Incorporation of Hysteretic Effects in Model-Order Reduction Analysis of Magnetic Devices

The ability to predict the properties of magnetic materials in a device is essential to ensuring the correct operation and optimization of the design as well as the device behavior over a wide range of input frequencies. Typically, development and simulation of wide-bandwidth models requires detailed, physics-based simulations that utilize significant computational resources. Balancing the trade-offs between model computational overhead and accuracy can be cumbersome, especially when the nonlinear effects of saturation and hysteresis are included in the model. This study focuses on the development of a system for analyzing magnetic devices in cases where model accuracy and computational intensity must be carefully and easily balanced by the engineer. A method for adjusting model complexity and corresponding level of detail while incorporating the nonlinear effects of hysteresis is presented that builds upon recent work in loss analysis and magnetic equivalent circuit (MEC) modeling. The approach utilizes MEC models in conjunction with linearization and model-order reduction techniques to process magnetic devices based on geometry and core type. The validity of steady-state permeability approximations is also discussed.

Tratamento informacional da Coleção Telegráfica do Museu Correios : análise sob a perspectiva científica, tecnológica e de cultura material

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciência da Informação, Programa de Pós-Graduação em Ciência da Informação, 2016.

Use of acoustic telemetry techniques to understand the individual variability in movement ecology of juvenile lemon sharks, Negaprion brevirostris, in natural conditions, around Bimini Islands, Bahamas: a comparison study with preliminary personality traits observed in mesocosms

Dissertação de Mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016

Medidas individualizadas de mudança: análise das propriedades psicométricas do PSYCHLOPS

Neste estudo apresentam-se dados referentes à fiabilidade, validade e sensibilidade para detetar mudança de uma medida individualizada de mudança (MIM), o PSYCHLOPS. Os dados foram recolhidos em quatro países, e dividem-se por seis amostras, totalizando 1053 participantes. Pretende-se aprofundar o conhecimento acerca das propriedades psicométricas e da sua adequabilidade, em MIM no geral, e no PSYCHLOPS, em particular. Após avaliar as propriedades psicométricas separadamente por amostra, procedeu-se à sua integração mediante métodos de meta-análise. O valor global de alfa de .82 indica uma boa consistência interna, mas a sua interpretação é dificultada pela não equivalência de itens. A correlação entre o PSYCHLOPS e o CORE-OM é de .63, e a correlação entre os scores de mudança das duas medidas é .67. Os dados suportam as hipóteses referentes à validade, mas suscitam dúvidas quanto à estrutura do PSYCHLOPS, e quanto à adequabilidade da avaliação psicométrica tradicional em MIM; Abstract: Various evidence regarding reliability, validity, and responsiveness of PSYCHLOPS, a patient-generated outcome measure (PGOM), are presented. Data comes from three countries, in a total of seven data sets comprising 1053 participants. The purpose of this study is to deepen the understanding of psychometric properties in PGOMs, and in PSYCHLOPS in particular. Following psychometric analysis by sample, meta-analysis procedures were used to calculate overall values. Overall mean internal consistency (alpha) was .82. Overall mean correlation between PSYCHLOPS and CORE-OM is r = .63, and overall mean correlation between change scores is r = .67. Overall mean internal consistency is good, but item non-equivalency makes interpretation difficult. Data support hypotheses regarding correlations, but cast doubt over PSYCHLOPS’ internal structure, and over suitability of classical psychometric evaluation in PGOM.

