Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 799-818 z 880

    • THE IMPACT OF SUZAKU MEASUREMENTS ON ASTROPARTICLE PHYSICS 

      Autor: Ota, Naomi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Results from the Suzaku X-ray broad-band observations of clusters of galaxies are summarized. Aiming at understanding the physics of gas heating/particle acceleration and the cluster dynamical evolution, we search for ...

    • The impact of the air temperature on measuring the zenith angle during the year in the ground layer of the atmosphere for the needs of engineering surveying 

      Autor: Suk, Tomáš; Štroner, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper presents the results of over a year-long experiment dealing with a temperature measurement to calculate the theoretical effect of the atmosphere on the measured zenith angle in engineering surveying. The ...

    • THE INFLUENCE OF BASALT MINERALS AS CEMENT SUBSTITUTION MATERIALS IN MORTAR 

      Autor: Amin , Muhammad; Birawidha , David Candra; Isnugroho , Kusno; Hendronursito , Yusup; Sumardi , Slamet; Ario , Septa; Syafriadi , Syafriadi; Al-Muttaqii , Muhammad
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This study was conducted to determine the effect of the concentration of basalt as a cement substitution material in mortar. Basalt was analysed by XRD and XRF. From the XRD results, the diffractogram shows the dominant ...

    • THE INFLUENCE OF CUTTING CONDITIONS ON THE SELECTED PARAMETERS OF THE SURFACE INTEGRITY 

      Autor: Čep , Robert; Malotová , Šárka; Lichovník , Jiří; Hatala , Michal; Legutko , Stanislaw
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article deals with an investigation of residual stress in machined surface under conditions of high-feed milling and determination of the influence of machining conditions on the size and types of stress resulting from ...

    • THE INFLUENCE OF FRICTION STIR WELDED PROCESS PARAMETERS OF AA2519-T62 ON JOINT QUALITY DEFINED BY NON-DESTRUCTIVE LASER AMPLIFIED ULTRASONIC METHOD AND BY MICROSTRUCTURE ANALYSIS 

      Autor: Kravcov , Alexander; Kosturek , Robert; Śnieżek , Lucjan; Kluczyński , Janusz; Franek , Ondřej; Morozov , Nikolaj; Maciejewski , Pawel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The presented research contains a description of a non-destructive laser ultrasound internal structure analysis of aluminium joints made by friction stir welding. In the research, four selected technological parameter ...

    • The Influence of Nitrogen in Ar+N2 Mixture on Parameters of High-Temperature Device with Electric Arc 

      Autor: Jakubova , Ivana; Senk , Josef; Laznickova , Ilona
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The paper presents the results of numerous experiments carried out on a high temperature device consisting of an arc heater with intensively blasted electric arc and reaction chambers connected to its output. The influence ...

    • THE INFLUENCE OF SILVER NANOPARTICLES SYNTHESIS ON THEIR PROPERTIES 

      Autor: Mražíková , Anna; Velgosová , Oksana; Kavuličová , Jana; Krum , Stanislav; Málek , Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Application of green methods to replace physical and chemical methods for synthesis of silver nanoparticles (AgNPs) has become necessary not only from economic aspect but especially due to its significant impact on ecosystem. ...

    • THE INFLUENCE OF SIZE FRACTION ON THE COMPRESSIBILITY OF PINE SAWDUST AND THE EFFECTIVENESS CRITERION FOR DENSIFICATION 

      Autor: Matúš , Miloš; Križan , Peter; Kováčová , Monika; Beniak , Juraj
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Particulate matter from biomass, e.g. wood sawdust, is very diverse. The basic parameter describing the densification process of particulate matter is its compressibility, quantified by the coefficient of compressibility. ...

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

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 

      Autor: 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 ...