University of Michigan Football Team, 1934

Back Row: Cedric Sweet, Franklin Lett, Steve Remias, Carl Carr, Russ Oliver, captain Thomas Austin, Robert Johnson, Willard Hildebrandt, Edward Stone, Michael Savage, Thomas Oyler, Harry Wright, Joe Fisher, Jack Liffiton, John Viergever, Herman Everhardus, Willis Ward, Matt Patanelli, Robert Graper

Middle Row: John Mumford, James Kidston, William Borgmann, Chester Beard, Howard Triplehorn, Vincent Pope, Ernest Pederson, Joseph Ellis, Robert Amrine, Russell Fuog, Stanton Schuman, Vincent Aug, Winfred Nelson, John Regeczi

Front Row: John Connolly, Jesse Garber, David Barnett, John Rieck, Frank Bissell, Eli Soodik, William Renner, Richard James, Ferris Jennings, Harry Pillinger, Harry Lutomski, George Bolas, Charles Brandman, Gerald Ford

1933 UM Football Team, full squad posed on Ferry Field

Back Row: Herman Everhardus, Sylvester Shea, ? Rygg, Willis Ward, Tom Austin, Chuck Bernard, Francis Wistert, Donald McGuire, Harvey Chapman, Willard Hildebrand, John Viergiver, Russell Fuog, Wallace Frankowski, Fred Petoskey, Roy Semeyn, Robert Swanson, Gerald Ford

Middle Row: captain Stan Fay, William Renner, Henry Raymond, Hilton Ponto, Robert Wells, James Kidston, John Kowalik, Russ Oliver, Oscar Singer, Carl Savage, Chester Beard, John Regeczi, Herbert Schmidt, William Borgmann, Steve Remias

Front Row: George Rudness, Estel Tessmer, Lee Shaw, Louis Westover, Arthur Patchin, Lawrence Ratterman, Richard James, David Hunn, Eli Soodik, George Bolas, Antone Dauksza, Winfred Nelson, Herbert Paulson, Howard Triplehorn, D. King Lewis, ? Hall

University of Michigan Football Team, 1934, full squad posed on practice field

Back Row: Cedric Sweet, Franklin Lett, Steve Remias, Carl Carr, Russ Oliver, captain Thomas Austin, Robert Johnson, Willard Hildebrandt, Edward Stone, Michael Savage, Thomas Oyler, Harry Wright, Joe Fisher, Jack Liffiton, John Viergever, Herman Everhardus, Willis Ward, Matt Patanelli, Robert Graper

Middle Row: John Mumford, James Kidston, William Borgmann, Chester Beard, Howard Triplehorn, Vincent Pope, Ernest Pederson, Joseph Ellis, Robert Amrine, Russell Fuog, Stanton Schuman, Vincent Aug, Winfred Nelson, John Regeczi

Front Row: John Connolly, Jesse Garber, David Barnett, John Rieck, Frank Bissell, Eli Soodik, William Renner, Richard James, Ferris Jennings, Harry Pillinger, Harry Lutomski, George Bolas, Charles Brandman, Gerald Ford

University of Michigan Football Team, 1934, full squad posed on practice field

Back Row: Cedric Sweet, Franklin Lett, Steve Remias, Carl Carr, Russ Oliver, captain Thomas Austin, Robert Johnson, Willard Hildebrandt, Edward Stone, Michael Savage, Thomas Oyler, Harry Wright, Joe Fisher, Jack Liffiton, John Viergever, Herman Everhardus, Willis Ward, Matt Patanelli, Robert Graper

Middle Row: John Mumford, James Kidston, William Borgmann, Chester Beard, Howard Triplehorn, Vincent Pope, Ernest Pederson, Joseph Ellis, Robert Amrine, Russell Fuog, Stanton Schuman, Vincent Aug, Winfred Nelson, John Regeczi

Front Row: John Connolly, Jesse Garber, David Barnett, John Rieck, Frank Bissell, Eli Soodik, William Renner, Richard James, Ferris Jennings, Harry Pillinger, Harry Lutomski, George Bolas, Charles Brandman, Gerald Ford

