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Linearly foliated Calabi-Yau n-folds I. First-order deformations
Antonio Ricco
Mathematics , 2007,
Abstract: We consider classes of noncompact n-folds with trivial canonical bundle, that are linear foliations on nonsingular projective varieties, in general without a projection to the base. We obtain them as first-order deformations of total spaces of vector bundles on those varieties.
Brane superpotential and local Calabi-Yau manifolds
Antonio Ricco
Mathematics , 2008, DOI: 10.1142/S0217751X08040780
Abstract: We briefly report on some recent progress in the computation of B-brane superpotentials for Type II strings compactified on Calabi-Yau manifolds, obtained by using a parametrization of tubular neighborhoods of complex submanifolds, also known as local spaces. In particular, we propose a closed expression for the superpotential of a brane on a genus-g curve in a Calabi-Yau threefold in the case in which there exists a holomorphic projection from the local space around the curve to the curve itself.
Hepatitis B virus and Homo sapiens proteomewide analysis: A profusion of viral peptide overlaps in neuron-specific human proteins
Rosalia Ricco, Darja Kanduc
Biologics: Targets and Therapy , 2010, DOI: http://dx.doi.org/10.2147/BTT.S8890
Abstract: titis B virus and Homo sapiens proteomewide analysis: A profusion of viral peptide overlaps in neuron-specific human proteins Original Research (4699) Total Article Views Authors: Rosalia Ricco, Darja Kanduc Published Date April 2010 Volume 2010:4 Pages 75 - 81 DOI: http://dx.doi.org/10.2147/BTT.S8890 Rosalia Ricco1, Darja Kanduc2 1Department of Pathological Anatomy, 2Department of Biochemistry and Molecular Biology, University of Bari, Bari, Italy Abstract: The primary amino acid sequence of the hepatitis B virus (HBV) proteome was searched for identity spots in the human proteome by using the Protein Information Resource database. We find that the HBV polyprotein shares sixty-five heptapeptides, one octapeptide, and one nonapeptide with the human proteins. The viral matches are disseminated among fundamental human proteins such as adhesion molecules, leukocyte differentiation antigens, enzymes, proteins associated with spermatogenesis, and transcription factors. As a datum of special interest, a number of peptide motifs are shared between the virus- and brain-specific antigens involved in neuronal protection. This study may help to evaluate the potential cross reactions and side effects of HBV antigen-based vaccines.
Km2 vs km of sovereignty in the Lebanese public space: The Shi’ite community, Hezbollah and forms of dissidence within the community territory
Massimo Di Ricco
Revista CIDOB d'Afers Internacionals , 2010,
Abstract: An analysis of the Lebanese public space must be linked to the very configuration of its political system, either in terms of geographical space or in political or social terms. The aim of this article –which considers the case of the Shi’ite community– is to highlight, on one hand, the informal character of community public space in Lebanon, and on the other, to shed light on the role of the individual within it. The community and the public space is analysed here from a perspective that takes into consideration the cases of dissent and freedom of expression within a space which is normally excluded from public debate. The case of the Shi’ite community (and in particular of Hezbollah’s space) exemplifies a specific anomaly that at the same time represents a general tendency among all Lebanese communities. Such an anomaly, especially in times of severe internal political tension, leads to an informal division of the national territory between the different Lebanese communities, which are influenced by informal communal leaders, and this makes it difficult for individuals to freely express their ideas within such a space.
