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   82篇
  免费   9篇
  2022年   1篇
  2021年   1篇
  2020年   2篇
  2019年   7篇
  2018年   6篇
  2017年   7篇
  2016年   8篇
  2015年   12篇
  2014年   1篇
  2013年   19篇
  2012年   3篇
  2011年   3篇
  2010年   5篇
  2009年   6篇
  2008年   3篇
  2007年   3篇
  2006年   4篇
排序方式: 共有91条查询结果,搜索用时 15 毫秒
51.
Despite that the Badakhshan Province (Afghanistan) remains the most plausible hypothesis for the lapis lazuli used in antiquity, alternatives proposed in literature are worth to study to confirm or disprove their historical reliability. In this work, a protocol for determining the provenance of lapis lazuli rocks used for carved artefacts is described. Markers for the univocal attribution of the raw material to a source were identified analysing 45 rocks of known provenance (among which 15 georeferenced) from 4 quarry districts. To the best of our knowledge, this reference database is the widest in provenance studies on lapis lazuli. All the markers are recognisable by means of Ion Beam Analysis (IBA) techniques, in particular micro-proton-induced x-ray emission (PIXE) and micro-ionoluminescence (IL). These techniques are non-invasive and applicable in air, allowing to analyse artworks and rocks of practically any shape and dimension without sample preparation.The protocol was applied to determine the provenance of raw material used for carved lapis lazuli artefacts kept at the Egyptian Museum of Florence, the second most important Egyptian museum in Italy, second only to the museum of Turin. The collection in Florence has a great historical value and includes several lapis lazuli pendants, scarabs, small statuettes and amulets ascribable mainly to the first millennium BC. Following the protocol, 11 of these artefacts were analysed by means of IBA techniques. Results ascribe the raw material to the Afghan quarry district.  相似文献   
52.
This paper aims to study notable examples of transatlantic transmissions of norms, beliefs and values that have revised the sense of a Luso-Brazilian community in a global world. The so-called Atlantic Civilization understood before as essentially Anglo-Saxon, takes a new shape when seen by the South Atlantic. If the historical relationship between Portugal and Brazil was one of colonial containment, since the nineteenth century those bilateral relations have passed through a process of reconciliation and networking – first through a mutual acceptance, then through the establishment of common international goals. On the one hand, this networking between Portugal and Brazil has occurred through public symbolic demonstration and the commemoration of a common culture; on the other hand, this networking has evolved through cultural connections – music, literature, and cinema, – all of which serve to validate a postcolonial review. Cultural connections that have survived the proverbial test of time have proven to be valuable in assessing the evolving relationship between Portugal and Brazil. Therefore, the Brazilian conscientiousness of its importance in the regional and world sphere involved the preparation of a Brazilian cultural diplomacy that recognized the political desire of diplomacy between Portugal and Brazil – a diplomacy that is largely demonstrative of the importance of soft power in a world of global networks.  相似文献   
53.
54.
55.
Abstract

Observation of cause–effect patterns of change in coastal environments provides insights into vulnerable areas and supports prediction and adaptation to flooding and erosion. Historic and periodic (6–8 year intervals) imagery from the Landsat archive is used to investigate transformations in the Atlantic coast of two Scottish islands over the period 1989–2011. Supervised classification of spectrally normalized images followed by change detection and spatial analysis reveals the patterns of change and the location of the most dynamic coastal areas. Quantitative measures of recent shifts and movement rates of relevant coastal lines, such as the lower limit of land-based vegetation, are assessed with the Digital Shoreline Analysis System. While very low rates are indicated for horizontal changes in the position of the lower limit of land-based vegetation (0.3?m?y?1), specific areas have been subjected to high rates of coastal progradation as well as erosion (e.g. 2.5?m?y?1 at Stilligarry). Information derived from satellite data supports the characterization of geomorphologically dynamic coasts at regional scales. With a rich and open access archive of imagery, a commitment to continuity, and compatibility with the Earth observation missions of other space programs, the Landsat mission offers useful and otherwise unavailable data for monitoring of coastal areas.  相似文献   
56.
