107 documents found, page 1 of 11
Effect of coolant flow rate and depth of cut on grinding temperature using stru...
Costa, S.; Capela, Paulina Araújo; Ribeiro, J.; Pereira, M.; Soares, DelfimEffective control of heat and debris removal during grinding operations are crucial for process optimization. Various approaches are being studied to distribute adequately and efficiently the grinding fluid in the contact zone. This study evaluates an innovative methodology using grinding wheels with an internal network of “cooling channels” designed to deliver the grinding fluid directly from the wheel's core ...
Experimental and CFD simulation analysis of 3D cooling channels to improve the ...
Capela, Paulina Araújo; Costa, S.; Gomes, J. R.; Ribeiro, J.; Pereira, M.; Soares, DelfimEfficient heat and debris removal is essential to optimize the grinding process. A promising approach is the incorporation of three-dimensional channels in the grinding wheel to improve cutting fluid distribution. This study evaluates two types of grooved abrasive discs with spiral and hexagonal geometries, comparing them to a non-structured disc. In addition to experimental tests, Computational Fluid Dynamics ...
Enhancing lubrication efficiency in grinding wheels through internal channels s...
Costa, S.; Capela, Paulina Araújo; Ribeiro, J.; Pereira, M.; Soares, DelfimEffective control of heat and debris removal during grinding operations is critical for process optimization. The distribution of grinding fluids in the contact zone is being studied using different approaches (structured surfaces…). This study proposes an innovative methodology employing grinding wheels with an internal network of cooling channels designed to deliver grinding fluid directly from the wheel's ce...
Design of an experimental grinding machine for testing abrasive wheels with a 3...
Costa, S.; Araújo, P.; Capela, P.; Gomes, J. R.; Ribeiro, J.; Pereira, M.; Soares, DelfimPrecision manufacturing often utilizes grinding as a method to fabricate components with accuracy, enhanced surface quality, and desirable forming tolerances. The working conditions of a grinding machine and the attributes of the abrasive wheel play a crucial role in influencing the grinding process. Main challenges in grinding are related to heat dissipation, resulting in issues such as tool wear, increased fo...
Haute cuisine: A mixed-methods approach to assess gastronomic offer nutritional...
Pereira, M.; Sousa, S.; Melo, A.; Padrão, PatríciaIn recent years, a growing interest of society for out-of-home food experiences has been observed, concurrently with an increasing number of restaurants associated to haute cuisine. However, data on the nutritional adequacy of the meals offered in these restaurants is lacking. This study aimed to evaluate the perception of haute cuisine chefs in Portugal about the importance attributed to food and nutrition rec...
Remote operations and streamlining communication in mars analog missions: Robot...
Luz, R.; Coelho, G.; Campos, M.; Abrantes, R.; Querido, R.; Pereira, M.; Sousa, I.; Corujeira, J.; Silva, J. L.; Ventura, R.Human space exploration typically requires considerable teamwork involving multiple disciplines in science and engineering. Effective and efficient field systems and information flow with the support teams are paramount for mission success, particularly in crewed missions such as the upcoming Artemis (Moon) and planned Mars missions. Moreover, human-robotic teams will be crucial in such scenarios to allow human...
Affording heading in preschool and club children
Mercê, Cristiana; Catela, David; Pereira, M.; Teixeira, G.; Figueiredo, M.; Coelho, R.; Serrão-Arrais, Ana; Brígida, NancyHeading is an identitary skill of European football, that requires a balance between physical safety and acquisition, achievable through balloons with minimal impact and slow approach. This study aimed to investigate whether preschool children (P) (N=44, M=3.91±0.87 years, ♀=24) can perform self-heading using this educational solution and whether they demonstrate a performance similar to boys in football school...
Respiração lenta abdominal ióguica e variabilidade da frequência cardíaca em cr...
Mercê, Cristiana; Catela, David; Borges, A.; Santos, B.; Pereira, M.; Gomes, M.; Esperança, R.; Santos, Júlia; Oliveira, JoanaA variabilidade da frequência cardíaca (VFC) é um indicador de saúde. Uma respiração lenta pode propiciar o seu aumento. Fomos verificar se crianças de 7 e 8 anos conseguiriam executar uma respiração predominantemente diafragmática, e qual o seu efeito agudo em parâmetros da VFC. Ocorreu uma redução significativa da frequência respiratória e um aumento da VFC. As crianças conseguiram executar esta técnica respi...
Are lead-free relaxor ferroelectric materials the most promising candidates for...
Jayakrishnan, A. R.; Silva, José Pedro Basto; Kamakshi, K.; Dastan, D.; Annapureddy, V.; Pereira, M.; Sekhar, K. C.Dielectric capacitors offer high-power density and ultrafast discharging times as compared to electrochemical capacitors and batteries, making them potential candidates for pulsed power technologies (PPT). However, low energy density in different dielectric materials such as linear dielectrics (LDs), ferroelectrics (FEs), and anti-ferroelectric (AFEs) owing to their low polarization, large hysteresis loss and l...
Intelligent clinical decision support system for managing COPD patients
Pereira, J.; Antunes, N.; Rosa, J.; Ferreira, J.; Mogo, S.; Pereira, M.Chronic obstructive pulmonary disease (COPD) is the third leading cause of death worldwide. Health remote monitoring systems (HRMSs) play a crucial role in managing COPD patients by identifying anomalies in their biometric signs and alerting healthcare professionals. By analyzing the relationships between biometric signs and environmental factors, it is possible to develop artificial intelligence models that ar...