5 documents found, page 1 of 1
Lambert W functions in the analysis of nonlinear dynamics and bifurcations of a...
Rocha, J. Leonel; Taha, Abdel-Kaddous; Abreu, StellaThe aim of this paper is to study the use of Lambert W functions in the analysis of nonlinear dynamics and bifurcations of a new two-dimensional -Ricker population model. Through the use of such transcendental functions, it is possible to study the fixed points and the respective eigenvalues of this exponential diffeomorphism as analytical expressions. Consequently, the maximum number of fixed points is proved,...
Interdisciplinary Team Work
Abreu, Stella; Caldeira, Amélia; Costa, Alexandra R.; Gomes, Tiago; Roque, Luis A.C.In this work, we describe an interdisciplinary teaching experiment involving three subjects of the scientific area of Mathematics and a fourth one in the area of Management. Using only one project, the students developed skills, in an integrated way, in the fields of the subjects involved. The structure of the project is described in detail. It is shown how the knowledge obtained in the different subjects is ne...
Picking optimization
Santos, Jorge; Lavado, Nuno; Abreu, Stella; Cruz, Manuel; Lopes, Isabel; Soares, João; Lopes, Isabel; Moura, AnaContinente's grocery e{commerce team prepares 300k orders/year. Each operator steers the trolley to select items to multiple cli- ents. For each order, a picker may have to walk on the shop up to 2500m. SONAE MC's Grocery ecommerce is below international best practice efficiencies in picking. Picking ine ciencies to be addressed include improving picking tasks to minimize distances. There's a very high level of...
Modelling drying process in paper manufacturing
Abreu, Stella; Araújo, Adérito; Barbeiro, Sílvia; Correia, Joaquim; Augusto Ferreira, José; Pena, Gonçalo; Morgado, Luísa; Penedones, JoãoEuroresinas produces different types of resin-impregnated paper at its factories. Along the manufacturing process, after the paper has been bathed in resin, it is subjected to a drying process which is a fundamental step in the process. Although the temperature is controlled by a heating system, the actual values inside the chain of dryers are only measured at a few points away from where the paper is. The comp...
Modelling drying process in paper manufacturing
Abreu, Stella; Araújo, Adérito; Barbeiro, Sílvia; Correia, Joaquim; Augusto Ferreira, José; Pena, Gonçalo; Morgado, Luísa; Penedones, JoãoEuroresinas produces different types of resin-impregnated paper at its factories. Along the manufacturing process, after the paper has been bathed in resin, it is subjected to a drying process which is a fundamental step in the process. Although the temperature is controlled by a heating system, the actual values inside the chain of dryers are only measured at a few points away from where the paper is. The comp...