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Pressure Sensors Based on Modern Nanotechnologies
Magát, Martin ; Hudec, Lubomír (referee) ; Vlach, Radek (referee) ; Vrba, Radimír (advisor)
This thesis describes utilization of a nanotechnology in new pressure sensors. Detailed analysis of individual principles are carrying on. And simulations and experimental models of sensors are developed. More detailed description is provided for new capacitive pressure sensor, which is manufactured using nanotechnology, including its model and analysis in order to improve its properties. The work deals with the emission pressure sensor which uses the principle of cold emissions, including analysis comparison of the measured values of the emission current from the applied nanotubes field and analysis to improve emissions performance.
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Generalized design of frequency filters with operational amplifiers
Dokoupil, Drahomír ; Minarčík, Martin (referee) ; Vrba, Kamil (advisor)
This thesis is about general design of frequency-selection filter with help of autonomous circuits. Operational amplifier has been chosen as active device/element. In the begining of this project is described role of frequency-selection filters in electronics circuits, their basic types and their transmission function. Another part of this thesis dissertate about construction of autonomous circuits, selection of suitable admittance network and it's simplification. Selected autonomous circuits are initial elements to find out known connections of frequency-selection filters. Last part of this thesis describing work with SNAP software, ways to find new connection of filter and describe how autonomous circuit works in voltage or current mode.
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Sanitation installation in historic building
Vrba, Martin ; Aberlová, Simona (referee) ; Vrána, Jakub (advisor)
This Master’s thesis deals with sanitation installation in historic building. The theoretical part of the topic analysis deals with the issue waste water discharge from the building and ground floor. Furthermore, the theoretical solutions are processed sanitation installation and variants of it. Preferable variant is finalized the details of the implementation of the project.
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DECISIONS
Vrba, Martin ; Magid, Václav (referee) ; Sterec, Pavel (advisor)
Presented work tries to reflect the structure of human world, which is able to create an overman as an artificial intelligence through its self-destructive tendency. It investigates the possibilities of our imagination and if we are able to think about artificial intelligence as a sui generis continuation of human species. Hand in hand it tries to create a tension between particular ethico-political decisions and subsequent binding structure, which they implies.
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Analog frequency filter design using signal flow graphs
Petlák, Martin ; Vrba, Kamil (referee) ; Minarčík, Martin (advisor)
In my graduation thesis I first of all shortly mentioned frequency–selection filters and their utilisations. However, the base point of this project was to acquaint with different types of signal flow diagrams with whom I should design and analyse frequency-selection filtres with conventional and also innovative active components. As the first I created signal flow diagrams for both voltage and current conveyors. These modern active components are well known today and enable the construction of circuits with better properties than circuits with traditional differentiating amplifiers with voltage feedback. Thereinafter I made signal flow diagrams for OTA component. Transconductancal amplifiers are well known active components used in various areas of analog signal processing. OTA amplifier is in fact the current source controlled by voltage difference, which is characterised by gm transconductance. Ulterior components were IOZ and IZN models of voltage amplifier with voltage gain A. The last component was COA amplifier. It is a current operational amplifier. COA model is fully dual component to VOA, which is classical voltage amplifier. In my project I used filters with two OTA components. This filter offers functions like low-pass filter, band-pass filter, high-pass filter, band-stop filter and two-phase network. Following this I used circuits with two GCC conveyors. These offer band-pass filter, low-pass filter, high-pass filter, band-stop filter and two-phase network. Ultimately I designed filters with COA components, which offer three transmission functions simultaneously (DP, PP and HP). Analysis of these filters was made with a help of PSpice computer programme.
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Conceptual design of a heat switch installation into a structure of satellite
Vrba, Martin ; Horák, Marek (referee) ; Mašek, Jakub (advisor)
Tato diplomová práce je zaměřena na sestavení přehledu konstrukcí a teplených cest kosmických lodí a kosmických vozidel, které se v současné době používají. Na základě specifických požadavků a standardů jsou vypracovány koncepční návrhy zástavby tepelného spínače do konstrukce družice. V jednotlivých kapitolách jsou popsány určité členy, které se na vedení tepla podílí a jsou důležité pro navrhované koncepty z pohledu konstrukce. Diplomová práce popisuje postupy výpočtu tepelných vodivostí a rozložení působící tíhové síly do míst uchycení pro jednotlivé koncepty. Na závěr provádí hodnocení a výběr potenciálně nejvhodnějšího návrhu.
