Implementação da rotina de unfolding para determinação de distribuição de tamanho de grãos esféricos via distribuição de interceptos lineares e de área de seção

Na unfolding method of linear intercept distributions and secction área distribution was implemented for structures with spherical grains. Although the unfolding routine depends on the grain shape, structures with spheroidal grains can also be treated by this routine. Grains of non-spheroidal shape can be treated only as approximation. A software was developed with two parts. The first part calculates the probability matrix. The second part uses this matrix and minimizes the chi-square. The results are presented with any number of size classes as required. The probability matrix was determined by means of the linear intercept and section area distributions created by computer simulation. Using curve fittings the probability matrix for spheres of any sizes could be determined. Two kinds of tests were carried out to prove the efficiency of the Technique. The theoretical tests represent ideal cases. The software was able to exactly find the proposed grain size distribution. In the second test, a structure was simulated in computer and images of its slices were used to produce the corresponding linear intercept the section area distributions. These distributions were then unfolded. This test simulates better reality. The results show deviations from the real size distribution. This deviations are caused by statistic fluctuation. The unfolding of the linear intercept distribution works perfectly, but the unfolding of section area distribution does not work due to a failure in the chi-square minimization. The minimization method uses a matrix inversion routine. The matrix generated by this procedure cannot be inverted. Other minimization method must be used

Estudo de efeitos da frequência de uma iniciativa de educação ambiental, no nível de preocupação ambiental, numa amostra da população de Macapá – Amapá – Brasil.

Dissertação de Mestrado apresentada ao Instituto Superior de Psicologia Aplicada para obtenção de grau de Mestre na especialidade de Psicologia Educacional.

A influência do conselho de administração na lucratividade das empresas listadas na BM&FBOVESPA

Dissertação (mestrado)—UnB/UFPB/UFRN, Programa MultiInstitucional e Inter-Regional de Pós-Graduação em Ciências Contábeis, 2016.

Sinterização de aço inoxidável reforçado com partículas nanométricas dispersas de carbeto de nióbio - NbC

Metal powder sintering appears to be promising option to achieve new physical and mechanical properties combining raw material with new processing improvements. It interest over many years and continue to gain wide industrial application. Stainless steel is a widely accepted material because high corrosion resistance. However stainless steels have poor sinterability and poor wear resistance due to their low hardness. Metal matrix composite (MMC) combining soft metallic matrix reinforced with carbides or oxides has attracted considerable attention for researchers to improve density and hardness in the bulk material. This thesis focuses on processing 316L stainless steel by addition of 3% wt niobium carbide to control grain growth and improve densification and hardness. The starting powder were water atomized stainless steel manufactured for Höganäs (D 50 = 95.0 μm) and NbC produced in the UFRN and supplied by Aesar Alpha Johnson Matthey Company with medium crystallite size 16.39 nm and 80.35 nm respectively. Samples with addition up to 3% of each NbC were mixed and mechanically milled by 3 routes. The route1 (R1) milled in planetary by 2 hours. The routes 2 (R2) and 3 (R3) milled in a conventional mill by 24 and 48 hours. Each milled samples and pure sample were cold compacted uniaxially in a cylindrical steel die (Ø 5 .0 mm) at 700 MPa, carried out in a vacuum furnace, heated at 1290°C, heating rate 20°C stand by 30 and 60 minutes. The samples containing NbC present higher densities and hardness than those without reinforcement. The results show that nanosized NbC particles precipitate on grain boundary. Thus, promote densification eliminating pores, control grain growth and increase the hardness values

Tangibilidade, classe de ativos e estrutura de capital das empresas listadas na BM&FBOVESPA