Estudo de um compósito Nb-15%pCu obtidos por moagem de alta energia e sinterizados por fase líquida

There is great difficulty in forming a composite refractory metal niobium with copper. This is due to the fact that Nb-Cu system is almost mutually immiscible and may be neglected solubility between them. These properties hinder or prevent obtaining homogeneous and high-density structures, conventionally prepared. This study aims to analyze the use of high-energy milling process (MAE) to implement these natural difficulties, with regard to the densification of the sintered bodies. The MAE and the press were used in the preparation of powders, to obtain a fine and homogeneous distribution of the grain size. Four loads Nb and Cu powders containing 15% by weight of Cu were then milled for MAE in a planetary type ball mill under various milling times and speeds. The results obtained by MAE were analyzed by scanning electron microscopy (SEM), according to the parameters of time and grinding speed. The samples were compacted under pressure of 200 MPa, were then sintered in liquid phase in a vacuum furnace at temperatures of 1100 ° C / 60 min and 1200 ° C / 60 min. Then it was used to characterize diffraction of X-rays to identify the phases. The microstructures of the sintered samples were observed and evaluated using scanning electron microscopy (SEM). Vickers Microhardness tests were performed, obtaining higher values for the sintered bodies in the largest of the post milling times and the larger grinding speeds. It was found that the liquid phase sintering of the samples that were processed by MAE produced at the end of a homogeneous and densified structure in 77,4% relative to the value of the theoretical density of the composite

Efeito da moagem de alta energia na densificação e microestrutura do compósito AI2O3-Cu

The Cu-Al2O3 composite ceramic combines the phase of alumina, which is extremely hard and durable, yet very brittle, to metallic copper phase high ductility and high fracture toughness. These characteristics make this material a strong candidate for use as a cutting tool. Al2O3-Cu composite powders nanocrystalline and high homogeneity can be produced by high energy milling, as well as dense and better mechanical structures can be obtained by liquid phase sintering. This work investigates the effect of high-energy milling the dispersion phase Al2O3, Cu, and the influence of the content of Cu in the formation of Cu-Al2O3 composite particles. A planetary mill Pulverisatte 7 high energy was used to perform the experiments grinding. Al2O3 powder and Cu in the proportion of 5, 10 and 15% by weight of Cu were placed in a container for grinding with balls of hard metal and ethyl alcohol. A mass ratio of balls to powder of 1:5 was used. All powders were milled to 100 hours, and powder samples were collected after 2, 10, 20, 50 and 70 hours of grinding. Composite powders with compact cylindrical shape of 8 mm diameter were pressed and sintered in uniaxial matrix resistive furnace to 1200, 1300 to 1350 °C for 60 minutes under an atmosphere of argon and hydrogen. The heating rate used was 10°C/min. The powders and structures of the sintered bodies were characterized by XRD, SEM and EDS. Analysis TG, DSC and particle size were also used to characterize the milled powders, as well as dilatometry was used to observe the contraction of the sintered bodies. The density of the green and sintered bodies was measured using the geometric method (mass / volume). Vickers microhardness with a load of 500 g for 10 s were performed on sintered structures. The Cu-Al2O3 composite with 5% copper density reached 61% of theoretical density and a hardness of 129 HV when sintered at 1300 ° C for 1h. In contrast, lower densities (59 and 51% of the theoretical density) and hardness (110 HV and 105) were achieved when the copper content increases to 10 and 15%.

