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The Petrov classification is studied with the language of spacetime
splitting with respect to a generic timelike unit vector field. Canonical
forms of the Weyl tensor for each Petrov type are introduced in terms of
preferred reference frames. As an application, the canonical forms of the
Bel-… |
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We consider a simple discrete model for screw dislocations in crystals. Using a variational discrete scheme we study the motion of a configuration of dislocations toward low energy configurations. We deduce an effective fully overdamped dynamics that follows the maximal dissipation criterion… |
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Premixed combustion modes in compression ignition engines
are studied as a promising solution to meet fuel economy and
increasingly stringent emissions regulations. Nevertheless,
PCCI combustion systems are not yet consolidated enough
for practical applications. The high complexity of such… |
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Using the simulated annealing technique we re-examine the role played by the minimization of the physicochemical distances between amino acids during the origin of the organization of the genetic code. The results are discussed in the context of the various hypotheses proposed to explain how amino… |
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We introduce a nonparametric method for discriminant analysis based on
the search of independent components in a signal (ICDA). Keypoints of
the method are reformulation of the classification problem in terms of transform matrices; use of Independent Component Analysis (ICA) to choose a transform… |
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Purpose: This study aimed to describe a multisystemic disorder featuring cardiovascular, facial, musculoskeletal, and cutaneous anomalies caused by heterozygous loss-of-function variants in TAB2.
Methods: Affected individuals were analyzed by next-generation technologies and genomic array. The… |
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The segmentation of speckled images, as the synthetic aperture radar (SAR) images, is usually recognized as a very complex problem, because of the speckle, multiplicative noise, which produces granular images. In segmentation problems, based on level set method, the evolution of the curve is… |
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Certain notions concerning physical frames
thought as geometrical support of
continuous systems are discussed; from these notions, independently from the continuum dynamics, the Cauchy problem for the
first order characteristics of the frame, as well as the associated (involutive) compatibility… |
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By coupling the wavelet transform with a particular
nonlinear shrinking function, the Red-telescopic optimal
wavelet estimation of the risk (TOWER) method is introduced for
removing noise from signals. It is shown that the method yields
convergence of the L2 risk to the actual solution with optimal… |
