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    Wyświetlanie 1-6 z 6
    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:
    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:
    Enhanced visibility of graphene: the effect of the Brewster angle
    Autorzy:
    Adamson, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/173884.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical characterization
    two-dimensional material
    graphene
    Brewster angle
    differential reflectance
    Opis:
    Visibility and simple optical diagnostics possibilities of graphene layers on dielectric and semiconductor substrates at the Brewster angle are analyzed. The analysis is based on a numerical simulation. Several oxide semiconductors (ITO, ZnO, TiO2), weakly absorbing Si, and strongly absorbing GaAs are considered. It is shown that at the Brewster angle the optical contrast of graphene flakes on a bare semiconductor substrate is actually strong enough to see them under an optical microscope and there is really no need to create an additional interference film on the substrate.
    Źródło:
    Optica Applicata; 2017, 47, 3; 363-372
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metal-ceramic functionally graded materials – manufacturing, characterization, application
    Autorzy:
    Chmielewski, M.
    Pietrzak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200350.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal material
    ceramic material
    functionally graded materials
    manufacturing
    characterization
    application
    tworzywa gradientowe
    materiał metaliczny
    materiał ceramiczny
    produkcja
    charakteryzacja
    aplikacja
    Opis:
    Functionally graded materials (FGMs) belong to a new, continuously developing group of materials, finding application in various branches of industry. The idea of freely designing their construction profile, restricted only by the available manufacturing techniques, enables obtaining materials with composition and structure gradients having unprecedented properties. In this paper, selected results of works carried out by the authors and relating to the application of the developed metal-ceramic composites were presented in order to manufacture functionally graded materials for target purposes. Gradient structures with various construction profiles that can play different roles were produced on the basis on the following material pairs: Cr-Al2O3, NiAl-Al2O3 and Cu-AlN. Manufacturing conditions, microstructure characteristics and selected properties, crucial from the point of view of future applications, were presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 151-160
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of thinning of homogeneous material using active thermography and classification trees
    Autorzy:
    Dudzik, Sebastian
    Dudek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1848987.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active thermography
    classification tree
    defect detection and characterization
    material thinning detection
    Opis:
    Active thermography is an efficient tool for defect detection and characterization as it does not change the properties of tested materials. The detection and characterization process involves heating a sample and then analysing the thermal response. In this paper, a long heating pulse was used on samples with a low thermal diffusivity and artificially created holes of various depths. As a result of the experiments, heating and cooling curves were obtained. These curves, which describe local characteristics of the material, are recognized using a classification tree and divided into categories depending on the material thickness (hole depths). Two advantages of the proposed use of classification trees are: an in-built mechanism for feature selection and a strong reduction in the dimensions of the pattern. Based on the experimental study, it can be concluded that classification trees are a useful tool for the thinning detection of homogeneous material.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 89-105
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O „zakresie przedmiotowym” i „zakresie sytuacyjnym” konwencyjnych norm kolizyjnych. Rozważania na tle art. 35 umowy polsko-ukraińskiej z 1993 r.
    On “Material Scope” and “Spatial Reach” of Conflict-of-laws Rules of an International Agreement. Study on Article 35 of the Agreement of 1993 between Poland and Ukraine
    Autorzy:
    Pacuła, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/20759409.pdf
    Data publikacji:
    2022
    Wydawca:
    Wydawnictwo Uniwersytetu Śląskiego
    Tematy:
    characterization
    material scope
    spatial reach
    bilateral agreement
    agreement of 1993 between Poland and Ukraine
    Opis:
    The conflict-of-laws rules laid down in an international agreement binding Poland and a non-Member State enjoy priority over rules of national origin (where a situation does not fall within the scope of EU conflict-of-laws rules), as well as over EU private international law rules (on the basis of the clauses provided for in the EU Regulations), yet in both cases exclusively in scenarios falling within their own scope of application.With regard to conflict-of-laws rules of a bilateral international agreement, such as those provided for in Article 35 of the Agreement of 1993, the characterization has to be carried out independently from the understanding of specific concepts that may be inferred from national substantive law or from private international law, be it of domestic or EU origin.As to the determination of the “material scope” of such conflict-of-laws rules, the textual interpretation of a bilateral agreement in question should play crucial role. Although the conflict-of-laws rules of such agreements generally call for characterization of the legal institutions established by the legal order of one of the two Contracting States, the comparative study limited to those two legal orders can merely serve as guidance when it comes to the determination of the “material scope” of those conflict-of-laws rules.While it is difficult to formulate generalizable conclusions concerning the “spatial reach” of the conflict-of-laws rules provided for in a bilateral agreement, it can be argued that — in the course of a dispute before a court — the law designed as applicable under Article 35 (1) of the Agreement of 1993 applies to the assessment of tort liability originating in an event that occurred on the territory of Poland or Ukraine, if the individuals involved in the tort have their domicile (seat) on the territory of Poland or Ukraine, and — although this is highly debatable — insofar as they have the nationality of one of these States, provided that all the above-mentioned elements do not link the situation underlying that dispute exclusively with only one of those States.
    Źródło:
    Problemy Prawa Prywatnego Międzynarodowego; 2023, 32; 49-94
    1896-7604
    2353-9852
    Pojawia się w:
    Problemy Prawa Prywatnego Międzynarodowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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