Prohlížení Acta Polytechnica. 2023, vol. 63 dle názvu
Zobrazují se záznamy 1-20 z 42
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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 ... -
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 ... -
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. ... -
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 ... -
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 ... -
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 ... -
Comparative study of state space averaging and PWM with extra element theorem techniques for complex cascaded DC-DC Buck converter
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Until now, most commonly used state space averaging and PWM techniques have been applied to different converter topologies and their advantages and disadvantages were stated. However, the superiority of an analytical ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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, ... -
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 ... -
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 ... -
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 ...