Browsing Acta Polytechnica. 2022, vol. 62 by Title
Now showing items 24-43 of 66
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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 ... -
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 ... -
Generalized three-body harmonic oscillator system: ground state
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this work we report on a 3-body system in a d−dimensional space ℝd with a quadratic harmonic potential in the relative distances rij = |ri −rj| between particles. Our study considers unequal masses, different spring ... -
How to understand the structure of beta functions in six-derivative Quantum Gravity?
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We extensively motivate the studies of higher-derivative gravities, and in particular we emphasize which new quantum features theories with six derivatives in their definitions possess. Next, we discuss the mathematical ... -
Improvement of spectrum sensing performance in cognitive radio using modified hybrid sensing method
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Cognitive radio (CR) is a wireless technology for increasing the bandwidth usage. Spectrum sensing (SS) is the first step in CR. There are three basic techniques in SS, energy detection (ED), matched filter (MF), and ... -
Linearised coherent states for non-rational SUSY extensions of the harmonic oscillator
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this work, we derive two equivalent non-rational extensions of the quantum harmonic oscillator using two different supersymmetric transformations. For these extensions, we built ladder operators as the product of the ... -
Load carrying capacity of masonry arch railway bridges at the serviceability limit state
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article focuses on masonry arch railway bridges. The main topic is the algorithm, which was developed for the purpose of a non-linear arch bridge analysis. The sensitivity analysis of the input parameters of the ... -
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 ... -
Maxwell-Chern-Simons-Higgs theory
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We consider the three dimensional electrodynamics described by a complex scalar field coupled with the U(1) gauge field in the presence of a Maxwell term, a Chern-Simons term and the Higgs potential. The Chern-Simons term ... -
Measurement of a quantum particle position at two distant locations: a model
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A simplified one-dimensional model of measurement of the position of a quantum particle by two distant detectors is considered. Detectors are modelled by quantum particles bounded in potential wells with just two bound ... -
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 ... -
Modified Korteweg-de Vries equation as a system with benign ghosts
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We consider the modified Korteweg-de Vries equation, uxxx + 6u2ux + ut = 0, and explore its dynamics in spatial direction. Higher x derivatives bring about the ghosts. We argue that these ghosts are benign, i.e., the ...