Zobrazují se záznamy 444-463 z 880

    • JATROPHA OIL WITH IRON NANOPARTICLES APPLICATION IN DRILLING PROCESSES 

      Autor: Shalimba , Veikko; Sopko , Vít
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      A performance of heat transfer fluids has a substantial influence on the size, weight and cost of heat transfer systems, therefore, a high-performance heat transfer fluid is very important in many industries. Over the last ...
    • JET ENGINE INLET DISTORTION SCREEN AND DESCRIPTOR EVALUATION 

      Autor: Pečinka , Jiří; Bugajski Thomas, Gabriel; Kmoch , Petr; Jílek , Adolf
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Total pressure distortion is one of the three basic flow distortions (total pressure, total temperature and swirl distortion) that might appear at the inlet of a gas turbine engine (GTE) during operation. Different numerical ...
    • JOINIG OF MG ALLOY AZ31B BY SELECTED TECHNOLOGIES 

      Autor: Kramár , Tomáš; Vondrouš , Petr; Jáňa , Miroslav; Kupec , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This contribution presents metallurgical joining of Mg alloy AZ 31B by several technologies - Friction Stir Welding - FSW, Laser Beam Welding - LBW, soldering and their mutual comparison. The difficulty of joining Mg alloys ...
    • KINEMATIC SYNTHESIS OF CENTRAL-LEVER STEERING MECHANISM FOR FOUR WHEEL VEHICLES 

      Autor: Pramanik , Santiranjan; Thipse , Sukrut Shrikant
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      A central lever steering mechanism has been synthesized to obtain five precision points for a four-wheel vehicle using Hooke and Jeeves optimization method. This compound mechanism has been studied as two identical crossed ...
    • Lab-scale Technology for Biogas Production from Lignocellulose Wastes 

      Autor: Krátký , Lukáš; Jirout , Tomáš; Nalezenec , Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Currently-operating biogas plants are based on the treatment of lignocellulose biomass, which is included in materials such as agriculture and forestry wastes, municipal solid wastes, waste paper, wood and herbaceous energy ...
    • LABORATORY EQUIPMENT FOR AUTOTHERMAL REFORMING OF ORGANIC MATTER IN SUPERCRITICAL WATER 

      Autor: Gajdoš , Matúš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The ability of water to dissolve organic substances is very limited. However, its ability to dissolve them changes if pressure and temperature values reach the so-called critical point (p = 22.06MPa, T = 373.95 °C). Fluid ...
    • LABORATORY TESTING OF THE LEICA AT401 LASER TRACKER 

      Autor: Dvořáček , Filip
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      This paper describes laboratory tests on a Leica AT401laser tracker. As the newer Leica AT402 model also uses the same firmware package, most of the results should also be valid for this device. First, we present the ...
    • LAMBERT FUNCTION METHODs TO STUDY LASER DYNAMICS WITH TIME-DELAYED FEEDBACK 

      Autor: Joglekar N, Yogesh; Vemuri , Gautam; Wilkey , Andrew
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Time-delayed differential equations arise frequently in the study of nonlinear dynamics of lasers with optical feedback and because the analytical solution of such equations can be intractable, one resorts to numerical ...
    • LAPLACE EQUATIONS, CONFORMAL SUPERINTEGRABILITY AND BÔCHER CONTRACTIONS 

      Autor: Kalnins G., Ernest; Miller, Jr , Willard; Subag , Eyal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Quantum superintegrable systems are solvable eigenvalue problems. Their solvability is due to symmetry, but the symmetry is often ``hidden''.The symmetry generators of 2nd order superintegrable systems in 2 dimensions close ...
    • LAPLACE-RUNGE-LENZ VECTOR IN QUANTUM MECHANICS IN NONCOMMUTATIVE SPACE 