Benthic organic carbon flux and oxygen penetration depth in the Southern Ocean

For the investigation of organic carbon fluxes reaching the seafloor, oxygen microprofiles were measured at 145 sites in different sub-regions of the Southern Ocean. At eleven sites, an in situ oxygen microprofiler was deployed for the measurement of oxygen profiles and the calculation of organic carbon fluxes. At four sites, both in situ and ex situ data were determined for high latitudes. Based on this dataset as well as on previous published data, a relationship was established for the estimation of fluxes derived by ex situ measured O2 profiles. The fluxes of labile organic matter range from 0.5 to 37.1 mgC m**2/day. The high values determined by in situ measurements were observed in the Polar Front region (water depth of more than 4290 m) and are comparable to organic matter fluxes observed for high-productivity, upwelling areas like off West Africa. The oxygen penetration depth, which reflects the long-term organic matter flux to the sediment, was correlated with assemblages of key diatom species. In the Scotia Sea (~3000 m water depth), oxygen penetration depths of less than 15 cm were observed, indicating high benthic organic carbon fluxes. In contrast, the oxic zone extends down to several decimeters in abyssal sediments of the Weddell Sea and the southeastern South Atlantic. The regional pattern of organic carbon fluxes derived from micro-sensor data suggest that episodic and seasonal sedimentation pulses are important for the carbon supply to the seafloor of the deep Southern Ocean.

“Refugee Voices,” New Social Media and Politics of Representation: Young Congolese in the Diaspora and Beyond

This article examines the role of new social media in the articulation and representation of the refugee and diasporic “voice.” The article problematizes the individualist, de-politicized, de-contextualized, and aestheticized representation of refugee/diasporic voices. It argues that new social media enable refugees and diaspora members to exercise agency in managing the creation, production, and dissemination of their voices and to engage in hybrid (on- and offline) activism. These new territories for self-representation challenge our conventional understanding of refugee/diaspora voices. The article is based on research with young Congolese living in the diaspora, and it describes the Geno-cost project created by the Congolese Action Youth Platform (CAYP) and JJ Bola’s spoken-word piece, “Refuge.” The first shows agency in the creation of analytical and activist voices that promote counter-hegemonic narratives of violence in the eastern Democratic Republic of Congo, while the second is an example of aesthetic expressions performed online and offline that reveal agency through authorship and ownership of one’s voice. The examples highlight the role that new social media play in challenging mainstream politics of representation of refugee/diaspora voices.

Desenvolvimento de um cerâmico Al2O3/TI(C,N) para uso em maquinação

O principal objetivo deste trabalho é preparar um cermeto do tipo Al2O3/Ti(C,N) com propriedades mecânicas adequadas à sua utilização na maquinação de materiais do tipo DIN ISO 513:K01-K10 e ISO H01-H10. De forma a incrementar a sinterabilidade do cermeto investigou-se o efeito da adição de dopantes metálicos, nomeadamente alumínio metálico (Al) e hidreto de titânio (TiH2) e o efeito da substituição da moagem convencional por moagem de alta energia. As variáveis das etapas principais de processamento, i.e., da moagem, prensagem e sinterização, foram selecionadas com trabalho realizado quer na Universidade de Aveiro quer na empresa Palbit. Foram preparadas três composições do cermeto Al2O3/Ti(C,N) com adições de 5%TiH2, 1%Al e 5%TiH21%Al através da moagem de alta energia. Os parâmetros de moagem, i.e. a velocidade de rotação, o rácio bolas/pó e o tempo de moagem foram otimizados para os seguintes valores: 350 rpm, 10:1 e 5 h, respetivamente. A utilização da moagem de alta energia permitiu uma redução do tamanho de partícula dos pós até aproximadamente 100 nm e a obtenção de uma boa uniformidade da distribuição das fases (Al2O3+Ti(C,N)). A etapa de conformação foi efetuada por prensagem uniaxial seguida de prensagem isostática. A avaliação da reatividade dos cermetos através de dilatometria em atmosfera de vácuo revelou que a densificação é maioritariamente realizada em estado sólido. A adição de apenas 1%Al é a menos efetiva para a densificação. Os cermetos foram sinterizados através de sinterização convencional em forno de vazio a 1650ºC e prensagem a quente (1650ºC com uma pressão uniaxial de 25 MPa). Os valores de densificação obtidos, aproximadamente 80% e 100%, respetivamente, indicam que a aplicação de pressão durante a sinterização é efetiva para atingir densificações elevadas nos compactos, compatíveis com as suas aplicações tecnológicas. As propriedades mecânicas de dureza e de tenacidade avaliadas nos três cermetos apresentaram valores aproximados de 1800-1900 HV50 para a dureza e entre 5.4 e 7.7 MPa.m1/2 para a tenacidade à fratura.

