Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 131-150 z 880

    • BACK TO BASICS: TOWARDS NOVEL COMPUTATION AND ARRANGEMENT OF SPATIAL SENSORY IN IMAGES 

      Autor: Wen , Wei; Khatibi , Siamak
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      The current camera has made a huge progress in the sensor resolution and the lowluminance performance. However, we are still far from having an optimal camera as powerful as our eye is. The study of the evolution process ...

    • BATHYMETRY FROM WORLDVIEW-3 SATELLITE DATA USING RADIOMETRIC BAND RATIO 

      Autor: Parente , Claudio; Pepe , Massimiliano
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The use of optical satellite sensors allows to obtain bathymetry data on large area ina short time and in a cheap way. In addition, in particular places where it is difficult to carry out the survey by classic methods, the ...

    • Bearing capacity of damaged reinforced concrete beams strengthened with metal casing 

      Autor: Karpiuk, Irina; Danilenko , Denis; Karpiuk, Vasyl; Danilenko , Anna; Lyashenko, Tatiana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Experimental data on the bearing capacity of damaged reinforced concrete beams with the dimensions of 2000×200×100 mm, reinforced with prestressed metal casings, are presented. Damaging in the form of through normal and ...

    • BETA CANTOR SERIES EXPANSION AND ADMISSIBLE SEQUENCES 

      Autor: Caalim , Jonathan; Demegillo , Shiela
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      We introduce a numeration system, called the beta Cantor series expansion, that generalizes the classical positive and negative beta expansions by allowing non-integer bases in the Q-Cantor series expansion. In particular, ...

    • BEYOND THE STANDARD MODEL OF THE DISC–LINE SPECTRAL PROFILES FROM BLACK HOLE ACCRETION DISCS 

      Autor: Sochora , Vjaceslav; Karas , Vladimír; Svoboda , Jirí; Dovciak , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The strong gravitational field of a black hole has distinct effects on the observed profile of a spectral line from an accretion disc near a black hole. The observed profile of the spectral line is broadened and skewed by ...

    • Biomass Gasification — Primary Methods for Eliminating Tar 

      Autor: Lisý , Martin; Baláš , Marek; Moskalík , Jiří; Štelcl , Otakar
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This present paper deals with primary methods for reducing tar in biomass gasification, namely by feeding a natural catalyst into a fluidized bed. This method is verified using an experimental pilot plant.

    • BIPERIODIC FIBONACCI WORD AND ITS FRACTAL CURVE 

      Autor: Ramírez Luis, José; Rubiano Nevardo, Gustavo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In this paper, we introduce a word-combinatorial interpretation of the biperiodic Fibonacci sequence. We study some properties of this new family of infinite words. Moreover,  we associate to this family of words a family ...

    • BOOTES Observation of GRB 080603B 

      Autor: Jelínek , M.; Gorosabel , J.; Castro-Tirado , A. J.; Postigo , A. de Ugarte; Guziy , S.; Cunniffe , R.; Kubánek , P.; Prouza , M.; Vítek , S.; Hudec , R.; Reglero , V.; Sabau-Graziati , L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We report on multicolor photometry of long GRB080603B afterglow from BOOTES-1B and BOOTES-2. The optical afterglow has already been reported to present a break in the optical lightcurve at 0.12 ± 0.2 days after the trigger. ...

    • CALCULATION OF STRESS AND DEFORMATION IN FUEL ROD CLADDING DURING PELLET-CLADDING INTERACTION 

      Autor: Halabuk , Dávid; Martinec , Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The elementary parts of every fuel assembly, and thus of the reactor core, are fuel rods. The main function of cladding is hermetic separation of nuclear fuel from coolant. The fuel rod works in very specific and difficult ...

    • Calculation of the Inductance of Plasma Column at PF-1000 Device with Assumed Current Distribution 

      Autor: Kortanek , Jiri; Kubes , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Processed data is taken from the D-D fusion reaction experiments on PF-1000 at IFPILM Warsaw, operating with 2 MA, 1011 neutron yield, using interferometry, temporal resolved neutron diagnostics, magnetic probe diagnostics ...

