Prohlížení Acta Polytechnica. 2020, vol. 60 dle názvu

Zobrazují se záznamy 1-20 z 58

    • A combined strain element to functionally graded structures in thermal environment 

      Autor: Ton-That , Hoang Lan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Functionally graded materials are commonly used in a thermal environment to change the properties of constituent materials. They inherently withstand high temperature gradients due to a low thermal conductivity, core ...

    • A COMPARISON OF TWO MODAL ANALYSIS METHODS: AN IMPACT HAMMER VERSUS LASER VIBROMETRY 

      Autor: Krejčí , Jakub; Beneš , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper presents a comparative experimental-analytical study on the performance of Multi-Input Single-Output (MISO) and Single-Input Multi-Output (SIMO) techniques to identify the modal properties of a cantilever beam. ...

    • A NEW FASTENER TO ENSURE THE RELIABILITY OF A PASSENGER CAR BODY ON A TRAIN FERRY 

      Autor: Lovska, Alyona; Fomin , Oleksij
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      To ensure the strength of the passenger car bodies during transportation on train ferries, it is proposed to mount fastening elements of chain binders on the body bolster beams. The principle of such an element is based ...

    • Additive Laser Barcode Printing on High Reflective Stainless Steel 

      Autor: Mihalev , Mihail Stoyanov; Hardalov , Chavdar Momchilov; Christov , Christo Georgiev; Rinke , Monika; Leiste , Harald; Schneider , Johannes
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In this paper, the process of an additive laser marking on stainless steel parts for barcode printing is presented. It is based on the use of one transition metal oxide chemically-well bonded to the stainless steel substrate, ...

    • ANALYSES OF WASTE PRODUCTS OBTAINED BY LASER CUTTING OF AW-3103 ALUMINIUM ALLOY 

      Autor: Loskot , Jan; Zubko , Maciej; Janikowski , Zbigniew
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In the presented research, the methods of scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and transmission electron microscopy were applied to analyse the powder waste obtained by ...

    • ANALYSIS OF STATIC ANGLE OF REPOSE WITH RESPECT TO POWDER MATERIAL PROPERTIES 

      Autor: Macho , Oliver; Demková , Karin; Gabrišová , Ľudmila; Čierny , Matúš; Mužíková , Jitka; Galbavá , Paulína; Nižnanská , Žofia; Blaško , Jaroslav; Peciar , Peter; Fekete , Roman; Peciar , Marián
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper investigates the Angle of Repose (AoR) of powder materials with respect to their morphological and rheological properties. Glass beads, sand, flour and semolina of different particle sizes were used as the ...

    • ANALYTICAL SOLUTION OF (2+1) DIMENSIONAL DIRAC EQUATION IN TIME-DEPENDENT NONCOMMUTATIVE PHASE-SPACE 

      Autor: Haouam , Ilyas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In this article, we studied the system of a (2+1) dimensional Dirac equation in a time-dependent noncommutative phase-space. More specifically, we investigated the analytical solution of the corresponding system by the ...

    • APPLICATION OF FMEA METHODOLOGY FOR CHECKING OF CONSTRUCTION’S PROJECT DOCUMENTATION AND DETERMINATION OF THE MOST RISK AREAS 

      Autor: Tuháček , Martin; Franek , Ondřej; Svoboda , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The article deals with an innovative method designed to check project documentation of buildings at the design stage, specifically exploring the possibility to implement FMEA and PDCA methodologies. Based on performed ...

    • ARTIFICIAL NEURAL NETWORK APPROACH FOR THE IDENTIFICATION OF CLOVE BUDS ORIGIN BASED ON METABOLITES COMPOSITION 

      Autor: Rustam; Gunawan, Agus Yodi; Kresnowati, Made Tri Ari Penia
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper examines the use of an artificial neural network approach in identifying the origin of clove buds based on metabolites composition. Generally, large data sets are critical for an accurate identification. Machine ...

    • 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, ...

    • 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 ...

    • COMPLEXITY REDUCTION OF CYCLOSTATIONARY SENSING TECHNIQUE USING IMPROVED HYBRID SENSING METHOD 

      Autor: Abdullah , Hikmat N.; Dawood , Zinah O.; Abdelkareem , Ammar E.; Abed , Hadeel S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In cognitive radio system, the spectrum sensing has a major challenge in needing a sensing method, which has a high detection capability with reduced complexity. In this paper, a low-cost hybrid spectrum sensing method ...

    • 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 ...

    • DEFORMATION ANALYSIS OF LAYERED REINFORCED CONCRETE - FOAM CONCRETE FLOOR SLABS 

      Autor: Lytvyniak , Oksana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This article presents a theoretical study of a stress-strain state of layered reinforced concrete - foam concrete floor slabs (hereinafter called as the LRFCS), with the use of a deformation analysis. Compressive and tensile ...

    • DEVELOPMENT OF NUMERICAL MODELS FOR THE PREDICTION OF TEMPERATURE AND SURFACE ROUGHNESS DURING THE MACHINING OPERATION OF TITANIUM ALLOY (Ti6Al4V) 

      Autor: Daniyan , Ilesanmi; Tlhabadira , Isaac; Mpofu , Khumbulani; Adeodu , Adefemi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Temperature and surface roughness are important factors, which determine the degree of machinability and the performance of both the cutting tool and the work piece material. In this study, numerical models obtained from ...

    • EIGENVALUES EVALUATION OF GENERALLY DAMPED ELASTIC DISC BRAKE MODEL LOADED WITH NON-CONSERVATIVE FRICTION FORCE 

      Autor: Úradníček , Juraj; Musil , Miloš; Bachratý , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper deals with the evaluation of eigenvalues of a linear damped elastic two-degrees-of-freedom system under a non- onservative loading. As a physical interpretation of a proposed mathematical model, a simplified ...

    • ENERGY GAIN FROM ERROR-CORRECTING CODING IN CHANNELS WITH GROUPING ERRORS 

      Autor: Kuznetsov , Alexandr; Oleshko , Oleg; Kuznetsova , Kateryna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Abstract. This article explores the a mathematical model of the a data transmission channel with errors grouping. We propose an estimating method for energy gain from coding and energy efficiency of binary codes in channels ...

    • EXPERIMENTAL INVESTIGATION OF THE POZZOLANIC POTENTIALS OF MILLET AND RICE HUSK ASH AS MINERAL ADDITIVE IN SELF-COMPACTING CONCRETE 

      Autor: Wasiu , John; Oluwatosin , Fashina Ayoola
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Self-compacting concrete (SCC) is a new concept of concrete mix which flows in a formwork and consolidates itself without the need for compaction. Effectively compacting concrete can be very difficult especially in areas ...

    • EXTERNAL ROLLING OF A POLYGON ON CLOSED CURVILINEAR PROFILE 

      Autor: Kresan , Tetiana; Pylypaka , Serhii; Ruzhylo , Zynovii; Rogovskii , Ivan; Trokhaniak , Oleksandra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The rolling of a flat figure in the form of an equilateral polygon on a curvilinear profile is considered. The profile is periodic. It is formed by a series connection of an arc of a symmetrical curve. The ends of the arc ...

    • EXTRACTION AND EVALUATION OF OIL FROM GREEN ALGAE CLADOPHORA GLOMERATA BY HEXANE/ETHER MIXTURE 

      Autor: Yusuff , Adeyinka Sikiru; Ewere , Donatus
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The overall aim of this study was to grow green algae Cladophora glomerata, extract oil from it, and characterize the extracted oil to gain insight into its physicochemical properties. The effects of parameters affecting ...