1,722,491 research outputs found
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
31) Emilio Balletti, I controlli a distanza dei lavoratori dopo il jobs act, in F. Santoni, M. Ricci, R. Santucci, Il diritto del lavoro all'epoca del jobs act, Napoli, 2016, pagg. 37-50 (ISBN 9788849531633)
No full textAnalysis of boundary layer separation phenomena by infrared thermography - Use of acoustic and/or mechnical devices to avoid or reduce the laminar separation bubble effects
No full textAerodynamic bodies operating at low Reynolds numbers are normally subjected to local boundary layer separation phenomena; these strongly modify airfoils behavior. The body geometry and the incoming flow angle of attack define the pressure pattern over the surface in a way that there will be sections with a favorable pressure gradient and others with a negative one, the latter causing the flow to slow down and sometimes to separate. A laminar separation, followed by a turbulent transition in the separated shear layer and a subsequent turbulent reattachment, causes the Laminar Separation Bubble (LSB) phenomenon. The LSB presence induces an aerodynamic drag increase and an efficiency decrease; this problem is of interest in many application fields including wind turbine energy production, where a LSB may induce less energy output and occasionally mechanical problems due to pulsating pressure variations (bubble bursting phenomena). This paper illustrates an infrared measurement approach, useful for the instantaneous observation of the boundary layer pattern on an airfoil surface, as well as an analysis of the effects of both an acoustic and a mechanical system on the behavior of the LSB. These latter induce disturbances in the developing boundary layer in order to promote the turbulent transition and contrasting the LSB presence. The first one involves the use of a subwoofer and the analysis is performed on an Eppler 205 airfoil; the second one makes use a Micro Electro Mechanical System (MEMS) and the IR observation is carried out on a WT01 airfoil developed for small wind turbines (about 1 kW). The results show a pronounced effectiveness for both the methodologies particularly when using MEMS
Analisi mediante termografia IR dei fenomeni di separazione dello strato limite su corpi aerodinamici
No full textConvergence of a Nonlinear Reaction Diffusion Problem to a Free Boundary
No full textAbstract. We prove existence and uniqueness of classical solutions of a one-dimensional free boundary problem for the heat equation with a jump conditions for the flux. We show that the solution of this problem can be obtained as a limit of a reaction-diffusion problem when the source term \converges" to a Dirac measure
Lifestyles and history of use of drug abusers in four EU countries: exploratory analysis of survey data
No full text
Studio e simulazione di tecniche per il riconoscimento di persone mediante radar e analisi di spettrogrammi
No full textL’attenzione sempre maggiore dell’opinione pubblica verso problematiche di sicurezza ha contribuito
in questi anni a dare un forte impulso alla ricerca di sistemi innovativi di sorveglianza dotati di
potenzialità nuove e maggiori. In questo contesto si sono inseriti prepotentemente i sistemi radar. Nati
in ambito militare per il ranging di obiettivi quali navi e aerei, si stanno oggigiorno affermando nel
campo dell’“human detection and identification”. Rispetto alle tecniche di riconoscimento
tradizionali, i sistemi di visione in primis, la tecnologia radar permette di rilevare una persona anche
attraverso ostacoli non trasparenti. In particolare, l’uso di radar ultra wide band (UWB) permette di
penetrare ostacoli come muri, macerie e neve, e di rilevare movimenti anche di piccola entità. Questo
aspetto rende i radar interessanti anche per operazioni di soccorso e recupero di essere umani
intrappolati in luoghi ostili. Un possibile svantaggio nell’uso dei sistemi radar è la difficoltà di
interpretazione dei risultati che essi forniscono, soprattutto se confrontati con le immagini fornite dai
più classici sistemi di visione, di più immediata comprensione. Lo scopo della memoria è di illustrare
le potenzialità di una metodologia di elaborazione e misurazione, denominata doppler processing, che
consente non solo di rilevare la presenza di una persona, ma pure di estrapolarne informazioni più
dettagliate al fine di consentirne una identificazione
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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