Browsing Acta Polytechnica. 2022, vol. 62 by Issue Date
Now showing items 21-40 of 66
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Quantum description of angles in the plane
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The real plane with its set of orientations or angles in [0, π) is the simplest non trivial example of a (projective) Hilbert space and provides nice illustrations of quantum formalism. We present some of them, namely ... -
Analytic and Algebraic Methods in Physics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022) -
A comparative study of ferrofluid lubrication on double-layer porous squeeze curved annular plates with slip velocity
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article makes an effort to present a comparative study on the performance of a Shliomis model-based ferrofluid (FF) lubrication of a porous squeeze film in curved annular plates taking slip velocity into account. The ... -
Performance of a hydromagnetic squeeze film on a rough circular step bearing: a comparision of different porous structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This investigation deals with a comparative analysis of the impact of spongy structure based on the model of Kozeny-Carman and Irmay on a hydromagnetic squeeze film in a rough circular step bearing. Christensen and Tonder’s ... -
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. ... -
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 ... -
A model of isotope transport in the unsaturated zone, case study
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This work deals with a groundwater flow and solute transport model in the near-surface (predominantly unsaturated) zone. The model is implemented so that it allows simulations of contamination transport from a source located ... -
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 ... -
Results of research on backlash compensation in a power electric drive by low-power electronic device
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article considers the feasibility of restoring and maintaining the kinematic accuracy of the support-rotary device drives by introducing a backlash compensation device into the control system. The power electromechanical ... -
Functional aerodynamics and its influence on the energy and thermal mode of a naturally ventilated double-skin transparent façade
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article deals with the dynamics of airflow through a cavity. In windless conditions, where a natural flow causes the flow of air in the cavity, the overall aerodynamic resistance of the cavity is the important aerodynamic ... -
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 ... -
Low earth orbit nanosatellite: influence of heat dissipation on passive thermal analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The use of small satellites in ambitious missions presents challenges related to thermal breakdowns as one of the critical issues contributing to their failure. Heat dissipation and thermal management are still the major ... -
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 ... -
Measurement of solid particle emissions from oxy-fuel combustion of biomass in fluidized bed
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The presented work summarizes the results of the measurement of solid particle emissions from an experimental 30 kW combustion unit. This unit has been used for the research of oxy-fuel combustion of biomass in a fluidized ... -
ZnO-Zeolite nanocomposite application for photocatalytic degradation of procion red and its adsorption isotherm
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this paper, the photocatalytic degradation of procion red dye, one of the most frequently used dyes in the textile industry, was studied. The objective of the research is to study the ZnO-Zeolite nanocomposite application ... -
Reduction of pavement thickness using a subgrade layer treated by different techniques
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A range of stabilisers for poor quality subgrade soils have been developed to promote road constructions. Many of them are becoming more popular depending on their effectiveness. The purpose behind this research is to ... -
Performance assessment of steel truss railway bridge with curved track
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Non-destructive Structural Health Monitoring techniques can be incorporated into bridge integrity management by assessing structural conditions. This paper describes a performance assessment of a steel truss railway bridge ... -
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 ... -
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 ...