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Search Results: 1 - 10 of 345157 matches for " J. Carlos; Escoriza-Mateu "
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Trabajo, producción y cerámica. Sociología de la alfarería Paracas: Ocucaje y Tajo (Costa Sur de Perú)
Pedro V. Castro-Martínez,J. Carlos De La Torre,Trinidad Escoriza-Mateu,M. Concepción Godoy
Estudios Atacame?os , 2009,
Abstract: Las secuencias cronológicas basadas en las seriaciones de la "cerámica Paracas" fueron revisadas, haciendo evidentes las paradojas, contradicciones e incoherencias de las cronologías relativas elaboradas desde axiomas histérico-culturales. Evaluamos las evidencias a partir de dataciones C14 independientes. Finalmente, se discuten las claves para una sociología de la alfarería de los estilos de Ocucaje y Tajo, en el marco del Proyecto La Puntilla (Nasca, lea). Independent C14 dating was contrasted to chronological sequences based on "Paracas Pottery" series, evidencing the paradoxes, contradictions and incoherence in the relative chronologies derived from historico-cultural axioms. The conclusion addresses key aspects for a sociology of Ocucaje and Tajo ceramics, in the framework of the La Puntilla Project (Nasca, lea).
Trabajo, producción y cerámica. Sociología de la alfarería Paracas: Ocucaje y Tajo (Costa Sur de Perú)
Castro-Martínez,Pedro V.; De La Torre,J. Carlos; Escoriza-Mateu,Trinidad; Godoy,M. Concepción; Lapi,Bárbara; Navarro,Israel; Zavala,J. César;
Estudios atacame?os , 2009, DOI: 10.4067/S0718-10432009000100009
Abstract: independent c14 dating was contrasted to chronological sequences based on "paracas pottery" series, evidencing the paradoxes, contradictions and incoherence in the relative chronologies derived from historico-cultural axioms. the conclusion addresses key aspects for a sociology of ocucaje and tajo ceramics, in the framework of the la puntilla project (nasca, lea).
Tinautius exilis sp. n. (Coleoptera, Carabidae, Pterostochini) de la Alpujarra almeriense (SE Espa a)
Mateu, J.
Animal Biodiversity and Conservation , 2001,
Abstract: Tinatius exilis n. sp. (Coleoptera, Carabidae, Pterostochini) from the Alpujarra of Almería (SE Spain).-A new troglobitic species belonging to the genus Tinautius Mateu 1997, from the Sierra de Cazorla in the province of Jaen is described. This new species (T. exilis n. sp.) was found in the Alpujarra mountains in Almería. It is anophthalmous and differs from the anterior species in several morphological features. The female genitalia and the particular shape of the metatrochant enable simple differentiation with the two species of the genus Tinautius known to date.
RECOVERING FOSSIL RECORDS FROM GALAXY SPECTRA USING A 2D DYNAMICAL BASE
J. Mateu
Revista mexicana de astronomía y astrofísica , 2009,
Abstract: The study of stellar populations has gained importance in the last years thanks to the availability of high quality spectra of a considerable number of galaxies (for example the Sloan Digital Sky Survey - SDSS). Extracting the greater amount of information from these spectra has been the objective of many investigations. In general, these methods are based on the principle that the spectrum of a galaxy can be represented as a linear combination of the spectra of the populations that compose it, each one with its corresponding age and chemical composition. Nevertheless, the components of this linear combination, that is the spectra of the stellar population represented as a vector in a N-dimensional space (elements of the basis), are almost parallel in spite of being linearly independent and this, combined with the uncertainties of the observed spectra causes that di erent star formation histories reproduce the same observed spectrum. The amount of information that can be extracted will essentially depend on the signal to noise ratio and wavelength interval of the observed spectrum. Until now the algorithms to recover the star formation history from observed spectra use a static basis with a number of elements between 8 and 125. When increasing the number of basis elements it certainly improves the tting of the observed spectrum but also it increases the degeneration of the solution signi cantly, making very difficult the interpretation of the results. In this work we developed a new algorithm with a dynamical (not static) basis of only 2 elements which is used to recover both the coefficients of the linear combination and the age of the basis vectors. We made some simulations designed to test the algorithm obtaining excellent, high quality ttings with easy to interpret results and very well de ned uncertainties.
Form Factors in the radiative pion decay
Mateu, V.;Portoles, J.
High Energy Physics - Phenomenology , 2007, DOI: 10.1140/epjc/s10052-007-0393-5
Abstract: We perform an analysis of the form factors that rule the structure-dependent amplitude in the radiative pion decay. The resonance contributions to pion -> e nu_e gamma decays are computed through the proper construction of the vector and axial-vector form factors by setting the QCD driven asymptotic properties of the three-point Green functions VVP and VAP, and by demanding the smoothing of the form factors at high transfer of momentum. A comparison between theoretical and experimental determinations of the form factors is also carried out. We also consider and evaluate the role played by a non-standard tensor form factor. We conclude that, at present and due to the hadronic incertitudes, the search for New Physics in this process is not feasible.
