Prohlížení Acta Polytechnica. 2020, vol. 60 dle názvu

Zobrazují se záznamy 30-49 z 58

    • MODELING OF MATERIAL BALANCE FROM THE EXPERIMENTAL UCG 

      Autor: Durdán , Milan; Terpák , Ján; Kačur , Ján; Laciak , Marek; Flegner , Patrik
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The underground coal gasification is a continually evolving technology, which converts coal to calorific gas. There are many important parameters in this technology, which are difficult to measure. These parameters include ...

    • NATM TUNNELS – CONSIDERATION OF THE PARTLY DAMAGED PRIMARY LINING IMPACT FOR THE SECONDARY LINING EVALUATION 

      Autor: Trunda , Vlastislav; Hilar , Matouš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Tunnels excavated by the New Austrian Tunnelling Method (NATM) are traditionally supported by a double-shell lining. The primary lining is generated from reinforced sprayed concrete with rockbolts, the secondary lining is ...

    • NEURINGER-ROSEINWEIG MODEL BASED LONGITUDINALLY ROUGH POROUS CIRCULAR STEPPED PLATES IN THE EXISTENCE OF COUPLE STRESS 

      Autor: Vashi , Yoginibahen Devendrasinh; Patel , Rakesh Manilal; Deheri , Gunamani Biswanath
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This study intents to scrutinize the impact of ferrofluid in the presence of couple stress for longitudinally rough porous circular stepped plates. The influence of longitudinal surface roughness is developed using the ...

    • Newmark algorithm for dynamic analysis with Maxwell chain model 

      Autor: Schmidt , Jaroslav; Janda , Tomáš; Zemanová , Alena; Zeman , Jan; Šejnoha , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper investigates a time-stepping procedure of the Newmark type for dynamic analyses of viscoelastic structures characterized by a generalized Maxwell model. We depart from a scheme developed for a three-parameter ...

    • ON CFD INVESTIGATION OF RADIAL CLEARANCE OF LABYRINTH SEALS OF A TURBINE ENGINE 

      Autor: Čížek , Michal; Pátek , Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Fluid flow in labyrinth seals of a turbine engine is described. The aim is to describe numerical calculations of fluid flow in labyrinth seals and evaluate the calculated data for different settings of radial clearance of ...

    • ON THE SECOND LIGHT FLASH EMITTED FROM A SPARK-GENERATED BUBBLE OSCILLATING IN WATER 

      Autor: Vokurka , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The light emitted from the spark-generated bubbles oscillating in water is studied experimentally. Attention is paid to the emission of light from bubbles in the final stages of their first contraction and in the early ...

    • OPTIMIZATION OF A SMALL SOLAR CHIMNEY 

      Autor: Castro Silva , Janaina Oliveira; Maia , Cristiana Brasil
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      An optimization study to maximize the exergy efficiency of a small-scale solar chimney was carried out. Optimization variables include collector diameter (Dc), collector height (Hc), tower height (Ht), and tower diameter ...

    • OPTIMIZING EFFICIENCY OF THE COMBINED SEWER OVERFLOW CHAMBER HOBAS 

      Autor: Procházka, Jiří; Pollert, Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The paper deals with the design of swinging self-clean screen bars and the assessment of pressure losses in the combined sewer overflow chamber (HOBAS CSO Chamber), sold by the company HOBAS. The HOBAS CSO Chamber ensures ...

    • PARALLELIZATION OF ASSEMBLY OPERATION IN FINITE ELEMENT METHOD 

      Autor: Bošanský , Michal; Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The efficient codes can take an advantage of multiple threads and/or processing nodes to partition a work that can be processed concurrently. This can reduce the overall run-time or make the solution of a large problem ...

    • PERFORMANCE ANALYSIS OF QUADRATURE CHAOS SHIFT 

      Autor: Alabbasi , Hesham Adnan; Abboud , Izz Kadhum; Hasan , Fadhil Sahib
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      One of the most famous techniques of non-coherent differential chaos shift keying (DCSK) is Quadrature chaos shift keying (QCSK) system, this system suffered from lowering the data rate and increasing the bit energy during ...

