منابع مشابه
D-Lib Magazine
Current systems for exploring scholarly data exhibit a number of shortcomings in their ability to facilitate the identification of research trends and identify 'interesting' connections between researchers. To address these issues we have developed Rexplore, a novel system which combines statistics, human-computer interaction, and semantic technologies, to support knowledge-based exploration an...
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OpenAIRE is the European infrastructure for Open Access scholarly communication. It populates and provides access to a graph of objects relative to publications, datasets, people, organizations, projects, and funders aggregated from a variety of data sources, such as institutional repositories, data archives, journals, and CRIS systems. Thanks to infrastructure services, objects in the graph ar...
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This paper presents an expert evaluation of a collaborative annotation system named DiLAS (Digital Library Annotation Service). It can be globally accessed by individuals as well as different user communities, and knowledge is created and shared within English-speaking communities. It contains a collection of textual documents on information science and software science, and it gives access to ...
متن کاملThe broad-band X-ray spectrum of the blazar PKS B1830−211 by Chandra and INTEGRAL
In this paper we present a broad-band study of the X-ray emission of the blazar PKS 1830−211 based on Chandra and INTEGRAL observations. Notwithstanding the high redshift (z=2.507), it is a bright X-ray source (F(2-10 keV)≃ 10 erg cms), due to gravitational lensing by an intervening galaxy at z=0.89. Previous X-ray observations attribute the observed absorption at E<2 keV to the lensing galaxy....
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Spectra of the zem = 3.268 quasar PKS 2126– 158 have been obtained in the range λλ4300 − 6620 Å with a resolution R ≃ 27000 and an average signal-tonoise ratio s/n ≃ 25 per resolution element. The list of the identified absorption lines is given together with their fitted column densities and Doppler widths. The modal value of the Doppler parameter distribution for the Lyα lines is ≃ 25 km s. T...
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ژورنال
عنوان ژورنال: Nature Physical Science
سال: 1971
ISSN: 0300-8746,2058-1106
DOI: 10.1038/physci233075a0