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4. Introduction

Author

Velez, Fernando José, primary, Borges, Luís Miguel, additional, Barroca, Norberto, additional, and Chatzimisios, Periklis, additional

Published
2022
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17. Carbon Fiber Epoxy Composites for Both Strengthening and Health Monitoring of Structures.

Author

Salvado, Rita, Lopes, Catarina, Szojda, Leszek, Araújo, Pedro, Gorski, Marcin, Velez, Fernando José, Castro-Gomes, João, and Krzywon, Rafal

Subjects
CARBON fibers, EPOXY coatings, ASTERACEAE, FIBERS, DYNAMOMETER
Abstract

This paper presents a study of the electrical and mechanical behavior of several continuous carbon fibers epoxy composites for both strengthening and monitoring of structures. In these composites, the arrangement of fibers was deliberately diversified to test and understand the ability of the composites for self-sensing low strains. Composites with different arrangements of fibers and textile weaves, mainly unidirectional continuous carbon reinforced composites, were tested at the dynamometer. A two-probe method was considered to measure the relative electrical resistance of these composites during loading. The measured relative electrical resistance includes volume and contact electrical resistances. For all tested specimens, it increases with an increase in tensile strain, at low strain values. This is explained by the improved alignment of fibers and resulting reduction of the number of possible contacts between fibers during loading, increasing as a consequence the contact electrical resistance of the composite. Laboratory tests on strengthening of structural elements were also performed, making hand-made composites by the "wet process", which is commonly used in civil engineering for the strengthening of all types of structures in-situ. Results show that the woven epoxy composite, used for strengthening of concrete elements is also able to sense low deformations, below 1%. Moreover, results clearly show that this textile sensor also improves the mechanical work of the strengthened structural elements, increasing their bearing capacity. Finally, the set of obtained results supports the concept of a textile fabric capable of both structural upgrade and self-monitoring of structures, especially large structures of difficult access and needing constant, sometimes very expensive, health monitoring. [ABSTRACT FROM AUTHOR]

Published
2015
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18. Measurement-Based Characterization of the 5G

Author

Francisco, Salomão Manuel and Velez, Fernando José da Silva

Subjects
Propagação Em Pequena Células, Ambiente de Medição de Interior e Exterior, Estação de Base, Antena Dipolo, Interferência, Lte-Advanced, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Ondas Eletromagnéticas, 5g, Analisador de Espectros
Abstract

Made available in DSpace on 2022-01-14T17:06:44Z (GMT). No. of bitstreams: 1 8375_18016.pdf: 3953661 bytes, checksum: 650400e31cda3779ef8c582a463a73f7 (MD5) Previous issue date: 2021-07-01

Published
2021

19. Cellular Planning and Optimization for 4G and 5G Mobile Networks

Author

Ramos, Anderson Rocha and Velez, Fernando José da Silva

Subjects
Lte, Spectrum Sharing, Hetnet, 4g, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Small Cell, Propagation Model, 5g
Abstract

Made available in DSpace on 2020-03-18T16:43:39Z (GMT). No. of bitstreams: 1 7124_15081.pdf: 19615932 bytes, checksum: d5d83f6ebb460ad4cd2b5e19e281905f (MD5) Previous issue date: 2019-07-19

Published
2019

20. Optimization of Small Cells Deployment and Frequency Assignment using Spectrum Sharing

Author

Silva, Bruno Cruz Da and Velez, Fernando José da Silva

Subjects
Modelos de Propagação do Itu-R, Redes Heterogéneas, Capacidade de Sistema, Partilha de Espectro, Pequenas Células, New Radio, Lte-Advanced, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Ondas Milimétricas, 5g
Abstract

Made available in DSpace on 2020-03-06T16:47:58Z (GMT). No. of bitstreams: 1 6658_14375.pdf: 2912076 bytes, checksum: e7b0c8b35723c5f8fabd4b58f988f897 (MD5) Previous issue date: 2018-11-19

Published
2018

21. Wireless Sensor Networking Applied to Swarms of Aquatic Drones

Author

Nadziejko, Aleksandra Katarzyna and Velez, Fernando José da Silva

Subjects
Short-Range Communication, Wsns, Swarms of Aquatic Drones, Unmanned Surface Vehicles, Xbee, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Lora, Rf Communication, Multi-Agent Systems, Usvs
Abstract

