Browsing Acta Polytechnica. 2022, vol. 62 by Title
Now showing items 6-25 of 66
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Active disturbance rejection control-based anti-coupling method for conical magnetic bearings
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Conical-shape magnetic bearings are currently a potential candidate for various magnetic force-supported applications due to their unique geometric nature reducing the number of required active magnets. However, the bearing ... -
Analysis of factors affecting the efficiency of Jatropha curcas oil as an asphaltene stabiliser
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effect of temperature and applied dose on the efficiency of Jatropha curcas seed oil as an asphaltene stabiliser was studied. Two crude oil samples (light and medium) were used. J. curcas oil was subjected to heating ... -
Analysis of output voltage ripple for dual randomized PWM buck converter operating in continuous and discontinuous conduction modes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Dual Randomized Pulse Width Modulation (DRPWM) is renowned for its better effectiveness than Simple Randomized Pulse Width Modulation (SRPWM) in reducing conducted Electro-Magnetic Interferences (EMI) in power converters. ... -
Analysis of parameters important for indirect drying of biomass fuel
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper focuses on biomass drying for the design and operation of an indirect dryer used in a biomass power plant. Indirect biomass drying is not as well described process as direct drying, especially when used for the ... -
Analytic and Algebraic Methods in Physics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022) -
Applicability of Secondary Denitrification Measures on a Fluidized Bed Boiler
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article compares performance of selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) applied on the same pilot unit, a 500 kW fluidized bed boiler burning Czech lignite. Correlation of the ... -
Application of strut-and-tie models for assessing RC half-joints not complying with current code specifications
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The work described is concerned with an investigation of the effectiveness of the use of strut-and-tie models for the structural assessment of half joints. Such elements form a part of many existing bridges which, although ... -
CFD modelling of a secondary settling tanks: generalization based on database relations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The modelling of a secondary settling tank area using numerical methods has been quite extensively explored and researched by numerous authors and papers. These developed models utilize different approaches, from efforts ... -
CFD simulation of partial channel blockage on plate-type fuel of TRIGA-2000 conversion reactor core
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A nuclear reactor cooling system that has been operating for a long time can carry some debris into a fuel coolant channel, which can result in a blockage. An in-depth two-dimensional simulation of partial channel blockage ... -
Complex topological soliton with real energy in particle physics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We summarise the procedure used to find the classical masses of Higgs particle, massive gauge boson and t’Hooft-Polyakov monopole in non-Hermitian gauge field theory. Their physical regions are explored, and the mechanism ... -
Concrete lintels reinforced with steel fibres oriented by a magnetic field
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper explores the possibility of applying the technique of magnetic orientation of steel fibres for manufacturing a concrete structural element of realistic dimensions, compared to small laboratory specimens. This ... -
Conserved quantities in non-hermitian systems via vectorization method
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Open classical and quantum systems have attracted great interest in the past two decades. These include systems described by non-Hermitian Hamiltonians with parity-time (PT) symmetry that are best understood as systems ... -
Conversion of units of length from the Czech state standard to the geodetic baseline Javoriv
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Modern society cannot do without high quality geospatial data. This need constantly strengthens with the growth of the information society and the emerging cyber society. Validity and quality of geospatial data is strongly ... -
Cyclic response of RC beam-column joints strengthened with transverse steel bars and with C-FRP diagonal ties
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The use of additional bars, internally placed through drill holes, in external beam-column connections subjected to cyclic loading, as shear reinforcement is experimentally investigated.The presented experimental work ... -
Design and simulation of a bearing housing aerospace component from titanium alloy (Ti6Al4V) for additive manufacturing
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In evaluating emerging technology, such as additive manufacturing, it is important to analyse the impact of the manufacturing process on efficiency in an objective and quantifiable manner. This study deals with the design ... -
Determination of fan design parameters for light-sport aircraft
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper is focused on the preliminary design of an electric fan for light-sport aircraft. Usage of electric motors brings some advantages compared to piston engines, especially small size and the independence of power ... -
Determination of loads on the body of a boxcar with elastic elements in the center sill
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The authors suggest elastic elements in the body of a centre sill being the basic carrying element of the frame to decrease the dynamic loads. This solution can transform the dynamic loads on the body into the work of the ... -
Disinfection performance of an ultraviolet lamp: a CFD investigation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Ultraviolet (UV)-based devices have shown their effectiveness on various germicidal purposes. To serve their design optimisation, the disinfection effectiveness of a vertically cylindrical UV lamp, whose wattage ranges ... -
Effect of membrane separation process conditions on the recovery of syngas components
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The presented study focuses on inspecting the dependency between process conditions, especially permeate and retentate pressure and component recovery of H2, CO, and CO2 during a membrane separation of model syngas. ... -
Effect of pigments on bond strength between coloured concrete and steel reinforcement
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effect of pigments on mechanical properties of coloured concrete intended for structural applications, including the bond stress-slip behaviour to embedded steel bars, is not well understood. Series of concrete mixtures ...