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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.
21

Složení a aktivita mikrobiálního společenstva během rozkladu rostlinného opadu na dvou kontrastních lokalitách / Composition and activity of microbial community during decomposition of plant litter on two contrasting localities

Burešová, Andrea January 2015 (has links)
Decomposition of organic matter in soil is influenced by abiotic and biotic factors and their role is different depending on site, organic substrate and its decomposition phase. Soil microbial community influences soil organic decomposition process in a different way, which is manifested, for example, by changes of microbial abundance and production of extracellular enzymes. The thesis aimed in determining relationship of two main soil microbial decomposers groups - fungi and actinobacteria in decomposition processes in situ. The impact of selected factors on decomposition processes were determined by experiment with litterbags, which were filled with litter of plant with different properties. Astragalus exscapus from the Fabaceae family contains high amounts of nitrogen in the tissues, Fagus sylvatica contains high amounts of carbon and lignin and Carex humilis has less carbon in the tissues than Fagus sylvatica falling in tissue element composition between Astragalus exscapus and Fagus sylvatica. Litterbags with three plant species were put under a litter layer at both contrasting sites. Litterbags and samples of soil were collected every two months during the years 2011-2012. Each litterbag was weighted, DNA was isolated from litter and soil samples and analyses of quantitative real time PCR...
22

Vliv sníženého odvodu tepla do chladící soustavy na parametry práce vznětového motoru

Mityska, Marcel January 1992 (has links)
No description available.
23

Antibakteriální povrchové úpravy nábytkových dílců

Frkalová, Veronika January 2015 (has links)
This thesis deals with the determination and evaluation of antibacterial properties of coatings and surface finishing. The thesis verified antibacterial, physico-mechanical and chemical properties of water-based coatings themselves with added antibacterial particles. For better orientation in issue of this thesis are generally described coatings, antibacterial substances and tested bacteria. The aim is to determine the effect on the properties of coatings with added antibacterial substances. How effective is the resistance of the tested coatings with added ingredients to the action of bacteria and fungi as well as to assess whether they are suitable for use in surface finishing furniture parts and whether they have the expected properties.
24

Povrchová úprava stolových desek s vyššími požadavky na odolnosti dokončených povrchů

Jarošová, Dagmar January 2018 (has links)
This diploma thesis deals with the topic of surface treatment of table tops in industrial production, specifically examines the influence of the rating film’s properties on its final resistence against the physico-mechanical and chemical factors. The underlying materials used are chipboards and in one case also bio-board. All samples were provided with one of three veneer types (oak, ash, walnut) and finished with transparent water-borne UV curable coatings. In some cases, the surface was treated with water-borne stains. The staining was done using HVLP spraying technology, the individual transparent lacquers were then sprayed with Airmix spraying technology. After curing and acclimatization, the surface of each sample was rewieved on the basis of its visual properties and physico-mechanical and chemical resistance. These properties were subsequently evaluated according to the relevant standards. The outcome is determination of the most suitable surface finish for table tops with high surface finish requirements.
25

Dynamika vybraných chemických vlastností povrchových horizontů Velkomeziříčska

Musilová, Martina January 2014 (has links)
This thesis is focused on the potencial (pH/KCl) and the actual (pH/H2O) soil reaction fluctuation and with humus content in 15 different areas in the region of Velkomeziříčsko. There were taken some samples to assess the pH and humus content for three times in the autumn during the years 2011, 2012 and 2013 as damaged from the surface mineral horizon. My work is also consisted with the basic information about the soil reaction, content of humus in the soil, it's determination and the methods of the measurement evaluating and rating. By measuring was found that the average content of humus of the interest area is around 3,7 %. These values correspond to strongly humic soils. The highest content of humus was recorded at forest sites. The average value of actual soil reaction is 6,7 for the field and meadow and 4,2 for the forest. The average value of potencial soil reaction is 5,5 for the field and meadow and 3,3 for the forest. According to the one-factor-analysis of variance there isn't any influence on the date but there is some influence on the location in the statistics of taking the samples to study the change of pH/H2O and pH/KCl. According to the one-factor-analysis of variance there isn't any influence on the date and on the location in the statistics of taking the samples to study the change of humus content.
26

