1,721,000 research outputs found
Sulla tomba odierna di papa Eugenio IV, già appartenuta a Francisco des Prats, “cardinale di León”, e sul suo autore principale, Matteo Pellizzone da Milano
No full textHigh-strength steels for the automotive sector: A simple austenite transformation model for continuous annealing and galvanizing lines
No full textIn continuous annealing and hot-dip galvanizing processes, the final steel structures heavily depend on the process parameters (e.g. times and temperatures), which, thus, must be accurately tuned. In particular, the short-term permanence in a two-phase ferrite + austenite field and the following cooling process have a strong impact and can be very articulated, according to the plant type. Therefore, it is extremely useful to have practical and simple models estimating the austenite transformation based on the undergone thermal cycle. Actually, the process speed, especially for the cooling stage, implies that standard CCT curves are not applicable for determining the final structure. This work presents a solution exploiting a simple metallurgical-mathematical model. Such model, on the basis of experimental tests and starting from the chemical composition and the thermal cycle, estimates both the final structure and the mechanical properties of Advanced High Strength Steels, which are of utmost interest in the automotive sector
Un ritratto di Bartolomeo Passerotti ritrovato
No full textL’articolo presenta un Ritratto d’uomo in armatura, appartenente a un collezionista e da tempo assente dall’attenzione degli studiosi, attribuendolo a Bartolomeo Passerotti. Si tratta di un’opera di notevoli dimensioni (cm 125 x 94), che nel 1934 fu attribuita da Giuseppe Fiocco a Paolo Veronese, ma più tardi prudentemente allontanata dal pittore veneto da Terisio Pignatti. Lo studio mostra come l’opera sia ascrivibile a Passerotti su base stilistica, anche grazie al confronto con altri ritratti di certa autografia del pittore bolognese, ne individua i tratti peculiari, e ricorda come già Federico Zeri negli appunti sul retro della foto conservata nella sua fototeca si fosse orientato verso questa lettura. Da ultimo esamina in breve l’iscrizione, che riporta il nome dell’effigiato (“Angelo Suriano”) e ne ricostruisce in breve la biografia
Ferdinando Galli Bibiena. Dalla prassi alla traduzione incisoria
No full textLe incisioni sono state a lungo, dalla scoperta della stampa in poi, un diffuso e privilegiato mezzo di studio, di aggiornamento, di comunicazione, lo sono tuttora. Prima della fotografia, hanno rappresentato un significativo strumento di confronto fra gli stili, una via di conoscenza utile all’apprendista artista all’interno delle botteghe e delle accademie, utile anche al conoscitore per affinare le sue consapevolezze, oltre che mezzo di documentazione dinastica. Ferdinando Galli Bibiena le utilizza sia quale memoria dinastica in occasioni principesche all’interno delle corti italiane ed europee, sia quale via didattica.
Il pittore figurista Giuseppe Antonio Caccioli (1672-1740), in Varie opere di Prospettiva inventate da Ferdinando Galli d.o il Bibiena, Bolognese Pittore e Architetto dell’A. SS.ma del Sig.re Duca di Parma, Raccolte da Pietro Abbati, et intagliate da Carlo Antonio Buffagnotti, rappresenta l’Architettura, la Pittura, la Fama, il genietto reggi corone, e tutti coinvolge nell’elogio di Ferdinandus de Gallis dictus Bibiena bononiensis pictor architectus serenissime ducis Parme. Ferdinando è ritratto a mezzobusto nell’ovale al centro dell’incisione
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
Hydrogen embrittlement in high strength fasteners: Comparison between bainitic and tempered martensitic steels
No full textThe scope of this work is to explore innovative microstructure typologies, as well as heat treatments, for the manufacturing of high-strength steel fasteners aimed at obtaining a reduced susceptibility to hydrogen embrittlement. The research evaluates the role of microstructure and the notch tensile strength (RNTS) in relation to the geometry tested on hydrogen embrittlement of steels used in fasteners production. High-strength steel fasteners are increasingly used especially in Automotive industry to mechanically join parts together, increase vehicle performance and promote car weight reduction. High-strength steel fasteners, included in property class 12.9 and higher, are characterized by an ultimate tensile strength above 1200 MPa, despite the remarkable mechanical performance they are historically prone to hydrogen embrittlement phenomena. The phenomenon of hydrogen embrittlement is widely investigated, characterized by its unpredictability and its ability to result in brittle fractures. In this study, slow strain rate tensile tests were conducted to investigate and compare the effect of internal hydrogen concentration on the mechanical properties of fasteners with martensitic microstructure in property classes 10.9and 12.9, as well as innovative high strength fasteners with bainitic microstructure in property class 12.9U. The commonly utilized methodologies for assessing hydrogen embrittlement in fasteners are standardized procedures primarily focused on mechanical tests conducted on finished fasteners. They do not effectively differentiate the influence of surface treatment from material selection and fastener design. For this reason, during the present research, a simpler, faster and very promising methodology has been used. This procedure could be the basis for developing a new Standard guideline for prevention of hydrogen delayed fracture. Additionally, SEM fractography has been interpreted according to the well-known HELP and HEDE models
A predictive approach to case hardening steel design|Un approccio predittivo al design degli acciai da cementazione
No full textAppropriate 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
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