Prohlížení Acta Polytechnica. 2022, vol. 62 dle názvu
Zobrazují se záznamy 13-32 z 66
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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 ... -
Evaluation of residual strength of polymeric yarns subjected to previous impact loads
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The discovery of oil fields in deep and ultra-deep waters provided an opportunity to evaluate the use of synthetic ropes, complementarily or alternatively to traditional steel-based mooring lines in offshore units, mainly ... -
Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper focuses on the laboratory experiments of low-temperature adsorption of CO2 at elevated pressure and on the validation of our mathematical model with the data obtained. The numerical approach uses fitting of ... -
Experimental study of the torsional effect for yarn break load test of polymeric multifilaments
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Polymeric multifilaments have gained a significant interest in recent decades. In the studies of mechanical characteristics, although there are different types of tests, such as rupture, abrasion, creep, impact and fatigue, ... -
Experimental verification of the efficiency of selective non-catalytic reduction in a bubbling fluidized bed combustor
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Controlling nitrogen oxide (NOX) emissions is still a challenge as increasingly stringent emission limits are introduced. Strict regulations will lead to the need to introduce secondary measures even for boilers with ... -
Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The results of an experimental research on air staging in a bubbling fluidized bed (BFB) combustor are presented within this paper. Air staging is known as an effective primary measure to reduce NOX formation. However, in ... -
Extra control coefficient additive ECCA-PID for control optimization of electrical and mechanic system
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Proportional Integral Derivative (PID) controllers are frequently used control methods for mechanical and electrical systems. Controller values are chosen either by calculation or by experimentation to obtain a satisfactory ... -
From quartic anharmonic oscillator to double well potential
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Quantum quartic single-well anharmonic oscillator Vao(x) = x2 + g2x4 and double-well anharmonic oscillator Vdw(x) = x2(1−gx)2 are essentially one-parametric, they depend on a combination (g2ℏ). Hence, these problems are ...