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    Wyświetlanie 1-3 z 3
    Tytuł:
    Model of line-of-sight ultraviolet propagation
    Autorzy:
    Li, B.
    Wang, Hongbo
    Mao, Z.
    Dong, Z.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174219.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultraviolet communication
    bipyramid model
    scattering characteristic
    line-of-sight (LOS) communication mode
    Opis:
    The traditional line-of-sight ultraviolet model cannot serve better for link performance study for the reason that the scattering characteristic is often ignored in the modelling process. Therefore, a line-of-sight ultraviolet bipyramid model in combination with transceiver full beam angles and geometrical relationship of the transceiver field of view intersection is established. The theoretical rationality of the bipyramid model in comparison with a traditional line-of-sight model is demonstrated by the classically analytical model for line-of-sight scenario. Based on a bit error rate requirement of voice communication, the effects of transmitting power versus range for three line-of-sight ultraviolet communication modes are further analyzed.
    Źródło:
    Optica Applicata; 2014, 44, 4; 601-610
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing Eccentricity-Based Graph Invariants
    Autorzy:
    Hua, Hongbo
    Wang, Hongzhuan
    Gutman, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/31348117.pdf
    Data publikacji:
    2020-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    eccentricity (of vertex)
    Zagreb eccentricity index
    eccentric distance sum
    connective eccentricity index
    Opis:
    The first and second Zagreb eccentricity indices (EM1 and EM2), the eccentric distance sum (EDS), and the connective eccentricity index (CEI) are all recently conceived eccentricity-based graph invariants, some of which found applications in chemistry. We prove that EDS ≥ EM1 for any connected graph, whereas EDS > EM2 for trees. Moreover, in the case of trees, EM1 ≥ CEI, whereas EM2 > CEI for trees with at least three vertices. In addition, we compare EDS with EM2, and compare EM1, EM2 with CEI for general connected graphs under some restricted conditions.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2020, 40, 4; 1111-1125
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Analysis of Ultrasonic Composite Transducer with a Quarter-wave Taper Transition Horn
    Autorzy:
    Chen, Tao
    Li, Hongbo
    Wang, Qihan
    Ye, Junpeng
    Powiązania:
    https://bibliotekanauki.pl/articles/1953535.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    equivalent circuit
    composite transducer
    quarter-wave
    prestressed bolt
    finite element analysis
    Opis:
    Based on the electromechanical equivalent circuit theory, equations related to the resonance frequency and the magnifying coefficient of a quarter-wave vibrator and a quarter-wave taper transition horn were deduced, respectively. A series of 3D models of ultrasonic composite transducers with various conical section length was also established. To reveal the influences of the conical section length and the prestressed bolt on the dynamic characteristics (resonance frequency, amplitude, displacement node, and the maximum equivalent stress) of the models and the design accuracy, finite element (FE) analyses were carried out. The results show that the addition of prestressed bolt increases the resonance frequency and causes the displacement node on the center axis to move towards the small cylindrical section. As the conical section length rises, the increment of resonance frequency reduces and tends to a stable value of 360 Hz while the displacement of the node on the center axis becomes lager and gradually approaches 1.5 mm. Furthermore, the amplitude of the output terminal is stable at 16.18 µm under 220 V peak-topeak (77.8 VRMS) sinusoidal potential excitation. After that, a prototype was fabricated and validated experiments were conducted. The experimental results are consistent with that of theory and simulations. It provides theoretical basis for the design and optimization of small-size, large-amplitude, and high-power composite transducers.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 687-697
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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