181.
Análise de Tensões em Placas, Cascas e Reservatórios - J.F. Silva Gomes
Placas e Cascas são elementos estruturais de utilização frequente nas mais diversas áreas tecnológicas de engenharia civil, mecânica, química, naval, aeronáutica e aeroespacial. Pelas suas propriedades intrínsecas de leveza e resistência, são utilizadas na construção de pontes, coberturas de pavilhões industriais e grandes superfícies, aeronaves, veículos aeroespaciais e muitos outros tipos de equipamentos onde o reduzido peso da estrutura é essencial.
O livro está escrito duma forma simples e acessível, apresentando as matérias numa sequência natural, partindo dos conceitos básicos mais rigorosos e evoluindo depois para aproximações simplificativas mais facilmente manuseáveis, sempre que as dificuldades no tratamento analítico das equações resultantes...
185.
Computer Techniques Towards the Automatic Characterization of Graphite Particles in Metallographic Images of Industrial Materials - João P. Papa; Rodrigo Y. M. Nakamura; Victor Hugo C. de Albuquerque; Alexandre X. Falcão; João Manuel R. S. Tavares
The automatic characterization of particles in metallographic images has been paramount, mainly because of the importance of quantifying such microstructures in order to assess the mechanical properties of materials common used in industry. This automated characterization may avoid problems related with fatigue and possible measurement errors. In this paper, computer techniques are used and assessed towards the accomplishment of this crucial industrial goal in an efficient and robust manner. Hence, the use of the most actively pursued machine learning classification techniques. In particularity, Support Vector Machine, Bayesian and Optimum-Path Forest based classifiers, and also the Otsu’s method, which is commonly...
186.
Characterization of a CuAlBe alloy with different Cr contents - Gemierson Valois da M. Candido; Tadeu Antônio de A. Melo; Victor Hugo C. de Albuquerque; Rodinei Medeiros Gomes; Severino Jackson G. de Lima; João Manuel R. S. Tavares
In this paper, the use of chromium (Cr) as a grain refiner for a CuAlBe shape memory alloy is discussed. Alloys with 0.1, 0.2, 0.3 and 0.5 wt.% Cr were characterized by optical microscopy, scanning electron microscope and X-ray diffraction. Also, the influence of the different percentages of Cr on the grain size and on the mechanical properties was analyzed through macro and microscopic evaluations and by tensile and hardness tests, respectively. Finally, the phase transformation temperatures of the alloys were determined by thermal analysis using differential scanning calorimetry. The results showed that the higher the Cr content, the greater...
195.
A dedicated methodology for the development of new medical technologies - Isa C. T. Santos; G. Scott Gazelle; Luís A. Rocha; João Manuel R.S. Tavares
The scientific discoveries of the last century are responsible for most of the medical devices currently in use. In this century, considering the advances namely in the computational power and the diffusion of the internet, one can expect a revolution in the use of medical technologies. Most certainly, new products and services will appear but only the ones that are supported by solid business plans will thrive. To assist in the development of novel medical devices and services and the elaboration of convincing business plans, the use of a product development methodology dedicated to medical technologies is suggested in this...
181.