This study aims to investigate the influence of the asset class and the breakdown of tangibility as determinant factors of the capital structure of companies listed on the BM & FBOVESPA in the period of 2008-2012. Two current assets classes were composed and once they were grouped by liquidity, they were also analyzed by the financial institutions for credit granting: current resources (Cash, Bank and Financial Applications) and operations with duplicates (Stocks and Receivables). The breakdown of the tangible assets was made based on its main components provided as warrantees for loans like Machinery & Equipment and Land & Buildings. For an analysis extension, three metrics for leverage (accounting, financial and market) were applied and the sample was divided into economic sectors, adopted by BM&FBOVESPA. The data model in dynamic panel estimated by a systemic GMM of two levels was used in this study due its strength to problems of endogenous relationship as well as the omitted variables bias. The found results suggest that current resources are determinants of the capital structure possibly because they re characterized as proxies for financial solvency, being its relationship with debt positive. The sectorial analysis confirmed the results for current resources. The tangibility of assets has inverse proportional relationship with the leverage. As it is disintegrated in its main components, the significant and negative influence of machinery & equipment was more marked in the Industrial Goods sector. This result shows that, on average, the most specific assets from operating activities of a company compete for a less use of third party resources. As complementary results, it was observed that the leverage has persistence, which is linked with the static trade-off theory. Specifically for financial leverage, it was observed that the persistence is relevant when it is controlled for the lagged current assets classes variables. The proxy variable for growth opportunities, measured by the Market -to -Book, has the sign of its contradictory coefficient. The company size has a positive relationship with debt, in favor of static trade-off theory. Profitability is the most consistent variable in all the performed estimations, showing strong negative and significant relationship with leverage, as the pecking order theory predicts

Estimativas de estádios ninfais de Psilídeo-de-concha (Glycaspis brimblecombei) em função do tamanho das conchas.

O psilídeo-de-concha, Glycaspis brimblecombei, é considerado praga uarentenária A2 no Brasil que, pela preferência a Eucaliptus camaldulensis - espécie de elevada importância econômica - tem acarretado grande preocupação ao setor florestal nacional. A insuficiência de métodos químicos aceitáveis, pelas empresas certificadas internacionalmente, para o controle da praga vem tornando a estratégia de controle biológico pelo parasitóide Psyllaephagus bliteus a opção mais apropriada. Por esta razão a disponibilidade de métodos que ajudem a diferenciar estas fases é de grande importância tanto para a identificação precisa do seu ciclo de vida quanto para a proposição de estratégias de seu controle biológico. O objetivo do presente trabalho foi identificar os estádios ninfais de G. brimblecombei, estabelecer um padrão de tamanho para as mesmas e para suas respectivas conchas e, a partir deste, propor um método inédito para estimar estádios ninfais de desenvolvimento em função dos tamanhos de conchas amostradas. O método fez uso de minucioso trabalho de observação de conchas de diferentes tamanhos em lupa, identificando os estádios e tamanhos das ninfas presente em seu interior, o diâmetro das conchas por elas formadas, bem análises estatísticas e de tendências. Os resultados indicaram: Ninfa 1 - de 0,4 mm a 0,9 mm; Ninfa 2 - de 0,8mm a 1,2 mm; Ninfa 3 - de 1,2 mm a 1,6 mm; Ninfa 4 - de 1,7 mm a 2,2 mm;e Ninfa 5 - de 2,0 mm a 3,0 mm.

Influência dos parâmetros de processo na deposição de nitreto de titânio por plasma em gaiola catódica

Titanium nitride films were grown on glass using the Cathodic Cage Plasma Deposition technique in order to verify the influence of process parameters in optical and structural properties of the films. The plasma atmosphere used was a mixture of Ar, N2 and H2, setting the Ar and N2 gas flows at 4 and 3 sccm, respectively and H2 gas flow varied from 0, 1 to 2 sccm. The deposition process was monitored by Optical Emission Spectroscopy (OES) to investigate the influence of the active species in plasma. It was observed that increasing the H2 gas flow into the plasma the luminescent intensities associated to the species changed. In this case, the luminescence of N2 (391,4nm) species was not proportional to the increasing of the H2 gas into the reactor. Other parameters investigated were diameter and number of holes in the cage. The analysis by Grazing Incidence X-Ray Diffraction (GIXRD) confirmed that the obtained films are composed by TiN and they may have variations in the nitrogen amount into the crystal and in the crystallite size. The optical microscopy images provided information about the homogeneity of the films. The atomic force microscopy (AFM) results revealed some microstructural characteristics and surface roughness. The thickness was measured by ellipsometry. The optical properties such as transmittance and reflectance (they were measured by spectrophotometry) are very sensitive to changes in the crystal lattice of the material, chemical composition and film thicknesses. Therefore, such properties are appropriate tools for verification of this process control. In general, films obtained at 0 sccm of H2 gas flow present a higher transmittance. It can be attributed to the smaller crystalline size due to a higher amount of nitrogen in the TiN lattice. The films obtained at 1 and 2 sccm of H2 gas flow have a golden appearance and XRD pattern showed peaks characteristics of TiN with higher intensity and smaller FWHM (Full Width at Half Maximum) parameter. It suggests that the hydrogen presence in the plasma makes the films more stoichiometric and becomes it more crystalline. It was observed that with higher number of holes in the lid of the cage, close to the region between the lid and the sample and the smaller diameter of the hole, the deposited film is thicker, which is justified by the most probability of plasma species reach effectively the sample and it promotes the growth of the film

