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

100%

Othman M. I. A. , Marin M.

Mechanics and Mechanical Engineering

2017

tom Vol. 21, nr 4

797--811

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.

Reflection of PlaneWaves at Micropolar Piezothermoelastic Half-space

80%

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

Computational Methods in Science and Technology

2018

tom Vol. 24, No. 2

113--124

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.

Modelling Search Engines Performance Using Coloured Petri Nets

70%

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

Fundamenta Informaticae

2014

tom Vol. 131, nr 1

139--166

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.

Comparision of the compositions, antimicrobial and antioxidant activities of essential oils from the endemic species Thymus malyi Ronninger and Thymus lykae Degen et Jav.

70%

Marin M. , Novakovic M. , Tesevic V. , Kolarevic S. , Vukovic-Gacic B.

Acta Scientiarum Polonorum. Hortorum Cultus

2018

tom 17

nr 5

In this study, we compared the compositions, antimicrobial and potential antioxidant activities of essential oils of two Thymus endemic, wild-growing species – T. malyi Ronninger and T. lykae Degen et Jav. No information about its composition and biological activities of oils has been reported to the present day. Forty three compounds were identified from T. malyi and major component was α-pinene (26.4%). In the case of T. lykae, forty four compounds were identified, with geranyl acetate (35.1%) as the main component. Antioxidant activities of the oils were evaluated using DPPH assay. The antimicrobial effect of essential oils were tested against Gram-negative, Gram-positive bacteria, and two fungi. Results indicated higher antibacterial activity of the essential oils of T. lykae in comparison with T. malyi, while for antifungal activity, it was reverse. The essential oils from T. malyi and T. lykae possess antioxidant and antimicrobial activities and could be used as a potential source of natural antioxidants for the food industry.