Análise paramétrica da simulação composicional do processo de Drenagem Gravitacional Assistida por Gás (GAGD)

In Brazil and around the world, oil companies are looking for, and expected development of new technologies and processes that can increase the oil recovery factor in mature reservoirs, in a simple and inexpensive way. So, the latest research has developed a new process called Gas Assisted Gravity Drainage (GAGD) which was classified as a gas injection IOR. The process, which is undergoing pilot testing in the field, is being extensively studied through physical scale models and core-floods laboratory, due to high oil recoveries in relation to other gas injection IOR. This process consists of injecting gas at the top of a reservoir through horizontal or vertical injector wells and displacing the oil, taking advantage of natural gravity segregation of fluids, to a horizontal producer well placed at the bottom of the reservoir. To study this process it was modeled a homogeneous reservoir and a model of multi-component fluid with characteristics similar to light oil Brazilian fields through a compositional simulator, to optimize the operational parameters. The model of the process was simulated in GEM (CMG, 2009.10). The operational parameters studied were the gas injection rate, the type of gas injection, the location of the injector and production well. We also studied the presence of water drive in the process. The results showed that the maximum vertical spacing between the two wells, caused the maximum recovery of oil in GAGD. Also, it was found that the largest flow injection, it obtained the largest recovery factors. This parameter controls the speed of the front of the gas injected and determined if the gravitational force dominates or not the process in the recovery of oil. Natural gas had better performance than CO2 and that the presence of aquifer in the reservoir was less influential in the process. In economic analysis found that by injecting natural gas is obtained more economically beneficial than CO2

Nova técnica para obtenção de fraturas com altíssima condutividade em poços de petróleo

Increase hydrocarbons production is the main goal of the oilwell industry worldwide. Hydraulic fracturing is often applied to achieve this goal due to a combination of attractive aspects including easiness and low operational costs associated with fast and highly economical response. Conventional fracturing usually involves high-flowing high-pressure pumping of a viscous fluid responsible for opening the fracture in the hydrocarbon producing rock. The thickness of the fracture should be enough to assure the penetration of the particles of a solid proppant into the rock. The proppant is driven into the target formation by a carrier fluid. After pumping, all fluids are filtered through the faces of the fracture and penetrate the rock. The proppant remains in the fracture holding it open and assuring high hydraulic conductivity. The present study proposes a different approach for hydraulic fracturing. Fractures with infinity conductivity are formed and used to further improve the production of highly permeable formations as well as to produce long fractures in naturally fractured formations. Naturally open fractures with infinite conductivity are usually encountered. They can be observed in rock outcrops and core plugs, or noticed by the total loss of circulation during drilling (even with low density fluids), image profiles, pumping tests (Mini-Frac and Mini Fall Off), and injection tests below fracturing pressure, whose flow is higher than expected for radial Darcian ones. Naturally occurring fractures are kept open by randomly shaped and placed supporting points, able to hold the faces of the fracture separate even under typical closing pressures. The approach presented herein generates infinite conductivity canal held open by artificially created parallel supporting areas positioned both horizontally and vertically. The size of these areas is designed to hold the permeable zones open supported by the impermeable areas. The England & Green equation was used to theoretically prove that the fracture can be held open by such artificially created set of horizontal parallel supporting areas. To assess the benefits of fractures characterized by infinite conductivity, an overall comparison with finite conductivity fractures was carried out using a series of parameters including fracture pressure loss and dimensionless conductivity as a function of flow production, FOI folds of increase, flow production and cumulative production as a function of time, and finally plots of net present value and productivity index

Analyse comparative de systèmes de construction industrialisés et leur applicabilité à une habitation multifamiliale verticale pour la classe moyenne à Recife (Brésil).

Depuis le début du XXe siècle, les architectes et ingénieurs anticipaient et idéalisaient l'industrialisation des bâtiments afin que les pièces des édifices puissent être conçues dans une usine de montage pour procéder ensuite à leur assemblage sur les chantiers. À l'heure actuelle, grâce à des chercheurs dédiés, cette industrialisation s’est concrétisée et de nombreux systèmes de construction industrialisés existent dans le monde entier, adaptés à des environnements particuliers. Dans ce contexte, cette étude a pour but d'analyser comparativement plusieurs systèmes à l’aide de certains critères d’évaluation, et de sélectionner, deux systèmes préfabriqués les mieux adaptés aux habitations multifamiliales verticales destinées à une population de classe moyenne aisée de la ville de Recife, au Brésil. La méthodologie s’inspire de l'approche systémique, utilisée par White (1970) et Richard (2002), les deux se caractérisant par une démarche évaluative. Ainsi avons-nous choisi comme étant les plus appropriés, parce que répondant bien au cadre général de Recife, le système préusiné en panneaux DESCON ainsi que celui de poutres et colonnes, commercialisé par les entreprises T&A et PDI, les deux en béton.

