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51.
52.
Studying TDEs in the era of LSST
Katja Bricman, Andreja Gomboc, 2019, published scientific conference contribution abstract

Keywords: The observing strategy with continuous scanning and large sky coverage of the upcoming ground-based Large Synoptic Survey Telescope (LSST) will make it a perfect tool in search of rare transients, such as Tidal Disruption Events (TDEs). Bright optical flares resulting from tidal disruption of stars by their host supermassive black hole (SMBH) can provide us with important information about the mass of the SMBH involved in the disruption and thus enable the study of quiescent SMBHs, which represent a large majority of SMBHs found in centres of galaxies. These types of transients are extremely rare, with only about few tens of candidates discovered so far. It is expected that the LSST will provide a large sample of new TDE light curves. Here we present simulations of TDE observations using an end-to-end LSST simulation framework. Based on the analysis of simulated light curves we estimate the number of TDEs with good quality light curves the LSST is expected to discover in 10 years of observations. In addition, we investigate whether TDEs observed by the LSST could be used to probe the SMBH mass distribution in the universe. The participation at this conference is supported by the Action CA16104 Gravitational waves, black holes and fundamental physics (GWverse), supported by COST (European Cooperation in Science and Technology).
Published in RUNG: 04.01.2021; Views: 2531; Downloads: 0

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ASSESSMENT OF THE FEASIBILITY OF A MOBILE APP AIMED FOR THE PROMOTION OF A COMPANY
Hao Jiang, 2020, undergraduate thesis

Abstract: For a newly established company, one of the most important issues is to promote its own products and/or services. How to survive among many competitors is a problem, which is worthy of attention. With the popularity of mobile devices, the networks, information and digital society has been established, where global e-commerce has been improved and developed. In this society, for a new company it is highly desirable to use e-commerce promotion methods, which include making a mobile application. However, there is still an open question whether a mobile app can be used as an efficient e-commerce promotion method. In this thesis first an app has been developed for connecting the users and suppliers of musical instruments. All the users are able to share their homemade videos while playing musical instruments and exchange thoughts with all the users. At the same time, all the musical instruments related products can be merchandized between the users and merchant. Then we addressed two issues after the app has been tested: 1. For a startup, is it worth developing a product-related app? 2. In the process of using the app, what kind of attitude is the user taking on the internal product advertisement? An experiment has been set up in which 30 participants were randomly selected. Their behavior has been monitored for one month and the obtained data have been analyzed. The main result of the analysis is that 70% of the participants believe that developing an app brings certain benefit to the company. The remaining 30% of the participants think that they would love to continue to use the app after the experiment. At the same time, they have a certain interest in product advertising in the app.
Keywords: Android smartphone app, company promotion, e-commerce, sampling analysis, app development.
Published in RUNG: 28.10.2020; Views: 2717; Downloads: 88
.pdf Full text (918,26 KB)

56.
Characterisation of microbunching instability with 2D Fourier analysis
Brynes AD, Giovanni De Ninno, 2020, original scientific article

Keywords: Microbunching instability, Fourier analysis
Published in RUNG: 27.10.2020; Views: 2466; Downloads: 0
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58.
Return to materialism: between 10th and 11th Theses of Feuerbach”, in Encountering Althusser
Gal Kirn, 2013, independent scientific component part or a chapter in a monograph

Keywords: 10th thesis, 11th thesis on feuerbach, return to marx, althusser between political and theoretical analysis, new materialism
Published in RUNG: 19.08.2020; Views: 2124; Downloads: 0
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59.
Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
R.U. Abbasi, Jon Paul Lundquist, 2020, original scientific article

Abstract: The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 10^18 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 10^18, 10^18.5, 10^19, 10^19.5 and 10^20 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 10^18.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.
Keywords: methods: data analysis, cosmic rays, gamma-rays: general
Published in RUNG: 29.04.2020; Views: 2559; Downloads: 0
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60.
Testing a Reported Correlation between Arrival Directions of Ultra-high-energy Cosmic Rays and a Flux Pattern from nearby Starburst Galaxies using Telescope Array Data
R.U. Abbasi, Jon Paul Lundquist, 2018, original scientific article

Abstract: The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, we tested the same hypothesis using cosmic rays detected by the Telescope Array experiment (TA) in the 9-year period from May 2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values but kept them fixed to the best-fit values found by Auger, namely 9.7% for the anisotropic fraction of cosmic rays assumed to originate from the SBGs in the list and 12.9◦ for the angular scale of the correlations. The energy threshold we adopted is 43 EeV, corresponding to 39 EeV in Auger when taking into account the energy-scale difference between two experiments. We find that the TA data is compatible with isotropy to within 1.1σ and with the Auger result to within 1.4σ, meaning that it is not capable to discriminate between these two hypotheses.
Keywords: astroparticle physics, cosmic rays, galaxies: starburst, methods: data analysis
Published in RUNG: 27.04.2020; Views: 2807; Downloads: 121
.pdf Full text (700,72 KB)

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