Procházení ČVUT - elektronické publikace dle data publikování

Zobrazují se záznamy 81-100 z 1904

    • 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. ...

    • Hygro-Thermo-Mechanical 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 ...

    • 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 ...

    • OOFEM — an Object-oriented Simulation Tool for Advanced Modeling of Materials and Structures 

      Autor: Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The aim of this paper is to describe the object-oriented design of the finite element based simulation code. The overall, object-oriented structure is described, and the role of the fundamental classes is discussed. The ...

    • 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 ...

    • The Asymptotic Properties of Turbulent Solutions to the Navier-Stokes 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 ...

    • Structural Variability of 3C 111 on Parsec Scales 

      Autor: Grossberger , C.; Kadler , M.; Wilms , J.; Müller , C.; Beuchert , T.; Ros , E.; Ojha , R.; Aller , M.; Aller , H.; Angelakis , E.; Fuhrmann , L.; Nestoras , I.; Schmidt , R.; Zensus , J. A.; Krichbaum , T. P.; Ungerechts , H.; Sievers , A.; Riquelme , D.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We discuss the parsec-scale structural variability of the extragalactic jet 3C111 related to a major radio flux density outburst in 2007. The data analyzed were taken within the scope of the MOJAVE, UMRAO, and F-GAMMA ...

    • The Optical Transient Search in the Bamberg Southern Sky Survey: Preliminary Results 

      Autor: Hudec , R.; Kopel , F.; Krapp , P.; Heber , U.; Cayé , W.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A large fraction of gamma-ray bursts temporarily emit optical light, i.e. optical afterglows and optical transients. So far, optical transients have only been detected after related gamma-ray satellite detection. However, ...

    • BOOTES Observation of GRB 080603B 

      Autor: Jelínek , M.; Gorosabel , J.; Castro-Tirado , A. J.; Postigo , A. de Ugarte; Guziy , S.; Cunniffe , R.; Kubánek , P.; Prouza , M.; Vítek , S.; Hudec , R.; Reglero , V.; Sabau-Graziati , L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We report on multicolor photometry of long GRB080603B afterglow from BOOTES-1B and BOOTES-2. The optical afterglow has already been reported to present a break in the optical lightcurve at 0.12 ± 0.2 days after the trigger. ...

    • Ultra Low Dispersion Spectroscopy with Gaia and Astronomical Slitless Surveys 

      Autor: Hudec , R.; Hudec , L.; Klíma , M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The ultra-low dispersion spectroscopy to be applied in the ESA Gaia space observatory and the ground-based objective-prism plate surveys represent a similar type of astrophysical data. Although the dispersion in plate ...

    • S5 1803+78 Revisited 

      Autor: Nesci , R.; Maselli , A.; Montagni , F.; Sclavi , S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic ...

    • On the Relation Between GRB Classes and Xray Flashes 

      Autor: Bagoly , Z.; Veres , P.; Horváth , I.; Mészáros , A.; Balázs , L. G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Gamma-ray bursts are usually classified into either short-duration or long-duration bursts. Going beyond the short-long classification scheme, it has been shown on statistical grounds that a third, intermediate population ...

    • Advanced Functions of a Modern Power Source for GMAW Welding of Steel 

      Autor: 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 ...

    • Creating a Multi-axis Machining Postprocessor 

      Autor: Vavruška , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper focuses on the postprocessor creation process. When using standard commercially available postprocessors it is often very difficult to modify its internal source code, and it is a very complex process, in many ...

    • Influence of the Amount of Master Alloy on the Properties of Austenitic Stainless Steel AISI 316L Powder Sintered in Hydrogen 

      Autor: Skaloń , Mateusz; Kazior , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      AISI 316L austenitic stainless steel powder was modified with four different amounts of boron (0.1; 0.2; 0.3; 0.4 of wt. %) in the form of MasterAlloy micro-powder, and was sintered in a pure dry hydrogen atmosphere in ...

    • Concepts of Emission Reduction in Fluidized Bed Combustion of Biomass 

      Autor: Purgar , Amon; Winter , Franz
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A status report on fluidized bed technology in Austria is under preparation, in response to the Fluidized Bed Conversion multi-lateral technology initiative of the International Energy Agency. This status report focuses ...

    • Metallurgical Joining of Magnesium Alloys by the FSW Process 

      Autor: 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). ...

    • Fundamental Research on Hydraulic Systems Driven by Alternating Flow 

      Autor: 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 

      Autor: 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 ...