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Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
European Journal of Physics | Year: 2015

A deductive approach to the relativistic law of motion presented by Kosyakov (2014 Eur. J. Phys. 35 025012) is critically analysed. We point out that the Kosyakov argumentation is flawed and ineffective. On the other hand we show how an implicit assumption made by the author could be used to perform a successful reasoning. Also, another method to derive the relativistic equation of motion, in terms of Lorentz-invariant three-vectors, is recalled. © 2015 IOP Publishing Ltd.

The main aim of my research: to determine the frequency of colonisation Streptococcus agalactiae from productive women's vagina, an evaluation of usefulness microbiological diagnostic methods to detect GBS, to define serotype of analysed strains of S. agalactiae. After all, I tried to define fenotypic differential, biochemical and antimicrobial susceptibility between GBS with and without hemolysis. All of strains S. agalactiae (n = 380) belong to bacteria Gram(+), they had B serologic group and didn't produce catalase. On the basis of TSA+5% sheep blood streptococcus with beta-hemolysis grew like a small, grey and shiny colonies with a narrow, bright ring. On the same base we had S. agalactiae without beta-hemolysis, in examine material--6% (n = 22). On the basis of Strepto B ID S. agalactiae grew like a small, round red colonies and on the base Granada agar like an orange, white colonies. The level of colonisation S. agalactiae was 22% (380GBS/1727women). Identification of analysed strains of S. agalactiae was made by test API 20 Strep. The susceptibility was examined to ampicilin, azithromycin, erythromycin, clindamycin, chloramphenicol, doxycyclin, cotrimoxasol, ciprofloxacin. Serotypes III (50%), Ia (18%) and V (14%) prevailed.

Bergel T.,University Rolniczy Im Hugona Kollataja akowie | Kudlik K.,Sadeckie Wodociagi Sp.z.o.o.
Water and Ecology | Year: 2014

The aim of the study was to assess the removal efficiencies obtained with self-cleaning contact filters of DynaSand type for some physicochemical and bacteriological water pollutants. The filters are operated in the Water Treatment Plamt Swiniarsko, which supplies municipal water to the city of Nowy Sacz. The water being subjected to filtration is a mixture of surface and infiltrative waters. The value of the water quality parameters obtained with the DynaSand filters were compared to those achieved with the rapid pressure filters that were in the use before the modernization of the water treatment plant. Analysis of the result makes it clear that since the substitution of the self-cleaning DynaSand filters for the rapid pressure filters, both physicochemical and biological pollutants have been removed with the efficiency required. This means that the users have been supplied with water of desired quality. Although the period under study was characterized by the occurrence of extreme meteorological conditions (floods), the modernized filtration system not only guaranteed a reduction in water turbidity to the average value of 0.3 NTU, a decrease in color intensity to at least 5 gPT/m3, an the removal of iron compounds to the average value of 0.01 gFe/m3 but also provided simultaneous retention of more than 97% of coliform bacteria, and more than 99% of fecal streptococci Enterococcus faecalis or anaerobic spore-forming bacteria of the species Clostridium perfringens.

Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
American Journal of Physics | Year: 2010

Besides the well-known scalar invariants, there also exist vectorial invariants in special relativity. It is shown that the three-vector is invariant under the Lorentz transformation. The subscripts and denote the respective components with respect to the direction of the velocity of the body v , and p is the relativistic momentum. We show that this vector is equal to a force F R, which satisfies the classical Newtonian law F RRa R in the instantaneous inertial rest frame of an accelerating body. Therefore, the relation F RR based on the Lorentz-invariant vectors, may be used as an invariant (not merely a covariant) relativistic equation of motion in any inertial system of reference. An alternative approach to classical electrodynamics based on the invariant three-vectors is proposed. 2010 American Association of Physics Teachers.

Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
American Journal of Physics | Year: 2014

The spin of a gyroscope that undergoes Thomas precession seems to change its direction without any torque, which would mean that conservation of angular momentum is violated. To resolve this paradox, it is shown that the spin dynamics equation describing Thomas precession (the BMT equation) can be written in terms of a torque applied to the spin. A simple method of finding an explicit expression for the torque is presented in the case of a gyroscope performing circular motion. An unexpected oscillatory character of the torque is explained in terms of the difference between the proper spin and the spin observed in the laboratory frame. © 2015 American Association of Physics Teachers.

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