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Wyszukujesz frazę "Mendez, G." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effective properties of periodic media in elastodynamic problems
    Autorzy:
    Yera, Rolando
    Méndez, Carlos G.
    Sánchez, Pablo J.
    Huespe, Alfredo E.
    Powiązania:
    https://bibliotekanauki.pl/articles/29520225.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    effective properties
    acoustic metamaterials
    wave propagation
    periodic media
    Bloch waves
    phononic crystal
    metamateriały akustyczne
    propagacja fali
    media okresowe
    fale Blocha
    kryształ fononiczny
    Opis:
    This paper describes a homogenization model for evaluating the effective elastodynamic properties of acoustic metamaterials in problems involving wave propagation. The methodology is based on determining the constitutive equations in terms of averaged quantities observed at the macroscale. In this sense, the approach very closely follows the pioneering ideas introduced by Willis, and afterwards, followed by several authors in the last ten years. The distinctive characteristic of our approach is that we write the microscale equation in the spatial domain. The model is validated with previous results published in the literature, and our results replicate them almost exactly. The resulting homogenization model could be used as an additional tool for the topology design of acoustic metamaterials.
    Źródło:
    Computer Methods in Materials Science; 2021, 21, 3; 139-148
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anderson Localization Phenomenon in One-Dimensional Elastic Systems
    Autorzy:
    Méndez-Sánchez, R.
    Gutiérrez, L.
    Morales, A.
    Flores, J.
    Díaz-de-Anda, A.
    Monsivais, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399046.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Rn
    71.23.An
    05.45.Mt
    05.60.Gg
    Opis:
    The phenomenon of the Anderson localization of waves in elastic systems is studied. We analyze this phenomenon in two different sets of systems: disordered linear chains of harmonic oscillators and disordered rods which oscillate with torsional waves. The first set is analyzed numerically whereas the second one is studied both experimentally and theoretically. In particular, we discuss the localization properties of the waves as a function of the frequency. In doing that we have used the inverse participation ratio, which is related to the localization length. We find that the normal modes localize exponentially according to the Anderson theory. In the elastic systems, the localization length decreases with frequency. This behavior is in contrast with what happens in analogous quantum mechanical systems, for which the localization length grows with energy. This difference is explained by means of the properties of the reflection coefficient of a single scatterer in each case.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1063-1068
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering of Elastic Waves in a Quasi-One-Dimensional Cavity: Theory and Experiment
    Autorzy:
    Báez, G.
    Cobián-Suárez, M.
    Martínez-Argüello, A.
    Martínez-Mares, M.
    Méndez-Sánchez, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399047.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.40.Cd
    62.30.+d
    03.65.Nk
    73.21.Fg
    Opis:
    We study the scattering of torsional waves through a quasi-one-dimensional cavity both from the experimental and theoretical points of view. The experiment consists of an elastic rod with square cross-section. In order to form a cavity, a notch at a certain distance of one end of the rod was grooved. To absorb the waves, at the other side of the rod, a wedge, covered by an absorbing foam, was machined. In the theoretical description, the scattering matrix S of the torsional waves was obtained. The distribution of S is given by Poisson's kernel. The theoretical predictions show an excellent agreement with the experimental results. This experiment corresponds, in quantum mechanics, to the scattering by a delta potential, in one dimension, located at a certain distance from an impenetrable wall.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1069-1073
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Categorisation Method Using Long-term Measurements
    Autorzy:
    Rey Gozalo, G.
    Barrigón Morillas, J. M.
    Gómez Escobar, V.
    Vílchez-Gómez, R.
    Méndez Sierra, J. A.
    Carmona del Río, F. J.
    Prieto Gajardo, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/177690.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise pollution
    sampling methods
    street categorisation
    Opis:
    Previous studies concerning the categorisation method have been based on short daytime measure- ments. These studies demonstrated urban-noise stratification in the daytime. Nevertheless, legislation and standards refer to noise estimation throughout the day. This paper presents the first attempt to apply the categorisation method to indicators obtained through long-term measurements. The study was conducted in Plasencia, Extremadura (Spain) which has approximately 41,500 inhabitants. First, we conducted a stratification of the roads using the categorisation method. Second, long-term measurements (approxi- mately one week) were conducted at different sampling locations across different categories of streets. The results were analysed by category. Moreover, the profile of the noise-level variation was analysed during the day. The results revealed a stratification of sound levels measured across the different categories. Furthermore, we found health risks due to the noise levels in this town. Short-term measurements were also conducted to complete the categorisation method suitability analysis.
    Źródło:
    Archives of Acoustics; 2013, 38, 3; 397-405
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Grid Sampling Method for Noise Mapping
    Autorzy:
    Gómez Escobar, V.
    Barrigón Morillas, J. M.
    Rey Gozalo, G
    Vilchez-Gómez, R.
    Carmona del Rio, J.
