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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Vliv sorbentů na retenční čáru kontaminované nivní půdy / Influence of sorbents on retention curve of contaminated fluvisol

Hnatajková, Eva January 2017 (has links)
The thesis deals with the influence of sorbents on the retention curve of the contaminated alluvial soil (fluvisol). The retention curves of soil without sorbents (reference soil) are compared with the soils enriched by the following sorbents. Biochar (BC), amorphous manganese oxide (AMO) and combination of (AMO + BC). Soils sample were collected is specific uncultivated area in the valley of Litavka river (located in the central part of the Czech republic). Two different types of samples were used for measurement of retention curves. First type of the samples were collected from the column experiments and second type were the samples collected in the field. All samples were extracted using in Kopecky rings (100 cm3). The measurement of the retention curves was performed by a direct method in the laboratory. For laboratory determination of the retention curves classical set of instruments were used (sandbox, sand-kaolin box and pressure apparatuses). The measured data were fitted using van Genuchten. Values compared are the bulk density, parameters of van Genuchten model (Thétas, ThétaR, Alfa, n), and values pF (0; 1.0; 2.0; 2.7; 3.0; 3.7; 4.18). The comparison of retention curves of differently treated soil was based on the average, standard deviation and the difference and ratio of the avarages. According to presented findings sorbents affected shapes of the retention curves. Especially biochar influence water content for high pF values. We confirmed the hypothesis according to VERHEIJEN et al. (2010), that biochar tincrase the total retention of soil water, but does not increase the amoust of water avaible plants. The influence of AMO on retention curve was negligible. Therefore sorbent AMO has a small influence on change of water retention in the tested soil. The effect of combined sorbent (AMO + BC) on the retention more significant than effect of using AMO sorbent only. This combination of sorbents affects the water retention depending on applied pF.
52

Produkce skleníkových plynů u vybraných druhů jedlého hmyzu

Kouřil, Petr January 2016 (has links)
The aim of this diploma thesis was to gather available information relating to the produ-ction of greenhouse gases from edible insects, and impact of these gases on living orga-nisms and the environment. The practical part of this study was to measure the production of greenhouse gases for selected species of edible insects. During this measurement, it was found that the produ-ction of greenhouse gases in the edible insects compared with livestock almost compa-rable. Another part of the experiment was to compare the production between the rich and the hungry insects. In this comparison, some groups found statistically significant differen-ces. This information is important for starvation of edible insects in front of kitchen preparation. Based on the obtained values can recommend a factory farm edible insects.
53

Sledování sloučenin vázajících oxid siřičitý ve víně

Herzán, Jakub January 2016 (has links)
The diploma thesis deals with observation of development of compounds that are able to bind sulfur dioxide. These are carbonyl compounds that are mostly product of yeast and bacteria metabolism. Theoretical part deals with sulfur dioxide, its characteristics and forms that are present in wine and it also deals with compounds that bind the sulfur dioxide. The diploma thesis also analyzes technology of production of wine by Sur-lie method and malolactic fermentation that enable reduction of SO2 in wine to the minimum value. The subject of research was to produce six types of wine from the same raw material with graduaded total dosage of sulfur dioxide. The experiment took six months during which was accomplished grapes processing, fermentation, three-month wine aging in stainless steel tanks, wine preparation for bottling, bottling and one-month aging in bottles. Throughout the whole experiment periodical samplings, evaluation of volume of carbonyl compounds and evaluation of individual forms of sulfur dioxide were realized. Basic analytical parametres of wines were determined and the wine was sensory evaluated.
54

Vliv macerace rmutu pří výrobě rosé vín

Vrbová, Libuše January 2016 (has links)
This thesis deals with the influence of maceration of the mash in rosé winemaking. The literary section describe the phenolic compounds contained in grapes, the possibility of producing rosé wines and factors affecting the course of maceration. The aim of the work was to determine what type of maceration is the most suitable for the production of rosé wines. For the observed samples were examined maceration time and the influence of sulfur dioxide. He evaluated the sensory profile of wines colourists range using the CIE L * a * b * and the content of phenolic compounds. The experiment was conducted at the blue grape variety 'Pinot Noir'. Of ground grapes were created two variants. Mash without addition of SO2 and mash with the addition of sulfur dioxide. For each variant was produced six rosé wines with different length of maceration of the mash. Desired time maceration were 0, 5, 10, 15, 20 and 25 hours. Found mash conducted in non-inert conditions at 13 ° C. The results implies that the best time maceration for the production of rosé wines from varieties 'Pinot Noir' is 15 hours with the use of sulfur dioxide.
55

