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Production concept of wall mounting bracket
Tesař, Michal ; Štroner, Marek (referee) ; Císařová, Michaela (advisor)
The thesis deals with the solution of the design of the production of a holder for compact switchgear cabinets. The production series was set at 400,000 pcs/year. The part will be made from DC01 steel with a thickness of 2 mm. The equivalent is steel 11 321. Of the possible production variants, the technology of the progressive forming tool was chosen. The arrangement of the blank on the sheet metal strip is a two-row layout, where two components will be produced at once. A coil of sheet metal with exact dimensions was chosen as the semifinished product. The material utilization coefficient is 80.18 %. The part is manufactured in 8 steps and the necessary technological and structural calculations were made for this variant. The total force to produce the part is 1,240 kN. The machine selected is an eccentric crank press from the company Formetal s.r.o., with the designation CC 160. After the actual production, the components will still be galvanized.
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Design of Web Aplication for bond Management
Půža, Lumír ; Tesař, Miroslav (referee) ; Dydowicz, Petr (advisor)
This thesis deals with the design of a web application for bond management. The thesis has three main chapters. The first chapter describes the theoretical background required for the analysis, the implementation of the change and the development of the web application. In the second chapter, the company's analysis and the current state of bond management. The last part of the thesis is the design of the change, the creation of the application and its deployment. The result is the successful deployment of the web application.
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State of the art on lightning activity induced by volcanism
Tesař, Matouš ; Popová, Jana (advisor) ; Křížek, Marek (referee)
The thesis presents a state of the art of existing knowledge and findings related to the lightning inducted by volcanic activity. First the thesis briefly characterizes lightning which occurs in thunderstorms. The chapter also presents mechanisms of lightning occurrence and methods of lightning detection. The main part of the thesis contains a literature review on the characteristics of lightning which occurs in relation to volcanic activity. It also provides classification of volcanic lightning and mechanisms of its occurrence. Furthermore, the chapter describes methods which are used to detect volcanic lightning. It also contents methods of investigation of volcanic lightning and laboratory experiments, which aim at deepening theknowledge on this phenomenon. Moreover, the chapter also provides a brief outline of expected future research on volcanic lightning. The thesis presents several ways by which volcanic lightning affects the Earth's atmosphere and surface, and the affected volcanic ash particles. Based on findings provided by the literature, the thesis discusses and compares lightning produced during in thunderstorms with volcanic lightning. Key words: lightning, volcanism, state of the art, detection
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Time variabilty of soil hydraulic properties and their impact on soil moisture estimation
Šípek, Václav ; Vlček, Lukáš ; Tesař, Miroslav ; Zelíková, Nikol ; Hnilica, Jan
The study was focused on the temporal variability of saturated hydraulic conductivity in an experimental plot covered by spruce forest and investigated benefits of its incorporation into soil water balance model. The results showed that the higher saturated hydraulic conductivity (33.6-44.8 cm hr-1) was observed in summer period compared to lower values (13.2-22.3 cm hr-1) in the winter period. The use of seasonally variabile saturated hydraulic conductivity improved the efficiency of soil water balance model in terms of lower root mean square error between observed and simulated volumetric soil water content by 33.2 %. The Nash-Sutcliffe coefficient rose from 0.34 to 0.68.
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Hydrology of small basins 2023
Hnilicová, Soňa ; Tesař, Miroslav
The book is a collection of scientific contributions to the Conference "Hydrology of small basins". The conference topics were: 1. Changes in the regime of water resources in small basins; 2. Complex monitoring a and water storage balance in small basins; 3. Hydrological extremes (flash floods, drought); 4. Effect of land use and land cover on water balance; 5. Hydrophobicity and transportation processes in soil; 6. Hydrological modelling und uncertainties; 7. Biogeochemical fluxes in a small watershed and eutrophication of surface waters; 8. Mountainous experimental small basins (deposited precipitation, snow regime, …); 9. New methods, techniques and instrumentation in hydrology and hydroecology.\n
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Character of groundwater flow in highly permeable sediments of Bohemian Cretaceous Basin
Kůrková, Iva ; Bruthans, Jiří (advisor) ; Datel, Josef (referee) ; Tesař, Miroslav (referee)
The study focuses on water flow in sandstones and sandy limestones of the so-called facies transition in the western part of the Bohemian Cretaceous Basin. The area between Turnov, Milovice, Úštěk and Doksy is a part of most important aquifer in the Czech Republic, in terms of water supply. However, there are considerable discrepancies in hydrogeological concepts regarding groundwater flow in this area. The prevailing opinion is that quartz sandstones form the main aquifer, although largest springs are partly located outside the area of their occurrence. The aim of the work is therefore to determine which rocks are the source of the large springs and where diffused seepage predominate. Furthermore, to characterize the possibility of rock karstification, to describe the character of the channels and the flow in them, and at the same time to compare it with the flow in the adjacent porous environment in selected areas. Thermometry (winter profiling of temperature and conductivity along watercourses) was carried out in order to distinguish areas with large springs, diffused seepage and stream segments without any drainage. The karst potential of rocks was determined using calcimetry and adopted leaching tests. To determine flow velocity in karst channels and to characterize the channels, a series of...