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Bifurcation analysis of electric drive
Mach, Martin ; Vrba, Jaromír (referee) ; Koláčný, Josef (advisor)
This master thesis is deals with phenomenon of bifurcation in DC drive. It contains theoretical part, results of simulations and measurements of real DC drive in laboratory. The simulations was made in MATLAB, their results are bifurcation diagrams for different value of parameters. Target of measurement in laboratory was observed bifurcation on the real DC drive. Results of measurement are too transformed to bifurcation diagrams.
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Revitalization and flood control on the river Oslava and selected tributary
Kopuletý, Martin ; Vrba, Jan (referee) ; Veselý, Jaroslav (advisor)
The thesis is focused on the flood protection of the town of Oslavan on the river Oslava and its tributary Balinka. Sample samples were taken to determine the grain curve. The input data were obtained from the Povodí Moravy s. p. and were calculated in the HEC-RAS program. A level and flood analysis was developed and flood control measures were proposed. The flow was again calculated with the proposed measures and re-analyzed. At the end of the work the proposed measures were evaluated.
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Voltage Conveyor Conception Design and Its Applications
Minarčík, Martin ; Vrba, Kamil (advisor)
This doctoral thesis deals with a voltage conveyor as a new active element for an analog signal processing. Various types of the voltage conveyors have been defined as a dual active elements to current conveyors based on a duality principle. Conception of a new active element that can supply all types of the voltage conveyors have been proposed. The active element has been named an universal voltage conveyor – UVC. A voltage follower is a basic building block of the UVC. The well-known circuit realization of the voltage follower comes from four transconductance amplifiers with key parameters (voltage transfer and output resistance) derived from relative accuracy of used transconductance amplifiers has been used by UVC fabrication. A new circuit realization of the voltage follower comes from three transconductance amplifiers with key parameters also derived from relative accuracy of used transconductance amplifiers has been designed. Further the doctoral thesis deals with a frequency filter with the voltage conveyors design using signal flow graphs. Various graphs of the voltage conveyors comes from the various circuit analysis methods with non-regular active elements have been created. A basic graph of the voltage conveyor has been designed with help of a known controlled sources graphs. This graph have been used to design of multifunctional frequency filters, filters with high input and low output impedance and controlled frequency filters. A design procedure have been created so that in specific step of the frequency filter design the basic graph of the voltage conveyor could be extended to graph of any type of the voltage conveyor. Thereby a practical usage of various types of the voltage conveyors has been finding out. Further a new method of frequency filter design based on expanding of the signal flow has beenproposed.
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Frequency filters using voltage conveyors
Dohnal, Pavel ; Vrba, Kamil (referee) ; Minarčík, Martin (advisor)
The topic of this bachelor´s thesis was frequency filters and their realization using voltage conveyors. The main goal of my thesis was design and simulation of frequency filters with voltage conveyors through two different methods. At first there were found filters second order with voltage conveyors using autonomous circuits. These circuits resulted from total admitance net. Then the frequency filters using voltage conveyors were solve through synthetic components. At the beginnig of this project the frequency filters, their characteristics, realizations and types were defined. Then were designed basic properties of current conveyors, from which we can derive voltage conveyors. The voltage conveyors are basic building components of my thesis. There were defined individual types of voltage conveyors and their close specification. There was defined universal voltage conveyor. Through the universal voltage conveyor we can realize all types of voltage conveyors. After the definition of useful species there were designed the frequency filters second order using voltage conveyors with four passive components using the total admitance net. There were found 44 these circuits. Then one of these circuits was selected and this circuit was simulated to lowpass and hipass. Subsequently the other method was used, where were used the synthetic components to creation of filters secon order. The circuits resulted from autonomous circuits, which were produced by the first method. 25 of these autonomous circuits were usable for this method. One of these circuits was simulated to lowpass and hipass.
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