Made available in DSpace on 2018-08-29T15:57:05Z (GMT). No. of bitstreams: 1 4906_10783.pdf: 1644266 bytes, checksum: 02b8afd189a8974c24ce73173fede8fb (MD5) Previous issue date: 2016-07-04

Published
2016

22. Planning and dynamic spectrum management in heterogeneous mobile networks with QoE optimization

Author

Robalo, Daniel Luís Silveira and Velez, Fernando José da Silva

Subjects
Redes móveis, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Redes sem fios - Optimização, Redes sem fios - Gestão de recursos rádio integrada, Redes sem fios - Planeamento celular
Abstract

Submitted by Helena Fortuna (hfortuna@ubi.pt) on 2016-02-24T12:16:34Z No. of bitstreams: 1 Tese_final_corr_pos_defesa.docx: 14555571 bytes, checksum: 2ae834831f607e31ca235b53fb232b52 (MD5) Made available in DSpace on 2016-02-24T12:16:34Z (GMT). No. of bitstreams: 1 Tese_final_corr_pos_defesa.docx: 14555571 bytes, checksum: 2ae834831f607e31ca235b53fb232b52 (MD5) Previous issue date: 2014-08

Published
2014

23. Convergência de redes sem fios para comunicações M2M e internet das coisas em ambientes inteligentes

Author

Gouveia, Paulo Renato Neves Torres and Velez, Fernando José da Silva

Subjects
Redes de sensores sem fios, Machine-to-Machine, Internet of things, RSSF
Abstract

Submitted by Joana Lopes Dias (jdias@ubi.pt) on 2014-06-24T20:03:12Z No. of bitstreams: 1 Dissertação_Mestrado_Paulo_T_Gouveia.pdf: 2734740 bytes, checksum: 5bc0fd0b23bb2ca05a308940b5bb3a6d (MD5) Made available in DSpace on 2014-06-24T20:03:12Z (GMT). No. of bitstreams: 1 Dissertação_Mestrado_Paulo_T_Gouveia.pdf: 2734740 bytes, checksum: 5bc0fd0b23bb2ca05a308940b5bb3a6d (MD5) Previous issue date: 2013-10

Published
2013

24. Modelo empírico de propagação para redes sem fios IEEE 802.16-2004

Author

Oliveira, João Gabriel Rodrigues and Velez, Fernando José da Silva

Subjects
Redes Wimax (Worldwide interoperability for microwave Access), Sistema de informação geográfica, Cobertura de rede - Propagação - Modelo, Redes sem fios, Operadores móveis e sem fios - Planeamento de redes
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T10:35:43Z No. of bitstreams: 1 Dissertação2010.pdf: 130090489 bytes, checksum: 836b057762a5ee0fd164255089fd1d2d (MD5) Made available in DSpace on 2015-09-21T10:35:43Z (GMT). No. of bitstreams: 1 Dissertação2010.pdf: 130090489 bytes, checksum: 836b057762a5ee0fd164255089fd1d2d (MD5) Previous issue date: 2010

Published
2010

25. Planeamento, desenvolvimento e optimização de redes WiMAX

Author

Robalo, Daniel Luís Silveira and Velez, Fernando José da Silva

Subjects
Redes WiMAX - Segurança, Redes sem fios - Dimensionamento de feixes, WiMAX (Worldwide Interoperability for Microwave Access), Planeamento celular - Cobertura, Redes sem fios - Norma IEEE 802.16
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T14:47:16Z No. of bitstreams: 1 Tese_Mestrado_Daniel.pdf: 10695022 bytes, checksum: 7301c9e37eec056e37171fd1b6084de1 (MD5) Made available in DSpace on 2015-09-21T14:47:16Z (GMT). No. of bitstreams: 1 Tese_Mestrado_Daniel.pdf: 10695022 bytes, checksum: 7301c9e37eec056e37171fd1b6084de1 (MD5) Previous issue date: 2008

