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Attractors in the complex dynamics of turbulent convection
Kašný, Jakub ; Nechvátal, Luděk (referee) ; Macek, Michal (advisor)
This Bachelor's thesis deals with an application of the HAVOK (Hankel Alternative View of Koopman) numerical method, which seeks attractors and predicts intermittent phenomena in dynamical systems, to data from Rayleigh-Bénard convection (RBC), which are measured at Brno Institute of Scientific Instruments in the group of Cryogenics and Superconductivity. This thesis discusses the theory on which the HAVOK is built and further deepens it compared to the article [2]. Furthermore, it enlightens some issues as the best selection of the embedding dimension r, which we selected based on the quality of regression that HAVOK creates, or the use of the Koopman operator and Taken's embedding theorem, that weren't explicitly explained in the article [2]. We discovered three different methods to compute HAVOK regressions based on and using the codes attached to the article. In the thesis, we inspect the matrices of ordinary differential equations, their behaviour when the initial values are changed and their stability for the different regression models and embedding dimensions. The solution with different initial conditions is plotted so that the attractivity can be seen. Part of the thesis contains description of RBC, its equations of motion and characteristic dimensionless numbers that describe the convection. Moreover, the thesis describes how the data are obtained and processed normally and how are processed in new ways based on the HAVOK method.
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Marketing territorial et écotourisme : Le portefeuille de projet Ardenne Attractivity au c?ur du développement territorial durable ardennais
PACCAUT, Ilane
Territorial initiatives have gained in importance in the promotion of sustainable regional development, due to their ability to take into account the particularities and specific needs of each region. The European Union is actively encouraging such initiatives in order to extend sustainable development throughout its territory. Rural areas, far from urban centers or located on the periphery of major communication routes, as well as those on national borders, can particularly benefit from a sustainable development approach adapted to their unique characteristics. Based on a qualitative study including three interviews, this thesis highlights the role played by strengthening the "Ardenne" tourist destination in the sustainable development of the Ardennes cross-border territory. Generally speaking, it appears that territorial development is based on resources, both material and immaterial, which are specific to each territory, and which are coordinated and enhanced within a project such as the Ardenne Attractivity project portfolio. Integrating the sustainable dimension, in line with its original definition, can be more complex in a territorial project. However, sustainability is an obvious and innovative concept in the Ardennes cross-border context, even if its integration into the overall territorial project requires further reflection.
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Attractors in the complex dynamics of turbulent convection
Kašný, Jakub ; Nechvátal, Luděk (referee) ; Macek, Michal (advisor)
This Bachelor's thesis deals with an application of the HAVOK (Hankel Alternative View of Koopman) numerical method, which seeks attractors and predicts intermittent phenomena in dynamical systems, to data from Rayleigh-Bénard convection (RBC), which are measured at Brno Institute of Scientific Instruments in the group of Cryogenics and Superconductivity. This thesis discusses the theory on which the HAVOK is built and further deepens it compared to the article [2]. Furthermore, it enlightens some issues as the best selection of the embedding dimension r, which we selected based on the quality of regression that HAVOK creates, or the use of the Koopman operator and Taken's embedding theorem, that weren't explicitly explained in the article [2]. We discovered three different methods to compute HAVOK regressions based on and using the codes attached to the article. In the thesis, we inspect the matrices of ordinary differential equations, their behaviour when the initial values are changed and their stability for the different regression models and embedding dimensions. The solution with different initial conditions is plotted so that the attractivity can be seen. Part of the thesis contains description of RBC, its equations of motion and characteristic dimensionless numbers that describe the convection. Moreover, the thesis describes how the data are obtained and processed normally and how are processed in new ways based on the HAVOK method.
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The Environmental Effects on Human Body Odour
Dneboská, Tereza ; Havlíček, Jan (advisor) ; Martinec Nováková, Lenka (referee)
The main source of the human body odour is an axillary region. Human body odour is individually specific and results from genetic and environmental factors. Human body odour is an important sexual attractant for potential partners. It is influenced by environmental factors, such as an emotional state and health. Important environmental factors influencing human body odour are also eating habits. However, we know very little about how particular dietary components shape our body odour. Only the effect of red meat and garlic consumption have been tested. Here we tested the effect of caffeine (from usual source and guarana) and beta- carotene. In our three experiments we used a balanced within-subject experimental design. Volunteers donated twice their body odour: once after ingestion of the tested substance, second time in the control situation. Samples were then assessed for their attractiveness and intensity by group of women. Results showed that caffeine consumption may influence negatively attractiveness and intensity of human body odour. Guarana and beta-carotene did not show any significant results. These results partially confirmed that dietary factors influence the quality of the human body odour. This field should be further studied as a part of the environmental factors influencing human...
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Atraktivita listového opadu pro půdní gamasidní roztoče (Acarina, Gamasida) v experimentu v dekompozičních síťkách
Čápová, Lenka ; Rusek, Josef
A three-year litterbag experiment was established at the Kleť Mt. (Blanský les) in November 2002. Results from the first year of the experiment are presented here. In total 1619 individuals of 35 species of Parasitiformes mites were recorded in the litterbags and soil samples. Veigaiaidae, Parasitidae and Uropodidae were the most abundant mite families. Eighteen species were recorded from beech forest, 67 and 61% of them were established in oak and beech litterbags, respectively. 12 and 5 species recorded in these litterbags did not occur in the soil samples. 19 species were recorded from the spruce forest, 84 and 67% of them were established in oak and beech litterbags, respectively. Eight and five species from these litterbags did not occur in the soil samples.
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