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Surfactant-free silver nanofluids as liquid systems with neuromorphic potential
Nikitin, D. ; Biliak, K. ; Lemke, J. ; Protsak, M. ; Pleskunov, P. ; Tosca, M. ; Ali-Ogly, S. ; Červenková, V. ; Adejube, B. ; Bajtošová, L. ; Černochová, Zulfiya ; Prokeš, J. ; Křivka, I. ; Biederman, H. ; Faupel, F. ; Vahl, A. ; Choukourov, A.
Neuromorphic engineering is a rapidly developing branch of science that aims to implement the unique attributes of biological neural networks in artificial devices. Most neuromorphic devices are based on the resistive switching effect, which involves changing the device’s conductivity in response to an external electric field. For instance, percolating nanoparticle (NP) networks produced by gas aggregation cluster sources (GAS) show collective spiking behavior in conductivity reminiscent of brain-like dynamics. Nevertheless, the problem of dynamic spatial reconfiguration in solid-state neuromorphic systems remains unsolved. Herein, novel nanofluids with resistive switching properties are proposed as neuromorphic media. They are produced by depositing silver NPs from GAS into vacuum-compatible liquids (paraffin, silicon oil, and PEG) without the use of surfactants or other chemicals. When the electric field is applied between two electrodes, the migration of NPs toward biased electrode is detected in all liquids. The electrophoretic nature of the NP movement was proved by means of ζ-potential measurements. Such movement led to the self-assembly of NPs in conductive paths connecting the electrodes and, as a result, to resistive switching. The electrical response was strongly dependent on the dielectric constant of the base liquid. The Ag-PEG nanofluid demonstrated the best switching performance reproducible during several tens of current-voltage cycles. The growth of flexible and reconfigurable conductive filaments in nanofluids makes them suitable media for potential realization of 3D neural networks.
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Animal welfare in the zootherapeutic process
Hillová, Nikol ; Kocian, Matúš (advisor) ; Prokeš, Josef (referee)
This thesis is from the field of applied ethics. The aim of this thesis is to explain problematics of animal presence in the zootherapeutic process. This type of therapy doesn't have a legislative basis in the Czech Republic. There aren't uniform conditions and provisions that must be followed during do animal assisted therapy. This situation causes problems for zootherapists, animals and other therapy participants. An animal that assists in the zootherapeutic process has no special rights in the Czech Republic, even though it is more burdened than an animal in normal breeding. This thesis aims to familiarize the reader with this issue, to map the conditions for animals in the zootherapy process, and to present possible proposals for measures that could improve and clarify the conditions of the presence of animals in the zootherapy process in the Czech Republic.
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Information System Selection
Prokeš, Jiří ; Honzík, Miroslav (referee) ; Koch, Miloš (advisor)
The Bachelor thesis evaluates a current situation of an information system usage and need in a selected company together with setting criteria for choosing an optimal solution. Furthermore, relevant products available in current market are compared and, in the conclusion, the most suitable one according to specific needs of the company is recommended.
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Company Marketing Mix
Prokeš, Jan ; Škarda, Jakub (referee) ; Kaňovská, Lucie (advisor)
The theme of this thesis is definition of marketing mix of experience brasserie Pivní burza, which is engaged on the sale of draft beer for variable prices, which are changing based on demand of customers. The main points are analysis and developing the marketing mix. Then making suggestions to improvement that will help to better competitiveness of company. Concrete suggestions will be based on conducted analysis.
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Mechanical response of long-fiber-reinforced polymer composite
Škriniarová, Nina ; Prokeš, Jan (referee) ; Čech, Vladimír (advisor)
This diploma thesis is focused on monitoring of mechanical response of long-fiber reinforced polymer composite. Main part of this thesis was preparation of long-fiber reinforced composite specimens, on which matrix was reinforced by commercially sized glass fibers. For comparison of properties were prepared specimens reinforced by unsized glass fibers. Apart from preparing specimens reinforced by long glass fibers were prepared specimens contains long carbon fibers. For evaluation of mechanical response of the prepared composite specimen were used flexural test and short beam shear test. Mechanical response was evaluated with universal testing machine ZWICK Z010 and data were processed in OriginPro 8 program. Thanks to evaluation of the mechanical response of the prepared specimens was assessed adhesion to fiber-matrix interface. By examining the mechanical response or adhesion can be assessed efficiency of commercial fiber surface treatment and so standardize measurement to compare other options of surface treatments.
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High Performance Polymer Composites
Bábík, Adam ; Lapčík,, Lubomír (referee) ; Prokeš, Jan (referee) ; Čech, Vladimír (advisor)
High performance polymer composites are materials with emphasis on specific chemical and mechanical properties due to their broad scope of applications. The main advantages are high strenght and toughness in comparison with their low weight and density. An increased adhesion at composite interfaces is important to ensure excellent composite properties. Bundles of glass fibers were coated by plasma-polymerised interlayers of tetravinylsilane (pp-TVS) of different thicknesses and at different effective powers. The prepared interlayers of pp-TVS were analyzed to evaluate chemical composition (RBS, FTIR, XPS) and mechanical properties (NI-AFM). Microindentation test and fiber-bundle pull-out test were used to determine the interfacial shear strenght.
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Accompanying patients in hospitals
Zemanová, Radka ; Zimmermannová, Marie (advisor) ; Prokeš, Josef (referee)
The thesis "Counselling the Sick in Hospital" deals with the issue of hospital chaplaincy in the Czech Republic. The theoretical part defines key terms (illness, accompaniment, hospital chaplain), describes the challenges of the sick, addresses the question of their value and the meaning of life during illness, and describes the stages of coping with illness. The theological excursion deals with love from a biblical perspective and concludes with a chapter on the meaning of suffering. The empirical part consists of an analysis of articles on hospital chaplaincy, primarily interviews with chaplains. The topics from the interviews were sorted by frequency into chapters (introducing the service, prejudices, death, covid, etc.), in which chaplains express their opinions from various perspectives, which complement each other, and from which a media image of chaplaincy in the Czech Republic can be assembled. The results of their testimonies are summarized in the conclusion of the thesis.
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