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    Wyświetlanie 1-3 z 3
    Tytuł:
    Application of ultrasonic velocity measurement and thermal analysis for determination of limestone quality
    Autorzy:
    Kilic, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/110569.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    limestone properties
    thermal decomposition
    TG-DTA
    P-wave velocity
    Opis:
    Limestone is an important industrial raw material. It is consumed by chemical and other industries (84%), used as refractory and road construction material (12%) and applied in civil engineering and agricultural applications (4%). Substantial amounts of limestone are also used as lime in the iron and steel industry. The aim of this study was to determine the properties of limestones. The chemical, physical and thermal properties of limestones were determined by standard methods while the P-wave velocities of limestones were measured with an ultrasonic non-destructive tester and relationships between limestone properties were estimated. It was found that there is a statistical correlation between physical properties and the P-wave velocity of limestones. The P-wave velocity is a very good characteristic parameter for the study and estimation of the limestone quality.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 525-534
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of measurement position on brachial–ankle pulse wave velocity
    Autorzy:
    Shimawaki, S.
    Toda, M.
    Nakabayashi, M.
    Sakai, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/306488.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    postawa ciała
    prędkość
    sztywność
    staw kolanowy
    posture
    pulse wave velocity
    vascular stiffness
    knee flexion angle
    Opis:
    Arterial stiffness measurements are primarily used for the early detection of arteriosclerosis. Methods and devices that can easily measure arterial stiffness at home are in demand. We propose a simple method for measuring brachial–ankle pulse wave velocity (baPWV) at home using a reclining chair and investigate the effects of positioning on baPWV measurement. We measured baPWV in 50 healthy men (21–70 years) in seven different measurement positions, including the supine position, sitting, sitting with the knees flexed at 45°, sitting with the knees flexed at 0°, reclining at 37°, reclining at 50°, and standing. BaPWV was significantly lower in the supine position (P < 0.01) than in the other positions. It was significantly higher in the sitting position (P < 0.01) than in the reclining position (37°). No changes in baPWV were seen changing the knee flexion angle alone while sitting. Strong correlations were also observed between baPWV in the supine position and that in other positions. We showed that baPWV in the supine position can be calculated by making corrections to baPWV measured in the sitting position at a reclining angle. Utilizing this corrected value would allow easy measurement at home using a reclining chair.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 1; 111-116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The forward-wave and backward-wave behaviors of electromagnetic waves in two-dimensional photonic crystals
    Autorzy:
    Jiang, P
    Yang, H.
    Xie, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/174438.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    forward-wave behavior
    backward-wave behavior
    negative refraction
    phase velocity
    finite element method simulation
    Opis:
    The negative refractions are discussed in detail to demonstrate two different two-dimensional photonic crystal structures that undergo negative refractions associated with the backward-wave and forward-wave phenomenon, respectively. The presentation of the left-handed property of effective negative index photonic crystal is followed by a discussion of a backward flowing phase and causality. The forward-wave negative refraction occurs in photonic crystals as a result of anisotropy. This paper is based on the theoretical analysis and is illustrated with the results of finite element method simulations.
    Źródło:
    Optica Applicata; 2014, 44, 1; 17-27
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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