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Ruy Alberto Corrêa Altafim
Ruy Alberto Corrêa Altafim
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Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applications
RAP Altafim, X Qiu, W Wirges, R Gerhard, RAC Altafim, HC Basso, ...
Journal of Applied Physics 106 (1), 2009
1792009
Piezoelectrets from thermo-formed bubble structures of fluoropolymer-electret films
RAC Altafim, HC Basso, RAP Altafim, L Lima, CV De Aquino, LG Neto, ...
IEEE transactions on dielectrics and electrical insulation 13 (5), 979-985, 2006
1262006
Incipient fault diagnosis in power transformers by data-driven models with over-sampled dataset
SM de Andrade Lopes, RA Flauzino, RAC Altafim
Electric Power Systems Research 201, 107519, 2021
562021
Ionic impurities in nematic liquid crystal displays
MR Costa, RAC Altafim, AP Mammana
Liquid Crystals 28 (12), 1779-1783, 2001
562001
Laminated tubular-channel ferroelectret systems from low-density polyethylene films and from fluoroethylene-propylene copolymer films-A comparison
RAP Altafim, D Rychkov, W Wirges, R Gerhard, HC Basso, RAC Altafim, ...
IEEE Transactions on Dielectrics and Electrical Insulation 19 (4), 1116-1123, 2012
472012
A novel method for electret production using impulse voltages
RAC Altafim, JA Giacometti, JM Janiszewski
IEEE transactions on electrical insulation 27 (4), 739-743, 1992
411992
Hydrophobicity classification of polymeric materials based on fractal dimension
D Thomazini, MV Gelfuso, RAC Altafim
Materials Research 11, 415-419, 2008
382008
Electrical modeling of liquid crystal displays-LCDs
MR Costa, RAC Altafim, AP Mammana
IEEE transactions on dielectrics and electrical insulation 13 (1), 204-210, 2006
302006
A system for simulataneous measurements of lightning induced voltages on lines with and without arresters
A Piantini, TO Carvalho, A Silva Neto, JM Janiszewski, RAC Altafim, ...
ICLP 2004. Proceedings, 2004
292004
A new route to piezo-polymer transducers: 3D printing of polypropylene ferroelectrets
YAO Assagra, RAP Altafim, JP do Carmo, RAC Altafim, D Rychkov, ...
IEEE Transactions on Dielectrics and Electrical Insulation 27 (5), 1668-1674, 2020
282020
Practical methodology for modeling and simulation of a lightning protection system using metal-oxide surge arresters for distribution lines
MA Araujo, RA Flauzino, RAC Altafim, OE Batista, LA Moraes
Electric Power Systems Research 118, 47-54, 2015
282015
Fluoropolymer piezoelectrets with tubular channels: resonance behavior controlled by channel geometry
RA Pisani Altafim, RA Corrêa Altafim, X Qiu, S Raabe, W Wirges, ...
Applied Physics A 107, 965-970, 2012
282012
Piezoelectricity in multi-air voids electrets
RAC Altafim, HC Basso, LG Neto, L Lima, RAP Altafim, CV De Aquino
CEIDP'05. 2005 Annual Report Conference on Electrical Insulation and …, 2005
282005
The effects of fillers on polyurethane resin-based electrical insulators
RAC Altafim, CR Murakami, S Claro Neto, LCR Araújo, GO Chierice
Materials Research 6, 187-191, 2003
222003
Piezoelectrets with well‐defined cavities produced from 3D‐printed acrylonitrile butadiene styrene structures
YAO Assagra, RAP Altafim, RAC Altafim, JP Carmo
Electronics Letters 51 (24), 2028-2030, 2015
212015
Piezoelectrets: a brief introduction
M Moreira, IN Soares, YAO Assagra, FSI Sousa, TM Nordi, DM Dourado, ...
IEEE Sensors Journal 21 (20), 22317-22328, 2021
182021
Hydrophone based on 3D printed polypropylene (PP) piezoelectret
TTC Palitó, YAO Assagra, RAP Altafim, JP Carmo, RAC Altafim
Electronics Letters 55 (4), 203-204, 2019
182019
Piezoelectret-based hydrophone: An alternative device for vibro-acoustography
LJ De Medeiros, HAS Kamimura, RAP Altafim, AAO Carneiro, MF Amorim, ...
Measurement Science and Technology 26 (9), 095102, 2015
162015
Three-layer ferroelectrets from perforated Teflon®-PTFE films fused between two homogeneous Teflon®-FEP films
HC Basso, RAP Altafim, RAC Altafim, A Mellinger, P Fang, W Wirges, ...
2007 Annual Report-Conference on Electrical Insulation and Dielectric …, 2007
162007
Classification of polymers insulators hydrophobicity basead on digital image processing
D Thomazini, MV Gelfuso, RAC Altafim
Materials Research 15, 365-371, 2012
152012
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Artículos 1–20