Práticas de ensino supervisionada e a importância da creche na transição para o Jardim-de-Infância

O presente Relatório Final de Estágio foi desenvolvido no âmbito da unidade curricular de Prática de Ensino Supervisionada III (PES III) do 2.º Ciclo de Estudos, do Mestrado em Educação Pré-Escolar e Ensino do 1.º Ciclo do Ensino Básico e inclui duas partes distintas. A primeira parte diz respeito às práticas de estágio desenvolvidas no decorrer da unidade curricular Prática de Ensino Supervisionada (PES). Aí, proceder-se-á a uma reflexão crítica acerca do trabalho desenvolvido nos referidos contextos e das experiências de aprendizagem que daí resultaram. A segunda parte do relatório final de estágio está relacionada com a execução de um trabalho de investigação centrado nos seguintes objetivos: compreender a importância da frequência da creche no desenvolvimento e aprendizagem das crianças, identificar a opinião dos profissionais sobre a creche e as suas atividades e conhecer a relação pais/Jardim-de-Infância/Creche. O estudo em causa segue uma metodologia qualitativa, mais concretamente o estudo de caso e envolve duas educadoras de creche, três educadoras do jardim-de-infância, nove pais das crianças da creche e sessenta e uma crianças (9 responderam às entrevistas acerca da frequência da creche e 52 executaram o desenho alusivo à visita à sala de creche). Com a realização deste trabalho de investigação pretende-se acima de tudo obter resposta à seguinte questão: “Qual a importância da frequência da Creche na transição para o Jardim-de-Infância?” Tendo em conta o estudo realizado foi possível obter determinadas conclusões de acordo com as perpetivas dos profissionais (educadoras de creche e educadoras do jardim-de-infância), pais e crianças do jardim-de-infância. No parecer dos profissionais a creche é importante no sentido de autonomia (gerir a separação dos pais), em termos de regras, altruísmo e partilha de brinquedos, bem como o desenvolvimento global das crianças. Os pais consideram que a creche proporciona o desenvolvimento pessoal e aprendizagem das crianças. Para além disto, a mesma permite educar os seus filhos e é a primeira etapa da educação escolar. Porém, existem pais que referem que o facto de deixarem os seus filhos na referida instituição está relacionado com a inexistência de tempo da sua parte.De acordo com as entrevistas realizadas às crianças do jardim-de-infância podemos verificar que a frequência da creche foi fundamental para o crescimento saudável das crianças, sendo que 89% das crianças têm lembranças positivas sobre o primeiro dia de creche, 57% das crianças menciona como atividades que mais gostavam brincar com as bolas, 100% mencionaram que preferem brincar com outras crianças, 78% revelaram a existência de uma interação positiva entre as mesmas e a educadora, bem como 100% afirmou existir reações positivas à participação dos pais nas suas atividades.

Caracterização de compósitos Nb-20%cu obtidos por moagem de alta energia e sinterizados por fase líquida

