Acta Polytechnica: Poslední příspěvky
Zobrazují se záznamy 21-40 z 880
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Application of the Source-Jerk method using a neutron generator in a subcritical reactor
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper describes the application of the Source-Jerk method using a neutron generator in the VR-1 reactor. The experiments were carried out on a shutdown reactor with subcriticality greater than -10 βeff. A D-D neutron ... -
The effect of ambient temperature on the delay time of perimeter protection
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Perimeter security defines the private space from the public space and also serves as the first barrier between the intruder and the protected interest. Delay time is one of the input parameters used in a quantitative ... -
PAPR reduction in CP-OFDM (5G) using hybrid technique
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) is a 5G multicarrier waveform that offers great data speeds and improvements in spectrum utilisation. The primary CP-OFDM’s weakness is its excessive ... -
Neural network based patient recovery estimation of a PAM-based rehabilitation robot
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Rehabilitation robots have shown a promise in aiding patient recovery by supporting them in repetitive, systematic training sessions. A critical factor in the success of such training is the patient’s recovery progress, ... -
Improving the energy efficiency of a tram’s running gear
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This research analyses the influence of some design features of an undercarriage of a tram on the energy efficiency in terms of mechanical energy losses during its operation. The work includes the comparison of results of ... -
The effects of potassium permanganate on the geotechnical properties of soils
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In Nigeria, potassium permanganate (KMnO4) is used as a chemical oxidant in the removal of hydrocarbons from polluted soils and groundwater, but there is no information on the effects of KMnO4 on the geotechnical properties ... -
From positional representation of numbers to positional representation of vectors
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)To represent real m-dimensional vectors, a positional vector system given by a non-singular matrix M ∈ ℤm×m and a digit set Ɗ ⊂ ℤm is used. If m = 1, the system coincides with the well known numeration system used to ... -
Qualitative sign stability of linear time invariant descriptor systems
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This article discusses assessing the instability of a continuous linear homogeneous timeinvariant descriptor system. Some necessary conditions and sufficient conditions are derived to establish the stability of a matrix ... -
Fractional multi-loop active disturbance rejection control for a lower knee exoskeleton system
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Rehabilitation Exoskeleton is becoming more and more important in physiotherapists’ routine work. To improve the treatment performance, such as reducing the recovery period and/or monitoring and reacting to unpredictable ... -
Shock wave configuration in a transonic flow through a mid-section of a last stage turbine blade cascade equipped with a part-span connector
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper deals with the study of a flow field and namely the configuration of shock waves in a blade cascade equipped with a part-span connector called tie-boss. The cascade consists of prismatic blades formed from the ... -
Compression behaviour and failure mechanisms of a safety culvert made of hollow high-performance concrete blocks
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The safety culvert composed of hollow high-performance concrete blocks is designed to reduce the risk of injury in the event of a collision. This work presents a new design with an opening for water flow, tests it, identifies ... -
Effect of cross-sections data on calculated static neutronic parameters of PWR MOX/UO2 core transient benchmark case using NODAL3 code
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper describes the effect of cross-section data generated by several codes on calculated neutronic parameters. The Pressurized Water Reactor Mixed Oxide and Uranium Oxide (PWR MOX/UO2) Core Transient Benchmark case ... -
A comparative experimental investigation of high-temperature effect on fibre concrete and high strength concrete using UT and CM methods
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In this paper, a 28-day compressive strength test has been performed on samples including normal fibre concrete and high-strength concrete. The ultrasonic test (UT) as a non-destructive and compression machine (CM) as a ... -
3D CFD model for the analysis of the flow field through a horizontal axis wind turbine (HAWT)
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)With the world’s growing demand for energy, renewable energy production has become important in providing alternative sources of energy and in reducing the greenhouse effect. This study investigates the aerodynamics and ... -
Mechanical and physical properties of cement mixtures for 3D processing
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In this paper, information about cementitious composite materials for further 3D processing is discussed and supplemented. Many of the research in this area focuses primarily on cement composites suitable for 3D printing. ... -
Construction of angular-dependent potentials from trigonometric Pöschl-Teller systems within the Dunkl formalism
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)We generate solvable cases of the two angular equations resulting from variable separation in the three-dimensional Dunkl-Schrödinger equation expressed in spherical coordinates. It is shown that the Dunkl formalism ... -
Parametric optimisation of friction stir welding on aluminium alloy (EN AW-1100) plates
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Friction stir welding is a solid-state welding process used extensively for aluminium alloys. EN AW-1100 alloy is mostly used for its exceptional corrosion resistance, high ductility, high thermal and electrical conductivities, ... -
Multidimensional mobile mapping and integrated approach for the digitalisation of underground transport infrastructure
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The tunnel industry has started focusing on the maintenance and management challenges of an existing infrastructure. It is an urgent matter in industrialised countries, where the stakeholders’ attention is increasing at a ... -
Case study: Dosimetric comparison of VMAT, IMRT and 3DCRT techniques for left-sided breast cancer treated in deep inspiration breath-hold
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The aim of this case study was to compare 3D conformal radiotherapy (3DCRT) plans for patients treated for left-sided breast cancer (whole breast without positive lymph nodes in deep inspiration breath-hold (DIBH)) to ... -
Remapping and simulation of EFI system for SI engine using piggyback ECU
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Electronic fuel injection (EFI) is a complex system, many parts are connected together from mechanical parts to electronic parts to control the internal combustion engine. It must ensure many different works and the most ...