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Wyszukujesz frazę "Christensen, S." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Shape optimization of a loudspeaker diaphragm with respect to soun directivity properties
    Autorzy:
    Christensen, S.
    Olhoff, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/206828.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    akustyka
    metoda elementów brzegowych
    metoda elementów skończonych
    acoustics
    boundary element method
    finite element method
    loudspeaker sound directivity
    optimum design
    Opis:
    This paper presents a novel method for optimizing the directivity of the sound emission from the diaphragm of an electro dynamic loudspeaker. The analysis of the diaphragm is performed by finite element analysis of the structural dynamic behaviour and using the boundary element method for the acoustic analysis. Through optimization of a dead mass distribution on the diaphragm, or of the shape of the mid-surface of the diaphragm, it has been possible to improve its directivity properties for sound emission. Several illustrative examples are presented at the end of the paper.
    Źródło:
    Control and Cybernetics; 1998, 27, 2; 177-198
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of Co Adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
    Autorzy:
    Godowski, P. J.
    Onsgaard, J.
    Christensen, S. V.
    Nerlov, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945414.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Jv
    33.60.-q
    82.80.Pv
    Opis:
    Improved adsorption characteristics of a K predosed Cu(110) surface with a coverage corresponding to a point before the work function minimum have been confirmed. Analysis of the CO-induced orbitals in the photoelectron spectra of the CO/K/Cu(110) interface for low coverages of carbon monoxide adsorbed at 118 K has been done. Noticeable changes of the parameters of the orbitals with increasing CO coverage have been registered. Elongation of the C-O bond without dissociation of the molecule has been deduced from the energetic separation of 3.4 eV between the 4σ and the 1π orbital. A weakening of the CO-interface bond with coverage has been found on the base of decreasing 5σ-1π separation with increasing 4σ/5σ intensity ratio. Perpendicular orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4σ and 5σ/1π orbitals.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 657-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital Image Correlation Techniques for Strain Measurement in a Variety of Biomechanical Test Models
    Autorzy:
    Hensley, S.
    Christensen, M.
    Small, S.
    Archer, D.
    Lakes, E.
    Rogge, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/307418.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    FEM
    cyfrowa korelacja obrazów
    wskaźnik naprężenia
    DIC
    finite element analysis
    digital image correlation
    strain gauges
    Opis:
    Purpose: Previous biomechanical studies have estimated the strains of bone and bone substitutes using strain gages. However, applying strain gages to biological samples can be difficult, and data collection is limited to a small area under the strain gage. The purpose of this study was to compare digital image correlation (DIC) strain measurements to those obtained from strain gages in order to assess the applicability of DIC technology to common biomechanical testing scenarios. Methods: Compression and bending tests were conducted on aluminum alloy, polyurethane foam, and laminated polyurethane foam specimens. Simplified single-legged stance loads were applied to composite and cadaveric femurs. Results Results: Showed no significant differences in principal strain values (or variances) between strain gage and DIC measurements on the aluminum alloy and laminated polyurethane foam specimens. There were significant differences between the principal strain measurements of the non-laminated polyurethane foam specimens, but the deviation from theoretical results was similar for both measurement techniques. DIC and strain gage data matched well in 83.3% of all measurements in composite femur models and in 58.3% of data points in cadaveric specimens. Increased variation in cadaveric data was expected, and is associated with the well-documented variability of strain gage analysis on hard tissues as a function of bone temperature, hydration, gage protection, and other factors specific to cadaveric biomechanical testing. Conclusions: DIC techniques provide similar results to those obtained from strain gages across standard and anatomical specimens while providing the advantages of reduced specimen preparation time and full-field data analysis.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 187-195
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    III-V Semiconducting Nitrides Energy Gap under Pressure
    Autorzy:
    Perlin, P.
    Gorczyca, I.
    Teisseyre, H.
    Suski, T.
    Litwin-Staszewska, E.
    Porowski, S.
    Grzegory, I.
    Christensen, N. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921585.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    Opis:
    In this paper we present overview of our recent experimental and theoretical results concerning electronic band structure of III-V nitrides under pressure. It is shown here that the pressure coefficients of the direct gap for studied nitrides are surprisingly small. To describe tendency in changes of the gap with pressure we use a simple empirical relation.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 674-676
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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