Milena Petkovic

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OBJECTIVES The aim of this study was to investigate the importance of aPL type and level for non-criteria-related events in APS patients. METHODS Our study included 374 patients: 260 with PAPS and 114 with APS associated with systemic lupus erythematosus (SLE). RESULTS We discovered significant connection between migraine and LA absence, livedo(More)
Stability of three hydrogen-bonded and six stacked 1-methylthymine (1 mT) dimers was studied with the DFT-D3 method at various temperatures. It was demonstrated that the stacked dimers are slightly less stable than the hydrogen-bonded counterparts. Existence of T-shaped dimers is addressed. Anharmonic couplings that involve N-H stretching modes of the nine(More)
Stacking interactions in thymine dimers are studied with density functional theory. According to our calculations, six dimers of comparable stability can be prepared at low temperature, but dimerization is impossible at room temperature due to the large entropy contribution that accompanies it. Analysis of vibrational anharmonic coupling terms shows that(More)
In this paper, Support Vector Machines (SVMs) are applied in predicting electrical energy consumption in the atmospheric distillation of oil refining at a particular oil refinery. During cross-validation process of the SVM training Particle Swarm Optimization (PSO) algorithm was utilized in selection of free SVM kernel parameters. Incorporation of PSO into(More)
Anharmonic force fields are a suitable means for identification of vibrational degrees of freedom responsible for the peculiar shape of molecular spectra and the existence of diverse relaxation pathways. In this contribution, we investigated interactions that govern the position of the O-H stretching band in phenol and its dimers with water and ammonia.(More)
Chlorophylls have been extensively investigated both experimentally and theoretically owing to the fact that they are essential for photosynthesis. In the reported study, two forms of chlorophyll, chlorophyll a and chlorophyll b, were investigated by means of the density functional theory. Optimization of the S0, S1 and T1 states was performed with the(More)
Vibrational properties of molecules composed solely of highly electronegative atoms are studied by means of density functional methods. Performance of different combinations of exchange and correlation functionals is tested. It is demonstrated that certain functionals can successfully simulate infrared spectra of systems containing only fluorine, oxygen and(More)
Because of the presence of polar groups in picolinamide, its aqueous solvation is characterized by formation of multiple hydrogen bonds, which are responsible for differences in vibrational spectra of picolinamide in the gas phase and its aqueous solution. In this contribution, we try to identify dominant interactions between the solute and the solvent(More)
In this paper, Support Vector Machines (SVMs) are applied in predicting energy consumption in the first phase of oil refining at a particular oil refinery. During cross-validation process of the SVM training Particle Swarm Optimization (PSO) algorithm was utilized in selection of free SVM parameters, widths of radial basis functions to be exact.(More)