Acta Polytechnica. 2018, vol. 58: Poslední příspěvky

Zobrazují se záznamy 21-40 z 51

    • APPLICATION OF CORROSION PLATES IN DRINKING WATER 

      Autor: Skalický , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Drinking water has always been, is and will be a strategic raw material. Stopping corrosion or at least minimisation of its impact while keeping quality drinking water supplies is a big challenge for the future. That is ...

    • HYDROPHOBIC IMPREGNATION OF GEOPOLYMER COMPOSITE BY ETHOXYSILANES 

      Autor: Mašek , Zdeněk; Diblikova , Linda
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      A geopolymer composite was impregnated by incorporating the hydrophobic alkyl group on the outer surface and in the inner structure of the geopolymer. Ethoxysilanes 1H,1H,2H,2H perfluoroctyltriethoxysilane and hexadecylt ...

    • PRIMARY PEAK RATIO CORRELATION TO THE MEASUREMENT ACCURACY OF PIV METHOD 

      Autor: Novotny , Jan; Machovska , Ilona
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      An estimation of a measurement accuracy at each measured point is crucial regarding the applicability of results of the measurements. The aim of this work is to determine the correlation between individual metrics and the ...

    • 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 ...

    • ANAEROBIC DIGESTION OF LANDFILL LEACHATE WITH NATURAL ZEOLITE AND SUGARCANE BAGASSE FLY ASH AS THE MICROBIAL IMMOBILIZATION MEDIA IN PACKED BED REACTOR 

      Autor: Sudibyo , Hanifrahmawan; Shabrina Lini, Zata; Wondah Rafih, Hartika; Hastuti Tri, Retno; Purnomo Wahyu, Chandra; Budhijanto , Wiratni
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      To enhance the digestion rate of a landfill leachate in the anaerobic packed bed reactor, a natural zeolite and sugarcane bagasse fly ash (BFA) were tested as the immobilization media. In order to scale up this process and ...

    • COMPARISON OF ACTUAL GROUND SETTLEMENTS IN TUNNELLING EXCAVATION TO MODEL PREDICTIONS 

      Autor: Saplachidi , Alexandra; Vougioukas , Emmanouil
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      It has been discovered that the underground structures are vulnerable to seismic phenomena mainly due to permanent ground deformations caused by earthquakes rather than the dynamic seismic movement itself. Several models ...

    • SURVEY OF SELECTED PROCEDURES FOR THE INDIRECT DETERMINATION OF THE GROUP REFRACTIVE INDEX OF AIR 

      Autor: Dvořáček , Filip
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The main aim of the research was to evaluate numeric procedures of the indirect determination of the group refractive index of air and to choose the suitable ones for requirements of ordinary and high accuracy distance ...

    • IMPROVEMENT OF MACHINE SAFETY DEVICES 

      Autor: Hevko Matviiovych, Bohdan; Hevko Bohdanovych, Roman; Klendii Mykolaivna, Oleksandra; Buriak Vasyliovych, Mykola; Dzyadykevych Volodymyrovych, Yurii; Rozum Ivanovych, Ruslan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article presents a development of new machine safety devices, which provide protection of operating elements from overload. Theoretical calculations have been made in order to determine the optimum design, kinematic ...

    • THERMOCHEMICAL CALCULATIONS USING SERVICEORIENTED ARCHITECTURE IN THE WEB SERVICE FORM 

      Autor: Horovčák , Pavel; Terpák , Ján
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The subject of this article is the service-oriented architecture utilization in the design and implementation of a web service that is intended to perform selected thermochemical calculations for chemical reactions. Computing ...

    • EXPERIMENTAL CHARACTERIZATION OF A MAGNETOHYDRODYNAMIC POWER GENERATOR UNDER DC ARC PLASMA 

      Autor: Ayeleso Oluwaseun, Ayokunle; Kahn T. E., Mohamed
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The generation of electric power through the conventional systems (thermal and hydroelectric) is no longer sufficient to meet the increasing industrial and commercial usage. Therefore, an alternative energy conversion ...

