Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 139-158 z 880

    • 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 ...

    • Change of Pressing Chamber Conicalness at Briquetting Process in Briquetting Machine Pressing Chamber 

      Autor: Križan , Peter; Matúš , Miloš; Kers , Jaan; Vukelić , Djordje
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In this paper, we will present the impact of the conical shape of a pressing chamber, an important structural parameter. Besides the known impact of the technological parameters of pressing chambers, it is also very important ...

    • CHANGES IN THE SURFACE LAYER OF ROLLED BEARING STEEL 

      Autor: Zemčík , Oskar; Sedlák , Josef; Chladil , Josef
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      This paper describes changes observed in bearing steel due to roller burnishing. Hydrostatic roller burnishing was selected as the most suitable method for performing roller burnishing on hardened bearing steel. The ...

    • CHAOTISED POLYMERIC HOLLOW FIBRE BUNDLE AS A CROSSFLOW HEAT EXCHANGER IN AIR-WATER APPLICATION 

      Autor: Kroulíková , Tereza; Astrouski , Ilya; Raudenský , Miroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Fifteen years ago, polymeric hollow fibre heat exchangers were presented for the first time. Nowadays there are not only the shell-and-tube types as there were at the beginning. In this paper, six chaotised polymeric hollow ...

    • Characterization of Human Gait using Fuzzy Logic 

      Autor: Kutilek , Patrik; Viteckova , Slavka; Svoboda , Zdenek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In medical practice, there is no appropriate widely-used application of a system based on fuzzy logic for identifying the lower limb movement type or type of walking. The object of our study was to determine characteristics ...

    • CHARACTERIZATION OF RECYCLED LINEAR DENSITY POLYETHYLENE/IMPERATA CYLINDRICA PARTICULATE COMPOSITES 

      Autor: Olusunmade Femi, Olusola; Zechariah , Sunday; Yusuf Ayotunde, Taofeek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Water-sachets made from low density polyethylene (LDPE) form a bulk of plastic wastes which creates environmental challenges, while certain species of plants like Imperata cylindrica constitute large portion of weeds on ...

    • CHARACTERIZATION OF SELECTED PROPERTIES OF COMPOSITES OF WASTE PAPER WITH UNTREATED BAMBOO STEM FIBRE AND RICE HUSK 

      Autor: Yusuf Ayotunde, Taofeek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Composite technology is an excellent approach to utilizing natural fibres and agricultural wastes, which constitute an environmental nuisance. Efforts are being made to characterize the properties of composites produced ...

    • Checking the Geometric Accuracy of a Machine Tool for Selected Geometric Parameters 

      Autor: Janásek , Adam; Čep , Robert; Brychta , Josef
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with the control parameters for selected geometric accuracy measurements for a machine tool. The parameters were needed after a refurbished milling machine was purchased. After setting up the machine, it ...

    • CHIMNEY RESERVOIRS: UNIQUE TECHNICAL STRUCTURES FROM THE FIRST HALF OF THE 20TH CENTURY IN THE CZECH REPUBLIC 

      Autor: Vonka , Martin; Kořínek , Robert
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In the past, various methods and technological systems were used to supply water on industrial and other sites. In the early 19th century, Professor Otto Intze invented a new form of water reservoir that could be installed ...