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Shaping FEL radiation
Primož Rebernik Ribič, 2016, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Najdeno v: ključnih besedah
Ključne besede: radiation, synchrotron, free-electron laser
Objavljeno: 16.01.2020; Ogledov: 1139; Prenosov: 4
Gradivo ima več datotek! Več...

Slow interatomic Coulombic decay of multiply excited neon clusters
Giovanni De Ninno, Denis Iablonskyi, 2016, izvirni znanstveni članek

Opis: Ne clusters (∼ 5000 atoms) were resonantly excited (2 p→ 3 s) by intense free electron laser (FEL) radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange between at least two neighboring excited atoms. Benefiting from the precise tunability and narrow bandwidth of seeded FEL radiation, specific sites of the Ne clusters were probed. We found that the relaxation of cluster surface atoms proceeds via a sequence of interatomic or intermolecular Coulombic decay (ICD) processes while ICD of bulk atoms is additionally affected by the surrounding excited medium via inelastic electron scattering. For both cases, cluster excitations relax to atomic states prior to ICD, showing that this kind of ICD is rather slow (picosecond range). Controlling the average number of excitations per cluster via the FEL intensity allows a coarse tuning of the ICD rate.
Najdeno v: ključnih besedah
Ključne besede: Clusters, low-denisty matter, free-electron laser
Objavljeno: 27.10.2020; Ogledov: 604; Prenosov: 0
.pdf Polno besedilo (309,21 KB)

Measuring free word order: Some empirical and modeling perspectives
Artur Stepanov, predavanje na tuji univerzi

Opis: Languages manifesting flexibility of word order (within the sentence's compositional meaning) have always presented a challenge for modern theories of syntax requiring any deviation from the canonical word order to be grammatically motivated. Parasyntactic motivations such as information structural or stylistic requirements may account for some portion of this flexibility, but not all of it. In addition, native speakers do not necessarily accept canonical and non-canonical word orders to an equal extent. In fact, the latter typically receive lower acceptability scores than the former, albeit above the subjective threshold for what would count as "ungrammatical". Some of the combinatorially possible word orders are not acceptable at all. In this experimental study we scrutinize different word order sequences in a free word order language (Serbo-Croatian) and attempt to isolate independent displacement factors responsible for various elements of the sentence appearing away from their canonical structural positions. We explore differential and cumulative effects of these independent factors to predict speakers' acceptability scores.
Najdeno v: ključnih besedah
Ključne besede: Free word order, experimental syntax, Serbo-Croatian, sentence acceptability task
Objavljeno: 11.02.2021; Ogledov: 663; Prenosov: 0
.pdf Polno besedilo (60,25 KB)

An Overview of the Characteristics of Free Market Economies
Andi Jamšek, 2021, magistrsko delo

Opis: In this work we are collecting and processing basic information that allows us a general overview of the five most popular global, free market economies which are: the exchange of currency (foreign exchange), rare metals, stocks, residential real estate and the cryptocurrency markets. By having more in-depth knowledge about the possibilities that each separate financial instrument or asset offers we are devising a strategy suited for different types of investors. Any economical system in its most natural state will create some sort of dynamic; it is possible to draw parallels between the free-economy and the Lotka-Volterra predator behaviour equations, which can help us to better visualise the behaviour of such systems. We try to compare the model with real life scenarios that had greatly affected some of the economies, one of them being the popularization of cryptocurrencies in 2017 and the other being the most recent Coronavirus epidemic. By having a rough comparison we can see a clearer picture of the practical uses and the necessities of having an increased and better selection of such models.
Najdeno v: ključnih besedah
Ključne besede: free market, investing, cryptocurrency, stocks, foreign exchange, Lotka-Volterra predator/prey equations
Objavljeno: 28.06.2021; Ogledov: 375; Prenosov: 19
.pdf Polno besedilo (1,93 MB)

Morphology and mixing state of aged soot particles at a remote marine free troposphere site
Sumit Kumar, Katja Džepina, Michael P. Dziobak, Paulo Fialho, Judith A. Perlinger, Swarup China, Barbara Scarnato, Robert C. Owen, Bo Zhang, MarianT. Ampadu, 2015, izvirni znanstveni članek