Analyse comparative de systèmes de construction industrialisés et leur applicabilité à une habitation multifamiliale verticale pour la classe moyenne à Recife (Brésil)

Depuis le début du XXe siècle, les architectes et ingénieurs anticipaient et idéalisaient l'industrialisation des bâtiments afin que les pièces des édifices puissent être conçues dans une usine de montage pour procéder ensuite à leur assemblage sur les chantiers. À l'heure actuelle, grâce à des chercheurs dédiés, cette industrialisation s’est concrétisée et de nombreux systèmes de construction industrialisés existent dans le monde entier, adaptés à des environnements particuliers. Dans ce contexte, cette étude a pour but d'analyser comparativement plusieurs systèmes à l’aide de certains critères d’évaluation, et de sélectionner, deux systèmes préfabriqués les mieux adaptés aux habitations multifamiliales verticales destinées à une population de classe moyenne aisée de la ville de Recife, au Brésil. La méthodologie s’inspire de l'approche systémique, utilisée par White (1970) et Richard (2002), les deux se caractérisant par une démarche évaluative. Ainsi avons-nous choisi comme étant les plus appropriés, parce que répondant bien au cadre général de Recife, le système préusiné en panneaux DESCON ainsi que celui de poutres et colonnes, commercialisé par les entreprises T&A et PDI, les deux en béton.

Saúde oral versus drogas

O consumo de estupefacientes tem aumentado nos últimos anos e o atendimento médico a pacientes consumidores de drogas tem-se tornado cada vez mais frequente. Patologias orais como xerostomia, cárie dentária, doença periodontal, estomatites, erosão, bruxismo, neoplasias, entre outras, são frequentemente encontradas nesse grupo de indivíduos. Essas alterações ocorrem com mais frequência em consumidores de drogas pelas mudanças que elas provocam a nível sistémico, local e até mesmo comportamental. As alterações de ordem sistémica dizem respeito a modificações no funcionamento dos Sistemas Nervoso Central, Cardiovascular e Imunológico. As de ordem local, pelo trauma nos tecidos que essas substâncias podem provocar e também de ordem comportamental pelo descuido com a Saúde Geral e principalmente com a Saúde Oral praticado pelos dependentes de químicos. A soma dessas modificações além de poder provocar essas alterações, podem ainda acarretar complicações pós e trans-operatórias. Diante disto, o Médico Dentista desempenha um papel importante no diagnóstico, prevenção, tratamento e planeamento do atendimento desses indivíduos, reduzindo a exposição desses pacientes a riscos e contribuindo para a recuperação integral dos mesmos.

Análisis observacional de los saques de esquina y tiros libres indirectos en el fútbol femenino de alto nivel

El presente trabajo estudia los saques de esquina y tiros libres indirectos mediante la metodología observacional con el objetivo de conocer la importancia de las acciones a balón parado en el fútbol femenino de alto nivel. Se han registrado un total de 9 partidos disputados por el F.C. Barcelona Femenino en la temporada 2014 – 2015. Para realizar el análisis de datos elaboramos un formato de campo constituido por 12 criterios con una posterior valoración de la calidad del dato. Se llevará a cabo mediante el estudio de la incidencia de los saques de esquina y tiros libres indirectos, así como el grado de eficacia, teniendo presentes la lateralidad y la zona de finalización. Además de analizar la relación que existe entre los saques de esquina y los tiros libres indirectos con el tiempo y el vínculo de los goles analizados con el tiempo. Encontramos que el grado de eficacia en relación con la incidencia es muy bajo en ambos tipos de acciones, que se realizan con trayectorias cerradas y donde la zona de finalización, en la mayoría de acciones a balón parado, son enviadas al primer palo. Por otro lado, se produce un mayor número de saques de esquina en el último tercio de la primera parte y los dos últimos tercios de la segunda parte, obteniendo mayores diferencias en los valores de la segunda parte. En cambio, la mayor parte de los tiros libres indirectos se ejecutan en los últimos minutos de cada parte. Y, que los goles conseguidos con ambas acciones se han conseguido en los últimos minutos de las respectivas partes.

