Browsing Articles publicats (Matemàtica) by Title
Now showing items 289308 of 358

Representaciones matemáticas de niños y niñas de 56 años cuando resuelven un problema abierto
(Universidad Politécnica Salesiana, 2022)La resolución de problemas y la representación son dos procesos fundamentales de la actividad matemática. Ya que, su desarrollo proporciona una base clave para el aprendizaje de las matemáticas en todos los niveles escolares. ... 
Reversible nilpotent centers with cubic homogeneous nonlinearities
(Elsevier, 2016)We provide 13 nontopological equivalent classes of global phase portraits in the Poincaré disk of reversible cubic homogeneous systems with a nilpotent center at origin, which complete the classification of the phase ... 
Review of mathematical models for sow herd management
(Elsevier, 2007)This paper is a survey of the different sow models described in literature, which made use of different mathematical methodologies, and were intended for sow herd management. Models were discussed under a wide classification, ... 
Searching for large multiloop networks
(Elsevier, 2014)We describe and implement a computerbased method to find large multiloop graphs with given degree and diameter. For some values of degree and diame ter, our algorithm produces the largest known circulant graphs. We ... 
Secondgeneration anticoagulant rodenticides in the blood of obligate and facultative European avian scavengers
(Elsevier, 2022)The widespread use of secondgeneration anticoagulant rodenticides (SGARs) and their high persistence in animal tissues has led to these compounds becoming ubiquitous in rodentpredatorscavenger food webs. Exposure to ... 
Secure manytoone communications in wireless sensor networks
(Molecular Diversity Preservation International (MDPI), 2009)Wireless Sensor Networks (WSN) are formed by nodes with limited computational and power resources. WSNs are finding an increasing number of applications, both civilian and military, most of which require security for the ... 
Securing Databases by using Diagonalbased Order Preserving Symmetric Encryption
(Natural Sciences Publishing, 2014)The amount of information stored in databases is constantly increasing. Databases contain multiple records, each of them divided in several data fields. And some of these fields may contain sensitive information, so there ... 
Sequence Mixed Graphs
(Elsevier, 2017)A mixed graph can be seen as a type of digraph containing some edges (or two opposite arcs). Here we introduce the concept of sequence mixed graphs, which is a generalization of both sequence graphs and iterated line ... 
Sexrelated differences in body condition and serum biochemical parameters in red deer (Cervus elaphus) naturally infected with Mycobacterium bovis
(Elsevier, 2013)Although Mycobacterium bovis infection is commonly reported in red deer (Cervus elaphus), potential differences in the effects of infection on male and female animals in terms of body condition and clinical biochemistry ... 
Simulation Analysis and Comparison of New Hybrid TLIµTESLA and Variant TESLA Protocols Using SHA2 and SHA3 Hash Functions
(MDPI, 2022)The evolution of 5G and 6G networks has enhanced the ability of massive IoT devices to provide realtime monitoring and interaction with the surrounding environment. Despite recent advances, the necessary security services, ... 
Small Amplitude Periodic Orbits in ThreeDimensional Quadratic Vector Fields with a ZeroHopf Singularity
(Springer, 2022)We consider some families of threedimensional quadratic vector fields having a fixed zeroHopf equilibrium.We are interested in the bifurcation of periodic νorbits from the singularity, that is, those small amplitude ... 
Small cutsets in arctransitive digraphs of prime degree
(Elsevier, 2013)We give an upper bound for the size of nontrivial sets that have small boundary in a family of arctransitive digraphs. We state the exact size for these sets in case of prime degree. We also give a lower bound for the ... 
Some remarks on global analytic planar vector fields possessing an invariant analytic set
(Taylor and Francis, 20210201)We study the problem of determining the canonical form that a planar analytic vector field in all the real plane can have in order to possess a given invariant analytic set. We determine some conditions that guarantee that ... 
Space–time trends in Spanish bird electrocution rates from alternative information sources
(Elsevier, 2015)Interaction with manmade infrastructures is one of the main sources of nonnatural bird mortality. Here, we use a longterm study (1980–2010) to analyse spatial and temporal patterns in avian electrocution in Spain, using ... 
Spatiotemporal configurations of humancaused fires in Spain through point patterns
(MDPI, 2016)Humancaused wildfires are often regarded as unpredictable, but usually occur in patterns aggregated over space and time. We analysed the spatiotemporal configuration of 7790 anthropogenic wildfires (2007–2013) in nine ... 
Spectra and eigenspaces from regular partitions of Cayley (di)graphs of permutation groups
(Elsevier, 2020)In this paper, we present a method to obtain regular (or equitable) partitions of Cayley (di)graphs (that is, graphs, digraphs, or mixed graphs) of permutation groups on n letters. We prove that every partition of the ... 
Spectra and eigenspaces of arbitrary lifts of graphs
(Springer, 20210923)We describe, in a very explicit way, a method for determining the spectra and bases of all the corresponding eigenspaces of arbitrary lifts of graphs (regular or not). 
Spectra and eigenspaces of arbitrary lifts of graphs
(Faculty of Mathematics, Physics and Informatics, Comenius University, 2019)We describe, in a very explicit way, a method for determining the spectra and bases of all the corresponding eigenspaces of arbitrary lifts of graphs (regularor not). 
Stochastic smoothing of point processes for wildlifevehicle collisions on road networks
(Springer, 2021)Wildlifevehicle collisions on road networks represent a natural problem between human populations and the environment, that affects wildlife management and raise a risk to the life and safety of car drivers. We propose ... 
Strongly formal Weierstrass nonintegrability for polynomial differential systems in C2
(Bolyai Institute, University of Szeged; Hungarian Academy of Sciences, 2020)Recently a criterion has been given for determining the weakly formal Weierstrass nonintegrability of polynomial differential systems in C2 . Here we extend this criterion for determining the strongly formal Weierstrass ...