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Convergence and stability of finite difference methods for the analysis of theultrasonic wave propagation
No full textComparison of different methods for the computer simulation of the ultrasonic wave propagation in multilayers
No full textSimulation of the wave propagation in 1-D Zener's attenuative media
No full textComputer simulation techniques, such as the Local Interaction Simulation Approach (LISA), can predict accurately and efficiently the propagation of acoustic and ultrasonic waves or pulses even in complex heterogeneous and anisotropic media. For a quantitative comparison with experimental results it is, however, necessary to properly include in the model the attenuation and dispersion properties of the propagation media. This is an interesting problem, even at the 1D level, due to the variety of models, which have been proposed to treat different classes of materials, and to the difficulty of solving, analytically or numerically, the corresponding equations, except in the simplest cases. In this paper Zener's and other kinds of attenuative materials are examined in detail and an optimal discretization scheme is found, which yields stable and convergent simulations of the propagation mechanism. To illustrate the procedure several examples of propagation of monochromatic waves and pulses in different attenuative media are presente
EVALUATION OF THE PHYSICAL PARAMETERS OF THE PRINCIPAL GROWTH STAGES OF THE HUMAN BODY AND THEIR INTERPRETATION
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ON THE EVALUATION OF THE PARAMETERS OF THE BASIC STAGES OF THE HUMAN BODY GROWTH. II. ANALYSIS OF THE HIGH-VOLUME STATISTICS DATA
No full textIDENTIFICATION ATTEMPT OF THE MAIN STAGES OF HUMAN BEING GROWTH AND OF UNIVERSE EVOLUTION
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
ON THE EVALUATION OF THE PARAMETERS OF THE BASIC STAGES OF THE HUMAN BODY GROWTH. I. ANALYSIS OF THE LOW-VOLUME STATISTICS DATA
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