Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 456-475 z 880

    • 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 ...

    • Load carrying capacity of masonry arch railway bridges at the serviceability limit state 

      Autor: Vokál, Marek; Drahorád, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      This article focuses on masonry arch railway bridges. The main topic is the algorithm, which was developed for the purpose of a non-linear arch bridge analysis. The sensitivity analysis of the input parameters of the ...

    • Local Magnetohydrodynamic Characteristics of the Plasma Stream generated by MPC 

      Autor: Cherednychenko , Tatyana N.; Garkusha , Igor E.; Chebotarev , Vladimir V.; Solyakov , Dmytro G.; Petrov , Yuriy V.; Ladygina , Maryna S.; Eliseev , Dmytro V.; Chuvilo , Alexander A.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper investigates the spatial distributions of electrical current which flows inside the plasma stream generated by a magnetoplasma compressor (MPC). Two different modes of MPC operation with different gas supply ...

    • LOCAL VELOCITY PROFILES MEASURED BY PIV IN AN VESSEL AGITATED BY RUSHTON TURBINE 

      Autor: Šulc , Radek; Pešava , Vít; Ditl , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The hydrodynamics and flow field were measured in an agitated vessel using 2-D Time Resolved Particle Image Velocimetry (2-D TR PIV). The experiments were carried out in a fully baffled cylindrical flat bottom vessel 300 ...

    • Long-Lived Plasma Process, Created by Impulse Discharge in Micro-Disperse Droplet Environment 

      Autor: Olszewski , Serge; Lisitchenko , Tamara; Yukhymenko , Vitalij
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The processes of organic compound (phenol and cation-active surfactants) destruction in water solutions, which stay under the influence of plasma treatment have been investigated in different dynamic plasma-liquid systems ...

    • Low earth orbit nanosatellite: influence of heat dissipation on passive thermal analysis 

      Autor: Akka, Amine; Benabdelouahab, Farid; Yerrou, Randa
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      The use of small satellites in ambitious missions presents challenges related to thermal breakdowns as one of the critical issues contributing to their failure. Heat dissipation and thermal management are still the major ...

    • LOW LEAKAGE CHARGE RECYCLING TECHNIQUE FOR POWER MINIMIZATION IN CNTFET CIRCUITS 

      Autor: Kavitha , Manickam; Kalpana M., Alagar
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Carbon Nanotube Field Effect Transistor (CNTFET) is one of the most promising candidates in the near future for digital design due to its better electrostatics and higher mobility characteristics. Parameters that determine ...

    • LOW-MASS BINARY X-RAY SOURCES: MONITORING WITH VARIOUS SATELLITES 

      Autor: Šimon , Vojtěch
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We show the importance of observing low-mass binary (LMXB) X-ray sources with the X-ray monitors onboard satellites. This enables us to study the physical processes governing the longterm activity of LMXBs. They are excellent ...

    • Luiza: Analysis Framework for GLORIA 

      Autor: Żarnecki , Aleksander Filip; Piotrowski , Lech Wiktor; Mankiewicz , Lech; Małek , Sebastian
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Luiza analysis framework for GLORIA is based on the Marlin package, which was originally developed for data analysis in the new High Energy Physics (HEP) project, International Linear Collider (ILC). The HEP experiments ...

    • MAGNETRON SPUTTERING WITH HOT SOLID TARGET: THERMAL PROCESSES AND EROSION 

      Autor: Borduleva Olegovna, Alena; Bleykher Alekseevna, Galina; Sidelev Vladimirovich, Dmitrii; Krivobokov Pavlovich, Valeriy
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      This work focuses on erosion and thermal processes taking place on the surface of the titanium target in magnetron sputtering. The study was carried out using magnetron sputtering systems (MSS) with different thermal ...

    • Marine diesel engines operating cycle simulation for diagnostics issues 

      Autor: Minchev, Dmytro S.; Varbanets, Roman A.; Alexandrovskaya, Nadiya I.; Pisintsaly, Ludmila V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The ongoing monitoring of marine diesel engines helps to detect the deviations of its parameters early and prevent major failures. But the experimental diagnostics data are generally limited, so frequently, it isn’t possible ...

    • 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. ...

    • Materials for Fusion Applications 

      Autor: Matějíček , Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      An overview of materials foreseen for use or already used in fusion devices is given. The operating conditions, material requirements and characteristics of candidate materials in several specific application segments are ...