Tomas Bata University in Zlín
Institutional repository of Tomas Bata University LibraryNot a member yet
10673 research outputs found
Sort by
Simulation-based model optimization for a steam-filled chamber. Part I: Open-loop identification
No full textThis paper presents a study of simulation-based model optimization for an industrial application of a steam-filled chamber under different operating conditions. Open-loop input/output process data are used to optimize selected linear models of different complexity in the form of continuous transfer functions. The optimization is performed using the MATLAB computing system and its toolboxes for simulation and optimization. More specifically, the nonlinear programming solver fmincon has been fruitfully utilized in this study for the task. Based on the suggested criteria, a suitable model in the form of a second-order astatic system with time-delay has been chosen as a trade-off between its simplicity and fidelity, which is confirmed by experimental comparison. As the modelled process is non-linear in nature, the resultant model parameters vary for different process conditions. The results of this work are further usable for both building a simulation testing model of the system and for the subsequent step – control system design and tuning purposes. The suggested solution enables to obtain a relatively simple but control-relevant model of the investigated process, linking directly controlled and control input variables, which is advantageous from the control system design point of view. © 2021 Praise Worthy Prize S.r.l.-All rights reserved.Grantová Agentura České Republiky, GA ČR: 21-45465
Metabolic syndrome and NAFLD in a social reintegration facility environment-project results
Get PDFIntroduction: Metabolic syndrome (MS) is a metabolic disease characterized by a simultaneous occurrence of several risk factors (RF) for the development of cardiovascular diseases. NAFLD - Non-alcoholic fatty liver disease - is characterized by the presence of hepatic steatosis, i.e. excessive accumulation of fat in liver tissue that is associated with insulin resistance. Objectives: To determine the presence of MS and liver diseases in clients of the Social Reintegration Facility in Zakovce. The project "Screening of liver diseases in Social Reintegration Facility" ran from 1/2020 to 10/2020. It was carried out within the institutional project of the St. Elizabeth University of Health and Social Sciences (VSZaSP sv. Alzbety) and the Slovak Society of Practical Obesitology (SSPO). Participants and methods: A total of 229 clients and employees of the Social Reintegration Facility of the Institute of Christ the High Priest in Zakovce: 188 clients (82%); 41 employees (18%). Men made up 63% of the sample (145); women 37% (84). The mean age of the clients was 51.4 years, the mean length of their stay in the facility was 5.87 years. We clinically examined the clients and employees, and we collected venous and capillary blood. We examined the stiffness of liver tissue with transient elastography, and we used a special CAP software to quantify the presence of steatosis. Results: In the group of examined clients and employees of the Social Reintegration Facility in Zakovce, we were in particular looking for the presence of liver diseases. However, we also found the presence of other diseases of civilization that have a statistically significant effect on the indicators of MS, FLI, NFS, APRI, FIB-4, FS and CAP. Other research results are described by the authors in more detail in the article. Conclusion: NAFLD is considered to be a slowly progressing chronic liver disease in both, adults and children. Besides taking care of our outpatient clinics patients, we should not forget about clients of the social reintegration facilities, in whom - due to the presence of several risk factors the incidence of liver diseases and other diseases of civilization is even higher compared to the general population
Transient pattern – the model of digital layout
No full textUnlike a rectangular grid arrangement, electronic writing has a character of a cross-linked and developing writing technique. The network of interconnected hypertext was compared with the human neural network Writing identity is reflected in the hypertext, as dynamic, flexible, variable, and even random. According to several authors [Manovich, 2001; Aarseth, 1997; Bootz and Baldwin, 2010 and others], the paradigm of digital mediation is manifested by changes in the approach to the production, storage, media distribution, and reception of literary, conceptual, or other "textual" artworks. In the position of an e-literature programmed form, Philippe Bootz reflected that those changes in the description of a procedural model of communication and the introduction of performative signs are a part of the aesthetic approach. The information which flows from the source (made by authors) to the target (reader’s reading) could be embodied in the digital text and represented, manifested, or articulated by the digital text layout, which will be shaped on/in various interfaces, instead of the plane and rectangular of "screens". Digital text which is manifested by a layout should take place on/in current and future, digital and hybrid interfaces. This kind of layout could bring the reader into the text work, and closer to its essence. The posthumanistic approach of the digital layout problem solution will change the point of view, which is focused on a human, to the wider equal interrelations of technical, biological, and human intelligent actors. The flexible shape of complex and experimental digital layout solutions could be manifested on/in many different interfaces. In my work I propose a new definition of digital layout and a hypothetical solution - the model Transient