1,721,024 research outputs found
Change of ballistic movement after two different knee anterior cruciate ligament reconstruction techniques
No full textLa ricostruzione del legamento crociato anteriore effettuato con tendine rotuleo autologo oppure con semitendini comporta due diversi tipi di adattamento funzionale sia in termini muscolari che propriocettivi. In questo studio sono stati presi in considerazione 2 gruppi composti ciascuno da 15 soggetti di sesso maschile praticanti attività sportiva di cui, il primo, ha subito una ricostruzione di legamento crociato anteriore con tendine rotuleo autologo (GTR), ed, il secondo, con semitendini (GST).
Obiettivo dello studio è stato quello di monitorare i deficit esistenti al termine del percorso di recupero (follow up a 150 giorni) tra arto sano ed arto leso nei due differenti gruppi.
I risultati del follow up sui due gruppi osservati ha evidenziato una significativa differenza tra arto sano ed arto leso nel parametro relativo alla massima accelerazione negativa (44.99 6.41%, p<0.001) nel GST ed una significativa differenza relativamente al parametro massima forza di impatto al suolo (11.45 3.17%, p<0.001) nel GTR.
I due gruppi hanno mostrato un diverso pattern di adattamento funzionale alla fine del periodo riabilitativo post-chirurgico, che suggerisce come le due tecniche ricostruttive necessitino, in tal senso, di un’attenzione particolare nella stesura dei programmi riabilitativi post-chirurgic
Sunlight-curable boehmite/siloxane-modified methacrylic based nanocomposites as insulating coatings for stone substrates
Full text linkAn organo-modified boehmite (OMB) was used to prepare solvent-free, hydrophobic and thermal insulating sunlight curable nanocomposites, based on an innovative photo-polymerizable siloxane-modified methacrylic formulation. A deep analysis of the selected nano-filler was first performed by Wide-Angle X-ray (XRD), Scanning Electron Microscopy (SEM) and thermo-gravimetric analysis (TGA). Then, a small amount (i.e. 3 pph) of the nano-filler was dispersed in the organic formulation in presence of a mix of photo-initiators, the latter being able to activate the curing reactions upon sunlight exposure. The rheological behavior of the unfilled and nano-filled formulations was studied, verifying that the presence of the nano-particles does not hinder the field of application of the liquid product. The kinetics of the radical photo-polymerization reactions, induced by solar radiations, was, then, studied by both Fourier Transform Infrared spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC), in order to evaluate the effect of boehmite particles on the kinetics of reaction. Glass transition temperature, thermal conductivity, transparency, surface hardness, hydrophobicity and UV resistance of the systems, produced as thin samples on an aluminum substrate and photo-polymerized in air, were measured. The presence of boehmite nano-particles was found to increase the Shore D hardness of the polymeric matrix, to reduce its thermal conductivity and to increase the transparency of the nanocomposite film.
The thermal insulating properties of the OMB filled coating, along with its excellent hydrophobic characteristics, suggested its potential applications in the field of construction/Cultural Heritage protection as hydrophobic/insulating coating. In order to explore this possibility, a preliminary experimental study was carried out assessing the protective performance of the nanocomposite when applied on calcareous stone substrates
A computational study on crack propagation in bio-inspired lattices
No full textA computational preliminary study on the fracture behaviour of two kinds of finite-size bio-inspired lattice configurations is presented. The study draws inspiration from recent investigations aimed at increasing the fracture energy of some materials through small modifications of their microstructure. Nature provides several examples of strategies used to delay or arrest damage initiation and crack propagation. Striking examples are provided by the micro- architecture of several kinds of wood. In this study, the effects on crack propagations induced by architectural alterations inspired by the microstructure of wood are computationally investigated. In an age in which tight control of the micro-architecture can be achieved, e.g. through high-resolution 3D printing, it is of interest to investigate whether, starting from a baseline cellular architecture, it is possible to achieve superior material performance by simple but smart topological modifications
Sunlight curable boehmite/siloxane-modified methacrylic nano-composites: An innovative solution for the protection of carbonate stones
No full textReference values in complete blood count, bone marrow cells and indices in Sprague-Dawley rats considerino age and sex
No full textEstimating variable association in contingency tables through probabilistic expert systems when samples are drawn according to stratified sampling designs
No full textThis article focuses on the learning algorithms of a PES structure, given
a sample of observations from a finite population, drawn according to a stratified
sample design. The structural learning algorithms can be of two typologies:
the score+search and the constraint based algorithms. Here we focus on the
score+search case, for which the most likely structure, given the observed data, will
be identified optimizing an objective function (typically a penalized likelihood), by
means of optimization methods that, in this case, will be given by the greedy search
and the genetic algorithms ones. Structural learning will be tackled considering the
necessary networks for one class of estimators (named E-PES estimator) built over
a PES that includes the variables of interest and the design variable
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
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