Influência das espécies do plasma de N2 + O2 nas propriedades físicoquímicas das superfícies do pet

This work reports the influence of the poly (ethylene terephthalate) textile and films surface modification by plasmas of O2 and mixtures (N2 + O2), on their physical and chemical properties. The plasma surface polymeric modification has been used for many researchs, because it does not affect the environment with toxic agents, the alterations remains only at nanometric layers and this technique shows expressive results. Then, due to its good acceptance, the treatment was carried out in a vacuum chamber. Some parameters remained constant during all treatment, such as: Voltage 470 V; Pressure 1,250 Mbar; Current: 0, 10 A and gas flow: 10 cm3/min, using oxygen plasma alternating the treatment time 10 to 60 min with an increase of 10 min to each subsequent treatment. Also, the samples were treated with a gas mixture (nitrogen + oxygen) which was varied only the gas composition from 0 to 100% leaving the treatment time remaining constant to all treatment (10 min). The plasma treatment was characterized in-situ with Optics Emission Spectroscopy (OES), and the samples was characterized by contact angle, surface tension, Through Capillary tests, Raman spectroscopy, Infrared attenuated total reflection (IR-ATR) and atomic force microscopy, scanning electronic Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The results showed that oxygen treated fabrics presented high wettability, due to the hydrophilic groups incorporation onto the surface formed through spputering of carbon atoms. For the nitrogen atmosphere, there is the a film deposition of amine groups. Treatment with small oxygen concentration in the mixture with nitrogen has a higher spputered species of the samples

Estudo da viabilidade técnica para obtenção de superfície duplex em aço inoxidável martensítico AISI 410 através do processo de deposição a plasma por gaiola catódica

The technique of plasma nitriding by the cathode cage mainly stands out for its ability to produce uniform layers, even on parts with complex geometries. In this study, it was investigated the efficiency of this technique for obtaining duplex surface, when used, simultaneously, to nitriding treatment and thin film deposition at temperatures below 500°C. For this, were used samples of AISI 41 0 Martensitic Stainless Steel and performed plasma treatment, combining nitriding and deposition of thin films of Ti and/or TiN in a plasma atmosphere containing N2-H2. It was used a cathodic cage of titanium pure grade II, cylindrical with 70 mm diameter and 34 mm height. Samples were treated at temperature 420ºC for 2 and 12 hours in different working pressures. Optical Microscopy (OM), Scanning Electron Microscopy (SEM) with micro-analysis by Energy Dispersive Spectroscopy (EDS), X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM) and analysis of Vickers Microhardness were used to investigate coating properties such as homogeneity and surface topography, chemical composition, layer thickness, crystalline phase, roughness and surface microhardness. The results showed there is a direct proportionality between the presence of H2 in plasma atmosphere and the quantity of titanium in surface chemical composition. It was also observed that the plasma treatment at lowpressure is more effective in formation of TiN thin film

Processamento e caracterização de compósitos Poli(METACRILATO DE METILA)/Sílica (PMMA/SiO2)

Currently the search for new materials with properties suitable for specific applications has increased the number of researches that aim to address market needs. The poly (methyl methacrylate) (PMMA) is one of the most important polymers of the family of polyacrylates and polymethacrylates, especially for its unique optical properties and weathering resistance, and exceptional hardness and gloss. The development of polymer composites by the addition of inorganic fillers to the PMMA matrix increases the potential use of this polymer in various fields of application. The most commonly used inorganic fillers are particles of silica (SiO2), modified clays, graphite and carbon nanotubes. The main objective of this work is the development of PMMA/SiO2 composites at different concentrations of SiO2, for new applications as engineering plastics. The composites were produced by extrusion of tubular film, and obtained via solution for application to commercial PMMA plates, and also by injection molding, for improved the abrasion and scratch resistance of PMMA without compromising transparency. The effects of the addition of silica particles in the polymer matrix properties were evaluated by the maximum tensile strength, hardness, abrasion and scratch resistance, in addition to preliminary characterization by torque rheometry and melt flow rate. The results indicated that it is possible to use silica particles in a PMMA matrix, and a higher silica concentration produced an increase of the abrasion and scratch resistance, hardness, and reduced tensile strength

Desenvolvimento e avaliação de um sistema de cálculo de dose independente para controle de qualidade de IMRT do tipo jaws-only

Dissertação (mestrado)—Universidade de Brasília, Faculdade Gama, Programa de Pós-Graduação em Engenharia Biomédica, 2015.

Marketing de cinema : a supply chain do sector cinematografico português

Mestrado em Marketing

"A Devota e a Devassa", uma novela de Fernando Pessanha

Há um ano e meio escrevi neste jornal sobre Hotel Anaidaug, narrativa fantástica de Fernando Pessanha, que brevemente (assim o espero) poderemos ver em filme. Hoje, este prolífero autor proporcionou-me a oportunidade de escrever sobre a sua mais recente novela, A Devota e a Devassa, da qual já tive o privilégio de redigir o prefácio.

