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Item type:Item, Access status: Open Access , Cyklická plasticita materiálů vyrobených technologií SLM(Vysoké učení technické v Brně. Fakulta strojního inženýrství) Nopová, Klára; Pantělejev, Libor; Fintová, Stanislava; Nový, FrantišekPředložené práce je zaměřena na zpracování Mg slitiny AZ91D technologií SLM. Postupným testováním a optimalizací jednotlivých procesních parametrů bylo dosaženo relativní hustoty materiálu >99 %, a to beze změny v chemickém složení slitiny. Díky velmi nízké porozitě a jemnozrnné mikrostruktuře materiálu dosáhla slitina poměrně vysokých mechanických charakteristik, Rm = 305 MPa, Rp0,2 = 181 MPa a A5,65 = 5,2 %. V oblasti cyklického zatěžování vykázala slitina po SLM procesu cyklickou stabilitu, přičemž v prvních několika cyklech bylo pozorováno cyklické změkčení v důsledku relaxace napětí a s následným cyklickým zpevnění v důsledku tvorby a kumulace dislokací. Na základě dat z vysokocyklové oblasti byla určena mez únavy (102,5 MPa), která úspěšně konkuruje extrudovaným Mg slitinám stejné třídy. Na základě fraktografické analýzy byla určena místa iniciace trhlin, a to ve všech případech v oblasti s pórem v blízkosti povrchu.Item type:Item, Access status: Open Access , Structural, electronic, and chemical manifestations of weak molecule-substrate coupling on Bi2Se3 compared with Ag, Au, and graphene(Elsevier, 2026-03-01) Čechal, Jan; Stará, Veronika; Kurowská, Anna; Blatnik, Matthias; Pravec, Daniel; Hrubá, Daniela; Kunc, Jan; Drasar, Cestmir; Planer, Jakub; Procházka, PavelModifying topological insulator (TI) surfaces with metal-organic layers offers a pathway to a material that displays the quantum anomalous Hall effect. However, knowledge of the molecular nanoarchitectonics on weakly interacting TI surfaces remains limited, which hinders the experimental realization of organic layers with the required properties. Here, we combine low-energy electron microscopy and diffraction, STM, XPS, and DFT calculations to investigate the adsorption of 4,4'-biphenyl-dicarboxylic acid (BDA) on the Bi2Se3(0001) and compare it with Ag(100), Ag(111), Au(111), and graphene substrates. We identify four manifestations of weak molecule-substrate coupling: (i) Upon deposition, the BDA molecule stays intact and is physisorbed. (ii) The intact nature of BDA is preserved at elevated temperatures. (iii) The electronic energy levels of BDA are decoupled from substrate polarization effects. (iv) There is a weak positional preference of the BDA molecular phase with respect to the substrate. Bi2Se3 exhibits uniquely weak structural, electronic, and chemical interactions with BDA, meeting all these points, whereas the other substrates fail to meet one or several of these points. These insights provide a quantitative framework for understanding weak molecule-substrate coupling across a range of 2D materials and metallic surfaces, informing the design of molecular architectures on nonmetallic substrates for quantum and functional nanomaterials with potential applications in quantum nanoelectronics.Item type:Item, Access status: Open Access , Thermal and filler concentration modulation of charge transport mechanism and dielectric properties in high-entropy oxide (CoCrFeNiMn)3O4-acrylic polymer composite(Springer Nature, 2026-02-04) Daradkeh, Samer Issa Abdel Razzaq; Alsoud, Ammar Awadallah Ahmad; Spusta, Tomáš; Pouchlý, Václav; Knápek, Alexandr; Tofel, Pavel; Sobola, DinaraThis study investigates the dielectric properties of polymer composites comprising an acrylic matrix and high-entropy oxide (HEO) (CoCrFeNiMn)3O4 filler. Single-phase HEO was synthesized via solid-state reaction followed by calcination at 850 degrees C (HEO-850). The research systematically examines the temperature- and concentration-dependent evolution of dielectric properties and charge transport mechanisms within these composite systems. Our findings reveal distinct correlations between filler concentration and dielectric performance enhancement. The unique properties of HEOs, stemming from their compositional complexity and structural characteristics, position these composite materials as promising candidates for advanced dielectric applications. The study elucidates fundamental parameters (temperature and filler concentration of HEO-850) governing the electrical behavior of HEO-polymer composites, providing insights into tailoring their properties for different technological applications.Item type:Item, Access status: Open Access , Concrete fatigue propagation from material to structure: Multiscale validation of a thermodynamically based discrete model on prisms and prestressed beams(Elsevier, 2026-04-15) Aguilar, Mario; Vořechovský, Miroslav; Baktheer, Abedulgader; Chudoba, RostislavFatigue assessment of concrete structures relies predominantly on empirical evidence from uniaxial cylinder tests, codified into structural design rules. Several continuum damage-plasticity models have been developed to capture fatigue-induced dissipative mechanisms. However, they do not explicitly resolve how damage propagates through the aggregate skeleton and translates into structural behavior. This study addresses this gap by integrating a thermodynamically based inter-aggregate constitutive law into a lattice discrete particle model that explicitly represents mesoscale concrete heterogeneity. The thermodynamic formulation inherently decomposes dissipated energy into contributions from distinct degradation mechanisms, enabling mechanism-specific fatigue characterization. The model is calibrated using macroscopic characteristics of monotonic and fatigue response of prisms under compression and validated against prestressed beam experiments under variable-amplitude fatigue loading. Simulations reproduce experimental trends of fatigue response in prestressed beams, revealing two key findings: (i) the obtained Sparks-Menzies relation persists across material and structural scales; (ii) damage dissipation emerges as a scale-consistent, load-level-independent indicator of fatigue capacity within a given stress configuration, offering a physically grounded alternative to empirical design criteria. The present high-fidelity model provides the basis for resolving the transition from meso-scale material behavior to macroscopic structural response, and establishes a foundation for future coarse-graining and time-scale acceleration strategies required for large structures and long fatigue lives.Item type:Item, Access status: Open Access , A supervised system for curating browsing whitelists for individuals with cognitive disabilities under legal guardianship(Springer Nature, 2026-03-30) Komosný, Dan; Rehman, Saeed Ur; Shah, Syed Usman Ali; Ayub, Muhammad SohaibEnsuring digital safety for individuals under legal guardianship due to cognitive disabilities is the responsibility of their legally appointed guardians. These guardians are charged with making personal and lifestyle decisions in the best interests of the wards, which include their online access. Traditional blacklists are often ineffective for this purpose, as wards may trust misleading or harmful content across the entire web. Whitelists are a more suitable solution, as they restrict access to a predefined set of trusted websites, thereby reducing exposure to misleading, manipulative, or harmful content. However, creating and maintaining large whitelists is challenging and requires frequent updates, particularly for hyperlocal websites that are most important for a ward's social life and independence. We present SafeWeb, a supervised system designed to assist guardians in curating whitelists. Our method automatically curates relevant hyperlocal websites, which are essential for fostering ward independence but difficult to process with existing approaches. The processed websites are categorized into three groups: facility (e.g., schools and social centers), commerce (e.g., shops and service points), and prohibited (e.g., gambling venues and nightclubs). We provide the SafeWeb source code and curated websites for 20 countries (including USA, France, Japan, and Australia), along with validation results for selected countries. The results demonstrate SafeWeb's effectiveness as a decision-support tool for guardians to act in the ward's best interest.