In this work, was studied the formation of a composite of the refractory metal niobium with copper, through the process of high-energy milling and liquid phase sintering. The HEM can be used to synthesize composite powders with high homogeneity and fine size particle distribution. It may also produce the solid solubility in immiscible systems such as Nb-Cu, or extend the solubility of systems with limited solubility. Therefore, in the immiscible system Cu-Nb, the high-energy milling was successfully used to obtain the composite powder particles. Initially, the formation of composite particles during the HEM and the effect of preparation technique on the microstructure of the material was evaluated. Four loads of Nb and Cu powders containing 20%wt Cu were synthesized by MAE in a planetary type ball mill under different periods of grinding. The influence of grinding time on the metal particles is evaluated during the process by the withdrawal of samples at intermediate times of milling. After compaction under different forces, the samples were sintered in a vacuum furnace. The liquid phase sintering of these samples prepared by HEM produced a homogeneous and fine grained. The composite particles forming the sintered samples are the addition of a hard phase (Nb) with a high melting point, and a ductile phase (Cu) with low melting point and high thermal and electrical conductivities. Based on these properties, the Nb-Cu system is a potential material for many applications, such as electrical contacts, welding electrodes, coils for generating high magnetic fields, heat sinks and microwave absorbers, which are coupled to electronic devices. The characterization techniques used in this study, were laser granulometry, used to evaluate the homogeneity and particle size, and the X-ray diffraction, in the phase identification and to analyze the crystalline structure of the powders during milling. The morphology and dispersion of the phases in the composite powder particles, as well the microstructures of the sintered samples, were observed by scanning electron microscopy (SEM). Subsequently, the sintered samples are evaluated for density and densification. And finally, they were characterized by techniques of measuring the electrical conductivity and microhardness, whose properties are analyzed as a function of the parameters for obtaining the composite

Intelligent system for interaction with virtual characters based on volumetric sensors

Dissertação de Mestrado, Engenharia Elétrica e Eletrónica, Instituto Superior de Engenharia, Universidade do Algarve, 2015

Photovoltaic power forecast modeling with artificial neural networks

Dissertação de Mestrado, Engenharia Eletrónica e Telecomunicações, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016

Desenvolvimento e caracterização de um compósito matriz metálica (CMM): aço EUROFER97 reforçado com Carbeto de Tântalo - TaC

Steel is an alloy EUROFER promising for use in nuclear reactors, or in applications where the material is subjected to temperatures up to 550 ° C due to their lower creep resistance under. One way to increase this property, so that the steel work at higher temperatures it is necessary to prevent sliding of its grain boundaries. Factors that influence this slip contours are the morphology of the grains, the angle and speed of the grain boundaries. This speed can be decreased in the presence of a dispersed phase in the material, provided it is fine and homogeneously distributed. In this context, this paper presents the development of a new material metal matrix composite (MMC) which has as starting materials as stainless steel EUROFER 97, and two different kinds of tantalum carbide - TaC, one with average crystallite sizes 13.78 nm synthesized in UFRN and another with 40.66 nm supplied by Aldrich. In order to improve the mechanical properties of metal matrix was added by powder metallurgy, nano-sized particles of the two types of TaC. This paper discusses the effect of dispersion of carbides in the microstructure of sintered parts. Pure steel powders with the addition of 3% TaC UFRN and 3% TaC commercial respectively, were ground in grinding times following: a) 5 hours in the planetary mill for all post b) 8 hours of grinding in the mill Planetary only for steel TaC powders of commercial and c) 24 hours in the conventional ball mill mixing the pure steel milled for 5 hours in the planetary mill with 3% TaC commercial. Each of the resulting particulate samples were cold compacted under a uniaxial pressure of 600MPa, on a cylindrical matrix of 5 mm diameter. Subsequently, the compressed were sintered in a vacuum furnace at temperatures of 1150 to 1250 ° C with an increment of 20 ° C and 10 ° C per minute and maintained at these isotherms for 30, 60 and 120 minutes and cooled to room temperature. The distribution, size and dispersion of steel and composite particles were determined by x-ray diffraction, scanning electron microscopy followed by chemical analysis (EDS). The structures of the sintered bodies were observed by optical microscopy and scanning electron accompanied by EDS beyond the x-ray diffraction. Initial studies sintering the obtained steel EUROFER 97 a positive reply in relation to improvement of the mechanical properties independent of the processing, because it is obtained with sintered microhardness values close to and even greater than 100% of the value obtained for the HV 333.2 pure steel as received in the form of a bar

Synthesis and characterization of low-cost materials for aqueous Na-ion batteries

136 p.