Prohlížení Acta Polytechnica. 2021, vol. 61 dle názvu
Zobrazují se záznamy 1-20 z 72
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A CONCEPTUAL STUDY OF A LIQUID METAL ALLOY IN A DISK-SHAPED MAGNETOHYDRODYNAMICS CONVERSION SYSTEM
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The use of solar-heated liquid metal in a magnetohydrodynamics (MHD) generator provides an alternative and direct conversion method for electric power generation. This prompted the present study to conduct a three-dimensional ... -
ADAPTIVE WAVELETS SLIDING MODE CONTROL FOR A CLASS OF SECOND ORDER UNDERACTUATED MECHANICAL SYSTEMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The control of underactuated mechanical systems (UMS) remains an attracting field where researchers can develop their control algorithms. To this date, various linear and nonlinear control techniques using classical and ... -
AN ANALYSIS OF THE LIQUID FILMS BREAK-UP USING THE COMPUTER VISION TECHNIQUE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The aim of this paper is to introduce a novel approach for analysing the droplet formation in a transonic flow. The method suggested in this work is based on the combination of the measured data from the wind tunnel by an ... -
An Investigation of corrosion of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The aluminium-based hybrid metal matrix composites have noteworthy applications in sub-sea installations, structures of deep-sea crawlers, submarine parts, engine cylinders, drum brakes etc., as they possess high strength, ... -
Antipalindromic numbers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Everybody has certainly heard about palindromes: words that stay the same when read backwards. For instance, kayak, radar, or rotor. Mathematicians are interested in palindromic numbers: positive integers whose expansion ... -
Application of additional insulation to ETICS on surfaces with biocorrosion
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The paper presents partial outputs from an experiment that demonstrated the impact of applying an additional insulation on an existing contact insulation system with a green-algae surface. The aim was mainly to detect the ... -
APPLICATION OF ADVANCED COMBUSTION MODELS IN INTERNAL COMBUSTION ENGINES BASED ON 3-D CFD LES APPROACH
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper deals with the application of advanced simulation techniques for combustion modeling in the case of an internal combustion engine. The main focus is put on models with a high predictive ability hence 3-D CFD was ... -
APPLICATION OF GLOBAL OPTIMIZATION TO PREDICT STRAINS IN RC COMPRESSED COLUMNS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)In this paper, the results of an application of global and local optimization methods to solve a problem of determination of strains in RC compressed structure members are presented. Solutions of appropriate sets of nonlinear ... -
APPLICATION OF RULED SURFACES IN FREEFORM AND GEAR METROLOGY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)An application of two ruled surfaces (i.e., surfaces generated by a motion of a straight line), a surface of hyperbolic paraboloid and a tangent surface of a cylindrical helix in freeform and gear metrology is introduced ... -
Assessment of external interface of autonomous vehicles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The paper deals with the problem of a communication interface between autonomous vehicles (AV) and pedestrians. The introduced methodology for assessing new and existing e-HMI (external HMI) contributes to traffic safety ... -
Assessment of the effectiveness of lubrication of Ti-6Al-4V titanium alloy sheets using radial basis function neural networks
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The aim of the research presented in this article was to determine the value of the friction coefficient using a simple tribological test and to build an empirical model of friction with the use of radial basis function ... -
Bearing capacity of damaged reinforced concrete beams strengthened with metal casing
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Experimental data on the bearing capacity of damaged reinforced concrete beams with the dimensions of 2000×200×100 mm, reinforced with prestressed metal casings, are presented. Damaging in the form of through normal and ... -
Cavitation wear of Eurofer 97, Cr18Ni10Ti and 42HNM alloys
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The microstructure, hardness and cavitation wear of Eurofer 97, Cr18Ni10Ti and 42HNM have been investigated. It was revealed that the cavitation resistance of the 42HNM alloy is by an order of magnitude higher than that ... -
CELL-CENTERED LAGRANGIAN LAX-WENDROFF HLL HYBRID SCHEME ON UNSTRUCTURED MESHES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)We have recently introduced a new cell-centered Lax-Wendroff HLL hybrid scheme for Lagrangian hydrodynamics [Fridrich et al. J. Comp. Phys. 326 (2016) 878-892] with results presented only on logical rectangular quadrilateral ... -
CO2 power cycle chemistry in the CV Řež experimental loop
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Power cycles using carbon dioxide in a supercritical state (sc-CO2) can be used in both the nuclear and non-nuclear power industry. These systems are characterized by their advantages over steam power cycles, e. g., the ... -
Comparision of the walk techniques for fitness state space analysis in vehicle routing problem
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The Vehicle Routing Problem (VRP) is a highly researched discrete optimization task. The first article dealing with this problem was published by Dantzig and Ramster in 1959 under the name Truck Dispatching Problem. Since ... -
COMPUTATIONAL METHODOLOGY TO ANALYZE THE EFFECT OF MASS TRANSFER RATE ON ATTENUATION OF LEAKED CARBON DIOXIDE IN SHALLOW AQUIFERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Exsolution and re-dissolution of CO2 gas within heterogeneous porous media are investigated using experimental data and mathematical modeling. In a set of bench-scale experiments, water saturated with CO2 under a given ... -
Corn starch doped with sodium iodate as solid polymer electrolytes for energy storage applications
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The concern about environmental problems has inspired a of energy storage devices from natural sources. In this study, solid polymer electrolyte (SPE) films made from corn starch doped with different compositions of sodium ... -
COUNTER-ROTATING DUAL ROTOR WIND TURBINE LAYOUT OPTIMISATION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)General energy demand is continuously increasing, thus the energy generating assets need to be optimised for higher efficiency. Wind turbines are no exception. Their maximum efficiency can be determined on a theoretical ... -
Delamination of polyimide in hydrofluoric acid
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Wet etching is a critical fabrication step for the mass production of micro and nanoelectronic devices. However, when an extremely corrosive acid such as hydrofluoric (HF) acid are used during etching, an undesirable damage ...