Circular Apertures
Mostrando 1-6 de 6 artigos, teses e dissertações.
-
1. Processing, radiometric correction, autofocus and polarimetric classification of circular SAR data.
The demand for high resolution SAR systems and also for imaging techniques to retrieve scene information on the third dimension have stimulated the development of new acquisition modes and processing approaches. This work studies one of the newest SAR acquisition modes being used, namely the Circular SAR, in which the platform follows a non-linear circular t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/10/2010
-
2. Processing, radiometric correction, autofocus and polarimetric classification of circular SAR data.
The demand for high resolution SAR systems and also for imaging techniques to retrieve scene information on the third dimension have stimulated the development of new acquisition modes and processing approaches. This work studies one of the newest SAR acquisition modes being used, namely the Circular SAR, in which the platform follows a non-linear circular t
Publicado em: 2010
-
3. ANÁLISE DO FATOR DE REDUÇÃO DE GANHO PARA ABERTURAS CIRCULARES SITUADAS EM REGIÃO DE FRESNEL / ANALYSIS OF GAIN REDUCTION FACTOR FOR CIRCULAR APERTURES LOCATED IN THE FRESNEL REGION
The following work analyzes the problem of gain reduction between circular apertures located in the Fresnel region, and aims to determine the correction factor to be applied when measuring near field gains. Two different sets of aperture illumination forms are presented, for which sets of tables of the reduction factor as well as the corresponding curves hav
Publicado em: 1976
-
4. Spatial attention affects brain activity in human primary visual cortex
Functional MRI was used to test whether instructing subjects to attend to one or another location in a visual scene would affect neural activity in human primary visual cortex. Stimuli were moving gratings restricted to a pair of peripheral, circular apertures, positioned to the right and to the left of a central fixation point. Subjects were trained to perf
The National Academy of Sciences.
-
5. Time-dependent diffusion in tubes with periodic partitions
The presence of obstacles leads to a slowdown of diffusion. We study the slowdown when diffusion occurs in a tube, and obstacles are periodically spaced identical partitions with circular apertures of arbitrary radius in their centers. The mean squared displacement of a particle diffusing in such a system at large times is given by ⟨Δx2(t)⟩=2Defft, t→
American Institute of Physics.
-
6. Comparison of Spatial Summation Properties of Neurons in Macaque V1 and V2
In visual cortex, responses to stimulation of the receptive field (RF) are modulated by simultaneous stimulation of the RF surround. The mechanisms for surround modulation remain unidentified. We previously proposed that in the primary visual cortex (V1), near surround modulation is mediated by geniculocortical and horizontal connections and far surround mod
American Physiological Society.