Vliv oxidu siřičitého na vybrané kvalitatívní parametry vína

Varmuža, Radek January 2016 (has links)
This thesis dealing with The influence of sulfur dioxide on on qualitative parameters of the wines was developer between 2014/2016 at the Department of Post Harvest Technology of Horticultural Products, Faculty of Horticulture, Mendel University in Brno. In this thesis was studied influence of sulfur dioxide on total polyphenols, which was measured by Folin-Ciocalteu and antioxidant capacity, which was measured by FRAP and DPPH. For this experiment were chosen two wines. The white wine was Rulandské bílé and the red wine was Svatovavřinecké. Doses of sulfur dioxide were applied at 0 mg/l, 25 mg/l, 50 mg/l, 75 mg/l, 100 mg/l. These doses are used in winemaking. Was found, that sulfur dioxide added to wine influence measured values of polyphenols and antioxidant capacity measured by FRAP and DPPH. Also was found, that system FRAP is more affected by sulfur dioxide, than system DPPH.
56

Akutní a chronická onemocnění plic a dýchacích cest u dětí: nové bioindikátory a molekulární cíle pro farmakoterapii / Acute and chronic airways disease in children: new bioindicators and molecular targets for therapy

Šenkeřík, Marian January 2017 (has links)
The aim of this thesis was to contribute to the standardization and validation of expiratory flow parameters independent of NO testing, particularly alveolar concentration (CANO) and bronchial NO flux (JawNO) in children and adolescents with allergic respiratory diseases. The thesis was created in the time of increased interest of medicine professionals in non-invasive examination methods and targeted therapeutic influence of inflammation in small airways in asthmatics. After the standardization and validation of clinical benefits, the measurement of concentrations of nitric oxide (FENO) in the air exhaled through the mouth with the speed of 50 ml/s was validated for the evaluation of eosinophilic airway inflammation in patients with asthma and started to be widely used in clinical practice. Currently, there is an ongoing research focused on a new method for FENO measurement at several flow rates, which uses physiological models of NO transfer in exhaled air, allowing to quantify the amount of NO in an indirect way and to monitor the intensity of the inflammatory processes in distal and proximal airways non- invasively. In groups of children and adolescents with allergic rhinitis and / or bronchial asthma and their healthy peers (aged 6 -19 years), the concentration of FENO was examined using online...
57

Studium asimilačních charakteristik rostlin se zaměřením na srovnání jejich odezvy v ustáleném a dynamickém růstovém prostředí

Holišová, Petra January 2013 (has links)
No description available.
58

Zplyňování biomasy v atmosféře se zvýšeným obsahem oxidu uhličitého / Biomass gasification with carbon dioxide

Budai, Karel January 2019 (has links)
This diploma thesis deals with the use of CO2 in gasification of biomass. The theoretical part is focus on description of gasification process and gasification reactors. The next part descripes the influence of the gasifitation medium composition on the properties of the generated gas. The experimental part is devoted to gasification of biomass on a fluidized bed generator, where the effect of CO2 concetration in the gasification medium on the properties of the generated gas is investigated. In the final part is the evaluation of the results.
59

Fotokatalytická aktivita tištěných vrstev oxidu titaničitého / Photocatalytic Activity of Titanium Dioxide Printed Layers

Novotná, Michaela January 2009 (has links)
This diploma thesis was focused on the preparation of self-cleaning and photocatalyticaly active titanium dioxide thin films. Transparent and porous thin layers of titanium dioxide were prepared from sol-gel containing titanium tetraisopropoxide (TTIP) as precursor with addition polyethylene glycol (PEG). Transparent thin layers of titanium dioxide were also prepared from colloidal solution titanium dioxide. The immobilization of thin titanium dioxide layers was performed by a sol-gel process on the soda lime glasses. Diffusion of sodium cation from soda lime glasses into titanium dioxide layer were blocked. Sol was deposited by printig method – micropiezo deposition. Sol and thin titanium dioxide layers were characterised by the physical-chemical method. For prepared sol viscosity, density and surface tension were measured. Thickness and hydrophilicity of titanium dioxide layers also were studied. The photocatalytic activity of the printed titanium layers were tested via the photocatalytic degradation of the 2,6-dichlorindophenol. The influence of addition PEG into the sol and influence of sol loading was studied. It was found that the addition of PEG into the sol significantly increased the photocatalytic activity of titanium dioxide layers.
60

Trvanlivost a sanace vnějších tepelně izolačních kompozitních systémů / DURABILITY AND MAINTENANCE OF EXTERNAL THERMAL INSULATION COMPOSITE SYSTEMS

Remeš, Hynek Unknown Date (has links)
External thermal insulation composite system (ETICS) is a widespread method appearance of the facades of existing and new civil and industrial buildings. With its frequent application becomes engaged his durability issues and possible rehabilitation and more topical. Influences affecting durability ETICS is still under investigation, as well as systematic and practical way to usable redevelopment. The main theme of this work is to summarize knowledge in ETICS issue, particularly from the viewpoint adhesive and leveling materials based on Portland cement and final finishes. The theoretical part is discussed ETICS composition, the composition of its components, technical requirements and factors affecting durability. The experimental part focuses on the redevelopment of ETICS and verification using colloidal silica for modification of construction materials, which are part of the ETICS.

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