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Data analysis from ophthalmologic devices
Brož, Petr ; Hemzal, Dušan (referee) ; Kolář, Radim (advisor)
In the bechelor theses is a brief overview of anatomy, optic environment and the basic refractive errors of the eye. Listed below are the diagnostic techniques that the patient must undergo before cataract surgery (biometry, keratometry of the eye and subjective measure of visual acuity). The practical part consists of two surveys. In the first research are statistically compared (Wilcoxon paired test, Spearman's correlation coefficient) biometrics methods - acoustic and optical biometry. The second research is evaluated subjective level of uncorrected visual acuity before cataract surgery and after. At the end of this work are discussed and evaluated the results of both studies.
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Processing and analysis of ophthalmologic images and data
Brož, Petr ; Hozman, Jiří (referee) ; Kolář, Radim (advisor)
In this work is describe anatomy and physiology of the cornea. The following are the primary non-inflamatory degeneration of the cornea. Then describe the physical principles diagnostic devices for cornea – keratometer, pachymeter, Michelson interferometr and optical coherence tomography (OCT). At the end of the theoretical introduction is describes the principle of laser correction surgery – LASIK. The practical part is divided into two main objectives. The first task is propose an algorithm for automatic detection of corneal surface and then calculation of corneal thickness and size of the chamber angle in Matlab. The aim of the second task is image flap analysis for boundary detection.
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An overview of explosive volcanism on Venus
Baranová, Anna ; Brož, Petr (advisor) ; Tomek, Filip (referee)
An Overview of Explosive Volcanism on Venus - Abstract In this thesis, I aim to provide an overview of explosive volcanism on Venus. The existence of explosive volcanism on Venus is uncertain. Despite unfavorable conditions of high atmospheric density and pressure that hinder explosive volcanic activity, as well as a planetary interior thought to be poor in volatiles that would enable fragmentation, evidence of in the form of putative surface expressions of explosive volcanism on Venus has been proposed - a putative pyroclastic flow deposit, Scathach Fluctus, and a series of locations of radar bright material, interpreted as the deposits of explosive volcanic activity. Numerical modeling of fragmentation and volcanic plume rise has shown that explosive volcanism would only be possible under very specific conditions of vent geometry and location, and magma volatile contents. While H₂O is likely acts as the main volatile on Venus, CO₂ and SO₂ are likely represented in higher percentages in the volatile fraction than on Earth, and hence can lower the required amounts of H₂O to values reasonable under Venusian conditions. If explosive volcanism does occur, it is constrained by the high pressure on the Venusian surface and is believed to exist in the form of pyroclastic density currents, rather than...
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The changes of transport flows and accesibility in Pilsen region in relation to the settlement system
Brož, Petr ; Marada, Miroslav (advisor) ; Květoň, Viktor (referee)
The issue of transport is currently one of the most discussed topics, thanks to deepening regional differentiation causing increased demands on the quality of existing transport links. Especially the attractiveness of centers and the existence of good transport infrastructure, stimulating the development of the region (his success), is becoming one of the most debated issues of our times. This diploma thesis deals with the comparison and evaluation of changes in spatial interaction in the settlement of the Plzeň/ Pilsen region in two time slices (1991 and 2001). Analysis of the interactions of traffic will be done by using statistical methods and using GIS technology. Main attention will be paid to the spatial differentiation of the frequency of traffic flows and transport accessibility. Subsequently, the transport characteristics will be compared with the characteristics of the complex importance of settlement, so the basic relationships between these indicators can be found. Keywords: spatial interaction, accessibility, frequency of public transport, traffic flows, transport regionalization, Plzeň/ Pilsen region.
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Spatial and morphometric features of thermal contraction crack polygons on Mars
Žížalová, Ivana ; Křížek, Marek (advisor) ; Brož, Petr (referee)
The aim of this thesis is to analyze zonality of the thermal contraction crack polygons on the surface of Mars. Their morphology and its variation are analyzed in relation to the latitude of Mars. For spatial and morphological analysis were selected 64 images from the HiRISE (Mars Reconnaissance Orbiter) polychromatic camera dataset, images are covering the bandwidths proportionally. Images were first visually analyzed using HiView. 258 areas containing the thermal contraction crack polygons (with total area of 1184 km2 ) and 1036 well developed thermal contraction crack polygons were further vectorized using ArcMap. The thermal contraction crack polygons were found in every searched latitude which proves the ubiquity of permafrost. The largest amount of the thermal contraction crack polygons have been found in latitudes ±60ř and 45ř. In these latitudes were also found the largest and probably the deepest thermal contraction crack polygons (average length ranges from 42,1 - 73,6 m). The smallest polygons (average length 7,7 m) were found around the equator. "Altitude" has no effect on the spread of the thermal contraction crack polygons on Mars; however it has the effect on its morphology. The most widespread are pentagonal polygons, which occur mainly in the southern hemisphere. The next most...
