1,720,959 research outputs found
Indagini sulle reliquie attribuite a "san Luca Evangelista", Basilica di Santa Giustina in Padova: studio micropaleontologico dei depositi alluvionali rinvenuti nella bara plumbea
No full textThe sarcophagus of the coffin containing remains attributed to St. Luke Evangelist has various encrustations of sedimentary (terrigenous) origin. The walls reveal three layers, probably the result of three successive submersions. Ten samples were taken from these encrustations, and their coarse and fine fractions were analysed. The coarse fraction contains many organic remains, including microscopic crustaceans (ostracods), probably from a freshwater environment, and transparent spherules (perhaps pollens or spores). The presence of ostracods and “pollens” indicates prolonged contact with fluvial and lacustrine/marshy waters. The fine fraction contains fossil limestone phytoplankton (calcareous nannofossils) belonging to three different epochs (Cretaceous, Paleocene-Lower Oligocene, Pliocene-Present), well represented in formations in the Veneto area. These last data indicate that the coffin was submerged and remained under water several times in the Paduan area
Materiali e Tecnica delle pitture murali romane in Grecia - Parte seconda
No full textSi completa qui la pubblicazione della traduzione redazionale della comunicazione dal titolo: "Contribution to studies on roman walla painting materials and techniques in Greece: Corinth, the southeast building" presentata al I° "International Workshop on Roman Wall Painting" tenutosi a Friburgo (Svizzera) dal 7 al 9 marzo 1996 e pubblicata negli atti del congresso alle pagine 105-118. In questa seconda parte trovano spazio lo studio delle pellicole pittoriche, la sintesi dei risultati sui materiali e sulle tecniche di esecuzione e le conclusioni. Di particolare interesse, in questa seconda parte, è il metodo di studio scientificamente rigoroso dei pigmenti. il loro riconoscimento è stato effettuato, infatti, sulla base di parametri ottici, chimici e cristallografici integrati tra di loro. Spicca in particolare lo studio del blu egiziano di cui vengono fornite, tra l'altro, accurate e precise analisi chimiche alla microsonda elettronica e le relative formule strutturali. Si segnala inoltre l'individuazione e la localizzazione delle unità litologiche da cui potevano essere estratti i calcari che, una volta macinati sono stati impiegati come carica negli intonaci di finitura. In conclusione il contributo dimostra che i materiali e le tecniche della pittura romana in Grecia, anche se relativamente poco documentata, non si discostano da quelli in uso in Italia
Proposal of the Global Boundary Stratotype section and Point (GSSP) of the Piacenzian Stage.
No full text
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
The environment of Venice area in the past two million years
No full textA ca. 950 m thick succession that was continuously cored in 1971 in Venice has been revisited, in order to reconstruct the environmental history of the Venice area since about 2.15 Ma. Magnetic polarity stratigraphy, integrated with refined calcareous nannofossil biostratigraphy, provides a firm chronostratigraphic framing of the succession. In order to improve the chronological resolution, we derived astrochronological refinements in the lower Pleistocene sapropel-bearing interval by a comparison with other time-correlative sections in the Mediterranean. The pollen record is used as a proxy of climatic changes and as an indirect tool in the chronological reconstruction in the upper part of the succession. The following history has been inferred: (1) in the late Gelasian (late Pliocene), the depositional area was a strongly subsiding shelf which shoaled to near sea level; (2) following a hiatus of a minimum duration of 0.2 Myr, encompassing most of the Olduvai Subchron, the shelf rapidly drowned to bathyal depths over the early Pleistocene (biozones MNN 19a to 19e: from 1.947 Ma to 0.96 Ma). This interval was characterized by starved sedimentation (less than 10 cm/kyr), represented by hemipelagic muds interbedded with sapropel layers; (3) during most of biozone MNN19f (Pseudoemiliania lacunosa Zone, 0.96–0.42 Ma) a thick package of turbidites was laid down as a result of massive terrigenous input from the eastern Southern Alps; (4) later, in the middle part of Chron 1n (Brunhes), deltaic sedimentation, primarily related to the progradation of the paleo-Po system, led to the progressive infill of the basin. This progradational episode was a major building phase, and ended with the first appearance of continental sediments, tentatively correlated with marine oxygen isotope substage 8.4; (5) the upper part of the succession shows a cyclic organization, with an upward increasing amount of marginal-marine and subaerial deposits. In this interval the Venice area was below sea level during glacioeustatic highstands but became emergent during subsequent major glacioeustatic lowstands. Pollen data support an overall good correspondence of continental sediment packages of sequences with glacial conditions and of maximum flooding intervals with interglacial conditions
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
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