The Citadel blueprint : the strategic plan for educating principled leaders

The Citadel conducted a campus-wide planning process that engaged the campus community in a discussion of the institution’s strategic goals and future vision, culminating in The Citadel’s 2009-2012 Strategic Plan. This planning document communicates The Citadel’s priorities and lays the foundation for a successful capital campaign that will take the institution to new heights of academic and leadership excellence. Building upon previous strategic planning processes, our mission, and core values, eight strategic initiatives will continue to form the foundation of the institution’s planning efforts and help define the college’s planning priorities.

The Citadel blueprint 2010 annual report

The Citadel conducted a campus-wide planning process that engaged the campus community in a discussion of the institution’s strategic goals and future vision, culminating in The Citadel’s 2009-2012 Strategic Plan. This annual planning document communicates The Citadel’s priorities and lays the foundation for a successful capital campaign that will take the institution to new heights of academic and leadership excellence. Building upon previous strategic planning processes, our mission, and core values, eight strategic initiatives will continue to form the foundation of the institution’s planning efforts and help define the college’s planning priorities.

The Citadel blueprint 2011 annual report

The Citadel conducted a campus-wide planning process that engaged the campus community in a discussion of the institution’s strategic goals and future vision, culminating in The Citadel’s 2009-2012 Strategic Plan. This annual planning document communicates The Citadel’s priorities and lays the foundation for a successful capital campaign that will take the institution to new heights of academic and leadership excellence. Building upon previous strategic planning processes, our mission, and core values, eight strategic initiatives will continue to form the foundation of the institution’s planning efforts and help define the college’s planning priorities.

DHEC strategic plan

This short strategic plan explains the agency's vision, mission and core values. It's agency strategies are broken down into five strategic focus areas, the imperatives that unite its teams, align its work, and enable the agency to move forward in our ambitious mission. Those five strategies are: education and engagement, science in action, leadership and contribution, service and accessibility and operational excellence.

Using an evidence-based online module to improve parents’ ability to manage their child with Developmental Coordination Disorder

Background : Developmental coordination disorder (DCD) is a prevalent neurodevelopmental disorder. Best practices include raising parents’ awareness and building capacity but few interventions incorporating these best practices are documented. Objective : To examine whether an evidence-based online module can increase the perceived knowledge and skills of parents of children with DCD, and lead to behavioural changes when managing their child’s health condition. Methods : A mixed-methods, before-after-follow-up design guided by the theory of planned behaviour was employed. Data about the knowledge, skills and behaviours of parents of children with DCD were collected using questionnaires prior to completing the module, immediately after, and three months later. One-way repeated measures ANOVAs and thematic analyses were performed on data as appropriate. Results : Fifty-eight participants completed all questionnaires. There was a significant effect of time on self-reported knowledge [F(2.00,114.00)=16.37, p=0.00] and skills [F(1.81,103.03)=51.37, p=0.00] with higher post- and follow-up scores than pre-intervention scores. Thirty-seven (65%) participants reported an intention to change behaviour postintervention; 29 (50%) participants had tried recommended strategies at follow-up. Three themes emerged to describe parents’ behavioural change: sharing information, trialing strategies and changing attitudes. Factors influencing parents’ ability to implement these behavioural changes included clear recommendations, time, and ‘right’ attitude. Perceived outcomes associated with the parental behavioural changes involved improvement in well-being for the children at school, at home, and for the family as a whole. Conclusions : The online module increased parents’ self-reported knowledge and skills in DCD management. Future research should explore its impacts on children’s outcomes long-term.