1,722,263 research outputs found
Gamma-ray bursts within fireshell model
Full text linkThis thesis is mainly focused on careful data analysis of different parts of high-energy (sub-keV--GeV) spectra of gamma-ray bursts. All the interpretation works are based on the theoretical ground of the fireshell paradigm which is being continuously developed for over 20 years.
The chapters in the main body of the thesis focus on current research and results obtained and published. A distinct emphasis on spectral bands is expressed through structural division of the thesis: soft gamma-ray emission, x-ray afterglow emission and high-energy gamma-ray emission.
In Chapter 2 we discuss theoretical and observational evidences which have been recently gained for a two-fold classification of short bursts within the fireshell working paradigm. We present three additional S-GRBs, 081024B, 090510 and 140402A, following the already identified S-GRBs, i.e., 090227B and 140619B.
In Chapter 3 we analyze the early X-ray flares in the GRB "flare-plateau-afterglow" (FPA) phase observed by Swift-XRT. We claim that the FPA occurs only in one of the subclasses---binary-driven hypernovae (BdHNe). This subclass consists of long GRBs with a carbon-oxygen core (CO_core) massive star and a neutron star (NS) binary companion as progenitors.
In Chapter 4 we examine a scenario when in binary system of neutron star (NS) and massive CO_core star, the latter undergoes a supernova (SN) explosion. A black hole (BH) subsequently originates from the gravitational collapse of the NS caused by hypercritical accretion of the SN ejecta. We infer a new asymmetric morphology for the BdHNe system where the GeV emission occurs within a cone of half-opening angle approximately 60 degrees normal to the orbital plane of the binary progenitor. We confirm that GeV luminosity light curves follow the universal power-law with index of -1.19 +/- 0.04, and from this we further estimate the spin-down rate of the BH
Le partnership pubblico-privato per il finanziamento e la gestione di infrastrutture pubbliche
No full textAnalisi delle principali caratteristiche delle partnership pubblico privato per la realizzazione di investimenti pubblic
Un graffito su uno skyphos attico da Monte Iudica (CT)
No full textThe author examines a graffito found on the foot of a black-glazed Attic skyphos. The vase was part of the burial
assemblage of a chamber tomb datable to the first half of the fifth century BC. After a brief description of the find context, a
Sikel-Greek necropolis in eastern Sicily, the author goes into a morphological and typological study of the skyphos and a
paleographical analysis of the graffito. He finally discusses possible readings and interpretations of the inscription
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
Il PHerc. 1471 (Filodemo, La libertà di parola) nelle Carte Vogliano
No full textContributi di Achille Vogliano all'edizione dell'opera di Filodemo Περὶ παρρησίας (PHerc. 1471
Lettere di Christian Jensen A Achille Vogliano e a Hermann Diels
No full textThree letters addressed by Christian Jensen to Achille Vogliano (1, 2) and Hermann Diels (3), which refer to preliminary works on Philodemus' On Death Book 4 and to the edition of Philodemus' On Poems Book
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
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