Sub Band
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Introduction of Application of Gini Coefficient to Heart Rate Variability Spectrum for Mental Stress Evaluation
Resumo Fundamento: O coeficiente de Gini é um instrumento estatístico geralmente usado por economistas para quantificar a desigualdade de renda. No entanto, ele pode ser aplicado a qualquer tipo de dados com distribuição desigual, incluindo a variabilidade da frequência cardíaca (VFC). Objetivos: Avaliar a aplicação do coeficiente de Gini para medi
Arq. Bras. Cardiol.. Publicado em: 09/09/2019
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2. Polarization Insensitive Compact Wide Stop-band Frequency Selective Surface
Abstract A compact, polarization insensitive, wide stop band frequency selective surface is presented. The unit cell is designed by modifying the basic square loop FSS. The simulated value of bandwidth for transmission < ‒ 20 dB for TE incident wave is 7.7 GHz from 4.71 GHz to 12.41 GHz which is 89.95% corresponding to the center frequency of this range. I
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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3. Time course of changes in heart rate and blood pressure variability in rats with myocardial infarction
Our aim was to determine the time course of changes in autonomic balance in the acute (1 and 3 days), sub-acute (7 days) and chronic (28 days) phases of myocardial infarction (MI) in rats. Autonomic balance was assessed by temporal and spectral analyses of blood pressure variability (BPV) and heart rate variability (HRV). Pulsatile blood pressure (BP) record
Braz J Med Biol Res. Publicado em: 09/01/2017
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4. Luminescent Terbium Doped Aluminate Particles: Properties and Surface Modification with Asparagine
New luminescent organic-inorganic hybrid particles based on Tb-doped aluminates and asparagine (Asn) surface modifiers were investigated. The Tb3+ doped inorganic core was obtained by spray pyrolysis, at 200 ºC γ-AlOOH (BOE:Tbx%) or at 700 ºC γ-Al2O3 (γTA:Tbx%). The reaction of Asn with boehmite in water disaggregated the sub-micronic boehmite particles
J. Braz. Chem. Soc.. Publicado em: 2015-12
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5. Analysis of electronic structure of boron nitride nanotubes with different positions of intrinsic impurities
The pristine boron nitride nanotubes have a large direct band gap around 5 eV. This band gap can be engineered by doping. We investigate electronic structure of the doped hexagonal boron nitride (5,5) nanotubes using the linearized augmented cylindrical wave method. In particular, this work focuses on systematical study of the band gap and the density of sta
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-12
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6. Estudo de transistores de tunelamento controlados por efeito de campo. / Study of tunnel field effect transistors.
This works presents the study of tunneling field effect transistors, namely TFETs. Analyses were performed based on theoretical explanations, numerical simulations and experimental data in order to show this technology suitability as an alternative for the continuous devices scaling. The basic idea of making use of band-to-band tunneling as the main current
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2012
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7. Inversão sísmica para impedância acústica na caracterização de reservatórios : impacto da extração da wavelet e do aumento da banda de frequências / Seismic inversion to acoustic impedance in reservoir caracterization : the impact of wavelet extraction and increase the frequency band
The substrates that constitute a reservoir are identified using seismic data. The process consists of determining reservoir petrophysical properties. However, sub-seismic layers structures are masked due to the limitation of conventional seismic data. The failure provided by these data produces an erroneous model of reservoir. The lack of vertical resolution
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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8. INDEPENDENT TEXT ROBUST SPEAKER RECOGNITION IN THE PRESENCE OF NOISE USING PAC-MFCC AND SUB BAND CLASSIFIERS / RECONHECIMENTO DE LOCUTOR INDEPENDENTE DO TEXTO EM PRESENÇA DE RUÍDO USANDO PAC-MFCC E CLASSIFICADORES EM SUB-BANDAS
O presente trabalho é proposto o atributo PAC-MFCC operando com Classificadores em Sub-Bandas para a tarefa de identificação de locutor independente do texto em ruído. O sistema proposto é comparado com os atributos MFCC (Coeficientes Cepestrais de Frequência Mel), PAC- MFCC (Fase Autocorrelação-MFCC ) sem uso de classificadores em sub-bandas, SSCH(H
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/04/2011
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9. Preparation of nanodimensional CdS by chemical dipping technique and their characterization
A simple and cost effective chemical technique has been utilized to grow cadmium sulphide (CdS) nanoparticles at room temperature. The sample is characterized with XRD (X-ray diffractometer), SEM (Scanning electron microscope), TEM (Transmission electron microscope) and UV-VIS spectrophotometer. The particle size estimated using X-ray line broadening method
Materials Research. Publicado em: 01/04/2011
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10. ROBUST TEXT-INDEPENDENT SPEAKER IDENTIFICATION USING MULTIPLE CLASSIFIERS IN SUB-BANDS / IDENTIFICAÇÃO DE LOCUTOR ROBUSTA E INDEPENDENTE DO TEXTO USANDO MÚLTIPLOS CLASSIFICADORES EM SUB-BANDAS
Esta tese destina-se ao desenvolvimento de novas técnicas de combinação de classificadores aplicados em sub-bandas visando melhorar a identificação de locutor robusta e independente do texto. As vantagens observadas nas pesquisas utilizando múltiplos classificadores em sub-bandas para o reconhecimento de locutor robusto motivaram o desenvolvimento de t
Publicado em: 2010
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11. Chitinase Production by Streptomyces sp. ANU 6277
Chitinase production by a terrestrial Streptomyces sp. ANU 6277 was studied under sub-merged fermentation. Chitinase production started after 24 h of incubation and reached maximum levels after 60 h of cultivation. A high level of chitinase activity was observed in the culture medium with pH 6 at 35ºC. Culture medium amended with 1% chitin was found to be s
Brazilian Journal of Microbiology. Publicado em: 2009-12
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12. "Síntese e Estudos Espectroscópicos dos Compostos Envolvendo Metais Divalentes (Mn, Co, Ni, Cu, Zn) Contendo o Ligante Nitrogenado 1,3-bis (4-piridil) propano e o Íon Esquarato"
This work deals with the synthesis, specteroscopic characterization and crystal structure determination of coordination polymers formed by the interaction between squarate ion, 1,3-bis(4-pyridil)propane (BPP) and several transition metal ions (Mn2+, Co2+, Ni2+, Cu2+ e Zn2+). Eleven compounds have been obtained, and ten are new ones; from these new compounds,
Publicado em: 2007