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    Wyświetlanie 1-7 z 7
    Tytuł:
    Evaluation of two alternative procedures for measuring airflow resistance of sound absorbing materials
    Autorzy:
    del Rey, R.
    Alba, J.
    Arenas, J. P.
    Ramis, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/176777.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    material characterization
    airflow resistance
    sound absorbing materials
    eco-friendly material
    Opis:
    It is well known that sound absorption and sound transmission properties of open porous materials are highly dependent on their airflow resistance values. Low values of airflow resistance indicate little resistance for air streaming through the porous material and high values are a sign that most of the pores inside the material are closed. The laboratory procedures for measuring airflow resistance have been stan- dardized by several organizations, including ISO and ASTM for both alternate flow and continuous flow. However, practical implementation of these standardized methods could be both complex and expensive. In this work, two indirect alternative measurement procedures were compared against the alternate flow standardized technique. The techniques were tested using three families of eco-friendly sound absorbent materials: recycled polyurethane foams, coconut natural fibres, and recycled polyester fibres. It is found that the values of airflow resistance measured using both alternative methods are very similar. There is also a good correlation between the values obtained through alternative and standardized methods.
    Źródło:
    Archives of Acoustics; 2013, 38, 4; 547-554
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Inverse Method to Obtain Porosity, Fibre Diameter and Density of Fibrous Sound Absorbing Materials
    Autorzy:
    Alba, J.
    del Rey, R.
    Ramis, J.
    Arenas, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/177007.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound absorption
    fibrous materials
    porous material
    material characterization
    Opis:
    Characterization of sound absorbing materials is essential to predict its acoustic behaviour. The most commonly used models to do so consider the flow resistivity, porosity, and average fibre diameter as parameters to determine the acoustic impedance and sound absorbing coefficient. Besides direct experimental techniques, numerical approaches appear to be an alternative to estimate the material's parameters. In this work an inverse numerical method to obtain some parameters of a fibrous material is presented. Using measurements of the normal incidence sound absorption coefficient and then using the model proposed by Voronina, subsequent application of basic minimization techniques allows one to obtain the porosity, average fibre diameter and density of a sound absorbing material. The numerical results agree fairly well with the experimental data.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 561-574
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Evaluation of the Vibration Reduction Index for Structural Joints
    Autorzy:
    Ramis, J.
    Segovia, E.
    Alba, J.
    Carbajo, J.
    Godinho, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/177736.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    finite element model
    vibration reduction
    structural joints
    Opis:
    The present paper addresses the analysis of structural vibration transmission in the presence of struc- tural joints. The problem is tackled from a numerical point of view, analyzing some scenarios by using finite element models. The numerical results obtained making use of this process are then compared with those evaluated using the EN 12354 standard vibration reduction index concept. It is shown that, even for the simplest cases, the behavior of a structural joint is complex and evidences the frequency dependence. Comparison with results obtained by empirical formulas reveals that those of the standards cannot accurately reproduce the expected behavior, and thus indicate that alternative complementary calculation procedures are required. A simple methodology to estimate the difference between numerical and standard predictions is here proposed allowing the calculation of an adaptation term that makes both approaches converge. This term was found to be solution-dependent, and thus should be evaluated for each structure.
    Źródło:
    Archives of Acoustics; 2012, 37, 2; 189-197
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advances in parallel heterogeneous genetic algorithms for continuous optimization
    Autorzy:
    Alba, E.
    Luna, F.
    Nebro, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/907622.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    algorytm genetyczny
    optymalizacja ciągła
    konwergencja przedwczesna
    parallel genetic algorithms
    continuous optimization
    premature convergence
    heterogeneity
    Opis:
    In this paper we address an extension of a very efficient genetic algorithm (GA) known as Hy3, a physical parallelization of the gradual distributed real-coded GA (GD-RCGA). This search model relies on a set of eight subpopulations residing in a cube topology having two faces for promoting exploration and exploitation. The resulting technique has been shown to yield very accurate results in continuous optimization by using crossover operators tuned to explore and exploit the solutions inside each subpopulation. We introduce here a further extension of Hy3, called Hy4, that uses 16 islands arranged in a hypercube of four dimensions. Thus, two new faces with different exploration/exploitation search capabilities are added to the search performed by Hy3. We analyze the importance of running a synchronous versus an asynchronous version of the models considered. The results indicate that the proposed Hy4 model overcomes the Hy3 performance because of its improved balance between exploration and exploitation that enhances the search. Finally, we also show that the async Hy4 model scales better than the sync one.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 317-333
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economic and environmental viability of building recovery in Seville (Spain). Phase 1: database in Arcgis
    Autorzy:
    Alba-Rodríguez, D.
    Marrero, M.
    Solís-Guzmán, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/344719.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
    Tematy:
    renovation
    rehabilitation
    demolition
    environmental viability
    cost evaluation
    Opis:
    The main objective of this work is the design of a model for the technical, economic and environmental evaluation in the rehabilitation and renovation of buildings versus their demolition. A first analysis is performed on the rehabilitation and renovation of buildings versus their demolition in the historical centre of Seville, Spain. Considering that many European cities have a historical centre that in many cases also represents the most authentic part of the city, this project can be adopted as an assessment tool for many similar case studies. In a first stage, a database for Seville, Spain, has been created using ArcGIS, which identifies those buildings needing restoration. The house of tomorrow maybe the one we already inhabit by transforming it with the renovations necessary in order to make it more safe, secure, energy efficient and comfortable, finally transforming it into a contemporary dwelling, even if they are part of a historical city centre.
    Źródło:
    Środowisko Mieszkaniowe; 2013, 11; 297-302
    1731-2442
    2543-8700
    Pojawia się w:
    Środowisko Mieszkaniowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Miocene dispersal of the lizard Varanus into Europe: Reassessment of vertebral Material from Spain
    Autorzy:
    Delfino, M.
    Rage, J.-C.
    Bolet, A.
    Alba, D.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/22240.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Iberovaranus Hoffstetter, 1969 was erected as a monotypic genus of varanine varanid lizard on the basis of a single trunk vertebra from the Miocene of Spain. Thanks to the study of the holotype, as well as of a still undescribed cervical vertebra from the same locality, we show that the vertebral morphology of Iberovaranus is contained within the known variability of Varanus. Therefore, Iberovaranus Hoffstetter, 1969 is considered a subjective junior synonym of Varanus Merrem, 1820, and the species Iberovaranus catalaunicus Hoffstetter, 1969 should be considered a nomen dubium.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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