Influência da participação social na conservação da biodiversidade em unidades de conservação brasileiras

Tese (doutorado)—Universidade de Brasília, Centro de Desenvolvimento Sustentável, 2016.

Estudo da adição de argila expandida na formulação de concretos leves

Lightweight concrete has been the subject of several studies towards the development of new building materials. Emphasis has been given on the particle size effect and nature of aggregates used as raw materials. The present study includes an analysis of the materials that make this kind of concrete, analyzes of mechanical properties such as compressive and tensile strength, in addition to assessments of the interface concrete aggregate/matrix interface, porosity and absorption profile of chloride ions in lightweight concrete based on expanded clay. The experiments were carried out by molding cylindrical samples 100 mm in diameter and 200 mm in height. The dosage experiments were performed without additives or with the addition of minerals: (T1) 1: 2.01: 1.10: 0.78 (T2) 1: 2.00: 1.32 : 0.62 - (T3) 1 :1.93 :1.54: 0.47 (cement : sand : expanded clay 0500 : expanded clay 1506).The water to cement ratio was set to 0.43. Expanded clay minerals with different average particle sizes were used, i.e., 9.5 mm/0500 and 19 mm/1506. The larger aggregate was coated by a glassy layer, yielding lower water absorption characteristics to the concrete. The results showed that the use of light expanded clay aggregates is a technically interesting solution to the production of lightweight concrete for construction applications

Variáveis subjacentes à escolha do mestrado na área de Gestão na Universidade Europeia

O ensino superior é um mercado em crescente competitividade devido a uma maior concorrência. No sentido de ganhar vantagem, cada Instituição de Ensino Superior (IES), deve identificar quais as variáveis fundamentais que influenciam, a captação e a fidelização de alunos. Cada IES, ao identificar as variáveis mais relevantes e valorizadas pelos estudantes que frequentam as diversas formações, poderá posteriormente desenvolver uma estratégia eficiente para cada formação. Em suma, convém que as Instituições de Ensino Superior definam estratégias que englobem todas as variáveis e que essas estratégias sejam focadas em compreender as expetativas e necessidades dos estudantes. Este estudo foca-se nas expetativas e motivações dos alunos e ex-alunos do Mestrado na área de Gestão e Estratégia Empresarial na Universidade Europeia (UE), aquando da sua escolha em frequentar esta formação.

Aproveitamento de resíduos minerais na formulação de argamassas para a construção civil

Current environmental concerns include the excessive consumption and inefficient use of non-renewable natural resources. The construction industry is considered one of the largest consumers of natural raw materials, significantly contributing to the environmental degradation of the planet. The use of calcareous quarry (RPPC) and porcelain tile polishing residues (RPP) as partial replacements of the cement in mortars is an interesting alternative to minimize the exploration of considerably large amounts of natural resources. The present study aimed at investigating the properties of fresh and hardened mortars produced using residues to replace cement. The residues used were fully characterized to determine their specific mass, unitary mass, particle size distribution and morphology, and composition. The performance of the mortars was compared to that of reference compositions, prepared without residues. A total of 18 compositions were prepared, 16 using residues and 2 reference ones. The mortars were prepared using Portland CP II F 32 cement, CH I hydrated lime, river sand and tap water. The compositions of the mortars were 1:1:6 and 1:0.5:4.5 (vol%), and water to cement ratios of 1.87 and 1.45 were used, respectively. The mortars in the fresh state were evaluated by consistency index, water retention, density of mass and incorporated air content tests. In their hardened state, the mortars were evaluated by apparent mass density, modulus of elasticity, flexural tensile strength, compressive strength and water absorption by capillarity. The mortars were also analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and fluorescence. Finally, they were classified according to NBR 13281 standards. The mortars prepared using residues partially replacing the cement exhibited lower modulus of elasticity compared to the reference compositions, thus improving the performance in their intended use. On the downside, the water absorption by capillarity was affected by the presence of residues and both the tensile and compressive strength were reduced. However, from the overall standpoint, the replacement of cement by calcareous quarry or porcelain tile polishing residues did not result in significant changes in the properties of the mortars. Therefore, compositions containing these residues can be used in the construction industry

