18 documents found, page 1 of 2
A New Grinding Wheel Design with a 3D Internal Cooling Structure System
Costa, Sharlane; Capela, Paulina; Souza, Maria S.; Gomes, José R.; Carvalho, Luís; Pereira, Mário J.; Soares, DelfimThis work discusses challenges in conventional grinding wheels: heat-induced tool wear and workpiece thermal damage. While textured abrasive wheels improve heat dissipation, the current surface-only methods, such as those based on laser and machining, have high renewal costs. The proposed manufacturing technology introduces an innovative 3D cooling channel structure throughout the wheel, enabling various channe...
Bacterioplankton community shifts during a spring bloom of Aphanizomenon gracil...
de Figueiredo, Daniela R. de; Lopes, Ana R.; Pereira, Mário J.; Polónia, Ana R. M.; Castro, Bruno B.; Gonçalves, Fernando; Gomes, Newton C. M.Climate change is enhancing the frequency of cyanobacterial blooms not only during summer but also in spring and autumn, leading to increased ecological impacts. The bacterioplankton community composition (BCC), in particular, is deeply affected by these blooms, although at the same time BCC can also play important roles in blooms’ dynamics. However, more information is still needed regarding BCC during species...
Bacterioplankton Community Shifts during a Spring Bloom of Aphanizomenon gracil...
de Figueiredo, Daniela R.; Lopes, Ana R.; Pereira, Mário J.; Polónia, Ana R. M.; Castro, Bruno B.; Gonçalves, Fernando; Gomes, Newton C. M.Climate change is enhancing the frequency of cyanobacterial blooms not only during summer but also in spring and autumn, leading to increased ecological impacts. The bacterioplankton community composition (BCC), in particular, is deeply affected by these blooms, although at the same time BCC can also play important roles in blooms’ dynamics. However, more information is still needed regarding BCC during species...
Texturing methods of abrasive grinding wheels: a systematic review
Costa, Sharlane; Pereira, Mário J.; Ribeiro, J.E.; Soares, DelfimCreating textures on abrasive wheels is a strategy that allows a significant improvement in grinding operations. The reduction of the internal stresses in the workpiece and the temperature during the grinding operation generates an increase in the dimensional accuracy of the workpiece and a longer tool life. Textured abrasive wheels can be produced in many different ways. Depending on the processing method, the...
Control of the dimensional variation adjusting the thermal drying cycle of abra...
Costa, Sharlane; Marques, F.D.P.; Pereira, Mário J.; Ribeiro, J.E.; Soares, DelfimIn composite production, during the thermal drying cycle (T<100ºC), size variation of the composite material occurs due to thermal expansion and water elimination. However, when incorporating PLA components, produced by additive manufacturing, into the abrasive composite, the dimensional variation of the set is very large due to the higher polymer thermal expansion. During this stage, this composite, still in t...
O papel dos zoos na Cidadania e na Educação Ambiental
Santos, Maria João Salgado da Silva; Pereira, Mário J.; Azeiteiro, Ulisses M.A Educação Ambiental permite a formação de cidadãos conscientes e preparados para os desafios ambientais atuais, nomeadamente a perda de biodiversidade. Os Zoos são equipamentos de educação ambiental que utilizam atividades educativas, com o objetivo de informar a população sobre a biodiversidade e os desafios para sua conservação. Estas atividades poderão reforçar o impacto educacional desses equipamentos de e...
O papel dos zoos na cidadania e na educação embiental: educar para conservar
Santos, Maria João S. S.; Pereira, Mário J.; Azeiteiro, Ulisses M.A Educação Ambiental permite a formação de cidadãos conscientes e preparados para os desafios ambientais atuais, nomeadamente a perda de biodiversidade. Os Zoos são equipamentos de educação ambiental que utilizam atividades educativas, com o objetivo de informar a população sobre a biodiversidade e os desafios para sua conservação. Estas atividades poderão reforçar o impacto educacional desses equipamentos de e...
Comunidade de diatomáceas como bioindicador da qualidade da água: uma atividade...
Santos, Martha; Pereira, Mário J.; Luís, Ana T.; Gonçalves, Fernando J.M.; Vidal, TâniaAtividades como a agricultura, indústria, desenvolvimento urbano e alterações climáticas originam sérios impactos nos sistemas de água doce, levando à sua degradação e perda de biodiversidade. Portanto, é necessário monitorizar e recuperar todas as massas de água para que estas atinjam um bom estado ecológico. A comunidade de perifiton, nomeadamente as diatomáceas, revelou ser um excelente bioindicador na monit...
Reproductive biology and genetic diversity of the green turtle (Chelonia mydas)...
Anastácio, Rita; Santos, Camila; Lopes, Cardoso; Moreira, Helena; Souto, Luis; Ferrão, Jorge; Garnier, Julie; Pereira, Mário J.INTRODUCTION: Vamizi, an Island located in the Western Indian Ocean, is visited by a small and not fully characterized green turtle (Chelonia mydas (L.)) population. This population is threatened by natural hazards and several human activities, which are used to identify conservation priorities for marine turtles. It was our aim to contribute to the knowledge of marine turtles that nest in Vamizi, with respect ...
Comparison of methodologies for the extraction of bacterial DNA from mussels-re...
Oliveira, Jacinta M.; Cunha, Ângela S.; Almeida, Adelaide P.; Castilho, Fernanda B.; Pereira, Mário J.The control of the microbiological quality of bivalve molluscs assumes particular importance because they are among the most produced seafood products and mostly consumed as a whole, raw, or lightly cooked. The composition of the bacterial community associated with bivalves depends mostly on the microbiology of the surrounding environment at growing sites. Once the relationship between microbiology of bivalves ...