6 documents found, page 1 of 1
Smart carbon fiber-reinforced polymer composites for damage sensing and on-line...
Lopes, Cláudia Jesus Ribeiro; Araújo, Andreia; Silva, Fernando; Pappas, Panagiotis-Nektarios; Termine, Stefania; Trompeta, Aikaterini-Flora A.High electrical conductivity, along with high piezoresistive sensitivity and stretchability, are crucial for designing and developing nanocomposite strain sensors for damage sensing and on-line structural health monitoring of smart carbon fiber-reinforced polymer (CFRP) composites. In this study, the influence of the geometric features and loadings of carbon-based nanomaterials, including reduced graphene oxide...
Optimization of the system of allocation of overdue loans in a sub-saharan Afri...
Araújo, Andreia; Portela, Filipe; Alvelos, Filipe Pereira e; Ruiz, SauloIn microfinance, with more loans, there is a high risk of increasing overdue loans by overloading the resources available to take actions on the repayment. So, three experiments were conducted to search for a distribution of the loans through the officers available to maximize the probability of recovery. Firstly, the relation between the loan and some characteristics of the officers was analyzed. The results w...
Allocation of overdue loans in a sub-saharan Africa microfinance institution
Araújo, Andreia; Portela, Filipe; Alvelos, Filipe Pereira e; Ruiz, SauloMicrofinance is one strategy followed to provide opportunities to different economic classes of a country. With more loans, there is a high risk of increasing the loans entering the overdue stage, overloading the resources available to take action on the repayment. In this paper, it is only approached the experiment using clustering to the problem. This experiment was focus on a segmentation of the overdue loan...
Coin minting by additive manufacturing and forming
Pragana, João; Rosenthal, Stephan; Alexandrino, Paulo; Araújo, Andreia; Bragança, Ivo; Silva, Carlos; Leitão, Paulo J.; Tekkaya, A. ErmanAdditive manufacturing is proposed as a novel alternative to coin blank's production routes based on rolling, blanking and edge rimming. The presentation draws from laser powder bed fusion of cylinders, slicing into individual coin blanks by electro discharge machining and surface preparation by polishing, to coin minting in a laboratory press-tool system. Special emphasis is given to material deposition and co...
The role of shear and stabilizer on PLA degradation
Oliveira, Manuel; Santos, Elsa; Araújo, Andreia; Fechine, Guilhermino J. M.; Machado, Ana V.; Botelho, GabrielaThe role of temperature, shear and oxygen on PLA degradation was investigated. Thermo-mechanical degradation induces a larger decrease in PLA molecular weight than thermo-oxidative degradation. This was associated with different degradation processes (mainly chain scission) that took place under the two conditions. Given the PLA robustness to endure reprocessing, it was possible to conclude that the primary and...
A (des)motivação na atividade docente : perspetivas de docentes do ensino secun...
Araújo, Andreia; Seabra, FilipaOs problemas relativos à profissão docente constituem uma preocupação constante de todos os profissionais, pelo que, os agentes de (des)motivação e causadores de stress e mal-estar docente no trabalho são objecto de estudo, com importância reconhecida por diversos investigadores. Esta comunicação reporta parcialmente resultados de uma dissertação de mestrado em curso, cujo objectivo é conhecer alguns dos factor...