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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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Development of Business Activities of Company R.C.P.R. Reality, s. r. o.
Červenková, Veronika ; Kolesa, Jan (referee) ; Šimberová, Iveta (advisor)
The thesis focuses on the development of business activities of the company R.C.P.R. Reality. The theoretical basis of the work include a general intruduction of the topic, defining the main concepts, methods and tools used within the business. The practical part contains a presentation of the company, analyzing the current situation and submit their own design solutions to improve it. The aim is propose a final concept and business strategy, leading to the development of the company and consolidate its position in the market.
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Plasma methods for modification and preparation of biopolymers
Červenková, Veronika ; Nikitin, Daniil (advisor) ; Kolská, Zdeňka (referee)
The thesis covers the main results of research on atmospheric pressure plasma modi- fication of biopolymers for the preparation of functional materials. Sodium alginate solu- tions processed by means of a plasma jet were successfully used for the casting of foils with advanced mechanical properties. It was observed that alginate's final performance does not only depend on the originating biopolymer viscosity but is significantly influenced by the type of working gas used for plasma modification. The antibacterial effect of alginate foils incorporated with almond essential oil was demonstrated as a promising extension of alginate's application in food storage. The results of plasma-initiated degradation of high-molecular-weight chitosan were studied in terms of its water-solubility. The analysis of structural properties demonstrated deep destruction of chitosan including the fragmen- tation of low-molecular-weight oligomers presented in the control sample. The fraction perfectly soluble in water was obtained using plasma processing as was demonstrated by NMR. The plasma solution system was demonstrated to be a suitable tool for enhancing chitosan's degradation for a possible application in crop protection. 1
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Financing of social care services for the elderly in the Czech Republic - current problems and challenges
Červenková, Vladimíra ; Mašková, Pavla (advisor) ; Bareš, Pavel (referee)
The thesis "Financing of Social Care services for the Elderly in the Czech Republic - Current Problems and Challenges" deals with analysis of system of social care services for the elderly in view of the fact that the current financing form is subject to criticism for its inefficiency. The aim of this thesis is to critically reflect changes in the provision and financing of social care services for the elderly in the Czech Republic after 2007 in the context of current challenges related to long-term social care and health care. The thesis in its introduction first deals with the formulation of the research problem, deals with particular targets, research questions and the methods of data collection, which are the methods of analysis and public policy making and qualitative research methods. It also discusses the theoretical background of social services and their financing. The next chapter of the thesis deals with the system development of social services and changes in the provision and financing of social care services, which occurred in connection with the adoption of Act No. 108/2006 Coll., On social services. The following chapter deals with analysis of the financing form of social care services in terms of financial resources and problems of financing these services through the care...
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Influence of non-equilibrium plasma on seeds
Červenková, Veronika ; Kylián, Ondřej (advisor) ; Solař, Pavel (referee)
Agriculture was, is and will always be one of the most important economic sectors owing to its primary purpose: the global food security. Forming the base pillar of the so- ciety's system, it is the privilege of nations to make their products accessible to everyone, regardless of the environmental or economical conditions. The employment of the newest technologies in order to secure its regulation gave rise to a brand new field of science - plasma agriculture. Plasma agriculture examines the use of non-thermal plasma on natural sources with diverse objectives. Soil rehabilitation, microbial food decontamination or insecticide acti- vities are not the only examples. In this thesis we shall devote to the DBD air plasma application on the Pumpkin seeds (sort Small Sugar) in order to improve its germination. After verifying the selected plasma source impact on eight polymer foils the main focus was given to the seeds. It was found that the plasma treatment induces changes in the chemical composition and water droplet drying dynamics that in turn result in dramatic increase of surface wettability. These changes must not have been accompanied by the burning; otherwise the treatment led to a radical disruption of seeds' morphology and to failure of the essential - enhancement of the germination rate. 1
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Financing of social care services for the elderly in the Czech Republic - current problems and challenges
Červenková, Vladimíra ; Mašková, Pavla (advisor) ; Bareš, Pavel (referee)
The thesis "Financing of Social Care services for the Elderly in the Czech Republic - Current Problems and Challenges" deals with analysis of system of social care services for the elderly in view of the fact that the current financing form is subject to criticism for its inefficiency. The aim of this thesis is to critically reflect changes in the provision and financing of social care services for the elderly in the Czech Republic after 2007 in the context of current challenges related to long-term social care and health care. The thesis in its introduction first deals with the formulation of the research problem, deals with particular targets, research questions and the methods of data collection, which are the methods of analysis and public policy making and qualitative research methods. It also discusses the theoretical background of social services and their financing. The next chapter of the thesis deals with the system development of social services and changes in the provision and financing of social care services, which occurred in connection with the adoption of Act No. 108/2006 Coll., On social services. The following chapter deals with analysis of the financing form of social care services in terms of financial resources and problems of financing these services through the care...
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Development of Business Activities of Company R.C.P.R. Reality, s. r. o.
Červenková, Veronika ; Kolesa, Jan (referee) ; Šimberová, Iveta (advisor)
The thesis focuses on the development of business activities of the company R.C.P.R. Reality. The theoretical basis of the work include a general intruduction of the topic, defining the main concepts, methods and tools used within the business. The practical part contains a presentation of the company, analyzing the current situation and submit their own design solutions to improve it. The aim is propose a final concept and business strategy, leading to the development of the company and consolidate its position in the market.
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