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Scoria cones on the Moon: morphologies, distribution, and mechanism of their formation
Novotný, Radek ; Brož, Petr (advisor) ; Tomek, Filip (referee)
The recent observations of the Moon show, that there was long-lasting volcanic activity on the lunar surface, that left many volcanic features behind. These features are in the form of lunar seas, which are covering thousands of kilometers wide impact basins, or small volcanic bodies of various shapes. Some of these bodies are relatively small, up to 170 meters high conical bodies occurring on the near side and far side of the Moon. Based on research about the Marius Hills and South Pole-Aitken locations, it was suggested, that these bodies could be a lunar equivalent of terrestrial cinder cones. Cinder cones are created by degassing and fragmentation of magma with subsequent deposition of pyroclastic material into the surroundings. This shape similarity of the lunar cones to the terrestrial cones is surprising, as there is less gravitational acceleration on the Moon's surface and the atmosphere is missing. This means, that particles are able to flow further, and this should also affect the appearance of the volcanic bodies. The aim of this work is to review available literature mentioning lunar cones, to map their frequencies on the surface of the Moon, to determine their basic shapes and explain possible differences or concordances in their shapes with terrestrial cinder cones. On the basis of the...
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Analýza kvalitativních ukazatelů kukuřičné siláže
BROŽ, Petr
The Livestock production is in many ways a progressive discipline, which is characterized in that it blends several seemingly unrelated industries. One of the most important nutrition and feed livestock. With the development of the cultivation of maize (Zea mays), and the need for its preservation, it was necessary to develop a methodology proper ensiling. This practice establishes the correct principles for the production of high-quality, nutritional value and harmless silage. It already belongs to the selection of the optimal hybrid, suitable agronomic measures during cultivation, build a functional and efficient silage lines, selection and application of additives, proper layering and ramming masses and responsible handling of ready-made food, including a ration.
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Small-scale volcanoes on Mars: image analysis, numerical modeling and comparison with terrestrial analogs
Brož, Petr ; Dolejš, David (advisor) ; Rothery, David (referee) ; Baratoux, David (referee)
Small-scale volcanoes represent diverse group of landforms which vary in morphology, morphometry, and mechanisms of their formation. They are the most common volcanic form on Earth, and their existence and basic characteristics were also predicted for Mars. Availability of high-resolution image data now allows to search, identify and interpret such small volcanic features on the martian surface. This thesis extends our knowledge about the small-scale volcanoes with the following objectives: (a) to document the existence of martian analogues to some of the terrestrial volcanoes, in particular scoria cones, tuff cones, tuff rings and lava domes; (b) to establish their morphological and morphometrical parameters; and (c) to examine the effect of environmental factors, which differ on Earth and Mars, on the mechanisms of formation of the scoria cones. Interpretation of remote sensing images and digital elevation models reveals that scoria cones, tuff rings and cones, and lava domes exist on different parts of the martian surface and, in some cases, far away from previously well-known volcanic provinces. Scoria cones have been identified in the volcanic field Ulysses Colles situated within the Tharsis volcanic province; tuff cones and tuff rings have been found in the Nephenthes/Amenthes region at the...
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The changes of transport flows and accesibility in Pilsen region in relation to the settlement system
Brož, Petr ; Marada, Miroslav (advisor) ; Květoň, Viktor (referee)
The issue of transport is currently one of the most discussed topics, thanks to deepening regional differentiation causing increased demands on the quality of existing transport links. Especially the attractiveness of centers and the existence of good transport infrastructure, stimulating the development of the region (his success), is becoming one of the most debated issues of our times. This diploma thesis deals with the comparison and evaluation of changes in spatial interaction in the settlement of the Plzeň/ Pilsen region in two time slices (1991 and 2001). Analysis of the interactions of traffic will be done by using statistical methods and using GIS technology. Main attention will be paid to the spatial differentiation of the frequency of traffic flows and transport accessibility. Subsequently, the transport characteristics will be compared with the characteristics of the complex importance of settlement, so the basic relationships between these indicators can be found. Keywords: spatial interaction, accessibility, frequency of public transport, traffic flows, transport regionalization, Plzeň/ Pilsen region.
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