Paper brings information on dynamic multiplatform mathematical software GeoGebra produced by Markus Hohenwarter in 2002 for learning and teaching mathematics, available free on web in 45 languages. GeoGebra enables production of self-standing dynamic worksheets as interactive java applets embedded in html pages presenting dynamic constructions and interactive calculations on Internet Thus it is...

A pattern recognition quantitative structure-activity relationship (QSAR) study has been performed to determine the molecular features of carbamate anticonvulsants which influence biological activity. Although carbamates, such as felbamate, have been used to treat epilepsy, their mechanisms of efficacy and toxicity are not completely understood. Quantum and classical mechanics calculations have...

Plane waves and Confined Localized Orbitals have been used to construct a new mixed basis for electronic structure calculations. Confinement is a mathematical transformation which smoothly suppresses the tails of the atomic orbitals. This eliminates multicentre integrals in the expressions for the matrix elements. Using self-consistent potentials supplied by the linear muffin tin orbital method...

The article investigates the numeric simulation of two-way aeroelastic processes applied to the experimental phase of a compressor; physical, mathematical, rigid and grid models of the system “gas – rotor – stator” have been worked out; 2 FSI (two-way Fluid-Structure Interaction) calculations have been performed on the evaluation of the interaction between a gas-dynamic flow and a deformable ro...

the thermodynamic functions such as enthalpy (h), gibbs free energy (g) and entropy (s) ofpyrazole was theoretically studied at 5 different temperatures 25, 30, 35, 40 and 45°c by usinggussian o3, software. first, the structural optimization of isolated pyrazole was done in the gas phaseby appling the density functional theory (b3lyp) level with 3-21g, 6-31g and 6-31+g(d) basissets. moreover, v...

This paper considers the problem of optimal structural business process model choice in a telecommunications company using mathematical methods and mathematical model construction. For modelling this problem a hierarchical structure is proposed due to a number of advantages. The paper offers a modified Analytic Hierarchy Process method to solve the given problem that leads to gaining adequate r...

A survey is given on the new 2-- and 3--loop results for heavy flavor contributions to deep--inelastic scattering in unpolarized polarized case. We also discuss related mathematical aspects applied these calculations.

In a tinplate line the coating thickness can be controlled by means of the line speed and current applied. A control strategy has been developed that calculates the maximum possible speed and the total necessary current, distributing it into the available rectifiers. The equations used for the calculations are based on a mathematical model obtained using Genetic Programming. Copyright ©’2002’ I...