Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Marcelo Sampaio de Alencar"'
Publikováno v:
EURASIP Journal on Advances in Signal Processing, Vol 2021, Iss 1, Pp 1-28 (2021)
Abstract This paper presents a proposal to a source-filter theory of voice production, more precisely related to voiced sounds. It is a proposal of a model to generate signal using linear and time-invariant systems and takes into account the phonatio
Externí odkaz:
https://doaj.org/article/471edb87eeb347b88005d90c94e8f9a6
Autor:
Felipe Pinheiro Correia, Samara Ruthielle da Silva, Fabricio Braga Soares de Carvalho, Marcelo Sampaio de Alencar, Karcius Day Rosario Assis, Rodrigo Moreira Bacurau
Publikováno v:
Energies, Vol 16, Iss 5, p 2356 (2023)
The use of Wireless Sensor Networks (WSN) in smart agriculture has emerged in recent years. LoRaWAN (Long Range Wide Area Networks) is widely recognized as one of the most suitable technologies for this application, due to its capacity to transmit da
Externí odkaz:
https://doaj.org/article/a620b66ea1254802a4d6a67867511add
Publikováno v:
Revista Principia, Vol 1, Iss 28, Pp 144-155 (2015)
Esse artigo apresenta uma revisão das técnicas de diversidade aplicadas para comunicação óptica no espaço livre na presença de turbulência. Para isto são revistas as literaturas mais recentes que tratam da utilização do enlace óptico no e
Externí odkaz:
https://doaj.org/article/c6f0fde819434f2ab1a55799576965db
Autor:
Felipe Pinheiro Correia, Marcelo Sampaio de Alencar, Waslon Terllizzie Araújo Lopes, Mauro Soares de Assis, Brauliro Gonçalves Leal
Publikováno v:
International Journal of Antennas and Propagation, Vol 2017 (2017)
Wireless sensor networks have been proposed as a solution to obtain soil and environment information in large distributed areas. The main economic activity of the São Francisco Valley region in the Northeast of Brazil is the irrigated fruit producti
Externí odkaz:
https://doaj.org/article/98b19871226e4183b02ddb54b7b98637
Publikováno v:
Journal of Electrical and Computer Engineering, Vol 2014 (2014)
Externí odkaz:
https://doaj.org/article/3e820b1bbaba48e09269ebdd662d7cac
Autor:
Jefferson Costa e Silva, Alfrêdo Gomes Neto, Joabson Nogueira de Carvalho, Marcelo Sampaio de Alencar
Publikováno v:
Revista Principia, Vol 0, Iss 7, Pp 7-11 (1999)
A perda média de penetração, PMP, é um parâmetro de propagação muito útil ao se estimar o nível de potência após um obstáculo.
Externí odkaz:
https://doaj.org/article/235a82cca435459891c4de0c79e0f0f2
Autor:
Jefferson Costa e Silva, Alfrêdo Gomes Neto, Marcos Eduardo do Prado Villarroel Zurita, Kécio Patrick Delgado Ferreira, Marcelo Sampaio de Alencar
Publikováno v:
Revista Principia, Vol 6, Iss 0, Pp 4-8 (1998)
Devido à crescente demanda pelos sistemas de comunicação móveis sem fio, as operadoras de comunicações móveis estão procurando reduzir o tamanho de suas células, ao máximo, visando ao aumento de suas respectivas capacidades [...].
Externí odkaz:
https://doaj.org/article/7581ce3cdd2e42899814d3654c55892d
Autor:
Marcelo Sampaio de Alencar, Raphael Tavares de Alencar, Raissa Bezerra Rocha, Ana Isabela Cunha
A considerable amount of effort has been devoted, both in industry and academia, towards the design, performance, analysis and evaluation of amplification schemes and filters to be used in control systems, audio/video equipment, instrumentation and c
Autor:
Marcelo Sampaio de Alencar
The book presents the fundamentals of music science, followed by a discussion on the historical evolution of music. An introduction to the analysis of signals in time and frequency is presented, which includes sound and noise. Features and mathematic
Autor:
Marcelo Sampaio de Alencar
In recent years, a considerable amount of effort has been devoted, both in industry and academia, towards the design, performance analysis and evaluation of modulation schemes to be used in wireless and optical networks, towards the development of th