Acta Polytechnica: Poslední příspěvky

Zobrazují se záznamy 1-20 z 944

    • The satellite SMILE – its prospects for observing cosmic sources 

      Autor: Šimon, Vojtěch; Hudec, René; Read, Andrew
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We describe the scientific potential of a Soft X-ray Imager (SXI) onboard the ESA–CAS satellite SMILE to study the activity of cosmic X-ray sources in the soft X-ray region and located in the fields planned to be observed ...

    • Correlation between X-ray and gamma data of Swift measurements 

      Autor: Racz, Istvan I.; Balazs, Lajos G.; Horvath, Istvan; Pinter, Sandor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      Several studies over the last two decades have used canonical correlation analysis (CCA) to study the relationships between main γ-ray (e.g. fluence, peak flux, and duration) and main X-ray (flux, decay and spectral index, ...

    • Nanosatellite X-ray lobster eye optics – measurement of optical performance 

      Autor: Tichý, Vladimír; Němcová, Šárka; Hudec, René; Míka, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      This paper presents the results of tests of a one-dimensional Schmidt lobster-eye prototype module. The optics benefits from the new technology used for the mechanical part which ensures accurate positioning of individual ...

    • Interstellar gas motions around massive star formation regions in the nearby dwarf galaxy DDO43 

      Autor: Pichler, Enikő; Koncz, Bendegúz; Gabányi, Krisztina É.; Joó, András Péter; Tóth, L. Viktor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      Areas of massive star formation are strongly influenced by stellar winds and supernovae, therefore, enhanced turbulent flows are expected. We analyse high-quality Karl G. Jansky Very Large Array observations of the neutral ...

    • A study of X-ray point sources in Heiles Clouds 1 and 2 

      Autor: Varga, Nóra; Joó, András Péter; Koncz, Bendegúz
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      Star formation takes place in the coldest parts of molecular clouds, beginning in the densest, collapsing regions of filaments. As pre-main sequence stars are luminous X-ray emitters, X-ray point sources can serve as ...

    • Mass growth of massive quiescent galaxies in the Illustris TNG simulation 

      Autor: Koncz, Bendegúz; Joó, András Péter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      Interactions between galaxies could potentially lead to increased rates of star formation within these galaxies, potentially leading to the occurrence of multiple core-collapse supernovae and the ejection of hot gas. ...

    • The spatial distribution of GRBs 

      Autor: Bagoly, Zsolt; Balazs, Lajos G.; Horvath, Zsuzsa; Horvath, Istvan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We analysed the different aspects of the spatial distribution of 542 Gamma-Ray Bursts with precisely determined positions and spectroscopic redshifts. The data were divided according to the origin of the redshift (afterglow ...

    • STDweb: simple transient detection pipeline for the web 

      Autor: Karpov, Sergey
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We present a simple web-based tool, STDWeb, for a quick-look photometry and transient detection in astronomical images. It tries to implement a self-consistent and mostly automatic data analysis workflow that would work ...

    • Review: the landscape of gravitational wave astronomy 

      Autor: Poggiani, Rosa
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      The direct detection of gravitational waves from a binary black hole merger has opened a new window in observational astronomy. The first three observing runs of the LIGO/Virgo groundbased interferometers have produced a ...

    • 3U CubeSat mechanical design and subsystems 

      Autor: Karkun, Mohammad Suhel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      In this paper, an in-depth analysis of the mechanical design and integration of the 3U CubeSat subsystems is presented, a common form factor in the small satellite community. The study summarises recent research and ...

    • Astronomy events at Aschaffenburg University to attract future students 

      Autor: Döhring, Thorsten; Stanik, Eva; Zeising, Sebastian; Meissner, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      In 2023 the German Federal Ministry of Education and Research and the German organization for science communication “Wissenschaft im Dialog” jointly proclaimed a "Science Year 2023" in Germany with the motto “Our Universe”. ...

    • The two-point correlation function of the GRBs 

      Autor: Bagoly, Zsolt
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We analysed the spatial distribution of 542 GRBs with measured position and spectroscopic redshift up to 31 Aug 2022. Using kernel smoothing, we determined the GRB’s Sky Exposure Function and used it in the generation of ...

    • High-resolution mapping of secondary cosmic rays with miniaturised stacked pixel telescope 

      Autor: Granja, Carlos; Chanal, Herve; Zach, Václav; Chvátil, David; Oancea, Cristina; Poklop, Dušan; Olšanský, Václav; Jakůbek, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We performed detailed measurements of the secondary cosmic ray field in the lower atmosphere (at 200 m). We use a miniaturised particle telescope consisting of two closely stacked synchronised Timepix3 detectors. Position-, ...

    • Czech contribution to AHEAD2020: novel/alternative X-ray optics 

      Autor: Hudec, René; Maršíková, Veronika; Inneman, Adolf; Oberta, Peter; Pína, Ladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We briefly present selected results in the field of X-ray optics obtained within the project at the CTU in Prague in collaboration with other Czech Institutes, mainly Rigaku Prague, where X-ray optics modules were assembled. ...

    • Early steep optical decay linked to reverse shock for GRB200131A 

      Autor: Jelínek, Martin; Novotný, Filip; Klose, Sylvio; Stecklum, Bringfried; Maleňáková, Alžběta; Štrobl, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      We observed an optical afterglow of GRB200131A obtaining the first photometric point 63 s after the satellite trigger. This early observation shows a steep decay, suggesting either internal engine activity or a reverse ...

    • Gamma-ray bursts and optical brightness: insights from Swift satellite 

      Autor: Racz, Istvan I.; Nehme, Yasmin; Balazs, Lajos G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2025)
      During the examination of optical properties of gamma-ray bursts (GRBs) measured during the life of the Neil Gehrels Swift Observatory satellite, significant discoveries were made. While the satellite measures gamma, X-ray, ...

    • CO2 capture in pilot-scale unit using solid adsorbent in biomass fluidised bed boiler flue gas 

      Autor: Dvořák, Michael; Hrdlička, Jan; Pilař, Lukáš; Skopec, Pavel; Burda, Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      The search for methods to capture carbon dioxide (CO2) emissions from solid fuel combustion processes has led to the development and subsequent testing of alternative innovative CO2 capture technologies. Vacuum Pressure ...

    • Anchor test and long-term monitoring of grouted anchors instrumented with Fiber Bragg Grating sensing technology 

      Autor: Runcziková, Daniela; Záleský, Jan; Záleský, Marek; Koller, Jakub; Šašek, Ladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      Geotechnical monitoring of anchors provides fundamental data for analysis and evaluation to ensure safe environment. The use of optic fiber sensing technology, especially Fiber Bragg Gratings, brings many advantages of ...

    • Assessment of the effects of UV-A exposure on the mechanical strength of offshore mooring multifilaments 

      Autor: da Cruz, Daniel Magalhães; Stumpf, Felipe Tempel; Vassoler, Jakson Manfredini; Guilherme, Carlos Eduardo Marcos
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      The offshore industry faces significant challenges in the dynamic energy and maritime domain, necessitating robust engineering solutions for mooring systems. This study investigates the impact of ultraviolet radiation A ...

    • Settlement of piles with negative skin friction: design approaches according to part 3 of Eurocode 7 

      Autor: Zemanová, Alena; Anderle, Vojtěch; Masopust, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      Piles offer an effective solution for supporting structures in challenging ground conditions. However, ground settlement around deep foundations can induce negative skin friction, adding complexity to the geotechnical ...