Hepatitis B virus and Homo sapiens proteomewide analysis: A profusion of viral peptide overlaps in neuron-specific human proteins
Rosalia Ricco,Darja Kanduc
Biologics: Targets and Therapy , 2010,
Abstract: Rosalia Ricco1, Darja Kanduc21Department of Pathological Anatomy, 2Department of Biochemistry and Molecular Biology, University of Bari, Bari, ItalyAbstract: The primary amino acid sequence of the hepatitis B virus (HBV) proteome was searched for identity spots in the human proteome by using the Protein Information Resource database. We find that the HBV polyprotein shares sixty-five heptapeptides, one octapeptide, and one nonapeptide with the human proteins. The viral matches are disseminated among fundamental human proteins such as adhesion molecules, leukocyte differentiation antigens, enzymes, proteins associated with spermatogenesis, and transcription factors. As a datum of special interest, a number of peptide motifs are shared between the virus- and brain-specific antigens involved in neuronal protection. This study may help to evaluate the potential cross reactions and side effects of HBV antigen-based vaccines.Keywords: HBV proteome, human proteome, similarity analysis, viral versus human proteome overlapping, vaccine-related cross-reactions
The laminar generalized Stokes layer and turbulent drag reduction
Maurizio Quadrio,Pierre Ricco
Physics , 2010, DOI: 10.1017/S0022112010004398
Abstract: This paper considers plane channel flow modified by waves of spanwise velocity applied at the wall and travelling along the streamwise direction. Laminar and turbulent regimes for the streamwise flow are both studied. When the streamwise flow is laminar, it is unaffected by the spanwise flow induced by the waves. This flow is a thin, unsteady and streamwise-modulated boundary layer that can be expressed in terms of the Airy function of the first kind. We name it the generalized Stokes layer because it reduces to the classical oscillating Stokes layer in the limit of infinite wave speed. When the streamwise flow is turbulent, the laminar generalized Stokes layer solution describes well the space-averaged turbulent spanwise flow, provided that the phase speed of the waves is sufficiently different from the turbulent convection velocity, and that the time scale of the forcing is smaller than the life time of the near-wall turbulent structures. Under these conditions, the drag reduction is found to scale with the Stokes layer thickness, which renders the laminar solution instrumental for the analysis of the turbulent flow. A classification of the turbulent flow regimes induced by the waves is presented by comparing parameters related to the forcing conditions with the space and time scales of the turbulent flow.
Wall-oscillation conditions for drag reduction in turbulent channel flow
Pierre Ricco,Maurizio Quadrio
Physics , 2008,
Abstract: The drag reduction properties of a turbulent channel flow modified by spanwise sinusoidal oscillations of the walls are investigated by direct numerical simulations. The work is based on the linear relation between the drag reduction and the parameter $S$, function of the maximum wall velocity and the period of the oscillation. This quantity has been found through physical arguments pertaining to the action of the oscillating Stokes layer on the near-wall turbulence dynamics. The predictive potential of the scaling parameter is exploited to gain insight into the drag-reducing effects of the oscillating wall technique. The period of oscillation which guarantees the maximum drag reduction for a given maximum wall displacement is studied for the first time. The issue of the minimum intensity of wall forcing required to produce a non-zero drag reduction effect and the dependence of the drag reduction on the Reynolds number are also addressed. The drag reduction data available in the literature are compared with the prediction given by the scaling parameter, thus attaining a comprehensive view of the state of the art.
Longitudinal and transverse structure functions of proton and deuteron at large x
G. Ricco,S. Simula
Physics , 1998,
Abstract: Higher-twist effects in the low-order moments of the longitudinal and transverse structure functions of proton and deuteron have been analyzed using available phenomenological fits of existing data in the Q**2 range between 1 and 20 (GeV/c)**2. Both twist-4 and twist-6 contributions have been determined adopting the Natchmann definition of moments, which allows to disentangle properly target-mass effects. The extraction of the matrix elements of the relevant twist-4 operators, describing quark-quark and quark-gluon correlations, is carried out in case of the second moment. The need of transverse data with better quality for x > 0.5 and Q**2 < 10 (GeV/c)**2 as well as more precise and systematic determinations of the L/T separation make JLab @ 12 GeV a good place to improve our understanding of the non-perturbative structure of hadrons.
Normal bundles to Laufer rational curves in local Calabi-Yau threefolds
U. Bruzzo,A. Ricco
Mathematics , 2005, DOI: 10.1007/s11005-006-0057-7
Abstract: We prove a conjecture by F. Ferrari. Let X be the total space of a nonlinear deformation of a rank 2 holomorphic vector bundle on a smooth rational curve, such that X has trivial canonical bundle and has sections. Then the normal bundle to such sections is computed in terms of the rank of the Hessian of a suitably defined superpotential at its critical points.
Diretividade materna e socializa??o de crian?as com atraso de desenvolvimento
Sigolo, Silvia Regina Ricco Lucato;
Paidéia (Ribeir?o Preto) , 2000, DOI: 10.1590/S0103-863X2000000200007
Abstract: maternal directiveness is, usually, described as a uniform concept in literature and it has been causing a lot of discussion according to its implications to child development. this work tries to verify the presence of directive behavior on developmentally delayed children's mothers and the meaning of this variable in the interactive process of dyads mother - child. four pairs were observed in daily routine situations and also in free playing, during a twelve months period. the results show that, generally, the mothers are directive, although individual differences among the patterns were noticed. the children have show raising levels of opposition, reaching an apex around twenty-four months old. it was concluded that directiveness can be a variable that promotes children development according to its meaning in the mother-child relationship, but it cannot be the only responsible dimension for the quality of the maternal interactive stile.
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