Browsing Acta Polytechnica by Title

Now showing items 715-734 of 880

    • SPECIFIC FEATURES OF THE OXYFUEL COMBUSTION CONDITIONS IN A BUBBLING FLUIDIZED BED 

      Author: Skopec, Pavel; Hrdlička, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Oxyfuel combustion is a promising approach for capturing CO2 from power plants. This technology produces a flue gas with a high concentration of CO2. Our paper presents a verification of the oxyfuel combustion conditions ...

    • Spectral Analysis of Schrödinger Operators with Unusual Semiclassical Behavior 

      Author: Exner , Pavel; Barseghyan , Diana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this paper we discuss several examples of Schrödinger operators describing a particle confined to a region with thin cusp-shaped ‘channels’, given either by a potential or by a Dirichlet boundary; we focus on cases when ...

    • Spectral Singularities do not Correspond to Bound States in the Continuum 

      Author: Mostafazadeh , Ali
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We show that, contrary to a claim made in arXiv:1011.0645, the von Neumann-Winger bound states that lie in the continuum of the scattering states are fundamentally different from Naimark’s spectral singularities.

    • STABILITY OF BOSE-EINSTEIN CONDENSATES IN A PT-SYMMETRIC DOUBLE-δ POTENTIAL CLOSE TO BRANCH POINTS 

      Author: Löhle, Andreas; Cartarius, Holger; Haag, Daniel; Dast, Dennis; Main, Jörg; Wunner, Günter Wunner
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      A Bose-Einstein condensate trapped in a double-well potential, where atoms are incoupled to one side and extracted from the other, can in the mean-field limit be described by the nonlinear Gross-Pitaevskii equation (GPE) ...

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

      Author: 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 ...

    • STABILIZATION TIME AS AN IMPORTANT PARAMETER AFTER DENSIFICATION OF SOLID BIOFUELS 

      Author: Križan , Peter; Matúš , Miloš; Beniak , Juraj; Kováčová , Monika
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The aim of this paper is to present some preliminary results from experimental research on the densification process of solid high-grade biofuels. The findings presented in this paper contribute to an investigation of the ...

    • STATIC TESTS OF UNCONVENTIONAL PROPULSION UNITS FOR ULTRALIGHT AIRPLANES 

      Author: Helmich , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      This paper presents static tests of a new unconventional propulsion unit for small aviation airplanes. Our laboratory stand – a fan drive demonstrator – enables us to compare various design options. We performed experiments ...

    • Stationary and Dynamical Solutions of the Gross-Pitaevskii Equation for a Bose-Einstein Condensate in a PT symmetric Double Well 

      Author: Cartarius , Holger; Dast , Dennis; Haag , Daniel; Wunner , Günter; Eichler , Rüdiger; Main , Jorg
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We investigate the Gross-Pitaevskii equation for a Bose-Einstein condensate in a PT symmetric double-well potential by means of the time-dependent variational principle and numerically exact solutions. A one-dimensional ...

    • 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 ...

    • STATISTICAL PROPERTIES OF GRB AFTERGLOW PARAMETERS AS EVIDENCE OF COSMOLOGICAL EVOLUTION OF THEIR HOST GALAXIES 

      Author: Beskin , Gregory; Oganesyan , Gor; Greco , Giuseppe; Karpov , Sergey
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The results of a study of 43 peaked R-band light curves of optical counterparts of gamma-ray bursts with known redshifts are presented. The parameters of optical transients were calculated in the comoving frame, and then ...

    • Stator current signal crossing for fault diagnosis of self-excited induction generators 

      Author: Belynda, Fares; Abdelli, Radia; Bouzida, Ahcene
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      This paper presents a novel method for modelling and diagnosis of electrical and mechanical faults in fixed-Speed Self-Excited Induction Generators (SEIGs) operating in autonomous mode in a small-scale wind energy system. ...

    • Status and Perspectives of the Mini-MegaTORTORA Wide-field Monitoring System with High Temporal Resolution 

      Author: Karpov , Sergey; Beskin , Grigory; Bondar , Sergey; Perkov , Alexey; Ivanov , Evgeny; Guarnieri , Adriano; Bartolini , Corrado; Greco , Giuseppe; Shearer , Andy; Sasyuk , Vyacheslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Here we briefly summarize our long-term experience of constructing and operating wide-field monitoring cameras with sub-second temporal resolution to look for optical components of GRBs, fast-moving satellites and meteors. ...

    • STATUS OF THE CUORE EXPERIMENT 

      Author: Tomei, Claudia
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay of 130Te, a rare nuclear process that, if observed, would demonstrate the Majorana nature of the ...

    • Steel Fibre Reinforced Concrete for Tunnel Lining – Verification by Extensive Laboratory Testing and Numerical Modelling 

      Author: Beňo , Jaroslav; Hilar , Matouš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The use of precast steel fibre reinforced concrete (SFRC) for tunnel segments is a relatively new application of this material. It was first applied in Italy in the 1980s. However, it did not begin to be widely applied ...

    • Stimulated Raman Backscattering in Plasma — a Promising Tool for the Generation of Ultra-High Power Laser Beams 

      Author: Turčičová , Hana; Huynh , Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In the last fifteen years stimulated Raman backscattering (SRBS) in plasma has been intensively elaborated as a promising tool on the way towards high intense lasers. There are several advantages of this technique in ...

    • STIRRED FLUIDIZED-BED DRYER OF REGENERATED ION EXCHANGER PARTICLES 

      Author: Pěnička , Michal; Hoffman , Pavel; Fořt , Ivan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      This article describes intensification of the fluidized-bed drying process for regenerated spherical-shape ion exchanger particles in the batch mode, achieved by a mechanical stirrer in the fluidized bed layer of the dried ...

    • Stone Topography – Useful Tool in Monuments Restoration Process 

      Author: Cihla, Michal; Kovářová, Kateřina; Malát, Richard; Valach, Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      The surface of building stone on historic buildings often bears the original traces of craftsmanship processing. These are an integral part of the visual appearance of the monument and thus its value, which needs to be ...

    • STRATEGIC MODULATION OF THERMAL TO ELECTRICAL ENERGY RATIO PRODUCED FROM PV/T MODULE 

      Author: Aminou Moussavou, Anges A.; Raji, Atanda K.; Adonis, Marco
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Several strategies have been developed to enhance the performance of a solar photovoltaicthermal (PV/T) system in buildings. However, these systems are limited by the cost, complex structure and power consumed by the pump. ...

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

      Author: 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 ...

    • STRESS ANALYSIS AND TOPOLOGY OPTIMIZATION OF A CHAIN BUCKET ELEVATOR USING ANSYS 

      Author: Yin, Edward; Seckley, Emmanuel M.; Asiedu, Evans Kesse; Cobbinah, Stephen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      A failure of conveyor chain links in a production process can cause unscheduled shutdowns, which increase the throughput time coupled with damaged buckets and chain links, which increase maintenance and repair costs. Since ...