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Crossing Art, Science and Technology for Innovations through Maker Culture and Education
Kristina Pranjić, Peter Purg, Jernej Čuček Gerbec, 2022, objavljeni znanstveni prispevek na konferenci

Ključne besede: Cross-innovation, art thinking, making, interdisciplinary, embodiment, art practice, crafting, innovation, art-sci-tech
Objavljeno v RUNG: 06.03.2023; Ogledov: 576; Prenosov: 0
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Speckle interferometric investigation of argon pressure-induced surface roughness modifications in RF-sputtered MoO[sub]3 film
S. Soumya, R. Arun Kumar, S. Sreejyothi, Vimal Raj, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman, 2021, izvirni znanstveni članek

Opis: Film quality analysis is of more considerable signifcance due to its diversifed applications in various felds of technology. The present work reports the speckle interferometric analysis of the argon pressure-induced surface roughness modifcations of RF sputtered MoO3 flms. The paper suggests a new method of surface quality analysis of thin flms through a parameter δ, which is the diference between the initial and fnal inertia moment values in the study of the thermal-induced dynamic speckle pattern. The limitations of root mean square surface roughness analysis of the atomic force microscopic image of the flms is also exemplifed. The research suggests that argon pressure plays a vital role in the surface property of RF sputtered flms and also that the dynamic speckle analysis can give precise information about the quality of flms. The contour plot of particle displacement vector under thermal stress, suggests the degree of uniformity in the distribution of particles in the flm.
Ključne besede: speckle pattern interferometry, time history of speckle pattern, cross correlation, inertia moment
Objavljeno v RUNG: 04.07.2022; Ogledov: 705; Prenosov: 0
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Fractal and inertia moment analyses for thin film quality monitoring
Swapna Mohanachandran Nair Sindhu, 2022, izvirni znanstveni članek

Opis: The widespread applications of thin films in optronics demand innovative techniques for its characterizations. The work reported here proposes electronic speckle pattern interferometry and fractal-based methods for assessing the quality of thin films taking the industrially relevant molybdenum oxide (MoO3) incorporated niobium oxide (Nb2O5) films. The films with different levels of MoO3 incorporation (1, 2, 3, 5, and 10 wt. %) are prepared by radio frequency sputtering. The study reveals the structure modifications of Nb2O5 from the orthorhombic to monoclinic phases with an associated morphological variation revealed through atomic force microscopy and field-emission scanning electron microscopy analyses. The films’ specklegrams are recorded under thermal stress; the inertia moment (IM) and fractal analyses are computed and compared with the root-mean-square surface roughness of the films. The lacunarity analysis of the AFM films agrees well with the specklegrams. Thus, the lower IM and lacunarity values of the specklegrams can be regarded as indicators of the good quality of thin films.
Ključne besede: cross-correlation, fractal dimension, inertia moment, lacunarity, speckle, surface roughness.
Objavljeno v RUNG: 30.06.2022; Ogledov: 721; Prenosov: 0
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Crossing over from digital practices to media arts and into social innovation : School of Arts, University of Nova Gorica (SI)
Kristina Pranjić, Peter Purg, 2022, objavljeni povzetek strokovnega prispevka na konferenci

Ključne besede: cross-innovation, art thinking, making, crafting, art-sci-tech
Objavljeno v RUNG: 20.06.2022; Ogledov: 862; Prenosov: 5
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Crossing art, science and technology for innovations through maker culture and education
Peter Purg, Kristina Pranjić, Jernej Čuček Gerbec, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: cross-innovation, art thinking, making, crafting, art-sci-tech
Objavljeno v RUNG: 20.06.2022; Ogledov: 847; Prenosov: 5
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Measurement of the proton-air cross section with Telescope Array's Black Rock Mesa and Long Ridge fluorescence detectors, and surface array in hybrid mode
R. U. Abbasi, Mitsuhiro Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, Jon Paul Lundquist, 2020, izvirni znanstveni članek

Opis: Ultra high energy cosmic rays provide the highest known energy source in the universe to measure proton cross sections. Though conditions for collecting such data are less controlled than an accelerator environment, current generation cosmic ray observatories have large enough exposures to collect significant statistics for a reliable measurement for energies above what can be attained in the lab. Cosmic ray measurements of cross section use atmospheric calorimetry to measure depth of air shower maximum (Xmax), which is related to the primary particle’s energy and mass. The tail of the Xmax distribution is assumed to be dominated by showers generated by protons, allowing measurement of the inelastic proton-air cross section. In this work the proton-air inelastic cross section measurement, σ_inel_p−air, using data observed by Telescope Array’s Black Rock Mesa and Long Ridge fluorescence detectors and surface detector array in hybrid mode is presented. σ_inel_p−air is observed to be 520.1 ± 35.8 [Stat.] +25.0 −40 [Sys.] mb at √s = 73 TeV. The total proton-proton cross section is subsequently inferred from Glauber formalism and is found to be σ_tot_pp = 139.4 +23.4−21.3[Stat.] +15.0−24.0[Sys.] mb.
Ključne besede: cosmic rays, astroparticles, proton-air cross section
Objavljeno v RUNG: 04.02.2021; Ogledov: 1897; Prenosov: 0
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First upper limits on the radar cross section of cosmic-ray induced extensive air showers
R.U. Abbasi, J. P. Lundquist, 2017, izvirni znanstveni članek

Opis: TARA (Telescope Array Radar) is a cosmic ray radar detection experiment colocated with Telescope Array, the conventional surface scintillation detector (SD) and fluorescence telescope detector (FD) near Delta, Utah, U.S.A. The TARA detector combines a 40 kW, 54.1 MHz VHF transmitter and high-gain transmitting antenna which broadcasts the radar carrier over the SD array and within the FD field of view, towards a 250 MS/s DAQ receiver. TARA has been collecting data since 2013 with the primary goal of observing the radar signatures of extensive air showers (EAS). Simulations indicate that echoes are expected to be short in duration (∼ 10 µs) and exhibit rapidly changing frequency, with rates on the order 1 MHz/µs. The EAS radar cross-section (RCS) is currently unknown although it is the subject of over 70 years of speculation. A novel signal search technique is described in which the expected radar echo of a particular air shower is used as a matched filter template and compared to waveforms obtained by triggering the radar DAQ using the Telescope Array fluorescence detector. No evidence for the scattering of radio frequency radiation by EAS is obtained to date. We report the first quantitative RCS upper limits using EAS that triggered the Telescope Array Fluorescence Detector.
Ključne besede: Cosmic ray, Radar, Digital signal processing, Radar cross-section
Objavljeno v RUNG: 27.04.2020; Ogledov: 2152; Prenosov: 0
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