Browsing Acta Polytechnica. 2021, vol. 61, no.4 by Title

Now showing items 1-9 of 9

    • CO2 power cycle chemistry in the CV Řež experimental loop 

      Author: Berka, Jan; Ballek, Jakub Vojtěch; Velebil, Ladislav; Purkarová, Eliška; Vagenknechtová, Alice; Hlinčík, Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Power cycles using carbon dioxide in a supercritical state (sc-CO2) can be used in both the nuclear and non-nuclear power industry. These systems are characterized by their advantages over steam power cycles, e. g., the ...

    • Corn starch doped with sodium iodate as solid polymer electrolytes for energy storage applications 

      Author: Awang, Fatin Farhana; Hassan, Mohd Faiz; Kamarudin, Khadijah Hilmun
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The concern about environmental problems has inspired a of energy storage devices from natural sources. In this study, solid polymer electrolyte (SPE) films made from corn starch doped with different compositions of sodium ...

    • Detailed modelling and analysis of digital mho distance relay with single-pole operation 

      Author: Pinheiro, Paulo Henrique Barbosa de Souza; Santos, Mayara Helena Moreira Nogueira; Colombini, Angelo Cesar; França, Bruno Wanderley; Fortes, Marcio Zamboti
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper introduces a methodology for modelling a digital admittance-type distance relay using PSCAD/EMTDC. The proposed distance relay was tested in a simulation of the Brazilian power grid with predetermined fault ...

    • On a static and dynamic calibration of thermochromic liquid crystals 

      Author: Solnař, Stanislav; Medek, Jan; Suleiman, Abubakar Shola; Vyhlídal, Patrik
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The paper deals with a static and dynamic calibration of selected wide-range thermochromic liquid crystals (TLC - SolarDust 24C), which are very easy to ingest and can provide accurate information on the temperature ...

    • Performance characteristics of Hopkinson’s set-up pneumatic launcher 

      Author: Sobczyk, Kamil; Kruszka, Leopold; Chmielewski, Ryszard; Rekucki, Ryszard
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The paper presents a performance characteristics of a pneumatic launcher, which is an important element of the split Hopkinson bar set-up (SHPB) at the Department of Military Engineering and Infrastructure (the Military ...

    • Simulation of laser drilling of Inconel X-750 and Ti-5Al-2.5Sn sheets using COMSOL 

      Author: Hanon, Muammel M.; Taha, Ziad A.; Zsidai, László
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This study aims to investigate the simulation of laser drilling processes on Inconel X-750 and Ti-5Al-2.5Sn sheets. To this end, COMSOL Multiphysics 5.2 software was employed to carry out the virtual experiments. A JK 701 ...

    • Stationary solutions of incompressible viscous flow in a wall-driven semi-circular cavity 

      Author: Erturk, Ercan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Stationary numerical solutions of incompressible viscous flow inside a wall-driven semicircular cavity are presented. After a conformal mapping of the geometry, using a body-fitted mesh, the Navier-Stokes equations are ...

    • Use of thermal analysis for the detection of calcium oxalate in selected forms of plastering exposed to the effects of Serpula lacrymans 

      Author: Cígler Žofková, Drahomíra; Frankl, Jiří; Frankeová, Dita
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The article discusses the interaction of metabolic products of a wood-destroying fungus of the dry rot species (Serpula lacrymans (Wulfen) P. Karst.) with a commonly used lime mortar. Mortar samples used in the presented ...

    • Utilization of agricultural waste adsorbent for the removal of lead ions from aqueous solutions 

      Author: Yusuff, Adeyinka Sikiru; Popoola, Lekan Taofeek; Anochie, Victor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This work investigated the potentiality of using chemically modified onion skin waste (CMOSW) as an adsorbent for the removal of lead ions (Pb2+) from an aqueous solution. The material properties were characterized using ...