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Personal exposure measurement during dental nanocomposite grinding
Ždímal, Vladimír ; Ondráčková, Lucie ; Ondráček, Jakub ; Schwarz, Jaroslav ; Bradna, P. ; Roubíčková, A. ; Pelclová, D. ; Rössnerová, Andrea
The purpose of this study was to measure the personal exposure of each participant of the study and to compare the results with those of static monitoring. Personal nanoparticle sam-plers (PENS), which can simultaneously detect both nanoparticles (PM0.1) and respirable parti-cles (PMA), were used to determine personal exposure (Tsai et al., 2012). Area monitoring in-cluded measurement of mass concentrations using the Berner Low Pressure Impactor (BLPI 25/0.018 /2, Hauke GmbH, Gmunden, Austria) and the Low Volume Sampler (LV5, Sven Leckel Ingenieurbüro GmbH, Germany). The number concentrations and their size distributions were measured with the Scanning Mobility Particle Sizer (5MP5 3936, T5I Inc., USA) and the Aerody-namic Particle Sizer (APS 3321, TSI Inc., USA). Measurements with all of the above- mentioned instruments were performed in four shifts with six participants per shift. Each participant milled for 10 minutes and then remained in the room until the group finished the session, so the total exposure lasted about 70 minutes. Due to the high content of filler nanoparticles, the nanocom-posite Filtek Ultimate (body A2, 3M ESPE, USA) was selected for these measurements.
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Combining bracketed pictures
Roubíčková, Anna ; Holub, Viliam (advisor) ; Adámek, Jiří (referee)
In real-life scenes, the light dynamic range is often larger than a digital camera is able to capture. This problem is addressed by exposure bracketing, i.e. the same scene is captured several times with different exposures. This work presents ImageLighter, a program designed for automatic blending of series of bracketed pictures in order to restore the original dynamic range. The algorithm is designed to use as much visual information as possible while blending. The resulting picture then reflects light levels of the original scene more accurately. The thesis describes algorithms and data structures used. A comparison to other known approaches is presented as well.
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Various methods of soil transfer and inoculation in restoration ecology
Hurychová, Hana ; Frouz, Jan (advisor) ; Roubíčková, Alena (referee)
Soil translocation is a method used in restoration ecology to either salvage habitats threatened by human activity or to restore disturbed habitats. There are various factors affecting the success rate of translocation operations which include the proper selection of a receptor site, method of soil manipulation, soil stockpiling and adequate aftercare. Different methods of soil stripping distinct in their success rates and application for use in habitat restoration, mainly in regards to their effect on the resultant community composition and financial costs. Translocations can result in decrease of biodiversity, but may be a viable option for locations of high conservation value where conservation in situ is not possible, allowing for quick restoration of mature ecosystems. Thorough surveys prior to and after the operation and sufficient allocation of resources are a key factor for successful translocation of soils and the associated biota. Additional research in the fields of invasions, comparison of methods and data analysis of translocation projects may improve the utilization of this technique in the future.
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Interactions of herbivore funtion gourps and Succisa pratensis
Šulcová, Hana ; Janovský, Zdeněk (advisor) ; Roubíčková, Alena (referee)
Herbivory is one of most important factors which form meadow ecosystems. These ecological communities have one of the biggest variety of species in Central Europe and their research is important in terms of management of protected species as well. Localities which has a similar importance, is also a meadow ecosystem with occurrence of Succisa pratensis, the only host plant for rare butterfly Euphydryas aurinia. Research of Succisa and its other herbivores can improve a protection of this particular butterfly. Effects of herbivores of Succisa were examined by several experiments. The first one was a field cage experiment. Its aim was to detect what kinds of herbivores (rodents and invertebrates) are involved in herbivory of leaf rosettes of Succisa and what is their impact on the fitness of these plants. The intensity of herbivory of Succisa was measured for over two vegetation seasons on the month bases. In this experiment were also examined effects of surrounding vegetation on the studied plants of Succisa. The second experiment was performed in a garden. Its aim was to clarify the role of herbivores of leaf rosettes, stalks and their interactions on the fitness of Succisa. The third experiment was concerned to true bugs, which are pre-dispersal predators of seeds of Succisa. Their effects on...
