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Mostrando 1-12 de 159 artigos, teses e dissertações.
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1. Low-Overhead Low-Complexity Carrier Phase Recovery Technique for Coherent Multi-Band OFDM-Based Superchannel Systems Enabled by Optical Frequency Combs
Abstract In this paper, we have designed a low-overhead low-complexity carrier phase tracking scheme for OFDM-based superchannel transmission system enabled by optical frequency combs. In this scheme, taking advantage of the broadband phase coherence provided by optical frequency combs among the OFDM-bands, the carrier phase retrieved from pilot-subcarriers
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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2. Removal of organic matter from pre-treated domestic sewage in anaerobic biological reactor by a combined system of electrolytic and biological aerobic treatment
Resumo Os processos biológicos são os métodos mais difundidos para o tratamento de águas residuárias. No entanto, eles têm limitações para degradar poluentes tóxicos e refratários, contaminantes, que os processos eletroquímicos podem remover. Portanto, o objetivo da pesquisa foi verificar a possibilidade de tratamento de esgoto por um processo bio
Rev. Ambient. Água. Publicado em: 22/07/2019
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3. Frequency Domain Interleaving for Dense WDM Passive Optical Network
Abstract In this work, we introduce a new concept of frequency interleaving applied to passive optical networks based in Dense Wavelength Division Multiplexing (DWDM). In order to explore colorless ONUs approach, a single and centralized optical source is used to create the interleaved wavelengths for the downstream and upstream path. In this case, frequency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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4. Solitary plantar basal cell carcinoma
Abstract: Basal cell carcinoma is the most frequent skin cancer, generally located in hair-bearing, sunlight-exposed areas. Basal cell carcinoma usually occurs on the head and neck, but very rarely on extra-facial locations. We report a case of a 65-year-old woman presenting with a solitary non-healing ulcer on the sole of the right foot for two years. Histo
An. Bras. Dermatol.. Publicado em: 2018-06
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5. Influência de três porta-enxertos na produção comercial e qualidade da pimenta "Italiano Doce"
O cultivo de pimenta (Capsicum annuum L.) é muito importante para o setor produtivo do sudeste da Espanha. Especificamente, na província de Almería, são cultivados 7000 ha cada ano. Em razão da importância econômica da cultura para a região e a retirada de fumigantes do solo, técnicas agronômicas foram adotadas, a fim de controlar alguns patógenos
Ciênc. agrotec.. Publicado em: 2014-12
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6. Transmission of a 1.12 Tb/s superchannel over 452 km fiber
This paper describes the transmission of a non-guard interval 1.12 Tb/s 10-carrier superchannel, launched into a 226 km recirculating loop. After two round trips (452 km) a BER below the FEC limit (3.8 x 10-3) was still obtained. To evaluate the superchannel generation technique, up to 72 comb lines (OSNRmin = 12.7 dB) were generated and modulated (DP-QPSK)
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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7. All-optical cryptography through spectral amplitude and delay encoding
All-optical data encryption is a promising technology that could lead communication systems to an unprecedented degree of security. In this paper we use computer simulations to systematically investigate a new all-optical cryptography technique that is bit-rate independent and transparent to modulation formats. Encryption encompasses signal spectral slicing
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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8. Experimental optical generation of DP-16QAM modulation format for high spectral efficiency optical transmission
In this paper, we present a simple experimental method to generate a DP-16QAM optical signal for high spectral efficiency optical transmission. A 16QAM optical signal is generated by passing a DP-QPSK signal through a linear polarization filter in a certain angle so that a square 16QAM can be achieved. Afterwards, we use a polarization multiplexer in order t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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9. Proposal of a New Approach for BER Evaluation of Multirate, Multiservice OCDMA Systems (Proposta de uma nova abordagem para o cálculo da BER de sistemas OCDMA de Múltiplas taxas e multiserviços)
A contínua evolução da tecnologia de comunicações ópticas observada nos últimos anos vem possibilitando atender a crescente demanda dos usuários por maior largura de banda. Esta nova demanda é atribuída principalmente à popularidade crescente de aplicações de banda larga, tais como TV por protocolo de Internet (IPTV), televisão de alta definiç
Publicado em: 06/04/2013
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10. Notas sobre a versão em língua portuguesa da Escala de Bem-Estar Espiritual
OBJETIVO: Testar a Escala de Bem-Estar Espiritual (EBE), a versão em português da Spiritual Well-Being Scale (SWB), em uma amostra de universitários matriculados em cursos de pós-graduação da área da saúde, avaliando suas qualidades psicométricas. Entre os diferentes instrumentos que objetivam mensurar a espiritualidade, encontra-se a SWB, adaptada
J. bras. psiquiatr.. Publicado em: 2013
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11. Sistemas CDMA ópticos coerentes baseados em codificação de fase espectral / Coherent optical CDMA systems based on spectral phase coding
In this work we perform a comprehensive analysis of a spectral phase-encoded time spreading optical code division multiple access (SPECTS-OCDMA) system. Despite being a numerical study, efforts were concentrated on the investigation of more realistic scenarios using as much information as possible from implemented test-beds in laboratories. In this context,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/12/2012
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12. Optical cryptography through analog control of amplitude and delay of spectral slices: anlysis for NRZ and DQPSK signals. / Criptografia Ãptica mediante controle analÃgico da amplitude e do atraso de fatias espectrais: anÃlise para sinais NRZ e DQPSK.
This work investigates a technique to encrypt the optical signal for Transparent Optical Network, TON, in order to safeguard the confidentiality and guarantee the security of informations that are transmitted through the Telecommunications Network. The technique is assessed on the physical layer of the reference model for open systems interconnection, OSI, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2012