1,720,996 research outputs found
Slow dynamics of banana-shaped molecules: a theoretical approach to analyze 2H-NMR T2 relaxation times
No full textIn the present work, we analyze pulsed deuterium NMR experiments performed on the isotropic and nematic phases of the banana-shaped liquid-crystalline mesogen 4-chloro-1,3-phenylene bis {4-4'-(11-undecenyloxy) benzoyloxy} benzoate (ClPbis11BB) selectively deuterated on the central ring. Starting from a previous evidence of unusual slow dynamics in the isotropic phase (Domenici V. et al., J. Phys. Chem. B 2005, 109, 769), a quantitative and model-supported analysis of the deuterium NMR data is performed here by accounting for slow- motional modulation of the magnetic anisotropies through the full solution of the stochastic Liouville equation. Focusing on the quadrupolar echo experiments performed in the nematic phase, the analysis of the transverse relaxation rate has been carried out by considering single-molecule motions and fluctuations of the local director. The main conclusions are: (a) director fluctuations are not relevant on driving the signal relaxation; (b) molecular reorientations about transverse axes control the dynamic regime of the signal relaxation and impose a full slow-motional treatment; (c) the small amplitude tumbling of the molecule within the wells of orientational potential occurs with characteristic times up to the microsecond. The outcome of our analysis has to be taken as indicative of very slow dynamics concerning out-of-plane motions of the molecules. Besides the specific application, this paper also offers the methodological tools to treat the pulsed deuterium NMR experiment in the slow- motional regime of reorientational motions and provides a detailed comparison with the usually employed fast-motional approximation
La rappresentazione complessa della disabilità nel cinema contemporaneo. Analisi de Le Scaphandre et le Papillon di Julian Shnabel
No full textNel corso del tempo la rappresentazione della disabilità nel cinema ha subito una evoluzione che è stata analizzata da diversi studiosi sia in ambito nazionale che internazionale. In accordo con quanto riscontrato nella letteratura scientifica attuale (si pensi alla prospettiva dei Disability Studies, dell'ICF, del Capability Approach), si è assistito ad un progressivo spostamento di focalizzazione dell'attenzione da parte dei cineasti: a) dalla descrizione del deficit alla rappresentazione della persona in quanto tale, con la sua rete di relazioni nei diversi contesti di appartenenza; b) dalla tipizzazione entro categorie ben precise di rappresentazione – sia in relazione al soggetto disabile (l'eroe, l'innocente, la vittima, ecc...) sia in riferimento agli scopi intrinseci sottesi alla trama del film (la denuncia, la valorizzazione, ecc...) – a una concettualizzazione più dinamica e complessa dei temi trattati. Sulla base di questa premessa gli autori presentano, quindi, una lettura complessa del film Le Scaphandre et le Papillon (Julian Shnabel, 2007), che esemplifica in maniera significativa questo nuovo modo di portare sugli schermi il tema della disabilità.National and international experts have analysed the representation of disabilities in movies and its evolution over time. Current scientific literature (i.e. Disabilities Studies, ICF, Capability Approach) shows that filmmakers have gradually changed their focus: a) from the description of the disability to the representation of the disabled person, with his/her network of relationships in the contexts he/she belongs to; b) from the representation of well-defined categories – regarding both the disabled person (a hero, an innocent, a victim, etc...) and the goals underlying the plot (complaint, valorisation, etc...) – to a more dynamic and complex conceptualisation of the topics developed in the movies. Starting from this introduction, the authors engage in a complex reading of the movie Le Scaphandre et le Papillon (Julian Shnabel, 2007), in which this new way of tackling disabilities on the screen is significantly represented
La Ricerca-Formazione come risorsa per sviluppare leadership diffusa e qualificare la didattica nelle Reti di scuole
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Potere, partecipazione e lavoro interprofessionale nelle Unità di Valutazione Multidimensionale Disabilità (UVMD) in Toscana: primi esiti da una ricerca empirica
No full textIl volume raccoglie i numerosi contributi presentati nella Giornata della Ricerca 2023, nell’ambito delle attività del Dipartimento di Scienze della Formazione dell’Università Roma Tre. Il lavoro, in un’ottica interdisciplinare ormai irrinunciabile per la ricerca, soprattutto nelle scienze dell’educazione e della formazione, testimonia un articolato panorama di progetti, metodologie di ricerca ed esiti che si muovono all’interno delle seguenti macro-aree tematiche: processi educativi e formativi; dimensioni storiche e mutamento socio-culturale; mobilità e accoglienza. I contributi raccolti, in una prospettiva di inclusione scolastica e sociale, promuovono la messa a punto di soluzioni scientificamente fondate per fronteggiare il fenomeno dell’emarginazione e affrontare i molteplici problemi che coinvolgono in particolare insegnanti, formatori e operatori nei servizi socio-educativ
Bending actuation of a composite liquid crystal elastomer via direct Joule heating
No full textIn this work a new bi-layered composite actuator based on a polysiloxane-based monodomain nematic Liquid Crystal Elastomer (LCE) and on a conductive PEDOT:PSS thin layer is proposed. The basic idea is to integrate electroconductive properties in the LCE and to validate the feasibility of direct actuation of the LCE by Joule heating of the conductive (and compliant) PEDOT:PSS layer. The fabrication of the actuator is achieved by depositing a thin conductive polymer layer by drop casting a PEDOT:PSS waterborne solution after having increased the LCE surface wettability with an air plasma treatment. The excellent stability of PEDOT:PSS and its mechanical properties, better matched with LCE ones compared to metals or inorganic nanoparticles used in other approaches, allowed to develop an all-organic reliable actuating composite based on thermoresponsive properties of LCE. Thermal actuation via direct Joule heating of the composite has been verified and prototypes of LCE/PEDOT:PSS bending actuators have been preliminary tested. © 2012 IEEE
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
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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