Tomas Bata University in Zlín
Institutional repository of Tomas Bata University LibraryNot a member yet
10673 research outputs found
Sort by
The fundamental aspects of information support for population protection from the perspective of municipalities with extended powers in the Czech republic
No full textThe contribution introduces the field of information support for the population protection. In particular, it focuses on a definition of a basic structure of an information system for planning and implementation of the population protection in the context of the valid legislation and possible practical application in the territory of the municipality with extended powers
Custom Matlab toolbox for systems with parametric uncertainties and time delay with factorization for two-degree-of-freedom feedback loop
No full textThe Robust Control Toolbox for Time Delay Systems with Parametric Uncertainties for the Matlab system is described in this paper. The D-K iteration and the algebraic approach implemented for general 3rd order system with parametric uncertainties in numerator and denominator of plant transfer function and uncertain time delay with factorization of simple feedback controller to the parts in two-degree-of-freedom feedback interconnection is included in the toolbox. The multiplicative uncertainty treats uncertain time delay, the general interconnection for the systems with parametric uncertainty in numerator and denominator is used for modelling the parametric uncertainty. User-friendly interface empowering full operation is implemented in the toolbox.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: LO1303, MSMT-7778/201
Exploring clustering in SOMA
No full textDuring the developing phase of the new evolutionary algorithm (EA) or the analysis, several techniques or measurements are used to capture the inner dynamic of an algorithm. Besides the usual ones, for example, convergence graphs, population diversity, or complex networks, the scientists may also use clustering. Clustering analysis may naturally be used to analyze the grouping of individuals in swarm-based algorithms. This paper examines the possibilities of the clustering analysis for the Self-Organizing Migrating Algorithm with CLustering-aided migration (SOMA-CL). The algorithm is described in detail, together with several cluster analyses which can be used to investigate the behavior of the algorithm.IGA/CebiaTech/2022/001Internal Grant Agency of Tomas Bata University [IGA/CebiaTech/2022/001]; Faculty of Applied Informatics, Tomas Bata University in Zlin (ailab.fai.utb.cz
Concealed information detection using EEG for lie recognition by ERP P300 in response to visual stimuli: A review
Get PDFNowadays, lie detection based on electroencephalography (EEG) is a popular area of research. Current lie detectors can be controlled voluntarily and have several disadvantages. EEG-based lie detectors have become popular over polygraphs because human intentions cannot control them, are not based on subjective interpretation, and can therefore detect lies better. This paper's main objective was to give an overview of the scientific works on the recognition of concealed information using EEG for lie detection in response to visual stimuli of faces, as there is no existing review in this area. These were selected publications from the Web of Science (WoS) database published over the last five years. It was found that the Event-Related Potential (ERP) P300 is the most often used method for this purpose. The article contains a detailed overview of the methods used in scientific research in EEG-based lie detection using the ERP P300 component in response to known and unknown faces. © 2022 World Scientific and Engineering Academy and Society. All right reserved.Tomas Bata University in Zlin, TBU: IGA/CebiaTech/2022/00
Electrospun sound-absorbing nanofibrous webs from recycled poly(vinyl butyral)
