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1

Reflection of PlaneWaves at Micropolar Piezothermoelastic Half-space

Kumar R., Sharma N., Lata P., Marin M.

Computational Methods in Science and Technology

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2018

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Vol. 24, No. 2

113--124

EN

A problem of reflection at a free surface of micropolar orthotropic piezothermoelastic medium is discussed in the present paper. It is found that there exist five type plane waves in micropolar orthotropic piezothermoelastic medium, namely quasi longitudinal displacement wave (quasi LD wave), quasi thermal wave (quasi T wave), quasi CD-I, quasi CD-II wave and electric potential wave (PE wave). The amplitude ratios corresponding to reflected waves are obtained numerically. The effect of angle of incidence and thermopiezoelectric interactions on the reflected waves are studied for a specific model. Some particular cases of interest are also discussed.

2

The effect of heat laser pulse on generalized thermoelasticity for micropolar medium

Othman M. I. A., Marin M.

Mechanics and Mechanical Engineering

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2017

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Vol. 21, nr 4

797--811

EN

We introduced the coupled theory, Lord-Schulman theory with one relaxation time and Green-Lindsay theory with two relaxation times to study the influence of thermal loading due to laser pulse on generalized micropolar thermoelasticity. The bounding plane surface is heated by a non-Gaussian laser beam with the pulse duration of 8 ps. The methodology applied here is the use of normal mode analysis to solve the problem of thermal loading due to laser pulse to obtain the exact expressions for the displacement components, force stresses, temperature, couple stresses and microrotation. The distributions of the considered variables are illustrated graphically. Comparisons are made with the results predicted by three theories in the presence of laser pulse and for different values of time.

3

Modelling Search Engines Performance Using Coloured Petri Nets

Gil-Costa V., Marin M., Inostrosa-Psijas A., Lobos J., Bonacic C.

Fundamenta Informaticae

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2014

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Vol. 131, nr 1

139--166

EN

This paper proposes using Coloured Petri Nets to model performance of vertical search engines for Web search. In such systems, queries submitted by users or client systems are handled by different components implemented as services deployed on large clusters of dedicated processors. We propose models that represent key features of components running time cost at a suitable level of detail. A comprehensive evaluation study is presented to reveal good precision of models when compared against actual implementations and complex process-oriented simulators of the same search engine instances. A C++ class library is proposed to enable rapid model construction by using a hierarchical and scalable approach, and to enable transparent generation and efficient execution of respective simulation programs either sequentially or in parallel.