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Influência da geometria da nanocarga na estruturação, orientação e propriedades de filmes tubulares de nanocompósitos de PA6
(Universidade Federal de São Carlos, 2012-06-13) Marini, Juliano; Bretas, Rosario Elida Suman; https://lattes.cnpq.br/2805349172281345; https://lattes.cnpq.br/4533610255047654
The structure and morphology of polymers and consequently their properties are dependent on the processing conditions. During the blown film process, high shear and elongational flows can induce a preferred orientation of the polymer chains; controlling the process conditions, it is possible to obtain films with anisotropic properties. Polymeric nanocomposites have attracted industrial and scientific interest due the possibility of obtaining materials with improved thermal, mechanical, and permeation properties by the addition of small contents of inorganic fillers. This dispersed phase can also be affected by the processing conditions and also develop a preferred orientation, and influence the three-dimensional structure of the composite and its properties. In this work, the influence of the nanoparticle s (NPs) shape and processing conditions on the structure (with emphasis on the orientation characteristics) of polyamide 6 (PA6) nanocomposites blown films was evaluated, by the incorporation of an one-dimensional NP (halloysite HNT, with a hollow tubular structure) and a two-dimensional NP (montmorillonite MMT, with lamellar structure) to the polymeric matrix. Using a constant NP content (fixed above the theoretical percolation threshold) and evaluating the presence or absence of the NP s superficial treatment, blown films were obtained in four different processing conditions, varying the take-up and blow-up ratios (TUR and BUR, respectively) and using a fixed mass flow. Unexpectedly, all the films exhibited a preferred orientation of the crystalline lamellae along the normal direction, i.e., along the film thickness, independently of the processing conditions. This behavior was explained by the cooling conditions and initial preferred orientation of the polymer chains in the annular die exit. On the other hand, the NPs presented a preferred orientation along the flow direction and were well distributed and dispersed through the matrix. The film s thermal dynamicviii mechanic, tensile, permeation and optical behaviors were consistent with the structure observed and significant improvements of these properties were achieved for the films of organically treated HNT and MMT PA6 nanocomposites. Regarding the NP s shape, greater aspect ratio and surface area, in the presence of good interfacial interactions, promoted a greater efficiency of reinforcement.
ACUMAAF: ambiente de computação ubíqua para o monitoramento e avaliação de atividade física
(Universidade Federal de São Carlos, 2012-06-13) Nunes, Douglas Fabiano de Sousa; Souza, Wanderley Lopes de; https://lattes.cnpq.br/3742302894743620; https://lattes.cnpq.br/3268006553416933
The physical inactivity has been indicated by the World Health Organization (WHO) as one of the main risk factors for the incidence of Chronic Non-Communicable Diseases (CNCDs). Millions of deaths in the world are a result of these diseases, and this number has increased each year. In an attempt to change this scenario WHO has stimulated regular practice of physical activities, because they play an important role in preventing CNCDs. In Brazil, these activities are performed by health units which generate a large amount of data that need treatment. To deal with this problem we developed UCEMEPA, an environment that employs Ubiquitous Computing technologies and wireless communication networks, in order to monitor remotely and evaluate participants of physical activity groups in real-time. This environment automatically collects physiologic data, and provides indicators which will support and direct public policies for promoting physical activity. In this sense, UCEMEPA will contribute for the promotion of health and quality of life, and for the conduction of longitudinal studies aiming to establish correlations between the practice of physical activity and CNCDs prevention.
A pedagogização do sexo da criança: do corpo ao dispositivo da infância
(Universidade Federal de São Carlos, 2012-06-13) Moruzzi, Andrea Braga; Abramowicz, Anete; https://lattes.cnpq.br/1502374705668286
Cette recherche tente de relever et d analyser les différentes pratiques qui produisirent l enfance moderne. Nous sommes partis de la notion que le XVIIIème Siècle investit de façon spécifique au niveau du corps de l enfant, en produisant une série de pratiques qui s inscrivent dans un processus de pédagogisation de son sexe. Cette pédagogisation, de son côté, se déroule dans un premier temps, au travers d un silence et d une négation de l existence de la sexualité de l enfant, mais dans un deuxième temps, déclenche une explosion de pratiques qui iront, par ailleurs, exalter, expliquer, inciter, « libérer », traiter, soigner, etc., toutes ses manifestations autour de son corps. Notre hypothèse est que, à partir du moment où l enfant devient un des groupes stratégiques du dispositif de la sexualité, un ensemble hétérogène de régimes de vérités et pratiques se produit sur lui, de sorte que s installe chez cet enfant une façon d être et d avoir une enfance. Ainsi, la présente recherche a investi dans l idée que l enfance est à l image de la sexualité, un dispositif du pouvoir. Nous présentons trois groupes de pratiques que nous appelons ici Pratiques pédagogiques, Pratiques divisantes et identitaires de genre et de sexualité et Pratiques médicales. À partir de certaines caractéristiques attribuées au concept de dispositif, nous avons tenté d élucider au sein de ces pratiques les lignes de visibilité et d énonciation, celles de force et celles de subjectivation qui convergent dans le dispositif de l enfance. Nous observons que les pratiques qui engendrèrent l enfance moderne s inscrivent dans un mouvement qui va de l analyse minutieuse du corps à la configuration d une manière de vivre, de se comporter, de se vêtir, d habiter, de s exprimer, qui configure chez les enfants une façon de vivre l enfance.