|
|
Aprotic electrolytes for supercapacitors
Musílek, Václav ; Knotek, Tomáš (referee) ; Dvořák, Petr (advisor)
This master´s thesis deals different types of the aprotic electrolytes for supercapacitors and investigates by impedance spectroscopy to conductivity and method cyclic voltametry to measure dimension potential windows. Used aprotic solvents: propylencarbonate, dimethylsulfoxide, N, N dimethylformamide, ethylencarbonate, dimethylcarbonate, diethylcarbonate and acetonitrile. In the aprotic solvents were appended salts: LiClO4, NaClO4, KClO4, LiBF4, LiPF6, TEABF4 and TMABF4. From these compounds were prepared solutions with the different molar concentrations.
|
|
|
Electrodes for electrolyser
Kaňa, Ondřej ; Knotek, Tomáš (referee) ; Sedlaříková, Marie (advisor)
In my diploma work i focus on the production hydrogen by electrolysis of water using by electrolyzer. Especially, i concentrate on preparation electrodes for laboratory electrolyzer. I work on principles of increasing electrodes area, increasing functional surface of electrodes, by Nickel – Zinc coatings. By electroplating or chemical plating we spread microlayer of Nickel-Zinc onto electrodes made of steel plate. Then, in alkali - hydrate oxide, we will corrode Zinc components off the alloy and this is how we create pore surface of electrode. From macroscopic view, electrode has same geometrics propositions, however from microscopics view, the electrode has bigger surface area. The hydrogen production increases with unchanget sizes of electrolyzer.
|
|
|
Reliability of lead free solder joint
Paško, Martin ; Knotek, Tomáš (referee) ; Stejskal, Petr (advisor)
This thesis deals with voids formation in lead-free soldered joint. In theoretical part are described types of voids, voids formation, effect on join reliability, effect reflow profile on voids formation and effect of surface finish on voids formation. In practical part is investigated a effect of thermal stress on voids growth.
|
|
|
Electrolyzer for hydrogen production
Kunovjánek, Miroslav ; Knotek, Tomáš (referee) ; Sedlaříková, Marie (advisor)
The work is concerned with a production of hydrogen and oxygen through by the help of electrolytic process in a device called electrolyzer. The basis of the work is assurance of the best efficiency of this process by testing a variety of materials and surfaces of electrodes, and testing different types of alkalic electrolytes.
|
|
|
The effect of the canonical Wnt singalling pathway on the differentiation of polydendrocytes after ischemic brain injury
Knotek, Tomáš ; Anděrová, Miroslava (advisor) ; Romanyuk, Natalyia (referee)
Polydendrocytes, or NG2 glia, are fourth type of glial cells in mammal central nervous system. In the adult brain, NG2 glia represent important cell type with respect to their role in gliogenesis and nervous tissue regeneration following injury. Ligands from the Wingless/Int (Wnt) family play key role in proliferation and differentiation of NG2 glia and they can also influence regeneration of nervous tissue after ischemia. The aim of this thesis was to elucidate the role of NG2 glia in neurogenesis and gliogenesis following ischemic brain injury and investigate the impact of Wnt signalling on the reaction of NG2 glia to this type of injury. To fulfil these aims, transgenic mouse strains with tamoxifen-inducible recombination, that enabled simultaneous expression of red fluorescent dye and either activation or inhibition of the Wnt signalling pathway in NG2 glia, were employed. To induce ischemic injury, middle cerebral artery occlusion model was used. Changes in differentiation and electrophysiological properties of NG2 glia were analysed using patch-clamp technique. Activation of the Wnt signalling pathway under physiological conditions and 7 days after ischemic injury led to increased differentiation of NG2 glia toward astrocytes, while 3 days after ischemic injury activation of this signalling...