Novos sentidos da leitura: a contribuição do cinema para a leitura do texto narrativo

Mestrado em Literatura Comparada, Faculdade de Ciências Humanas e Sociais, Departamento de Letras Clássicas e Modernas, Univ. do Algarve, 2004

Construção de um aparato experimental para monitoramento in situ da deposição de filmes finos de titânio por magnetron sputtering

The technique of surface coating using magnetron sputtering is one of the most widely used in the surface engineering, for its versatility in obtaining different films as well as in the micro / nanometric thickness control. Among the various process parameters, those related to the active species of the plasma are of the most fundamental importance in the mechanism and kinetics of deposition. In order to identify the active species of the plasma, parameters such as gas flow, pressure and density of electric power were varied during titanium coating on glass substrate. By flowing argon gas of 10, 20, 30, 40 and 50 sccm (cubic centimeters per minute) for each gas flow a sequential scan of the electric current of 0.10, 0.20, 0.30, 0.40 , 0.50 A. The maximum value of 0.50 A was chosen based both on literature data and on limitations of the equipment. The monitoring of plasma species present during the deposition was carried out in situ by the technique of optical emission spectroscopy (OES) through the spectrometer Ocean Optics USB2000 Series. For this purpose, an apparatus was developed to adapt the OES inside the plasma reactor to stay positioned closest to the target. The radiations emitted by the species were detected by an optical fiber placed behind the glass substrate and their intensities as a function of wavelength were, displayed on a monitor screen. The acquisition time for each condition of the plain parameters was related to the minima of spectral lines intensities due to the film formed on the substrate. The intensities of different emission lines of argon and titanium were then analyzed as a function of time, to determine the active species and estimate the thickness of the deposited films. After the deposition, the coated glasses thin films were characterized by optical transmittance through an infrared laser. It was found that the thickness and deposition rate determined by in situ analysis were consistent with the results obtained by laser transmittance

Análisis de las traducciones de Érase una vez... el hombre al español

La tesis doctoral «Análisis de las traducciones de Érase una vez… el hombre al español» es un estudio descriptivo elaborado a partir de la traducción de la serie televisiva para niños de finales de los años setenta. La investigación versa sobre el análisis de las dos traducciones comercializadas en España: la versión en español de España emitida por la cadena pública Televisión Española y la versión en español de América, distribuida años después por una conocida editorial privada. La tesis busca describir las tendencias de traducción de tales productos mediante el estudio de técnicas y normas de traducción incorporando las aportaciones de la traducción de la literatura para niños desde la combinación lingüística francés-español. La tesis abordará el análisis desde una adaptación de la propuesta de Lambert y Van Gorp (1985) para describir un primer nivel de información preliminar, donde se llevará a cabo la investigación del contexto de la serie; un segundo nivel macrotextual, donde se estudiarán los códigos de significación del filme que son susceptibles de ser traducidos; y un último nivel microtextual, en el que se realizará un análisis de los dos pares de lengua (español de España – francés; español de América – francés) desde las técnicas de traducción y desde las normas y posibles normas. Por último, el análisis de resultados obtenidos permitirá relacionar los distintos niveles abordados así como detectar una serie de semejanzas en la transferencia de la serie televisiva con las normas descritas en traducción de la literatura infantil y juvenil.

Sociocrítica y fenómenos de transexualidad

Se aborda un caso de variación transexual en textos escritos y audiovisuales. 

O cinema como recurso pedagógico na aula de história

Este estudo pretendeu pesquisar acerca da influência do cinema histórico de ficção na construção do conhecimento histórico de alunos de História A do Ensino Secundário. Foi realizado com uma turma do 10º ano de escolaridade de 20 alunos e foi antecedido de um estudo prévio. O trabalho baseou-se no visionamento do filme "O Gladiador" e na realização de fichas de trabalho: a "Ficha de Enquadramento Histórico do Filme", para contextualizar a época histórica em que decorria o filme; a "Ficha de Análise do Filme”, para recolha de dados e finalmente a "Ficha de Trabalho de Comparação entre Fontes Históricas e o Filme". As respostas fornecidas pelos alunos foram organizadas em categorias. Para as perguntas que pediam uma resposta mais directa e simples foram criadas três categorias: básica primária, básica secundária e definição elaborada. Para as perguntas que exigiam uma resposta mais complexa criaram-se cinco categorias: incoerente, básica primária, básica secundária, definição emergente e definição elaborada. As principais conclusões foram: a) o cinema de ficção desempenha um importante contributo na construção do conhecimento histórico dos alunos do ensino secundário; b) o visionamento de filmes de ficção na aula de História deve ser acompanhado com o confronto de fontes históricas para os alunos distinguirem ficção de conhecimento histórico; c) o cinema desempenha um papel muito importante no desenvolvimento das competências específicas de História do Ensino Secundário e do espírito crítico dos alunos; entre outras. / ABSTRACT: This study aimed to understand the influence of historical fiction movies in historical knowledge of students in History of Secondary Education. The study was conducted with a group of 20 students of the 1O th grade and was preceded by a preliminary study. The work was based on viewing the film Gladiator and on worksheets: A "Historical Background" to contextualize the historical era of the movie, the "The analysis of the Movie" to collect data and finally the “Comparison of Historical Sources and movie” worksheet to analyze distinguish fiction from historical knowledge. The responses given by students were categorized: for questions that asked for a more direct and simple answer were created three categories: Basic; Primary; Definition elaborated. For questions requiring a more complex answer were created five categories Incoherent; Basic; Primary; Emergent and Elaborated. The main conclusions were: a) the film fiction has an important contribution to historical knowledge of secondary school students, b) using films in history lessons should be accompanied with a comparison of historical sources for students to distinguish fiction from historical knowledge, c) the film plays an important role in the development of specific skills for the History of Secondary Education and the students' critical thinking, among others.

