Acta Polytechnica. 2023, vol. 63
Kolekce v této komunitě
Poslední příspěvky
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Influence of carbonation on torrent air permeability of concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Air permeability testing is increasingly being used to measure the impermeability of concrete and to estimate the durability of reinforced concrete structures using this property. This paper presents the results of a ... -
Assessment of structures repeatedly exposed to thermal loading and extinguishing water: a case study of a firefighting training facility
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)When designing a new structure or assessing an existing one, the risk of fire and its effect on the structure must be considered. Structures are usually assessed for fire resistance at the design stage – i.e. before the ... -
Semi-analytical approach-based studies of the squeeze film lubrication between rough porous annular discs: Rabinowitsch fluid model
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In recent years, there has been much interest in the effects of porosity and surface roughness (SR) or geometric irregularities between two moving plates under hydrodynamic lubrication. Porous bearings are used extensively ... -
Monitoring the internal structure behaviour of alkali-activated slag paste: effect of the curing mode
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper deals with the monitoring of the internal structure behaviour of an alkaliactivated slag (AAS) paste. The slag was activated with a 4M solution of sodium hydroxide. The behaviour of the internal structure of the ... -
Prediction of temperature field distribution in a gas turbine using a higher order neural network
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper presents the prediction of temperature field distribution in a single annular section using an artificial neural network (ANN). This temperature distribution is non-uniform on the outer tube due to continuous ... -
Experimental investigation of flow characteristics and performance parameters of a podded aft engine air intake
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This experimental study investigates the flow characteristics and performance parameters of a podded intake in aft-engine configuration at the aerodynamic interface plane (AIP), which is a typical configuration of a generic ... -
Enhancement of power transfer capacity of transmission network using multilevel multifunction inverter
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This article presents a multilevel multifunction inverter (MLMFI) with a novel controller for the grid-connection of a solar array. The aim of this work is to improve the technology of the power transfer capacity of existing ... -
Application of an artificial intelligence segmentation for deep hyperthermia treatment planning in the pelvic region
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)During a microwave hyperthermia oncology treatment, the target region temperature is elevated to the temperatures of 40–44 °C, which improves the therapeutic effect of a standard radiotherapy and/or chemotherapy treatments. ... -
Stator current signal crossing for fault diagnosis of self-excited induction generators
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper presents a novel method for modelling and diagnosis of electrical and mechanical faults in fixed-Speed Self-Excited Induction Generators (SEIGs) operating in autonomous mode in a small-scale wind energy system. ... -
Fake face detection based on a multi discriminator deep CNN architecture (MDD-CNN)
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Due to the robustness of the deep learning tools used to design these applications, fakes are becoming increasingly common as these applications become more widely available and accessible to the general public. These fakes ... -
Geometric approach to solving inverse kinematics of six DOF robot with spherical joints
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Inverse kinematics is a fundamental concept in robotics that plays a crucial role in a robot’s ability to perform tasks. In this contribution, we propose a novel geometric approach based on vector calculus to solve the ... -
Improving QoS in mobile multimedia streaming with SCTP-PQ
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The Stream Control Transmission Protocol (SCTP) is often the preferred transport layer protocol in streaming applications. This protocol combines the best aspects of Transmission Control Protocol (TCP) and User Datagram ... -
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 ...
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