1,721,187 research outputs found
Acceso endodóntico. Experiencia preclínica en molares inferiores
No full textPóster presentado en las jornadas estudiantiles del 2015Fil: Spina, R. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Endodoncia. Buenos Aires, Argentina.Fil: Puca, C. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Endodoncia. Buenos Aires, Argentina
Connessioni mafiose. Uno studio sulle reti sociali 'ndranghetiste
Full text linkConnessioni mafiose. Uno studio sulle reti sociali ‘ndranghetiste.
Raffaella Gallo
In un’ottica di studio applicato della fenomenologia mafiosa, il lavoro propone la definizione di una precisa prassi analitica che, attraverso l’utilizzo di differenti metodologie di ricerca sociale, permetta di descrivere la configurazione delle cosche mafiose e i processi relazionali alla base della formazione di tali consorterie, che, per loro natura, si presentano oscure e tendenzialmente inaccessibili allo sguardo di un osservatore esterno.
Definito l’oggetto d’indagine da un punto di vista teorico, il lavoro illustra la una proposta metodologica, che parte da una fase di raccolta dei dati che consiste nella lettura di una serie di atti giudiziari riguardanti le cosche attive sul territorio di Lamezia Terme, comune in provincia di Catanzaro, e nella costruzione di un database in cui vengono organizzate le informazioni sui soggetti citati nei documenti, sulle attività criminali o meno svolte per conto della cosca, sugli eventi considerati significativi durante l’attività investigativa condotta dagli inquirenti e sulle relazioni di varia natura che i soggetti instaurano tra loro.
Raccolte ed organizzate le informazioni disponibili degli atti giudiziari, l’analisi dei dati che inizia con una descrizione statistica del sotto-campione degli affiliati attraverso la costruzione di una matrice casi per variabili. Nello specifico, le variabili sono state selezionate secondo tre dimensioni descrittive: le caratteristiche socio-anagrafiche, le caratteristiche d’affiliazione (cosca d’appartenenza, discendenza mafiosa, etc.) e, infine, le caratteristiche posizionali del soggetto all’interno dell’organizzazione criminale (attività svolte, grado gerarchico, legami rituali, etc.).
Nell’idea che uno studio empirico sulla criminalità organizzata non sarebbe in alcun modo esaustivo se fosse limitato all’utilizzo di metodologie tradizionali – orientate all’analisi degli attributi individuali più che alle dinamiche relazionali che guidano l’associazione degli individui tra loro –, adottando un approccio metodologico integrato, che accordi gli strumenti di ricerca “classici” e gli strumenti della Social Network Analysis, un secondo momento analitico è dedicato allo studio delle dinamiche relazionali insite del sistema mafioso. Questa scelta metodologica dipende all’idea che la prospettiva di rete riesca a cogliere al meglio le specificità di un fenomeno sociale che, come la mafia, è caratterizzato dalla combinazione di molteplici forme di associazione. Il lavoro propone un’analisi di rete, a sua volta, articolata in due fasi analitiche: la descrizione e l’analisi dell’intero reticolo, attraverso il calcolo delle statistiche di rete, e dei profili dei soggetti più rilevanti che agiscono al suo interno, attraverso il calcolo degli indici di centralità; l’analisi dei legami che compongono la rete mafiosa, condotta con l’individuazione dei diversi tipi di relazione e l’elaborazione di un indice sintetico che permetta di distinguere i legami forti dai legami deboli.
In ultimo, si dedica un breve spazio alla descrizione dei profili di coloro che sono usciti dal sistema mafioso, i collaboratori di giustizia, e alla descrizione di una particolare situazione vissuta dalle cosche lametine che, negli ultimi anni, ha visto il proliferare delle collaborazioni di giustizia. Osservando tale situazione, si è cercato di individuare le condizioni che hanno creato terreno fertile per quello che è stato definito un “pentitismo a catena”.
L’osservazione dei diversi aspetti considerati – gli attributi individuali e relazionali degli affiliati e le caratteristiche relazionali della rete – ha riconosciuto il concetto di capitale sociale mafioso, nelle sue diverse forme, come filo conduttore analitico per individuare i punti di forza e di debolezza delle cosche mafiose, quindi, per immaginare una strategia di contrasto “scientificamente orientata” al fenomeno, che presupponga un’azione combinata tra scienza e investigazione giudiziaria
Experimental investigation of laser beam welding of explosion-welded steel/aluminum structural transition joints
No full textThe steel/aluminum structural transition joints are widely used in shipbuilding industry due to the advantages of joining these two materials with important weight savings while exploiting their best properties. The use of laser welding to strongly connect components made of Fe and Al alloys as base materials with Fe/Al structural transition joints is very attractive. The authors report results achieved during the laser welding of these particular joints with the scope to evaluate effects of the laser-induced thermal loads on the integrity of the Fe/Al bond interface, from metallurgical and mechanical points of view. The increase of both inter-metallic film thickness and extension were detected as a result of the laser beam induced heat on the Fe/Al bond interface. These increases did not cause severe reductions of the mechanical resistance of the investigated structural transition joint
Dimensional Variation in MIM Components
No full textThe aim of the present work was to evaluate process parameters influencing the dimensional variation of AISI 316L MIM components during manufacturing. 3D Finite Element (FE) models were used to reproduce thermal and mechanical stress/strain fields during molding of MIM components. In addition, experimental plans were used to reinforce outcomes of numerical simulations. The developed models predicted the thermal history of the injection molding process phase and temperature distributions for any position in the component. This research confirmed that FE simulations were an efficient method to assess the influence of process parameter variation on component manufacturability, suggesting adjustments to improve its quality. The use of the FE models allowed the process efficiency to be improved, as well as MIM component quality
Evaluation of filling conditions of injection moulding by integrating numerical simulations and experimental tests
No full textThe authors propose an integrated approach to evaluate gating system configurations to optimize the filling conditions of thermoplastic injection moulded parts. Through data integration between the finite element (FE) analysis and the Design of Experiment approach, the filling of parts with complex geometries was studied to optimize injection process parameters and improve the product quality.
The numerical simulation of an injection moulding process allows the evaluation of the component manufacturability at the early stage of the development cycle, without fabricating prototypes and minimizing experimental tests. Normally, the FE analysis interests concerns filling, post-filling and cooling phases of the injection process. Using the FE system, a deeper investigation of stress and strain distributions can be performed to predict defect presence in the final product. However, this methodology is sensitive to existing differences between property of the real part and of its model (material, geometry, etc.)
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
Telemanufacturing of reverse engineered parts: a case study
No full textA product idea is normally transferred between designers and/or manufacturing engineers using digital models. Engineering analyses are directly, connected with the presence of these models and only limited to virtual evaluations. For this reason, the use of real,prototypes is very important in the first design stage in order to perform a deeper product evaluation. A very attractive way to update product designs while realizing prototypes is offered by the direct data communication between reverse engineering (RE) and rapid prototyping (RP). In this way the reproduction of aesthetic prototypes in different geographical. positions, becomes a key factor for successful' competition. In this article, the authors investigation the efficiency of the data transfer between RE and RP systems in order to speed up product development without sharing design intent. A: specialized software tool is described in order to perform Product shape acquisition, elimination of, redundant point cloud data, retriangulation of the point loud and generation of a machine file for RP fabricatio
Multiscale Modeling of Polymer Crystallization
No full textThe crystallization process during
filling and cooling in an injection molding
process is investigated. The numerical methods,
crystallization models and their implementation
into a simulation chain with COMSOL and
SphäroSim software are describe
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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