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Amount and differences in snow accumulation in the Šumava region
Procházka, J. ; Šustková, V. ; Tesař, Miroslav
The Šumava Mts. (Bohemian Forest) represents the most extensive mountainous range of the Czech Republic and due to its area and altitude it catches the substantial portion of the winter precipitation in the snow form. Unfortunately, the more continuous information on snow characteristics from the highest and remote regions of the Šumava Mts. has been in effect missing till recently. From this reason the activities focused on the more detailed expeditionary field measurements of the snow depths and snow water equivalent. The space analysis of point snow cover measurements the appropriate tools were used: ArcGIS (ESRI), orographical interpolation, LLR methods and the methods of ClidatDEM used in the Czech Hydrometeolological Institute.
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Changes in the ratio between a new snow depth and seasonal precipitation in mountainous and submontane regions of the Czech Republic
Procházka, J. ; Lipina, P. ; Šustková, V. ; Tesař, Miroslav
Snowfall and snow cover formation is an important aspect of the colder part of the year in the Czech Republic and Central Europe. Snow cover is important from the point of view of climatology, hydrology, ecology and recreation, and therefore economic. In addition to precipitation, the amount of new snow depends mainly on the air temperature. With gradual warming, it can be assumed that with a similar total precipitation, the proportion of precipitation in the form of snow and the ability to form snow cover will decrease. In order to evaluate the mentioned changes, the ratio of the seasonal amount of new snow in cm and total precipitation in mm, Sn/P (cm/mm) was used in this paper. For the analysis, data from the CHMI database for two normal periods 1961–1990 and 1991–2020 were processed for selected mountain and foothill meteorological stations in the Czech Republic. The period from November to April was assessed as a cold part of the year for this purpose, when a new snow cover is more likely to form. The results of the study showed that the Sn/P ratio decreased in the period 1991–2020 compared to the period 1961–1990.
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Vliv vybraného preparátu k synchronizaci říje na reprodukci prasniček
TESAŘ, Martin
The aim of this master thesis was to evaluate reproduction traits of gilts and sows and assess influence of selected preparation for estrus synchronisation on reproduction of gilts. There were 2 593 sows and 729 gilts in the test. There were evaluated data of reproduction performance of gilts both treated and not treated by Altresyn? with active ingredient altrenogest. Gilts from the experimental group were given altrenogest (20 mg) for the period of 18 days as a method for estrus synchronization. Total number of 528 synchronized gilts (95.3%) showed signs of estrus. 91.5% of treated gilts were inseminated 5th to 7th day after finishing the altrenogest application. The conception rate in year 2018 at mating without the estrus synchronisation was 81.2% and the farrowing rate 77.1%. The selected farm started using Altresyn? in year 2019. The conception rate went up to 81.8 % and farrowing rate to 78.2 %. (These figures were from January to November). The treated gilts gave birth to 0.19 total born piglets more (13.09 piglets vs. 12.90 piglets) and 0.23 live born piglets more piglets (12.25 piglets vs. 12.02 piglets) than to gilts that were not treated by altrenogest. The highest number of total born piglets (13.3 piglets) was at gilts that were inseminated in the age of 250-259 days and 280-289 days. The gilts that were not treated by Altresyn? were first mated earlier (252.5 days) than gilts treated by Altresyn? (254.7 days).
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