Opis: The radiative properties of soot particles depend on their morphology and mixing state, but their evolution during transport is still elusive. Here we report observations from an electron microscopy analysis of individual particles transported in the free troposphere over long distances to the remote Pico Mountain Observatory in the Azores in the North Atlantic. Approximately 70% of the soot particles were highly compact and of those 26% were thinly coated. Discrete dipole approximation simulations indicate that this compaction results in an increase in soot single scattering albedo by a factor of <= 2.17. The top of the atmosphere direct radiative forcing is typically smaller for highly compact than mass-equivalent lacy soot. The forcing estimated using Mie theory is within 12% of the forcing estimated using the discrete dipole approximation for a high surface albedo, implying that Mie calculations may provide a reasonable approximation for compact soot above remote marine clouds.
Najdeno v: ključnih besedah
Ključne besede: atmospheric aerosol, soot, long-range transport, free troposphere, single scattering albedo
Objavljeno: 11.04.2021; Ogledov: 392; Prenosov: 0
.pdf Polno besedilo (899,35 KB)

Molekularna karakterizacija lebdećih čestica slobodne troposfere sa Opservatorija Pico planine
Sumit Kumar, J. A. Perlinger, D. Helmig, J. Hueber, Swarup China, B. Zhang, R. Chris Owen, Katja Džepina, Claudio Mazzoleni, Paulo Fialho, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Long-range transported free tropospheric aerosol was sampled at the PMO (38°28’15’’N, 28°24’14’’W; 2225 m amsl) on Pico Island of the Azores in the North Atlantic. Filter-collected aerosol during summer 2012 was analysed for organic and elemental carbon, and inorganic ions. The average aerosol ambient concentration was 0.9 µg m-3. Organic aerosol contributed the majority of mass (57%), followed by sulphate (21%) and nitrate (17%). Filter-collected aerosol was positively correlated with on-line aerosol measurements of black carbon, light scattering and number concentration. Water-soluble organic compounds (WSOC) from 9/24 and 9/25 samples collected during a pollution event were analysed with ultrahigh-resolution FT-ICR MS. FLEXPART analysis showed the air masses were very aged (>12 days). ~4000 molecular formulas were assigned to each of the mass spectra between m/z 100-1000. The majority of the assigned molecular formulas have unsaturated structures with CHO and CHNO elemental compositions. WSOC have an average O/C of ~0.45, relatively low compared to O/C of other aged aerosol, which might be the result of evaporation and fragmentation during long-range transport. The increase in aerosol loading during 9/24 was linked to biomass burning emissions from North America by FLEXPART and MODIS fire counts. This was confirmed with WSOC biomass burning markers and with the morphology and mixing state of particles as determined by SEM. The presence of markers characteristic of aqueous-phase reactions of biomass burning phenolic species suggests that the aerosol collected at Pico had undergone cloud processing. The air masses on 9/25 were more aged (~15 days) and influenced by marine emissions, as indicated by organosulphates and species characteristic for marine aerosol (e.g. fatty acids). The change in air masses for the two samples was corroborated by the changes in ozone, ethane, propane, morphology of particles, as well as by FLEXPART. In this presentation we will presents the first detailed molecular characterization of free tropospheric aged aerosol intercepted at the PMO.
Najdeno v: ključnih besedah
Ključne besede: Atmospheric aerosol, Free troposphere, Mass spectrometry, Pico mountain observatory
Objavljeno: 26.05.2021; Ogledov: 331; Prenosov: 0
.pdf Polno besedilo (8,36 MB)

1/x distribution in a close proximity of the Bak-Tang-Wiesenfeld sandpile
Alexander Shapoval, druga izvedena dela

Najdeno v: ključnih besedah
Ključne besede: sandpile, scale-free distribution, power-law
Objavljeno: 09.07.2021; Ogledov: 265; Prenosov: 0
.pdf Polno besedilo (3,85 MB)

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