Published
2008

26. Simulação e modelação de tráfego multi-serviço pós-3G na presença da mobilidade

Author

Paulo, Rui Filipe Rosa and Velez, Fernando José da Silva

Subjects
Comunicações móveis, Comunicações móveis - 3G (Terceira geração), Comunicações móveis - Modelo de tráfego, Comunicações móveis - Modelo de tráfego multi-serviço
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T13:43:13Z No. of bitstreams: 1 Rui Paulo.pdf: 30379602 bytes, checksum: cace58377eccdf83ca53a1a4a6913814 (MD5) Made available in DSpace on 2015-09-21T13:43:13Z (GMT). No. of bitstreams: 1 Rui Paulo.pdf: 30379602 bytes, checksum: cace58377eccdf83ca53a1a4a6913814 (MD5) Previous issue date: 2008

Published
2008

27. Optimização do planeamento da cobertura de sistemas de televisão digital terrestre em Portugal

Author

Rodrigues, Luis Da Silva and Velez, Fernando José da Silva

Subjects
Televisão digital terrestre - Planeamento de rede - Portugal, Televisão digital terrestre - Portugal, Padrão H.264/AVC (Video Coding Standard/Advanced Video Coding), BUD-T (Digital Video Broadcasting-Territorial), OFDM (Orthogonal Frequency Division Multiplex)
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T13:53:24Z No. of bitstreams: 1 MestradoDVB-T.pdf: 4053126 bytes, checksum: 5c77308e84db016e66769ac31bd6a387 (MD5) Made available in DSpace on 2015-09-21T13:53:24Z (GMT). No. of bitstreams: 1 MestradoDVB-T.pdf: 4053126 bytes, checksum: 5c77308e84db016e66769ac31bd6a387 (MD5) Previous issue date: 2008

Published
2008

28. Desenvolvimento de dispositivos de rocolha de energia electromagnética integrados em vestuário e aplicados a redes sem fios de área corporal

Author

Saraiva, Henrique Morais and Velez, Fernando José da Silva

Subjects
Antenas têxteis, Comunicações com recolha de energia, Redes de comunicações, Ambiente inteligente
Abstract

Submitted by Joana Lopes Dias (jdias@ubi.pt) on 2014-06-24T20:24:36Z No. of bitstreams: 1 Dissertação_HenriqueMoraisSaraiva.pdf: 9947424 bytes, checksum: 3b9390af61413c8c9f6354e267030bfb (MD5) Made available in DSpace on 2014-06-24T20:24:36Z (GMT). No. of bitstreams: 1 Dissertação_HenriqueMoraisSaraiva.pdf: 9947424 bytes, checksum: 3b9390af61413c8c9f6354e267030bfb (MD5) Previous issue date: 2013-10

29. Optimization of the interoperability and dynamic spectrum management in mobile communications systems beyond 3G

Author

Cabral, Orlando Manuel Brito, Velez, Fernando José da Silva, and Prasad, Neeli Rashmi

Subjects
Common Radio Resource Management, Spectrum Aggregation, Event driven simulation, ad hoc network, SINR, Cross-layer design
Abstract

Submitted by Joana Lopes Dias (jdias@ubi.pt) on 2011-10-24T11:17:27Z No. of bitstreams: 1 Tese_Orlando.pdf: 11143170 bytes, checksum: 52a416450a3dc84b860e0820667e437b (MD5) Made available in DSpace on 2011-10-24T11:17:27Z (GMT). No. of bitstreams: 1 Tese_Orlando.pdf: 11143170 bytes, checksum: 52a416450a3dc84b860e0820667e437b (MD5) Previous issue date: 2010