Pastas compósitas cimento/sílica/polímero para cimentação de poços de baixa profundidade sujeitas à injeção de vapor

The production of heavy oil fields, typical in the Northeastern region, is commonly stimulated by steam injection. High bottom hole temperatures are responsible not only for the development of deleterious stresses of the cement sheath but also for cement strength retrogression. To overcome this unfavorable scenario, polymeric admixtures can be added to cement slurries to improve its fracture energy and silica flour to prevent strength retrogression. Therefore, the objective of the present study was to investigate the effect of the addition of different concentrations of polyurethane (5-25%) to cement slurries containing 40% BWOC silica flour. The resulting slurries were characterized using standard API (American Petroleum Institute) laboratory tests. In addition to them, the mechanical properties of the slurries, including elastic modulus and microhardness were also evaluated. The results revealed that density, free water and stability of the composite cement/silica/polyurethane slurries were within acceptable limits. The rheological behavior of the slurries, including plastic viscosity, yield strength and gel strength increased with the addition of 10% BWOC polyurethane. The presence of polyurethane reduced the fluid loss of the slurries as well as their elastic modulus. Composite slurries also depicted longer setting times due to the presence of the polymer. As expected, both the mechanical strength and microhardness of the slurries decreased with the addition of polyurethane. However, at high bottom hole temperatures, the strength of the slurries containing silica and polyurethane was far superior than that of plain cement slurries. In summary, the use of polyurethane combined with silica is an interesting solution to better adequate the mechanical behavior of cement slurries to heavy oil fields subjected to steam injection

O Sangyo em Dolls: um encontro do Bunraku com Takeshi Kitano

This work aims to investigate the relationship between the Bunraku theater and the film Dolls (2002), by the Japanese director Takeshi Kitano. To do so, it was initially done a theoretical study of this theater, detailing its key elements, and thus allowing a direct analysis of the film to be made. The main objective here was to reveal the film‟s connections with the Bunraku. The Sangyo refers to the simultaneous presence of three arts in the Bunraku theater: the narrative, the music and the manipulation of puppets. In Dolls, the director Takeshi Kitano presents a narrative through three different stories, all built with references to the Bunraku. As in the theater the three distinct arts harmonize on stage, in Dolls three separate stories will perform in harmony within the film. By confronting the Bunraku Theater with the film Dolls, the intention is to establish the connections between the scenic language of the Bunraku, the dramaturgy of Chikamatsu and also the cinema of Kitano. These connections allow to the understanding of how characteristics of a secular art, governed by strong rules and conventions, can be presented again through another language: the cinematic language and its particular set of codes and conventions

Efeito antibacteriano de tecidos têxteis revestidos por prata através da técnica de deposição por plasma

In this study, it has been investigated the influence of silver film deposition onto 100% polyester woven and non-woven, on the survival of Escherichia coli and Staphylococcus aureus in contact with these surfaces. The treatment was performedin a chamber containing the working gas at low pressure (~ 10-2 mbar). Some process parameters such as as voltage: 470 V; pressure: 10-2 mbar; current : 0.40 A and gas flow: 6 and 10 cm3/min were kept constant. For the treatments with purêargon plasma using a flow of 6 and 10 cm3/min, different treatment times were evaluated, such as, 10 , 20, 30, 40, 50 and 60 minutes. Contact angle (sessile drop), measurements were used to determine the surface tension of the treated fabrics and its influence on the bacteria grow as weel as the possibilities of a biofilm formation. The formation of a silver film, as well as the amount of this element was verified byEDX technique. The topography was observed through scanning electron microscopy (SEM) to determine the size of silver grains formed on the surfaces of the fabric and assess homogeneity of treatment. The X-ray diffraction (XRD) was used to analyze the structure of silver film deposition. The woven fabric treatments enabled the formation of silver particulate films with particle size larger than the non-woven fabrics. With respect to bacterial growth, all fabrics were shown to be bactericidal for Staphylococcus aureus (S. aureus), while for the Escherichia coli (E. coli), the best results were found for the non-woven fabric (TNT) treated with a flow of 10 cm3/min to both bacteria

Filmes formados pelo copolímero SEBS e nanopartículas de óxidos de ferro : preparação e caracterização

Dissertação (mestrado)—Universidade de Brasília, Instituto de Física, Programa de Pós-Graduação em Física, 2016.