1,720,992 research outputs found
Cell-ID location technique, limits and benefits: an experimental study.
No full textThe mobile phone market lacks a satisfactory location technique that is accurate, but also economical and easy to deploy. Current technology provides high accuracy, but requires substantial technological and financial investment. In this paper we present the results of experiments intended to asses the accuracy of inexpensive Cell-ID location technique and its suitability for the provisioning of location based services. We first evaluate the accuracy of Cell-ID in urban, suburban and highway scenarios (both in U.S. and Italy), we then introduce the concepts of discovery-accuracy and discovery-noise to estimate the impact of Positioning accuracy on the quality of resource discovery services. Experiments show that the accuracy of Cell-ID is not satisfactory as a general solution. In contrast we show how Cell-ID can be effectively exploited to implement more effective and efficient voice location-based services
Relationships between the Pesciara di Bolca and the Monte Postale Fossil-Lagerstätten (Lessini Mts., northern Italy)
No full textVery close (about 300 m) to the world-famous Pesciara di Bolca Fossil-Lagerstätte, the Monte Postale is the only locality where it is possible to follow a more or less complete sedimentary succession. Despite their closeness, the geological and stratigraphical relationships between the Pesciara and the Monte Postale are still poorly known. This is mainly due to the widespread volcanic and volcanoclastic deposits that, together with tectonic movements of different ages, extensively dismembered and displaced the sedimentary rocks. Therefore, there is no continuity between the limestone of the Pesciara succession and the similar rocks of the Monte Postale, on the opposite side of the valley.At present, the stratigraphy of the Monte Postale succession is still founded on the sketch and description of Fabiani (1914). More recently, Massari & Sorbini (1975) described only a part, about 30 m thick, of the Monte Postale succession.We recently re-examined the whole succession, measuring a composite stratigraphic section made up by two sections (lower and upper) separated by a fault (the Monte Postale fault). The preliminary results of the study of the samples collected revealed that the upper section, bearing quite rich Alveolina assemblages could be dated to the SBZ 11 biozone, i.e. Middle Cuisian (Ypresian). The upper section contains laminated micritic limestone with fish and plants, which are therefore contemporary to the similar limestone of the Pesciara section.The characters of the Monte Postale laminated limestone (MPLL) are in some way different from that of the Pesciara (PLL), because the MPLL bear often bad-preserved fishes (Massimo Cerato, pers. comm.) as compared with the ones coming from the PLL. Moreover, the Monte Postale succession includes a significant thickness of “normal” limestone, very rich in benthonic fossils (especially Alveolina), witnessing the prolonged conditions of normally oxygenated sea bottom, with some intervals of oxygen depletion marked by the MPLL.In the Pesciara section, all the larger foraminifers and other benthic fossils were transported and redeposited in an anoxic environment with terrigenous inputs mainly due to aeolian transport (Schwark et al., 2009).According to these data, we can provisionally conclude that the Monte Postale succession represents a palaeoenvironment more open to marine circulation and consequently better oxygenated than the Pesciara “basin”. More detailed analyses are required to better precise the palaeoenvironmental evolution in the Monte Postale succession.ReferencesFabiani, R. 1914: La serie stratigrafica del Monte Bolca e dei suoi dintorni. Memorie dell’Istituto di Geologia della Regia Università di Padova 2 [1913], 223-235.Massari, F. & Sorbini, L. 1975: Aspects sédimentologiques des couches à poissons de l’Éocène de Bolca (Vérone – Nord Italie). IX Congres International de Sedimentologie, Nice, 55-61.Schwark, L., Ferretti, A., Papazzoni, C.A. & Trevisani, E. 2009: Organic geochemistry and paleoenvironment of the Early Eocene “Pesciara di Bolca” Konservat-Lagerstätte, Italy. Palaeogeography, Palaeoclimatology, Palaeoecology 273 (3-4), 272-285
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Tectonostratigraphic evolution of the Jurassic extensional basins of the eastern southern Alps and Adriatic foreland based on an integrated study of surface and subsurface data
No full textSuccessions that characterize the eastern southern Alps have
been compared with coeval units drilled in the Alpine foreland
(Po and Veneto plains, northernAdriatic Sea). The eastern
southern Alps are composed of a carbonate platform-plateau,
drowned in the Early Jurassic (Trento platform and plateau);
a basin formed in the Early Jurassic (Belluno Basin) and a carbonate
platform that lasted from the Jurassic to the Cretaceous
(Friuli platform). Integration of stratigraphic and geophysical
data illustrates the extensional architecture of the Alpine foreland
subsurface. At the beginning of the Jurassic, peritidal successions
were widespread everywhere except for the Belluno
Basin. A reorganization of the Early Jurassic paleogeography affected
the southern Alps around the Sinemurian–Pliensbachian
boundary: the Pliensbachian successions were deposited in the
central-western areas of the Trento platform whereas, elsewhere
in the same platform and in the northern Friuli platform,
Pliensbachian units are missing, replaced by an unconformity
surface covered by crinoidal sands that have also been
found in the subsurface. The Belluno Basin is recognizable in
seismic profiles under the Veneto Plain. Southward (northern
Adriatic Sea and Po plain), the basin between the Trento and
the Friuli platforms, here called the “northern Adriatic Basin,”
possesses a stratigraphy different from that of the Belluno
Basin. The northern Adriatic Basin drowned later, and seismic profiles indicate that it was wider and bounded by groups of
small synsedimentary faults instead of the major faults displacing
the Belluno Basin. The northernAdriatic Basin can be interpreted
as the northeastern extension of the Umbro-Marchean Basin of
central Italy
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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