Canibalismo neonatal en conejos silvestres (Oryctolagus cuniculus) alojados en jaula

El objetivo de este estudio fue analizar la práctica de canibalismo neonatal por conejas silvestres (Oryctolagus cuniculus) alojadas individualmente en jaulas ubicadas al aire libre. Se controló la incidencia de canibalismo en 98 partos producidos durante cinco años consecutivos por 19 conejas silvestres nacidas en jaula. Esta alteración de la conducta maternal, que estuvo limitada exclusivamente al periparto, tuvo una elevada incidencia (13,3% de los partos) y estuvo asociada significativamente con una inadecuada conducta maternal, tal como la no introducción de pelo y paja en los nidales por parte de las conejas o los partos fuera del nidal. En el 84,6% de los partos en los que ocurrió canibalismo las conejas no introdujeron pelo en los nidales, y en el 92,3% de los partos con gazapos canibalizados las conejas no introdujeron paja en los nidales. El canibalismo también estuvo asociado con una gran proporción de conejas que parían fuera de los nidales (53,8%). Se discute que el canibalismo practicado por las conejas silvestres alojadas en jaula es una manifestación del fracaso en el desarrollo de la conducta maternal como consecuencia del estrés que experimentan en cautividad

Impacto territorial de la dependencia en España: población afectada y costes asociados a su atención

La aprobación y puesta en marcha de la Ley de Dependencia hasupuesto un nuevo campo de actuación para las políticas públicas. De acuerdo adicha Ley, son las Comunidades Autónomas las responsables de ofrecer los servicios.Por ello parece oportuno plantearse si el impacto será igual en todas ellas.Este trabajo trata de evaluar el número de personas dependientes con derecho aayudas públicas en cada territorio y el coste asociado a su atención, tanto en elinstante actual como hasta 2015, año en el que el sistema público de atención estaráplenamente desarrollado

Decompositions of matrices into a sum of invertible matrices and matrices of fixed nilpotence.

For any n ≥ 2 and fixed k ≥ 1, we give necessary and sufficient conditions for an arbitrary nonzero square matrix in the matrix ring Mn(F) to be written as a sum of an invertible matrix U and a nilpotent matrix N with Nk = 0 over an arbitrary field F.The first-named author (Peter V. Danchev) was supported in part by the Bulgarian National Science Fund under Grant KP-06 No. 32/1 of December 07, 2019, as well as by the BIDEB 2221 of TÜBÍTAK, the second-named author (Esther García) was partially supported by Ayuda Puente 2022, URJC. The three authors were partially supported by the Junta de Andalucía FQM264

Decompositions of endomorphisms into a sum of roots of the unity and nilpotent endomorphisms of fixed nilpotence.

For n ≥ 2 and fixed k ≥ 1, we study when an endomorphism f of Fn, where F is an arbitrary field, can be decomposed as t + m where t is a root of the unity endomorphism and m is a nilpotent endomorphism with mk = 0. For fields of prime characteristic, we show that this decomposition holds as soon as the characteristic polynomial of f is algebraic over its base field and the rank of f is at least n k , and we present several examples that show that the decomposition does not hold in general. Furthermore, we completely solve this decomposition problem for k = 2 and nilpotent endomorphisms over arbitrary fields (even over division rings). This somewhat continues our recent publications in Linear Multilinear Algebra (2022) and Int.P. Danchev was partially supported by the Bulgarian National Science Fund under Grant KP-06 No. 32/1 of December 07, 2019, as well as by the BIDEB 2221 of TÜBÍTAK. 2 E. García was partially supported by Ayuda Puente 2022, URJC. 3 M. Gómez were partially supported by the Junta de Andalucía FQM264

On prescribed characteristic polynomials.

Let F be a field. We show that given any nth degree monic polynomial q(x) ∈ F[x] and any matrix A ∈ Mn(F) whose trace coincides with the trace of q(x) and consisting in its main diagonal of k 0-blocks of order one, with k < n − k, and an invertible non-derogatory block of order n − k, we can construct a square-zero matrix N such that the characteristic polynomial of A + N is exactly q(x). We also show that the restriction k < n − k is necessary in the sense that, when the equality k = n − k holds, not every characteristic polynomial having the same trace as A can be obtained by adding a square-zero matrix. Finally, we apply our main result to decompose matrices into the sum of a square-zero matrix and some other matrix which is either diagonalizable, invertible, potent or torsion.Institute of Mathematics and Informatics, Bulgarian Academy of Sciences Universidad Rey Juan Carlos Universidad de Malag

A filtration associated to an abelian inner ideal of a Lie algebra.