      Autor: Prešnajder , Peter; Gáliková , Veronika; Kováčik , Samuel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The object under scrutiny is the dynamical symmetry connected with conservation of the Laplace-Runge-Lenz vector (LRL) in the hydrogen atom problem solved by means of noncommutative quantum mechanics (NCQM). The considered ...
    • LARGE AREA HODOSCOPES FOR MUON DIAGNOSTICS OF HELIOSPHERE AND EARTH’S MAGNETOSPHERE 

      Autor: Yashin, I. I.; Ampilogov, N. V.; Astapov, I.I.; Barbashina, N.S.; Borog, V.V.; Dmitrieva, A.N.; Kokoulin, R.P.; Kompaniets, K.G.; Mannocchi, G.; Mikhailenko, A.S.; Petrukhin, A.A.; Saavedra, O.; Shutenko, V.V.; Trinchero, G.; Yakovleva, E.I.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Muon diagnostics is a technique for remote monitoring of active processes in the heliosphere and the magnetosphere of the Earth based on the analysis of angular variations of muon flux simultaneously detected from all ...
    • Laser Cutting of Materials of Various Thicknesses 

      Autor: 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 ...
    • LASER ULTRASONIC MEASUREMENT OF MECHANICAL DECAY IN LIMESTONE CAUSED BY FREEZE-THAW CYCLES 

      Autor: Kravcov , Alexander; Franek , Ondřej; Morozov , Nikolaj; Kucewicz , Michał; Tomaszewski , Michał; Svoboda , Pavel; Baranowski , Paweł
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In this article, an innovative new method of non-destructive testing for estimating the sensitivity of limestone is presented. An advantage of the laser ultrasonic structuroscopy method is the time and the quality, due to ...
    • LEAD-TIME, INVENTORY, AND SAFETY STOCK CALCULATION IN JOB-SHOP MANUFACTURING 

      Autor: Sellitto Afonso, Miguel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The purpose of this article is to present a method for calculating the lead-time, the inventory, and the safety stock or buffer in job shop manufacturing, which are essentially stochastic variables. The research method is ...
    • LIE ALGEBRA REPRESENTATIONS AND RIGGED HILBERT SPACES: THE SO(2) CASE 

      Autor: Celeghini , Enrico; Gadella , Manuel; del Olmo A, Mariano
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      It is well known that related with the irreducible representations of the Lie group SO(2) we find a discrete basis as well a continuous one. In this paper we revisited this situation under the light of  Rigged Hilbert ...
    • LIE GROUPS AND NUMERICAL SOLUTIONS OF DIFFERENTIAL EQUATIONS: INVARIANT DISCRETIZATION VERSUS DIFFERENTIAL APPROXIMATION 

      Autor: Levi , Decio; Winternitz , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We briefly review two different methods of applying Lie group theory in the numerical solution of ordinary differential equations. On specific examples we show how the symmetry preserving discretization provides difference ...
    • Lifetime Assessment of a Steam Pipeline 

      Autor: 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 ...
    • LIMIT ON UHE NEUTRINO FLUXES FROM THE PIERRE AUGER OBSERVATORY 

      Autor: Maldera, S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The surface detector of the Pierre Auger Observatory is sensitive to Ultra High Energy (UHE) neutrinos. Neutrinos of all flavors can interact in the atmosphere producing inclined showers near the ground. Moreover, ultra ...
    • Linearisation of a second-order nonlinear ordinary differential equation 

      Autor: Maharaj, Adhir; Leach, Peter G. L.; Govender, Megan; Day, David P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      We analyse nonlinear second-order differential equations in terms of algebraic properties by reducing a nonlinear partial differential equation to a nonlinear second-order ordinary differential equation via the point ...
    • Linearised coherent states for non-rational SUSY extensions of the harmonic oscillator 

      Autor: Contreras-Astorga, Alonso; Fernández C., David J.; Muro-Cabral, César
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      In this work, we derive two equivalent non-rational extensions of the quantum harmonic oscillator using two different supersymmetric transformations. For these extensions, we built ladder operators as the product of the ...