2026-02-22
00:17 |
Tailoring the physical properties of 2D materials
Sampathkumar, Krishna ; Bhatt, Keyur D. (oponent) ; Gokuldoss, Prashanth Konda (oponent) ; Neužil, Pavel (vedoucí práce)
Tuning the material properties leads to new findings in fundamental science and paves the way to making the materials ready for applications. Graphene and other emerging 2D material classes offer a variety of new physical and chemical properties. Further tuning properties of these materials will improve the intrinsic properties and also help to elucidate the new physico-chemical phenomena. Many methods exist to tune the 2D materials properties; strain engineering belongs to the most promising ones due to 2D materials unique mechanical properties and their sensitive nature to even the smallest perturbations. Therefore, the focus of this thesis is on adopting the strain engineering techniques to tune the properties of the 2D materials. Furthermore, this thesis tries to address the development of the 2D material sample preparation techniques, related applications, and the effect of biaxial strain to tailor their electronic structures, phonon scattering, excitation dynamics such as exciton funneling and others.
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2026-02-22
00:17 |
Úplný záznam
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2026-02-22
00:17 |
Research and development of a production technology and surface treatments with planned use in ultra high vacuum and high vacuum applications
Papula, Martin ; Thirumalaikumarasamy, Duraisamy (oponent) ; Ctibor, Pavel (oponent) ; Čelko, Ladislav (vedoucí práce)
Vacuum technologies and their applications have undergone rapid increases in many fields, especially in high-tech manufacturing and research sectors like high-energy particle physics, lasers, aerospace, semiconductors, and nanotechnologies over the last few years. There are many proven applications, materials, and devices using vacuum and many more applications with future upgrade potential if used in a controlled, vacuum environment. Today’s trend is to put many different materials and complex devices into one vacuum system – for example, whole robots, manipulators, electronics, 3D printing systems and satellites. All surfaces and bulk materials need unique properties if used in high (HV) or ultra-high vacuum (UHV) and must be treated accordingly. This work is focused on production technology for surface treatments, and its use in the modification of materials and devices with potential uses in high and ultra-high vacuum environments. It investigates the development of novel surface treatments for HV and UHV applications. The primary objective of this work was to develop advanced materials using production technology centered on thermal plasma spraying. At the heart of the research lies an in-depth investigation into the understanding and optimization of plasma gun parameters and their influence on quality of coatings. The experimental phase also involved the assembly of a thermal spraying system, the design and assembly of the modular vacuum chamber, selection of suitable material compositions, alongside with the preparation and testing of areal heating samples within a vacuum environment. The results demonstrate the effectiveness of the coating system, and the robustness of developed multilayered material systems based on TiO2, showcasing their high performance and potential for various applications in HV and UHV, including their suitability in advanced coating processes, demonstrated by MW-PECVD for nano-diamond growth. The developed areal heating coatings represent a unique and innovative material system for heating in high vacuum environments.
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2026-02-22
00:17 |
Predictive Control Strategy of a Hybrid Electric Vehicle for a Regular Commuting Regime
Ušiak, Michal ; Malý, Miroslav (oponent) ; Danko, Ján (oponent) ; Štětina, Josef (vedoucí práce)
Due to increasingly strict emissions legislation, car manufacturers are forced to reduce the production of vehicle exhaust emissions. Today, the most debated topic is greenhouse gas emissions, which, when using fossil fuels, can only be reduced by cutting down on fuel consumption. For hybrid vehicles, this goal can be achieved by making the control logic more efficient. This thesis developed a control strategy for hybrid vehicles based on the principle of a finite-state machine, using a local optimization method. The goal was to improve the efficiency of the hybrid vehicle's control logic by predicting the driving profile of a regular commute based on previously completed trips along the same route. To ensure the predictive control strategy is activated only at the appropriate time, an algorithm to identify repeating driving patterns was created. By subsequently adapting the existing control logic based on the predicted driving profile, it's possible to reduce fuel consumption and, consequently, lower CO2 emissions. To verify the control strategy, validation drives were conducted on a predetermined circuit. These drives showed that for a mild-hybrid vehicle, the control strategy leads to a reduction in fuel consumption and CO2 emissions of approximately 2.3 %. For full-hybrid vehicles, a significantly higher savings is expected due to a greater degree of regenerative braking, which further increases the potential of the proposed solution.
