The inversion of matrix is widely used in many scientific applications and engineering calculations and this operation requires a large number of computational efforts and storage space. In order to reduce the consumed time and to increase efficiency, a parallel algorithm for matrix inversion based on classic Gauss-Jordan elimination with pivoting is proposed. Upon the multi-core DSPs platform,...

Calculations of energy efficiency of several AACbased building envelopes under different climatic conditions are presented. As thermal insulating materials, expanded polystyrene and hydrophobic and hydrophilic mineral wools are assumed. The computations are accomplished using computer code HEMOT developed at Department of Materials Engineering, Faculty of Civil Engineering at the Czech Technica...

The radiation efficiency of an acoustically thick circular cylindrical shell has been examined by calculations using the boundary element method for three different boundary conditions, and by conducting experiments using point excitation with the boundary conditions being free at both ends. Both the numerical and experimental results indicate that the radiation efficiency attains a value of un...

for three different back surface recombination velocities (BSRV). The calculations reveal that the carrier lifetime limits the screen-printed (SP) EFG Si cell efficiency for lifetimes below -30 /-Is. For a 300 /-1m thick device, the carrier lifetime should be greater than 30 /-Is to realize the full benefit of a low BSRV. Therefore, lifetime enhancement is essential for achieving high efficienc...

The aim of this paper is to present the implementation of the method for solving linear interval equations using the “interval extended zero” method and multimedia extensions. The “interval extended zero” method allows us to reduce the undesirable excess width effect. Its efficiency was proven before and here we show that it can be used to perform fast calculations using multimedia extensions. ...

The elastic and rearrangement processes in the four nucleon system with two clusters in the initial and final states can be treated adequately in framework of Yakubovsky differential equations (YDE) approach. Unfortunately, a direct application of YDE to the scattering problem requires huge computer resources. It is why, new methods allowing a reduction of comlexity of YDE are of interests from...

In this study, the overall performance of air PV/T, based on energy and exergy analysis has been investigated. Two combinations of air PV/T, which consist of unglazed and glazed air PV/T, are considered. Thermal analysis and numerical calculations were carried out, and the performance parameters of the system for the climate conditions of Kerman were studied. The results are presented in graphs...

To improve teachers’ productivity, factors involved need to be identified and strengthened. To this end a conceptual model was initially constructed and then modified based on the feedback given by 12 experts. The final model consisted of three dimensions or topics, four sub topics, 22 concepts, or constituents, and 79 indices. The input dimension included subtopics of cognitive and behavioral ...

Gas phase and aqueous phase quantum chemical calculations for the inhibition efficiency of some substituted Benzothiazole (BTH) and its 2-methyl (MeBTH), 2-amino (ABTH), 2-mercapto (MBTH) and 2-phenyl (PhBTH) as corrosion inhibitors for brass in HClO4 were investigated by means of the AM1, PM6, MNDO and RM1 semi-empirical SCF molecular orbital methods. The calculated quantum chemical parameters...

We present a simple quantum-field model for photon frequency conversion processes in dispersive dielectric microcavities, allowing practical calculations of conversion rates and efficiency optimization. The model incorporates the effect of dispersion into the structure of spatial cavity eigenmodes, while the material nonlinear properties enter the calculations through the coupling coefficients....