1- PALITÓ, T. T. C.; ASSAGRA, Y. A. O.; ALTAFIM, R. A. P.; CARMO, J. P.; ALTAFIM, R. A. C., Hydrophone based on 3D printed polypropylene (PP) piezoelectret. ELECTRONICS LETTERS, v. 55, p. 1, 2019.

2- DE SOUSA, F. S. I.; ALTAFIM, R. A. C.; ALTAFIM, R. A. P., Lightning Peak Current Sensor Based on Electret Technology. IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, v. 1, p. 1-8, 2019.

3- ALTAFIM, R. A. P.; ASSAGRA, Y. A. O.; CARMO, J. P.; ALTAFIM, R. A. C.; AMORIM, M. F., 3D printed sensitive pad based on ferroelectrets. In: Proceedings of the International conference on Electromechanically Active Polymer (EAP) transducers and artificial muscles, 2019, Dresden.

1- ALTAFIM, R. A. C.; CARVALHO, F. J.; ASSAGRA, Y. A. O.; BORGES, B. V.; ALTAFIM, R. A. P.,Electrical network models of one-and multidimensional ferroelectret structures with open tubular channels.. IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, v. 25, p. 822-828, 2018.

2- PALITÓ, T. T. C.; ASSAGRA, Y. A. O.; Altafim, R. A. P.; CARMO, J. P.; ALTAFIM, R. A. C.,Low-cost electro-acoustic system based on ferroelectret transducer for characterizing liquids. MEASUREMENT, v. 131, p. 42-49, 2018.

3- RYCHKOV, D.; ALTAFIM, R. A. P.,Template-based fluoroethylenepropylene ferroelectrets with enhanced thermal stability of piezoelectricity. JOURNAL OF APPLIED PHYSICS, v. 124, p. 174105, 2018.

4- PALITO, T. T. C.; ASSAGRA, Y. A. O.; ALTAFIM, R. A. C.; CARMOS, J. P. P.; CARNEIRO, A. A. O.; ALTAFIM, R. A. P., Investigation of water content in power transformer oils through ultrasonic measurements. In: Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2018, Cancun.

5- FERREIRA, J. L. S.; AMORIM, M. F.; ALTAFIM, R. A. P., Biometric patterns recognition using keystrokes dynamics. In: Anais do XVIII Simpósio Brasileiro em Segurança da Informação e de Sistemas Computacionais (SESeg), 2018, Natal. p. 224-238.

6- VALE, R. E. D.; LOPES, M. K. S.; AMORIM, M. F.; Altafim, R.A.P., Desenvolvimento de um Goniômetro Virtual baseado em sensor LEAP Motion. In: Anais do XXVI Congresso Brasileiro de Engenharia Biomédica, 2018, Busios.

1- DOMINGUES, C.; ALTAFIM, R. A. C.; SOUZA, F. S. I.; PALITO, T. T. C.; ALTAFIM, R. A. P.,Electronic Peak Lightning Current Detector. In: 14th International Symposium on Lightning Protection (XIV SIPDA), 2017, Natal.

2- ALTAFIM, R. A. C.; SOUZA, F. S. I.; PALITO, T. T. C.; ASSAGRA, Y. A. O.; ALTAFIM, R. A. P.,Detection of acoustic emissions from partial discharges in distribution transformers with piezoelectret transducers. In: IEEE International Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2017, Fort Worth. v. 1. p. 381-384.

3- FALCONI, D. R.; SOUZA, F. S. I.; ALTAFIM, R. A. C.; ALTAFIM, R. A. P., Capacitive-electret sensor for measuring high-voltage discharges In: 16th International Symposium on Electrets, Leuven, 2017, v. 1. p. 149.

4- NEPAL, N.; MELLINGER, A.;ALTAFIM, R. A. P., Finite element analysis of LIMM space charge deposition measurements in tubular channel ferroelectrets In: 16th International Symposium on Electrets, Leuven, 2017, v. 1. p.31.

5- NEPAL, N.; ALTAFIM, R. A. P.; MELLINGER, A., Space charge deposition in tubular channel ferroelectrets: A combined fluorescence imaging/LIMM study with finite element analysis, Journal of Applied Physics, Vol.121, Issue 24, 2017.

