Estudo da evolução das tensões residuais através da difratometria de raios x em aço rolamento submetido a esforços cíclicos

The micro-deformations caused by cyclic loading origins the variation of the distances between atoms of the crystal lattice producing the irreversible component. In order to study and understand the microstructural behavior of the material this paper investigated the influence suffered by residual stresses in thrust rolling bearing races fabricated in AISI 52100 steel, after tests by cyclic rolling contact in a tribometer at 1m/s under two contact pressures (500 MPa and 1400 MPa) in dry and boundary lubrication conditions. Procedures of tests thermo-acustically isolated were developed for monitoring the contact temperature and sound pressure level signals to establish a comparison between the residual stress measurements, micro-hardness Vickers and micrographic registers searching an indication of wear evolution. The sin²ψ method by X-ray diffraction technique was used to quantify the residual stresses. Three raceway zones were selected for the evaluation of wear and surface morphology after predetermined cycling, comparing with their new condition ("as received"). Micro-hardness and residual stress measurements showed significant changes after the tests and it was possible to observe the relationship between the increase of sound pressure level and the residual stress for dry and lubricated conditions.

Quando fé e gestão se encontram: compreendendo uma ONG de filosofia protestante sob as lentes da prática e do Sensemaking

We find in Brazil the reality of religious pluralism. From the end of XIX century until now, the religious scenario became more diversified in a process of acceptance and legitimation of different religions. In the same period, the Third Sector was largely developed up until its current form: complex, broad and plural as well. In this context, we find non profitable organizations that provide services under a religious phylosophy. One in particular, placed in Uberlândia-MG, protestant, has the fearures of a big company and is the largest one among the ones that provide social services and receive public funds in the city: Missão Luz. Thinking about the organization, some questions came to mind: is there a noticeable influence of the religious orientation on practices? How do managers understand and make sense of their practices? Adopting Chanlat’s (1996) concept of management mode, the perspective proposed by the Practice Based Studies (GHERARDI, 2013) and the sensemaking studies (WEICK, 1995), I developed a research that intended to understand Missão Luz’ management practices. Three sources of data were used – documents, shadowing and interviews – to understand, in the most complete way, organization’s management practices, using managers’ perspective. Results pointed to a noticeable relation between faith and management. Ten practices were identified among managers: council decisions, appreciation for excellence, respect for authority figures, giving second chances to employees, desire to be a reference, results quantification, search for professionalization, organization, formalization and standardization. The first five practices were heavily influenced by religious principles, and the five last were influenced by instrumental rationality, usually found in the Second Sector. It was noticed that faith was also related to those last practices, justifying them for their contribution for achieving excellence e consequent action of glorifying God. Practices are maintained e passed by the cultivation of the Mission’s DNA, an organization’s way of doing things, and by the belief of the role of the leader maintaining this DNA. Associated to practices, sensemaking moments were analyzed, situations where there order was disrupted and managers had to make sense e act on this understanding. These situations were divided in three themes: “fly the flag of the company”, changes in schools’ management and God’s purpose and sovereignty. The paper is finished with some suggestions for future researches.

Escala diagramática e influência de sistemas de produção na ocorrência do crestamento gomoso da melancia