Změny obsahu humusu a půdní reakce na vybraných lokalitách Moravského krasu

Boráková, Iveta January 2014 (has links)
This thesis deals with the content of soil organic matter and soil reaction to selected locations in protected landscape area Moravian karst. 30 lokalities was compared (10 arable land, 10 permanent grassland, 10 forest). Samples were taken from surface mineral horizon in 2011 and 2013. In the theoretical part is discussed the issue of soil organic matter and soil reaction. There is characterized area Moravian Karst. The practical part includes processing methods, results, evaluation, statistical and graphical processing. Average content of humus increases in the order: arable land < permanent grassland < forest. The values in 2013 were lower than in 2011. Soil reaction was in 2011 for arable land, permanent grassland and forest vegetation very similar. Soil reaction was in 2013 similar only with arable land and grassland, the forests were lower. The values in 2013 were lower than in 2011 In 2013, the soil reaction is similar only with cropland and grassland, the forests were lower. Based on analysis of variance (ANOVA: one factor) was shown influence the type of vegetation on humus content. Influence the type of vegetation on soil reaction wasn't shown. A statistically significant difference was demonstrated between the measured values of cnotent humus and soil reaction in 2011 and 2013.
27

Prodejnost sortimentu suchého zboží v shopu čerpací stanice pohoných hmot

Bašta, Petr January 2015 (has links)
The diploma thesis solves an important problem with the supply of fuel in the vicinity of the competitive environment. It was found that the biggest competitors of the subject are two fuel stations in the vicinity, although smaller in the scale of trading range sale, they must be regarded as competitors. Any failure causes the transfer of customers just to them. Analysis of the survey results showed that the proportion of the sales of dry goods to total sales in the years 2010 to 2014 was 13.22 percent on average. In the assortment of dry goods there was a significant increase in sales for vehicles and a reduction in other goods. Other products consists of the following specific items: toiletries, photoes, motorway tax stickers, batteries, telephone cards and coupons and others. The sale of fuel is significantly influenced by the price (for the period 2010-2014 change of 5.06 CZK per liter) and quantity (for the same period change of 28.41 percent). Due to the current low price of fuel and the assumption of relatively same level of sale prices it will be necessary to focus on improving the quality of services provided by employees of fuel station and expanding the trade range of additional sales for motorists.
28

Vliv dřeviny na kvalitu vybraných druhů povrchových úprav pro exteriér / Influence of kind of wood for quality of selected paints for exterior

Blažek, Tomáš January 2016 (has links)
The aim of the diploma thesis is to provide lay persons as well as specialists in the field with information about a suitable surface treatment method for various types of wood and about the impact of the choice of wood on the coating durability when used outdoors, so that they make a sound judgement upon these findings. The diploma theses is divided into several parts containing an introduction into the problem of degradation of wood used outdoors, a description of various coatings based on natural substances, various wood modifications, principles of applying the coatings, norms providing for applying the coatings. On the basis of the tests using accelerated aging it has been found that the best results had oak with chemical modification Lignofix I-profi and final surface finish with the application of outdoor oil. The aim of the thesis is to compare selected coatings based on natural substances on selected types of modified wood. Outputs of particular tests are clearly arranged to provide a clear overview of particular measurement data. The diploma thesis also includes a clear analysis of particular coating materials with respect to their acquisition costs compared to their degradation and their utility.
29

Povrchová úprava nábytkových dílců z MDF pigmentovanými vodou ředitelnými nátěrovými hmotami

Laga, Petr January 2011 (has links)
No description available.
30

Historické povrchové úpravy dřeva v kombinaci se současnými nátěrovými hmotami

Šťastný, Pavel January 2011 (has links)
No description available.

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