Let B be an abelian inner ideal and let KerL B be the kernel of B. In this paper we show that when there exists n ∈ N with [B,KerL B] n ⊂ B, the inner ideal B induces a bounded filtration in L where B is the first nonzero submodule of the filtration and where the wings of the Lie algebra associated to the filtration coincide with the subquotient determined by B. This filtration extends the principal filtration induced by ad-nilpotent elements of index less than or equal to three defined in [E. García, M. Gómez Lozano, Principal filtrations of Lie algebras, Commun. Algebra 40 (10) (2012) 3622–3628].All authors were partially supported by the Junta de Andalucía FQM264, and by the Universidad de Málaga B4: Ayudas para Proyectos Puente UMA “Sistemas de Jordan, álgebras de Lie y estructuras relacionadas”

A Jordan Canonical Form for nilpotent elements in an arbitrary ring

En este poster resumimos una nueva forma de calcular la forma canónica de un elemento nilpotente dentro de un álgebra asociativa.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

A Jordan canonical form for nilpotent elements in an arbitrary ring.

https://v2.sherpa.ac.uk/id/publication/16712In this paper we give an inductive new proof of the Jordan canonical form of a nilpotent element in an arbitrary ring. If is a nilpotent element of index n with von Neumann regular , we decompose with a Jordan block of size n over a corner S of R, and nilpotent of index <n for an idempotent e of R commuting with a. This result makes it possible to characterize prime rings of bounded index n with a nilpotent element of index n and von Neumann regular as a matrix ring over a unital domain

New Approach to Intelligent Pedestrian Detection and Signaling on Crosswalks

Traffic signaling systems play a crucial role in improving driver attention and reducing road speed. Nevertheless, most available solutions face challenges such as limited commercial availability, high infrastructure costs, lack of intelligence, and incomplete coverage for all road users. To address these obstacles and bolster road safety, this manuscript introduces an innovative intelligent crosswalk featuring speed bumps with integrated light signaling, facilitating precise pedestrian detection through artificial intelligence. The design methodology incorporates resins, aggregates, and reinforcing fibers, cold-injected into an aluminum mold. Notably, the system operates autonomously on solar power, ensuring sustainability and robust protection against environmental elements. To validate the crosswalk, quantitative indicators of road safety improvement are compared against a conventional crosswalk and a prior system based on fuzzy logic. A comprehensive ROC analysis of the implemented machine learning techniques revealed an accuracy rate of 99.11% in pedestrian detection, representing a substantial leap forward in road safety. In addition, a study assessing the system’s impact on user behavior found a 46.5% improvement in pedestrian trajectory, along with speed reductions observed for both pedestrians (10.24%) and drivers (32.83% during the day, and 70.6% at night). The study was further completed with an analysis of the opinion of users who perceived a significant improvement in safety and compliance with regulations with the intelligent crosswalk, highlighting the potential of the system to significantly contribute to the enhancement of road safet

Influence of meteorological phenomena on worldwide aircraft accidents in the period 1967-2010

This is the pre-peer reviewed version of the following article: Mazon, J., Rojas, J. I., Lozano, M., Pino, D., Prats, X. and Miglietta, M. M. (2017), Influence of meteorological phenomena on worldwide aircraft accidents, 1967–2010. Met. Apps. doi:10.1002/met.1686, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/met.1686/abstract. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.Based on the information available in databases from relevant national and international organizations from 1967 to 2010, an Aviation Weather Accidents Database (AWAD) was built. According to the AWAD, the weather is the primary cause in a growing percentage of annual aircraft accidents: from about 40% in 1967 to almost 50% in 2010. While the absolute number of fatalities and injured people due to aircraft accidents has decreased significantly, the percentage of fatalities and injured people in accidents attributed to the weather shows a slight increase in the studied period. The influence of turbulence, clear air turbulence, wind shear, low visibility, rain, icing, snow and storms on aircraft accidents was analysed, considering the different phases of flight, the meteorological seasons of the year and the spatial distribution over four zones of the Earth. These zones were defined following meteorological and climatological criteria, instead of using the typical political criteria. A major part of the accidents and accidents attributed to the weather occur in latitudes between 12º and 38º in both hemispheres. It is concluded that actions aimed at reducing the risk associated with low visibility, rain and turbulence, in this order, should have priority to achieve the most significant improvements in air transport safety.Postprint (author's final draft