Vol. 20, No 3, 2016 < Volumes
(ISSN 1428-6394)

Contents:

  • Krzysztof W. Wojciechowski and Wojciech Kempinski Auxetics as Entropy Filters — Possible Application   abstract | full text
  • Leonardo Pasini, Francesco Maria Rietti and Fabrizio Allegretto Vehicular Traffic Simulations: Use of a Games Engine for Video Rendering and Verification of an Architecture Model Based on Queuing Systems   abstract | full text
  • Olha Chernukha and Yurii Bilushchak Mathematical Modeling of Random Concentration Field and Its Second Moments in Semispace with Erlangian Distributions of Layered Inclusions   abstract | full text

Abstracts:

hKrzysztof W. Wojciechowski and Wojciech Kempinski Auxetics as Entropy Filters — Possible Application

In this note a sketch of the idea of applying auxetics to separation of 3 He from a mixture of 4 He and 3 He by using auxetic entropy filters is presented.

 

hLeonardo Pasini, Francesco Maria Rietti and Fabrizio Allegretto Vehicular Traffic Simulations: Use of a Games Engine for Video Rendering and Verification of an Architecture Model Based on Queuing Systems

In a previous work [Pasini L and Sabatini S 2016 TASK Quart. 20 (1) 9], we described a technique that allows a specific system of urban traffic to be associated to a description file system, called Model.dat. This file contains a list of data objects that are defined in the library [Pasini L and Feliziani S 2013 TASK Quart. 17 (3) 155] and that form the architecture model of a vehicular traffic system. This model turns out to be a network of queuing systems. In this work, we illustrate how we adapted the old procedure to study a new urban traffic system. Moreover, through a new tracking procedure, we illustrate how we developed a graphic simulation able to reinterpret the data from the simulation of the queuing networks model, in order to make it easier to check the effectiveness of the simulator and to have a graphical way to analyze the data.

 

hOlha Chernukha and Yurii Bilushchak Mathematical Modeling of Random Concentration Field and Its Second Moments in Semispace with Erlangian Distributions of Layered Inclusions

The processes of admixture diffusion in a two-phase stratified semispace with random disposition of syblayers are studied by the approach where internal random nonhomogeneities are considered as inner sources and the solution is found in the form of a Neumann series. The diffusion equations are formulated for one-connected regions of each phase and non-ideal contact conditions for the concentration on interphases are imposed. By the theory of generalized functions the contact problem is reduced to the equation of mass transfer in the whole body, which operator includes explicitly jump discontinuities of the concentration function and its derivatives. The obtained initial-boundary value problem of mass transfer is reduced to the equivalent integro-differentual equation. The solution is constructed in the form of a Neumann series and averaged over the ensemble of phase configurations with Erlangian and exponential distributions of inclusions. Dispersion and the two-point correlation function of the concentration field for diffusion are determined taking into account the probable distribution of inclusions, pair interaction of sublayers and the function of phase correlation. The dependence of the behavior of the averaged admixture concentration, field dispersion and the correlation function in the semispace with Erlangian and exponential distributions of inclusions on different medium characteristics is investigated and established.

 

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