Archaeological works at Entre Águas 5 (Portugal) uncovered a seasonal LBA settlement with significant metallurgical remains (crucibles, moulds, prills and a tuyere) related to bronze production. Radiocarbon dating ascribes an occupation period (10th–9th century BC) previous to Phoenician establishment in Southwestern Iberia. In spite of the proliferation of metal artefacts during LBA, the production of bronze alloys is still poorly understood. An integrated analytical approach (EDXRF, optical microscopy, SEM–EDS, micro-EDXRF and Vickers microhardness) was used to characterise this metallurgy. Crucibles show immature slags with copious copper nodules, displaying variable tin content (c. 0–26 wt.%), low iron amount (<0.05 wt.%) and different cooling rates. Certain evidences point to direct reduction of oxide copper ores with cassiterite. Scorched moulds with residues of copper and tin indicate local casting of artefacts. Finished artefacts also recovered at the site have an analogous composition (bronze with ∼10 wt.% Sn and low amounts of Pb, As and Fe) typical of coeval metallurgy in SW Iberia. Some artefacts reveal a relationship between typology and composition or manufacture: a higher tin content for a golden coloured ring or absence of the final hammering for a bracelet. An uncommon gilded nail (gold foil c. 140 μm thick; 11.6 wt.% Ag; ∼1 wt.% Cu) attests the existence of evolved prestige typologies. This LBA settlement discloses a domestic metallurgy whose main features are typical in Iberian Peninsula. Finally, it should be emphasized that a collection as comprehensive and representative of a single workshop has rarely been studied, enabling a deeper understanding of the various operations involving the bronze production and manufacture of artefacts.  相似文献   
57.
An integration of geophysical surveys, ground hyperspectral data, aerial photographs and high resolution satellite imagery for supporting archaeological investigations at the multi-component Vészt?-Mágor Tell, located in the southeastern Great Hungarian Plain, is presented in this study. This is one of the first times that all these techniques have been combined and evaluated for retrieving archaeological information. Geophysical explorations, specifically magnetic gradiometry and ground penetrating radar methods, have revealed shallow linear anomalies and curvilinear rings at the Tell. The use of remote sensing images has confirmed the diverse anomalies with respect to geophysics through photointerpretation, radiometric and spatial enhancements. Moreover, several indices from ground hyperspectral data also have revealed stress vegetation anomalies. These integrated results were used to map the main areas of archaeological interest at the Vészt?-Mágor Tell and plan future excavations. It was found that these multiscalar data can be used efficiently for detecting buried archaeological features.  相似文献   
58.
In this article I discuss the history of Italian Jews from the Emancipation to the racial laws of 1938 and their present-day attitudes to Judaism and the State of Israel. My aim is to suggest how the policy of social integration enabled Italian Jews to construct a new identity without losing their ancestral heritage. The example of Italian Jewry is relevant to understanding the growing need in today‘s European Union—now comprising 27 countries with different languages, cultures, and values—of revising the concept of national identity and of exploring ways of constructing a new European identity.  相似文献   
59.
60.
In addition to being the object of policy and legal initiatives, families of migrant origin have become a focus of debate concerning differences and its limits. Migrants themselves, however, are also reflecting on how to manage family relationships in a changing world in which migration is mostly transnational. This article aims to discuss the influence of religious participation on the reconfiguration of processes of family dynamics promoted by three groups of migrant women who, while settled in Lisbon, maintain transnational ties with their countries of origin and with various diasporic spaces. Guiding research questions are: to what extent does religious participation provide migrant women with connections, networks and other intangible resources? How are these resources mobilised as ‘bonding' and ‘bridging' social capitals? Can such capitals become a conduit for the redefinition of family relations and female self-narratives? Comparative analysis confirms that the three groups discussed not only mobilise religious belonging and ties to generate resources, but also convert these connections into social (and other forms of) capital, thus triggering desired changes that affect the lives of their children and families in both the short and long term. While migration does not alter long-standing patterns provided by their own respective sociocultural frames of belonging, our findings reveal that the three groups of interlocutors use religious participation to explore tactics, social capitals and mobility spaces and, further, to negotiate, without subverting, specific family inequality dynamics.  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