Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 436-455 z 880

    • INVERTED PENDULUM WITH LINEAR SYNCHRONOUS MOTOR SWING UP USING BOUNDARY VALUE PROBLEM 

      Autor: Koska , Lukáš; Jadlovská , Slávka; Vošček , Dominik; Jadlovská , Anna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Research in the field of underactuated systems shows that control algorithms which take the natural dynamics of the system’s underactuated part into account are more energy-efficient than those utilizing fully-actuated ...

    • INVESTIGATING THE Ep, i –Eiso CORRELATION 

      Autor: Amati, Lorenzo; Dichiara, Simone
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The correlation between the spectral peak photon energy, Ep, and the radiated energy or luminosity (i.e., the “Amati relation” and other correlations derived from it) is one of the central and most debated topics in GRB ...

    • INVESTIGATION OF COMPRESSIBLE FLOW THROUGH A TURBINE BLADE CASCADE FOR VARIOUS TRANSONIC FLOW REGIMES 

      Autor: Louda, Petr; Příhoda, Jaromír; Šafařík, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper deals with the numerical simulation of 2D transonic flow through the SE1050 turbine blade cascade at various flow conditions. The first one concerns the design operation with a zero incidence angle involved in ...

    • INVESTIGATION OF THE DYNAMIC BEHAVIOUR OF NON-UNIFORM THICKNESS CIRCULAR PLATES RESTING ON WINKLER AND PASTERNAK FOUNDATIONS 

      Autor: Salawu , Saheed; Sobamowo , Gbeminiyi; Sadiq , Obanishola
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The study of the dynamic behaviour of non-uniform thickness circular plate resting on elastic foundations is very imperative in designing structural systems. This present research investigates the free vibration analysis ...

    • IS PT-SYMMETRIC QUANTUM THEORY FALSE AS A FUNDAMENTAL THEORY? 

      Autor: Znojil , Miloslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Yi-Chan Lee et al. claim (cf. Phys. Rev. Lett. 112, 130404 (2014)) that the “recent extension of quantum theory to non-Hermitian Hamiltonians” (which is widely known under the nickname of “PT-symmetric quantum theory”) is ...

    • ISING MODEL SIMULATIONS AS A TESTBED OF NUCLEATION THEORY 

      Autor: Kulveit , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In this short review article we discuss the use of Ising lattice model as a testbed for improvement of theory of both homogeneous and heterogeneous nucleation theory. First we briefly overview the classical nucleation ...

    • ITINERARIES INDUCED BY EXCHANGE OF THREE INTERVALS 

      Autor: Masáková , Zuzana; Pelantová , Edita; Starosta , Štěpán
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      We focus on a generalization of the three gap theorem well known in the framework of exchange of two intervals. For the case of three intervals, our main result provides an analogue of this result implying that there are ...

    • ITINERARIES INDUCED BY EXCHANGE OF TWO INTERVALS 

      Autor: Masáková , Zuzana; Pelantová , Edita
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We focus on the exchange T of two intervals with an irrational slope α. For a general subinterval I of the domain of T, the first return time to I takes three values. We describe the structure of the set of return itineraries ...

    • 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 ...