Get PDFThe amount of poly(vinyl butyral) (PVB) foils added to car windscreens to suppress glass shattering represents a huge worldwide volume of the material, and once a vehicle is end-of-life it also becomes a significance contributor to landfill. The recycling of PVB materials from windscreens has been expensive and despite improvements in recycling technologies, the landfill burden still increases. However, an increase in oil prices can shift the economic balance and stimulates the possible applicability of recycled PVB. As PVB is a relatively easy electrospinnable material, it is shown that nanofibrous mats produced from recycled PVB blends in ethanol exhibit very good sound-absorbing properties. To achieve an optimal composition between virgin and recycled PVB blends, a series of their ratios was consecutively characterized using various techniques (rheometry, SEM, FTIR, DSC, TGA, DMA, an impedance tube for determining sound absorbance). The best result was obtained with two wt. portions of 8 wt.% solution of virgin PVB in ethanol and one wt. portion of 12 wt.% solution of recycled PVB in ethanol. © 2022 by the authors.RP/CPS/2022/003; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT; Akademie Věd České Republiky, AV ČR: 67985874Ministry of Education, Youth and Sports of the Czech Republic-DKRVO [RP/CPS/2022/003]; Czech Academy of Sciences, Czech Republic [RVO: 67985874
Selected simple natural antimicrobial terpenoids as additives to control biodegradation of polyhydroxy butyrate
Get PDFIn this experimental research, different types of essential oils (EOs) were blended with polyhydroxybutyrate (PHB) to study the influence of these additives on PHB degradation. The blends were developed by incorporating three terpenoids at two concentrations (1 and 3%). The mineralization rate obtained from CO2 released from each sample was the factor that defined biodegradation. Furthermore, scanning electron microscope (SEM), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA) were used in this research. The biodegradation percentages of PHB blended with 3% of eucalyptol, limonene, and thymol after 226 days were reached 66.4%, 73.3%, and 76.9%, respectively, while the rate for pure PHB was 100% after 198 days, and SEM images proved these results. Mechanical analysis of the samples showed that eucalyptol had the highest resistance level, even before the burial test. The other additives showed excellent mechanical properties although they had less mechanical strength than pure PHB after extrusion. The samples' mechanical properties improved due to their crystallinity and decreased glass transition temperature (Tg). DSC results showed that blending terpenoids caused a reduction in Tg, which is evident in the DMA results, and a negligible reduction in melting point (Tm).Horizon 2020: 862910; Univerzita Tomáše Bati ve Zlíně: IGA/FT/2020/005, IGA/FT/2020/009, IGA/FT/2022/003European Union's Horizon 2020 Research and Innovation Program [862910]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/FT/2020/005, IGA/FT/2020/009, IGA/FT/2022/003
University students' experience with mobile learning during COVID-19 pandemic
No full textThe study focuses on mobile learning at universities, with emphasis on the changes brought by the quarantine during the COVID-19 pandemic (the first and the second wave) in which only distance education was possible. The participant sample consisted of Slovak university students (N = 48; age 20-25 in 2020 and N = 45; age 20-25 in 2021). Qualitative design and narrative method were chosen to find out the individuals' experience of concrete events embedded in a socio-cultural context. The data was analyzed using a holistic-content perspective in combination with a thematic analysis. The results showed the key moments linked to the university students' experience in the first wave of the COVID-19 pandemic: nostalgia, shock - sudden change, and adaptation. In the second wave of the COVID-19 pandemic, the key moments were: nostalgia, uncertainty, and short-term planning. The important phases for the sustainability of m-learning were related to the comparison between nostalgia, the recovery from the shock after a sudden change in lifestyle, and the adaptation to new living conditions. This was reflected in the key topics focused on the main phases, with an accent on life enjoyment, self-centring, and stress before the COVID-19 pandemic. The paper fulfills the gap in the research focused on understanding students' feelings, attitudes, values, and use of m-learning during forced distance education. Qualitative design research allowed going deeper into students" psychological aspects during national quarantine. The results allow us to prepare the universities and state policies on working with students during future crises and emphasize sustainable mobile learning.Tomas Bata University in Zlin [RVO/FM/2020/001, FSR FORD 5-6/2021/-23/FMK/002, VO/FMK/2020/001
The size of government and economic growth in EU countries
