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1
Content available Measurement of hydrogen storage capacity in Ca72Mg28 alloy
Brestovič T., Jasminská N., Lázár M., Saks K., Bednárová L., Šulíková M., Čarnogurská M.
Advances in Science and Technology. Research Journal
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2017
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Vol. 11, no 4
103--110
EN
This article discusses the measurement of hydrogen storage capacity in Ca72Mg28 alloy that has been produced by melt spinning. The alloy has an amorphous structure in which there is an assumption of hydrogen storage of acceptable concentration. The research is to analyse the possibility of desorption of the gas without recrystallization of the alloy. Subsequently, the problem of reversible hydrogen storage is examined at temperatures between 410–450 °C in the pressure range 0 to 3.5 MPa. This paper deals with the indirect determination of the amount of heat generated in the absorption of hydrogen by using the calorimetric method. In the conclusion there is a comparison of the storage capacity of hydrogen in the amorphous and crystalline structure of the alloy.
2
Content available Application of analytical solution for extended surfaces on curved and squared ribs
Brestovič T., Jasminská N., Lázár M.
Acta Mechanica et Automatica
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2015
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Vol. 9, no. 2
75--83
EN
The presented article discusses how to increase heat transfer through ribbed surfaces and it is oriented to the mathematical representation of temperature fields and the total thermal flow. The complexity of solving for some types of ribs with variable cross-section requires the application of numerical methods, which are applied consequently to the planar rib as well. In this case there was chosen the finite-difference method (FDM). During solution of the cylindrical ribs the FDM method is preferably used directly with regard to the complexity of solving for infinite sums and improper integrals in Bessel functions. In conclusion is assessed the application suitability of the calculation procedure applied to curved ribs. This procedure is usually used to planar ribs. At the same time it is pointed out the possibility of using this method for calculation of the total thermal flow through cylindrical ribs, which have got the squared form.
3
Content available The Effect of Temperature Pyrolysis Process of Used Tires on the Quality of Output Products
Jasminská N., Brestovič T., Čarnogurská M.
Acta Mechanica et Automatica
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2013
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Vol. 7, no. 1
20-25
EN
Pyrolysis together with gasification and combustion create a group of so called thermic processes. Unlike the combustion it is based on thermic decomposition of organic materials without any access of oxidative media. Within the pyrolytic process, three main fractions are created: solid residue, pyrolytic gas and organic liquid product - pyrolytic oil. The presented article examines the effects of pyrolysis operational conditions (above all, temperature) on gas products, solid residues and liquid fractions.
4
Content available Software support development for numerical solution of ANSYS CFX
Brestovič T., Jasminská N.
Acta Mechanica et Automatica
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2013
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Vol. 7, no. 4
215--221
EN
The paper deals with possibilities to apply a new developed software support for simulation programme ANSYS CFX. A direct export of heat-transfer coefficients into variables used under edge conditions as well as of physical properties of gas mixtures into material properties during simulation solution of technical tasks means a significant saving of time. The paper summarizes in detail description of the software for calculation of heat-transfer coefficient during free convection (HTC-FC) and of material properties of gas mixture (MPGM) that enable to export calculated data directly into the text files which can be imported then into the programme ANSYS CFX.
5
Content available Experiment of Gasification of the Synthetically Mixed Sample of Waste in Nitrogen Atmosphere
Lázár M., Jasminská N., Lengyelová N.
Acta Mechanica et Automatica
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2013
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Vol. 7, no. 1
34-37
EN
New classes of singular fractional continuous-time and discrete-time linear systems are introduced. Electrical circuits are example of singular fractional continuous-time systems. Using the Caputo definition of the fractional derivative, the Weierstrass regular pencil decomposition and Laplace transformation the solution to the state equation of singular fractional linear systems is derived. It is shown that every electrical circuit is a singular fractional systems if it contains at least one mesh consisting of branches with only ideal supercondensators and voltage sources or at least one node with branches with supercoils. Using the Weierstrass regular pencil decomposition the solution to the state equation of singular fractional discrete-time linear systems is derived. The considerations are illustrated by numerical examples.
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