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Toughness of Metallic Materials and its Testing
Michalisko, Jan ; Zapletal, Josef (referee) ; Němec, Karel (advisor)
This bachelor work deals with toughness as a mechanical property of metal materials. It defines the toughness and its demonstrations. It describes the transient behaviour of some metals at the static and dynamic load. Furthermore, the work describes the particular testing methods (Charpy‘s, Izod‘s, DWT, DT, DWTT). It covers the historical consequences of toughness testing.
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Organic electronics for biosensors
Netočný, Martin ; Vala, Martin (referee) ; Salyk, Ota (advisor)
In the first part are discussed the organic thin-film transistors and their possible use for chemical and biological sensors. Middle section discusses the electrical properties of OECT device in steady-state and transient behaviour and potential use of OECT for cell monitoring. The final experimental part deals with influence of temperature, aging, electrolyte environment and geometry on the function of OECT device.
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Magnetorheological fluid response time in shear mode
Válek, Josef ; Vimmr, Jan (referee) ; Kubík, Michal (advisor)
Magnetorheological fluids (MRF) are suspensions of (commonly) oils and carbonyl iron powder. Under magnetic field, apparent viscosity of suspension changes in short time. This so-called response time can’t be neglected in modern MR devices. Multiple response times are distinguished based on load mode. Rheological response time (MRF under shear rate) will be affected by load and composition of MRF. In this thesis, these influencing parameters are investigated, which was allowed by developing rheometer with minimal hardware response time and methodology. Gained data shows, that most affecting parameter is ratio of inner forces, described e.g., Mason number. Model of Mason number was verified for larger values, but in lower values, significant difference was observed (probably caused by different shear stress mechanism in MRF). After other investigation and clarification of model, precise prediction of MRF and MR devices behaviour will be possible, which can lead to improving their function and e.g., road safety.
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Magnetorheological fluid response time in shear mode
Válek, Josef ; Vimmr, Jan (referee) ; Kubík, Michal (advisor)
Magnetorheological fluids (MRF) are suspensions of (commonly) oils and carbonyl iron powder. Under magnetic field, apparent viscosity of suspension changes in short time. This so-called response time can’t be neglected in modern MR devices. Multiple response times are distinguished based on load mode. Rheological response time (MRF under shear rate) will be affected by load and composition of MRF. In this thesis, these influencing parameters are investigated, which was allowed by developing rheometer with minimal hardware response time and methodology. Gained data shows, that most affecting parameter is ratio of inner forces, described e.g., Mason number. Model of Mason number was verified for larger values, but in lower values, significant difference was observed (probably caused by different shear stress mechanism in MRF). After other investigation and clarification of model, precise prediction of MRF and MR devices behaviour will be possible, which can lead to improving their function and e.g., road safety.
|
|
|
Organic electronics for biosensors
Netočný, Martin ; Vala, Martin (referee) ; Salyk, Ota (advisor)
In the first part are discussed the organic thin-film transistors and their possible use for chemical and biological sensors. Middle section discusses the electrical properties of OECT device in steady-state and transient behaviour and potential use of OECT for cell monitoring. The final experimental part deals with influence of temperature, aging, electrolyte environment and geometry on the function of OECT device.
|
|
|
Toughness of Metallic Materials and its Testing
Michalisko, Jan ; Zapletal, Josef (referee) ; Němec, Karel (advisor)
This bachelor work deals with toughness as a mechanical property of metal materials. It defines the toughness and its demonstrations. It describes the transient behaviour of some metals at the static and dynamic load. Furthermore, the work describes the particular testing methods (Charpy‘s, Izod‘s, DWT, DT, DWTT). It covers the historical consequences of toughness testing.
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