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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 (oponent) ; Jelínek, Petr (vedoucí práce)
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 (oponent) ; Jelínek, Petr (vedoucí práce)
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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Vlastnosti tenkých vrstev studované pomocí in-situ TEM.
Bajtošová, Lucia ; Cieslar, Miroslav (vedoucí práce) ; Kopeček, Jaromír (oponent)
Mechanické vlastnosti široko aplikovateľných tenkých nanokryštalických filmov sú už nejakú dobu objektom záujmu pre ich rozdiely od vlastností typicky pozorovaných v objemových materiáloch so zrnami na mikrometrovej škále. Deformačné mechanizmy v týchto materiáloch sú ovplyvnené obmedzenou veľkosťou materiálu ako aj vysokým per- centom plochy voľného povrchu a plochy hraníc zŕn. Nedávne pokroky v transmisnej elektrónovej mikroskopii (TEM) umožnili priame pozorovanie deformačných mechaniz- mov počas nanoindentácie či ťahovej skúšky vzorkov. Tenké Al filmy pripravené metódou naprašovania jednosmerným prúdom boli deformované in-situ TEM a metódy svetlého poľa TEM, TEM vysokého rozlíšenia a automatického mapovania fáz a orientácií boli uplatnené na pozorovanie prebiehajúcich deformačných procesov. Metóda molekulárnej dynamiky bola použitá na simuláciu podmienok vykonaných experimentov a vizualizáciu deformačných mechanizmov na atomárnej úrovni, čo podmienilo diskusiu spoľahlivosti a kompatibality oboch metód. 1
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Hotel
Bajtošová, Lenka ; Jelínková, Barbora (oponent) ; Jelínek, Petr (vedoucí práce)
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 (oponent) ; Jelínek, Petr (vedoucí práce)
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 (vedoucí práce) ; Šíma, Vladimír (oponent)
Práca sa zaoberá analýzou disperzných častíc vytvorených počas nerovnovážneho stuhnutia kvaternárnej Al-Fe-Mn-Si zliatiny pripravenej metódou spojitého odlevu medzi valcami a ich transformáciou po následnom tepelnom spracovaní. Pri štúdiu boli použité metódy konvenčnej transmisnej elektrónovej mikroskopie ako aj moderné metódy automatickej identifikácie fáz zahŕňajúce difrakciu spätne odrazených elektrónov v rastrovacom elektrónovom mikroskope a automatické určovanie a mapovanie orientácie kryštálov a fáz v transmisnom elektrónovom mikroskope. Chemické zloženie disperzoidov bolo určené pomocou röntgenovej spektroskopie. Metódy boli testované na priamo odliatych vzorkách aj vzorkách žíhaných 4 hodiny pri teplote 580 žC. Následne bol navrhnutý postup pre štatistické vyhodnotenie distribúcie a kryštalografickej štruktúry častíc.
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