CHAPTER 1 - The gummy stem blight, caused by the fungus D. bryoniae, is a disease commonly found in watermelon cultivated in several countries. In Brazil, there are numerous studies related to the disease, but there are not uniform methods for quantifying of disease severity in the field. Thus, we developed a diagrammatic scale based on scanned photos of watermelon leaves infected with D. bryoniae. The scale developed showed levels of 0; 10; 20; 45; 65 and 90% of severity. The scale validation was divided into two parts: initially, 10 evaluators (half with experienced and other half without experience) estimated the disease severity based on the initial observation of 100 photos of watermelon leaves with symptoms of the disease at different severity levels. Before, the same evaluators estimated the disease severity with the support of the scale prepared from the Quant program. Data were analyzed using linear regression and were obtained angular, linear, and correlation coefficients. Based on these data, we determined the accuracy and precision of the evaluations. The correlation coefficients (R2) ranged from 0.88 - 0.97 for the experienced evaluators and from 0.55 - 0.95 for the inexperienced evaluators. The average angular coefficient (A) for inexperienced evaluators was 20.42 and 8.61 with and without the support of diagrammatic scale, respectively. Experienced evaluators showed values of average linear coefficient of 5.30 and 1.68 with and without the support of diagrammatic scale, respectively. The absolute errors analysis indicated that the use of diagrammatic scale contributed to minimize the flaws in the severity levels estimation. The diagrammatic scale proposed shown adequate for gummy stem blight severity evaluation in watermelon. CHAPTER 2 - The gummy stem blight (Didymella bryoniae) is a disease that affects the productivity of watermelon leading to losses over 40%. This study aimed to evaluate the efficiency of different production systems in control of gummy stem blight in watermelon for to establish efficient methods to combat the disease. There were applied the following treatments: conventional tillage (T1), integrated management (T2) and organic management (T3). In T1 and T2 were applied mineral fertilization and T3 was used bovine manure. There was application of fungicides and insecticides in commercial dose in T1 and T2, being after soil chemical analysis in T2. Disease severity was assessed by grading scale. The experimental design was randomized blocks. The severity of gummy stem blight has increased substantially during the fruit formation. Watermelon plants grown with integrated management (T2) showed lower levels of disease severity, while plants in organic management (T3) exhibited higher levels of severity. We conclude that management based on judicious accompaniments in field represents best way to achieve the phytosanitary aspect adequate for cultivation of watermelon in Tocantins.

Determinação de teor de biodieseis de algodão e pinhão manso em misturas com diesel usando espectroscopia no infravermelho médio e quadrados mínimos parciais

Biodiesel is a renewable fuel derived from vegetable oils or animal fats, which can be a total or partial substitute for diesel. Since 2005, this fuel was introduced in the Brazilian energy matrix through Law 11.097 that determines the percentage of biodiesel added to diesel oil as well as monitoring the insertion of this fuel in market. The National Agency of Petroleum, Natural Gas and Biofuels (ANP) establish the obligation of adding 7% (v/v) of biodiesel to diesel commercialized in the country, making crucial the analytical control of this content. Therefore, in this study were developed and validated methodologies based on the use of Mid Infrared Spectroscopy (MIR) and Multivariate Calibration by Partial Least Squares (PLS) to quantify the methyl and ethyl biodiesels content of cotton and jatropha in binary blends with diesel at concentration range from 1.00 to 30.00% (v/v), since this is the range specified in standard ABNT NBR 15568. The biodiesels were produced from two routes, using ethanol or methanol, and evaluated according to the parameters: oxidative stability, water content, kinematic viscosity and density, presenting results according to ANP Resolution No. 45/2014. The built PLS models were validated on the basis of ASTM E1655-05 for Infrared Spectroscopy and Multivariate Calibration and ABNT NBR 15568, with satisfactory results due to RMSEP (Root Mean Square Error of Prediction) values below 0.08% (<0.1%), correlation coefficients (R) above 0.9997 and the absence of systematic error (bias). Therefore, the methodologies developed can be a promising alternative in the quality control of this fuel.

As vogais médias tônicas: um estudo contrastivo da metafonia com base em corpus

This research analyzes the average previous stressed vowels [ε] and [e] and later [ɔ] and [o] in nominal and verbal forms in the 1st person singular and 3rd person singular and plural in the present tense, specifically the umlaut process of mid vowels /e/ and /o/, which assimilate in /ε/ and /ᴐ/ in stressed position. The general objective of this research is to describe and quantify the occurrence of umlaut and subsequently analyze in which words there is regularity or not. As specific objectives we have: i) to compile and to label an oral, spontaneous, synchronic and regional corpus, from radio programs produced in the city of Ituiutaba, Minas Gerais; ii) to describe the characteristics of the corpus to be compiled; iii) to investigate the alternating timbre of mid vowels in stressed position; iv) to identify instances of nominal and verbal umlaut of the middle vowels in stressed position; v) to describe the identified cases of nominal and verbal umlaut; vi) to analyze the probable causes for the variation of the middle vowels. To perform the proposed analysis, we have adopted as a theoretical-methodological basis multi-representational models: Phonology of Use (BYBEE, 2001) and Exemplar Theory (PIERREHUMBERT, 2001) combined with the precepts of Corpus Linguistics (BEBER SARDINHA, 2004). The corpus consisted of 16 radio programs – eight political and eight religious – from the city of Ituiutaba-MG, with recordings of about 20 to 40 minutes. We note, by means of the results generated by WordSmith Tools® software, version 6.0 (SCOTT, 2012), that the analyzed forms show little variation, which shows that the umlaut is a process already lexicalized in participants of the radio programs analyzed. We conclude that the results converge with the proposal of the Phonology of Use (BYBEE, 2001; PHILLIPS, 1984) that less frequent words that have no phonetic environment conducive to change, are changed first.

