|
|
Study of moisture conditions in the facade wall after application of the ETICS
Ševčíků, Robin ; Steuer,, Radek (referee) ; Šťastník, Stanislav (advisor)
In the last decades the application of ETICS (external thermal insulation composite system) became a popular measure to improve the energy performance and the weather resistance of facades in the building stock. However, hand in hand with that the problem of microorganisms such as algae and fungi on facades has substantially increased in re-cent years. One of the main reasons is the interaction of climate influences with modern compositions of thermal insulation systems resulting besides of large thermal and mois-ture loads in occurrences of green covers of algae on facade surfaces. The algae popula-tion on facades with ETICS is supported by the sufficient humidity, caused by the night temperature decrease of surface to the dew-point temperature and by consequent con-densation of vapour. The thermal radiation against clear night sky is responsible for the origin of this periodically repeated phenomenon. This bachelor’s thesis is concentrated to the description of available knowledge in this field and explains the phenomenons by means of principles of building physics. Moreover, at the end, in the practical part, there are presented the results of author’s own measurements concerning determination of basic properties of commonly used fa-cade materials (spectral emissivity, absorbing power), important with regard to the sub-ject of the thesis.
|
|
|
New generation of biofuels
Pražák, Vojtěch ; Lisá, Hana (referee) ; Baláš, Marek (advisor)
This bachelor's thesis deals with different generations of biofuels. Their advantages and disadvantages and problems associated with their use in practice. The first part of the theses focuses on legislation and acquaintance with the issue of biofuels as a whole. The second part is focused on acquaintance and description of individual biofuels with examples of use in practice. At the end of the work there is an analysis of individual generations, representation in the fuel market and their efficiency.
|
|
|
The issue of biotic attack of ETICS
Těžká, Adéla ; Žák,, Antonín (referee) ; Žižková, Nikol (advisor)
This bachelor thesis deals with the issue of biotic attack of ETICS contact insulation systems. The theoretical part is focused on the individual components of ETICS, both from the point of view of materials and from the point of view of individual steps. In addition, there are organisms that cause biotic attack on facades. The practical part deals with the possibilities of testing the resistance of the surface treatment of ETICS against biotic attack, both in laboratory conditions and in the exterior.
|
|
|
Usage of flue gas as a source of CO2 for algae cultivation in bioreactors
Slonek, Jaroslav ; Juřena, Tomáš (referee) ; Brummer, Vladimír (advisor)
This master`s thesis is focused on possibility of use of flue gas as source of CO2 for algae cultivation in bioreactors. The first part of the master`s thesis is devoted to a qualitative and quantitative description of flue gas sources as CO2 source for algae cultivation. In the thesis industry sectors with the largest share of CO2 emissions on a global scale and in the Czech republic are summarized. On the basis of these data it was possible to determine cheap sources of CO2 for algae cultivation producing valuable biomass and other bio-products. The composition of flue gas from these sources was discussed in this section also with given expected outlook within the following years. The next part of the thesis is devoted to the influence of flue gas properties on algae cultivation. The impact of flue gas individual parameters on cell growth rate, quality and composition of biomass is described there. The description and design of the bioreactor is processed in the next part of the thesis. The experimental part of the thesis was performed on a bioreactor with similar properties. The next part of the thesis describes the effect of light on algae cultivation and the design of a regulation scheme for bioreactor light source. The experimental part of the thesis describes methods used to determine the concentrations of flue gas substances that could pass from flue gas into cultivation medium for algae cultivation to measure the changing composition of the flue gas in the closed experimental bioreactor system. The processed data from experimental measurements are presented and are discussed. The change in the composition of the culture medium for algae (without the presence of algae) due to flue gas aeration was monitored in the experimental part. It includes also the measurement of the change in the composition of the flue gas in time. All obtained and collected information are then summarized and discussed in the final part of the master`s thesis.
|
|
|
Photosynthetically produced hydrogen
Osipenko, Elena ; Němcová, Yvonne (advisor) ; Ráček, Jan (referee)
Bio-hydrogen from microalgae and cyanobacteria has attracted commercial awareness due to its potential as an alternative, reliable and renewable energy source. Photosynthetic hydrogen production from algae and cyanobacteria can be interesting and promising options for clean energy, because hydrogen is produced at ambient temperature and pressure and releases only water as a by-product. The energy of sunlight is used to split the water molecule into protons (H+), electrons (e-) and O2. The protons and electrons are then recombined with the help of the enzymes hydrogenase or nitrogenase (in the case of cyanobacteria) to form H2. Both of these enzymes are sensitive to O2 and therefore require the processes of H2 formation and CO2 fixation to be separated. This bachelor's thesis aims to describe the principle of H2 formation in different cyanobacterial and algal systems and mention the problems and limitations. The thesis also presents recent approaches, including genetic and metabolic engineering of cyanobacteria and algae or co-culturing of algae and bacteria, where an anaerobic environment is created by enhanced bacterial respiration.
|
|
|
Možnosti využití tuků při zpracování řas
Lučivňák, Roman
This work is a literature review and describes algae cultivation from available sources with a focus on closed cultivation systems. It is also dedicated to increasing the production of fats and their extraction from biomass. The entire thesis then focuses on the food use of these technologies and their products, and it also marginally describes the metabolism and basic taxonomy of algae.
|
|
|
Biotechnological potential of algae and cyanobacteria from low temperature environments
Faško, Adam ; Nedbalová, Linda (advisor) ; Vítová, Milada (referee)
With the interest in biofuels rising, public awareness of the biotechnological potential of algae and cyanobacteria has grown and there is discussion about other possible uses of these microorganisms. Algae and cyanobacteria from low temperature environments possess exceptional properties as part of their adaptation strategies. The aim of this work is to evaluate whether these properties can be exploited in biotechnology. In my theses, I focus on the three most frequently discussed areas of application of algae and cyanobacteria from cold environments: production of polyunsaturated fatty acids, dyes and antioxidants, and wastewater treatment. Based on the available literature, I concluded that algae and cyanobacteria from low temperature environments can outperform mesophilic species in terms of production of desired substances or nutrient uptake from the medium under certain conditions. Selection of suitable strains, optimization of culture conditions and application of metabolic engineering and synthetic biology will have a major impact on the utilization rate of these microorganisms.
|
|
| |
|
|
Všechno, co jste kdy chtěli vědět o řasách (ale báli jste se zeptat)
LEJSKOVÁ, Denisa
The bachelor thesis deals with the topics of teaching cyanobacteria and algae at secondary schools in the Czech Republic. The theoretical part of the thesis deals with the comparison of available information in curricular documents and the coverage of teaching the topic at high school. The practical part contains proposals for didactic materials. A study text, presentations for teachers and worksheets for practical teaching with elements of Inquiry-based learning (IBL) with methodical sheets were created.
|
|
|
Badatelsky orientovaná výuka k tématu sinic a řas
BŘEZINA, Petr
The thesis deals with subject of high school inquiry-based learning (IBL) with focus on phycology. A research of schools' lab equipment, feasibility of IBL and attitude of teachers towards this approach was made. Five inquiry-based exercises were assembled, along with methodical notes and suggestions for teachers. The issues with general phycology teaching and implementing IBL in Czech education system were discussed.
|
guest ::