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2026-02-22
00:17 |
Antimicrobial non-adhesive hydrogels based on Sterculia urens natural gum for moist wound healing
Drápalová, Eva ; Lehocký, Marián (oponent) ; Studenovská, Hana (oponent) ; Vojtová, Lucy (vedoucí práce)
The presented doctoral thesis is focused on the preparation and characterization of novel hydrogels based on natural polysaccharides for soft tissue regeneration. The aim of the thesis was to develop a new generation of natural polymeric materials with important beneficial properties such as antimicrobial effects, renewability, easier preparation process, and enhanced biological activity. The theoretical part summarizes the state of the art of wound healing materials, such as hydrogels, their types (synthetic or natural), and the advantages or disadvantages pointed to the regenerative medicine application. The information about the natural polysaccharide gum karaya (chemical structure, solubility, heat, pH stability, etc.), its modification, mixtures and chemical crosslinking is also presented. The experimental part is focused on the preparation and chemical modification of hydrogels based on chitosan and gum karaya natural polysaccharides. Prepared samples were characterized chemically (by Fourier-transformed infrared spectroscopy) and physically (by rheology, measurement of swelling behaviour in different solvents, calculation of diffusion mechanism, and hydrolytic stability). Antimicrobial activity and cytotoxicity were evaluated using two different in vitro cell models - adherent fibroblasts (NIH3T3) and non-adherent suspension of B-lymphocytes (BaF3), both of which showed increased cell viability than negative control 72 hours after treatment. Based on the presented results, the prepared polymer blends exhibit unique properties that can be tailored for specific applications in regenerative medicine and thus meet the requirements of modern wound dressings.
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2026-02-15
00:17 |
Generativní tektonika robotické tvorby
Králík, Martin ; Horáková, Jana (oponent) ; Křenek, Ladislav (oponent) ; Medek, Tomáš (vedoucí práce)
Tato práce je zaměřena na vztah umělce a robotických technologií během společné práce. Nikoli jen ve smyslu, jak se stroji pracovat, ale co lze s jejich pomocí vytvořit, jak se můžou stát velice sofistikovaným nástrojem výtvarníka, a jak současně zachovat tvůrčí roli člověka v procesu tvorby. Práce se zabývá průzkumem kreativity a dosažitelných limitů robotické tvorby, jakým způsobem se tyto limity mohou posunout použitím pokročilých softwarových nástrojů generativní tvorby a jak výpočetní technika ovlivňuje tvorbu autora ve stále se zrychlující době, kde se mnohdy volí snazší cesta a všeobecně se zapomíná na hodnotu řemeslných dovedností. Práce se odklání od širšího kontextu digitálního sochařství a zaměřuje se na robotickou tvorbu jako specifický nástroj s jedinečnými vlastnostmi, přičemž propojuje použití generativního algoritmického softwaru s fyzickým zpracováním pomocí strojů, zejména prostřednictvím standardního a robotického 3D tisku. Práce je tedy o transformaci procesů, ale také myšlení, které stojí za vznikem nových forem a metod.
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2026-02-15
00:17 |
"Future of Work"
Zarevska, Dragana ; Artamonov, Vasil (oponent) ; Hrončeková, Ivana (oponent) ; Cenek, Filip (vedoucí práce)
The doctoral thesis examines selected perspectives and perspective shifts of labor, value, and artistic work. Through an interdisciplinary practice that combines speculative elements in the individual and collaborative projects of the author, as well as examples of artistic work by a few other artists, it questions how emergent technologies like AI challenge our understanding and the nature of artistic labor of today. And amidst the incursions of AI, automation, and late-capitalist precarity, it tends to bring a few aspects of artistic work as a job and a meaning-maker to its front focus. The complementary artistic projects included in the doctoral thesis operationalize speculative frameworks to display an expanded poetics of work, where the artist is being situated as a critical agent in post-anthroposcenic and post-work paradigms.