30. Planeamento e optimização de uma rede sem fios IEEE 802.16-2004 no concelho da Covilhã

Author

Silva, Cláudio Comissário da and Velez, Fernando José da Silva

Subjects
Rede sem fios, WiMAX (Worldwide Interoperability for Microwave Access), WiMAX móvel - Norma IEEE 802.16, Planeamento celular - Propagação, Planeamento celular - Reutilização, Planeamento celular - Cobertura
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T15:35:31Z No. of bitstreams: 3 02 - Capa da tese.pdf: 39965 bytes, checksum: 7906b8a1608bb020d332c4c55085cb8e (MD5) 01 - Parte inicial_VFinal.pdf: 434145 bytes, checksum: 9320ce1b01ab102b27a14361c90e2728 (MD5) 00 - Dissertação Versão_Final.pdf: 11651725 bytes, checksum: 84eff4f2cccb22eb671286f5f90d1d6d (MD5) Made available in DSpace on 2015-09-21T15:35:31Z (GMT). No. of bitstreams: 3 02 - Capa da tese.pdf: 39965 bytes, checksum: 7906b8a1608bb020d332c4c55085cb8e (MD5) 01 - Parte inicial_VFinal.pdf: 434145 bytes, checksum: 9320ce1b01ab102b27a14361c90e2728 (MD5) 00 - Dissertação Versão_Final.pdf: 11651725 bytes, checksum: 84eff4f2cccb22eb671286f5f90d1d6d (MD5) Previous issue date: 2008

31. Desenvolvimento, simulação e validação de protocolos MAC e de encaminhamento para redes de sensores sem fios

Author

Tavares, Jorge Miguel da Silva and Velez, Fernando José da Silva

Subjects
Redes de sensores sem fios, Protocolos MAC - Validação, Redes de sensores sem fios - Protocolos MAC
Abstract

Submitted by Helena Fortuna (hfortuna@ubi.pt) on 2015-06-11T11:01:50Z No. of bitstreams: 1 Dissertação - Jorge Tavares - M1612 - Eng. Electromecânica.pdf: 3218163 bytes, checksum: b0d8230b1801723c6d2a39170534986a (MD5) Made available in DSpace on 2015-06-11T11:01:50Z (GMT). No. of bitstreams: 1 Dissertação - Jorge Tavares - M1612 - Eng. Electromecânica.pdf: 3218163 bytes, checksum: b0d8230b1801723c6d2a39170534986a (MD5) Previous issue date: 2009-08

32. Optimization of Spectrum Management in Massive Array Antenna Systems with MIMO

Author

Andrade, Rooderson Martines de and Velez, Fernando José da Silva

Subjects
Mimo, Massive Mimo, Beamforming, Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática [Domínio/Área Científica], Millimeter Waves, Synchronization, 5g, Usrp
Abstract

Made available in DSpace on 2020-03-04T16:56:32Z (GMT). No. of bitstreams: 1 6664_14374.pdf: 27035457 bytes, checksum: 6886fc9ca0d8ffa6dfec826d0d41b7b5 (MD5) Previous issue date: 2018-11-19

33. Sistemas com rádios cognitivos para a partilha eficiente dos espaços vazios da TV com LTE

Author

Alves, Helder Roberto Rodrigues, Velez, Fernando José da Silva, and Gomes, Álvaro Henrique da Conceição

Subjects
TVWS (TV white spaces), LTE (Long term evolution), Rádios cognitivos, Redes de comunicação móveis, DVB-T (Digital video broadcasting terrestrial)
Abstract

Submitted by Paulo Pessoa (pfep@ubi.pt) on 2015-09-21T11:08:40Z No. of bitstreams: 1 Helder_Alves_Msc.pdf: 4405399 bytes, checksum: 69487aee860b912b43afc87264a72ca3 (MD5) Made available in DSpace on 2015-09-21T11:08:40Z (GMT). No. of bitstreams: 1 Helder_Alves_Msc.pdf: 4405399 bytes, checksum: 69487aee860b912b43afc87264a72ca3 (MD5) Previous issue date: 2011

34. Innovative energy-efficient wireless sensor network applications and MAC sub-layer protocols employing RTS-CTS with packet concatenation

Author

Barroca, Norberto José Gil and Velez, Fernando José da Silva

Subjects
Redes de sensores sem fios, Redes de sensores sem fios - Eficiência energética, Redes de sensores sem fios - Protocolos de acesso, Protocolos de acesso - Acesso ao meio - Eficiência energética, Concatenação de pacotes
Abstract

Submitted by Helena Fortuna (hfortuna@ubi.pt) on 2015-05-04T15:13:45Z No. of bitstreams: 1 Tese Norberto Barroca.pdf: 13084154 bytes, checksum: b66585310737f630e3f526a7e9a5455b (MD5) Made available in DSpace on 2015-05-04T15:13:45Z (GMT). No. of bitstreams: 1 Tese Norberto Barroca.pdf: 13084154 bytes, checksum: b66585310737f630e3f526a7e9a5455b (MD5) Previous issue date: 2014-01

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