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A search for ultra-high-energy photons at the Pierre Auger Observatory exploiting air-shower universality
P. Savina, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2022, objavljeni znanstveni prispevek na konferenci

Opis: The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above ∼ 0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (Xmax) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1–10 EeV, a new analysis technique has been developed by combining the FD-based measurement of Xmax with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy.
Ključne besede: Pierre Auger Observatory, indirect detection, fluorescence detection, surface array, hybrid detection, ultra-high energy, cosmic rays, photons
Objavljeno v RUNG: 29.09.2023; Ogledov: 22; Prenosov: 0
.pdf Celotno besedilo (1,12 MB)
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Highlights from the Telescope Array experiment
R. Abbasi, Jon Paul Lundquist, 2022, objavljeni znanstveni prispevek na konferenci (vabljeno predavanje)

Opis: The Telescope Array (TA) is the largest cosmic ray observatory in the Northern Hemisphere. It is designed to measure the properties of cosmic rays over a wide range of energies. TA with it's low energy extension (TALE) observe cosmic-ray induced extensive air showers between 2 PeV and 100 EeV in hybrid mode using multiple instruments, including an array of scintillator detectors at the Earth's surface and telescopes to measure the fluorescence and Cerenkov light. The statistics at the highest energies is being enhanced with the ongoing construction of the TAx4 experiment which will quadruple the surface area of the detector. We review the present status of the experiments and most recent physics results on the cosmic ray anisotropy, chemical composition and energy spectrum. Notable highlights include a new feature in the energy spectrum at about 10^19.2 eV, and a new clustering of events in the direction of Perseus-Pisces supercluster above this energy. We also report on updated diffuse photon flux limits and new spectrum and composition results in the lower energy range from the TALE extension.
Ključne besede: Telescope Array, TALE, low energy extension, TAx4, indirect detection, hybrid detection, ground array, fluorescence detection, cerenkov light, ultra-high energy, cosmic rays, energy spectrum, composition, anisotropy
Objavljeno v RUNG: 26.09.2023; Ogledov: 55; Prenosov: 0
.pdf Celotno besedilo (6,75 MB)
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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.
Ključne besede: Zinc Oxide, MWCNT, hybrid nanofluid, thermal lens, diffusivity, engine efficiency
Objavljeno v RUNG: 30.06.2022; Ogledov: 773; Prenosov: 0
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Hybrid research between Art and Science : podMAST
2020, radijska ali televizijska oddaja, podkast, intervju, novinarska konferenca

Ključne besede: art thinking, artistic sensibility, born hybrid, collective filtering, video theory, transdisciplinary, organising research, research design, hybrid thinking, curatorship
Objavljeno v RUNG: 08.12.2020; Ogledov: 2123; Prenosov: 23
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Exploring innovation challenges through Art, Science and Technology : MAST SYMPOSIUM 2020
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
Ključne besede: hybrid, academy, symposium, art, innovation, science, technology, europe
Objavljeno v RUNG: 08.10.2020; Ogledov: 2009; Prenosov: 0
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