No full textThe relationship between the public sector size and economic growth is the subject of many discussions. Momentarily, the four elementary streams are defined, while the resulting impact depends on the monitored sample of the countries and the employed methodology. The aim of the paper was to identify the impact of the public sector size on the economic growth of the 27 EU countries in the period 1996 to 2021. The public sector size was quantified using four different variables as total public expenditure, total public revenue, tax revenue and final government consumption. Through panel regression, the negative impact of the public sector size on the economic growth of the EU countries was demonstrated in all four models, while the most significant negative impact was reached by the final government consumption. The significant negative impact of the crisis presence on the economic growth of the EU countries was also demonstrated. The EU countries should focus their activities there to diminish the public sector growth and to manage the structure of the government expenditures from the current to capital expenditures of an investment characteristic.Univerzita Tomáše Bati ve Zlíně: RO/FaME/2022/0
Atom transfer radical polymerization of 2-isopropenyl-2-oxazoline in solution and from the surface of carbonyl iron particles toward fabrication of a cytocompatible magneto-responsive hybrid filler
No full textAtom transfer radical polymerization (ATRP) of 2-isopropenyl-2-oxazoline was optimized both in solution and initiated from carbonyl iron (CI) particle surface (SI-ATRP) in order to obtain polymers with well-defined molar mass and narrow dispersity. The polymerization procedure was thoroughly investigated by size exclusion chromatography and H-1 NMR and optimized from the point of view type of initiator, ligand, copper catalyst, and solvent. Finally, the poly-(2-isopropenyl-2-oxazoline)(PIPOx) with controlled molar masses up to 20,000 g/mol and dispersity in the range of 1.2-1.5 were successfully prepared, while high conversions could be reached. Polymerization conditions using halogen exchange leading to well-defined PIPOx were also developed and used for SI-ATRP. SI-ATRP was finally applied for synthesis of magnetic CI-PIPOx core-shell particles with two various molar masses of the grafted PIPOx. Finally, as a proof of applicability of such hybrid particles, the particles were dispersed in the phosphate buffer saline and glycerol to obtain the magnetorheological fluid with blood-like characteristics. Magnetorheological and cytotoxicity investigations proved that non-cytotoxic CI-PIPOx core-shell particles provided the system with sufficient yield stress values to act as an embolization agent.Ministry of Education, Youth and Sports of the Czech Republic-DKRVO [RP/CPS/2022/003]; projects VEGA [APVV-19-0338, VEGA 2/0161/20]; ERDF; Qatar University; [VEGA 2/0172/21]; [313021T081]; [QUCG-CAM-22/23504]Ministry of Education, Youth and Sports of the Czech Republic DKRVO [RP/CPS/2022/003]; VEGA [2/0161/20, 313021T081]; Research & Innovation Operational Programme - ERDF [QUCG-CAM-22/23504]; Qatar University [2/0172/21]; [APVV-19-0338]Slovenská Akadémia Vied, SAV, (313021T081); Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT, (APVV-19-0338, VEGA 2/0161/20, VEGA 2/0172/21); Qatar University, QU, (QUCG-CAM-22/23–504); European Regional Development Fund, ERD
Injection molding of polycarbonate thick-walled parts using a tool with variously designed gate inserts
No full textInjection molding is an advantageous technology for the mass production of plastic parts without the necessity for additional procedures. The applicability of this method is still partially limited by the required properties of the manufactured parts. Espe-cially in the field of optics, there is a need to produce thick-walled parts while maintaining their transparency. This paper reports on how various shapes of gating systems affected the process parameters and cavity filling during the injection molding of polycarbonate thick-walled specimens. These outcomes demonstrated that film gates and their alternatives are more suitable for the standard injection molding of thick-walled optical products than the triple-edge gating systems. Favorable results were ob-served particularly in the uniformity of cavity filling, size of shrinkage, and in the occurrence of defects such as voids or sink marks.Internal Grant Agency of TBU in Zlin [IGA/FT/2023/005]; Plastics, metals and technology (PLAKOTECH) [CZ.01.1.02/0.0/0.0/15_007/0003397]TBU in Zlin, (CZ.01.1.02/0.0/0.0/15_007/0003397, IGA/FT/2023/005