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Three realisations of 35 GHz reflectarrays with fixed beam are presented. The first single-layered reflectarray uses variable patches as phase-shifting element and serves as reference. The second one, employing patches of variable size loaded with variable length slots in the ground plane, and the third one, a double-layered reflectarray using stacked patches of variable size, are designed to achieve...
We present the state of the time and frequency program in development in Brazil. This contribution concerns the last progresses obtained with the atomic fountain (Magalhaes et al., 2004)
This paper investigates the application of a knowledge-based approach, founded on semantic networks, to the automatic land use mapping assisted by low resolution satellite images. Like the visual photo-interpretation, the automatic image interpretation considers scene and sensors knowledge, delivered by an expert photo-interpreter, as well as additional information about the region like the digital...
An integrated CMOS image acquisition system suitable for retinal information processing in bionic vision systems or product inspection has been developed and tested. It supports the readout of arbitrarily user-defined subregions. The test chip incorporates 32??32 random addressable active sensor cells arranged on a hexagonal grid and on-chip control and readout electronics. It has been designed and...
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