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1.
"Also only" and the scope theory of minimizer NPIs : invited lecture at the BUSCTEL'18, February 9, 2018, Boğaziçi University, Demir Demirgil Auditorium
Elena Guerzoni, 2018, vabljeno predavanje na konferenci brez natisa

Ključne besede: Focus Particles, Presupposition, Minimizers
Objavljeno v RUNG: 21.02.2024; Ogledov: 264; Prenosov: 1
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2.
When tense shifts expressive presuppositions : hani and monstrous semantics
Furkan Dikmen, Elena Guerzoni, Ömer Demirok, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: temporal indexical shift, Turkish, discourse particles
Objavljeno v RUNG: 21.02.2024; Ogledov: 256; Prenosov: 2
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3.
Insights into the size-resolved dust emission from field measurements in the Moroccan Sahara
Cristina González-Flórez, Martina Klose, Andrés Alastuey, Sylvain Dupont, Jerónimo Escribano, Vicken Etyemezian, Adolfo Gonzalez-Romero, Yue Huang, Konrad Kandler, Jesús Yus-Díez, 2023, izvirni znanstveni članek

Opis: Atmospheric mineral dust consists of tiny mineral particles that are emitted by wind erosion from arid regions. Its particle size distribution (PSD) affects its impact on the Earth's system. Nowadays, there is an incomplete understanding of the emitted dust PSD and a lot of debate about its variability. Here, we try to address these issues based on the measurements performed during a wind erosion and dust emission field campaign in the Moroccan Sahara within the framework of FRAGMENT project.
Ključne besede: aerosol particles, mineral dust, emission processes, climate
Objavljeno v RUNG: 23.10.2023; Ogledov: 768; Prenosov: 5
.pdf Celotno besedilo (23,38 MB)
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4.
Constraints on BSM particles from the absence of upward-going air showers in the Pierre Auger Observatory
Baobiao Yue, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2023, objavljeni znanstveni prispevek na konferenci

Opis: The Fluorescence Detector (FD) of the Pierre Auger Observatory has a large exposure to search for upward-going showers. Constraints have been recently obtained by using 14 years of FD data searching for upward-going showers in the zenith angle range [110◦, 180◦]. In this work, we translate these bounds to upper limits of a possible flux of ultra high energy tau-leptons escaping from the Earth into the atmosphere. Such a mechanism could explain the observation of "anomalous pulses" made by ANITA, that indicated the existence of upward-going air showers with energies above 10[sup]17 eV. As tau neutrinos would be absorbed within the Earth at the deduced angles and energies, a flux of upward-going taus could only be resulted from an unknown type of ultra high energy Beyond Standard Model particle penetrating the Earth with little attenuation, and then creating tau-leptons through interactions within a maximum depth of about 50 km before exiting. We test classes of such models in a generic way and determine upper flux limits of ultra high energy BSM particles as a function of their unknown cross section with matter.
Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, fluorescence detector, upward-going air showers, Beyond Standard Model particles
Objavljeno v RUNG: 26.09.2023; Ogledov: 502; Prenosov: 6
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5.
ENSURING TECHNICAL CLEANLINESS OF STATOR PACKS
Rasheed Pattan, 2022, magistrsko delo

Opis: Metal stamping is a cold-forming process that uses dies and stamping presses to convert sheet metal into desired geometries. The metal stamping process leaves residues on stamped components such as releasing agents, metal shavings, and other contaminants as they exit the press. These impurities hinder the functionality of the components. Therefore, they are required to be eliminated before the stamped sheets are assembled on the production line. Contaminant metal particles on the surfaces hinder the functionality of the components and eventually promote mechanical wear between the moving parts. It is consequently difficult to eradicate contaminants, as their adhesion is inevitable, the contaminants being at a range of a few micrometres to sub-micrometres. The myriad shape configuration of the present metallic and non-metallic contaminants posed a challenge to reaching the cleanliness standards desired by the quality of the product. We aim to develop an automated decontamination process to improve product quality, with an optimized production cycle, and cost-effectiveness. Fibres non-metallic particles are also necessarily rid from the surfaces of the component. In this study, the prime focus is on metallic contaminants, excluding the non-metallic fibrous contaminants that were present. Three viable techniques are opted for based on their feasibility on production line incorporation potential. Namely, Mechanical vibration, Pressurized air-blowing, and Ultrasonic cleaning. However, to achieve the greatest possible outcome, the three different techniques are weighed against each other.
Ključne besede: Components, Ultrasonic, Vibration, Air-blow, Metallic Particles, Contamination, Technical Cleanliness, Lamination.
Objavljeno v RUNG: 26.08.2022; Ogledov: 1111; Prenosov: 45
.pdf Celotno besedilo (5,61 MB)

