1,720,957 research outputs found
Zn-Al-rich chlorite in interleaved phyllosilicate grains from the low-temperature metamorphic Ordovician terrane of Iglesiente, south-west Sardinia, Italy
No full textZn-Al chlorite with a ZnO content of 2–3 wt% has
been found in the Monte Argentu Formation that belongs to
the external zone of the Variscan Sardinian Belt in SW Sardinia.
This chlorite occurs in metasiltite rocks characterized by
the alternation of dark-coloured layers rich in Fe- and Tioxides
and light-coloured layers rich in quartz and
phyllosilicates. The Zn-Al chlorite is associated with Kwhite
mica, pyrophyllite, and quartz. The most common interleavings
consist of K-white mica+Zn-Al chlorite, K-white
mica+pyrophyllite, K-white mica+Zn-Al chlorite+pyrophyllite,
and Zn-Al chlorite+pyrophyllite. The X-ray patterns of
the <2 μm fraction of the investigated samples are characterized
by peaks for illite, pyrophyllite, chlorite and quartz. Metamorphic
temperatures of 300°–400°C have been estimated on
the basis of the pyrophyllite occurrence. Pressure estimated on
the basis of K-white mica composition is in the 0.3–0.6 GPa
range
The geological map of Sardinia (Italy) at 1:250,000 scale
Full text linkOver the last 25 years the Italian national geological mapping program of the Italian Geological Survey (CARG Project, italian: Progetto Carta Geologica) at 1:50,000 scale has led to significant improvements in the geological knowledge for the Island of Sardinia (Italy). As a result, about one half of the island now is covered by new geological maps with 1:10,000–1:25,000 accuracy and geological maps at the 1:50,000 scale whose explanatory notes are available electronically. At the beginning of the CARG Project a geological map for Sardinia Island at 1:200,000 scale was published [Carmignani, L. (1996). Carta Geologica della Sardegna (1:200.000). Servizio Geologico Nazionale, Regione Autonoma della Sardegna], summarizing all the geological information available at that time, and a book with explanatory notes for the map was later published [Carmignani, L., Oggiano, G., Barca, S., Conti, P., Salvadori, I., Eltrudis, ... Pasci, S. (2001). Geologia della Sardegna: Note Illustrative della Carta Geologica della Sardegna in scala 1:200.000, Memorie Descrittive della Carta Geologica d'Italia (Vol. 60). Roma: Servizio Geologico d'Italia, 283 pp]. The enclosed Geological map of Sardinia at 1:250,000 scale incorporates all maps of the CARG Project, unpublished author studies and recently published maps and represents the most updated synthesis of an area characterised by a complex geological evolution that, with few exceptions, can be considered continuous during the last 540 Ma. The main events that influenced the geology of the island are the Variscan orogen that deeply involved the passive margin of North Gondwana and then the complex episodes that occurred in the present-day Mediterranean area after the accretion of Pangea up to the opening of the Tyrrhenian basin
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
La Geomatica a supporto dell'analisi critica della metodologia PAI in Sardegna.
Full text linkIn un progetto finanziato dall’Agenzia del Distretto Idrografico della Sardegna, si sta conducendo un’analisi critica della normativa e delle Linee Guida del Piano di Assetto Idrogeologico (PAI) relativamente alla sezione che, attraverso l’analisi di specifici indicatori pesati, porta dapprima all’individuazione delle aree potenzialmente instabili e di seguito alle carte di pericolosità e rischio. Il presente lavoro illustra le attività di analisi delle criticità, unitamente allo sforzo di fornire una caratterizzazione più strettamente geologica ai fenomeni di instabilità dei versanti. Nella metodologia attualmente in vigore gli aspetti geologici non contemplano la complessità stratigrafica e geometrica dei territori e dei fenomeni di instabilità. In particolare, la classificazione meccanica delle litologie che viene suggerita, frutto di studi condotti in contesti geologici diversi, non sembra essere coerente con le fenomenologie franose che si sviluppano nell’Isola. Particolare rilevanza viene attribuita all’esposizione dei versanti come concausa di fenomeni franosi, mentre questo aspetto non sembra avere alcuna influenza. Diversamente, emerge una stretta relazione tra litologie, classi di pendenza e sistemi di discontinuità per le frane per crollo e ribaltamento, tipologie di frana più frequenti nell’Isola. Le relazioni tra diverse tipologie di fenomeno franoso, litologie, classi di pendenza e altri parametri geomorfometrici suggeriscono l’importanza di una caratterizzazione basata su parametri differenti della per le diverse tipologie di frana. Ad esempio, per la propensione al ribaltamento risulta poco efficace la relazione tra il deposito di frana così prodotto e il substrato su cui poggia, elemento che è sicuramente più significativo per le frane di scivolamento. L’approccio geologico inteso in senso classico è stato affiancato dal contributo fornito dalla Geomatica per poter analizzare congiuntamente dati digitali nativi (per esempio, modelli di elevazione del terreno ed elaborazioni derivate). Il risultato atteso è ottenere una caratterizzazione geomorfologica dei bacini della Sardegna in funzione delle diverse tipologie di fenomeni franosi
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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