Aplicação dos Sistemas de Informação Geográfica nas energias renováveis: o potencial da energia solar na ilha de São Vicente – Cabo Verde

Informação Geográfica (SIG) ao estudo das energias renováveis, tendo como caso avaliar o potencial solar na ilha de São Vicente do arquipélago de Cabo Verde. A energia do sol é a principal fonte de energia renovável, e está disponível em quase todas as regiões do planeta. Quantificar o potencial energético solar de um lugar ou região é indispensável, para avaliar as potencialidades de produção de energia fotovoltaica. Outro fator importante prende-se com ordenamento territorial associado à exploração desses recursos energéticos, pelo que devem ser avaliadas as condições técnicas, ambientais e económicas, quando se pretende instalar parques para a produção de energia fotovoltaica. Assim, neste trabalho foram aplicadas as ferramentas SIG, para quantificar a radiação solar mensal e anual da ilha de São Vicente, arquipélago de Cabo Verde, através do modelo Solar Analyst. Numa segunda fase, aplicou-se a técnica de análise multicritério em combinação com os SIGs para definir as áreas mais favoráveis para a instalação de parques de produção de energia elétrica a partir da energia solar. Para o cálculo da radiação solar na ilha de São de Vicente, utilizou-se o modelo digital de terreno (MDT) e a latitude da ilha como parâmetros de entrada ao modelo. Para a análise multicritério definiram-se um conjunto de critérios que devem ser considerados na implementação de parques solares, nomeadamente, a disponibilidade de radiação solar existente na área, a distância à rede de transporte de energia elétrica e à rede viária, o declive do terreno, o uso e ocupação do solo e a proximidade às linhas de água. Para auxiliar na atribuição dos pesos aos critérios utilizados na análise aplicou-se a método Analytic Hierarchy Process (AHP). As áreas resultantes do processo da análise multicritério, foram confrontadas com a Carta de Condicionantes do esquema regional de ordenamento da ilha de São Vicente, aferindo a conformidade das propostas e reajustes subsequentes, de modo a obter os resultados finais.

A Anatomia da Gestão Estratégica: neuroeconomia, gestão de recursos humanos e sistema de gestão de qualidade

