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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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Detached house
Bajtošová, Lenka ; Struhala, Karel (referee) ; Jelínek, Petr (advisor)
The subject of the following bachelor thesis is the design of a family house in Soběšice, which also includes a flower shop. The building has two floors and is divided into three basic units. The flower shop is located on the ground floor with direct access from the road. The social zone of the residential part of the building covers the remaining part of the ground floor, behind the flower shop, with direct access to the terrace. On the second floor all the individual rooms of residents are situated, with a shared bathroom and with a access to two vegetation roofs covering the whole building floor. From a structural point of view, the house is designed as a masonry building made of aerated concrete blocks insulated with expanded polystyrene 150 mm thick, with reinforced concrete ceilings and a shed roof above the second floor. The bachelor thesis is elaborated in the form of project documentation for construction realization.
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Hotel
Bajtošová, Lenka ; Jelínková, Barbora (referee) ; Jelínek, Petr (advisor)
The subject of the diploma thesis is the design of a hotel with a wellness center in the cadastral area of Spišské Tomášovce. The building is atypical in shape and is made up of three floors. In front of the hotel there are parking spaces for guests and employees, from the back of the building there is a connection to the road for the purpose of supply. From the main entrance it can be entered either into the hotel lobby or directly into the restaurant. The operating part of the hotel is separated from the part used by hotel guests. The hotel’s wellness and fitness center is accessible from the hotel lobby, but also through an external entrance north of the main guest entrance. On the second floor there are double rooms and double rooms with extra beds. On the third floor there are double and quadruple apartments with kitchen. From the construction point of view, the house is designed as an object made of lime-sand blocks insulated with mineral wool 200 mm thick. It is also formed by reinforced concrete ceilings and a flat single-skin roof. The diploma thesis is processed in the form of project documentation for the construction.
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Properties of thin films studied by in-situ TEM
Bajtošová, Lucia ; Cieslar, Miroslav (advisor) ; Kopeček, Jaromír (referee)
Mechanical properties of widely applicable thin nanocrystalline films have been a sub- ject of interest for some time due to deviation of their properties from the properties of bulk and micro sized grain materials. The deformation mechanisms in these materials are altered by restricted size of the material and high ratio of surface and grain boundary areas. Recent advances in transmission electron microscopy (TEM) allow direct obser- vations of the deformation mechanisms during nanoindentation or tensile deformation of the specimen. Thin Al films prepared by DC magnetron sputtering were deformed in situ in TEM and bright field TEM. High resolution TEM and automated crystallographic orientation mapping (ASTAR) were implemented to observe the ongoing deformation mechanisms. Molecular dynamic simulation designed to approach the conditions of per- formed experiment were used to visualize the deformation mechanisms on atomic scale and the reliability of both methods was discussed. 1
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Hotel
Bajtošová, Lenka ; Jelínková, Barbora (referee) ; Jelínek, Petr (advisor)
The subject of the diploma thesis is the design of a hotel with a wellness center in the cadastral area of Spišské Tomášovce. The building is atypical in shape and is made up of three floors. In front of the hotel there are parking spaces for guests and employees, from the back of the building there is a connection to the road for the purpose of supply. From the main entrance it can be entered either into the hotel lobby or directly into the restaurant. The operating part of the hotel is separated from the part used by hotel guests. The hotel’s wellness and fitness center is accessible from the hotel lobby, but also through an external entrance north of the main guest entrance. On the second floor there are double rooms and double rooms with extra beds. On the third floor there are double and quadruple apartments with kitchen. From the construction point of view, the house is designed as an object made of lime-sand blocks insulated with mineral wool 200 mm thick. It is also formed by reinforced concrete ceilings and a flat single-skin roof. The diploma thesis is processed in the form of project documentation for the construction.
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Detached house
Bajtošová, Lenka ; Struhala, Karel (referee) ; Jelínek, Petr (advisor)
The subject of the following bachelor thesis is the design of a family house in Soběšice, which also includes a flower shop. The building has two floors and is divided into three basic units. The flower shop is located on the ground floor with direct access from the road. The social zone of the residential part of the building covers the remaining part of the ground floor, behind the flower shop, with direct access to the terrace. On the second floor all the individual rooms of residents are situated, with a shared bathroom and with a access to two vegetation roofs covering the whole building floor. From a structural point of view, the house is designed as a masonry building made of aerated concrete blocks insulated with expanded polystyrene 150 mm thick, with reinforced concrete ceilings and a shed roof above the second floor. The bachelor thesis is elaborated in the form of project documentation for construction realization.
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Distribution of dispersoids in rapidly solidified aluminium alloys.
Bajtošová, Lucia ; Cieslar, Miroslav (advisor) ; Šíma, Vladimír (referee)
Dispersoids formed during rapid solidification of a quaternary Al-Fe-Mn-Si alloy prepared by twin-roll casting and their transformation after following heat treatment were studied. A conventional transmission electron microscopy and modern automated phase identification methods such as electron backscatter diffraction in scanning electron microscope and automated orientation crystal phase and orientation mapping in transmission microscopy were applied. Energy dispersive X-ray spectroscopy was used to determine the chemical composition of the dispersoids. The phase identification methods were tested on as cast samples and samples annealed for 4 hours at 580 žC. Strategies for statistical evaluation of particle distribution and their crystallographic structure were discussed.
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