Poslední příspěvky

  • A Study of the Properties of Electrical Insulation Oils and of the Components of Natural Oils 

    Autor: Spohner , Milan
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper presents a study of the electrical and non-electrical properties of insulating oils. For the correct choice of an electrical insulation oil, it is necessary to know its density, dynamic viscosity, dielectric ...
  • The Electrification of Tramways in Ostrava in 1900–1901 

    Autor: Závodná , Michaela
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper focuses on the electrification of tramways in Ostrava in 1900-1901. As the administrative, economic and cultural centre of an evolving industrial agglomeration, Ostrava had specific transportation requirements. ...
  • The Intriguing Nature of the Cataclysmic Variable SS Cygni 

    Autor: Giovannelli , F.; Sabau-Graziati , L.
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    The classification of SS Cyg as a dwarf nova (DN), a subclass of the non–magnetic (NM) cataclysmic variable (CV) has been considered by most of the community as well established because of a paper appeared in Nature (Bath ...
  • Diamond Films for Implantable Electrodes 

    Autor: Henychová , Petra; Hiřmanová , Klára; Vraný , Martin
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    Diamond is a promising material for implantable electrodes due to its unique properties. The aim of this work is to investigate the growth of boron-doped nanocrystalline diamond (B-NCD) films by plasma-enhanced microwave ...
  • Femoral Test Bed for Impedance Controlled Surgical Instrumentation 

    Autor: Brendle , Christian; Niesche , Annegret; Korff , Alexander; Radermacher , Klaus; Leonhardt , Steffen
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    The risk for patients during the standard procedure of revision of cemented artificial hip joints is unsatisfactorily highdue to its high level of invasiveness and limited access to the operative field. To reduce this risk ...
  • Simulation of a Matrix Converter Fed Drive With Sliding Mode Control 

    Autor: Bauer , Jan
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    Induction machines are among the most widely used electrical-to-mechanical converters in electric drives. Their advantageous robustness and simplicity goes hand-in-hand with complicated control. A converter with a suitable ...
  • Development of an Ultralight with a Ducted Fan 

    Autor: Brabec , Jiří; Helmich , Martin
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper introduces the UL-39 project, an ultralight aircraft with a ducted fan, and some of the problems that have arisen in the course of its development. Several problems with the design of a non-traditional aircraft ...
  • Design Process of Energy Effective Shredding Machines for Biomass Treatment 

    Autor: Beniak , Juraj; Ondruška , Juraj; Čačko , Viliam
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    The shredding process has not been sufficiently investigated for the design of better, energy and material saving shredding machines. In connection with present-day concern about the environment, ecology, energy saving, ...
  • Simulation of Free Airfoil Vibrations in Incompressible Viscous Flow — Comparison of FEM and FVM 

    Autor: Sváček , Petr; Horáček , Jaromír; Honzátko , Radek; Kozel , Karel
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper deals with a numerical solution of the interaction of two-dimensional (2-D) incompressible viscous flow and a vibrating profile NACA 0012 with large amplitudes. The laminar flow is described by the Navier-Stokes ...
  • A Numerical Study of Wind Flow Over a Coal Storage Shelter 

    Autor: Bodnár , Tomáš; Beneš , Ludek; Pirkl , Luboš; Gulíková , Eva
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper presents some of the main numerical results obtained while simulating the wind flow over a shelter covering a coal storage. The aim of this numerical study was to evaluate the change in flow patterns caused by ...
  • Transonic Flow of Wet Steam — Numerical Simulation 

    Autor: Halama , Jan
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    The paper presents a numerical simulation of the transonic flow of steam with a non-equilibrium phase change. The flow of steam is approximated by a mixture model complemented by transport equations for moments. Proper ...
  • The Asymptotic Properties of Turbulent Solutions to the NavierStokes Equations 

    Autor: Skalák , Zdenek
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    In this paper we study the large time behavior of solutions to the Navier-Stokes equations. We present a brief survey of results concerning energy decay, and discuss a related phenomenon of the large time energy concentration ...
  • Hierarchical Modeling of Mastic Asphalt in Layered Road Structures Based on the MoriTanaka Method 

    Autor: Valenta , Richard; Šejnoha , Michal
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    We present an application of the Mori-Tanaka micromechanical model for a description of the highly nonlinear behavior of asphalt mixtures. This method is expected to replace an expensive finite element-based fully-coupled ...
  • Synthesis of Mechanisms by Methods of Nonlinear Dynamics 

    Autor: Valášek , Michael; Šika , Zbynek
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper deals with a new method for parametric kinematic synthesis of mechanisms. The traditional synthesis procedure based on collocation, correction and optimization suffers from the local minima of objective functions, ...
  • A MicromechanicsBased Model for Stiffness and Strength Estimation of Cocciopesto Mortars 

    Autor: Nežerka , Václav; Zeman , Jan
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    The purpose of this paper is to propose an inexpensive micromechanics-based scheme for stiffness homogenization and strength estimation of mortars containing crushed bricks, known as cocciopesto. The model utilizes the ...
  • Geometrical Modeling of Concrete Microstructure for the Assessment of ITZ Percolation 

    Autor: Rypl , Daniel; Bým , Tomáš
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    Percolation is considered to be a critical factor affecting the transport properties of multiphase materials. In the case of concrete, the transport properties are strongly dependent on the interfacial transition zone ...
  • Massive Parallelization of Multibody System Simulation 

    Autor: Valášek , Michael; Mráz , Ladislav
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper deals with the decrease in CPU time necessary for simulating multibody systems by massive parallelization. The direct dynamics of multibody systems has to be solved by a system of linear algebraic equations. ...
  • Micromechanical Analysis of Cement Paste with Carbon Nanotubes 

    Autor: Šmilauer , Vít; Hlaváček , Petr; Padevět , Pavel
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    Carbon nanotubes (CNT) are an attractive reinforcement material for several composites, due to their inherently high strength and high modulus of elasticity. There are controversial results for cement paste with admixed ...
  • HygroThermoMechanical Analysis of a Reactor Vessel 

    Autor: Kruis , Jaroslav; Koudelka , Tomáš; Krejčí , Tomáš
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities ...
  • Global Optima for Size Optimization Benchmarks by Branch and Bound Principles 

    Autor: Pospíšilová , Adéla; Lepš , Matej
    (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
    This paper searches for global optima for size optimization benchmarks utilizing a method based on branch and bound principles. The goal is to demonstrate the process for finding these global optima on the basis of two ...

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