1,404 research outputs found
Intersections of the Hermitian Surface with irreducible Quadrics in even Characteristic
We determine the possible intersection sizes of a Hermitian surface with an irreducible quadric of sharing at least a
tangent plane at a common non-singular point when is even.Comment: 20 pages; extensively revised and corrected version. This paper
extends the results of arXiv:1307.8386 to the case q eve
Intersections of the Hermitian surface with irreducible quadrics in , odd
In , with odd, we determine the possible intersection sizes of
a Hermitian surface and an irreducible quadric
having the same tangent plane at a common point .Comment: 14 pages; clarified the case q=
Intersection sets, three-character multisets and associated codes
In this article we construct new minimal intersection sets in
sporting three intersection numbers with hyperplanes; we
then use these sets to obtain linear error correcting codes with few weights,
whose weight enumerator we also determine. Furthermore, we provide a new family
of three-character multisets in with even and we
also compute their weight distribution.Comment: 17 Pages; revised and corrected result
Construction of a 3-Dimensional MDS code
In this paper, we describe a procedure for constructing --ary
--MDS codes, of length (for odd) or (for
even), using a set of non--degenerate Hermitian forms in .Comment: 8 Pages Minor typesetting changes; dedicatio
Progetto SI.MON.A-MAV: sviluppo e sperimentazione delle leggi di controllo del volo di un mini UAV per il monitoraggio del territorio
Lo sviluppo di velivoli senza pilota (UAV) per lâimpiego civile Ăš da tempo oggetto di ricerca presso il laboratorio di Meccanica del Volo del Dipartimento di Ingegneria Aerospaziale della UniversitĂ di Pisa.
La presente tesi si propone di mostrare i recenti risultati dellâattivitĂ sperimentale svolta presso il suddetto laboratorio nellâambito del progetto SI.MON.A-MAV, avente come obiettivo la messa a punto di un sistema per il monitoraggio del territorio basato sullâutilizzo di un mini UAV.
Tali attivitĂ hanno riguardato lo sviluppo e la sperimentazione di un sistema di controllo automatico del volo del velivolo, il quale Ăš caratterizzato da una configurazione fortemente innovativa che gli consente la capacitĂ di effettuare sia il volo a punto fisso (hovering) sia il volo traslato convenzionale.
La funzionalitĂ del sistema di controllo Ăš stata inizialmente testata attraverso lâuso del toolbox Simulink di Matlab interfacciandolo con un simulatore di volo open source (FlightGear) con il quale Ăš stata studiata anche la dinamica del volo del velivolo.
Successivamente una campagna di prove sperimentali ha consentito di verificare il funzionamento dei vari autopiloti ed ha dimostrato lâeffettiva capacitĂ di hovering del mini UAV
A characterization of Hermitian varieties as codewords
It is known that the Hermitian varieties are codewords in the code defined by
the points and hyperplanes of the projective spaces . In finite
geometry, also quasi-Hermitian varieties are defined. These are sets of points
of of the same size as a non-singular Hermitian variety of
, having the same intersection sizes with the hyperplanes of
. In the planar case, this reduces to the definition of a unital. A
famous result of Blokhuis, Brouwer, and Wilbrink states that every unital in
the code of the points and lines of is a Hermitian curve. We prove
a similar result for the quasi-Hermitian varieties in , ,
as well as in , prime, or , prime, and
Quasi--Hermitian varieties in PG(r,q^2), q even
In this paper a new example of quasi--Hermitian variety \cV in , an odd power of , is provided. In higher-dimensional spaces \cV can be viewed as a generalization of the Buekenhout-Tits unital in the desarguesian projective plane; see \cite{GE2}
Direct Selling: a Marketing Strategy to Shorten Distances between Production and Consumption
Direct sales became in recent years a diversification strategy increasingly used by farms to answer the CAP reform, as well as to react to the continuous price squeeze. Direct sales is in fact a form of marketing that allow farmers to retain a higher share of the final value of products. Far from being a way back to tradition, short chains and direct sales can be seen as strategies to capture new segments of demand interested in local and fresh food, and in more direct contact between consumers and suppliers. The aim of this work is to study the recent evolution of direct selling in Italy and the determinants of the adoption of this marketing strategy. The first part of the paper analyses the evolution of Italian short supply chains and the development of the related institutional framework (national laws and financial incentives). In the second part of the paper the analysis is focused on the determinants of the adoption of direct selling. Specific attention will be devoted to empirically test if the probability of using of this marketing channel is influenced by the farm location in proximity to urban areas.farm diversification, direct selling, short supply chain, periurban agriculture, discrete choice models, Marketing,
-Intersection sets in and two-character multisets in
In this article we construct new minimal intersection sets in
with respect to hyperplanes, of size and multiplicity , where
rt \in \ q^2r-3-q^(3r-4)/2, q^2r-3-q^r-2\rqPG(3,q^2)AG(r,q^2)$ satisfying the opposite of the algebraic conditions required in [1]
for quasi--Hermitian varieties
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