Formulação de pastas cimentícias com adição de suspensões de quitosana para cimentação de poços de petróleo

Primary cementing is one of the main operations in well drilling responsible for the mechanical stability and zonal isolation during the production of oil. However, the cement sheath is constantly under mechanical stresses and temperature variations caused by the recovery of heavy oil. In order to minimize fracture and wear of the cement sheath, new admixtures are developed to improve the properties of Portland cement slurries and avoid environmental contamination caused by leaking gas and oil. Polymers with the ability to form polymeric films are candidates to improve the properties of hardened cement slurries, especially their fracture energy. The present study aimed at evaluating the effect of the addition of a chitosan suspension on cement slurries in order to improve the properties of the cement and increase its performance on heavy oil recovery. Chitosan was dissolved in acetic ac id (0.25 M and 2 M) and added to the formulation of the slurries in different concentrations. SEM analyses confirmed the formation of polymeric films in the cementitious matrix. Strength tests showed higher fracture energy compared to slurries without the addition of chitosan. The formation of the polymeric films also reduced the permeability of the slurry. Therefore, chitosan suspensions can be potentially used as cementing admixtures for heavy oil well applications

Formulação de grautes leves para a cimentação de poços de petróleo onshore

Grautes are dry mixes with hydraulic characteristics widely used in construction. This material comprises cement, mineral additives and dosed in accordance with the desired properties. The use of grautes in cementing oil wells potentially increases the precision in the composition of the mixture, since it is requires only the addition of the mixing water before its pumping. Such benefit may be availed in cementing wells since the formulations grautes meet the temperature and pressure characteristics typical of wells. The objective of this study is to evaluate the effect of adding different percentages of industrial minerals properties of light grautes for onshore oil wells. For the formulation of the employees were grautes light industrial minerals and waste minerals abundant in the Northeast, in addiction to Portland cement and chemical additives Special class. Grautes were formulated with densities between 1.55 g/cm3 (13.0 lb/gal) and 1.68 g/cm3 (14 lb/gal). Tests results showed that grautes with higher density in the range studied meet the specifications for cementation of shallow wells onshore. The compositions lighter can also be adjusted for applying the material in the cementation of oil wells

Efeito da adição de carbonatos em formulação de massa para revestimento cerâmico utilizando matérias-primas do Piauí

Piauí state is a major producer of traditional red ceramic burning as bricks, tiles and ceramic tiles, with its main production center located in the city of Teresina. The state has large reserves of raw materials that can be used in the ceramic coating as clays, quartz, talc and carbonates. However, in the preparation of ceramic bodies using only a mixture of clays with different characteristics. The study aims to evaluate the effect of adding two types of carbonates in the ceramic semiporous mass coating produced in Piauí and then to verify the potential use of these carbonates as supplementary raw material product manufactured or the feasibility of obtaining a ceramic plate that meets the specifications for the porous coating. For this, were characterized the ceramic Piauí coating mass, a calcitic carbonate and a dolomitic, were made in the levels of 2, 4, 8, 16, and 32%. The masses were formed by pressing and burneds in two environments: a laboratory furnace (1080°C, 1120°C, 1140°C, and 1160°C) and an industrial furnace (1140°C). Then, following tests of linear shrinkage water absorption, apparent porosity, bulk density and flexural strength. Furthermore, the fired specimens were tested for their macrostructure and microstructure. The results showed the possibility of using the carbonate in ceramic mass flooring produced in Piauí, as added in small proportions improved dimensional stability and increased mechanical strength of ceramics pieces. It also proved itself possible to produce porous coating when added in higher levels

Compromisso, motivação e identidade atlética como variáveis preditivas do consumo de desporto