    • PILE SETTLEMENT INDUCED FROM SOIL MOVEMENT DUE TO BREAKDOWN OF RETAINING WALL 

      Autor: Shukla , Rajesh Prasad
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Very few studies measured the settlement of retaining wall supported piles foundation under a soil movement. This study explores the pile settlement induced from the sudden breakdown of a closely located retaining wall ...

    • PROPERTIES OF A DIFFERENTIAL SEQUENCE BASED UPON THE KUMMER-SCHWARZ EQUATION 

      Autor: Maharaj , Adhir; Andriopoulos , Kostis; Leach , Peter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      In this paper, we determine a recursion operator for the Kummer-Schwarz equation, which leads to a sequence with unacceptable singularity properties. A different sequence is devised based upon the relationship between the ...

    • SENSITIVITY ANALYSIS OF INPUT PARAMETERS FOR LOAD CARRYING CAPACITY OF MASONRY ARCH BRIDGES 

      Autor: Vokál , Marek; Drahorád , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The article deals with an analysis of railway masonry arch bridges. Typical attributes of these bridges are pointing loss and backfill. Therefore, the material - masonry - behaviour can be described only by a non-linear ...

    • SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE 

      Autor: Davidová , Vendula; Reiterman , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The volume changes of cement based composites are significantly exhibited in the hardening process. Initial phases of the hardening are complemented by the expansion due to the heat evolution that is subsequently alternated ...

    • SIMILARITY SOLUTIONS AND CONSERVATION LAWS FOR THE BEAM EQUATIONS: A COMPLETE STUDY 

      Autor: Halder , Amlan Kanti; Paliathanasis , Andronikos; Leach , Peter Gavin Lawrence
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      We study the similarity solutions and we determine the conservation laws of various forms of beam equations, such as Euler-Bernoulli, Rayleigh and Timoshenko-Prescott. The travelling-wave reduction leads to solvable ...

    • STRUCTURE FROM MOTION PROCESSING OF ANALOGUE IMAGES CAPTURED BY ROLLEI METRIC CAMERA, DIGITIZED WITH VARIOUS SCANNING RESOLUTION 

      Autor: Dlesk , Adam; Vach , Karel; Pavelka , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      SfM processing of archived analogue images gives an opportunity to efficiently create new and valuable 2D and 3D results. The SfM processing of digitized analogue images brings some challenges. How to digitize negatives ...

    • STUDY ON MCNP6 MODEL IN THE CALCULATION OF KINETIC PARAMETERS FOR PEBBLE BED REACTOR 

      Autor: Zuhair,; Suwoto,; Setiadipura, Topan; Su'ud, Zaki
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      When conducting a nuclear reactor transient analysis, the most important parameter, called the kinetic parameter, is required. The calculation of kinetic parameters can be conducted using several methods. The deterministic ...

    • SUITABLE PRODUCTION TOOLS SELECTION WITH THE USE OF EVOLUTIONARY ALGORITHMS 

      Autor: Hynek , Petr; Kreibich , Viktor; Firt , Roman
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This paper deals with the use of a production equipment simulation in the design of production systems, more specifically the welding equipment in the automotive industry. Based on the simulation results, a matrix, which ...

    • TESTING OF GLUED JOINTS ON PLASTIC PARTS MANUFACTURED USING FFF TECHNOLOGY 

      Autor: Suder , Jiří; Vocetka , Michal; Kot , Tomáš; Fojtík , František; Fusek , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The article focuses on the testing of glued joints of plastic parts manufactured by 3D rapid prototyping, using the Fused Filament Fabrication technology. The first part of the article describes the suitability of using a ...

    • TESTING THE SUITABILITY OF THE EXTRUDED POLYSTYRENE (STYRODUR) APPLICATION IN THE TRACK SUBSTRUCTURE 

      Autor: Ižvolt , Libor; Dobeš , Peter; Mečár , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Extruded polystyrene (XPS) and its excellent thermal insulation properties have been known for over 60 years. Due to its thermal, mechanical, but also deformation properties, XPS has a universal application, not only in ...