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Ruy Alberto Pisani Altafim
Ruy Alberto Pisani Altafim
E-mail confirmado em ci.ufpb.br
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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
1772009
Influence of the solvent evaporation rate on the crystalline phases of solution‐cast poly (vinylidene fluoride) films
DL Chinaglia, R Gregorio Jr, JC Stefanello, RA Pisani Altafim, W Wirges, ...
Journal of applied polymer science 116 (2), 785-791, 2010
1432010
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
1222006
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
422012
Treatment with orthophosphoric acid enhances the thermal stability of the piezoelectricity in low-density polyethylene ferroelectrets
D Rychkov, R Alberto Pisani Altafim, X Qiu, R Gerhard
Journal of Applied Physics 111 (12), 2012
392012
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
272012
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
262005
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
192015
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
172019
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
172007
Piezoelectrets: A brief introduction
M Moreira, IN Soares, YAO Assagra, FSI Sousa, TM Nordi, DM Dourado, ...
IEEE Sensors Journal 21 (20), 22317-22328, 2021
132021
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
132015
Unipolar ferroelectrets-Following the example of the electret microphone more closely
D Rychkov, RAP Altafim, R Gerhard
2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena …, 2014
132014
Ferroelectret two-layer and multilayer composite and method for production thereof
W Jenninger, J Wagner, G Walze, D Schapeler, H Pudleiner, G Stollwerck, ...
US Patent App. 12/998,838, 2011
102011
Piezoelectric sensor based on electret thermoforming technology
DR Falconi, RAC Altafim, RAP Altafim, HC Basso, W Wirges, R Gerhard
2010 10th IEEE International Conference on Solid Dielectrics, 1-3, 2010
102010
Low-cost electro-acoustic system based on ferroelectret transducer for characterizing liquids
TTC Palitó, YAO Assagra, RAP Altafim, JP Carmo, RAC Altafim
Measurement 131, 42-49, 2019
82019
Study of timber crossarms coated with castor oil-based polyurethane resins: Electrical and mechanical tests
RAC Altafim, JFR Silva, HC Basso, CC Junior, JC Sartori, RAP Altafim, ...
Conference Record of the 2004 IEEE International Symposium on Electrical …, 2004
82004
Piezoelectric-magnetic behavior of ferroelectrets coated with magnetic layer
RAP Altafim, YAO Assagra, RAC Altafim, JP Carmo, TTC Palitó, ...
Applied Physics Letters 119 (24), 2021
72021
Polymer electrets and ferroelectrets as EAPs: models
D Rychkov, RAP Altafim
Carpi F, Electromechanically Active Polymers. Polymers and Polymeric …, 2016
72016
Piezoelectret sensors detect geometry-related modifications of the acoustical signatures from partial discharges in an electrical equipment chamber
Y Gutnik, RAP Altafim, PR Veronese, JF Resende, HC Basso, R Gerhard, ...
2012 Annual Report Conference on Electrical Insulation and Dielectric …, 2012
72012
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