Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 674-693 z 880

    • RESIDUAL PROPERTIES OF FIBER-REINFORCED REFRACTORY COMPOSITES WITH A FIRECLAY FILLER 

      Autor: Jogl , Marcel; Reiterman , Pavel; Holčapek , Ondřej; Koťátková , Jaroslava; Konvalinka , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      The aim of our study was to develop a composite material for industrial use that is resistant to the effect of high temperatures. The binder system based on aluminous cement was modified by adding finely-ground ceramic ...

    • Resistance Spot Welding of dissimilar Steels 

      Autor: Kolařík , Ladislav; Sahul , Miroslav; Kolaříková , Marie; Sahul , Martin; Turňa , Milan; Felix , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents an analysis of the properties of resistance spot welds between low carbon steel and austenitic CrNi stainless steel. The thickness of the welded dissimilar materials was 2 mm. A DeltaSpot welding gun ...

    • RESONANCES ON HEDGEHOG MANIFOLDS 

      Autor: Exner , Pavel; Lipovský , Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We discuss resonances for a nonrelativistic and spinless quantum particle confined to a two- or three-dimensional Riemannian manifold to which a finite number of semiinfinite leads is attached. Resolvent and scattering ...

    • RESONANT SWITCH MODEL OF HF QPOS AND EQUATIONS OF STATE OF NEUTRON STARS AND QUARK STARS 

      Autor: Stuchlík , Zdenek; Urbanec , Martin; Kotrlová , Andrea; Török , Gabriel; Goluchová , Katerina
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The mass and spin estimates of the 4U 1636−53 neutron star obtained by the Resonant Switch (RS) model of high-frequency quasi-periodic oscillations (HF QPOs) are tested by a large variety of equations of state (EoS) governing ...

    • RESPONSE OF HIGH-PERFORMANCE FIBRE REINFORCED CONCRETE REINFORCED BY TEXTILE REINFORCEMENT TO IMPACT LOADING 

      Autor: Vogel, Filip; Holčapek, Ondřej; Konvalinka, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Generally, cement composites like high-performance concrete (HPC) are very brittle. The resistance to the impact loading of the HPFRC and the HPFRC reinforced by the textile reinforcement are compared in this article. The ...

    • RESULTS FROM LHCF EXPERIMENT 

      Autor: Tricomi, Alessia
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The LHCf experiment has taken data in 2009 and 2010 p–p collisions at LHC at √s = 0.9TeV and √s = 7TeV. In this paper the most up-to-date results on the inclusive photon spectra and the π0 spectra measured by LHCf are ...

    • RESULTS FROM THE XENON100 EXPERIMENT 

      Autor: Persiani, Rino
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The XENON program consists in operating and developing double-phase time projection chambers using liquid xenon as the target material. It aims to directly detect dark matter in the form of WIMPs via their elastic scattering ...

    • Results of research on backlash compensation in a power electric drive by low-power electronic device 

      Autor: Samsonovich, Semen L.; Fedotov, Boris K.; Rozhnin, Nikolay B.; Goryunov, Roman V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      This article considers the feasibility of restoring and maintaining the kinematic accuracy of the support-rotary device drives by introducing a backlash compensation device into the control system. The power electromechanical ...

    • Reverse engineering of pump as turbine for CFD analysis 

      Autor: Souček, Jiří; Bílková, Eva; Nowak, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      Reverse engineering (RE) using 3D scanning is already a relatively technologically simple and cost-effective method. For water turbines, this is particularly true for RE of larger machines. With microturbines, there is a ...

    • ROBUST CONTROL OF END-TIDAL CO₂ USING THE H∞ LOOP-SHAPING APPROACH 

      Autor: Pomprapa, Anake; Misgeld, Berno; Sorgato, Verónica; Stollenwerk, André; Walter, Marian; Leonhardt, Steffen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Mechanically ventilated patients require appropriate settings of respiratory control variables to maintain acceptable gas exchange. To control the carbon dioxide (CO₂ ) level effectively and automatically, system identification ...