    Méndez Sierra, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176666.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grid method
    noise mapping
    urban noise
    Opis:
    The grid method is the most widely used technique for measurement-based noise assessment, and indeed is part of the ISO 1996-2 standard. Nevertheless it has certain disadvantages. The present work is an analysis of the grid method for evaluating noise, firstly in the city of C´aceres and, secondly in two other smaller towns. Using as reference a 200 metre grid study, a study was made of the effect of varying the size and form of the grid on the city’s overall noise value, the percentage of data found to lie above some reference thresholds, and the noise value assigned to a certain zone of the city. The ISO 1996 recommendations of the necessity of new sampling points and the method’s predictive capacity for these new measurements were also analyzed.
    Źródło:
    Archives of Acoustics; 2012, 37, 4; 499-514
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two variations of the Public Good Index for games with a priori unions
    Autorzy:
    Alonso-Meijide, J. M.
    Casas-Mendez, B.
    Fiestras-Janeiro, G.
    Holler, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/969904.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    simple game
    coalition structure
    Public Good Index
    Opis:
    This paper introduces two variations of the Public Good Index (Holler, 1982) for games with a priori unions. The first one stresses the public good property which suggests that all members of a winning coalition derive equal power. The second variation follows earlier work on the integration of a priori unions (Owen, 1977 and 1982) and refers to essential subsets of an a priori union when allocating power shares. Axiomatic characterizations of both indices are discussed. Numerical examples, one of them taken from a political setting, illustrate the new power indices presented in this paper.
    Źródło:
    Control and Cybernetics; 2010, 39, 3; 839-855
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Oxfordian ammonite genus Passendorferia Brochwicz Lewiński and the Tethyan subfamily Passendorferiinae Meléndez: origin and palaeobiogeography
    Autorzy:
    Mendez, G.
    Atrops, F.
    Bello, J.
    Brochwicz-Lewiński, W.
    Darpa, C.
    Fozy, I.
    Perez-Urresti, I.
    Ramajo, J.
    Sequeiros, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061354.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Upper Jurassic
    ammonites
    paleobiogeography
    West Tethys
    biostratigraphy
    evolution
    Mediterranean Province
    Opis:
    The Oxfordian ammonite group Passendorferiinae (known as "Mediterranean perisphinctids") forms a group of perisphinctids characterized by strongly evolute serpenticone coiling and subcircular to subquadrate whorl section, and forms a lateral divergent branch of the main stem Perisphinctidae. They originated probably from Late Callovian Grossouvriinae (Alligaticeras) and spread mainly in the Mediterranean (Tethyan) Province along the southern margin of Tethys, occasionally reaching the outer areas of epicontinental platforms. Their particular morphological features make them somewhat homoeomorphic with Tethyan Kimmeridgian Nebrodites. The phyletic link might be represented by the genus Geyssantia Meléndez, known from the Late Oxfordian Planula Chronozone. Separate biogeographic distribution in relation to the Perisphinctinae might reflect a progressive differentiation of western Tethyan faunas at the Callovian-Oxfordian boundary and at the onset of the Middle Oxfordian Transversarium Chronozone. Their rapid evolution gives them a biostratigraphic value similar to that of the Perisphinctinae. At the turn of the Middle-Late Oxfordian they gave rise to early Ataxioceratinae (Orthosphinctes), which replaced the Perisphinctinae in epicontinental areas, and colonised the marginal epicontinental blocks of northern Tethys. The taxonomy of this group is based upon the recognition of sexual dimorphism, using a single generic and specific name for both (M) and (m), and hence rejecting the use of former subgeneric ames for both dimorphs. A new species within this line: Passendorferia nodicostata sp. nov. from the Plicatilis Biozone (Paturattensis Subbiozone) is defined and described for the first time.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 113-134
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid Learning of Interval Type-2 Fuzzy Systems Based on Orthogonal Least Squares and Back Propagation for Manufacturing Applications
    Autorzy:
    Mendez, G.
    Hernandez, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/384517.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    type-2 fuzzy inference systems
    type-2 neuro-fuzzy systems
    hybrid learning
    uncertain rule-based fuzzy logic systems
    Opis:
    This paper presents a novel learning methodology based on the hybrid algorithm for interval type-2 (IT2) fuzzy logic systems (FLS). Since in the literature only back-propagation method has been proposed for tuning of both antecedent and consequent parameters of type-2 fuzzy logic systems, a hybrid learning algorithm has been developed. The hybrid method uses recursive orthogonal least-squares method for tuning of consequent parameters as well as the back-propagation method for tuning of antecedent parameters. The systems were tested for three types of inputs: a) interval singleton b) interval type-1 (T1) non-singleton, c) interval type-2 non-singleton. The experimental results of the application of the hybrid interval type-2 fuzzy logic systems for scale breaker entry temperature prediction in a real hot strip mill were carried out for three different types of coils. They proved the feasibility of the systems developed here for scale breaker entry temperature prediction. Comparison with type-1 fuzzy logic systems shows that the hybrid learning interval type-2 fuzzy logic systems improve performance in scale breaker entry temperature prediction under the tested condition.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 1; 23-32
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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