Sušení zemního plynu
Ditl Pavel; Netušil Michal
2014 - Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Sušení zemního plynu

Ditl Pavel; Netušil Michal
České vysoké učení technické v Praze, 2014

Optimalizace jízdních vlastností nízkopodlažních tramvají
Rus Ladislav; Čapek Jan
2014 - Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Optimalizace jízdních vlastností nízkopodlažních tramvají

Rus Ladislav; Čapek Jan
České vysoké učení technické v Praze, 2014

Analýza chování vodního filmu a jeho rozpadu na profilu NACA0012 pomocí numerických a experimentálních metod
Šafařík Pavel; Mužík Tomáš
2014 - Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Analýza chování vodního filmu a jeho rozpadu na profilu NACA0012 pomocí numerických a experimentálních metod

Šafařík Pavel; Mužík Tomáš
České vysoké učení technické v Praze, 2014

Možnosti energetických úspor v systémech chlazení budov
Papež Karel; Smažilová Eva
2014 - český Snaha o snížení spotřeby primární energie se významně promítla do celkové energetické koncepce pro novostavby i stávající budovy. Požadavky na výstavbu jsou zakotvené v legislativních a normových předpisech. V podmínkách České republiky je tradičně kladen důraz na úspory v zimním období. Došlo proto k rozšíření počtu instalací obnovitelných zdrojů tepla. Potřeba chladu je ale stále nejčastěji hrazena pomocí energeticky velmi náročných tradičních strojních chladicích systémů.Práce se zaměřuje na popsání způsobů snížení potřeby energie na výrobu chladu. Opatření vycházejí z vlastního provozu zdrojů chladu, z omezení tepelné zátěže a z aplikace metod pasivního chlazení. V práci je sestaven přehled jednotlivých způsobů se zohledněním jejich specifických požadavků na využitelnost a provozní podmínky.Při posuzování vhodnosti jejich použití je možné vycházet z historických realizací a výsledků výzkumů. Hlavním měřítkem pro posuzování je člověk a jeho požadavky na parametry vnitřního prostředí. Budova by měla být pro zajištění funkčnosti opatření vnímána jako celek. Vlastní návrh by se měl stát souborným dílem specialistů v jednotlivých oborech zajišťující optimální podmínky vnitřního prostředí vycházející z potřeb jeho uživatelů.S ohledem na klimatické podmínky vhodné pro využití chladícího účinku větrání byla v práci zvláštní pozornost věnovaná nočnímu chlazení. Účinek přirozeného nočního větrání byl posuzován na základě měření v objektu s realizovaným systémem přirozeného nočního větrání a byl ověřován počítačovými modely.Při zohlednění negativních účinků okrajových podmínek jeho návrhu může noční chlazení sloužit jako jediný zdroj chladu v objektu.Efforts to reduce consumption of primary energy influence the energy concept. Requirements for new and existing buildings are protected by the legislative and standards. In the Czech Republic the main focus is traditionally on the savings during the winter period. It leads into the increase of the usage of renewable heating sources. Cooling demand is still mostly provided by traditional mechanical cooling systems.The thesis provides the list of measure for reducing the consumption of the energy in cooling systems. The measures are based on the cooling system´s operation, on the heat gain reduction and on passive cooling strategies. The thesis contains a list of the strategies considering the specific conditions for the installation. Their use can be consulted with the historical applications and the research´s results. The main criterion for evaluation is a human with his requirements for the internal microclimate. Building design should be a comprehensive work of specialists to ensure optimal microclimate for the users.Special attention was paid to the cooling effect of natural ventilation. The impact of natural night ventilation was judged on the measured data and the results for computer simulations.With regard to the climatic conditions in Czech Republic night cooling might be used as the single cooling strategy in the building. Klíčová slova: tepelná zátěž; vnitřní prostředí; pasivní chlazení; noční chlazení heat gain; indoor microclimate; passive cooling; night cooling Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Možnosti energetických úspor v systémech chlazení budov

Snaha o snížení spotřeby primární energie se významně promítla do celkové energetické koncepce pro novostavby i stávající budovy. Požadavky na výstavbu jsou zakotvené v legislativních a normových ...

