Browsing Acta Polytechnica by Title

Now showing items 807-826 of 880

    • THE INFLUENCE OF THE FIBRES ARRANGEMENT ON HEAT TRANSFER AND PRESSURE DROP OF POLYMERIC HOLLOW FIBRE HEAT EXCHANGERS 

      Author: Kůdelová , Tereza; Kroulíková , Tereza; Astrouski , Ilya; Raudenský , Miroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Polymeric hollow fibre heat exchangers are the new alternative to common metal heat exchangers. These heat exchangers provide advantages, such as low weight, corrosion resistance, easy shaping and machining. Moreover, they ...

    • The Intriguing Nature of the Cataclysmic Variable SS Cygni 

      Author: Giovannelli , F.; Sabau-Graziati , L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The classification of SS Cyg as a dwarf nova (DN), a subclass of the non–magnetic (NM) cataclysmic variable (CV) has been considered by most of the community as well established because of a paper appeared in Nature (Bath ...

    • THE JEM-EUSO MISSION 

      Author: Bertaina, Mario; Ebisuzaki, Toshikazu; Galeotti, Piero; Kajino, Fumiyoshi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The JEM-EUSO mission explores the origin of the extreme energy cosmic rays (EECRs) above 50EeV and explores the limits of the fundamental physics, through the observations of their arrival directions and energies. It is ...

    • THE MASS COMPOSITION OF ULTRA HIGH ENERGY COSMIC RAYS 

      Author: Grillo, Aurelio F.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The status of the Mass Composition measurements of Ultra High Energy Cosmic Rays is presented, with emphasis on the results from the Fluorescence Detector of the Pierre Auger Observatory. Possible consequences of the present ...

    • THE NA62 EXPERIMENT AT CERN AND THE MEASUREMENT OF THE ULTRA-RARE DECAY K⁺→π⁺ v ̄v 

      Author: Antonelli, Antonella
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The NA62 experiment at CERN aims at the very challenging task of measuring with 10% relative error the Branching Ratio of the ultra-rare decay of the K+ into π+ ν¯ν which is expected to occur only in about 8 out of 1011 ...

    • THE NUMBER OF ORTHOGONAL CONJUGATIONS 

      Author: Uhlmann , Armin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      After a short introduction to anti-linearity, bounds for the number of orthogonal (skew) conjugations are proved. They are saturated if the dimension of the Hilbert space is a power of two. For other dimensions this is an ...

    • THE OPERATING LOAD OF A DISINTEGRATION MACHINE 

      Author: Beniak , Juraj; Križan , Peter; Matúš , Miloš; Kováčová , Monika
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The process of disintegration is affected by a large number of operating and design parameters which have not previously been described in detail. This paper discusses the effect of the disintegrative surface area on the ...

    • The Optical Transient Search in the Bamberg Southern Sky Survey: Preliminary Results 

      Author: Hudec , R.; Kopel , F.; Krapp , P.; Heber , U.; Cayé , W.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A large fraction of gamma-ray bursts temporarily emit optical light, i.e. optical afterglows and optical transients. So far, optical transients have only been detected after related gamma-ray satellite detection. However, ...

    • THE PAST AND THE FUTURE OF DIRECT SEARCH OF GW FROM PULSARS IN THE ERA OF GW ANTENNAS 

      Author: Milano, L.; Calloni, E.; De Rosa, R.; De Laurentis, M.; Di Fiore, L.; Garufi, F.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this paper we will give an overview of the past and present status of Gravitational Wave (GW) research associated with pulsars, taking into account the target sensitivity achieved from interferometric laser GW antennas ...

    • The Point Spread Function Variations inside Wide-field Astonomical Images 

      Author: Anisimova , Elena; Bednář , Jan; Páta , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Point Spread Function (PSF) of the astronomical imaging system is usually approximated by a Gaussian or Moffat function. For simplification, the astronomical imaging system is considered to be time and space invariant. ...

    • The Process of Plasma Chemical Photoresist Film Ashing from the Surface of Silicon Wafers 

      Author: Bordusau , Siarhei; Madveika , Siarhei; Dostanko , Anatolii
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      At present, the research for finding new technical methods of treating materials with plasma, including the development of energy and resource saving technologies for microelectronic manufacturing, is particularly actual.In ...

    • The Research on Atmospheric Pressure Water Vapour Plasma Generation and Application for the Destruction of Wastes 

      Author: Grigaitiene , Viktorija; Tamošiunas , Andrius; Valatkevičius , Pranas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In the Lithuanian Energy Institute an experimental atmospheric pressure Ar/water vapour plasma torch has been designed and tested. The power of plasma torch was estimated 40 ÷ 69 kW, the mean temperature of plasma jet at ...

    • THE SEARCH FOR BLAZARS AMONG THE UNIDENTIFIED EGRET gamma-RAY SOURCES 

      Author: Meintjes, Pieter J.; Nkundabakura, Pheneas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this paper we report the results of a multi-wavelength follow-up study of selected flat spectrum extragalactic radio-optical counterparts within the error boxes of 13 unidentified EGRET sources. Two of these previously ...

    • THE SENSITIVITY OF THE GREENHOUSE EFFECT TO CHANGES IN THE CONCENTRATION OF GASES IN PLANETARY ATMOSPHERES 

      Author: Bressler, Smadar; Shaviv, Giora; Shaviv, Nir J.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We present a radiative transfer model for Earth-Like-Planets (ELP). The model allows the assessment of the effect of a change in the concentration of an atmospheric component, especially a greenhouse gas (GHG), on the ...

    • THE SHMUSHKEVICH METHOD FOR HIGHER SYMMETRY GROUPS OF INTERACTING PARTICLES 

      Author: Bodner , Mark; Chadzitaskos , Goce; Patera , Jiří; Tereszkiewitz , Agnieszka
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      About 60 years ago, I. Shmushkevich presented a simple ingenious method for computing the relative probabilities of channels involving the same interacting multiplets of particles, without the need to compute the Clebsch-Gordan ...

    • The Simulation of the Influence of Water Remnants on a Hot Rolled Plate after Cooling 

      Author: Zahradník , Radek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In situations when a sheet metal plate of large dimensions is rolled, water remnants from cooling can be observed on the upper side of the plate. This paper focuses on deformations of a hot rolled sheet metal plate that ...

    • THE SUGGESTIONS AS TO THE CALCULATION BEARING CAPACITY OF SANDWICH REINFORCED CONCRETE — FOAMED CONCRETE FLOOR SLABS 

      Author: Lytvyniak , Oksana; Tashak , Myroslava
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This article presents the results of an experimental research of sandwich reinforced concrete-foamed concrete floor slabs. These floor slabs combine three different materials — normal concrete, foamed concrete and a steel ...

    • THE SZ EFFECT IN THE PLANCK ERA: ASTROPHYSICAL AND COSMOLOGICAL IMPACT 

      Author: Colafrancesco, Sergio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Sunyaev–Zel’dovich effect (SZE) is a relevant probe for cosmology and particle astrophysics. The Planck Era marks a definite step forward in the use of this probe for astrophysics and cosmology. Astrophysical applications ...

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

      Author: 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 ...

    • The Two-dimensional Harmonic Oscillator on a Noncommutative Space with Minimal Uncertainties 

      Author: Dey , Sanjib; Fring , Andreas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The two dimensional set of canonical relations giving rise to minimal uncertainties previously constructed from a q-deformed oscillator algebra is further investigated. We provide a representation for this algebra in terms ...