Plamen Pavlov Petrov

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A method is proposed which is based on the comparison of calculation coefficients estimated by eliminating the actual rates of morbidity resulting in temporary disability among workers and employees of some branches of national economy residing in different territories. Calculation algorithms are provided, the use of which is illustrated by relative and(More)
The genetic variability of honey bee populations of three subspecies selectively reared in Poland (A. m. carnica and A. m. caucasica) and Bulgaria (A. m. macedonica-type rodopica) was studied using isoenzyme analysis of six enzyme systems (MDH-1, ME, EST-3, ALP, PGM and HK) corresponding to 6 loci. All loci were found to be polymorphic in the studied(More)
We report the results of a synoptic study of the photometric and spectroscopic variability of the classical T Tauri star AA Tau on timescales ranging from a few hours to several weeks. The AA Tau light curve had been previously shown to vary with a 8.2d period, exhibiting a roughly constant brightness level, interrupted by quasicyclic fading episodes, which(More)