Comportamento magnético de compósitos de matriz polimérica com adição de ferritas

Polymer matrix composites offer advantages for many applications due their combination of properties, which includes low density, high specific strength and modulus of elasticity and corrosion resistance. However, the application of non-destructive techniques using magnetic sensors for the evaluation these materials is not possible since the materials are non-magnetizable. Ferrites are materials with excellent magnetic properties, chemical stability and corrosion resistance. Due to these properties, these materials are promising for the development of polymer composites with magnetic properties. In this work, glass fiber / epoxy circular plates were produced with 10 wt% of cobalt or barium ferrite particles. The cobalt ferrite was synthesized by the Pechini method. The commercial barium ferrite was subjected to a milling process to study the effect of particle size on the magnetic properties of the material. The characterization of the ferrites was carried out by x-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM) and vibrating sample magnetometry (VSM). Circular notches of 1, 5 and 10 mm diameter were introduced in the composite plates using a drill bit for the non-destructive evaluation by the technique of magnetic flux leakage (MFL). The results indicated that the magnetic signals measured in plates with barium ferrite without milling and cobalt ferrite showed good correlation with the presence of notches. The milling process for 12 h and 20 h did not contribute to improve the identification of smaller size notches (1 mm). However, the smaller particle size produced smoother magnetic curves, with fewer discontinuities and improved signal-to-noise ratio. In summary, the results suggest that the proposed approach has great potential for the detection of damage in polymer composites structures

Estudo dos traços de personalidade e da ideação suicida numa amostra de jovens-adultos

Dissertação de Mestrado, Psicologia Clínica e da Saúde, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2016

Contribution to the study of prognostic factors in canine oral squamous cell carcinoma

Tese de Doutoramento em Ciências Veterinárias, na Especialidade de Clínica

As motivações para o voluntariado : estudo exploratório numa amostra de estudantes do ensino superior politécnico

A motivação para o voluntariado foi o tema escolhido para o presente estudo, nomeadamente no que respeita àquele que é exercido por estudantes do ensino superior politécnico. Dada a escassez de investigações publicadas nesta área, o objetivo deste estudo é o de avaliar as motivações para o voluntariado numa amostra de conveniência constituída por 356 estudantes e o de explorar eventuais diferenças destas motivações e práticas de voluntariado em função de variáveis sociodemográficos ou de outras variáveis atitudinais mais específicas. A recolha dos dados foi realizada em pleno contexto académico, através da inquirição dos alunos do Instituto Politécnico de Coimbra (IPC), com o fito de caracterizar aqueles que realizam voluntariado e as suas respetivas motivações. Este processo é efetuado através de questionário inquirindo dados sociodemográficos e características específicas de voluntariado, aplicando três escalas: a primeira, o Inventário de Motivações para o Voluntariado - IMV de Clary e Snyder (1998), na versão portuguesa de Gonçalves, Monteiro e Pereira (2011), a segunda, das Atitudes Altruístas de Loureiro e Lima (2009) e a terceira de Webb, Green & Brashear (2000) a Escala de Ajudar os Outros.