Papež Karel; Smažilová Eva
České vysoké učení technické v Praze, 2014

Method for measuring lens distortion
Pavelka Karel; Řezníček Jan; Mikš Antonín
2014 - anglický A new method for measuring glass lens distortion based on using distortion-free pinhole lens is proposed, where the measure of the distortion progress is derived by comparing two images of the calibration field given by pinhole lens and glass lens. Such a simple procedure of lens calibration is advantageous as no additional parameters, that could influence the reliability of the estimation, have to be considered. Those additional parameters are usually the elements of EO which in certain camera component configurations highly correlates with the lens distortion characteristics. Furthermore, such an approach based on measuring relative values given by the comparison of two images do not require absolute position of the calibration field targets which reduces additional sources of error given by target surveying. Particularly, the lens distortion variation induced by change in magnification or aperture can be easily obtained. The proposed method for measuring lens distortion is applied in an experimental investigation leading to the confirmation of the validity of the theoretical development. The result of the investigation derives a promising new possibility for accurate lens calibration.A new method for measuring glass lens distortion based on using distortion-free pinhole lens is proposed, where the measure of the distortion progress is derived by comparing two images of the calibration field given by pinhole lens and glass lens. Such a simple procedure of lens calibration is advantageous as no additional parameters, that could influence the reliability of the estimation, have to be considered. Those additional parameters are usually the elements of EO which in certain camera component configurations highly correlates with the lens distortion characteristics. Furthermore, such an approach based on measuring relative values given by the comparison of two images do not require absolute position of the calibration field targets which reduces additional sources of error given by target surveying. Particularly, the lens distortion variation induced by change in magnification or aperture can be easily obtained. The proposed method for measuring lens distortion is applied in an experimental investigation leading to the confirmation of the validity of the theoretical development. The result of the investigation derives a promising new possibility for accurate lens calibration. Klíčová slova: Photogrammetry; Computer vision; Camera calibration; Lens distortion; Pinhole lens. Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Method for measuring lens distortion

A new method for measuring glass lens distortion based on using distortion-free pinhole lens is proposed, where the measure of the distortion progress is derived by comparing two images of the ...

Pavelka Karel; Řezníček Jan; Mikš Antonín
České vysoké učení technické v Praze, 2014

Fire resistance of fibre reinforced concrete floors
Vodička Jan; Welz Markus Jochen; Procházka Petr
2014 - anglický Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Fire resistance of fibre reinforced concrete floors

Vodička Jan; Welz Markus Jochen; Procházka Petr
České vysoké učení technické v Praze, 2014

Dynamic analysis of grandstands
Máca Jiří; Rokoš Ondřej
2014 - anglický The purpose of this thesis is to provide a systematic approach to the modelling of the crowd-grandstand problem taking into account various sources of randomness in complex FEM-based numerical approach using geometries, material properties and other parameters from the models for the static analysis. Further, to quantify performance and efficiency of this method in comparison with direct Monte Carlo simulation. To this end, stochastic calculus in terms of Itô's integral and Brownian motion process is employed to derive moment equations describing the resulting output quantities which can be subsequently used to asses overall serviceability and reliability of the system. Utilizing various methods which reduce the size of the corresponding mathematical model, the approach becomes tractable and quite efficient. It is demonstrated on several examples that not only the randomness of the induced active crowd forces can be captured, but also a random spatial distribution of a crowd and uncertainties in biodynamic models reflecting passive spectators. Since the approach is in its essence analytical, it illuminates and reveals several relationships between the behavior of the system response and particular sources of randomness.The purpose of this thesis is to provide a systematic approach to the modelling of the crowd-grandstand problem taking into account various sources of randomness in complex FEM-based numerical approach using geometries, material properties and other parameters from the models for the static analysis. Further, to quantify performance and efficiency of this method in comparison with direct Monte Carlo simulation. To this end, stochastic calculus in terms of Itô's integral and Brownian motion process is employed to derive moment equations describing the resulting output quantities which can be subsequently used to asses overall serviceability and reliability of the system. Utilizing various methods which reduce the size of the corresponding mathematical model, the approach becomes tractable and quite efficient. It is demonstrated on several examples that not only the randomness of the induced active crowd forces can be captured, but also a random spatial distribution of a crowd and uncertainties in biodynamic models reflecting passive spectators. Since the approach is in its essence analytical, it illuminates and reveals several relationships between the behavior of the system response and particular sources of randomness. Klíčová slova: grandstand; active crowd; passive crowd; white noise process; biodynamic model; spatial crowd distribution; dynamic response; serviceability and reliability assessment; simulation; stochastic differential equations. Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Dynamic analysis of grandstands

The purpose of this thesis is to provide a systematic approach to the modelling of the crowd-grandstand problem taking into account various sources of randomness in complex FEM-based numerical ...

