Recovery Of Signals
Mostrando 1-12 de 101 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. BIODEGRADACION FUNGICA DE POLIURETANO RÍGIDO
Polyurethane (PU) is one of the most widely used polymer materials. This generates a serious environmental problem because of its poor biodegradability since most of the native microorganisms cannot use it as a source of nutrients. Several techniques involving mechanical and chemical processes have been used for its recovery and reuse; however, the problem o
Quím. Nova. Publicado em: 2017-09
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3. Determination of Hg in Biological Samples and Ethanol Fuel by Photochemical Vapor Generation after Pre-Concentration in a Gold Trap
In this work, the photochemical vapor generation (PVG) coupled with atomic absorption spectrometry and a pre-concentration step with an Au column was used for the determination of Hg in biological samples and ethanol fuel. PVG with pre-concentration showed an up to 250-fold higher sensitivity compared to the approach without pre-concentration. The accuracy o
J. Braz. Chem. Soc.. Publicado em: 2017-09
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4. Simulação de sinais de RMN através das equações de Bloch
The aim of this paper was to present a simple and fast way of simulating Nuclear Magnetic Resonance signals using the Bloch equations. These phenomenological equations describe the classical behavior of macroscopic magnetization and are easily simulated using rotation matrices. Many NMR pulse sequences can be simulated with this formalism, allowing a quantit
Quím. Nova. Publicado em: 2014
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5. Protein turnover, amino acid requirements and recommendations for athletes and active populations
Skeletal muscle is the major deposit of protein molecules. As for any cell or tissue, total muscle protein reflects a dynamic turnover between net protein synthesis and degradation. Noninvasive and invasive techniques have been applied to determine amino acid catabolism and muscle protein building at rest, during exercise and during the recovery period after
Braz J Med Biol Res. Publicado em: 2012-10
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6. Analysis of signal processing techniques for optical 112 Gb/s DP-QPSK receivers with experimental data
This paper evaluates several signal processing techniques for optical dual-polarization quadrature phase-shift keying (DP-QPSK) coherent receivers, using offline post-processing of experimental data. In addition to electronically separating the two polarization multiplexed signals, the investigated signal processing algorithms also compensate for chromatic d
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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7. Polyethylene glycol and polyvinylpirrolidone effect on bacterial rRNA extraction and hybridization from cells exposed to tannins.
In order to detect fluctuations in ruminal microbial populations due to forage tannins using 16S ribosomal RNA (rRNA) probes, recovery of intact rRNA is required. The objective of this work was to evaluate the effect of polyethylene glycol (PEG) and polyvinylpirrolidone (PVP) on extraction of bacterial rRNA, in the presence of tannins from tropical legume fo
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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8. Espectrometria de absorção atômica como ferramenta analítica para determinação de elementos traço em biodiesel
In this work some procedures were developed for the determination of Na, K, Ca, Mg and P in biodiesel samples using atomic absorption spectrometry as an analytical tool. The determination of Na, K, Ca and Mg in biodiesel samples was performed using the technique of flame atomic absorption spectrometry (F AAS) and microemulsion as sample preparation. The opti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/04/2010
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9. Expressão gênica e protéica do canal de cálcio do tipo L e seu envolvimento com o mecanismo de secreção de insulina em ilhotas de langerhans de ratos submetidos à restrição protéica e suplementados com leucina / Gene and protein expression of L type calcium channel and your involvement in the mechanism of insulin secretion in islets of Langerhans of rats submitted to protein restriction and supplementation with leucine
Voltage-dependent calcium channels (CaV) are plasma membrane proteins that lead calcium, and are activated by depolarization of the same by promoting the influx of this ion, which serves as an intracellular second messenger, turning electrical signals into chemical. This process controls several intracellular events such as exocytosis, endocytosis, muscle co
Publicado em: 2010
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10. Estimation of parameters of signals generated by time invariant linear systems / Estimação de parâmetros de sinais gerados por sistemas lineares invariantes no tempo
A study on the recovery of signals modeled by weighted sums of complex exponentials complex is presented. For this, basic concepts of signals and systems theory are introduced. In particular, the linear time invariant systems (LTI Systems) are considered, which can be mathematically represented by differential equations or difference equations, respectively,
Publicado em: 2009
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11. Development and implantation of an operational setup designed for the evaluation of new tracers for oil reservoir characterization / Desenvolvimento e inplantação de um sistema operacional para a qualificação do desempenho de novos traçadores para reservatórios de petróleo
Petroleum, nowadays, is one of the most important natural resources in the world, since it is one of the main primary sources of energy and also raw material for many different products. It can be found accumulated in the subsoil, and was produced from the remaining portions of animals and vegetables, in a process that took millions of years to be concluded.
Publicado em: 2008
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12. Sobre equalizadores autodidatas de decisão realimentada aplicados a sistemas multiusuário
Due to the growing demand for mobile communications, adaptive equalizers play an important role for enhancing the efficiency of data transmission. In this scenario, the Decision Feedback Equalizer (DFE) stands out. It presents a favorable tradeoff between computational cost and efficient behavior, mainly when compared to Linear Transversal Equalizer. In this
Publicado em: 2007