O papel do perfecionismo no desenvolvimento de sintomas psicopatológicos numa amostra de jovens adultos

Dissertação de Mestrado, Psicologia Clínica e da Saúde, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2016

Representações parentais e traços disfuncionais de personalidade: Um estudo com uma amostra de estudantes universitários

O objetivo do presente trabalho foi estudar a relação entre representações parentais e traços disfuncionais de personalidade em sujeitos adultos da população não-clínica. Participaram 177 estudantes universitários, dos quais 104 eram mulheres e 73 eram homens, com idades entre os 18 e os 43 anos (M=22,66; DP=4,054). Foi aplicado o Millon Clínical Multiaxial Inventory-II, o Parental Bonding Instrument e o Object Relations lnventory. De acordo com os resultados, existe uma relação entre alguns tipos de traços disfuncionais da personalidade e experiências disruptivas na relação precoce com ambas as figuras parentais, como a falta de autonomia psicológica e instrumental sentida, e com determinados elementos das representações das figuras parentais, como a perceção de uma menor benevolência ou maior punição. Encontram-se também diferenças entre sujeitos do sexo masculino e do sexo feminino no que respeita ao padrão específico de correlações entre traços de personalidade e características da relação e das representações parentais. ABSTRACT: The purpose of this work was to study the relation between parental representations and dysfunctional personality traits in adult subjects from a non-clinical population. Participants were 177 university students, 104 of which were female and 73 were men. Ages ranged from 18 to 43 years old (M=22,66; DP=4,054). The Millon Clinical Multiaxial Inventory-II, the Parental Bonding lnstrument and the Object Relations Inventory were administered. According to the results, there is a relation between certain types of dysfunctional personality traits and disruptive experiences in the early relations with both caregivers, like a perceived lack of psychological and instrumental autonomy, and with certain elements of parental representations, like the perception of less benevolence or a more punitive attitude. Differences between male and female subjects, concerning the specific pattern of correlations between personality traits and parental relations' and representations' characteristics, were also obtained.

Experiências relacionais na infância e vinculação amorosa no adulto: Um estudo com uma amostra de estudantes universitários

Este estudo debruça-se sobre as experiências relacionais na infância, com as figuras significativas, dimensões e estilos de vinculação amorosa no adulto, de acordo com a Teoria das Relações de Objeto e a Teoria da Vinculação. Participaram 187 estudantes da Universidade de Évora, 109 mulheres e 78 homens. As idades variaram entre os 18 e os 43 anos (M= 22,82; DP= 4,20). Aplicou-se o Protocolo de Avaliação dos Marcadores do Desenvolvimento na Psicopatologia (PAMaDeP, Soares, Rangel-Henriques, Neves e Pinho, 1999) e a versão portuguesa (Ramos, Leal & Maroco, 2006) do Parental Bonding lnstrument (PBI) referente às experiências na infância. Para avaliar a vinculação amorosa foi usada a versão portuguesa (Fonseca, Martins, Soares, Carvalho, Tereno e Carvalho, 2005) do Reciprocai Attachment Questionnaire, (RAQ) e do Loving and Working (L&W, Fonseca, Soares & Martins, 2006). Os resultados são discutidos de um ponto de vista desenvolvimentista, particularmente segundo a perspetiva da Teoria da Vinculação. ABSTRACT: This study focuses on the relational experiences in childhood, with significant figures, dimensions and styles of romantic attachment in adults, according with Object Relations Theory and Attachment Theory Teoria da Vinculação. 187 students from Universidade de Évora had participate, 109 women and 78 men. Ages are ranged from 18 to 43 years (M=22,82; DP=4,20). We used the Protocolo de Avaliação dos Marcadores do Desenvolvimento na Psicopatologia (PAMaDeP, Soares, Rangel-Henriques, Neves e Pinho, 1999) and the Portuguese version (Ramos, Leal & Maroco, 2006) of the Parental Bonding lnstrument (PBI) for the childhood experiments. ln order to avaliate the romantic attachment used the Portuguese version (Fonseca, Martins, Soares, Carvalho, Tereno, e Carvalho, 2005) from the Reciprocal Attachment Questionnaire (RAQ) and from Loving and Working (L&W, Fonseca, Soares & Martins, 2006). The results are discussed from a developmental point of view, particularly from the perspective of Attachment Theory.

Tamanho efetivo populacional e diversidade genética em progênies de Pinus caribaea var. hondurensis.

2015