16 documents found, page 1 of 2
Natural regeneration of cork oak forests under climate change: a case study in ...
Ribeiro, Stéphanie; Cerveira, Adelaide; Soares, Paula; Almeida Ribeiro, Nuno; Camilo-Alves, Constanca; Fonseca, TeresaThe sustainability of forest species is directly related to the success of stand regeneration. Assuring success is particularly critical in stands where perpetuity relies on natural regeneration, as is often the case with cork oak forests. However, 59% of the stand in Portugal have no natural regeneration, and climate change could further worsen the sustainability of the system. The study summarizes the factors...
Wind farm layout optimization under uncertainty
Agra, Agostinho; Cerveira, AdelaideWind power is a major source of green energy production. However, the energy generation of wind power is highly affected by uncertainty. Here, we consider the problem of designing the cable network that interconnects the turbines to the substation in wind farms, aiming to minimize both the infrastructure cost and the cost of the energy losses during the wind farm’s lifetime. Nonetheless, the energy losses depen...
Solving a harvest scheduling optimization problem with constraints on clearcut ...
Martins, Isabel; Alvelos, Filipe Pereira e; Cerveira, Adelaide; Kašpar, Jan; Marušák, RobertThis study aims at solving a harvesting scheduling optimization problem with constraints on the clearcut area with additional constraints on clearcut proximity. The objective function is defined as the net present value generated by harvesting discounted by a penalty for each clearcut. This problem arises to reduce the negative environmental impact of excessive harvesting. We propose the connected-bucket model,...
Impact of fire recurrence and induced water stress on seed germination and root...
Ribeiro, Stéphanie; Gaspar, Maria João; Lima-Brito, José; Fonseca, Teresa; Soares, Paula; Cerveira, Adelaide; Fernandes, Paulo M.Climate change will increase the frequency of drought, heat waves, and wildfires. We intended to analyse how fire recurrence and/or induced water stress can affect seed germination and root cell division in Pinus pinaster Aiton. Seeds from stands with no prior fire history and from post-fire regeneration (in areas burnt once, twice, and thrice) in northern Portugal were germinated in distilled water (control) a...
Natural Regeneration of Maritime Pine: A Review of the Influencing Factors and ...
Ribeiro, Stéphanie; Cerveira, Adelaide; Soares, Paula; Fonseca, TeresaThe main objective of the present work was to review the current knowledge about the factors that influence the different phases of the natural regeneration of maritime pine (Pinus pinaster Aiton) and propose scientifically based management schedules. The review focused on the natural regeneration of maritime pine within its most representative areas (Portugal, Spain, and France). First, a brief characterisatio...
A mathematical model for vineyard replacement with nonlinear binary control opt...
Galindro, Aníbal; Cerveira, Adelaide; Torres, Delfim F. M.; Matias, João; Marta-Costa, AnaVineyard replacement is a common practice in every wine-growing farm since the grapevine production decays over time and requires a new vine to ensure the business sustainability. In this paper, we formulate a simple discrete model that captures the vineyard’s main dynamics such as production values and grape quality. Then, by applying binary nonlinear programming methods to find the vineyard replacement trigge...
Size–density trajectory in regenerated maritime pine stands after fire
Enes, Teresa; Lousada, José Luís; Aranha, José; Cerveira, Adelaide; Alegria, C.M.M.; Fonseca, TeresaResearch Highlights: This study bridges a gap of knowledge about the maximum size–density trajectory for juvenile stands of maritime pine. The continuity of the trajectory along the development stages to maturity is assured with a straightforward approach providing support to determine optimum density along all the revolution periods for the species. Background and Objectives: Forest fire is a significant threa...
Logistic operations in a hospital: a multi-item inventory distribution problem ...
Agra, Agostinho; Cerveira, Adelaide; Requejo, CristinaA multi-item inventory distribution problem motivated by a practical case study occurring in the logistic operations of a hospital is considered. There, a single warehouse supplies several nursing wards. The distribution of medical products is done by two different teams of workers using a heterogeneous fleet, that is, the available vehicles have different capacities and different structures required to be used...
A mathematical model for vineyard replacement with nonlinear binary control opt...
Galindro, Aníbal; Torres, Delfim; Marta-Costa, A.; Matias, João; Cerveira, AdelaideVineyard replacement is a common practice in every wine-growing farm since the grapevine production decays over time and requires a new vine to ensure the business sustainability. In this paper, we formulate a simple discrete model that captures the vineyard's main dynamics such as production values and grape quality. Then, by applying binary non-linear programming methods to find the vineyard replacement trigg...
Simulation of alternative scenarios in portuguese wine sector: an agent-based m...
Galindro, Aníbal; Santos, Cátia; Marta-Costa, A.; Matias, João; Cerveira, AdelaideThe wine sector is one of the most remarkable industries in Portugal exhibited by the several and important demarcated regions. This paper intends to predict the wine industry farm sustainability of two of the most relevant Portuguese regions, North and Alentejo. The available data on the Portuguese Farm Accountancy Data Network (PTFADN 2001-2012) which compiles social, economic and environmental parameters fro...