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   265篇
  免费   4篇
  269篇
  2023年   6篇
  2022年   1篇
  2021年   1篇
  2020年   5篇
  2019年   8篇
  2018年   18篇
  2017年   20篇
  2016年   14篇
  2015年   11篇
  2014年   10篇
  2013年   44篇
  2012年   9篇
  2011年   9篇
  2010年   8篇
  2009年   10篇
  2008年   4篇
  2007年   3篇
  2006年   3篇
  2005年   3篇
  2004年   1篇
  2002年   1篇
  2001年   2篇
  2000年   4篇
  1999年   1篇
  1998年   4篇
  1997年   5篇
  1996年   5篇
  1995年   5篇
  1994年   5篇
  1993年   4篇
  1992年   4篇
  1991年   4篇
  1990年   6篇
  1989年   5篇
  1988年   4篇
  1987年   5篇
  1986年   9篇
  1985年   1篇
  1982年   2篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
  1975年   1篇
  1974年   1篇
排序方式: 共有269条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
In this paper, the infrared stimulated luminescence (IRSL) property of naturally corroded aluminum and its possible applications in retrospective dosimetry have been briefly studied. Results are interesting, in particular with regard to the efforts of finding new and widely available materials for accident dosimetry. For aluminum corrosion, the dose response was found to be approximately linear between 2–80 Gy and to reach saturation before 300 Gy. The signal also showed good repro-ducibility without significant fading over storage durations of up to four mounts at room temperature. In addition to the luminescence, the corrosion samples were also analysed by X-ray Fluorescence (XRF) and X-ray Diffraction (XRD), but conclusive identification of the luminescent phase could not be made. It is concluded that the IRSL signals of this material can be favourable for dosimetry research.  相似文献   
95.
Since Turkey's application for membership of the European Union (EU) in 1987, the EU has itself been a structural component of Turkey's political transformation. The European impact intensified after Turkey was granted the status of an official candidate at the EU's Helsinki Summit in 1999. Since then, Turkey has issued a series of reform packages with the aim of starting accession negotiations, which began in October 2005. These reforms have initiated a democratic regime that is structurally different from its predecessors in terms of its definition of political community, national identity and the territorial structure of the state. Among many other aspects of the current political transformation such as the resolution of the Kurdish problem and administrative reform, this article concentrates on how the European impact, which I label Europeanisation, has influenced state–religion relations in Turkey. Europeanisation has three major mechanisms that influence actors, institutions, ideas and interests in varying ways: institutional compliance, changing opportunity structures, and the framing of domestic beliefs and expectations. The article concentrates on how these mechanisms operate in the creation of a new regulatory framework of religion in Turkey.  相似文献   
96.
Under the auspices of the Portuguese colonial government, Lereno Barradas and Santos Júnior (coordinator of the Anthropological Mission of Mozambique) carried out several archaeological field surveys from 1936 to 1956 that resulted in a data set that includes a total of close to 90 sites, mostly attributed to the Stone Age. This early research added to the previous work of Van Riet Lowe in the Limpopo Valley of southern Mozambique. With the new millennium, Mozambique has emerged as a crucial geographic area in which to understand the various hypotheses about recent human evolution. Specifically, its coastal location between southern and eastern Africa is ideal for testing ideas about the link between early coastal adaptations and the appearance of anatomically modern humans (AMH). Except for the recent work by Mercader’s team in northern Mozambique, the number of researchers and projects on this topic in Mozambique is still limited because of the general predominance of interest in later periods among archaeologists working in the country, mainly due to their focus on issues related to precolonial heritage and national identity. Based on the early maps from Santos Júnior and more recent data acquired through various projects, we present a series of maps for the Stone Age prehistory of Mozambique. The maps are also based on a critical evaluation of the sites and a review of some of the materials that are presently curated at the Instituto de Investigação Científica e Tropical (IICT) in Lisbon, Portugal, as well as the materials stored at the Department of Archaeology of Universidade Eduardo Mondlane, Maputo. The sites are also presented in an online database with the information on all sites used in this study. This database is open to all and will be updated continuously. A preliminary interpretation of the regional distribution of the sites is also attempted, linking aspects that include region, topography and altitude, geomorphology, and cultural phase. These results will be the first step for research and knowledge in Mozambique on Stone Age prehistory and the emergence and settlement pattern of AMH.  相似文献   
97.
As the largest part of military usage of the territory depends on a thorough analysis of its morphology, spatial analysis with Geographic Information Systems (GIS) software reveals a great potential as a way for studying battlefields and/or other military buildings and scenarios from the past, while supporting interpretations of territorial occupation and related organization of military forces through event simulation. This paper presents a GIS-based method to model and assess the permeability of historical defensive systems from the period that preceded the mechanization of warfare of the late nineteenth century, i.e., based on artillery installed in fortifications. The method was applied to analyze the permeability of the Lines of Torres Vedras (LTV) defensive system, a multi-line fortification complex which was operational during the Peninsular War in the beginning of the nineteenth century and located north of Lisbon, Portugal. The structures of the LTV and local terrain were modelled in GIS using a set of proposed parameters that support territorial analysis, combined with the capability of contemporary weaponry. A methodical quantification and combination of these parameters enabled a better understanding of the systemic design of the defensive lines in terms of its permeability, contributing to a discussion of the LTV particular military setting based on the interpretation of these indicators. Global and sectorial analyses of the permeability of the LTV defensive system were conducted.  相似文献   
98.
99.
100.
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