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3. Search for anisotropy of ultrahigh energy cosmic rays with the Telescope Array experimentJ. P. Lundquist, T. Abu-Zayyad, 2012, original scientific article Abstract: We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by the Telescope Array (TA) detector in the first 40 months of operation. Following earlier studies, we examine event sets with energy thresholds of 10 EeV, 40 EeV, and 57 EeV. We find that the distributions of the events in right ascension and declination are compatible with an isotropic distribution in all three sets. We then compare with previously reported clustering of the UHECR events at small angular scales. No significant clustering is found in the TA data. We then check the events with E > 57 EeV for correlations with nearby active galactic nuclei. No significant correlation is found. Finally, we examine all three sets for correlations with the large-scale structure (LSS) of the universe. We find that the two higher-energy sets are compatible with both an isotropic distribution and the hypothesis that UHECR sources follow the matter distribution of the universe (the LSS hypothesis), while the event set with E > 10 EeV is compatible with isotropy and is not compatible with the LSS hypothesis at 95% CL unless large deflection angles are also assumed. We show that accounting for UHECR deflections in a realistic model of the Galactic magnetic field can make this set compatible with the LSS hypothesis.
Found in: ključnih besedah
Keywords: acceleration of particles, astroparticle physics, cosmic rays, magnetic fields, methods: statistical, relativistic processes
Published: 19.05.2020; Views: 2180; Downloads: 0
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4. Aeolian dispersal of bacteria in southwest Greenland: their sources, abundance, diversity and physiological statesTina Šantl Temkiv, Ulrich Gosewinkel, Piotr Starnawski, Mark Lever, Kai Finster, 2018, original scientific article Found in: ključnih besedah
Keywords: arctic microbial communities, aeolian dispersal, community assembly, 16S ribosomal RNA, microbial activity, atmospheric processes
Published: 04.01.2021; Views: 1630; Downloads: 0
Fulltext (1,51 MB) |
5. Business-information system for smart homes based on Z-Wave technologyDavid Manchevski, 2021, undergraduate thesis Abstract: The goal of this thesis is to show how to create a system, that can be implemented in today’s market of smart home modules.
This will be done by introducing how the Z-Wave technology works, how it can be implemented in the user’s home. Furthermore, the functionalities of the Z-Wave technology will be presented together with the Z-Wave modules and their everyday uses. In addition, the business-information system can put on display how a smart home company operates, how the data is distributed between the departments of said smart home company. The business-information system is shown with the help of a data flow diagrams, entity relationship diagrams and a database of the data that is stored inside the particular database. This system will be used by a user interested in the buying the smart home technology products, partners, Z-wave certifiers, reclamation department.
Found in: ključnih besedah
Summary of found: ...Z-Waves, smart homes, business-information systems, entity-relationship, processes, data flows, data stores, modules, diploma thesis...
Keywords: Z-Waves, smart homes, business-information systems, entity-relationship, processes, data flows, data stores, modules, diploma thesis
Published: 24.01.2022; Views: 1226; Downloads: 68
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6. Characterization of electrochemical processes in metal-organic batteries by X-ray Raman spectroscopyMartin Sundermann, Hlynur Gretarsson, Robert Dominko, Urban Košir, Jan Bitenc, Alen Vižintin, Marko Petric, Matjaž Žitnik, Klemen Bučar, Iztok Arčon, Ava Rajh, Matjaž Kavčič, 2022, original scientific article Abstract: X-ray Raman spectroscopy (XRS) is an emerging
spectroscopic technique that utilizes inelastic scattering of hard Xrays
to study X-ray absorption edges of low Z elements in bulk
material. It was used to identify and quantify the amount of
carbonyl bonds in a cathode sample, in order to track the redox
reaction inside metal−organic batteries during the charge/
discharge cycle. XRS was used to record the oxygen K-edge
absorption spectra of organic polymer cathodes from different
multivalent metal−organic batteries. The amount of carbonyl bond
in each sample was determined by modeling the oxygen K-edge
XRS spectra with the linear combination of two reference compounds that mimicked the fully charged and the fully discharged
phases of the battery. To interpret experimental XRS spectra, theoretical calculations of oxygen K-edge absorption spectra based on
density functional theory were performed. Overall, a good agreement between the amount of carbonyl bond present during different
stages of battery cycle, calculated from linear combination of standards, and the amount obtained from electrochemical
characterization based on measured capacity was achieved. The electrochemical mechanism in all studied batteries was confirmed to
be a reduction of double carbonyl bond and the intermediate anion was identified with the help of theoretical calculations. X-ray
Raman spectroscopy of the oxygen K-edge was shown to be a viable characterization technique for accurate tracking of the redox
reaction inside metal−organic batteries.
Found in: ključnih besedah
Keywords: X-ray Raman spectroscopy, meta-organic batteries, oxygen K-edge XANES, electrochemical processes
Published: 24.03.2022; Views: 943; Downloads: 16
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7. Photocatalytic sol-gel/P25 TiO [sub] 2 coatings for water treatmentLev Matoh, Boštjan Žener, Marin Kovačić, Hrvoje Kušić, Iztok Arčon, Meta Levstek, Urška Lavrenčič Štangar, 2022, original scientific article Abstract: The effect of different water matrices on the photocatalytic degradation of dissolved pharmaceuticals was
explored. The focus was on the degradation efficiencies in wastewater effluent from a bioreactor and water
effluent from a central wastewater treatment plant and comparing the results with degradation in deionized H2O.
The compounds tested included: oxytetracycline, marbofloxacin, ibuprofen, diclofenac, phenytoin, ciprofloxacin,
sulfamethoxazole. For the experiments performed in this study, a compact packed-bed photocatalytic reactor was
used in which the hybrid TiO2 photocatalyst (sol-gel/P25) was deposited on ~3 mm glass beads. As expected, the
reactions proceed more slowly in wastewater than in deionized water, yet it is shown that removal of the
compounds from the water is still possible even when other organic molecules are present. Total organic carbon
measurements have shown that complete mineralization takes place albeit at slower rates than the initial
degradation of parent compounds. The results show that an acidic pH can increase the reaction rates and the
adsorption on the photocatalyst surface. Analyses of the degradation intermediates were performed using tandem
liquid chromatography triple-quadrupole mass spectrometry system. Additionally, X-ray absorption spectroscopy
was applied to get insight into the local structure of the photocatalyst before and after use. Understanding the
effects that different wastewater compositions have on photocatalytic reactions will help to refine the potential
applications of the technology.
Found in: ključnih besedah
Summary of found: ...titanium dioxide, sol-gel processes, functionla applications, water treatment...
Keywords: titanium dioxide, sol-gel processes, functionla applications, water treatment
Published: 30.09.2022; Views: 421; Downloads: 0
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8. The mass fallback rate of the debris in relativistic stellar tidal disruption eventsTaj Jankovič, 2022, published scientific conference contribution abstract Abstract: Highly energetic stellar tidal disruption events (TDEs) provide a way to study black hole characteristics and their environment. We simulate TDEs in a general relativistic and Newtonian description of a supermassive black hole's gravity. Stars, which are placed on parabolic orbits with different impact parameters, are constructed with the stellar evolution code MESA and therefore have realistic stellar density profiles. We focus our analysis on the mass fallback rate of the debris, which can trace the observed light curve of TDEs. I will present the dependence of the mass fallback rate of the debris on the impact parameter, stellar mass and age as well as the black hole's spin and the choice of the gravity's description.
Found in: ključnih besedah
Keywords: black hole physics, hydrodynamics, relativistic processes
Published: 21.10.2022; Views: 461; Downloads: 2
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