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Quantitative description of textures in volcanic rocks: Case study of trachybasalt from Dubičná
Ditterová, Hana ; Dolejš, David (advisor) ; Rapprich, Vladislav (referee)
- iii - ENGLISH ABSTRACT Quantitative description of textures, in particular, the distribution of grain sizes, is becoming a powerful tool for interpreting kinetic processes that govern crystallization of igneous rocks. Variation in grain size are frequently represented by logarithm of population density vs. linear crystal size, where the majority of igneous rocks forms a linear trend. Its slope provides an estimate of characteristic grain size, or growth rate and crystallization time, whereas the intercept provides the nucleation density. The log-linear trend is predicted to result from kinetic nucleation and growth processes only, whereas its modifications such as kinks or curvature are due to mechanical separation or accumulation of crystals, magma mixing or Ostwald ripening (coarsening) in the presence of melt. In order to investigate the true, three-dimensional crystal size distribution, the raw two-dimensional data acquired from thin sections or rock slabs must be processed by various stereological methods. We illustrate application of quantitative textural measurements to distribution and origin of clinopyroxene crystals in a trachybasaltic lava flow from Dubičná near Úštěk. This effusion belongs to Cenozoic volcanic products in the Bohemian Massif, specifically to its main Eocene-Miocene stage in...
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Comparement of results from infiltration tests
Blahut, Dominik ; Mazáč, Petr (referee) ; Duchan, David (advisor)
The aim of this thesis is to compare the results of water infiltration from field tests, from laboratories and from numerical modeling at two selected locations. The first objective is the search procedure and the description of both sites and its adjacent areas. Further work continues with infiltration field tests using ring infiltrometer, at first theoretically for each method, and then practically with own personal measurements in the field. Further from the collected soil samples the measurements are performed in the laboratory, first in the permeameter, and followed by the grain size distribution test, from which the hydraulic conductivity is derived by using empirical formulas. At last the numerical modeling is used and all the results are compared. In the final phase of thesis the recommendations are given for infiltration at various locations and comparsion of the infiltration methods.
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Assessment of soil quality processed with conventional tillage in the selected site in the Olomouc region
Drlíková, Barbora ; Doležal, Petr (referee) ; Kameníčková, Ivana (advisor)
Diploma thesis documents the problems of soil quality, which is assessed on the basis of physical, chemical or biological indicators of soil quality. The paper describes the various indicators, its methodology and evaluation. In the practical part evaluates the quality of soil cultivated with the traditional way - using plowing. The experimental area, where the samples were taken from the soil, lies in the Olomouc region in the municipality Šumvald. Evaluated were selected physical, chemical and physico-chemical properties of soil, e.g. particle size distribution, bulk density, porosity, air capacity, hydrolimits, pH, carbonates, humus content and salinity of the soil.
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Sanding process and sanding abrasives for wood
Kříženecký, Ondřej ; Sarvašová Kvietková, Monika (advisor) ; Gašparík, Miroslav (referee)
This bachelor thesis deals with the process of sanding and abrasive materials for wood. It characterizes the process equalize inequality surface of the wood and wood-based materials, which is important operations in the finishing products with highest quality level. It describes the basic methods of machining and sanding their effect on the final surface quality. In the introductory section concisely describes the history of sanding. The next part deals with the main factors affecting the sanding process and their influences on sanding wood. The main part is dedicated to the distribution of abrasive instrument. The structure of abrasive and its characteristics. Describes kinds of abrasive materials and their features. It analyzes the production of abrasive. The next sections deals with the determination of surface quality, surface preparation before sanding, repairing defects and storage of abrasive intruments. The last part analyze the machinery for wood sanding and their distribution. Describes a circular, cylindrical and belt sanders and their characteristics.
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Compactibility of the materials for subgrade
Kolbábek, Jiří ; Varaus, Michal (referee) ; Stehlík, Dušan (advisor)
This thesis is focused on differences between compaction of fine-grained and coarse-grained soils. It presents selected compaction methods and it describes their principles and implementation procedures. In the practical part is performed classification of both types of soils and then samples are compacted by three methods. The result of this work is to compare the effects of compaction on fine-grained and coarse-grained soil.
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Development of industrial floors with utilization of by-product
Radějová, Lucie ; Durica,, Tibor (referee) ; Bydžovský, Jiří (referee) ; Ševčík, Milan (referee) ; Drochytka, Rostislav (advisor)
This work deals with the use of waste materials in the development of new industrial floors. The main task of this work is to choose a suitable waste materials, and design a new material using such materials, while achieving the required physico-mechanical properties. The aim of this work is also to verify the effects of process application, suitable microfiller and final coat and propose a suitable alternative industrial floors, which would not only be in terms of economic efficiency, but also in terms of ecological suitable replacement for commercial products.
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Methylene Blue Test for Plasticity Determination of Brick Clays
Jiroušek, Štěpán ; Stančík,, Hynek (referee) ; Sokolář, Radomír (advisor)
The Bachelor thesis is focused on methods for assesing the plasticity of ceramic raw materials (clays). The theoretical part describes the origin, species, chemical and mineralogical composition of these raw materials. Then we describe the preparations and standardized and nonstandardized methods of assesing the plasticity of clay used in the Czech Republic and abroad. The practical part describes executed tests of brick soils specimen used in the Czech Republic. The outcome of this work is to find correlations between these tests and the determined value of sorption of methylen blue.
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Splaveninová study of a selected flow
Zouhar, Radim ; Maleňák,, Jaroslav (referee) ; Veselý, Jaroslav (advisor)
The bachelor thesis focuses on determination of sediments amount in Svitava river and Křtinský potok, which flows into Svitava river in Adamov. Elements are sedimented at the riverbed bottom if the resulting force caused by the water stream on particles is smaller than the gravitational force. Elements can get into the stream both by washing from surrounding terrain and by material erosion of the riverbed which happens more frequently. Therefore another part of this thesis is suggesting of suitable stabilization measures and flood protection of selected objects. The capacity of riverbeds becomes smaller due to their sedimentation. Particle-size characteristics of sediment runoffs have been prepared and thus the amount of sediment runoffs has been calculated and critically evaluated.
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Kvalitativní zhodnocení stávajícího stavu konstrukčních vrstev vozovek s krytovou vrstvou z MZK na ŠLP Křtiny
Minářová, Hana
MINÁŘOVÁ, H. Qualitative assessment of current state of structural layers of roads with a cover layer of MZK, on ŠLP Křtiny. Bachelor thesis. Brno 2015 Status of forest roads is an important factor in making the forest. We try to keep them in the best possible quality due to the ease of access not only heavy equipment. Monitoring and assassement of the cover layer on the designated forest roads around the village Křtiny. Assessed the current technical condition, and whether the parameters correspond MZK. They were measured physical and mechanical properties of the cover layer with field and laboratory tests. Was monitored compactability, load capacity, humidity and grain.
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