6- ARAÚJO, E. B. L.; SANTOS, L. M.; AMORIM, M. F.; ALTAFIM, R. A. P.; ALTAFIM, R. A. C., Piezoelectrets with closed tubular channels employed on pressure level measurements. In: 14th International Conference Physics of Dielectrics, 2017, Saint Petersburg. Physics of Dielectrics (Dielectrics-2017), 2017. v. 2. p. 305-307.

1- NEPAL, N.; MELLINGER, A.; ALTAFIM, R. A. P., Space charge build-in in tubular channel ferroelectrets. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2016 Toronto, Canada, pp. 388-391, 2016.

2- CARVALHO, F. J.; ALTAFIM, R. A. C.; ALTAFIM, R. A. P.; ASSAGRA, Y. A. O.; BORGES, B.-H. V., Electric circuit model for simulating ferroelectrets with open-tubular channels. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2016 Toronto, Canada, pp. 315-318, 2016.

3- SOUSA, F. S. I.; ALTAFIM, R. A. C.; FERREIRA, D. A. P.; ALTAFIM, R. A. P., Low-cost lightning current peak detector for installation on communication towers. In: IEEE Electrical Insulation Conference (EIC), 2016 Montreal, Canada, pp. 113-116, 2016.

4- ALTAFIM, R. A. C.; GONÇALVES Jr., L.; ALTAFIM, R. A. P.; CREPPE, R. C.; PIANTINI, A., One-port nonlinear electric circuit for simulating grounding systems under impulse current. Electrical Power Systems Research, Vol. 130, p. 259–265, 2016.

5- ASSAGRA, Y. A. O.; ALTAFIM, R. A. C.; CARMO, J. P.; ALTAFIM, R. A. P., Well-defined piezoelectrets fabricated with 3D printing technology. In: IEEE International Conference on Dielectrics, 2016 Montpellier, France, pp. 257-259, 2016.

6- QIU, X.; WIRGES, W.; GERHARD, R.; ALTAFIM, R. A. P., Heterogeneous polymers as capacitive sensors: Differences between foam cells and closed or open tubular channels. In: IEEE International Conference on Dielectrics, 2016 Montpellier, France, pp. 872-875, 2016.

7- RYCHKOV, D. and ALTAFIM, R. A. P., Polymer Electrets and Ferroelectrets as EAPs: Models. In: Federico Carpi (Editor) Electromechanically Active Polymers: A Concise Reference. On-line, Springer International Publishing, 2016, pp. 1-15.

1- DE MEDEIROS, L. J. ; KAMIMURA, H. A. S.; ALTAFIM, R. A. P.; CARNEIRO, A. A. O.; AMORIM, M. F.; ALTAFIM, R. A. C., Piezoelectret-based hydrophone: an alternative device for vibro-acoustography. Measurement Science and Technology, v. 26, p. 095102, 2015.

2- ALTAFIM, R. A. C.; GONÇALVES JR., L.; ALTAFIM, R. A. P.; CREPPE, R. C.; PIANTINI, A., One-port nonlinear electric circuit for simulating grounding systems under impulse current. Electrical Power Systems Research, Vol. 130, Jan. 2016, p. 259–265, 2015.

3- ASSAGRA, Y. A. O.; ALTAFIM, R. A. P.; ALTAFIM, R. A. C.; CARMO, J. P., Piezoelectrets with well-defined cavities produced from 3D-printed ABS structures. Electronics Letters, v. 51 (24), pp. 2028-2030, 2015.

4- RYCHKOV, D.; WIRGES, W.; GERHARD, R.; ALTAFIM, R. A. P., Unipolar Teflon-FEP ferroelectrets – Choice of negative electret charge enhances stability. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2015, Ann Arbor. 2015 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2015.

5- ARAÚJO, E. B. L.; AMORIM, M. F.; ALTAFIM, R. A. P.; CAVALCANTI, A. C.; ALTAFIM, R. A. C., Thin Teflon-FEP capacitors with open-tubular channels employed on low-pressure measurements for smart-grid monitoring systems. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2015, Ann Arbor. 2015 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2015.

