Sine Wave Model
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Characterization of noise emitted by a power tiller through geostatistics
RESUMO O ruído é um dos agentes físicos nocivos e estressantes presente no ambiente de trabalho. Pesquisas realizadas com a geoestatistica para ajuste de semivariograma de ruído de tratores foram feitos por meio do modelo gaussiano e esférico. Dessa forma, objetivou-se mapear a variabilidade espacial do ruído emitido por um trator de rabiça, por meio
Rev. bras. eng. agríc. ambient.. Publicado em: 2019-03
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2. Dorsal periaqueductal gray stimulation facilitates anxiety-, but not panic-related, defensive responses in rats tested in the elevated T-maze
The escape response to electrical or chemical stimulation of the dorsal periaqueductal gray matter (DPAG) has been associated with panic attacks. In order to explore the validity of the DPAG stimulation model for the study of panic disorder, we determined if the aversive consequences of the electrical or chemical stimulation of this midbrain area can be dete
Braz J Med Biol Res. Publicado em: 2012-11
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3. Estudo e Aperfeiçoamento do Vocoder de Transformada Senoidal
The basic sinusoidal analysis/synthesis system is presented and recent parameters codification techniques are studied. In addition, new methods for improving the speech quality of Sinusoidal Transform Vocoders at 2,4 and 4,8 Kbps are presented. One of them is a refinement in the pitch estimation, since pitch accuracy is essential for the efficiency of the ha
Publicado em: 2004
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4. Estudo da resposta dinamica de uma locomotiva a excitações devidas a irregularidades da via
This work presents a theoretical analysis of the dynamic behavior of locomotives on straight tracks. A mathematical model with thirty-nine degrees of freedom is developed and eingenvalues and eigenvectors, natural frequencies and dominant motions are determined. The excitation forces include vertical and lateral directions track irregularities, which are rep
Publicado em: 1987
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5. Influence of changing temperature on growth rate and competition between two psychrotolerant Antarctic bacteria: competition and survival in non-steady-state temperature environments.
Competition between two psychrotolerant bacteria was examined in glycerol-limited chemostat experiments subjected to non-steady-state conditions of temperature. One bacterium, a Brevibacterium sp. strain designated CR3/1/15, responded rapidly to temperature change, while a second, Hydrogenophaga pseudoflava, designated CR3/2/10, exhibited a lag in growth aft
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6. Visual cortical input alters spatial tuning in monkey lateral geniculate nucleus cells.
The response of monkey lateral geniculate nucleus (l.g.n.) cells to flashing spots, annuli, and drifting sine-wave gratings were recorded with tungsten micro-electrodes. These stimuli were presented (a) monocularly, through an aperture in the centre of a radial grating, or (b) dichoptically, in which the spots or drifting gratings were presented to the domin
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7. The dynamics of the cat retinal Y cell subunit.
1. The dynamics of the subunit mechanism of individual cat Y retinal ganglion cells are investigated. In order to isolate the response of the non-linear subunit mechanism, the visual stimuli were sine gratings of a spatial frequency sufficiently high so that contrast reversal of the grating elicited no fundamental response in any spatial phase. For study of
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8. Signal transduction across alamethicin ion channels in the presence of noise.
We have studied voltage-dependent ion channels of alamethicin reconstituted into an artificial planar lipid bilayer membrane from the point of view of electric signal transduction. Signal transduction properties of these channels are highly sensitive to the external electric noise. Specifically, addition of bandwidth-restricted "white" noise of 10-20 mV (r.m