Listar MAT_Articles por idioma "eng"
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A New Bayesian Inference Methodology for Modeling Geochemical Elements in Soil with Covariates. Characterization of Lithium in South Iberian Range (Spain)
Global Journals Inc. (2016)When the scientific need to model geochemical elements in soil, is using geostatistical methodologies, for instance krigings, but we can use a new possibility with Bayesian Inference. The ... -
A new bi-parametric family of temporal transformations to improve the integration algorithms in the study of the orbital motion
Elsevier (2016-02-06)One of the fundamental problems in celestial mechanics is the study of the orbital motion of the bodies in the solar system. This study can be performed through analytical and numerical methods. Analytical methods are based ... -
A new class of superregular matrices and MDP convolutional codes
Elsevier (2013)This paper deals with the problem of constructing superregular matrices that lead to MDP convolutional codes. These matrices are a type of lower block triangular Toeplitz matrices with the property that all the square ... -
A new expression for the density of totally geodesic submanifolds in space forms, with stereological applications
Elsevier (2009)Integral section formulae for totally geodesic submanifolds (planes) intersecting a compact submanifold in a space form are available from appropriate representations of the motion invariant density (measure) of these ... -
A New Geometric Metric in the Shape and Size Space of Curves in R n
MDPI (2020-10-01)Shape analysis of curves in Rn is an active research topic in computer vision. While shape itself is important in many applications, there is also a need to study shape in conjunction with other features, such as scale and ... -
A New Optimality Property of Strang’s Splitting
Society for Industrial and Applied Mathematics (2023)For systems of the form ̇q = M−1 p, ̇p = −Aq + f(q), common in many applications, we analyze splitting integrators based on the (linear/nonlinear) split systems ̇q = M−1 p, ̇p = −Aq and ̇q = 0, ̇p = f(q). We show ... -
A new population model for urban infestations
Elsevier (2023-10-10)The spread of rodents and insects in cities, in particular in summer periods, poses significant health, economic, social and environmental threats. The analysis of incidence and identification of seasonal and weather ... -
A new rotational integral formula for intrinsic volumes in space forms
Elsevier (2010)A new rotational version of Crofton's formula is derived for the intrinsic volumes of a domain Y in a space form. More precisely, a functional is defined on the intersection between Y and a totally geodesic submanifold ... -
A nonparametric test for the comparison of first-order structures of spatial point processes
Elsevier (2017)Comparing the spatial distribution of two spatial point patterns is an important issue in many scientific areas such as ecology, epidemiology or environmental risk assessment. However, up to date, the analysis of multitype ... -
A nonseparable first-order spatiotemporal intensity for events on linear networks: An application to ambulance interventions
Institute of Mathematical Statistics (2024-03)The algorithms used for the optimal management of an ambulance fleet require an accurate description of the spatiotemporal evolution of the emergency events. In the last years, several authors have proposed sophisticated ... -
A note on bf-spaces and on the distribution of the functor of the Dieudonné completion
De Gruyter Open (2021-12)A subset B of a space X is said to be bounded (in X) if the restriction to B of every real-valued continuous function on X is bounded. A real-valued function on X is called bf -continuous if its restriction to each bounded ... -
A note on the Baker–Campbell–Hausdorff series in terms of right-nested commutators
Springer (2021-01-27)We get compact expressions for the Baker–Campbell–Hausdorff series Z = log(eX eY ) in terms of right-nested commutators. The reduction in the number of terms originates from two facts: (i) we use as a starting point an ... -
A note on the first-order theories of equilibrium figures of celestial bodies
Taylor & Francis (2011)One of the main problems in celestial mechanics is the determination of the shape of the equilibrium configuration of celestial bodies. In this paper, a model of a fluid mass rotating in space like a rigid body will be ... -
A note on the mean-square solution of the hypergeometric differential equation with uncertainties
Springer (2024-02-06)The Fröbenius method of power series has been applied to several linear random differential equations. The interest relies on the derivation of a closed-form mean-square solution and on the possibility of approximating ... -
A Note on the Use of Generalized Sundman Anomalies in the Numerical Integration of the Elliptical Orbital Motion
Hindawi Publishing Corporation (2014-09-11)The orbital motion around a central body is an interesting problem that involves the theory of artificial satellites and the planetary theories in the solar system.Nevertheless some difficult situations appearwhile studying ... -
A note on trigonometric identities involving non-commuting matrices
Springer Milan (2017)An algorithm is presented for generating successive approximations to trigonometric functions of sums of non-commuting matrices. The resulting expressions involve nested commutators of the respective matrices. The procedure ... -
A pedagogical approach to the Magnus expansion
Institute of Physics (2010-07)Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrödinger equation does not preserve unitarity. Here we present, in a simple way, how the Magnus expansion (also known as exponential ... -
A penalized likelihood method for nonseparable space–time generalized additive models
Springer Verlag (2018-07)In this paper, we study space-time generalized additive models. We apply the penalyzed likelihood method to fit generalized additive models (GAMs) for nonseparable spatio-temporal correlated data in order to improve the ... -
A phenomenological model for COVID-19 data taking into account neighboring-provinces effect and random noise
Wiley (2022)We model the incidence of the COVID-19 disease during the first wave of the epidemic in Castilla-Leon (Spain). Within-province dynamics may be governed by a generalized logistic map, but this lacks of spatial structure. ... -
A Poisson cokriging method for bivariate count data
Elsevier (2023)Bivariate spatially correlated count data appear naturally in several domains such as ecology, economy and epidemiology. Current methods for analysing such data lack simplicity, interpretability and computational awareness. ...