Pattern. The model offers a space in which the creation of a digital layout could take place in different solutions - free of a grid pattern organization. These considerations pave the way for a new approach to the formal grasp of a digital text arrangement in a more comprehensive, unbiased, and experimental way. The new approach subsequently leads to a change in the aesthetic paradigm: from creating a digital text layout as a finally programmed form of an object to variable variations of running the program in the process of becoming. It includes both a dialectical complex pattern (presenting a systematic rational and formal approach) and randomness (of actual reading and variability of interfaces) that open access to hybrid unstable forms. The solution enables the flexible organization of a text in digital and post-digital spaces, in current and future conditions of monitoring the possibilities of new techniques of text production and reception, co-created by human, computer and the other nonhuman intelligent actors. At the same time, it changes our understanding from redesigned forms of grid or template principles to variable designing by processes. © 2021 Association for Computing Machinery
One-step synthesis of gold nanoparticles for catalysis and SERS applications using selectively dicarboxylated cellulose and hyaluronate
Get PDFProperties and applications of gold nanoparticles (AuNPs) depend on their characteristics which are intrinsically connected to the reducing and capping agents used in their synthesis. Although polysaccharides are commonly used for Au salt reduction, the control over the result is often limited. Here, the selectively dicarboxylated cellulose (DCC) and hyaluronate (DCH) with adjustable composition and molecular weight are used for the first time as reducing and capping agents for AuNPs preparation in an environmental friendly one-step synthesis. Mechanism of reduction and structure-function relationships between the composition of oxidized poly-saccharides and properties of formed AuNPs are elucidated and the variances in the macromolecular architecture of dicarboxypolysaccharides are applied to guide the growth of AuNPs. While the homogenous structure and high density of carboxyl groups of fully-oxidized DCC induced isotropic growth of small and uniform AuNPs with good catalytic performance (d =-20 nm, TOF = 7.3 min(-1), k = 1.47 min(-1)), the lower stabilizing potential and slower reduction rates of the DCH induced the anisotropic growth of larger polyhedral -50 nm nanoparticles, which increased the Surface-Enhanced Raman Scattering efficacy (9x stronger Raman signals on average compared to AuDCC). The use of dicarboxypolysaccharides with adjustable composition and properties thus introduced a new degree of freedom for the preparation of AuNPs with desired properties.LM2018127; IGA/CPS/2021/002, RP/CPS/2022/007, TBU - IGA/CPS/2020/003; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMTMinistry of Education, Youth and Sports of the Czech Republic - DKRVO [RP/CPS/2022/007]; Internal Grant Agency; Ministry of Education, Youth and Sports of the Czech Republic; [TBU-IGA/CPS/2020/003]; [IGA/CPS/2021/002]; [LM2018127
Technology management practices and innovation: Empirical evidence from medium- and large-scale manufacturing firms in Ethiopia
Get PDFIn order to investigate empirically the effects of technology management on firm innovation, this paper considers the antecedents and multidimensional views of technology management mechanisms on innovation performance in medium- and large-scale manufacturing firms in a developing country, namely Ethiopia. Using simple random sampling, a total of 200 firms were chosen for this study to obtain responses from respondents. Four hypotheses were proposed for testing. Structural equation modelling and cross-sectional design were used to analyze the data using the LISREL 8.80 SIMPLIS program software tool. This study finds technology transfer and technology acquisition have significant positive effects on process innovation, product innovation, and method innovation. Technology process has a significant positive effect on process and method innovation. Technology absorption has a significant positive effect on product innovation. The major implication of this study is that technology management, coupled with appropriate technology management policies and strategies, is an appropriate resource to be used in the organization to enhance firm performance, particularly innovation and creativity. The paper contributes to the literature in that, unlike previous studies that are based on one aspect of technology management practices, this study examined the effects of each different type of technology management dimension on firms' innovation. Thus, this study helps to gain further insights into the effects of technology management practices on firm innovation.Tomas Bata University in Zlin [IGA/FaME/2020/003]; Hawassa Universit
Green synthesis of titanium and zinc oxide nanoparticles for simultaneous photocatalytic removal of estrogens in wastewater
Get PDFThis study reports on the green synthesis of titanium and zinc oxide nanoparticles (ZnO-NPs) using lemon juice and peel extract, zinc acetate, ethylene glycol, and titanium IV isopropoxide as precursors. The prepared TiO2 and ZnO-NPs were characterized via X-ray Diffraction analysis, UV-vis spectroscopy, dynamic light scattering, scanning electron microscopy, and EDAX. The as-prepared samples, TiO2 and ZnO-NPs, were further subjected for the photocatalytic degradation of estrogenic hormones (Estrone, Estradiol, Ethinylestradiol, and Estriol) under UV light irradiation at 365 nm, which resulted in promising photocatalytic activity. All four hormones were significantly degraded owing to the photocatalytic activity combined with a slight contribution (4-11 %) from the hormonal adsorption onto the surface of the photocatalysts. Overall hormonal degradation rates in the range of 84-93 % and approximately 99 % were achieved in 60 minutes under UV light irradiation by ZnO and TiO2, respectively. © 2021 NANOCON Conference Proceedings - International Conference on Nanomaterials. All rights reserved.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: IGACPS2021002, RP/CPS/2020/002; Univerzita Tomáše Bati ve Zlín
