Acta Polytechnica. 2022, vol. 62: Poslední příspěvky
Zobrazují se záznamy 21-40 z 66
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
A mindlin shell finite element for stone masonry bridges with backfill
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Stone masonry bridges are difficult to analyse with commercial finite element (FE) packages for their specific heterogeneous composition. The stone arch is best modelled as a thick shell where there are predestined directions ... -
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 ... -
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 ... -
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 ... -
Theoretical and experimental study of water vapour condensation with high content of non-condensable gas in a vertical tube
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This article deals with the possibility of separating water vapour from flue gases after oxyfuel combustion using condensation processes. Those processes can generally be described as condensation of water vapour in the ... -
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 ... -
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 ... -
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 ... -
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, ... -
The engineering performance of eco-friendly concretes containing diatomite fly ash and ground granulated blast furnace slag
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Approximately 10 % of CO2 is emitted from an ordinary Portland cement production. In cement and concrete production, CO2 emissions can be greatly reduced by using Supplementary Cementitious Materials (SCMs). In addition, ...