present study first of all brings together existing sociolinguistic and demographic data on language distribution and highlight areas of uncertainty. The main part of the study provides an overview of local perceptions of language distribution and language use based on field research and interviews conducted in each of the province's ten regions (shahrestān) and their twenty-five districts (bakhsh). Here, respondents' assessments of the geographic extent of the province's four main languages—Kurdish, Luri, Laki and Arabic—as well as more minor languages spoken by immigrants from elsewhere in Iran are summarized. For Kurdish in particular, which is the major of the four languages, the article shows the perceived geographic distribution of each major dialect and its affiliation within one of two major Kurdish dialect groups: Ilāmi (or “Feyli”) and Kalhōri. This analysis is followed by a brief discussion of multilingualism. The results of the study are brought together in a map of the province's languages.  相似文献   
24.
25.
26.
27.
Thomson  Erik 《French history》2007,21(4):377-394
Cardinal Richelieu's commercial projects have long been seenas a part of his early efforts to reform the French state. Thispaper argues that Richelieu's commercial activity can more profitablybe viewed in the context of his thinking about relations betweenFrance and its neighbours and of a pan-European movement toreconsider the connections among commerce, governance and sovereigntyspawned by the Dutch war with Spain. Specifically, it examinesRichelieu's relations with the Dutch jurist Hugo Grotius. In1626 the cardinal attempted to hire Grotius as a commercialexpert, consulting with him on several occasions. Although Grotiusdeclined, the cardinal was deeply influenced by Grotius’arguments about the freedom of commerce and trade. Richelieuadapted these arguments to suit French needs and his own Catholicvision of the state.  相似文献   
28.
Pricing, Capacity Choice, and Financing in Transportation Networks   总被引:5,自引:0,他引:5  
Abstract.  This paper explores interrelations between pricing, capacity choice, and financing in transportation networks. We build on the Mohring‐Harwitz result on self‐financing of optimally designed and priced roads and investigate it in a network environment under various types of second‐best regulation. A small network model with endogenous car ownership demonstrates that optimal congestion pricing and capacity choice over an entire network may cause user prices to increase more in initially mildly congested areas compared to heavily congested areas. Furthermore, a flat kilometer charge under optimal capacity choice may result in first‐best efficiency gains.  相似文献   
29.
The chronology of prehistoric Sami settlement sites has previously been established by conventional radiocarbon dating of bulk charcoal samples associated with hearths from sunken hut floors (stállo-foundations). Here we present results of a comprehensive dating exercise of stállo-foundations in the alpine area of northern Scandinavia using Accelerator Mass Spectrometry (AMS) radiocarbon dating of charcoal. Over a 3 km2 study area, AMS calibrated ages of hearth charcoal from 22 stállo-foundations across 12 sites securely date these features to between cal. AD 640 and AD 1180. Only small variations in age were found between charcoal samples from different areas of a given hearth. Statistical analysis of all the charcoal AMS radiocarbon dates obtained reveals that 12 stállo-foundations across nine sites are contemporaneous and date to the Viking Period (AD 800–AD 1050). The tightly constrained AMS-based chronology of stállo-foundations contrasts with the existing chronology based on conventional radiocarbon analysis, which places these features within a significantly greater time-frame of between AD 600 and AD 1900, with most dates ranging between AD 800 and AD 1350.This discrepancy is likely to result from the necessity of collecting composite hearth charcoal particles, which may originate from different phases of occupation, in order to achieve the required final carbon content for conventional radiocarbon analysis. We argue that the new AMS-based radiocarbon chronology of stállo-foundations presented here supersedes the existing chronology based on conventional (Gas Proportional counting) radiocarbon analysis and we advocate the use of AMS radiocarbon dating in future hearth investigations.  相似文献   
30.
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