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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
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.

Oziemblowski M.,Wrocław University of Environmental and Life Sciences | Drozdz T.,University Rolniczy Im Hugona Kollataja akowie | Wrona P.,University Rolniczy Im Hugona Kollataja akowie
Przeglad Elektrotechniczny | Year: 2013

Pulsed Electric Fields (PEF) are one of the unconventional preservation method of mainly liquid food products like juices, milk or whole eggs. The main inactivation factor of microorganisms is treatment of PEF in range of 10-80 kV/cm what results in electroporation of microorganism's cell and its death, what leads to longer "shell life" of food products. PEF method is especially useful with another methods in the framework of so called "hurdle theory".

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.

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.

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

Special relativity predicts that a spinning object with a constant angular momentum in its rest frame, when transported around an orbit, will undergo the Thomas precession in the laboratory frame. As no torque is applied in the rest frame of the gyroscope, it appears that the principle of conservation of angular momentum is violated. In this paper, we show that in fact the Thomas precession of the gyroscope is accompanied by a torque emerging due to the Lorentz transformation of the force acting on segments of the gyroscope. Using the derived formula for torque, we find the standard expression for the Thomas precession rate. Advantages of our approach compared to a work on the same problem, by Muller (1992 Am. J. Phys. 60 313-317), are discussed. © 2014 IOP Publishing Ltd.

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.

Klimek-Kopyra A.,Agricultural University of Krakow | Zajac T.,Agricultural University of Krakow | Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
European Journal of Agronomy | Year: 2013

Experimental results showing cooperation-competition interactions in dual-component crops for mixtures created from Pisum sativum L. (pea), Vicia sativa L. (spring vetch) and Linum usitatisimum L. (linseed) are studied by means of a mathematical model describing the plant interactions. The model introduces parameters enabling to distinguish competition and cooperation between the species in the crop. The model parameters are established on the basis of the entire vegetation period of plants, so they provide exhaustive characteristics of the plant interactions in the mixtures. The model factors allow the estimation of the mixtures with respect to the final biomass yield as well. The experimental data verify possible economic benefits from the proposed plant mixtures and allow to critically check the beliefs that legumes improve the field productivity. Additionally, for comparison with the biomass yield, the seed yield is analyzed in the respective crops. Especially, it is indicated that the increased biomass yield for linseed in the mixture with a leguminous plant is accompanied with a decrease of the seed yield for this species. As concerns pea in the mixture with linseed, a decrease in the pea biomass was registered when compared to the sole crop but at the same time an increase in the seed yield was achieved in the mixture. No influence on the biomass of the spring vetch was noticed when it was cultivated with linseed but its seed yield appeared to be diminished with respect to the sole crop. © 2013 Elsevier B.V.

Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
Foundations of Physics | Year: 2011

A direct method showing the Thomas precession for an evolution of any vector quantity (a spatial part of a four-vector) is proposed. A useful application of this method is a possibility to trace correctly the presence of the Thomas precession in the Bargmann-Michel-Telegdi equation. It is pointed out that the Thomas precession is not incorporated in the kinematical term of the Bargmann-Michel-Telegdi equation, as it is commonly believed. When the Bargmann-Michel-Telegdi equation is interpreted in curved spacetimes, this term is shown to be equivalent to the affine connection term in the covariant derivative of the spin four-vector evolving in a gravitational field. It then contributes to the geodetic precession. The described problem is an interesting and unexpected example showing that approximate methods used in special relativity, in this case to identify the Thomas precession, can distort the true meaning of physical laws. © 2011 The Author(s).

Rebilas K.,University Rolniczy Im Hugona Kollataja akowie
American Journal of Physics | Year: 2012

This article derives and explains the emergence of one-time-direction macroscopic evolution of a classical system of two mixed gases having different temperatures. The analysis performed at the microscopic level, where the time-symmetric laws of mechanics govern the particle collisions, leads to a time-asymmetric macroscopic heat transfer equation and a theorem analogous to the Boltzmann H-theorem. The velocity distributions of the incoming and outgoing particles should satisfy some statistical symmetries. The time-reversed evolution is highly improbable because it would break these symmetries. Additionally, some remarks explaining implicit time-asymmetry of the Boltzmann Stosszahlansatz (collision number assumption) are made. © 2012 American Association of Physics Teachers.

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