National Repository of Grey Literature 37 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Short-term rainfall for hydrological modeling and design of small water management structures in the landscape
Kavka, P. ; Müller, Miloslav ; Strouhal, L. ; Kašpar, Marek ; Bližňák, Vojtěch ; Landa, M. ; Weyskrabová, L. ; Pavel, M. ; Dostál, T.
The aim of this methodology is to reduce the current knowledge deficit in the field of short-term rainfall variability and its application in hydrological modeling and design of small water structures and conservation measures within the catchment. The methodology defines six generalized short-term rainfall scenarios with specific temporal distribution of rainfall intensity. Next their variability related to their occurence frequency and spatial distribution accross Czech Republic is presented. These scenarios were derived from the 10-years time series of radar rainfall measurements adjusted with the daily totals from ground gauging network.
Influence of the new foundation on the construction of the wine cellar
Dostál, Tomáš ; Závacký, Martin (referee) ; Horák, Vladislav (advisor)
In the traditional wine village Dolni Bojanovice was a two-party dispute. The dispute arose because of the fear of a negative impact on the existing structure of the wine cellar because of the load of a newly built hall. The bachelor thesis is focused on the evaluation of the likely influence of the base of the new structure on the historical wine cellar.
Výživa cukrovky při nedostatku hořčíku v půdě
Dostal, Tadeáš
The goal of this project was to compare the different compounds of magnesium and its influence on yield and volume of sugar beet. This project was realized by small plot experiment in Pusté Jakartice u Opavy. Sugar beet was fertilizated using four different experiment setups: 1. not fertilized, 2. DUMAG (ammonium nitrate + magnesium nitra-te), 3. DASAMAG (ammonium nitrate + ammonium sulphate with magnesite), 4. MAGNISUL (ammonium nitrate + ammonium sulphate with kieserite). Variety with fertilizer DASAMAG has the highest yield of sugar beet. The highest digestion of sugar beet has non-fertilizated variety and variety with fertilizer DUMAG.
Spatial interpolation and soil erosion modeling
Bek, Stanislav ; Ježek, Josef (advisor) ; Segeth, Karel (referee) ; Dostál, Tomáš (referee)
The doctoral thesis deals with selected methods of spatial interpolation and their applications to numerical modeling of the earth's surface, in particular soil erosion. The first part contains the description of the studied methods. Firstly and foremost, the method called regularized spline with tension (RST) is introduced. It has proven to be useful in interpolating elevation data. In the thesis, RST is presented in depth with the derivation of its radial basis function and its links to kriging. Further on the mathematics of digital terrain models and the tools for terrain geometric analysis are covered. The following chapter deals with the description of the soil erosion process and of the selected erosion models. The second part of the thesis summarizes five of the author's research articles which include applications of the described mathematical methods. The first two articles are devoted to the problem of elevation data interpolation and the building of digital elevation models. They deal with the optimization of the RST method for particular input data and target erosion models. The third article analysis the spatial structure of the soil data and the pedogenesis of the Žofínský prales natural forest. The last two articles deal with the spatial properties of heavy rainfalls and the mapping of...
Fully-Differential Frequency Filters with Modern Active Elements
Langhammer, Lukáš ; Dostál, Tomáš (referee) ; Štork, Milan (referee) ; Jeřábek, Jan (advisor)
Tato disertační práce se zaměřuje na výzkum v oblasti frekvenčních filtrů. Hlavním cílem je navrhnout a analyzovat plně diferenční kmitočtové filtry pracující v proudovém módu a využívající moderní aktivní prvky. Prezentované filtry jsou navrženy za použití proudových sledovačů, operačních transkonduktančních zesilovačů, plně diferenčních proudových zesilovačů a transrezistančních zesilovačů. Návrh se zaměřuje na možnost řídit některý z typických parametrů filtru pomocí řiditelných aktivních prvků, které jsou vhodně umístněny do obvodové struktury. Jednotlivé prezentované filtry jsou navrženy v nediferenční a diferenční verzi. Velký důraz je věnován srovnání plně diferenčních struktur s jejich odpovídajícími nediferenčními formami. Funkčnost jednotlivých návrhů je ověřena simulacemi a v některých případech i experimentálním měřením.