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2026-02-15
00:17 |
Dielectric properties of composite epoxy-based structures
Alsoud, Ammar Awadallah Ahmad ; Maletić, Slavica (oponent) ; Al-Tarawneh, Moaz M. (oponent) ; Sobola, Dinara (vedoucí práce)
This doctoral study investigates epoxy resin nanocomposites for advanced electrical applications. Although epoxy resins offer exceptional insulation and adhesion properties, their electrical characteristics require enhancement through nanoparticle incorporation. The study comprises two main parts: a comprehensive theoretical review of the dielectric prop erties of composites, and an experimental investigation of epoxy nanocomposites. The experimental work focused on optimizing the dielectric properties of ceramic oxides, such as iron oxide (Fe2O3) and yttrium oxide (Y2O3), for high-voltage insulation. In addition, the investi gation extended to other oxides including silica (SiO2), alumina (Al2O3), and magnesium oxide (MgO).Moreover, Developing epoxy/ Graphite flakes (GFs) composites for energy storage applications, and exploring epoxy-coated tungsten tips for field electron emission via the dot capacitor model. Key challenges, including filler dispersion and structural integrity, were also addressed. The materials were characterized over a broad frequency range (102 to 106 Hz) and a temperature range (30–170,°C), with high field breakdown analysis. This study provides customized strategies for epoxy composites in energy storage, high-voltage systems, and emission technologies. This thesis advances epoxy nanocomposites for next-generation electrical applications. Ceramic oxide integration significantly enhances the dielectric performance of high-voltage systems, while epoxy/GFs composite demonstrate viable energy storage solutions. The dot-capacitor model successfully explains the emission behavior of epoxy-coated emitters. Together, these findings establish design protocols for epoxy-based materials that meet critical industrial demands in energy and electronics.
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2026-02-15
00:17 |
Material evaluation and characterisation by X-ray computed tomography
Lázňovský, Jakub ; Pína, Ladislav (oponent) ; Adameyko, Igor (oponent) ; Kaiser, Jozef (vedoucí práce)
X-ray Computed Tomography (CT) is an effective non-destructive technique for three-dimensional characterisation of materials with micro- and sub-micro scale resolution. This thesis focuses on the development of quantitative CT characterisation methods and their application in two areas: biological tissue analysis and characterisation of materials for additive manufacturing. In biological applications, the use of CT is demonstrated for estimating bone mineral density, evaluating intervertebral fusion in ex vivo porcine samples, automated morphometric analysis of mouse skulls, and mapping the development of the model animal Xenopus laevis. In the field of additive manufacturing, CT is applied in the methodology for determining the spatial resolution of CT scans, evaluating powders as input material for additive manufacturing, and in the multiscale analysis of reference, additively manufactured samples. The jointly demonstrated methodologies enhance the use of CT from a visualisation technique to a robust tool for non-destructive testing, providing reproducible approaches that find application in both scientific research and industrial practice.
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2026-02-07
00:35 |
Modernizace budovy bývalého lihovaru
Floriánová, Eva ; Berková, Petra (oponent) ; Sobotka, Jindřich (vedoucí práce)
Diplomová práce řeší projekt modernizace budovy bývalého lihovaru na okraji zastavěné části obce Klučov. Stávající budova je postavena do obráceného písmene U a skládá se celkem z pěti budov na sebe navazujících, avšak dispozičně nepropojených. Objekt je řešen jako stěnový konstrukční systém založený na základových pasech. Všechny budovy jsou jednopodlažní zastřešené sedlovými střechami. Uliční budova je zastropena valenou klenbou a jako jediná obsahuje konstrukci stropu. Dispozičně je zde nově navržená ubytovací část, restaurace s kuchyní a společenským sálem a prostor pro administrativu. Novým venkovním schodištěm je zpřístupněn, dosud nevyužitý, prostor ve druhém nadzemním podlaží.
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