Encontrados 58 documentos, a visualizar página 1 de 6
Quantitative Assessment of the Relationship between Land Use/Land Cover Changes...
Parente, Joana; Tonini, Marj; Stamou, Zoi; Koutsias, Nikos; Pereira, MárioWildfires are key drivers of land use/land cover (LULC) dynamics by burning vegetation and affecting human infrastructure. On the contrary, LULC changes (LULCCs) may affect the fire regime by influencing vegetation type, burnable areas, fuel loads and continuity. This study investigates the relationship between LULCC and wildfires. We developed a methodology based on different indicators, which allowed us to qu...
Simulation-based optimization of fluid distribution for enhanced grinding perfo...
Costa, Sharlane Maria; Pereira, Mário; Ribeiro, J. E.; Soares, DelfimGrinding fluids play a crucial role in removing heat and debris during grinding processes. Their distribution directly affects the grinding results, particularly in reaching the contact zone between the wheel and workpiece [1]. Our study introduces a novel approach utilizing wheels with internal channels to distribute grinding fluid from the center of the wheel to the workpiece, aiming to reduce the air barrier...
Effect of iron-doping on the structure and photocatalytic activity of TiO2 nano...
Afonso, Cátia; Júnior, Orlando Sousa Lima; Segundo, Iran Gomes Rocha; Júnior, Salmon Landi; Margalho, Élida Melo; Homem, Natália Cândido; Pereira, MárioThis research reports a simple, innovative, and low-cost doping method of TiO2 nanoparticles presenting the effects of calcination and the weight ratio of TiO2:FeCl3 (1:0.33–1:4.5). The photocatalytic activity of the nanomaterials was investigated by decolorizing Rhodamine B (RhB) dye in an aqueous solution. The main results showed that there is anatase-to-rutile transformation after the calcination process. Th...
Electrical properties of flexible ceramics
Kiran Kumar, N. S.; Jayakrishnan, A. R.; Rugmini, R.; Silva, José Pedro Basto; Pereira, Mário; Sugumaran, Sathish; Sekhar, K. C.Flexible ceramics subsume all the functional properties of bulk ceramics, but in a format that has been modified to withstand mechanical contorts. Understanding the mechanism of electrical properties as a function of mechanical deformations such as bending, stretching, etc. is critical to optimize the device performance. This chapter presents a comprehensive collection of various electrical properties such as d...
Wear behavior of a new composite formulation, with TEOS addition, for abrasive ...
Capela, Paulina Araújo; Costa, Sharlane Maria; Souza, M. S.; Carvalho, Sérgio Manuel Freitas; Pereira, Mário; Carvalho, L.; Gomes, J. R.; Soares, DelfimVitrified grinding wheels are used in many manufacturing industries to shape and finish metals and other materials in an efficient way. This work addresses a new approach with the use of tetraethyl orthosilicate solution (TEOS solution or silica sol), as an additive, in vitrified abrasive composites for grinding wheels. Different types of composite were produced using always the same materials and processing me...
Thickness-dependent microstructure, resistive switching, ferroelectric, and ene...
Tasneem, Muhassinah; Monteiro, Carlos R.P.; Kumar, N. S.Kiran; Silva, José Pedro Basto; Sekhar, K. C.; Kamakshi, K.; Pereira, MárioIn this work, we have studied the effect of thickness on structural, morphological, resistive switching (RS), ferroelectric, and energy storage properties of 0.85[0.6Ba (Zr0.2Ti0.8)O3-0.4(Ba0.7Ca0.3)TiO3]-0.15SrTiO3 (BZCT-STO) thin films deposited by the pulsed laser deposition technique. X-ray diffraction (XRD) analysis suggests that BZCT-STO thin films exhibit a polycrystalline tetragonal structure. The latti...
Benefits of pilates in the elderly population : a systematic review and meta-an...
Pereira, Mário; Mendes, Rodrigo; Mendes, Rui; M. L. Martins, Fernando; Gomes, Ricardo; Gama, José; Dias, Gonçalo; Castro, Maria AntónioThe aim of this systematic review is to collect and summarize the benefits of Pilates in the elderly population (>60 years old), within the current scientific production, assessing its contribution to Healthy Ageing (HA). We used PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analysis) to select, collect, and analyse this thematic. The methodological procedures were registered in the PROSPERO...
Efficacy of pilates in functional body composition : a systematic review
Pereira, Mário; Dias, Gonçalo; Mendes, Rodrigo; Mendes, Rui; M. L. Martins, Fernando; Gomes, Ricardo; Gama, José; Castro, Maria António; Vaz, VascoThe aim of this review was to collect and systematize results of studies from the last 5 years concerning the influence of the Pilates method (PM) on functional body composition (FBC). Methods: The criteria of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) were used in this review. We conducted research in three scientific databases: (i) Web of Science Core Collection, (ii) SCOPUS, ...
Experimental validation of a computational fluid dynamics model using micro‐par...
Pereira, Mário; Silva, Gonçalo; Semiao, Viriato; Silverio, Vania; Martins, Jorge; Pascoal-Faria, Paula; Alves, Nuno; Dias, Juliana; Ginjeira, AntónioThis study aimed to experimentally validate a computational fluid dynamics (CFD) model, using micro-particle image velocimetry (micro-PIV) measurements of the irrigation flow velocity field developed in confluent canals during irrigation with a side-vented needle. A microchip with confluent canals, manufactured in polydimethylsiloxane was used in a micro-PIV analysis of the irrigation flow using a side-vented n...
Dimensional variations on drying of composite components for abrasive wheels
Costa, Sharlane; Capela, Paulina Araújo; Pereira, Mário; Ribeiro, João; Soares, DelfimAbrasive wheels are composed of abrasive grains, vitreous bond precursors and a temporary binder that, normally, includes a liquid part to give consistency and plasticity to the green body [1]. During the drying thermal cycle, there are length variations in the material caused by thermal expansion and water elimination. These can originate the formation of cracks in the composite. In this work, the effect of th...