Distribució territorial dels registres de falcó marí Falco eleonorae a Mallorca

s’han recopilat fins a 342 registres de falcó marí Falco eleonorae que impliquen 5.146 exemplars dins el període 1984-2010. De mitjana l’arribada dels falcons es va situar el 12 d’abril i la darrera observació el 28 d’octubre. Les concentracions de falcons a certs punts tenen a veure amb comportaments alimentaris. Les majors concentracions registrades van ser al Parc Natural de s’Albufera de Mallorca i a son Bosc. Aquestes concentracions tengueren una marcada estacionalitat estival. La població de les Illes Balears podria representar entre el 5 i el 13 % de la població europea.A synthesis of 342 Eleonora’s falcon Falco eleonorae registrations produced a total of 5,146 birds for the period 1984-2010. Mean first arrival date was 12th April and the latest observation 28th October. Concentrations of falcons at certain sites were related to feeding activities. The largest recorded gatherings were at the Parc Natural de s’Albufera de Mallorca and at son Bosc. These gatherings had a marked summer seasonality. The Balearic population may represent between 5 and 13 % of the European population

Partial-Matching and Hausdorff RMS Distance Under Translation: Combinatorics and Algorithms

We consider the RMS distance (sum of squared distances between pairs of points) under translation between two point sets in the plane, in two different setups. In the partial-matching setup, each point in the smaller set is matched to a distinct point in the bigger set. Although the problem is not known to be polynomial, we establish several structural properties of the underlying subdivision of the plane and derive improved bounds on its complexity. These results lead to the best known algorithm for finding a translation for which the partial-matching RMS distance between the point sets is minimized. In addition, we show how to compute a local minimum of the partial-matching RMS distance under translation, in polynomial time. In the Hausdorff setup, each point is paired to its nearest neighbor in the other set. We develop algorithms for finding a local minimum of the Hausdorff RMS distance in nearly linear time on the line, and in nearly quadratic time in the plane. These improve substantially the worst-case behavior of the popular ICP heuristics for solving this problem.Comment: 31 pages, 6 figure

Cross-connection management specialisation for WDM-OTN's

WDM optical transport networks (WDM-OTN) will use new all-optical nodes that will perform functions in the optical domain, using wavelength as a new network resource. This paper presents a new approach for the optical cross-connect (OXC) routing operation that takes into account a diminished connection capability.Peer ReviewedPostprint (published version

Maths Quiz 2000 : la història d'un repte

En el precís instant en què les busques electròniques dels rellotges d'Internet assenyalaven les 12.00 de temps mitjà de Greenwich del dia 4 de desembre de l'any 2000, centenars de matemàtics d'arreu del món afrontaven un repte que havia de durar vint-i-quatre hores ininterrompudes. En les seves pantalles apareixia una pregunta com, per exemple, aquesta: Trobeu el màxim valor de n tal que tota n-varietat compacta tancada i orientable és la vora d'alguna n 1-varietat orientable. Això era l'inici del Maths Quiz 2000, una competició internacional de caràcte

Contribution to the knowledge of the flora and fauna of the sea bed of Cala Rafeubetx (SW of Mallorca, Balearic Islands)

Abstract not availabl

La indústria en sílex del jaciment a l'aire lliure de la zona del rafal des Porcs - cova des Drac

[spa] Se describe la industria en sílex encontrada en el yacimiento al aire libre de los alrededores de la “Cova des Drac” (Santanyi, Mallorca). El estudio de la misma permite atribuirla a la fase cultural más antigua de Mallorca, al parecer precerámica[eng] A description of the flint industry found in the open-air deposit in the vicinity of Cova des Drac (Santanyi, Mallorca) is presented. lnvestigation permits the attribution of this site to the earliest cultural period of Mallorca, apparently pre-cerami

Limit cycles bifurcating from a perturbed quartic center

Agraïments: The first and third authors are partially supported by the grant TIN2008-04752/TI