Encontrados 14 documentos, a visualizar página 1 de 2
Novel two-step processing route combining mechanical alloying and microwave hyb...
Santos, Mário J. G.; Alves, Cátia; Oliveira, F. A. Costa; Marcelo, Teresa; Mascarenhas, João; Cavaleiro, A.; Trindade, B.In this work, microwave hybrid sintering at 1300 and 1350 °C was carried out for densification of La9.33Si2Ge4O26 mechanically alloyed powder with apatite structure. The pellets sintered at these two temperatures present the same structure (apatite) with relative densities of 92 and 96%, respectively. Mechanical analysis performed on sintered materials revealed the following results: hardness of 7.1 and 8.0 GPa...
Effect of the sintering conditions on the morphology of La9.33Si2Ge4O26 oxyapat...
Macatrão, Mafalda; Santos, Mário J. G.; Alves, Cátia; Oliveira, F. A. Costa; Marcelo, Teresa; Mascarenhas, João; Trindade, B.Solid oxide fuel cells (SOFCs) are devices that allow direct conversion of chemical to electrical energy through an electrochemical reaction in a cleaner and more efficient way than conventional processes (eg. gas turbines). They are characterized by the use of a solid oxide material as the electrolyte. Yttria-stabilised zirconia (YSZ) has traditionally been used in SOFCs electrolytes at temperatures in the ra...
Segmentation of Female Pelvic Organs in Axial Magnetic Resonance Images using C...
Zhen Ma; Renato Natal M. Jorge; Teresa Mascarenhas; João Manuel R.S. TavaresThe segmentation of pelvic structures in magnetic resonance (MR) images of the female pelvic cavity is a challenging task. This paper proposes the use of three novel geometric deformable models to segment the bladder, vagina and rectum in axial MR images. The different imaging appearances and prior shape knowledge are combined into a level set framework as segmentation cues. The movements of the contours are co...
Synthesis and thermal behavior of La9.33Si2Ge4O26 apatite for SOFCs
Serra, R.; Alves, Cátia; Oliveira, J.C.; Oliveira, F. A. Costa; Marcelo, Teresa; Mascarenhas, João; Trindade, B.Powders of La2O3, GeO2 and SiO2 were dry milled in a planetary ball mill with different rotation speeds (150–350 rpm) and increasing milling times up to 35 h in order to obtain the La9.33Si2Ge4O26 apatite phase at room temperature. The results showed that the higher the rotation speed the lower the time required for the formation of the apatite phase. No reaction between the starting powders was observed at 150...
Mechanical properties of sintered La9.33Si2Ge4O26 oxyapatite materials for SOFC...
Santos, Miguel; Alves, Cátia; Oliveira, F. A. Costa; Marcelo, Teresa; Mascarenhas, João; Fernandes, J.V.; Trindade, B.Mechanical properties of La9.33Si2Ge4O26 prepared by mechanical alloying and subsequent sintering at 1300–1400 °C for 1 h were evaluated. Hardness and Young's modulus values in the range 7.3–9.6 GPa and 106–135 GPa, respectively, were obtained from nanohardness tests. The fracture toughness values derived from the Palmqvist method varied between 3.5 and 3.9 MPa m1/2 from classical microindentation test with an ...
The fourth dimension in landscape analysis: changing of heritage and ecological...
Batista, Teresa; Mascarenhas, José Manuel de; Mendes, PaulaTime is one of the most important driving forces in Landscape Ecology. Time along with geosystem, biosystem and socialsystem determines landscape heterogeneity which reveals itself in different patterns and functions. Cultural Landscapes are the result of the interactions between man and environment along time.
A solidão na gravidez : determinantes da solidão e seu impacto na ligação mater...
Pinto, Maria Teresa MascarenhasRESUMO - O sentimento de solidão tem vindo a tornar-se cada vez mais frequente entre os indivíduos, fruto do desenvolvimento da sociedade moderna. Especificamente, ocorrendo durante a gravidez, situação que produz na mulher importantes alterações não só físicas, como também psicológicas, familiares e sociais, deve passar a ser alvo de uma atenção especial. De um ponto de vista da Saúde Mental, o desenvolvimento...
Heritage landscapes in Évora surroundings: a GIS approach
Batista, Teresa; Mascarenhas, José Manuel de; Mendes, Paula; Mantas, VascoÉvora (the Lusitanian Ebora), the most important town in Alentejo province (Southern Portugal) is involved by a cultural landscape where not only archeological sites and old built structures (walls, roads, bridges houses, etc.) of several epochs are present, but also old parcel networks and specific agro forestry pastoral systems, the montados, exist. In front of a so big quantity of data, the authors have sel...
3D Models of Pelvic Floor Muscles Developed by Manual Segmentation to FEM
Cristina S Saleme; Renato N Jorge; Marcos P Barbosa; Marco Parente; Agnaldo L S Filho; Thuane Roza; João Manuel RS Tavares; Teresa MascarenhasThe female pelvic floor is an understudied region of the body from the biomechanical perspective. MRI has been used in the diagnostic evaluation of the pelvic floor dysfunctions. Static images show their morphology while dynamic images show the functional changes that occur on straining and contraction of the pelvic floor. In the present work, MR images contribute to generate 3D solids of pelvic floor muscles t...
Comparative study of pelvic floor displacement in a woman with stress urinary i...
Cristina Saleme; Thuane Roza; Teresa Mascarenhas; Joana Loureiro; Marco Paulo Lages Parente; Renato Manuel Natal Jorge; Marcos Pinotti; Agnaldo FilhoMRI has been used in the diagnostic evaluation of the pelvic floor dysfunctions. Static images show their morphology while dynamic images show the functional changes that occur on straining and contraction of the levator ani. With dynamic images, displacement of organs and pelvic floor muscles can be computed in three planes (axial, sagital and coronal) [1]. The purpose of this study is to compare pelvic floor ...
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