Contexto: O trabalho que a seguir se apresenta foi elaborado no âmbito de um novo conceito na gestão do desempenho organizacional, a gestão estratégica multidimensional, onde a neuroeconomia foi associada à perspetiva teórica da gestão estratégica de recursos humanos (Dessler, 2005) e à aplicação do sistema de gestão da qualidade (SGQ), da NP 9001: 2008 (Saraiva e tal, 2009), para formar um método eficaz de conceção dos percursos de operacionalização da organização Objetivos: Pretendeu-se construir uma forma anatómica de gestão de desempenho organizacional através dos três conceitos mencionados, num contexto de gestão estratégica multidimensional, possibilitando a sua quantificação pelo nível de implementação dos requisitos para um sistema de gestão de qualidade, com o intuito de verificar sua viabilidade, sendo a resiliência organizacional dependente em grande medida dos recursos humanos, Método: Pelo conjunto das três áreas mencionadas foi criado um guia de atuação abrangendo as bases fundamentais para o desenvolvimento de uma estrutura organizacional: verificação dos níveis de incidência da gestão do desempenho organizacional; caracterização de diferentes tipos de estratégias de intervenção; implementação de estratégias preventivas e estratégias corretivas; utilização das quatro dimensões PIPE – performance, inovação, processos e empenhamento – como estratégias corretivas; integração das estratégias preventivas com as estratégias corretivas; diagnóstico contínuo de situações problema na gestão do desempenho organizacional; conceção de percursos de intervenção na gestão do desempenho organizacional; conceção de um projeto de gestão estratégica. A amostra final é constituída por uma organização do 3ºsetor, nomeadamente uma IPSS, a Associação Recreativa Cultural e Social das Gândaras, na Lousã, no distrito de Coimbra. Resultados: Com efeito, acredita-se que com este trabalho seja possível quantificar o nível de implementação dos requisitos para um SGQ num contexto de gestão estratégica multidimensional. / Context: The work presented below was prepared as part of a new concept in the management of organizational performance, the multidimensional strategic management, which was associated the neuroeconomics perspetive with the human resourses strategic management (Dessler, 2005) and the application of the quality management system (QMS), NP 9001: 2008 (and such Saraiva, 2009), to form an effective method of conception paths of operation of the organization Objetives: It was intended to build an anatomical shape organizational performance management across the three concepts mentioned in the context of multidimensional strategic management, enabling to quantify the level of implementation of the requirements for a quality management system, in order to verify their viability , and the organizational resilience largely dependent on human resources. Method: For all the three areas mentioned has created an action guide covering the fundamentals for developing an organizational structure: the verification of the incidence levels of organizational performance management; characterization of different types of intervention strategies; implementation of preventive strategies and corrective strategies, using the four dimensions PIPE - performance, innovation, processes and commitment - as corrective strategies; integration of preventive strategies with remedial strategies; diagnosis of problem situations in the ongoing management of organizational performance; conception pathways of intervention in the management of organizational performance; conception of a project of strategic management. The final sample consists of an organization of the 3rd setor, an IPSS, the Associação Recreativa Cultural e Social das Gândaras, in Lousã, in the district of Coimbra. Results: In fact, it is believed that this work is possible to quantify the level of implementation of the requirements for a QMS in a multidimensional context of strategic management.

A importância dos instrumentos de medição e avaliação – PEQ-PT

O principal objetivo na reabilitação de um amputado do membro inferior é a total reintegração na sociedade no máximo das suas capacidades físicas, mentais, emocionais e sociais. Com o intuito de alcançar este objetivo tem surgido um crescente interesse em instrumentos que possam quantificar a mobilidade/funcionalidade, fator muito importante na reabilitação, em pessoas com amputação do membro inferior, a fim de monitorizar com precisão o impacto das intervenções terapêuticas, em particular na funcionalidade obtida com a utilização de próteses para o membro inferior. As tomadas de decisão em saúde deverão ser baseadas em evidência científica. Das inúmeras opções existentes, decidir qual a melhor solução, com base numa sustentação científica, será no futuro próximo uma realidade cada vez mais presente e necessária e uma mais-valia, na argumentação científica, sobre a pertinência ou não de determinadas soluções. O conhecimento dos números de amputações, da sua classificação, etiologia e nível poderá estabelecer a prevalência e as tendências futuras na perda do(s) membro(s) como instrumento importante para o planeamento de cuidados de saúde e para o investimento racional dos recursos. 85% de todas as amputações são do membro inferior. A amputação transtibial é a mais frequente, ocorrendo na faixa etária compreendida entre os 50 e 75 anos, com predomínio para as de etiologia vascular (80%) sendo a diabetes a principal causa, seguida da aterosclerose, embolias e tromboses arteriais, geralmente em sujeitos com idades acima dos 50 anos A amputação por etiologia traumática ocorre em (10,6%), abrangendo jovens adultos (causas laborais e rodoviárias). Nas crianças as causas mais vulgares de amputação são as anomalias congénitas, situações traumáticas e neoplásicas (5,8%). Quanto ao género, 75% da incidência recai sobre o sexo masculino.

Índices de Eficácia e Eficiência para a Política Monetária: Uma análise do desempenho brasileiro nas Metas de Inflação

O presente estudo teve o objetivo de avaliar e quantificar o desempenho da política monetária brasileira no regime de Metas de Inflação, utilizando Indicadores de Eficácia e Eficiência, o que pode ser considerado uma nova metodologia para avaliação de política monetária. Ao final concluiu-se que a política monetária, ao longo dos doze anos completos de Metas de Inflação, foi ineficaz em quatro anos do período e ineficiente em cinco anos, ao passo que a meta da inflação não foi atingida apenas em três anos do período.

