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Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeV
J. P. Lundquist, R.U. Abbasi, 2010, izvirni znanstveni članek

Opis: We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (Xmax), for air shower events collected by the High-Resolution Fly’s Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d⟨Xmax⟩/d[log(E)] of 47.9 ± 6.0 (stat) ± 3.2 (syst) g/cm^2/decade for energies between 1.6 and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4×10^18 eV.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Cosmic rays, Energy spectrum, Telescope Array, Hybrid, Ultra high energy...
Ključne besede: Cosmic rays, Energy spectrum, Telescope Array, Hybrid, Ultra high energy
Objavljeno: 27.04.2020; Ogledov: 1650; Prenosov: 0
.pdf Polno besedilo (314,89 KB)

Study of UHECR Composition Using Telescope Array's Middle Drum Detector and Surface Array in Hybrid Mode
J. P. Lundquist, 2016, objavljeni znanstveni prispevek na konferenci

Opis: The seven year Telescope Array (TA) Middle Drum hybrid composition measurement shows agreement between Ultra-High Energy Cosmic Ray (UHECR) data and a light composition obtained with QGSJetII-03 or QGSJet-01c models. The data are incompatible with a pure iron composition, for all models examined, for energies log10(E/eV)>18.4. This is consistent with previous TA results. This analysis is presented using an updated version of the pattern recognition analysis (PRA) technique developed by TA.
Najdeno v: ključnih besedah
Ključne besede: UHECR, cosmic rays, hybrid detection, composition
Objavljeno: 29.04.2020; Ogledov: 1507; Prenosov: 58
.pdf Polno besedilo (150,19 KB)

Energy spectrum of ultra-high energy cosmic rays observed with the Telescope Array using a hybrid technique
J. P. Lundquist, T. Abu-Zayyad, 2015, izvirni znanstveni članek

Opis: We measure the spectrum of cosmic rays with energies greater than eV with the fluorescence detectors (FDs) and the surface detectors (SDs) of the Telescope Array Experiment using the data taken in our first 2.3-year observation from May 27, 2008 to September 7, 2010. A hybrid air shower reconstruction technique is employed to improve accuracies in determination of arrival directions and primary energies of cosmic rays using both FD and SD data. The energy spectrum presented here is in agreement with our previously published spectra and the HiRes results.
Najdeno v: ključnih besedah
Ključne besede: Ultra-high energy cosmic rays, Telescope Array, Hybrid spectrum
Objavljeno: 30.04.2020; Ogledov: 1743; Prenosov: 0
.pdf Polno besedilo (267,06 KB)

Direct measurement of the muonic content of extensive air showers between 2 × 10[sup]17 and 2 × 10[sup]18 eV at the Pierre Auger Observatory
Lukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, A. Aab, 2020, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...showers, Pierre Auger Observatory, underground muon detectors, hybrid detection, muonic content in air showers...
Ključne besede: ultra-high energy cosmic rays (UHECRs), extensive air showers, Pierre Auger Observatory, underground muon detectors, hybrid detection, muonic content in air showers
Objavljeno: 24.08.2020; Ogledov: 1464; Prenosov: 50
.pdf Polno besedilo (1,41 MB)

Exploring innovation challenges through Art, Science and Technology
Tere Badia, Peter Purg, Vivianne Hoffman, Michela Magas, Marko Peljhan, prispevek na konferenci brez natisa

Opis: The goal of the panel discussion was to bring together policy makers, artists and academics, to debate about the interdisciplinary challenges of open innovation in the interface of the Arts, Sciences and Technologies. Artists and designers shape another relationship between science, technology, and human beings, this dialogue stimulates innovation centred on transversal competencies and unconventional thinking. The combination of artistic research and participatory design strategies is key to find divergent approaches to sustainable development of science and technology, and to transform their social and economic impact. It is necessary to create a context of possibility for the development of skills, knowledge and tools from experimental and collaborative environments, as well as research methods in art, social sciences, sciences and technology, and cultural studies. The discussion focussed on critical, ethical and sustainable ways of cross-collaboration between art-science-technology and the available and needed policy instruments to develop collaboration between artists, academia and industry. Participating speakers: Viviane Hoffman – Deputy Director-General for Education, Youth, Sport and Culture, European Commission Barbara Stacher – European Commission, DG EAC, Cultural Policy Unit Michela Magas – Innovation catalyst who bridges the worlds of science and art, design and technology, more Marko Peljhan – Media artist, professor and entrepreneur – new media arts and technology, more Peter Purg – Assoc. Prof. PhD, University of Nova Gorica School of Arts, MAST project leader Moderated by: Tere Badia, Culture Action Europe
Najdeno v: ključnih besedah
Povzetek najdenega: ... hybrid, academy, symposium, art, innovation, science, technology, europe...
Ključne besede: hybrid, academy, symposium, art, innovation, science, technology, europe
Objavljeno: 08.10.2020; Ogledov: 1386; Prenosov: 0
.pdf Polno besedilo (161,91 KB)

Development of Zinc Oxide-Multi-Walled Carbon Nanotube hybrid nanofluid for energy-efficient heat transfer application: A thermal lens study
SWAPNA MOHANACHANDRAN NAIR SINDHU, 2021, izvirni znanstveni članek

Opis: This paper addresses the need for developing an energy-efficient hybrid nanofluid with zinc oxide–multi-walled carbon nanotube (ZnO-MWCNT) for overcoming the bottleneck of efficient heat transfer in thermal systems. The concentration-dependent thermal diffusivity modifications are analyzed using the highly sensitive mode mismatched thermal lens technique. The hybrid composite is prepared by the solid-state mixing and annealing of a pure multi-walled carbon nanotube (MWCNT) and zinc oxide (ZnO), synthesized by the solution combustion method. The composite formation is studied by structural, morphological, and optical characterization techniques. Among the three nanofluids ZnO, MWCNT, and ZnO-MWCNT, the composite exhibits a drastic enhancement in thermal diffusivity at a lower solid volume fraction of 0.047 mg/ml containing 0.009 mg/ml of MWCNT. All the nanofluids show an optimum concentration beyond which the thermal diffusivity decreases with the nanoparticle concentration. Thus, this study suggests the potential application of ZnO-MWCNT hybrid nanofluids in thermal system design to enhance internal combustion engines' efficiency during cold-start.
Najdeno v: ključnih besedah
Ključne besede: Zinc Oxide, MWCNT, hybrid nanofluid, thermal lens, diffusivity, engine efficiency
Objavljeno: 30.06.2022; Ogledov: 127; Prenosov: 0
.pdf Polno besedilo (2,44 MB)

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