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Formula Car Braking System Design
Dobrovolný, Petr ; Beran, Martin (referee) ; Ramík, Pavel (advisor)
Design of braking system for the formula student car. Calculation of basic forces acting in the braking system, including the design of hydraulic circuits. Mechanical analysis of the most important parts of the braking system and pedal assembly. Thermal analysis of the brake discs. Manufacturing and total cost calculation.
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Udržitelné stavění cestou recyklace
Dobrovolný, Petr
Building industry´s high demands of energy and raw materials lead to a number of negative impacts on the environment and economy Considering the needs of sustainability, it is desirable to reduce the raw materials consumption and waste production. Using the principles of recycling and reuse of building materials can provide effective tools for achieving the goals.
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Recycling-Aware Building Design
Dobrovolný, Petr
The paper focuses on recycling in the building industry, placing emphasis on load-bearing building structures. Current practice is taken as the starting point, namely the processes of demolition, material separation and further processing. Based on collected data, the paper determines the key principles for good building design that takes into account future recycling.
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Possibilities of using recycled glass for the preparation of blended cements
Dobrovolný, Petr ; Všianský,, Dalibor (referee) ; Dvořák, Karel (advisor)
This work focuses on the possibility of using recycled glass in the manufacture of blended portland cements. It examines the possibilities to improve pozzolanic properties of recycled glass with new milling processes, the formation of agglomerates material during the course of grinding and their subsequent effect on the hydration process of binders. It is also the optimization of the grinding process with respect to the wear of grinding bodies, grinding energy consumption and maximize the performance of the mill.
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Interned based measurement system
Dobrovolný, Petr ; Kozák, Tomáš (referee) ; Zezulka, František (advisor)
The work is deal with the measuration and distribution of data using microcontroller ATmega64. The measuring system connect is done by Ethernet controller ENC28J60 in communication networks. Communication protocols TCP / IP are taken advantage of transfer data to user. Data view is dealt with the HTTP protocol through the use of HTML code. Web browser are used for disclosure of information. Web page uploading can be replenish with current analogue and digital values using the tags created for this measuring system.
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Internet based control of laboratory models
Dobrovolný, Petr ; Smrčka, František (referee) ; Zezulka, František (advisor)
This award solves design of two models that are designed to teach on PLC and in the future on the Control Web. Both models should be used in LabLink system, which allows you to remotely working on laboratory tasks. The first software model simulates the movement of trains on rail in relation on control from the PLC. The second model is a physical model of drill. In both models are solid managing and type of construction, which allows operation without physical intervention.
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Drivers of soil moisture trends in the Czech Republic between 1961 and 2012
Trnka, Miroslav ; Brázdil, Rudolf ; Balek, J. ; Semerádová, Daniela ; Hlavinka, Petr ; Možný, M. ; Štěpánek, Petr ; Dobrovolný, Petr ; Zahradníček, Pavel ; Dubrovský, Martin ; Eitzinger, Josef ; Fuchs, B. ; Svoboda, M. ; Hayes, M. ; Žalud, Zdeněk
Soil moisture dynamics and their temporal trends in the Czech Republic are forced by various drivers. Our analysis of temporal trends indicates that shifts in drought severity between 1961 and 2012 and especially in the April, May, and June period, which displayed such results as a 50% increase in drought probability during 1961–1980 in comparison to 2001–2012. We found that increased global radiation and air temperature together with decreased relative humidity (all statistically significant at p < 0.05) led to increases in the reference evapotranspiration in all months of the growing season; this trend was particularly evident in April, May, and August, when more than 80% of the territory displayed an increased demand for soil water. These changes, in combination with the earlier end of snow cover and the earlier start of the growing season (up to 20 days in some regions), led to increased actual evapotranspiration at the start of the growing season that tended to deplete the soil moisture earlier, leaving the soil more exposed to the impacts of rainfall variability. These results support concerns related to the potentially increased severity of drought events in Central Europe. The reported trend patterns are of particular importance with respect to expected climate change, given the robustness and consistency of the trends shown and the fact that they can be aligned with the existing climate model projections. Introduction
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The rescue of critically endangered fish species through manipulation with spermatogonia and oogonia
DOBROVOLNÝ, Petr
The transplant experiments described in this work may help to shorten the generation interval for long maturing endangered fish species and their more effective reproduction. Further, it is possible to preserve the separated spermatogonia and oogonia using a cryopreservation in liquid nitrogen. We conserve both paternal and maternal DNA and the gene pool of endangered fish species will not be depleted of maternal part. It's because we can freeze only sperm in the preservation of mature gametes. Fish eggs and embryos would not survive freezing. The described methods will be applied in the future to more effective rescue of critically endangered sturgeons by the transplantation of their germ cells into a Sterlet (Acipenser ruthenus). These methods can be suitable for application on other species of endangered fish in case of finding an appropriate recipient. As an example of our fish species is a European eel (Anguilla Anguilla). The Siberian sturgeon (Acipenser baeri) and the Sterlet (Acipenser ruthenus) were used as model organisms. For Siberian sturgeon the enzymatic dissociation technique, sorting of germ cells using Percoll gradient concentration and transplantation of sturgeon spermatogonia and oogonia were used. The results showed that the use of 0.3% of trypsin in PBS is optimal for dissociation of spermatogonia and oogonia, because this medium was dissociating the highest number of cells without reducing their viability. The separation of the early stages of germ cells has been successfully achieved by segregation in 10 to 30% of Percoll gradient with the help of centrifugation. After transplantation it was proved in spermatogonia as well in oogonia that they colonized the genital ridges of the host. The recipient became a chimera of a germ line, which can produce donor gametes throughout his life.
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