Filtering structures for fotovoltaic power stations
Hruška, Petr ; Dostál, Tomáš (referee) ; Petržela, Jiří (advisor)
This thesis is dedicated to an issue of vibration of photovoltaic panels, which manifests itself primarily in the acoustic field. From the photoelectric effect is gradually getting through photovoltaic cell, panel, string, power plant to define the causes of the vibration. The aim of the work is to design electrical low pass filter that suppress disruptive elements, which prevents audible vibrations of panels and the whole system of photovoltaic power plants.
Class D stereo audio power amplifier
Kazelle, Kamil ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
The content of this project is design of stereo audio amlifier working in class D with output power 2x20W. Project includes also a design of preamplifier and power supply. This project is divided into the four parts. In first part the theory and problems of amplifiers working in class D is resumed, in the second the designed circuits are dicussed, in the third the results of simulations in the program PSpice are presented and the last part of project describes the realization and presents the results of measurements.
Application of the syntetic blocks in the electronic circuit synthesis
Labudík, Marek ; Dostál, Tomáš (referee) ; Petržela, Jiří (advisor)
n project is investigated synthetic coils and FDNR, circuits are first simulated in a snap, which I obtained the graph of the input impedance at the frequency and formula to calculate the impedance. The results of this simulation were used for the simulation program PSPICE, the districts where I was compared with the equivalent circuit, which I design on the formula of the snap. Some of the investigated synthetic and FNDR coils were then used for simulation of the oscillators.
Active Frequency Filters for Higher Frequencies
Fröhlich, Lubomír ; Dostál, Tomáš (referee) ; Biolek, Dalibor (referee) ; Sedláček, Jiří (advisor)
This thesis deals with the synthesis and optimization of frequency analogue filters with modern active elements usable for higher frequencies. The thesis is divided into three parts, the first part deals with the problematic concerning Leap-Frog combined ARC structure. Due to a difficult design, this method is not described in a detail and used in practice, although it shows e.g. low sensitivity. Firstly, a complete analysis of individual filters was made (for and T endings) and consequently these findings were used during implementation of this method to NAF program. Finally, samples of real filters were realized (for verification of functioning and correct design). Another very interesting topic concerning filters is usage of coupled band-pass for small bandwidth, where it is necessary to solve the problems concerning ratio of building elements values, but also price, quality, size of coils, sensitivity, Q factors, coefficients etc. That is why in practice a coil is very often substituted with other equivalent lossy and lossless blocks which create ARC filters structure. The design and the possibility of usage of lossy grounded elements were described here (such as synthetic inductors, frequency dependent negative resistor). Some parts of the design are individual computer sensitivity analysis, setting of usage and quality comparison of individual lossy grounded blocks. Besides, a program for these elements was created, it is useful for a quick design and depiction of transfer characteristics. The third part deals with the usage of tuning universal filters consisting three or more operational amplifiers, which secures its universality and possibility to create different kinds of transfer characteristic. In practice, Akerberg - Mossberg and Kerwin - Huelsman - Newcomb are the most used types of filters. These were also compared with less common universal filters. In the end, the possibility of digital tuning of universal filter with the help of digital potentiometers for filters of 10th order and frequency around 1 MHz was shown.
Current Feedback Circuits for Analog Signal Processing
Stehlík, Jiří ; Bartoň,, Zdeněk (referee) ; Dostál, Tomáš (referee) ; Musil, Vladislav (advisor)
This dissertation thesis deals with design of new functional blocks usable in area of analogue signal processing, focusing on sensor signal processing. Versatility of these circuits will find applications in programmable analogue array structures that will be possible to control and configure via a digital signal. Hereby build-up array would be fully a reconfigurable digital control system for sensor signal processing and usable for a wide range of different sensors. It offers possibility to build-up a control code for each specific sensor system, with which it would be possible to achieve optimal results of the entire system and consequently place the system on a chip. The presented programmable array is designed from configurable analogue blocks. The current feedback circuits, which in a suitable configuration can operate in voltage or current mode, are used here. This allows to achieve very good results in the systems with very low power supply, which is closely associated with mobility and autonomous behavioral (that are very important and observed parameters today) of the entire sensor-based framework. The work deals in detail with particular blocks, which are described theoretically and evaluated for using in the programmable analogue array. Design of the structure of programmable analogue array as well the use of these circuits in the part of whole system (that will be realized on a chip) are presented at the end of this thesis.

National Repository of Grey Literature : 37 records found   1 - 10nextend  jump to record:
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1 Dostal, Tadeáš
9 Dostál, Tomáš
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