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Jihlava, Czech Republic

Brtnik B.,College of Polytechnics Jihlava
WSEAS Transactions on Circuits and Systems | Year: 2011

Circuits with switched capacitors are described by a capacitance matrix. As there are also graph methods of circuit analysis in addition to algebraic methods, it is clearly possible in theory to carry out an analysis of the whole switched circuit in two-phase switching exclusively by the graph method as well. The phase of switching are called even (E) and odd (O), not 1 and 2 to avoid confusion between the sign of the phases and of the nodes. For this purpose it is possible to plot a Mason graph of a circuit, use two graphs to reduce oriented graphs for all the four phases of switching, and then plot a summary MC-graph from charge and voltage graphs. Summary MC-graph is now constructed by the incomplete common skeletons of the V-graph and the Q-graph in all four phases, branches obtained for EO and OE phase are drawn between these nodes, while their resulting transfer is multiplied by 2 1 - z to express the delay between the two phases. This summary MC-graph can then be interpreted by the Mason's relation to provide transparent voltage transfers, and so it is possible to reach the final result a quite fully graphically. This method can be used for circuits containing operational amplifier with the break point frequency, too, but summa graph is rather complicated in this case, because this description is based on the modified nodal method, where the number of nodes is remains. Source


Rehulka J.,Silesian Museum | Minarik B.,College of Polytechnics Jihlava
Aquaculture Research | Year: 2012

Physiological (reference) value intervals determined by the lower 2.5% and upper 97.5% quantiles were calculated for blood plasma cholesterol (CHOL) and triacylglycerol (TGL) in farmed rainbow trout, Oncorhynchus mykiss, in raceway culture. The fish were given dry pelleted diets that contained 37-47% crude protein and 7-14% crude fat and were kept at a stocking density of 50 kg m -3 in tanks provided with running freshwater at an ambient temperature of 3-16°C and dissolved oxygen, 8.4-11.5 mg L -1. Blood was sampled between September and November at a photoperiod of 9:00-13:00 hours: 11:00-15:00 hours (light:dark). Cholesterol levels were significantly (P = 0.0001) greater in males (4.7-12.1 mmol L -1, n = 34, mean weight 406 ± 138 g) than immature females (3.2-9.7 mmol L -1, n = 386, mean weight 416 ± 147 g). Physiological range for TGL in immature females and males was 2.4-14.4 mmol L -1 (n = 249, mean weight 418 ± 149 g). The distribution and density of the quantiles in the tested reference group were made possible by the use of histograms, which showed normal distributions for CHOL in males and in females, but not for TGL, in which a sinistral asymmetry was found. Correlation and regression analyses indicated significant (P = 0.0000) dependence between the CHOL and total protein (r 2 = 76.2%), CHOL and Fulton's condition factor (r 2 = 43.3%) and CHOL and absolute weight of liver (r 2 = 45.5%). Fluctuation in cholesterolaemia and triacylglycerolaemia, depending on nutrition and the aquaculture method is discussed below. © 2011 Blackwell Publishing Ltd. Source


Circuits with switched capacitors are described by a capacitance matrix and seeking voltage transfers then means calculating the ratio of algebraic supplements of this matrix. As there are also graph methods of circuit analysis in addition to algebraic methods, it is clearly possible in theory to carry out an analysis of the whole switched circuit in two-phase switching exclusively by the full graph method as well. In this case the summary graph can be constructed by the transformation graph or two graphs and can be simply evaluated by the Mason's relation. Source


Krejcova J.,College of Polytechnics Jihlava
APLIMAT 2016 - 15th Conference on Applied Mathematics 2016, Proceedings | Year: 2016

The paper discusses the results of the examinations in mathematics at the College of Polytechnics Jihlava. The aim is focused on the differences between the scores of students of different secondary schools. This work is a part of a long-term monitoring, which tests the same students, and monitors their progress. Source


Hojdarova M.,College of Polytechnics Jihlava
APLIMAT 2016 - 15th Conference on Applied Mathematics 2016, Proceedings | Year: 2016

This paper gives basic functions and general principles for effective application of technical diagnostics, which forms a significant part of the whole system of rules for optimal machine operability protection. Evaluation of the normative for the right time of an element renewal helps to increase economy of the whole machine operation and brings financial savings. Source

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