    • EFFECT OF IMPERATA CYLINDRICA REINFORCEMENT FORM ON THE TENSILE AND IMPACT PROPERTIES OF ITS COMPOSITES WITH RECYCLED LOW DENSITY POLYETHYLENE 

      Autor: Olusunmade Femi, Olusola; Bulus Emmanuel, Abba; Kashin Kelvin, Terwase
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Composites of recycled low-density polyethylene obtained from waste water-sachets and imperata cylindrica were produced with particulate and long-fibre unidirectional mat reinforcements. Comparison was made of the tensile ...

    • UPDATED VERSION OF THE SIMPLIFIED MODEL OF INTENSIVELY BLASTED ELECTRIC ARC 

      Autor: Senk , Josef; Laznickova , Ilona; Jakubova , Ivana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article deals with an improvement of a simplified model of intensively blasted electric arc burning in argon in an anode channel of a modular-type arc heater. Gradually gained experience in the application of the model ...

    • ANALYSIS OF DALLARA T12 RACE CAR FRONT WING VIBRATIONS 

      Autor: Sorokin Alekseevich, Pavel; Khryakov Stanislavovich, Kirill; Gommers , Michiel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This work investigates aerodynamic elements’ vibrations of high-speed vehicles on the example of the Dallara T12 race car front wing. Made up energy spectrums of wing vibrations for three specific cases arising during ...

    • THE TIME DIFFERENCE IN EMISSION OF LIGHT AND PRESSURE PULSES FROM OSCILLATING BUBBLES 

      Autor: Vokurka , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Oscillations of spark-generated bubbles are studied experimentally. In this work, an attention is paid to the time difference in the radiation of light flashes and pressure pulses from a bubble at the final stages of the ...

    • 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 ...

    • APPLICATION OF THE TEMPERATURE OSCILLATION METHOD IN HEAT TRANSFER MEASUREMENTS AT THE WALL OF AN AGITATED VESSEL 

      Autor: Solnař , Stanislav; Dostál , Martin; Petera , Karel; Jirout , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The Temperature Oscillation Infra-Red Thermography (TOIRT) was used to measure convective heat transfer coefficients at the inner vertical wall of an agitated and baffled vessel. Two impellers were used: an axial six-blade ...

    • STABILITY OF SYNTHESIZED SILVER NANOPARTICLES IN CITRATE AND MIXED GELATIN/CITRATE SOLUTION 

      Autor: Kavuličová , Jana; Mražíková , Anna; Velgosová , Oksana; Ivánová , Dana; Kubovčíková , Martina
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The study focuses on an investigation of the influence of both citrate and mixed gelatin/citrate as a reductant and stabilizer on the colloidal stability of silver nanoparticles (AgNPs)synthesized by a chemical reduction ...

    • OPTIMALIZATION OF PHOTOREACTOR GEOMETRY FOR THE CULTIVATION OF CHLAMYDOMONAS REINHARDTII 

      Autor: Fekete , Roman; Žáková , Terézia; Gabrišová , Ľudmila; Kotora , Peter; Peciar , Peter; Gahurová , Dominika; Slaninová , Miroslava
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      At the present time, a great attention is being paid to the use of algae. Algae can adapt to different conditions and can produce substances corresponding to responsible environments. The main problem in their cultivation ...

    • ŽAMPA’S SYSTEMS THEORY: A COMPREHENSIVE THEORY OF MEASUREMENT IN DYNAMIC SYSTEMS 

      Autor: Rychtáriková , Renata; Urban , Jan; Štys , Dalibor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article outlines in memoriam Prof. Pavel Žampa’s concepts of system theory which enable us to devise a measurement in dynamic systems independently of the particular system behaviour. From the point of view of Žampa’s ...

    • PARTICLE MOTION ON THE SURFACE OF A CONCAVE SOIL-TILLING DISK 

      Autor: Pylypaka , Serhii; Klendii , Mykola; Klendii , Oleksandra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Relative particle motion on the internal rough surface of a concave soil-tilling disk, which rotates around horizontal axis under a soil reaction force, has been considered. A disk blade is positioned in a vertical plane, ...