    • RX-J0852−4622: THE NEAREST HISTORICAL SUPERNOVA REMNANT – AGAIN 

      Autor: Aschenbach, Bernd
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      RX-J0852−4622, a supernova remnant, is demonstrated to be closer than 500 pc, based on the measurements of the angular radius, the angular expansion rate and the TeV g-ray flux. This is a new method of limiting the distance ...

    • S5 1803+78 Revisited 

      Autor: Nesci , R.; Maselli , A.; Montagni , F.; Sclavi , S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic ...

    • SEARCH FOR DARK MATTER WITH GAMMA-RAYS: A REVIEW 

      Autor: Morselli, Aldo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Successfully launched in June 2008, the Fermi Gamma-ray Space Telescope, formerly named GLAST, has been observing the high-energy gamma-ray sky with unprecedented sensitivity inthe 20MeV ÷ 300 GeV energy range and electrons ...

    • SEARCH FOR GRAVITATIONAL WAVES FROM SUPERNOVAE AND LONG GRBS 

      Autor: van Putten, Maurice H.P.M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We report on evidence for black hole spindown in the light curves of the BATSE catalogue of 1491 long GRBs by application of matched filtering. This observation points to a strong interaction of the black hole with surrounding ...

    • SEARCH FOR ISOLATED BLACK HOLES: PAST, PRESENT, FUTURE 

      Autor: Karpov , Sergey; Beskin , Grigory; Plokhotnichenko , Vladimir
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The critical property of a black hole is the presence of an event horizon. It may be detected only by means of a detailed study of the emission features of its surroundings. The temporal resolution of such observations has ...

    • SEGMENTING TAGGED CARDIAC MRI DATA USING A LOCAL VARIANCE FILTER 

      Autor: Oberhuber , Tomáš; Kučera , Slavomír; Loucký , Jakub; Súkupová , Lucie; Tintěra , Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present a new method for segmenting tagged MRI data. It is based on the observation that the tagging grid vanishes almost immediately inside the ventricles because of the blood flow. Segmentation can be therefore driven ...

    • Self tunning filter for three levels four legs shunt active power filter with fuzzy logic controller 

      Autor: Djendaoui, Dahmane; Benaissa, Amar; Rabhi, Boualaga; Zellouma, Laid
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The low harmonic distortion and reduced switching losses are the advantages of using the multilevel inverter. For this purpose, the three-level inverter is used in this paper as a three-phase four-leg shunt active power ...

    • Self-interference cancellation in underwater acoustic communications systems using orthogonal pilots in IBFD 

      Autor: Naman, Hala A.; Abdelkareem, Ammar E.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      This paper proposes a Self-interference (SI) cancellation system model of Underwater acoustic (UWA) communication for in-band full-duplex (IBFD) technology. The SI channel is separated from the Far channel by exploiting a ...

    • Semi-analytical approach-based studies of the squeeze film lubrication between rough porous annular discs: Rabinowitsch fluid model 

      Autor: Rahul, Amit Kumar; Singh, Manoj Kumar; Tiwari, Ravi; Paul, Sourabh; Rao, Pentyala Srinivasa; Biswas, Rohahn
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      In recent years, there has been much interest in the effects of porosity and surface roughness (SR) or geometric irregularities between two moving plates under hydrodynamic lubrication. Porous bearings are used extensively ...

    • SEMICLASSICAL ASYMPTOTICS OF EIGENVALUES FOR NON-SELFADJOINT OPERATORS AND QUANTIZATION CONDITIONS ON RIEMANN SURFACES 

      Autor: Esina I., Anna; Shafarevich I., Andrei
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      This paper reports a study of the semiclassical asymptotic behavior of the eigenvalues of some nonself-adjoint operators that are important for applications. These operators are the Schrödinger operator with complex periodic ...