O objetivo deste estudo foi examinar a relação entre a motivação, o compromisso desportivo e a identidade atlética e três tipos de comportamentos de consumo de desporto: frequência de participação, consumo de artigos de desporto e consumo de media. Foi aplicado um questionário a praticantes de desportos individuais e coletivos, de fitness e de prática informal (n = 900). O questionário incluíu questões relacionadas com informações sociodemográficas, com a motivação, o compromisso desportivo, a identidade atlética e com o comportamento de consumo de desporto. Para analisar os dados utilizámos modelos de equações estruturais, testes de comparação (ANOVA). Os resultados mais relevantes foram os obtidos a partir de um modelo de equações estruturais onde foram fornecidas evidências de que o compromisso desportivo tem uma influência positiva sobre a frequência de participação, sobre o consumo de artigos de desporto e dos media. Também a motivação e a identidade atlética tem uma influência sobre os diferentes tipos de consumo de desporto, estudados nesta investigação. As implicações destes resultados são discutidas e sugestões para futuras pesquisas sobre praticantes de desporto são fornecidas.

Efeito das variáveis laboratoriais protéticas na adesão da porcelana com ligas de níquel-cromo

The metalceramic crowns are usually used in dentistry because they provide a resistant structure due to its metallic base and its aesthetics from the porcelain that recovers this structure. To manufacture these crowns, a series of stages should be accomplished in the prosthetic laboratories, and many variables can influence its success. Changes in these variables cause alterations in the metallic alloy and in the porcelain, so, as consequence, in the adhesion between them. The composition of the metal alloy can be modified by recasting alloys, a common practice in some prosthetic laboratories. The aim of this paper is to make a systematic study investigating metalceramic crowns as well as analyzing the effect of recasting Ni-Cr alloys. Another variable which can influence the mechanism of metalceramic union is the temperature used in firing porcelain procedure. Each porcelain has to be fired in a fixed temperature which is determined by the manufacturer and its change can cause serious damages. This research simulate situations that may occur on laboratory procedures and observe their consequences in the quality of the metalceramic union. A scanning eletron microscopy and an optic microscopy were accomplish to analyse the metal-ceramic interface. No differences have been found when remelting alloys were used. The microhardness were similar in Ni-Cr alloys casted once, twice and three times. A wettability test was accomplished using a software developed at the Laboratório de Processamento de Materiais por Plasma, on the Universidade Federal do Rio Grande do Norte. No differences were found in the contact angle between the solid surface (metallic substratum) and the tangencial plane to the liquid surface (opaque). To analyse if the temperature of porcelain firing procedure could influence the contact area between metal and porcelain, a variation in its final temperature was achieve from 980° to 955°C. Once more, no differences have been found

Etapas do desenvolvimento de uma formulação pó molhável para o Baculovirus anticarsia: secagem e caracterização da superfície do poliedro.

As primeiras etapas selecionadas para o estudo de uma formulação pó molhável foram a caracterização de superfície quanto a morfologia (MEV) e carga, e a influencia do método de secagem na dispersibilidade das partículas. O vírus foi obtido de lagartas infectadas (CNPSo) e purificado pelo método de Van der Geest. A dispersão resultante apresenta uma distribuição de tamanho entre 1.6 e 1.9 micra, permanecendo invariável quando a preparação foi armazenada ate 6 meses sob refrigeração. O ponto isoelétrico dos poliedros de NPV de B. anticarsia, determinado a partir de gráfico de mobilidade versus pH e 4,5, sendo que em pHs superiores, as partículas estão carregadas negativamente. As dispersões foram secas por liofilização, spray dryer e estufa (27 C.). O processo de secagem determina o estado de agregação, quando os poliedros são dispersos novamente em água, com tamanho ate 27 micra, difíceis de redispersar, enquanto a secagem por spray dryer resulta em um material pouco aglomerado e facilmente dispersível.

