Sine Wave
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. Combined influence of illness duration and medication type on visual sensitivity in schizophrenia
Objective: Patients with schizophrenia have visual processing impairments. The main findings from the literature indicate that these deficits may be related to differences in paradigms, medications, and illness duration. This study is part of a large-scale study investigating visual sensitivity in schizophrenia. Here we aimed to investigate the combined eff
Braz. J. Psychiatry. Publicado em: 2020-02
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2. Combined influence of illness duration and medication type on visual sensitivity in schizophrenia
Objective: Patients with schizophrenia have visual processing impairments. The main findings from the literature indicate that these deficits may be related to differences in paradigms, medications, and illness duration. This study is part of a large-scale study investigating visual sensitivity in schizophrenia. Here we aimed to investigate the combined eff
Braz. J. Psychiatry. Publicado em: 01/07/2019
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3. 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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4. Ultrasonic method of microvibration detection: part II - additional processing method and applications
Abstract Introduction In the last 28 years, the scientific community has been using elastography to evaluate the mechanical properties of biological tissue. The aim of this work was the optimization of the UDmV method, presented in Part I of the series, by means of modifying the technique employed to generate the reference sine and cosine functions, used fo
Res. Biomed. Eng.. Publicado em: 17/08/2017
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5. Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions
The aim of this study was to assess contrast sensitivity for angular frequency stimuli as well as for sine-wave gratings in adults under the effect of acute ingestion of alcohol. We measured the contrast sensitivity function (CSF) for gratings of 0.25, 1.25, 2.5, 4, 10, and 20 cycles per degree of visual angle (cpd) as well as for angular frequency stimuli o
Braz J Med Biol Res. Publicado em: 21/03/2014
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6. Differential effects of aging on spatial contrast sensitivity to linear and polar sine-wave gratings
Changes in visual function beyond high-contrast acuity are known to take place during normal aging. We determined whether sensitivity to linear sine-wave gratings and to an elementary stimulus preferentially processed in extrastriate areas could be distinctively affected by aging. We measured spatial contrast sensitivity twice for concentric polar (Bessel) a
Braz J Med Biol Res. Publicado em: 02/10/2013
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7. 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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8. Exact travelling wave solutions for some nonlinear (N+1)-dimensional evolution equations
In this paper, we implement the tanh-coth function method to construct the travelling wave solutions for (N + 1)-dimensional nonlinear evolution equations. Four models, namely the (N + 1)-dimensional generalized Boussinesq equation, (N + 1)-dimensional sine-cosine-Gordon equation, (N + 1)-double sinh-Gordon equation and (N + 1)-sinh-cosinh-Gordon equation, a
Comput. Appl. Math.. Publicado em: 2012
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9. Visual contrast sensitivity in tonic-clonic epileptic patients
We measured the effects of epilepsy on visual contrast sensitivity to linear and vertical sine-wave gratings. Sixteen female adults, aged 21 to 50 years, comprised the sample in this study, including eight adults with generalized tonic-clonic seizure-type epilepsy and eight age-matched controls without epilepsy. Contrast threshold was measured using a tempor
Psychology & Neuroscience. Publicado em: 2011-06
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10. Impairment of color spatial vision in chronic alcoholism measured by psychophysical methods
We used psychophysical tests to evaluate spatial vision in 15 subjects with a clinical history of chronic alcoholism by measuring luminance contrast sensitivity and color discrimination. The subjects were initially subjected to clinical inquiry and ophthalmological exam. Subjects then performed psychophysical tests to measure spatial contrast thresholds usin
Psychology & Neuroscience. Publicado em: 2009-12
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11. Contrast sensitivity function of sine-wave gratings in children with acute malnutrition
The aim of this study was to determine the contrast sensitivity curves of sine-wave gratings with spatial frequencies of 0.25, 1.0, 2.0 and 8.0 cycles per degree (cpd) of visual angle in 16 female subjects aged 7 to 9 years old, eight well-nourished and eight with acute protein-energy malnutrition (PEM). All participants had normal visual acuity and were fre
Psychology & Neuroscience. Publicado em: 2009-06
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12. Exact solutions and conservation laws for Ibragimov-Shabat equation which describe pseudo-spherical surface
Travelling wave solution for Ibragimov-Shabat equation, is obtained by using an improved sine-cosine method and the Wu's elimination method. An infinite number of conserved quantities for the above equation are also obtained by solving a set of coupled Riccati equations.
Computational & Applied Mathematics. Publicado em: 2008