    • CALCULATIONS OF ION TRAJECTORIES AT MAGNETOPLASMA SEPARATION AND EXPERIMENTS WITH POLYATOMIC GASES 

      Autor: Yuferov , Vladimir; Shariy , Sergey; Tkachova , Tetiana; Katrechko , Vyacheslav; Svichkar , Alexander; Ilichova , Vira; Shvets , Mykhailo; Mufel , Evgen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Calculated trajectories of ions with different masses, indicating the possibility of a mixture separation, are obtained. Comparative experiments for plasma of monatomic and polyatomic gases (Ar, N2, CO2), upon combination ...

    • CAN ONE REALLY STUDY CHAOS ANALYTICALLY? 

      Autor: Lee Howard, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      One generally thinks that chaos can be studied only numerically by aid of the computer. It is however suggested by the theorem of Sharkovskii and Li and Yorke that in Id continuous maps analytical studies are possible. How ...

    • Case study: Dosimetric comparison of VMAT, IMRT and 3DCRT techniques for left-sided breast cancer treated in deep inspiration breath-hold 

      Autor: Hanušová, Tereza
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      The aim of this case study was to compare 3D conformal radiotherapy (3DCRT) plans for patients treated for left-sided breast cancer (whole breast without positive lymph nodes in deep inspiration breath-hold (DIBH)) to ...

    • Cavitation wear of Eurofer 97, Cr18Ni10Ti and 42HNM alloys 

      Autor: Rostova, Hanna; Voyevodin, Victor; Vasilenko, Ruslan; Kolodiy, Igor; Kovalenko, Vladimir; Marinin, Vladimir; Zuyok, Valeriy; Kuprin, Alexander
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The microstructure, hardness and cavitation wear of Eurofer 97, Cr18Ni10Ti and 42HNM have been investigated. It was revealed that the cavitation resistance of the 42HNM alloy is by an order of magnitude higher than that ...

    • CELL-CENTERED LAGRANGIAN LAX-WENDROFF HLL HYBRID SCHEME ON UNSTRUCTURED MESHES 

      Autor: Fridrich, David; Liska, Richard; Tarant, Ivan; Váchal, Pavel; Wendroff, Burton
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      We have recently introduced a new cell-centered Lax-Wendroff HLL hybrid scheme for Lagrangian hydrodynamics [Fridrich et al. J. Comp. Phys. 326 (2016) 878-892] with results presented only on logical rectangular quadrilateral ...

    • CFD ANALYSIS OF THE SPACER GRIDS AND MIXING VANES EFFECT ON THE FLOW IN THE CHOSEN PART OF THE TVSA-T FUEL ASSEMBLY 

      Autor: Juklíček , Jakub; Železný , Václav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      CFD is a promising and widely spread tool for a flow simulation in nuclear reactor fuel assemblies. One of the limiting factors is the complicated geometry of a spacer grid. It leads to the computational mesh with high ...

    • CFD modelling of a secondary settling tanks: generalization based on database relations 

      Autor: Švanda, Ondřej; Pollert, Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      The modelling of a secondary settling tank area using numerical methods has been quite extensively explored and researched by numerous authors and papers. These developed models utilize different approaches, from efforts ...

    • CFD SIMULATION OF A STIRRED DISHED BOTTOM VESSEL 

      Autor: Vlček , Petr; Skočilas , Jan; Jirout , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper deals with simulation of the fluid flow in a stirred curved-bottom vessel equipped with three curved blade impellers. The power number and the impeller flow rate number are dimensionless characteristics of the ...

    • CFD simulation of partial channel blockage on plate-type fuel of TRIGA-2000 conversion reactor core 

      Autor: Dibyo, Sukmanto; Luthfi, Wahid; Pinem, Surian; Irianto, Ign Djoko; Sriwardhani, Veronica Indriati
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      A nuclear reactor cooling system that has been operating for a long time can carry some debris into a fuel coolant channel, which can result in a blockage. An in-depth two-dimensional simulation of partial channel blockage ...

    • CFD SIMULATION OF THE HEAT TRANSFER PROCESS IN A CHEVRON PLATE HEAT EXCHANGER USING THE SST TURBULENCE MODEL 

      Autor: Skočilas , Jan; Palaziuk , Ievgen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      This paper deals with a computational fluid dynamics (CFD) simulation of the heat transfer process during turbulent hot water flow between two chevron plates in a plate heat exchanger. A three-dimensional model with the ...