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Project of Road II/317 Bypass of Běstovice - Object No. 124
DÚSP II/317 Běstovice, obchvat - SO 124
(Czech Technical University in Prague, 2026-08-04) Kříž, Václav; Padělek, Tomáš; Kolcun, Juraj
The subject of the bachelor thesis "DÚSP II/317 Běstovice - obchvat" is to elaborate a detailed structural and technical design of a single-lane roundabout including adjacent branches in the municipality of Běstovice and, on the basis of a traffic engineering analysis, to perform a capacity assessment of this junction, which will verify its functionality for the safe and smooth diversion of future transit traffic outside the built-up area of the municipality.
Formulation of non-equilibrium relativistic models on different scales and their stability
Formulace nerovnovážných relativistických modelů na různých škálách a jejich stabilita
(Czech Technical University in Prague, 2026-08-03) Mařík, Kristián Marián; Klika, Václav; Pavelka, Michal
This bachelor thesis investigates mathematical structures for the description and stability analysis of complex nonequilibrium systems. The main objective is to study theoretical methods for the formulation of thermodynamically consistent models and their application to nonlinear dynamical systems. The theoretical part focuses on stability theory for ordinary and partial differential equations, the GENERIC (General Equation for Non-Equilibrium Reversible-Irreversible Coupling) framework, and the mathematical formulation of relativistic hydrodynamics. Particular attention is devoted to the stability analysis of thermodynamically consistent relativistic models with relaxation mechanisms and additional structural variables. The practical part develops and analyses a nonlinear glucoseinsulin regulatory model. The analysis includes the determination of equilibrium states, linearization of the system, derivation of the Jacobian matrix, and investigation of local stability using the RouthHurwitz criterion and qualitative methods. The thesis demonstrates the importance of combining mathematical analysis, physical interpretation, and thermodynamically consistent modelling, providing a foundation for further research in nonequilibrium physics, plasma modelling, and controlled thermonuclear fusion.
Criticality Safety Assessment of Secondary Criticality in a Molten Nuclear Reactor Core
Analýza rizika sekundární kritičnosti roztavené aktivní zóny jaderného reaktoru
(Czech Technical University in Prague, 2026-08-03) Kreutziger, Tomáš; Nývlt, Sebastian; Vácha, Petr; Frýbortová, Lenka
This bachelor thesis investigates the risk of secondary criticality of corium during severe accidents in pressurized water reactors. The effect of fuel fragmentation on system reactivity was modeled in the Monte Carlo code Serpent 2 using stochastic Voronoi tessellations. The results show that the multiplication factor initially increases with fragmentation due to improved moderation and reduced spatial self-shielding, while never exceeding the value of the intact assembly. With further fragmentation it decreases and converges to the limit of a fully homogeneous mixture. Data analysis confirmed that geometric variance dominates the total uncertainty in coarse geometries with a low number of seed points. The key conclusion of the thesis is that using the intact fuel assembly model as a bounding calculation for fragmented fuel is highly conservative. The probability of a random fragmented geometry exceeding the reactivity of the intact lattice was determined to be negligible.
Impact of Electronic vs. Paper-Based Approach Charts on Pilot Performance
Vliv elektronických a papírových map přístrojového přiblížení na výkon pilotů
(Czech Technical University in Prague) Shelestov, Oleksandr; Hanáková, Lenka; Socha, Vladimír; Mach, Ondřej
The increasing use of Electronic Flight Bags (EFBs) has changed the way pilots access and use aeronautical information, including instrument approach charts. Although electronic charts offer several practical advantages over traditional paper-based charts, their influence on pilot performance remains an important human factors consideration. An experimental study was conducted with 20 participants who were undergoing or had completed Instrument Rating training. Each participant performed three simulated Instrument Landing System approaches using an electronic chart, a paper-based A4 chart, and a paper-based A5 chart. Performance was assessed through information retrieval time, accuracy and efficiency, avionics configuration time, compliance with Operational Performance Criteria during the approach and missed approach phases, and qualitative observations of operational errors. The results showed no statistically significant differences among the electronic, A4, and A5 chart formats in information retrieval time, accuracy, efficiency, avionics configuration time, or approach-phase compliance. During the missed approach phase, lower compliance was observed when the A5 chart was used. However, this result was likely influenced by the characteristics and execution of the associated RWY~26R missed approach procedure and therefore could not be attributed solely to the A5 chart format. The findings suggest that, under the conditions of the present study, approach chart format did not appear to have a substantial effect on most measures of pilot performance. Although electronic charts represent an efficient tool in modern aviation, the ability to correctly select, interpret, and apply information from an instrument approach chart remains important regardless of whether the chart is presented in electronic or paper-based form.
Assessment of the Market Potential for the COMAC C919 in China
Tržní potenciál pro letoun COMAC C919 v Číně
(Czech Technical University in Prague) Nguyen, Minh; Vittek, Peter; Olexa, Peter; Kaščeev, Artem
This thesis examines the market potential of the COMAC C919 aircraft in the Chinese narrow-body commercial aircraft market. The aim was to assess its market potential with regard to the current position of Airbus, Boeing and COMAC, as well as possible scenarios for the future development of the market. For this purpose, a quantitative model was developed to estimate the future size of the active fleet and the required number of new aircraft deliveries based on the predicted development of available seat capacity. The estimated delivery requirements were subsequently compared with two scenarios for future Airbus and Boeing deliveries and with two production scenarios for the C919. The baseline scenario did not identify an additional market gap over the long term. Therefore, the C919 would have to gain market share from Airbus or Boeing. In the scenario involving limited Boeing deliveries, a market opportunity of up to 138 aircraft per year emerged. The quantitative results were supplemented by a qualitative assessment of political, industrial and technological factors that could influence the future position of COMAC and the C919. The results indicate that the future position and the market adoption of the C919 will depend primarily on the availability of aircraft supplied by foreign manufacturers, achievable production capacity, state support, and the ability to develop its own technological capabilities and operational support infrastructure. and operational support infrastructure.