Procházení Acta Polytechnica. 2017, vol. 57 dle data publikování

Zobrazují se záznamy 21-40 z 56

    • OPTIMIZATION METHOD AND SOFTWARE FOR FUEL COST REDUCTION IN CASE OF ROAD TRANSPORT ACTIVITY 

      Autor: Kovács , György
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The transport activity is one of the most expensive processes in the supply chain and the fuel cost is the highest cost among the cost components of transportation. The goal of the research is to optimize the transport ...

    • 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 ...

    • IMPROVEMENT OF ENERGY CONSUMPTION IN SPECTRUM SENSING COGNITIVE RADIO NETWORKS USING AN EFFICIENT TWO STAGE SENSING METHOD 

      Autor: Abdullah Najem, Hikmat; Abed Sami, Hadeel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Cognitive radio (CR) is a wireless technology developed to improve the usage in the spectrum frequency. Energy consumption is considered as a big problem in this technology, especially during a spectrum sensing. In this ...

    • 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 ...

    • MODIFICATION OF POWDER MATERIAL BY COMPACTION PROCESSING 

      Autor: Peciar , Peter; Macho , Oliver; Eckert , Maroš; Kabát , Juraj; Gabrišová , Ľudmila; Kotora , Peter; Fekete , Roman; Peciar , Marián
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      There are different criteria for assessing the appropriateness of an agglomeration technology in the deployment processing of dry, fine and dirty dust burdening in the communal and working environment. Besides the benefit ...

    • THE IMPACT OF SELECTED PROCESSES AND TECHNOLOGICAL PARAMETERS ON THE GEOMETRY OF THE WELD POOL WHEN WELDING IN SHIELS GAS ATMOSPHERE 

      Autor: Bradáč , Josef; Moravec , Jaromír
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This paper is focused on welding with a consumable electrode in a gas shield atmosphere and its main aim is to show the influence of selected processes and technological parameters on the geometry of the weld pool in terms ...

    • FICTITIOUS DOMAIN METHOD FOR NUMERICAL SIMULATION OF INCOMPRESSIBLE VISCOUS FLOW AROUND RIGID BODIES 

      Autor: Beno , Matej; Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This article describes the method of efficient simulation of the flow around potentially many rigid obstacles. The finite element implementation is based on the incompressible Navier-Stokes equations using structured, ...

    • AERODYNAMIC LOAD OF AN AIRCRAFT WITH A HIGHLY ELASTIC WING 

      Autor: Schoř , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      In this article, a method for calculation of air loads of an aircraft with an elastic wing is presented. The method can predict a redistribution of air loads when the elastic wing deforms. Unlike the traditional Euler or ...

    • EXPERIMENTAL DETERMINATION OF TEMPERATURES IN SPARK GENERATED BUBBLES OSCILLATING IN WATER 

      Autor: Vokurka , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The surface temperatures of the plasma core in the final stages of the first contraction phase of spark-generated bubbles oscillating under ordinary laboratory conditions in a large expanse of water are determined ...

    • PARAMETERS EFFECTING FORCED VORTEX FORMATION IN BLADE PASSAGEWAY OF DYNAMIC AIR CLASSIFIER 

      Autor: Adamčík , Martin; Svěrák , Tomáš; Peciar , Peter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Air classification of particulate materials is a method of classifying particles into coarse and fine fractions based on their size, density, or shape. Performance of the rotor air classifier is affected by operating ...

    • RATIONALLY EXTENDED SHAPE INVARIANT POTENTIALS IN ARBITRARY D DIMENSIONS ASSOCIATED WITH EXCEPTIONAL Xm POLYNOMIALS 

      Autor: Yadav Kumar, Rajesh; Kumari , Nisha; Khare , Avinash; Mandal Prasad, Bhabani
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Rationally extended shape invariant potentials in arbitrary D-dimensions are obtained by using point canonical transformation (PCT) method. The bound-state solutions of these exactly solvable potentials can be written in ...

    • NEW SPECTRAL STATISTICS FOR ENSEMBLES OF 2 × 2 REAL SYMMETRIC RANDOM MATRICES 

      Autor: Kumar , Sachin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      We investigate spacing statistics for ensembles of various real random matrices where the matrix-elements have various Probability Distribution Function (PDF: f(x)) including Gaussian. For two modifications of 2 × 2 matrices ...

    • GENERATION OF TRANSPORT PATHS IN FRACTURED POROUS MEDIA 

      Autor: Říha , Jakub; Královcová , Jiřina
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      In this article, a method for generation of transport paths in combined equivalent porous media / discrete fracture network computational meshes is proposed as an alternative to a particle tracking method. It is based on ...

    • HEIGHT AND WIDTH PARAMETERS FOR ENSURING PASSAGE OF EXCESSIVE LOADS ON ROADS 

      Autor: Petrů , Jan; Křivda , Vladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The article deals with the problem of passage of excessive transports on the roads and ensuring the necessary height and width parameters for this transport in the Czech Republic. Currently is lack of regulations for the ...

    • APPROACHES TO THE GAS CONTROL IN UCG 

      Autor: Kačur , Ján; Kostúr , Karol
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Underground Coal Gasification represents an alternative for conventional coal mining. This technology is also less expensive than traditional mining. It is expected that coal will be an important energy source in the coming ...

    • ON THE COMMON LIMIT OF THE PT-SYMMETRIC ROSEN–MORSE II AND FINITE SQUARE WELL POTENTIALS 

      Autor: Kovács , József; Lévai , Géza
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Two PT-symmetric potentials are compared, which possess asymptotically finite imaginary components: the PT-symmetric Rosen-Morse II and the finite PT-symmetric square well potentials. Despite their different mathematical ...

    • STRENGHT AND DYNAMIC ANALYSIS OF A STRUCTURAL NODE LIMITING THE MULTI-OUTPUT GEAR MECHANISM 

      Autor: Kačalová , Mária; Pavlenko , Slavko
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The rapidly advancing technological development leads to designing and researching a new multi- output gear mechanism. The investigated new double-output gear mechanism has two output coaxial shafts located against the ...

    • IMPLEMENTATION OF 3D VOF TRACKING ALGORITHM BASED ON BINARY SPACE-PARTITIONING 

      Autor: Kolařík , Filip; Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The paper focuses on modelling free surface flow. The interface is modelled using the Volume-Of-Fluid method, where the advection of volume fractions is treated by a purely geometrical method. The novelty of the work lies ...

    • LAMBERT FUNCTION METHODs TO STUDY LASER DYNAMICS WITH TIME-DELAYED FEEDBACK 

      Autor: Joglekar N, Yogesh; Vemuri , Gautam; Wilkey , Andrew
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Time-delayed differential equations arise frequently in the study of nonlinear dynamics of lasers with optical feedback and because the analytical solution of such equations can be intractable, one resorts to numerical ...

    • FURTHER GENERALISATIONS OF THE KUMMER-SCHWARZ EQUATION: ALGEBRAIC AND SINGULARITY PROPERTIES 

      Autor: Sinuvasan , R; Krishnakumar , K; Tamizhmani , K M; Leach , PGL
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The Kummer–Schwarz Equation, 2y'y'''− 3(y'')2 = 0, has a generalisation, (n − 1)y(n−2)y(n) − ny(n−1)2 = 0, which shares many properties with the parent form in terms of symmetry and singularity. All equations of the class ...