6- ASSAGRA, Y. A. O.; ALTAFIM, R. A. C.; ALTAFIM, R. A. P., Thermo-formed piezoelectrets with open-tubular channels produced from water-filled FEP pads. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2015, Ann Arbor. 2015 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2015.

1- REIS, C. F.; ALTAFIM, R. A. P.; GUTNIK, Y.; ALTAFIM, R. A. C. ; CAVALCANTI, A. C., Comparative analysis between impulsive detection methods applied on partial discharge acoustic signals. In: IEEE International Instrumentation and Measurement Technology Conference, Montevideo, 2014. v. 1. p. 418-421.

2- SILVA, S. D. C.; ALTAFIM, R. A. P.; CAVALCANTI, A. C.; FALCONI, D. R.; ALTAFIM, R. A. C., Images from high-voltage impulse discharges evaluated with a developed graphical software. In: IEEE International Instrumentation and Measurement Technology Conference, Montevideo, 2014. v. 11. p. 82-85.

3- FALCONI, D. R.; ASSAGRA, Y. A. O.; ALTAFIM, R. A. P.; ALTAFIM, R. A. C., Influence of electrodes geometry on images formed by direct contact electrical discharge over electret films. In: 13th International Conference Physics of Dielectrics, 2014, Saint Petersburg. Physics of Dielectrics (Dielectrics-2014), 2014. v. 2. p. 154-157.

4- RYCHKOV, D.; ALTAFIM, R. A. P.; EFIMOV, N.; GERHARD, R., Improved thermal stability of FEP ferroelectrets through inner voids surface modification. In: 13th International Conference Physics of Dielectrics, 2014, Saint Petersburg. Physics of Dielectrics (Dielectrics-2014), 2014. v. 2. p. 160-162.

5- CAMARGO, V. C.; SILVA, S. H.; AMORIM, M. F.; NOHAMA, P., Instrumentation for the Detection and Interruption of Apnea Episodes for Premature Newborn. In: 36th International Conference of the IEEE Engineering in Medicine and Biology Society, 2014, Chicago/USA, 2014. v. 36. p. 2127-2130.

6- BARROS, V. J.; ALTAFIM, R. A. P.; AMORIM, M. F. ; ALTAFIM, R. A. C., Electrical response of open tubular piezoelectrets exposed to low pressures stimulations. In: XIII Brazilian MRS meeting, 2014, João Pessoa. XIII Encontro da SBPmat, 2014.

7- PALITO, T. T. C. ; ASSAGRA, Y. A. O. ; SILVA, J.F.R. ; ALTAFIM, R. A. C. ; ALTAFIM, R. A. P. ; REIS, C. F. ; AMORIM, M. F. ; CAVALCANTI, A. C., Acoustic detection of single and multiple air-gap partial discharges with piezoelectrets transducers. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2014, Des Moines. 2014 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2014. v. 1. p. 216-219.

8- RYCHKOV, D. ; ALTAFIM, R. A. P. ; GERHARD, R., Unipolar ferroelectrets Following the example of the electret microphone more closely. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2014, Des Moines. 2014 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2014. v. 1. p. 860-862.

9- FERREIRA, D. A. P.; KODAIHA, C.; ALTAFIM, R. A. P. ; GONÇALVES JR., L.; SILVA, J. F. R.; ALTAFIM, R. A. C., Análise da operação de para-raios de linha em sistemas de distribuição de energia elétrica. In: Congresso Brasileiro de Automática, 2014, Belo Horizonte. 2014 Anais do Congresso Brasileiro de Automática, 2014. v. 1. p. 2694-2699.

10- AMORIM, M. F.; PONCIANO, L. H. P.; CAVALCANTI, A. C.; ALTAFIM, R. A. P., Umidade relativa em incubadora neonatal: implicações sobre a sensação térmica do neonato. In: XXIV Congresso Brasileiro de Engenharia Biomédica (CBEB), 2014, Uberlândia. 2014 Anais do Congresso Brasileiro de Engenharia Biomédica, 2014, p. 2508-2511.