Análise de métodos para aplicação de ventilação natural em projetos de edificações em Natal-RN

Natural ventilation is an efficient bioclimatic strategy, one that provides thermal comfort, healthful and cooling to the edification. However, the disregard for quality environment, the uncertainties involved in the phenomenon and the popularization of artificial climate systems are held as an excuse for those who neglect the benefits of passive cooling. The unfamiliarity with the concept may be lessened if ventilation is observed in every step of the project, especially in the initial phase in which decisions bear a great impact in the construction process. The tools available in order to quantify the impact of projected decisions consist basically of the renovation rate calculations or computer simulations of fluids, commonly dubbed CFD, which stands for Computational Fluid Dynamics , both somewhat apart from the project s execution and unable to adapt for use in parametric studies. Thus, we chose to verify, through computer simulation, the representativeness of the results with a method of simplified air reconditioning rate calculation, as well as making it more compatible with the questions relevant to the first phases of the project s process. The case object consists of a model resulting from the recommendations of the Código de Obras de Natal/ RN, customized according to the NBR 15220. The study has shown the complexity in aggregating a CFD tool to the process and the need for a method capable of generating data at the compatible rate to the flow of ideas and are discarded during the project s development. At the end of our study, we discuss the necessary concessions for the realization of simulations, the applicability and the limitations of both the tools used and the method adopted, as well as the representativeness of the results obtained

Análise comparativa "in vitro" da extrusão apical de detritos originados por diferentes técnicas de instrumentação do sistema de canais radiculares

Introdução: A extrusão apical detritos (EAD) consequência indesejável da instrumentação canalar pode ser associada a dor/edema, podendo atrasar a cicatrização periapical. O nosso trabalho teve como objectivo avaliar e quantificar a EAD em canais instrumentados por sistemas de instrumentação rotatória contínua e reciprocante. Materiais e Métodos: 80 dentes monocanalares sem tratamento endodôntico prévio foram aleatoriamente divididos em 4 grupos (n=20): One Shape® Protaper® NEXT, Hyflex® EDM e WaveOne® Gold. Um tubo de Eppendorf (TdE) foi pesado antecipadamente numa balança analítica de precisão e com um dente inserido foi montado num dispositivo modificado, similar ao método descrito por Myers & Montgomery. Os canais foram instrumentados e irrigados com água destilada. Os dentes instrumentados foram removidos dos TdE e estes preenchidos com água destilada até perfazer 1,5ml, incubados a 70ºC durante cinco dias sendo pesados novamente, calculando a diferença entre o peso inicial e final determinando o peso dos detritos. Os dados foram analisados estatisticamente utilizando o IBM SPSS Statistics 22, considerando α=0,05. Efetuaram-se testes Kruskal-Wallis e post-hoc com ajustamento do ρ-value pelo método Dunn-Bonferroni. Resultados: Houve EAD em todas as técnicas de instrumentação. A análise estatística mostrou haver diferenças significativas na EAD entre as técnicas utilizadas (α=0,002). Entre as técnicas WaveOne® Gold e One Shape® (α=0,003), WaveOne® Gold e Protaper® NEXT (α=0,023) e WaveOne® Gold e Hyflex® EDM (α=0,028). Conclusões: A técnica One Shape® apresentou menor EAD e a técnica WaveOne® Gold com movimento reciprocante constitui maior fator de risco tendo apresentado maior EAD. Os resultados deste estudo indicam que os profissionais devem estar cientes para a EAD que pode ocorrer com cada instrumento, o que poderá servir de base para a selecção de um instrumento particular. Implicações clínicas: A escolha do sistema de instrumentação canalar influencia a extrusão de detritos. Fontes de financiamento: Agradecimentos as empresas; Micro-Mega, França, COLTÉNE e Dentsply Maillefer, Suíça.

