G.D. Sergiadis

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A main concern for the documentation of artworks (such as paintings, miniatures, icons, manuscripts, wall paintings) is how to reveal the information that stems from the internal paint layers (stratigraphy). This information is up to now mainly acquired through analytical spectroscopic methods which require a micro-sampling operation. In the majority of the(More)
This paper presents the nondestructive stratigraphy determination through the use of UV/VIS/nIR spectroscopy. The UV/VIS/nIR backscattered light through a multilayered structure, such as the paint layers of artworks, is simulated. The device used to produce and measure the backscattered light, is the Perkin-Elmer Lambda 900 UV/VIS/nIR spectrophotometer(More)
Motion estimation in the spatiotemporal domain has been extensively studied and many methodologies have been proposed, which, however, cannot handle both time-varying and multiple motions. Extending previously published ideas, we present an efficient method for estimating multiple, linearly time-varying motions. It is shown that the estimation of(More)
A single-channel alternative detection system for magnetic resonance imaging and spectroscopy experiments is presented. After the phase error identification, which is realized through a simple method, one can correct the reconstructed image and discriminate between positive and negative frequencies without any loss of the S/N ratio. Since there is only one(More)
Whole-body NMR imaging antennas (probes) are strongly affected by the inevitable magnetic and controllable dielectric losses. Using a convenient parallelepiped model, the magnetic losses are evaluated. By introducing the "ideal power gain," the best possible antenna performance is delimited as a function of the frequency and the patient examined. By using a(More)
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