Self-navigation of laser beams on injected IFE targets using SBS PCM technology: conceptual design of the method
Kálal Milan; Slezák Ondřej; Straka Petr
2012 - English Self-navigation of laser beams on IFE targets using SBS PCMSelf-navigation of laser beams on IFE targets using SBS PCM Keywords: Brillouin scattering; laser fusion; laser beam combination Available at various departments of the ČVUT. Self-navigation of laser beams on injected IFE targets using SBS PCM technology: conceptual design of the method

Self-navigation of laser beams on IFE targets using SBS PCMSelf-navigation of laser beams on IFE targets using SBS PCM

Kálal Milan; Slezák Ondřej; Straka Petr
České vysoké učení technické v Praze, 2012

Study of runoff generating processes in mountainous catchment
Císlerová Milena; Hrnčíř Miroslav; Blažková Šárka
2012 - English Employing saturation runoff and interflow processes the presented research is focused on study of runoff formation processes in headwater catchments using statistical multiple regression approach and a water balance approach by dividing the landscape into variable saturated areas. For selected episodes the rainfall-runoff relationship was analyzed in four experimental catchments with more than ten years of continuously recorded hydro-meteorological data. Three of the sites, subjected to monsoonal climate, are located in Ethiopia; the fourth catchment is located in temperate climate region in the Czech Republic. The experimental sites not only differ in climate but also in size, topographic relief and land use.Despite the different characteristics between the catchments, the response is very similar. Each catchment reaches a threshold point where runoff response can be predicted by a linear relationship with rainfall depth. After the rainfall threshold is satisfied the preferential flow pathways become interconnected and the runoff contributing area remains the same independent of the amount of rainfall or its intensity. Up to the threshold value the runoff strongly depends on the initial saturation conditions. With much longer observational time series, it may be possible to identify additional parameters and conceptualize the hydrological behaviour below the threshold. After approximately 500 mm of cumulative seasonal rainfall has fallen since the beginning of the season all the three Ethiopian catchments exhibit consistent hydrological behaviour. In case of the Uhlířská catchment in the Czech Republic, the rainfall total in the range of approximately 60-70 mm is the threshold for significant runoff formation in both the subsurface hillslope stormflow and consequent streamflow.The outcome of applying the framework is a confirmation of the hypothesis (Jakeman and Hornberger, 1993) that, after allowing for antecedent conditions, the response of a catchment is predominantly linear. It may be added that the response is linear over a range of climatological regimes and catchment scales.It is believed that similar conceptual hydrological water balance methods based on comparison and focused on similarities in catchment behaviour can provide needed insight into the water transport process in heterogeneous soils dominated by preferential flow where current approaches fail.Employing saturation runoff and interflow processes the presented research is focused on study of runoff formation processes in headwater catchments using statistical multiple regression approach and a water balance approach by dividing the landscape into variable saturated areas. For selected episodes the rainfall-runoff relationship was analyzed in four experimental catchments with more than ten years of continuously recorded hydro-meteorological data. Three of the sites, subjected to monsoonal climate, are located in Ethiopia; the fourth catchment is located in temperate climate region in the Czech Republic. The experimental sites not only differ in climate but also in size, topographic relief and land use.Despite the different characteristics between the catchments, the response is very similar. Each catchment reaches a threshold point where runoff response can be predicted by a linear relationship with rainfall depth. After the rainfall threshold is satisfied the preferential flow pathways become interconnected and the runoff contributing area remains the same independent of the amount of rainfall or its intensity. Up to the threshold value the runoff strongly depends on the initial saturation conditions. With much longer observational time series, it may be possible to identify additional parameters and conceptualize the hydrological behaviour below the threshold. After approximately 500 mm of cumulative seasonal rainfall has fallen since the beginning of the season all the three Ethiopian catchments exhibit consistent hydrological behaviour. In case of the Uhlířská catchment in the Czech Republic, the rainfall total in the range of approximately 60-70 mm is the threshold for significant runoff formation in both the subsurface hillslope stormflow and consequent streamflow.The outcome of applying the framework is a confirmation of the hypothesis (Jakeman and Hornberger, 1993) that, after allowing for antecedent conditions, the response of a catchment is predominantly linear. It may be added that the response is linear over a range of climatological regimes and catchment scales.It is believed that similar conceptual hydrological water balance methods based on comparison and focused on similarities in catchment behaviour can provide needed insight into the water transport process in heterogeneous soils dominated by preferential flow where current approaches fail. Keywords: catchment; hillslope; rainfall-runoff modelling; rainfall-runoff episodes; soil moisture; subsurface trench; threshold behaviour Available at various departments of the ČVUT. Study of runoff generating processes in mountainous catchment

