Uso da plataforma Arduıno no Apoio ao Ensino de Arquitetura de Computadores

Integrar teoria a prática em sala de aula é um desafio. Durante o processo de aprendizado, é observado que o ensino dos conceitos ignora a prática, impedindo a reflexão, o questionamento e o uso dos conceitos aprendidos. Este artigo apresenta um experimento que vincula teoria e prática no ensino das disciplinas de Sistemas Operacionais e Arquitetura de Computadores através de experimentos com Arduino. Busca-se desenvolver as habilidades dos estudantes, permitindo que eles modelem, analisem, gerenciem e implantem projetos de software. Ensinar por esta perspectiva é um desafio em frente a complexidade e multidisciplinaridade envolvendo tais eixos. Espera-se que os estudantes atinjam tanto um melhor desempenho nos objetivos do curso quanto um melhor aprendizado dos conceitos essenciais para sua formação profissional. Entre os resultados obtidos ressaltam-se o aumento na participação, motivação e engajamento bem como um aprendizado mais completo e efetivo. 

Proposta de Ferramenta Open Source para Gerenciamento de Trabalho de Conclusão de Curso

O Trabalho de Conclusão de Curso (TCC) constitui-se em uma rica fonte de experiências e conhecimento que proporciona ao acadêmico a oportunidade de desenvolver um trabalho teórico-prático relacionado `a utilização dos conhecimentos adquiridos no curso. De modo a otimizar os aprendizados obtidos pelo acadêmico, a pesquisa deve ser conduzida de forma planejada, controlada e sequencial, necessitando para tal, a adoção de ferramentas computacionais de gerenciamento de projetos. Este trabalho apresenta uma proposta de utilização da ferramenta Redmine no gerenciamento de TCCs. A ferramenta de gerenciamento apresentada permitiu a definição de tarefas a serem realizadas pelo acadêmico ao longo das várias fases da pesquisa, a criação e o acompanhamento do cronograma de atividades, o acompanhamento das entregas realizadas, bem como a visualização da evolução da pesquisa tanto pelo acadêmico quanto por todos os demais envolvidos ao longo do projeto

Role of Composition and Size of Cobalt Ferrite Nanocrystals in the Oxygen Evolution Reaction

Sub-10 nm CoFe2O4 nanoparticles with different sizes and various compositions obtained by (partial) substitution of Co with Ni cations have been synthesized by using a one-pot method from organic solutions by the decomposition of metal acetylacetonates in the presence of oleylamine. The electrocatalytic activity of CoFe2O4 towards the oxygen evolution reaction (OER) is clearly enhanced with a smaller size (3.1 nm) of the CoFe2O4 nanoparticles (compared with 4.5 and 5.9 nm). In addition, the catalytic activity is improved by partial substitution of Co with Ni, which also leads to a higher degree of inversion of the spinel structure. Theoretical calculations attribute the positive catalytic effect of Ni owing to the lower binding energy differences between adsorbed O and OH compared with pure cobalt or nickel ferrites, resulting in higher OER activity. Co0.5Ni0.5Fe2O4 exhibited a low overpotential of approximately 340 mV at 10 mAcm-2, a smaller Tafel slope of 51 mVdec-1, and stability over 30 h. The unique tunability of these CoFe2O4 nanocrystals provides great potential for their application as an efficient and competitive anode material in the field of electrochemical water splitting as well as for systematic fundamental studies aiming at understanding the correlation of composition and structure with performance in electrocatalysis

99mTc-2-Methoxy-Isobutyl-Isonitril in der Diagnostik der koronaren Herzkrankheit: Ergebnisse einer Multizenterstudie. [99mTc-2-methoxy-isobutyl-isonitrile in the diagnosis of coronary heart disease: results of a multicenter study]

A total of 226 patients was studied in a phase-III multicenter trial to compare the results of stress/rest 99mTc-MIBI with 201TI scintigraphy and/or coronary arteriography. The evaluation of planar and SPECT imaging was based on a semiquantitative visual scoring. A congruent diagnosis was generated from all planar 201TI and 99mTc-MIBI scintigrams performed in 36 patients. In 62 of 63 patients, SPECT-studies with 99mTc-MIBI and 201TI led to an identical diagnosis. In one patient a positive result was obtained with 201TI-SPECT whereas 99mTc-MIBI was negative. Segmental agreement for 1509 SPECT segments was 85.7%, for 554 planar segments it was 86.6%. In comparison to coronary arteriography, performed in 180 patients, the overall sensitivity for the correct diagnosis of coronary artery disease (CAD) was 86% for planar MIBI scintigraphy or 92% for MIBI-SPECT. Overall specificity was 100% for planar imaging and 57% for SPECT. The low specificity of MIBI-SPECT was probably due to high prevalence of CAD in this study population. In a subgroup of 43 patients, who underwent coronary angiography, identical results were found with 99mTc-MIBI and 201TI. Only one patient showed a positive scintigraphic result with both 99mTc-MIBI and 201TI without angiographically proven stenosis greater than 50% or prior myocardial infarction. Vessel sensitivities in stenosed coronary arteries (greater than 50% stenosis) were 54% for the LAD and 87% for the RCX/RCA areas with MIBI-SPECT, or 51% or 79% for planar scintigraphy, respectively. Vessel specificities for SPECT were 65% in the LAD or 52% in the RCX/RCA, or 90% or 83% in planar imaging.(ABSTRACT TRUNCATED AT 250 WORDS