1,721,070 research outputs found
Ferroelectric and structured phases from polar tapered mesogens
No full textWe investigate the effect of changing the molecular dipole strength on the liquid crystal phases formed in a system of tapered Gay-Berne particles with an axial dipole. We show that increasing the strength of the dipole has a profound effect on the stability and molecular organisation of the phases and eventually destroys the polar ferroelectric nematic
Conjunto de datos higrotérmicos y gráficas de confort del monitoreo de invierno en el Edificio municipal "Distrito Centro" de la ciudad de Rosario, provincia de Santa Fe
No full textConjunto de datos resultado de una auditoría de invierno realizada al edificio municipal "Distrito Centro" de la ciudad de Rosario, provincia de Santa Fe (Argentina).Fil: Basualdo, David Ezequiel. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Berardi, Roberto Nino. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Birche, María Belén. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Czajkowski, Jorge Daniel. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Laboratorio de Arquitectura y Hábitat Sustentabl
Conjunto de datos higrotérmicos de auditoría energética de verano realizada al edificio municipal "Distrito Centro" en Rosario, Santa Fe
No full textConjunto de datos higrotérmicos de un edificio municipal de la ciudad de Rosario, provincia de Santa Fe (Argentina), correspondiente a la campaña 2022.Fil: Basualdo, David Ezequiel. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Berardi, Roberto Nino. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Birche, María Belén. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Czajkowski, Jorge Daniel. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; Argentina.Fil: Gómez, Analía Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Arquitectura y Urbanismo. Laboratorio de Arquitectura y Hábitat Sustentable; ArgentinaLaboratorio de Arquitectura y Hábitat Sustentabl
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
From rod-like to disc-like Gay–Berne biaxial nematics and back
No full textBy means of Monte Carlo simulations at constant pressure and temperature, the phase behaviour of pure systems of soft biaxial Gay–Berne ellipsoids, prototypical models for thermotropic mesogens, was determined as a function of temperature and three different pressures. To reduce the number of free shape and energy parameters to only one, the medium ellipsoid axis σx, particles possessing identical total volume and length σz were studied, with interactions parameterised in terms of products of axes lengths. The resulting phase diagrams present a variety of crystalline and liquid crystalline phases characterised by different biaxiality and preferential axis alignment, with GB particles behaving like rods for more elongated shapes, and like discs for more squashed ones. In agreement with previous simulation and theoretical studies using simpler models, the transition between rod to disc behaviour (and back) occurs approximately when the so-called dual-shape condition is reached, i.e. when σx = √σyσz. This shape ideally identifies also the position of a Landau point, in which at a specific temperature, isotropic, calamitic nematic, discotic nematic, and biaxial nematic may coexist, and hence a direct isotropic to biaxial nematic transition could in principle occur. We did not observe such event in our simulations
On the field-induced switching of molecular organization in a biaxial nematic cell and its relaxation
No full textWe investigate the switching of a biaxial nematic filling a flat cell with planar homogeneous anchoring using a coarse-grained molecular dynamics simulation. We have found that an aligning field applied across the film, and acting on specific molecular axes, can drive the reorientation of the secondary biaxial director up to one order of magnitude faster than that for the principal director. While the pi/2 switching of the secondary director does not affect the alignment of the long molecular axes, the field-driven reorientation of the principal director proceeds via a concerted rotation of the long and transversal molecular axes. More importantly, while upon switching off a (relatively) weak or intermediate field, the biaxial nematic liquid crystal is always able to relax to the initial surface aligned director state; this is not the case when using fields above a certain threshold. In that case, while the secondary director always recovers the initial state, the principal one remains, occasionally, trapped in a nonuniform director state due to the formation of domain walls. (C) 2015 AIP Publishing LLC
Can off-centre mesogen dipoles extend the biaxial nematic range?
No full textWe have investigated the possibility of extending the stability range of the biaxial nematic phase by adding an off-centre dipole of various strengths and orientations to elongated biaxial Gay-Berne (GB) mesogens yielding a relatively narrow biaxial nematic (Nbx) phase, and a smectic (Sbx) phase when dipole-less. The effect of dipoles is not easy to predict, and our previous investigations have shown the limited benefits of having a central dipole. Here we show, employing molecular dynamics (MD) simulations, that a not too strong off-centre dipole positioned along the longest axis of the nematogen can extend the temperature range of stability of the biaxial nematic phase, also shifting it towards lower temperatures
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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