Acta Polytechnica. 2023, vol. 63: Poslední příspěvky
Zobrazují se záznamy 21-40 z 42
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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 ... -
Utilising Pareto efficiency and RSM to adjust binder content in clay stabilisation for Yttre Ringvägen, Malmö
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In this paper, we present a new framework for improving soil strength using an advanced method of engineering statistics. The materials included clay till collected in Yttre Ringvägen, southern Sweden. Binders included ... -
Exact solutions for time-dependent complex symmetric potential well
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Using the pseudo-invariant operator method, we investigate the model of a particle with a time-dependent mass in a complex time-dependent symmetric potential well V (x, t) = if (t) |x|. The problem is exactly solvable and ... -
Derivation of entropy production in a fluid flow in a general curvilinear coordinate system
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The paper deals with the derivation of the entropy production in the fluid flow performed in a general curvilinear coordinate system. The derivation of the entropy production is based on the thermodynamics laws as well as ... -
Estimation of stresses in a massive granite using laser ultra-sonic testing and stress memory effect
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper addresses in-situ stress-estimation methods based on the Kaiser effect. The physical and mechanical properties of granite, diorite, and granodiorite samples selected at different depth intervals of the core ... -
Femtosecond laser processing of advanced technical materials
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Ultra-short pulsed laser ablation may be used for high-precision machining with very low thermal influence on the processed materials. Due to this reason, lasers are increasingly used for processing of advanced materials, ... -
Self-interference cancellation in underwater acoustic communications systems using orthogonal pilots in IBFD
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper proposes a Self-interference (SI) cancellation system model of Underwater acoustic (UWA) communication for in-band full-duplex (IBFD) technology. The SI channel is separated from the Far channel by exploiting a ... -
Heat transfer characteristics of double pipe heat exchanger having externally enhanced inner pipe
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)An investigation on enhancement of heat transfer is carried out for a double pipe heat exchanger in which the outer wall of the inner pipe is provided with circumferential labyrinth passages. Rectangular and triangular ... -
Induction motor mechanical defect diagnosis using DWT under different loading levels
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The information extraction capability of the widely used signal processing tool, FFT for diagnosing induction machines, is commonly used at a constant load or at different levels. The loading level is a major influencing ...