Now showing items 21-40 of 100

    • Simulation of Free Airfoil Vibrations in Incompressible Viscous Flow — Comparison of FEM and FVM 

      Author: 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 

      Author: 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 

      Author: 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 

      Author: 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 ...
    • Teaching Management at Technical Universities Business Reality in the Academic Environment 

      Author: Baroch , V.; Duchoň , B.; Faifrová , V.; Říha , Z.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Students of technical universities often do not understand why their studies should include learning management skills (in addition to the study of economics). However, not only the experience of graduates but also the ...
    • FMEA and FTA Analyses of the Adhesive Joining Process using Electrically Conductive Adhesives 

      Author: Povolotskaya , E.; Mach , P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper introduces a formulation of appropriate risk estimation methods that can be used for improving of processes in the electronics area. Two risk assessment methods have been chosen with regard to the specifics of ...
    • Influence of the Surface Layer when the CMT Process Is Used for Welding Steel Sheets Treated by Nitrooxidation 

      Author: Michalec , I.; Marônek , M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Nitrooxidation is a non-conventional surface treatment method that can provide significantly improved mechanical properties as well as corrosion resistance. However, the surface layer is a major problem during the welding ...
    • Modeling of Concrete Creep Based on Microprestresssolidification Theory 

      Author: Havlásek , P.; Jirásek , M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Creep of concrete is strongly affected by the evolution of pore humidity and temperature, which in turn depend on the environmental conditions and on the size and shape of the concrete member. Current codes of practice ...
    • Angular Distribution of GRBs 

      Author: Balázs , L. G.; Mészáros , A.; Horváth , I.; Bagoly , Z.; Veres , P.; Tusnády , G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We studied the complete randomness of the angular distribution of BATSE gamma-ray bursts (GRBs). Based on their durations and peak fluxes, we divided the BATSE sample into 5 subsamples (short1, short2, intermediate, long1, ...
    • Use of Grasses and Mixtures of Grasses for Energy Purposes 

      Author: Andert , David; Frydrych , Jan; Gerndtová , Ilona
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      As levels of agricultural productivity increase, there is also an increase in land area not utilized for food production. This area can be used for growing energy crops, including grasses. When land is set aside for grassing, ...
    • An Optimal Procedure for Determining the Height Parameters of Fracture Surfaces 

      Author: Ficker , T.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents an attempt to find an optimal procedure for determining the height parameters of fracture surfaces. This is a useful task that may significantly increase the reliability of topographic analyses of solids. ...
    • Idealized Compression Ratio for a Screw Briquetting Press 

      Author: Biath , Peter; Ondruška , Juraj
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with issues in determining the ideal compression ratio for a screw briquetting press. First, the principles of operation and a basic description of the main parts of a screw briquetting press are introduced. ...
    • Utilization of Image Intensifiers in Astronomy 

      Author: Vítek , S.; Fliegel , K.; Páta , P.; Koten , P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In this paper we present the properties of image intensifiers, used together with fast TV cameras for astronomical purposes within the MAIA project(Meteor Automatic Imager and Analyser, primarily focused on observing ...
    • Advanced Functions of a Modern Power Source for GMAW Welding of Steel 

      Author: Kolařík , Ladislav; Kolaříková , Marie; Kovanda , Karel; Pantůček , Marek; Vondrouš , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper evaluates the use of a modern welding power source equipped with advanced arc control functions. At the Laboratory of Welding Technologies of CTU in Prague we have focused on GMAW welding of steel using Sigma ...
    • Lifetime Assessment of a Steam Pipeline 

      Author: Janovec , Jiří; Poláchová , Daniela; Junek , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The aim of this paper is to design a method for assessing the life of steam pipes for Czech power plants. The most widely-used material in Czech power plants is steel 15 128. Our findings may also be applied for international ...
    • Metallurgical Joining of Magnesium Alloys by the FSW Process 

      Author: Kupec , Tomáš; Hlavačová , Ivana; Turňa , Milan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with welding AZ 31Mg alloy by FSW (Friction Stir Welding) technology. Welds were fabricated with new equipment supplied from China for VUZ-PI Bratislava (Welding Research Institute — Industrial Institute). ...
    • New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding 

      Author: Jusko , Ondrej
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper focuses on the influence of various types of abrasive grains on cutting properties during the grinding process for bearing steel. In this experiment, not only conventional super-hard abrasive materials but also ...
    • Laser Cutting of Materials of Various Thicknesses 

      Author: Grepl , Martin; Pagáč , Marek; Petrů , Jana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Thise paper deals with the application of laser technology and optimizing the parameters for cutting nickel alloy. The theoretical part of the paper describes various types of lasers, their principles and usage. The ...
    • Fundamental Research on Hydraulic Systems Driven by Alternating Flow 

      Author: Marcu , Ioan-Lucian; Banyai , Daniel-Vasile
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents a new approach to rotary hydraulic systems, and the functional principles of rotary hydraulic systems that can work using alternating flows. Hydraulic transmissions using alternating flows are based on ...
    • Influence of Various Process Parameters on the Density of Sintered Aluminium Alloys 

      Author: Laska , Mateusz; Kazior , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents the results of density measurements carried out on Alumix sintered parts. ECKA Alumix aluminium powders were used because of their wide application in the powder metallurgy industry. The compacts were ...