Transmission Channels
Mostrando 1-12 de 224 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. Sensitivity of hydrological connectivity in a semiarid basin with a high-density reservoir network
Resumo Os reservatórios de água, em geral, têm sido considerados a principal causa de redução da conectividade hidrológica a jusante nos canais. Portanto, este estudo tem como objetivo analisar a sensibilidade da conectividade hidrológica na bacia hidrográfica do reservatório de Orós, utilizando o modelo ResNet, desenvolvido para simular os process
Rev. Ambient. Água. Publicado em: 22/07/2019
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3. Novos percursos da ciência: as modificações da divulgação científica no meio digital a partir de uma análise contrastiva
RESUMO Este artigo investiga a forma com que enunciados orais de divulgação científica se adaptam ao meio digital, especificamente ao YouTube, para realizar sua função principal: criar em seu interlocutor uma cultura científica a partir do seu fundo aperceptível de compreensão responsiva e da cultura discursiva com que este se identifica. Para tanto,
Bakhtiniana, Rev. Estud. Discurso. Publicado em: 2019-03
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4. EDFA Design and Analysis for WDM Optical Systems Based on Modal Multiplexing
Abstract Modal multiplexing (MDM) is a core technology to allow a capacity increase in modern optical systems. However, in MDM links, the amplified WDM signal suffers not only from lack of spectral gain equalization but also from unequal modal gain. The proper design of the MDM-EDFA is crucial to provide modal gain equalization and to overcome those impairme
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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5. Link Optimization and Performance Analysis of a 40 Gbps DQPSK Modulated Ultra DWDM System with 32 Orthogonally Polarized channels
Abstract The demand for higher speed at a lesser transmission cost per bit resulted in growth of optical networks with improved spectral efficiency even at narrower channel spacing. Incorporation of multilevel modulation formats in DWDM system led to the exploration of the 25 GHz channel grid, popularly known as Ultra Dense Wavelength Division Multiplexed (U
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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6. Design of a Microstrip Diplexer and Triplexer Using Open Loop Resonators
Abstract In this paper a novel design of microstrip diplexer and triplexer using open loop resonators is presented. The proposed diplexer if formed by two band-pass filters for the Industrial Scientific Medical (ISM) applications at 5.8 GHz and the WIMAX applications (IEEE 802.16 WiMAX at 3.17 GHz to 4.2 GHz bands). The microstrip triplexer is designed for t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-06
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7. BIOFILM FORMATION OF Vibrio cholerae ON STAINLESS STEEL USED IN FOOD PROCESSING
Vibrio cholerae represents a significant threat to human health in developing countries. This pathogen forms biofilms which favors its attachment to surfaces and its survival and transmission by water or food. This work evaluated the in vitro biofilm formation of V. cholerae isolated from clinical and environmental sources on stainless steel of the type used
Rev. Inst. Med. trop. S. Paulo. Publicado em: 24/05/2016
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8. Removal of Lead(II), Copper(II) and Zinc(II) Ions from Aqueous Solutions Using Magnetic Amine-Functionalized Mesoporous Silica Nanocomposites
In this work, a batch adsorption study was conducted to investigate the removal efficiency of lead, copper and zinc ions from aqueous solutions. Magnetic amine-functionalized mesoporous silica nanoparticles were synthesized by grafting amine groups within the channels of magnetic mesoporous silica nanocomposites. Morphological and structural characterization
J. Braz. Chem. Soc.. Publicado em: 2015-11
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9. CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO2
Ag-Sn/CeO2 catalysts were synthesized by the co-precipitation method with different Ag-Sn wt.% loadings and were tested for the oxidation of CO. The catalysts were characterized by powder X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS), and s
J. Braz. Chem. Soc.. Publicado em: 2015-04
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10. A new microstrip diplexer using open-loop resonators
In this paper, a new microstrip diplexer using open loop resonators with compact size and high isolation is designed and fabricated for the WLANs (IEEE 802.11b/g at 2.4 GHz and IEEE 802.11a at 5.2 GHz) applications. The diplexer is formed by two dual-mode band pass filters (BPFs) using an asymmetric fork-form feed line and two open loop resonators. The diple
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-12
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11. Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis
We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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12. Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis
We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06