Máca Jiří; Rokoš Ondřej
České vysoké učení technické v Praze, 2014

Comparative static analysis of tunnelling methods NATM and ADECO-RS
Barták Jiří; Černá Vydrová Linda; Šejnoha Michal
2014 - anglický New Austrian Tunnelling Method (NATM) has been used almost exlusively in the Czech Republic in the last three decades. This method has many supporters, whose resistance to new methods and approaches prevents the integration of other methods to the tunnelling industry in the Czech Republic. One of the methods thus neglected is the Italian method called ADECO-RS, which has reached significant use also outside Italy. It is a method of controlled deformation, which uses mainly the horizontal anchoring of the tunnel face to reinforce the area in front of the face (advance core). This technology is especially important in weak and soft rocks where it is necessary to excavate quickly and smoothly with minimum disruption of initial stress state of the rock mass in the vicinity of the excavation. It can be assumed that the use of NATM is in some cases uneconomical and technically inadequately challenging and in such cases it would be appropriate to choose another technology. Given the facts above, in the Czech environment there is no data available for comparison of these methods not only in terms of numerical modelling, but also in terms of feasibility and usability.The work briefly summarizes the history of the tunnelling methods and it is closer devoted to NATM and ADECO-RS tunnelling approaches. The basic principles of both methods are set and further the comparison of these methods is made on a theoretical level and in terms of numerical modelling, which was performed in the program PLAXIS 3D-Tunnel. The thesis hereinafter includes the analysis of fibreglass face anchors application during the construction of three-aisled Veleslavín Station and the impact assessment of tunnel face anchoring during the excavation of ventilation tunnel on the newly built part of the Prague Metro "V.A". The work also deals with practical knowledge gained during the technical visit of Italian Val di Sambro tunnel which is built according to ADECO-RS approach. These findings are essential for the correct interpretation of Lunardi method. Finally, the thesis briefly summarize the tunnel construction process by ADECO-RS method.New Austrian Tunnelling Method (NATM) has been used almost exlusively in the Czech Republic in the last three decades. This method has many supporters, whose resistance to new methods and approaches prevents the integration of other methods to the tunnelling industry in the Czech Republic. One of the methods thus neglected is the Italian method called ADECO-RS, which has reached significant use also outside Italy. It is a method of controlled deformation, which uses mainly the horizontal anchoring of the tunnel face to reinforce the area in front of the face (advance core). This technology is especially important in weak and soft rocks where it is necessary to excavate quickly and smoothly with minimum disruption of initial stress state of the rock mass in the vicinity of the excavation. It can be assumed that the use of NATM is in some cases uneconomical and technically inadequately challenging and in such cases it would be appropriate to choose another technology. Given the facts above, in the Czech environment there is no data available for comparison of these methods not only in terms of numerical modelling, but also in terms of feasibility and usability.The work briefly summarizes the history of the tunnelling methods and it is closer devoted to NATM and ADECO-RS tunnelling approaches. The basic principles of both methods are set and further the comparison of these methods is made on a theoretical level and in terms of numerical modelling, which was performed in the program PLAXIS 3D-Tunnel. The thesis hereinafter includes the analysis of fibreglass face anchors application during the construction of three-aisled Veleslavín Station and the impact assessment of tunnel face anchoring during the excavation of ventilation tunnel on the newly built part of the Prague Metro "V.A". The work also deals with practical knowledge gained during the technical visit of Italian Val di Sambro tunnel which is built according to ADECO-RS approach. These findings are essential for the correct interpretation of Lunardi method. Finally, the thesis briefly summarize the tunnel construction process by ADECO-RS method. Klíčová slova: NATM; ADECO-RS; tunnelling; tunnel face; advance core; numerical modelling; horizontal anchoring Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Comparative static analysis of tunnelling methods NATM and ADECO-RS

New Austrian Tunnelling Method (NATM) has been used almost exlusively in the Czech Republic in the last three decades. This method has many supporters, whose resistance to new methods and approaches ...

Barták Jiří; Černá Vydrová Linda; Šejnoha Michal
České vysoké učení technické v Praze, 2014

Příprava a charakterizace vybraných uhlíkových nanostuktur
Bryknar Zdeněk; Babchenko Oleg; Veselý Marián
2014 - Diamond and carbon nanotubes synthesizing and basic study Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Příprava a charakterizace vybraných uhlíkových nanostuktur

Diamond and carbon nanotubes synthesizing and basic study

Bryknar Zdeněk; Babchenko Oleg; Veselý Marián
České vysoké učení technické v Praze, 2014

Numerické řešení transonického turbulentního proudění metodou konečných objemů
Kozel Karel; Trefilík Jiří
2014 - Plné texty jsou dostupné na jednotlivých katedrách ČVUT. Numerické řešení transonického turbulentního proudění metodou konečných objemů

Kozel Karel; Trefilík Jiří
České vysoké učení technické v Praze, 2014