Employing saturation runoff and interflow processes the presented research is focused on study of runoff formation processes in headwater catchments using statistical multiple regression approach and ...

Císlerová Milena; Hrnčíř Miroslav; Blažková Šárka
České vysoké učení technické v Praze, 2012

Numerical solution of the flow and transport equations with the dual permeability conceptual approach
Valentová Jana; Kuráž Michal
2012 - English The problem of predicting fluid movement in a variably saturated porous medium is important in many fields ranging from agriculture via hydrology to technical applications of dangerous waste disposal in a deep rock formations. Numerical approximation of the coupled processes of the Darcian flow and soluble contaminant transport is intensively studied since 70th of the last century, nevertheless search for an accurate and reliable method is is still a subject of a recent scientific investigation.As the problem of a search for a generally reliable finite element approximation of the Richards' equation is extendible beyond the limits of this thesis, this proposed work focuses mainly on problems associated with the Civil Engineering area, particularly it is a numerical approximation of transport processes related to a problem of the nuclear waste facility Richard, Litoměřiice, the Czech Republic. Computer program DRUtES has been released as a part of this research, it is a two dimensional finite element solver of the coupled model - a variably saturated flow and a soluble transport with a dual permeability conceptual approach.The problem of predicting fluid movement in a variably saturated porous medium is important in many fields ranging from agriculture via hydrology to technical applications of dangerous waste disposal in a deep rock formations. Numerical approximation of the coupled processes of the Darcian flow and soluble contaminant transport is intensively studied since 70th of the last century, nevertheless search for an accurate and reliable method is is still a subject of a recent scientific investigation.As the problem of a search for a generally reliable finite element approximation of the Richards' equation is extendible beyond the limits of this thesis, this proposed work focuses mainly on problems associated with the Civil Engineering area, particularly it is a numerical approximation of transport processes related to a problem of the nuclear waste facility Richard, Litoměřiice, the Czech Republic. Computer program DRUtES has been released as a part of this research, it is a two dimensional finite element solver of the coupled model - a variably saturated flow and a soluble transport with a dual permeability conceptual approach. Keywords: Darcy´s law; van Genuchten´s law; Richards´equation; convection-dispersion-reaction equation; time step adaptivity; finite element method; Fortran; parameter identification; nuclear waste disposal; capillary barrier; contrastive material properties; convection dominance Available at various departments of the ČVUT. Numerical solution of the flow and transport equations with the dual permeability conceptual approach

The problem of predicting fluid movement in a variably saturated porous medium is important in many fields ranging from agriculture via hydrology to technical applications of dangerous waste disposal ...