El género Antoinella Jeannel, 1937 (Coleoptera, Carabidae, Trechinae) tres especies nuevas de Marruecos: A. espanyoli sp. n., A. iblanensis sp. n. y A. fadriquei sp. n.
J. Mateu,O. Escolà
Animal Biodiversity and Conservation , 2006,
Abstract: Genera Antoinella Jeannel, 1937 (Coleoptera, Carabidae, Trechinae) three new species from Morocco: A. espanyoli n. sp. , A. iblanensis n. sp. y A. fadriquei n. sp.Three new species of the genus Antoinella Jeannel (Carabidae, Trechinae) are described from the region of Taza in Morocco: A. espanyoli n. sp. (the smallest of all Antoniella), A. iblanensis n. sp. (with the end of aedeagus truncate) and A. fadriquei n. sp. (with the aedeagus rather similar to that of A. iblanensis n. sp. but end not trunacte). A brief summary on the geographical dispersion of the genus is given. The most distinctive taxonomic characteristics concern the male genitalia; the accompanying drawings contribute further to the identification of the new taxa.
APLICACIóN DE UN PROCEDIMIENTO PARA LA DETERMINACIóN Y EVALUACIóN DE LOS FALLOS EN UN BANCO DE SANGRE
Tatiana Escoriza Martínez,René Abreu Ledón,Carlos Machado Osés
Ingeniería Industrial , 2010,
Abstract:
Quasi-arithmetic means of covariance functions with potential applications to space-time data
E. Porcu,J. Mateu,G. Christakos
Mathematics , 2006,
Abstract: The theory of quasi-arithmetic means is a powerful tool in the study of covariance functions across space-time. In the present study we use quasi-arithmetic functionals to make inferences about the permissibility of averages of functions that are not, in general, permissible covariance functions. This is the case, e.g., of the geometric and harmonic averages, for which we obtain permissibility criteria. Also, some important inequalities involving covariance functions and preference relations as well as algebraic properties can be derived by means of the proposed approach. In particular, we show that quasi-arithmetic covariances allow for ordering and preference relations, for a Jensen-type inequality and for a minimal and maximal element of their class. The general results shown in this paper are then applied to study of spatial and spatiotemporal random fields. In particular, we discuss the representation and smoothness properties of a weakly stationary random field with a quasi-arithmetic covariance function. Also, we show that the generator of the quasi-arithmetic means can be used as a link function in order to build a space-time nonseparable structure starting from the spatial and temporal margins, a procedure that is technically sound for those working with copulas. Several examples of new families of stationary covariances obtainable with this procedure are shown. Finally, we use quasi-arithmetic functionals to generalise existing results concerning the construction of nonstationary spatial covariances and discuss the applicability and limits of this generalisation.
New estimates for the maximal singular integral
Joan Mateu,Joan Orobitg,Carlos Perez,Joan Verdera
Mathematics , 2009,
Abstract: In this paper we pursue the study of the problem of controlling the maximal singular integral $T^{*}f$ by the singular integral $Tf$. Here $T$ is a smooth homogeneous Calder\'on-Zygmund singular integral of convolution type. We consider two forms of control, namely, in the $L^2(\Rn)$ norm and via pointwise estimates of $T^{*}f$ by $M(Tf)$ or $M^2(Tf)$, where $M$ is the Hardy-Littlewood maximal operator and $M^2=M \circ M$ its iteration. It is known that the parity of the kernel plays an essential role in this question. In a previous article we considered the case of even kernels and here we deal with the odd case. Along the way, the question of estimating composition operators of the type $T^\star \circ T$ arises. It turns out that, again, there is a remarkable difference between even and odd kernels. For even kernels we obtain, quite unexpectedly, weak $(1,1)$ estimates, which are no longer true for odd kernels. For odd kernels we obtain sharp weaker inequalities involving a weak $L^1$ estimate for functions in $L LogL$.
Creation of a Geo-Spatial Database to Analyse Railways in Europe (1830-2010). A Historical GIS Approach  [PDF]
Mateu Morillas-Torné
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.42023
Abstract: The GIS is a tool that allows us to study the logic of the distribution of phenomena that occur on the Earth’s surface. In this article, we propose exploring its potential for historical research over long periods. Here, we present a Historical GIS (HGIS) of the railways of Europe for the period 1830-2010. This is a response to the need to carry out spatialtemporal analyses in order to evaluate the territorial impact of the railway and its influence on the distribution of population. The main objectives of this work are: to publicise the existence of this spatial database; to explain the approach followed in order to produce it; and to highlight some of the results that have already been achieved by using it. To date, the possibilities offered by HGIS have hardly been explored in research into the territorial impact of the railway. Similarly, until now, little work has been done in this area at the European scale. The most innovative aspects of this HGIS therefore lie in the methodology used and the subject treated.
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