Browsing Articles publicats (Matemàtica) by Title
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Magic coverings and the Kronecker product
(2014)In this paper we study a relationship existing among (super) magic coverings and the well known Kronecker product of matrices. We also introduce the concept of Znproperty for digraphs in order to study this relation ... 
Minimum tree decompositions with a given tree as a factor
(Combinatorial Mathematics Society of Australasia, 2005)A tree decomposition of a graph G is a family of subtrees whose sets of edges partition the set of edges of G. In this paper we are interested in the structure of the trees involved in tree decompositions with the minimum ... 
Mixed Moore Cayley graphs
(Elsevier, 20140901)Cayley graphs are well known objects with interesting properties, also in the context of Moore graphs and digraphs. In $1978$ Bos\'ak extended Moore's property to the mixed setting (with arcs allowed along with edges), in ... 
Mobile terrestrial laser scanner applications in precision fruticulture/ horticulture and tools to extract information from canopy point clouds
(Springer Science+Business Media, 20170101)LiDAR sensors are widely used in many areas and, in recent years, that includes agricultural tasks. In this work, a selfdeveloped mobile terrestrial laser scanner based on a 2D light detection and ranging (LiDAR) sensor ... 
Modeling inertia through the interaction with quantum fluctuations
(Elsevier, 2021)The origin of inertia of macroscopic bodies has never been thoroughly elucidated. In this paper we provide a new explanation based on the following assumptions: (i) we can think of any body as being composed by resonant ... 
Modeling of Vaccination and Contact Tracing as Tools to Control the COVID19 Outbreak in Spain
(MDPI, 2021)We developed an agentbased stochastic model, based on P Systems methodology, to decipher the effects of vaccination and contact tracing on the control of COVID19 outbreak at population level under different control ... 
Modeling tactical planning decisions through a linear optimization model in sow farms
(Elsevier, 2012)This paper deals with tactical planning decisions for breeding farms producing piglets through a linear optimization model. A mediumterm planning horizon based on weekly periods is considered. The proposed model maximizes ... 
Modeling the consequences of the demise and potential recovery of a keystonespecies: wild rabbits and avian scavengers in Mediterranean landscapes
(Nature Publishing Group, 2015)Restoration of demised keystonespecies populations is an overriding concern in conservation biology. However, since no population is independent of its environment, progress is needed in predicting the efficacy of restoration ... 
Modelling the effects of sanitary policies on European vulture conservation
(Nature Publishing Group, 2012)Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics. However, the magnitude and complexity of these effects may still be greatly underestimated. Most Old World ... 
Modelling the SARSCOV2 outbreak: assessing the usefulness of protective measures to reduce the pandemic at population level
(Elsevier, 2021)A new bioinspired computational model was developed for the SARSCoV2 pandemic using the available epidemiological information, highresolution population density data, travel patterns, and the average number of contacts ... 
Modified inertia from extended uncertainty principle(s) and its relation to MoND
(Springer, 2020)In this paper we show that Modified Inertia, i.e., the modification of inertia predicted by some alternative theories of gravity at cosmic scales, can be naturally derived within the framework of the extended uncertainty ... 
Modified inertial mass from information loss
(World Scientific Publishing, 2017)A modification of inertia (called MiHsC or quantized inertia) has been proposed that assumes that inertia is caused by Unruh radiation, and that this radiation is made inhomogeneous in space by either Rindler horizons ... 
New constructions for the nqueens problem
(Springer, 202002)Let D be a digraph, possibly with loops. A queen labeling of D is a bijective function l:V(G)⟶{1,2,…,V(G)} such that, for every pair of arcs in E(D), namely (u, v) and (u′,v′) we have (i) l(u)+l(v)≠l(u′)+l(v′) and (ii) ... 
New cyclic Kautz digraphs with optimal diameter
(University of Calgary, 20211231)We obtain a new family of digraphs with minimal diameter, that is, given the number of vertices and outdegree, there is no other digraph with a smaller diameter. This new family of digraphs are called `modified cyclic ... 
New MooreLike Bounds and Some Optimal Families of Abelian Cayley Mixed Graphs
(20200606)Mixed graphs can be seen as digraphs that have both arcs and edges (or digons, that is, two opposite arcs). In this paper, we consider the case where such graphs are Cayley graphs of abelian groups. Such groups can be ... 
New problems related to the valences of (super) edgemagic labelings
(2013)A graph G of order p and size q is edgemagic if there is a bijective function f : V (G) ∪ E(G) −→ {i} p+q i=1 such that f(x) + f(xy) + f(y) = k , for all xy ∈ E(G) . The function f is an edgemagic labeling of G and the ... 
New results for the Mondrian art problem
(Elsevier, 2021)The Mondrian problem consists of dissecting a square of side length n ∈ N into noncongruent rectangles with natural length sides such that the difference d(n) between the largest and the smallest areas of the rectangles ... 
Nilpotent centres via inverse integrating factors
(Cambridge University Press, 201610)In this paper we are interested in the nilpotent center problem of planar analytic monodromic vector fields. It is known that the formal integrability is not enough to characterize such centers. More general objects are ... 
Non existence of almost Moore digraphs of diameter three
(Electronic Journal of Combinatorics, 2008)Almost Moore digraphs appear in the context of the degree/diameter problem as a class of extremal directed graphs, in the sense that their order is one less than the unattainable Moore bound M(d; k) = 1 + d + + dk, where ... 
Nonexistence of limit cycles for planar vector fields
(Texas State University. Department of Mathematics, 2014)This article presents sufficient conditions for the nonexistence of limit cycles for planar vector fields. Classical methods for the nonexistence of limit cycles are connected with the theory developed here.