Valentová Jana; Kuráž Michal
České vysoké učení technické v Praze, 2012

Picoseconds photon counting
Procházka Ivan; Kodet Jan; Haasz Vladimír
2012 - English Available at various departments of the ČVUT. Picoseconds photon counting

Procházka Ivan; Kodet Jan; Haasz Vladimír
České vysoké učení technické v Praze, 2012

The study of new nanostructural composites
Kratochvílová Irena; Kovalenko Alexander; Záliš Stanislav
2012 - English Luminescent diamond defects for bio and quantum applicationLuminescent diamond defects for bio and quantum application Keywords: diamond; nanodiamond; luminescence; defects; DFT Available at various departments of the ČVUT. The study of new nanostructural composites

Luminescent diamond defects for bio and quantum applicationLuminescent diamond defects for bio and quantum application

Kratochvílová Irena; Kovalenko Alexander; Záliš Stanislav
České vysoké učení technické v Praze, 2012

Sea ice thickness estimates in the Weddell sea using laser altimetry and microwave radiometry
Kostelecký Jan; Pokorná Markéta; Klokočník Jaroslav
2012 - English This thesis deals with the estimation and changes of sea-ice thickness in the area of Weddell Sea, Antarctica. Sea-ice thickness estimates were derived from satellite sensors, which posses the unique ability to obtain data from high altitudes above the Earth. The introduction and background to this work are presented in Chapter 1 and the target area in Chapter 2. The satellite sensors used for the estimation of sea-ice thickness employ laser altimetry and microwave radiometry. Some theoretical basics of remote sensing in polar areas are described in Chapter 3. In order to obtain sea-ice thickness, snow thickness from the Advanced Microwave Scanning Radiometer - EOS (AMSR-E) is subtracted from freeboard height. The freeboard height is the total height of the snow cover plus the height of sea ice above the sea surface which can be inferred from data gathered from the Geoscience Laser Altimeter System (GLAS). The AMSR-E and GLAS satellite sensors are described in Chapter 4.This thesis presents some methods previously utilised for the estimation of sea-ice thickness. A well established method for the estimation of sea ice thickness has been modified and applied to data for the Weddell Sea. This thesis is concerned with the process of sea-ice thickness estimation and focuses above all on the choice of geoid, application of sea-ice concentration, averaging of snow data, inclusion of slush layers, and uncertainties in magnitudes regarding the calculation of sea-ice thickness. These sensitivity studies are included in Chapter 5.The resulting data are discussed in Chapter 6: Freeboard minus snow reveals that up to 50% of the Weddell Sea ice may consist of negative freeboard. A slush model is applied to the calculation of sea-ice thickness in the areas with negative freeboard heights. The sea-ice thicknesses in the Weddell Sea are estimated for 14 austral seasons between 2003 and 2008. The map resolution is 50 km x 50 km, and mean sea-ice thicknesses range from 1.64 to 2.28 m in autumn 2003 - 2008, from a thickness of 1.39 to 1.78 m in winter 2004 - 2006, and from a thickness of 2.49 to 3.11 m in spring 2003 - 2007. Repeating seasonal cycles are reflected in the maps with a thinning of the sea ice from spring to autumn. Gratifyingly, the histograms of sea-ice thickness distributions produced by these analyses are strikingly similar to those in the most recent publication of Yi et al. (2011).This thesis deals with the estimation and changes of sea-ice thickness in the area of Weddell Sea, Antarctica. Sea-ice thickness estimates were derived from satellite sensors, which posses the unique ability to obtain data from high altitudes above the Earth. The introduction and background to this work are presented in Chapter 1 and the target area in Chapter 2. The satellite sensors used for the estimation of sea-ice thickness employ laser altimetry and microwave radiometry. Some theoretical basics of remote sensing in polar areas are described in Chapter 3. In order to obtain sea-ice thickness, snow thickness from the Advanced Microwave Scanning Radiometer - EOS (AMSR-E) is subtracted from freeboard height. The freeboard height is the total height of the snow cover plus the height of sea ice above the sea surface which can be inferred from data gathered from the Geoscience Laser Altimeter System (GLAS). The AMSR-E and GLAS satellite sensors are described in Chapter 4.This thesis presents some methods previously utilised for the estimation of sea-ice thickness. A well established method for the estimation of sea ice thickness has been modified and applied to data for the Weddell Sea. This thesis is concerned with the process of sea-ice thickness estimation and focuses above all on the choice of geoid, application of sea-ice concentration, averaging of snow data, inclusion of slush layers, and uncertainties in magnitudes regarding the calculation of sea-ice thickness. These sensitivity studies are included in Chapter 5.The resulting data are discussed in Chapter 6: Freeboard minus snow reveals that up to 50% of the Weddell Sea ice may consist of negative freeboard. A slush model is applied to the calculation of sea-ice thickness in the areas with negative freeboard heights. The sea-ice thicknesses in the Weddell Sea are estimated for 14 austral seasons between 2003 and 2008. The map resolution is 50 km x 50 km, and mean sea-ice thicknesses range from 1.64 to 2.28 m in autumn 2003 - 2008, from a thickness of 1.39 to 1.78 m in winter 2004 - 2006, and from a thickness of 2.49 to 3.11 m in spring 2003 - 2007. Repeating seasonal cycles are reflected in the maps with a thinning of the sea ice from spring to autumn. Gratifyingly, the histograms of sea-ice thickness distributions produced by these analyses are strikingly similar to those in the most recent publication of Yi et al. (2011). Keywords: polar research; remote sensing; sea ice; sea ice thickness; snow; freeboard; slush; altimetry; radiometry; geoid; sea surface height; Weddell Sea; ICESat; Antarctica Available at various departments of the ČVUT. Sea ice thickness estimates in the Weddell sea using laser altimetry and microwave radiometry