Furcellaran as a substitute for emulsifying salts in processed cheese spread and the resultant storage changes
Get PDFThe viscoelastic properties of processed cheese spread (PCS; dry matter 40% w/w, fat in dry matter 55% w/w) produced with various levels (0.10, 0.25, 0.50, 0.75 and 1.00% w/w) of two types of furcellaran (FA or FB), with and without the use of emulsifying salts (ES), were evaluated. The incremental higher levels of furcellaran application, irrespective of its type, increased the values of viscoelastic moduli. Processed cheese spread samples produced without the addition of ES showed higher rigidity. The type and concentration of furcellaran, the presence/absence of ES and storage time had a significant effect on the viscoelastic properties of PCS.internal grant agency of the Tomas Bata University in Zlin, Czech Republic [IGA/FT/2022/005
DNA functionalized spider silk nanohydrogels for specific cell attachment and patterning
Get PDFNucleated protein self-assembly of an azido modified spider silk protein was employed in the preparation of nanofibrillar networks with hydrogel-like properties immobilized on coatings of the same protein. Formation of the networks in a mild aqueous environment resulted in thicknesses between 2 and 60 nm, which were controlled only by the protein concentration. Incorporated azido groups in the protein were used to "click" short nucleic acid sequences onto the nanofibrils, which were accessible to specific hybridization-based modifications, as proved by fluorescently labeled DNA complements. A lipid modifier was used for efficient incorporation of DNA into the membrane of nonadherent Jurkat cells. Based on the complementarity of the nucleic acids, highly specific DNA-assisted immobilization of the cells on the nanohydrogels with tunable cell densities was possible. Addressability of the DNA cell-to-surface anchor was demonstrated with a competitive oligonucleotide probe, resulting in a rapid release of 75-95% of cells. In addition, we developed a photolithography-based patterning of arbitrarily shaped microwells, which served to spatially define the formation of the nanohydrogels. After detaching the photoresist and PEG-blocking of the surface, DNA-assisted immobilization of the Jurkat cells on the nanohydrogel microstructures was achieved with high fidelity.CZ.02.2.69/0.0/0.0/19_073/0016941, LTAB19019; JC-2019-21; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMTBavarian-Czech Academic Agency (Bayerisch-Tschechische Hochschulagentur) BTHA [JC-2019-21]; Ministry of Education, Youth and Sports of the Czech Republic, BTHA/BAYHOST project [LTAB19019]; project OP RDE Junior Grant of Tomas Bata University in Zlin [CZ.02.2.69/0.0/0.0/19_073/0016941
ĮSA koncepcija ir numanomas jos įgyvendinimas Cišegrado šalių MVĮ versle
No full textThe papers' objective was to present essential factors of CSR conception, quantify their intensity and compare these factors within the countries of V4. The research was conducted through an online questionnaire in the countries of V4 (Czech Republic. Slovak Republic, Poland, and Hungary) from September 2019 to March 2020. The total amount of valid questionnaires was 1,585. Stated research hypotheses were tested by chi-square and Z-score Some interesting conclusions as low knowledge of CSR concept, low intensity of (SR implementation. low ability to identify positive effects of CSR were revealed by the research whereby the opinions differ in the Czech Republic and other countries of V4. Despite some research limitations, the study's findings should be considered in light of new trends and findings. It could be argued that the corona crisis would highly determine the results of the empirical research. On the other hand. it could be assumed that the economy will gradually recover and return to normal, which causes that these results will become relevant again
LoRaWAN network security using simulated scenarios
No full textThe article describes the LoRaWAN network. LoRaWAN is a communication protocol that provides long-distance communication with low power consumption. Long Range Wide Area Networks (LoRaWAN) is open-center access (MAC) layer technology designed for long-distance connections with a large number of low-energy devices. LoRaWAN devices in various network settings use the most modern network simulator (NS-3). First, one device and its mobility are introduced. Due to its properties, the protocol is very popular in the field of the Internet of Things. In this context, the security of this protocol is of great importance given the current ubiquity of the Internet. The article deals with eavesdropping and eavesdropping combined with decryption of LoRaWAN communication on the physical layer and on the Media Access Control sublayer of the line layer. The article focuses on the security gap within the backward compatibility of the LoRaWAN protocol. It currently uses the LoRaWAN protocol in version 1.1.x, which addresses the main security gap from the previous 1.0.x protocol. The article uses a software-defined radio to listen to the news. The article verify backward compatibility by replaying the message and sending the fake message to the server. © 2021 International Multidisciplinary Scientific Geoconference. All rights reserved.Univerzita Tomáše Bati ve Zlíně: IGA/FAI/2021/00