6.
Ultra-fast silicon detectors for CERN’S high-luminosity large hadron collider : written report
Adrián González Briones, 2022, raz. nal. na višji ali visoki šoli

Ključne besede: standard silicon detectors, ionized particles, hadrontherapy, particle physics
Objavljeno v RUNG: 15.06.2022; Ogledov: 1301; Prenosov: 0
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7.
Ice cloud formation potential by free tropospheric particles from long-range transport over the Northern Atlantic Ocean
Swarup China, Peter A. Alpert, Bo Zhang, Simeon K. Schum, Katja Džepina, Kendra Wright, R. Chris Owen, Paulo Fialho, Lynn R. Mazzoleni, Claudio Mazzoleni, 2017, izvirni znanstveni članek

Opis: Long-range transported free tropospheric particles can play a significant role on heterogeneous ice nucleation. Using optical and electron microscopy we examine the physicochemical characteristics of ice nucleating particles (INPs). Particles were collected on substrates from the free troposphere at the remote Pico Mountain Observatory in the Azores Islands, after long-range transport and aging over the Atlantic Ocean. We investigate four specific events to study the ice formation potential by the collected particles with different ages and transport patterns. We use single-particle analysis, as well as bulk analysis to characterize particle populations. Both analyses show substantial differences in particle composition between samples from the four events; in addition, single-particle microscopy analysis indicates that most particles are coated by organic material. The identified INPs contained mixtures of dust, aged sea salt and soot, and organic material acquired either at the source or during transport. The temperature and relative humidity (RH) at which ice formed, varied only by 5% between samples, despite differences in particle composition, sources, and transport patterns. We hypothesize that this small variation in the onset RH may be due to the coating material on the particles. This study underscores and motivates the need to further investigate how long-range transported and atmospherically aged free tropospheric particles impact ice cloud formation.
Ključne besede: atmospheric aerosols, ice nucleating particles, long-range transport, optical microscopy, electron microscopy, Pico Mountain Observatory
Objavljeno v RUNG: 11.04.2021; Ogledov: 2231; Prenosov: 133
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8.
Scrutinizing FR 0 radio galaxies as ultra-high-energy cosmic ray source candidates
Lukas Merten, Margot Boughelilba, Anita Reimer, Paolo Da Vela, Serguei Vorobiov, Fabrizio Tavecchio, Giacomo Bonnoli, Jon Paul Lundquist, Chiara Righi, 2021, izvirni znanstveni članek

Opis: Fanaroff-Riley (FR) 0 radio galaxies compose a new class of radio galaxies, which are usually weaker but much more numerous than the well-established class of FR 1 and FR 2 galaxies. The latter classes have been proposed as sources of the ultra-high-energy cosmic rays (UHECRs) with energies reaching up to eV. Based on this conjecture, the possibility of UHECR acceleration and survival in an FR 0 source environment is examined in this work. In doing so, an average spectral energy distribution (SED) based on data from the FR 0 catalog (FR0CAT) is compiled. The resulting photon fields are used as targets for UHECRs, which suffer from electromagnetic pair production, photo-disintegration, photo-meson production losses, and synchrotron radiation. Multiple mechanisms are discussed to assess the UHECR acceleration probability, including Fermi-I order and gradual shear accelerations, and particle escape from the source region. This work shows that in a hybrid scenario, combining Fermi and shear accelerations, FR 0 galaxies can contribute to the observed UHECR flux, as long as where shear acceleration starts to dominate over escape. Even in less optimistic scenarios, FR 0s can be expected to contribute to the cosmic-ray flux between the knee and the ankle. Our results are relatively robust with respect to the realized magnetic turbulence model and the speed of the accelerating shocks.
Ključne besede: acceleration of particles, nonthermal radiation mechanisms, jets, active galaxies, cosmic rays
Objavljeno v RUNG: 05.02.2021; Ogledov: 2497; Prenosov: 0
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