This thesis deals with the estimation and changes of sea-ice thickness in the area of Weddell Sea, Antarctica. Sea-ice thickness estimates were derived from satellite sensors, which posses the unique ...

Kostelecký Jan; Pokorná Markéta; Klokočník Jaroslav
České vysoké učení technické v Praze, 2012

Generalized Palindromes in Infinite Words
Pelantová Edita; Starosta Štěpán; Holub Štěpán
2012 - English Generalized Palindromes in Infinite WordsGeneralized Palindromes in Infinite Words Keywords: sturmian words; generalised palindrome; generalized palindromic richness Available at various departments of the ČVUT. Generalized Palindromes in Infinite Words

Generalized Palindromes in Infinite WordsGeneralized Palindromes in Infinite Words

Pelantová Edita; Starosta Štěpán; Holub Štěpán
České vysoké učení technické v Praze, 2012

Paralelní algoritmy pro získávání frekventovaných množin položek
Tvrdík Pavel; Kessl Robert
2012 - English Available at various departments of the ČVUT. Paralelní algoritmy pro získávání frekventovaných množin položek

Tvrdík Pavel; Kessl Robert
České vysoké učení technické v Praze, 2012

X-ray structural analysis of enzyme from extremophile microorganisms and their complexes with bound ligands
Dohnálek Jan; Štěpánková Andrea; Brynda Jiří
2012 - English Keywords: X-ray structural analysis; crystallization; synchrotron; diffraction, Available at various departments of the ČVUT. X-ray structural analysis of enzyme from extremophile microorganisms and their complexes with bound ligands

Dohnálek Jan; Štěpánková Andrea; Brynda Jiří
České vysoké učení technické v Praze, 2012

k0 standardization in neutron activation analysis at LVR-15 reactor in Řež
Kučera Jan; Kubešová Marie; Vobecký Miloslav
2012 - English k0 standardization in neutron activation analysis at LVR-15 reactork0 standardization in neutron activation analysis at LVR-15 reactor Keywords: k0 standardization; neutron activation analysis Available at various departments of the ČVUT. k0 standardization in neutron activation analysis at LVR-15 reactor in Řež

k0 standardization in neutron activation analysis at LVR-15 reactork0 standardization in neutron activation analysis at LVR-15 reactor

Kučera Jan; Kubešová Marie; Vobecký Miloslav
České vysoké učení technické v Praze, 2012