|
|
|
The effect of the canonical Wnt singalling pathway on the differentiation of polydendrocytes after ischemic brain injury
Knotek, Tomáš ; Anděrová, Miroslava (advisor) ; Romanyuk, Natalyia (referee)
Polydendrocytes, or NG2 glia, are fourth type of glial cells in mammal central nervous system. In the adult brain, NG2 glia represent important cell type with respect to their role in gliogenesis and nervous tissue regeneration following injury. Ligands from the Wingless/Int (Wnt) family play key role in proliferation and differentiation of NG2 glia and they can also influence regeneration of nervous tissue after ischemia. The aim of this thesis was to elucidate the role of NG2 glia in neurogenesis and gliogenesis following ischemic brain injury and investigate the impact of Wnt signalling on the reaction of NG2 glia to this type of injury. To fulfil these aims, transgenic mouse strains with tamoxifen-inducible recombination, that enabled simultaneous expression of red fluorescent dye and either activation or inhibition of the Wnt signalling pathway in NG2 glia, were employed. To induce ischemic injury, middle cerebral artery occlusion model was used. Changes in differentiation and electrophysiological properties of NG2 glia were analysed using patch-clamp technique. Activation of the Wnt signalling pathway under physiological conditions and 7 days after ischemic injury led to increased differentiation of NG2 glia toward astrocytes, while 3 days after ischemic injury activation of this signalling...
|
|
|
Membrane properties of NG2 glia in CNS
Knotek, Tomáš ; Anděrová, Miroslava (advisor) ; Hrčka Krausová, Barbora (referee)
NG2 glia represent a new type of glial cells in central nervous system, which does not belong to astrocytes, oligodendrocyte or microglia. and their most frequent marker is chondroitine sulphate proteoglycan NG2. These cells keep their proliferation ability in adult brain and it is generally accepted that they can differentiate into oligodendrocytes. This thesis summarize the current knowledge about membrane properties of NG2 glia, namely expression of numerous types of ion channels and ionotropic and metabotropic receptor on their membrane. NG2 glia express outwardly and inwardly rectifying K+ channels, Ca2+ activated K+ channels and two-pore domain K+ channels. Interestingly, they also express voltage gated Na+ channels, L, T, P/Q and N type Ca2+ channels and voltage gated Cl- channels. Furthermore, nonspecific cationic channels, such as HCN and TRP, were identified in NG2 glia and they express Na+ /Ca2+ exchanger at high level. There are also ionotropic and metabotropic glutamate and GABA receptors on NG2 glia membrane, together with nicotinic and muscarinic receptors, adrenergic and glycine receptors, metabotropic and ionotropic purinergic receptors, receptors for serotonine, dopamine and histamine. Ion channels and receptors in NG2 glia play an important role in their proliferation,...
|
|
|
Reliability of lead free solder joint
Paško, Martin ; Knotek, Tomáš (referee) ; Stejskal, Petr (advisor)
This thesis deals with voids formation in lead-free soldered joint. In theoretical part are described types of voids, voids formation, effect on join reliability, effect reflow profile on voids formation and effect of surface finish on voids formation. In practical part is investigated a effect of thermal stress on voids growth.
|
|
|
Aprotic electrolytes for supercapacitors
Musílek, Václav ; Knotek, Tomáš (referee) ; Dvořák, Petr (advisor)
This master´s thesis deals different types of the aprotic electrolytes for supercapacitors and investigates by impedance spectroscopy to conductivity and method cyclic voltametry to measure dimension potential windows. Used aprotic solvents: propylencarbonate, dimethylsulfoxide, N, N dimethylformamide, ethylencarbonate, dimethylcarbonate, diethylcarbonate and acetonitrile. In the aprotic solvents were appended salts: LiClO4, NaClO4, KClO4, LiBF4, LiPF6, TEABF4 and TMABF4. From these compounds were prepared solutions with the different molar concentrations.
|
|
|
Electrodes for electrolyser
Kaňa, Ondřej ; Knotek, Tomáš (referee) ; Sedlaříková, Marie (advisor)
In my diploma work i focus on the production hydrogen by electrolysis of water using by electrolyzer. Especially, i concentrate on preparation electrodes for laboratory electrolyzer. I work on principles of increasing electrodes area, increasing functional surface of electrodes, by Nickel – Zinc coatings. By electroplating or chemical plating we spread microlayer of Nickel-Zinc onto electrodes made of steel plate. Then, in alkali - hydrate oxide, we will corrode Zinc components off the alloy and this is how we create pore surface of electrode. From macroscopic view, electrode has same geometrics propositions, however from microscopics view, the electrode has bigger surface area. The hydrogen production increases with unchanget sizes of electrolyzer.
|
guest ::
RSS feed.