Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 864-880 z 880

    • Velikhov Electrothermal Instability Cancellation by a Modification of Electrical Conductivity Value in a Streamer by Magnetic Confinement 

      Autor: Petit , Jean P.; Dore , Jean C.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We present a method, confirmed experimentally, allowing the cancellation of Velikhov instability by operating a local magnetic field reduction along a lane, which enhances local electric conductivity and electron-gas ...

    • VERIFICATION AND VALIDATION OF NUMERICAL MODEL OF FIRE AND SMOKE DEVELOPMENT IN RAILWAY TUNNEL 

      Autor: Cabová , Kamila; Wald , František
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      The paper describes verification and validation of numerical model of fire and smoke development in a railway tunnel carried out in numerical code Fire Dynamic Simulator. To evaluate a correctness of numerical solution of ...

    • VERIFICATION OF BEHAVIOUR OF HUMAN ENAMEL FOR FRACTURE TOUGHNESS DETERMINATION 

      Autor: Hájková , Petra; Jíra , Aleš; Řehounek , Luboš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Enamel is the hardest biological tissue in the human body because of its structureand composition. The structure of interlocking rods enables this biomaterial to resist the stresses of mastication. Unfortunately, enamel ...

    • VERIFICATION OF CENSUS DEVICES IN TRANSPORTATION RESEARCH 

      Autor: Petrů, Jan; Kludka, Michal; Krivda, Vladislav; Mahdalova, Ivana; Zeman, Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The article presents a comparison of three devices and two methods that are used to count traffic flow. All measurements were carried out at a roundabout in Ostrava, where the following devices were used: Viacount II, Icoms ...

    • VERSATILE CHIRP SINE GENERATOR ON FIXED-POINT FPGA 

      Autor: Kunz, Jan; Beneš, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper deals with a logarithmic and a linear chirp sine generation on a fixed-point FPGA mainly for vibration testing, nevertheless, the generator can also be used in other areas. A basic overview of the logarithmic ...

    • WAAM TECHNOLOGY OPTIMIZED BY OFF-LINE 3D ROBOT SIMULATION 

      Autor: Gurčík, Tomáš; Kovanda, Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      WAAM (Wire + Arc Additive Manufacturing) is an alternative additive technology that combines an electric arc as a heat source, filler material in the form of a wire for welding and cladding individual weld passes so as to ...

    • Water-air ejector with conical-cylindrical mixing chamber 

      Autor: Sliusenko, Andrii; Ponomarenko, Vitalii; Forostiuk, Inna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      In the paper, the hydrodynamics of the liquid-gas mixture in the mixing chamber of the ejectors at different spatial positions was analyzed and the comparative study of such ejectors was carried out. It was found that a ...

    • Weakly Ordered A-Commutative Partial Groups of Linear Operators Densely Defined on Hilbert Space 

      Autor: Janda , Jirí
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The notion of a generalized effect algebra is presented as a generalization of effect algebra for an algebraic description of the structure of the set of all positive linear operators densely defined on a Hilbert space ...

    • WEAR BEHAVIOUR OF VANES FOR A ROTARY VANE EXPANDER WITH VARIOUS GRAPHITE MATERIALS UNDER DRY SLIDING CONDITIONS 

      Autor: Vodička , Václav; Novotný , Václav; Mascuch , Jakub
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This study presents tribological properties of various graphite materials of vanes for rotary vane expanders. A test device was developed in order to measure the wear and power dissipation under conditions similar to a ...

    • WELDING OF NITINOL BY SELECTED TECHNOLOGIES 

      Autor: Kramár , Tomáš; Tauer , Jan; Vondrouš , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Nitinol is a perspective alloy that is difficult to weld because of its high sensitivity to heat, atmospheric gases and the NiTi phase instability. We evaluated several welding techniques with regard to their applicability ...

    • WHAT IS NEW IN ASTROPARTICLE PHYSICS 

      Autor: Giovannelli, Franco
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this brief review paper I will point to the most important steps that have been made in recent decades toward a better understanding of the physics governing our Universe. Because of the limited length of this paper, I ...

    • X-ray Spectroscopic Characterization of Shock-Ignition-Relevant plasmas 

      Autor: Šmíd , Michal; Antonelli , Luca; Renner , Oldoich
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Experiments with multilayer plastic/Cu targets performed at a PALS laser system aimed at the study of matter at conditions relevant to a shock ignition ICF scheme, and, in particular, at the investigation of hot electrons ...

    • X-RAY TRANSMISSION AND REFLECTION THROUGH A COMPTON-THICK MEDIUM VIA MONTE-CARLO SIMULATIONS 

      Autor: Eikmann , Wiebke; Wilms , Jörn; Smith K., Randall; Lee C., Julia
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The spectral shape of an X-ray source strongly depends on the amount and distribution of the surrounding material. The spectrum of a primary source which is located in an optically thin medium with respect to Compton ...

    • X-RAY VARIABILITY STUDY OF POLAR SCATTERED SEYFERT1 GALAXIES 

      Autor: Beuchert, Tobias; Wilms, Jörn; Kadler, Matthias; Longinotti, Anna Lia; Guainazzi, Matteo; Miniutti, Giovanni; de la Calle, Ignacio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We study 12 Seyfert 1 galaxies with a high level of optical polarization. Optical light emerging from the innermost regions is predominantly scattered in a polar region above the central engine directly in our line of ...

    • XMM-NEWTON SCIENTIFIC HIGHLIGHTS: X-RAY SPECTROSCOPIC POPULATION STUDIES OF AGN 

      Autor: Guainazzi, Matteo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this paper I review the contribution that the XMM-Newton ESA X-ray mission has given to our understanding of Active Galactic Nuclei, together with other operational, and complementary, X-ray facilities. I will focus on ...

    • ZnO-Zeolite nanocomposite application for photocatalytic degradation of procion red and its adsorption isotherm 

      Autor: Agustina, Tuty Emilia; Gayatri, Rianyza; Bahrin, David; Moeksin, Rosdiana; Gustini
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      In this paper, the photocatalytic degradation of procion red dye, one of the most frequently used dyes in the textile industry, was studied. The objective of the research is to study the ZnO-Zeolite nanocomposite application ...

    • ŽAMPA’S SYSTEMS THEORY: A COMPREHENSIVE THEORY OF MEASUREMENT IN DYNAMIC SYSTEMS 

      Autor: Rychtáriková , Renata; Urban , Jan; Štys , Dalibor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article outlines in memoriam Prof. Pavel Žampa’s concepts of system theory which enable us to devise a measurement in dynamic systems independently of the particular system behaviour. From the point of view of Žampa’s ...