27 documents found, page 1 of 3
On the microstructural anisotropy and mechanical properties of bacterial nanoce...
Costa, Lígia; Carvalho, Alexandre F.; Fernandes, António J. S.; Campos, Teresa; Dourado, Nuno; Rodrigues, Ana Cristina; Sampaio, PaulaThe microstructural organization of bacterial nanocellulose is still not completely understood. Although its morphological and mechanical anisotropy is commonly recognized, it remains unclear whether the forces stabilizing the cellulose fiber network are comparable in different planes. In this study, we characterized the microstructure of statically produced BNC according to its horizontal and vertical planes. ...
Bacterial nanocellulose as a simple and tailorable platform for controlled drug...
Costa, Lígia Francisca Rodrigues; Carvalho, Alexandre; Fernandes, António J. S.; Campos, Teresa; Dourado, Nuno; Costa, Florinda M.; Gama, F. M.In this study we present a proof of concept of a simple and straightforward approach for the development of a Bacterial Nanocellulose drug delivery system (BNC-DDS), envisioning the local delivery of immunomodulatory drugs to prevent foreign body reaction (FBR). Inspired by the self-adhesion behavior of BNC upon drying, we proposed a BNC laminate entrapping commercial crystalline drugs (dexamethasone-DEX and GW...
Dorsal Hump Reduction Based on the New Ethmoidal Point Classification: A Clinic...
Ferreira, Miguel; Dias, David Rodrigues; Cardoso, Luis; Santos, Mariline; Sousa, Cecília A; Dourado, Nuno; Santos, Jorge; Amarante, JoséBackground: Hump resection often requires reorganization of the keystone area. Objectives: The authors sought to describe the importance of the point where the perpendicular plate of ethmoid joins the septal cartilage (SC) and the nasal bones (NB) (Ethmoidal point [E-point]) for hump resection surgical planning. Methods: Measurements from mid-sagittal slices in nasal computed tomography scans taken in adult Cau...
T.01 - Sistemas de transmissão de movimento
Flores, Paulo; Gomes, José Manuel Ramos; Dourado, Nuno; Marques, Pedro Filipe LimaNeste documento apresentam-se os principais sistemas de transmissão de movimento lecionados no âmbito da unidade curricular Órgãos de Máquinas II, do curso de Mestrado Integrado em Engenharia Mecânica da Universidade do Minho. Assim, após uma breve introdução às transmissões mecânicas, faz-se a distinção entre os diferentes tipos de sistemas de transmissão de movimento. Depois é feita uma análise descritiva das...
A study on the dynamics of a study on the dynamics of spatial mechanisms with f...
Marques, Pedro Filipe Lima; Isaac, Fernando; Dourado, Nuno; Souto, A. Pedro; Flores, Paulo; Lankarani, Hamid M.An investigation on the dynamic modeling and analysis of spatial mechanisms with spherical clearance joints including friction is presented. For this purpose, the ball and the socket which compose a spherical joint are modeled as two individual colliding components. The normal contact-impact forces that develop at the spherical clearance joint are determined by using a continuous force model. A continuous analy...
T.04 – Aspetos gerais sobre engrenagens
Flores, Paulo; Gomes, José Manuel Ramos; Dourado, Nuno; Marques, Pedro Filipe LimaNeste documento são apresentados os aspetos gerais relativos à temática das engrenagens, a qual é lecionada no âmbito da unidade curricular Órgãos de Máquinas II, do curso de Mestrado Integrado em Engenharia Mecânica da Universidade do Minho. Com efeito, inicia-se este assunto com uma breve introdução, após a qual se faz uma breve muito resenha histórica sobre as engrenagens. De seguida apresentam-se os princip...
T.08 - Engrenagens de parafuso sem-fim
Flores, Paulo; Gomes, J. R.; Dourado, Nuno; Marques, Pedro Filipe LimaNeste documento aborda-se o tema das engrenagens de parafuso sem-fim, o qual é lecionado no âmbito da unidade curricular Órgãos de Máquinas II, do curso de Mestrado Integrado em Engenharia Mecânica da Universidade do Minho. Com efeito, inicia-se este assunto com uma breve introdução, após a qual se apresenta o estudo relativo à geração do dente. Seguidamente faz-se uma breve referência aos perfis dos filetes de...
Undergraduates’ views of assessment in higher education: a study carried out in...
Santos, Patricia; Pereira, Diana; Mesquita, Diana; Flores, Paulo; Pereira, Rui; Dourado, Nuno; Flores, Maria AssunçãoThis paper looks at how undergraduates look at assessment in Higher Education. It focuses on their views about assessment practices in five Portuguese public universities. The main purpose is to look at the students’ perceptions of assessment in higher education taking into account the assessment methods used, the influence of assessment in their motivation to learn as well as self-regulation of the learning pr...
Fracture behavior in geopolymer mixtures including fly ash and various industri...
Brito, José Júlio; Dourado, Nuno; Teixeira, Tiago Joaquim da Costa; Abreu, Miguel Augusto Freitas; Pinho, A. C. Marques de; Castro, FernandoThe fracture resistance behavior of fly ash based geopolymer mixtures incorporating different types of industrial wastes has been investigated. Therefore, 4 different geopolymer mixtures were analyzed, with the intent to retrieve information about their Initial Flexural Stiffness (Ri), and Ultimate Load (Pu). A result analysis revealed that one type of mixture was considerably superior to the rest in terms of I...
An enhanced formulation to model spatial revolute joints with radial and axial ...
Marques, Filipe; Isaac, Fernando; Dourado, Nuno; Flores, PauloThe primary objective of this work is to present a new formulation to model spatial revolute joints with radial and axial clearances. The methodology developed is based on the relative motion between the journal and bearing elements, which accounts for all the possible contact scenarios within a revolute clearance joint. In this process, normal and tangential contact force models are reexamined to evaluate thei...