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Factors influencing vegetation establishment during spontanous succession in basalt quarries
Petrů, Anna ; Frouz, Jan (advisor) ; Roubíčková, Alena (referee)
Mining and construction industry is a major environmental disturbance creating habitats with extremely coarse material: gravel, cobbles and boulders. Simultaneously, there is an increasing interest in using spontaneous succession during restoration processes on those areas. This leads to a question if vegetation can establish on such coarse substrates. This project assessed the vegetation establishment on substrates with different grain size as well as the hydrological limitations of those substrates. The aim of this study was to find substrate moisture characteristics supporting vegetation establishment. Four herb species (Koeleria macrantha, Epilobium angustifolium, Artemisia campestris var. campestris and Poa nemoralis) typically occurring on xerothermic basalt rocks were sowed on basalt construction aggregates (0-4, 2-4, 4-8, 8-16, 11-22 and 32-63 mm). There were also made mixtures of coarse aggregates (4-8, 8-16 and 11-22 mm) as a base with 10% or 50% additive of fine aggregates (0-4 mm). The final number of individuals, aboveground and belowground dry biomass were measured and subsequently specific leaf area (SLA) was calculated. They were also measured substrate moisture characteristics: field capacity (PVK) and wilting point (BV) from which available water content (ODV) was obtained as...
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European black alder (Alnus glutinosa L. Gaertn.) in symbiosis with Frankia and their growth on post-mining heap soils
Buchbauerová, Lucie ; Frouz, Jan (advisor) ; Roubíčková, Alena (referee)
Alder (Alnus glutinosa L. Gaertn.) is a species of a pioneer plant usually colonizing sites in the early stage of ecological succession, such as spoil heaps after open-cast brown coal mining in the Sokolov mining district in north western Bohemia, Czech Republic. These spoil heaps are very poor in nutrients available for plants, yet alders grow in a mutualistic relationship with actinomycetes Frankia, which live in root nodules of the alder plants. Frankia are able of fixing atmospheric nitrogen (N2) to ammonia (NH3) molecules, which can be then assimilate by alders, via enzyme nitrogenase. Thus, in the early stages of succession, alders have a competitive advantage to other non- fixing plant species living only on nitrates (NO3 - ) and ammonia ions (NH4 + ) present in soils. The aim of this study was to conduct and assess two greenhouse experiments. The first experiment studied the response of alder growth to presence of Frankia and arbuscular mycorrhizal fungi of order Glomerales. The performance of alder growth was significantly higher when alders were inoculated with both Frankia and mycorrhizal fungi in comparison to when alders have grown on their own or only with a mycorrhizal symbiont - both on 14 and 60 years old soils from Sokolov mines. In the second experiment, soil pH and iron (Fe) and...
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Various methods of soil transfer and inoculation in restoration ecology
Hurychová, Hana ; Frouz, Jan (advisor) ; Roubíčková, Alena (referee)
Soil translocation is a method used in restoration ecology to either salvage habitats threatened by human activity or to restore disturbed habitats. There are various factors affecting the success rate of translocation operations which include the proper selection of a receptor site, method of soil manipulation, soil stockpiling and adequate aftercare. Different methods of soil stripping distinct in their success rates and application for use in habitat restoration, mainly in regards to their effect on the resultant community composition and financial costs. Translocations can result in decrease of biodiversity, but may be a viable option for locations of high conservation value where conservation in situ is not possible, allowing for quick restoration of mature ecosystems. Thorough surveys prior to and after the operation and sufficient allocation of resources are a key factor for successful translocation of soils and the associated biota. Additional research in the fields of invasions, comparison of methods and data analysis of translocation projects may improve the utilization of this technique in the future.
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Establishing of a sports club as a non-for-profit organisation
Roubíčková, Anna ; Čáslavová, Eva (advisor) ; Nekola, Jaroslav (referee)
Title: Establishing of a sports club as a non-for-profit organisation Objectives: The main goal of this thesis is to set general managerial standards, usable as an aid while establishing a sports club as a non-for-profit organisation, and to show their practical use in the process of establishing. Five already existing sports clubs (established as non-for profit organisations) will be analysed. In the first step an analysis of documents (especially law) and analysis of the clubs will be made, followed by a situation analysis. Based on the results of the analysis, we will create a set of norms and practices, helpful for managers establishing a non-for-profit sports club. Methods: In the theoretical part, all areas necessary for establishing a sports club as a non-for-profit organisation were studied - including law, economic activities, management and marketing. Five sports clubs were chosen, intentionally at random. Document analysis has been made, using the club's articles as a source, following the situation analysis for which I have used information gathered by half-structured interviews with the clubs' representatives. Results: Based on the document analysis and situation analysis of the sports clubs, general managerial standards have been set, helpful in the process of establishing a sports...
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