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1
100%
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tom nr 21
7--22
EN
The paper presents an ensemble classification method based on clustering, along with its implementation in the Python programming language. An illustrative example showing the method behavior is provided, and the results of a computational experiment performed on real life data sets are reported.
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tom Vol. 41, no 4
23--61
EN
Identification of working fluids and development of their mathematical models should always precede construction of a proper model of the analysed thermodynamic system. This paper presents method of development of a mathematical model of working fluids in a gas turbine system and its implementation in Python programming environment. Among the thermodynamic parameters of the quantitative analysis of systems, the following were selected: specific volume, specific isobaric and isochoric heat capacity and their ratio, specific enthalpy and specific entropy. The development of the model began with implementation of dependencies describing the semi-ideal gas. The model was then extended to the real gas model using correction factors reflecting the impact of pressure. The real gas equations of state were chosen, namely due to Redlich–Kwong, Peng–Robinson, Soave– Redlich–Kwong, and Lee–Kesler. All the correction functions were derived analytically from the mentioned equations of real gas behaviour. The philosophy of construction of computational algorithms was presented and relevant calculation and numerical algorithms were discussed. Created software allowed to obtain results which were analysed and partially validated.
3
71%
PL
Praca przedstawia proces formułowania modelu elektrolizera alkalicznego z uwzględnieniem stężenia masowego roztworu wodnego KOH. W pracy została przeanalizowana przydatność różnych funkcji do opisu charakterystyk statycznych takiego elektrolizera. Zaproponowano opis matematyczny rozważanych charakterystyk zapewniający uzyskanie wysokiej dokładności modelowania i wykorzystujący stężenie roztworu jako parametr. Przedstawiono sposób automatycznego doboru wartości współczynników w zaproponowanym opisie matematycznym i zoptymalizowano liczbę tych współczynników. Poprawność modelowania zweryfikowano doświadczalnie w szerokim zakresie zmian stężenia roztworu.
EN
This paper presents the process of formulating an alkaline electrolyser model taking into account the mass concentration of KOH aqueous solution. The paper analyzes the usefulness of various functions for the description of the dc characteristics of such an electrolyser. A mathematical description of the considered characteristics has been proposed, ensuring high modeling accuracy and using the solution concentration as a parameter. The method of automatic selection of the values of the coefficients in the proposed mathematical description is presented and the number of these coefficients is optimized. The correctness of the modeling was verified experimentally in a wide range of changes in the concentration of the solution.
4
Content available remote Isolation and characterisation of crocodile and python ovotransferrins
63%
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2007
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tom 54
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nr 1
175-182
EN
Transferrins play a major role in iron homeostasis and metabolism. In vertebrates, these proteins are synthesised in the liver and dispersed within the organism by the bloodstream. In oviparous vertebrates additional expression is observed in the oviduct and the synthesised protein is deposited in egg white as ovotransferrin. Most research on ovotransferrin has been performed on the chicken protein. There is a limited amount of information on other bird transferrins, and until our previous paper on red-eared turtle protein there was no data on the isolation, sequencing and biochemical properties of reptilian ovotransferrins. Recently our laboratory deposited ten new sequences of reptilian transferrins in the EMBL database. A comparative analysis of these sequences indicates a possibility of different mechanisms of iron release among crocodile and snake transferrin. In the present paper we follow with the purification and analysis of the basic biochemical properties of two crocodile (Crocodilus niloticus, C. rhombifer) and one snake (Python molurus bivittatus) ovotransferrins. The proteins were purified by anion exchange and hydrophobic chromatography, and their N-terminal amino-acid sequences, molecular mass and isoelectric points were determined. All three proteins are glycosylated and their N-glycan chromatographic profiles show the largest contribution of neutral oligosaccharides in crocodile and disialylated glycans in python ovotransferrin. The absorption spectra of iron-saturated transferrins were analysed. Iron release from these proteins is pH-dependent, showing a biphasic character in crocodile ovotransferrins and a monophasic type in the python protein. The reason for the different types of iron release is discussed.
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