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Search Results: 1 - 10 of 39 matches for " GianMario Besana "
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Criteria for very ampleness of rank two vector bundles over ruled surfaces
Alberto Alzati,GianMario Besana
Mathematics , 2009,
Abstract: Very ampleness criteria for rank 2 vector bundles over smooth, ruled surfaces over rational and elliptic curves are given. The criteria are then used to settle open existence questions for some special threefolds of low degree.
The dimension of the Hilbert scheme of special threefolds
GianMario Besana,Maria Lucia Fania
Mathematics , 2004,
Abstract: The Hilbert scheme of projective 3-folds of codimension 3 or more that are linear scrolls over the projective plane or over a smooth quadric surface or that are quadric or cubic fibrations over the projective line is studied. All known such threefolds of degree from 7 to 11 are shown to correspond to smooth points of an irreducible component of their Hilbert scheme, whose dimension is computed. A relationship with the locus of good determinantal subschemes is investigated
Strategies, Performances and Profiling of a Sample of U.S. Universities in 2012  [PDF]
Angela Besana, Annamaria Esposito
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.53008
Abstract: The global economic crisis is affecting performances of not-for-profits. At the same time donors are targeted by a pressing good-cause related marketing, so that the competition for philanthropy is particularly keen. U.S. universities can be public, not-for-profit and for-profit. U.S. not-for-profit universities are confronted with different marketing, fundraising and revenue diversification. Above all, marketing concerns customers and their segmentation and their purchasing-power exploitation; fundraising aims to gain the trustworthiness of donors, instead. The aim of this paper is the analysis of the revenue diversification of a sample of 100 U.S. not-for-profit universities according to IRS (Internal Revenue Service) Forms. These 100 U.S. universities had the highest 2012’s revenues for the Guidestar ranking (www.guidestar.org). The cluster analysis gives evidence that the highest gain and the highest solvency are both connected with the implementation of revenue diversification for one profile. The most crowded cluster is the Marketing Expert with the second highest gain.
Tourism as an Exit Strategy at Crisis Times  [PDF]
Angela Besana, Anna Maria Bagnasco
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.53009
Abstract: The contemporary crisis is giving evidence of failing macroeconomic theories and policies, after decades of focusing on the aggregate domestic demand and the role of the public expenditure. The contemporary crisis has shown the weakness of fiscal policy. With very low interest rates, the monetary policy does not seem to provide an alternative exit strategy out of the crisis, too. In this paper we discuss the hypothesis that GDP can still be a reliable estimate of growth. Nevertheless, at crisis times, only if the focus is on the foreign demand like International Tourism Receipts and Exports, and Exports can be an exit strategy. One component of Exports and International Tourism Receipts are worthy of attention. Thanks to a cluster analysis of per year variations of International Tourism Receipts (ITRs), GDP and Exports (World Bank Database) from 2007 to 2011, average positive variations of GDPs are matching with positive ITRs and Exports for “clusters” of countries. Performances of Europe and USA are worse than China, Brazil, India and South Africa and these continents and countries are separated in two different clusters. This result can be related to an increase of trade in emerging economies more than in mature ones, whose exit out of the crisis is much more demanding. The research confirms that Tourism and Exports are having an impact on the growth at different intensities (Europe and America vs. Asia) at crisis times.
Codes, Horn's problem and Gromov-Witten invariants
Alberto Besana,Cristina Martinez
Mathematics , 2013,
Abstract: We study the Horn problem in the context of algebraic codes on a smooth projective curve defined over a finite field, reducing the problem to the representation theory of the special linear group $SL(2,F_q)$. We characterize the coefficients that appear in the Kronecker product of symmetric functions in terms of Gromov-Witten invariants of the Hilbert scheme of points in the plane. In addition we classify all the algebraic codes defined over the rational normal curve.
Enumerative geometry of the curves defined by y^{d}=f(x)
Alberto Besana,Cristina Martinez
Mathematics , 2011,
Abstract: We study plane algebraic curves defined over a field k of arbitrary characteristic as coverings of the the projective line and the problem of enumerating branched coverings of $\mathbb{P}^{1}$ by using combinatorial methods.
New gold catalysts for liquid phase oxidation
Laura Prati,Gianmario Martra
Gold Bulletin , 1999, DOI: 10.1007/BF03216617
Abstract: A pre-requisite for good catalytic activity with supported gold is that the metal is present as nanoparticles, but no suitable method for depositing gold on carbon as nanoparticles has previously been reported. The deposition precipitation method which has been used successfully for catalyst preparation with other supports, produces large aggregates with carbon. It is now shown, however, that pre-reduced gold sol is a satisfactory method for preparing gold on carbon catalysts as long as an appropriate choice of sol is made. In this paper the activity of gold on carbon catalysts prepared in a number of different ways is compared in a standardized liquid phase organic oxidation reaction. The activity for Au/C catalysts prepared by the sol method can show a two-fold increase compared with a similar catalyst prepared by deposition precipitation.
Well Posedness of Operator Valued Backward Stochastic Riccati Equations in Infinite Dimensional Spaces
Giuseppina Guatteri,Gianmario Tessitore
Mathematics , 2014,
Abstract: We prove existence and uniqueness of the mild solution of an infinite dimensional, operator valued, backward stochastic Riccati equation. We exploit the regularizing properties of the semigroup generated by the unbounded operator involved in the equation. Then the results will be applied to characterize the value function and optimal feedback law for a infinite dimensional, linear quadratic control problem with stochastic coefficients.
Integrated Mobility: A Research in Progress  [PDF]
Gianmario Motta, Antonella Ferrara, Daniele Sacco, Linlin You, Gianpaolo Cugola
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.63B021
Abstract: We here present an ongoing research project about an integrated real time mobility assistant, which has been developed for the call “Personal Integrated Mobility” of the EU framework program. The assistant is aimed to support personal mobility in a near future scenario, where green, shared or public transports are replacing the current private, carbon transportation system. The assistant handles itineraries, which are based on goals of time, energy/pollution and cost, and supports users both before and during the trip. The service will gather and interpret any relevant source of information on transport resources and their availability. Information includes user generated content and social data. Given the globalization of users and the hourly peaks of mobility, the assistant is a cloud service, which integrates existing technologies; however a global extension requires a federation of clouds and, above all, the interpretation and validation of social data. These can be considered major research challenges.
Some remarks on cyclic Galois coverings of the projective line over finite fields
Alberto Besana,Cristina Martinez Ramirez
Mathematics , 2012,
Abstract: We study cyclic finite Galois extensions of the rational function field of the projective line P^{1}(F_q) over a finite field F_q with q elements defined by considering quotient curves by finite subgroups of the projective linear group PGL(2,q), and we enumerate them expressing the count in terms of Stirling numbers.
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