Transição para a vida adulta no contexto da deficiência : estudo das variáveis pessoais e sociais associadas a um processo de sucesso e desenvolvimento de um modelo de intervenção inclusivo

A transição da adolescência para a idade adulta é uma fase crucial do desenvolvimento de qualquer jovem, na qual são colocados vários desafios em relação ao seu futuro. Os adolescentes com deficiência enfrentam desafios adicionais: quando comparados com os seus pares, têm mais dificuldades em encontrar um percurso de vida adulta, por exemplo no emprego ou no prosseguimento de estudos. Por outro lado, a baixa participação social é um dos fatores que mais afeta a qualidade de vida. Percebendo-se que o processo de transição é multifacetado, as seis investigações apresentadas neste trabalho colocam o enfoque no próprio indivíduo, mas também em contextos importantes para a transição como a família, através da seguinte sequência de estudos: (1) dois estudos preliminares que caracterizam adolescentes e jovens com deficiência no que se refere a comportamentos ligados à saúde, estilos de vida e respetivas interacções com a satisfação com a vida; (2) dois estudos qualitativos que confirmam a problemática da transição e aferem os fatores críticos envolvidos, através das percepções de pais e jovens; e (3) dois estudos que fazem a análise do comportamento destes factores numa amostra de adolescentes e jovens com deficiência. Os resultados revelam um padrão de saúde e sintomático mais negativo nos jovens com deficiência quando comparados com os seus pares, e salientam a importância da relação com os outros significativos, em especial os pais. Os vários estudos mostram ainda que os contextos de vida devem proporcionar suportes adequados e atempados à transição e apelam para a importância do desenvolvimento de aptidões críticas, tais como a promoção de competências de autodeterminação, autoeficácia, e promoção da resiliência. Os resultados dos estudos são discutidos de forma integrada. São também feitas recomendações futuras desde a perspectiva individual até à das políticas e planeamento. Finalmente, é proposto um modelo do planeamento e desenvolvimento da transição que pretende ser orientador para todos os atores envolvidos no processo.

Défices cognitivos em pacientes com depressão unipolar: Influência das variáveis idade, género e história anterior de tentativas de suicídio

Tese de Doutoramento, Psicologia, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2015

Formulação do quadro estratégico e plano de marketing da Fundação Rebikoff-Niggeler

Mestrado em Marketing

Impacto de variáveis sócio-culturais no desempenho cognitivo: estudo em crianças dos 4 aos 7 anos

Dissertação de mest. em Psicologia da Educação - Especialização em Ensino Básico, Faculdade de Ciências Humanas e Sociais e Escola Superior de Educação, Univ. do Algarve, 2003

Qualificação de edifícios residenciais verticais em Natal/RN à luz do regulamento técnico da qualidade para o nível de eficiência energética de edificações residenciais (RTQ-R)

The goal of the research was to investigate the energy performance of residential vertical buildings envelope in the hot and humid climate of Natal, capital of Rio Grande do Norte, based in the Technical Regulation of Quality for Energy Efficiency Level in Residential Buildings (RTQ -R), launched in 2010. The study pretends to contribute to the development of design strategies appropriate to the specific local climate and the increasing of energy efficiency level of the envelope. The methodological procedures included the survey in 22 (twenty two) residential buildings, the formulation of representative prototypes based on typological and constructives characters researched and the classification of the level of energy efficiency in the envelopment of these prototypes, using as a tool the prescriptive method of the RTQ-R and the parametric analyzes from assigning different values of the following variables: shape of the pavement type; distribution of housing compartments; orientation of the building; area and shading of openings; thermal transmittance, and solar absorptance of opaque materials of the frontage in order to evaluate the influence of these on the envelopment performance. The main results accomplished with this work includes the qualification of vertical residential buildings in Natal/RN; the verification of the adequacy of these buildings to local climate based from the diagnosis of the thermal energy of the envelopment performance, the identification of variables with more significant influence on the prescriptive methodology of RTQ-R and design solutions more favorable to obtain higher levels energy efficiency by this method. Finally, it was verified, that some of these solutions proved contradictory in relation to the recommendations contained in the theoretical approaches regarding environmental comfort in hot and humid weather, which indicates the need for improvement of the prescriptive method RTQ-R and further research on efficient design solutions