1,721,055 research outputs found
Valutazione della trasmissione dei carichi protesici mediante la fotoelasticità a riflessione
No full textEvaluation of load transmission by distal-extension removable partial dentures by using reflection photoelasticity
No full textEsame comparativo di vari tipi di protesi rimovibile mediante la fotoelasticità a riflessione
No full textGround-state properties of the disordered Hubbard model in two dimensions
No full textWe study the interplay between electron correlation and disorder in the two-dimensional Hubbard model at half filling by means of a variational wave function that can interpolate between Anderson and Mott insulators. We give a detailed description of our improved variational state and explain how the physics of the Anderson-Mott transition can be inferred from equal-time correlations functions, which can be easily computed within the variational Monte Carlo scheme. The ground-state phase diagram is worked out in both the paramagnetic and the magnetic sector. Whereas in the former a direct second-order Anderson-Mott transition is obtained, when magnetism is allowed variationally, we find evidence for the formation of local magnetic moments that order before the Mott transition. Although the localization length increases before the Mott transition, we have no evidence for the stabilization of a true metallic phase. The effect of a frustrating next-nearest-neighbor hopping t' is also studied in some detail. In particular, we show that t' has two primary effects. The first one is the narrowing of the stability region of the magnetic Anderson insulator, also leading to a first-order magnetic transition. The second and most important effect of a frustrating hopping term is the development of a "glassy" phase at strong couplings, where many paramagnetic states, with disordered local moments, may be stabilized
Dentin-dentinal adhesive interaction. Calorimetric measurement[Interazione adesivi dentinali-dentina. Misure calorimetriche.]
No full textAmong the tests employed to evaluate the bond strength between dentine and dental adhesives (tensile or shear bond strength measurements, marginal leakage measurements) a general accordance on their reliability cannot be found. Calorimetric measurement may be useful in deciding if the adhesion is mechanical or chemical. In this preliminary study, calorimetric measurements have been performed on three adhesive systems commonly employed: Scotchbond, Gluma, Dentin Adhesit. A calorimeter, equipped with reaction vessels which allow the contact between the two reactants after the thermostatisation has been reached, was used. A thermal effect was observed in all cases, greater for Scotchbond and Gluma, poor for Dentin Adhesit. These values are the sum of different contributes of various reaction path
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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