Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 193-212 z 880

    • Contributions to the Study of Dynamic Absorbers, a Case Study 

      Autor: Balcau , Monica; Plesa , Angela; Opruta , Dan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Dynamic absorbers are used to reduce torsional vibrations. This paper studies the effect of a dynamic absorber attached to a mechanical system formed of three reduced masses which are acted on by one, two or three order x ...

    • Control Algorithms for Large-scale Single-axis Photovoltaic Trackers 

      Autor: Schneider , Dorian
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The electrical yield of large-scale photovoltaic power plants can be greatly improved by employing solar trackers. While fixed-tilt superstructures are stationary and immobile, trackers move the PV-module plane in order ...

    • CONTROL OF THE DOUBLE INVERTED PENDULUM ON A CART USING THE NATURAL MOTION 

      Autor: Neusser , Zdenek; Valášek , Michael
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper deals with controlling the swing-up motion of the double pendulum on a cart using a novel control. The system control is based on finding a feasible trajectory connecting the equilibrium positions from which the ...

    • Conversion of units of length from the Czech state standard to the geodetic baseline Javoriv 

      Autor: Lechner, Jiří; Kosarev, Nikolai Sergeevich; Trevoho, Igor Sergeevich
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      Modern society cannot do without high quality geospatial data. This need constantly strengthens with the growth of the information society and the emerging cyber society. Validity and quality of geospatial data is strongly ...

    • Corn starch doped with sodium iodate as solid polymer electrolytes for energy storage applications 

      Autor: Awang, Fatin Farhana; Hassan, Mohd Faiz; Kamarudin, Khadijah Hilmun
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The concern about environmental problems has inspired a of energy storage devices from natural sources. In this study, solid polymer electrolyte (SPE) films made from corn starch doped with different compositions of sodium ...

    • COULOMB SCATTERING IN NON-COMMUTATIVE QUANTUM MECHANICS 

      Autor: Gáliková , Veronika; Prešnajder , Peter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Recently we formulated the Coulomb problem in a rotationally invariant NC configuration space specified by NC coordinates xi, i = 1, 2, 3, satisfying commutation relations [xi, xj ] = 2iλεijkxk (λ being our NC parameter). ...

    • COUNTER-ROTATING DUAL ROTOR WIND TURBINE LAYOUT OPTIMISATION 

      Autor: Hetyei, Csaba; Szlivka, Ferenc
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      General energy demand is continuously increasing, thus the energy generating assets need to be optimised for higher efficiency. Wind turbines are no exception. Their maximum efficiency can be determined on a theoretical ...

    • COUPLED ELECTROMAGNETIC-THERMAL SIMULATION OF A POWER TRANSFORMER BY 3D FEM 

      Autor: Henriques , Henrique Oliveira; Vizeu , Carlos Eduardo; Souza , Paulo Cesar; Costa , Mauricio Caldora; Sotelo , Guilherme Gonçalves; Sousa , Jonaylton Moura; Fortes , Marcio Zamboti; Ferreira , Vitor Hugo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Power transformers are the most common equipment in an electric power system, which has been manufactured in the last decade. However, overheating can damage them, considerably reducing their operation lives, which may ...

    • COVARIANT INTEGRAL QUANTIZATIONS AND THEIR APPLICATIONS TO QUANTUM COSMOLOGY 

      Autor: Gazeau , Jean-Pierre
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      We present a general formalism for giving a measure space paired with a separable Hilbert space a quantum version based on a normalized positive operator-valued measure. The latter are built from families of density operators ...

    • CP VIOLATIONS (AND MORE) AFTER THE FIRST TWO YEARS OF LHCB 

      Autor: Auriemma, Giulio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The most interesting cosmological open problems, baryon asymmetry, dark matter, inflation and dark energy, are not explained by the standard model of particle physics (SM). The finalgoal of the Large Hadron Collider an ...

    • 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 ...

    • CRYPTO-HERMITIAN APPROACH TO THE KLEIN–GORDON EQUATION 

      Autor: Semoradova , Iveta
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      We explore the Klein-Gordon equation in the framework of crypto-Hermitian quantum mechanics. Solutions to common problems with probability interpretation and indefinite inner product of the Klein-Gordon equation are proposed.

    • CRYSTALLINE ADMIXTURES AND THEIR EFFECT ON SELECTED PROPERTIES OF CONCRETE 

      Autor: Pazderka, Jiří; Hájková, Eva
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      There have been many experimental measurements of the waterproofing ability and durability of concrete with a crystalline admixture, but some other important properties have not been reliably tested yet. The results of the ...

    • CURRENT WAYS TO HARVEST ENERGY USING A COMPUTER MOUSE 

      Autor: Horvat , Frantisek; Cekan , Michal; Soltes , Lukas; Biath , Peter; Hucko , Branislav; Jedinak , Igor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      This paper deals with the idea of an energy harvesting (EH) system that uses the mechanical energy from finger presses on the buttons of a computer mouse by means of a piezomaterial (PVF2). The piezomaterial is placed in ...

    • Cyclic response of RC beam-column joints strengthened with transverse steel bars and with C-FRP diagonal ties 

      Autor: Golias, Emmanouil; Vougioukas, Emmanouil A.; Wittemann, Klaus; Kalogeropoulos, George I.; Karayannis, Chris
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      The use of additional bars, internally placed through drill holes, in external beam-column connections subjected to cyclic loading, as shear reinforcement is experimentally investigated.The presented experimental work ...

    • CYCLIC STRESS ANALYSIS OF POLYESTER, ARAMID, POLYETHYLENE AND LIQUID CRYSTAL POLYMER YARNS 

      Autor: Vannucchi de Camargo , Felipe; Marcos Guilherme Eduardo, Carlos; Fragassa , Cristiano; Pavlovic , Ana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Mooring ropes used in offshore oil platforms are exposed to a set of extreme environmental conditions that can be crucial to their behaviour in service. Considering the elevated mechanical demands on these ropes imposed ...

    • CYCLIC TEMPERATURE LOADING RESIDUAL FLEXURAL STRENGHT OF REFRACTORY SLABS 

      Autor: Holčapek , Ondřej; Reiterman , Pavel; Konvalinka , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This paper describes the effect of cyclic elevated temperature loading on refractory slabs made from high performance, fibre reinforced cement composite. Slabs were produced from aluminous cement-based composites, reinforced ...

    • CYLINDRICAL ROLLER BEARING LUBRICATION REGIMES ANALYSIS AT LOW SPEED AND PURE RADIAL LOAD 

      Autor: Chmelař , Jakub; Petr , Karel; Mikeš , Petr; Dynybyl , Vojtěch
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      In this article, we describe a method of the roller bearing lubrication regime prediction. It uses a mathematical model of the bearing based on the standard ISO/TS 16281 to obtain the external load distribution over the ...

    • Czech Contribution to LOFT 

      Autor: Hudec , René; Petráček , Vojtěch; Šnita , Dalimil
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We describe the current status of the Czech contribution to the ESA LOFT space mission, with emphasis on technical aspects. Expertise available in the Czech Republic will play a positive role in the LOFT project and related ...

    • CZECH WW2 CONCRETE FORTIFICATIONS: CORROSION PROCESSES AND REMEDIATION METHOD BASED ON CRYSTALLIZING COATING 

      Autor: Pazderka, Jiří; Reiterman, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Concrete is a relatively new structural material, hence the remediation of concrete structures is very rare. There are a lot of concrete fortifications in the Czech Republic, which were built just before WW2. These bunkers ...