Análise de componentes arquitetônicos para potencialização da ventilação natural com ênfase em captadores de vento

The building envelope is the principal mean of interaction between indoors and environment, with direct influence on thermal and energy performance of the building. By intervening in the envelope, with the proposal of specific architectural elements, it is possible to promote the use of passive strategies of conditioning, such as natural ventilation. The cross ventilation is recommended by the NBR 15220-3 as the bioclimatic main strategy for the hot and humid climate of Natal/RN, offering among other benefits, the thermal comfort of occupants. The analysis tools of natural ventilation, on the other hand, cover a variety of techniques, from the simplified calculation methods to computer fluid dynamics, whose limitations are discussed in several papers, but without detailing the problems encountered. In this sense, the present study aims to evaluate the potential of wind catchers, envelope elements used to increase natural ventilation in the building, through CFD simplified simulation. Moreover, it seeks to quantify the limitations encountered during the analysis. For this, the procedure adopted to evaluate the elements implementation and efficiency was the CFD simulation, abbreviation for Computer Fluid Dynamics, with the software DesignBuilder CFD. It was defined a base case, where wind catchers were added with various settings, to compare them with each other and appreciate the differences in flows and air speeds encountered. Initially there has been done sensitivity tests for familiarization with the software and observe simulation patterns, mapping the settings used and simulation time for each case simulated. The results show the limitations encountered during the simulation process, as well as an overview of the efficiency and potential of wind catchers, with the increase of ventilation with the use of catchers, differences in air flow patterns and significant increase in air speeds indoors, besides changes found due to different element geometries. It is considered that the software used can help designers during preliminary analysis in the early stages of design

Avaliação da interação entre aflatoxina M1 e B1 com a fração proteica do leite

Dissertação composta por 02 artigos.

Por uma moradia termicamente confortável: proposta de habitação de interesse social com ênfase no conforto térmico

This research covers the topic of social housing and its relation to thermal comfort, so applied to an architectural and urban intervention in land situated in central urban area of Macaíba/RN, Brazil. Reflecting on the role of design and use of alternative building materials in the search for better performance is one of its main goals. The hypothesis is that by changing design parameters and choice of materials, it is possible to achieve better thermal performance results. Thus, we performed computer simulations of thermal performance and natural ventilation using computational fluid dynamics or CFD (Computational Fluid Dynamics). The presentation of the thermal simulation followed the methodology proposed in the dissertation Negreiros (2010), which aims to find the percentage of the amount of hours of comfort obtained throughout the year, while data analysis was made of natural ventilation from images generated by the images extracted from the CFD. From model building designed, was fitted an analytical framework that results in a comparison between three different proposals for dwellings housing model, which is evaluated the question of the thermal performance of buildings, and also deals with the spatial variables design, construction materials and costs. It is concluded that the final report confirmed the general hypotheses set at the start of the study, it was possible to quantify the results and identify the importance of design and construction materials are equivalent, and that, if combined, lead to gains in thermal performance potential.

Protemic characterization of peripheral blood mononuclear cells

Peripheral blood mononuclear cells (PBMCs) play quite diverse and important roles in monitoring immune homeostasis. Thus, these subset of blood cells may provide access to potential physiological relevant biomolecules, namely proteins. For this reason, PBMCs represent a promising biological sample in scientific research, particularly as a source of potential biological markers discovery of the most diverse diseases. Prior studies of proteomic characterization of PBMCs from healthy individuals lack either the identification of a large number of proteins or its quantification in a way that is compatible with the search of potential biomarker candidates. Therefore, this study aimed to provide a comprehensive PBMCs proteome characterisation as well as to create a SWATH library. It was also evaluated if by using the BD Vacutainer® CPT™ tubes for PBMCs isolation, it would be possible to identify a larger number of immunologically relevant proteins in comparison to plasma samples. The enrichment test assay revealed that it is possible to identify more immune-related proteins from isolated PBMCs than from plasma. Moreover, the majority of the quantified proteins with an “immune system” GO term assigned is present in higher amounts in PBMCs samples. 2D LC-MS/MS proved to be the best approach to use in qualitative analysis of PBMCs and in the construction of a SWATH library, since it resulted in an increase of both identified and quantified proteins (66.3% and 16.9%, respectively) in comparison to 1D LC-MS/MS. A total of 2071 proteins were identified and it was possible to quantify 922 different proteins among six distinct samples. From these proteins, 445 were commom between all individuals. In conclusion, this work provides a comprehensive PBMCs proteome dataset that will be useful in further studies that focus on the search for potential biological markers of various pathologies in these cells. Additionally, SWATH-MS proved to be a reproducible and effective acquisition method to quantify PBMCs proteins.