Iskanje po repozitoriju

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Opis: Pesniška samorefleksija v poeziji predstavlja reflektiranje vprašanj, povezanih s pesniško umetnostjo, znotraj pesniškega diskurza samega. Poezija se tako odziva na poetološka vprašanja vzporedno s teoretskim diskurzom. Koncept pesniške samorefleksije je sinonimen terminu metapoezija in glede na elemente literarne komunikacije vsebinsko obsega štiri temeljna tematska polja, ki v literarnih uresničitvah doživljajo razširitve in specifikacije. To so pesnik, pesniško delo oziroma pesniška umetnost, recepcija poezije in kontekst. V pesmih je pesniška samorefleksija pomembno prisotna vse od antike dalje, še posebej pomembna prvina pa postane v sodobni poeziji 20. stoletja. V teoretskem diskurzu v 20. stoletju so bila posebne pozornosti deležna vprašanja avtorja, njegove subjektivitete in avtonomije. Prelomni razmisleki so se v veliki meri dogajali glede na romantični koncept avtonomnega božansko navdahnjenega genija. Skladno s tem dejstvom se doktorska disertacija med osrednjimi tematskimi polji pesniške samorefleksije oziroma metapoezije osredotoči na vprašanje avtorja oziroma pesnika. V disertaciji je najprej definiran koncept pesniške samorefleksije. Ob upoštevanju dosedanjih teoretskih študij prinaša premišljene zamejitve koncepta, oblik, strategij in funkcij pesniške samorefleksije. Sledi pregled oblikovanja koncepta avtorja s poudarkom na oblikovanju romantičnega pojma genija in prelomih, ki jih je bil ta deležen v 20. stoletju. Na teoretske opredelitve se nasloni interpretativna analiza sodobne slovenske poezije po drugi svetovni vojni. Opravljene so študije primerov uresničitve pesniške samorefleksije v poeziji osmih pesnic in pesnikov različnih pesniških generacij in literarnoestetskih usmeritev: Kajetana Koviča, Daneta Zajca, Tomaža Šalamuna, Nika Grafenauerja, Milana Jesiha, Taje Kramberger, Barbare Korun in Primoža Čučnika. Pesniška samorefleksija predstavlja pomemben element v sodobnem pesniškem diskurzu. Doktorska disertacija prikaže, na kakšne načine se pesniška samorefleksija uresničuje v poeziji sodobnih slovenskih pesnikov ter kakšne učinke sproža vzpostavljanje metapoetskega zavedanja. Analiza pesniške samorefleksije prispeva k teoretskim razmislekom o poeziji, hkrati pa kaže na specifično moč poezije za ubesedovanje in prikazovanje pesniških konceptov. Produktivna se izkaže za razmislek avtorske vloge: na eni strani pesnikove družbene vloge, na drugi strani pa preigravanje različnih ravni pesnika v odnosu do teksta.
Ključne besede: pesniška samorefleksija, metapoezija, avtotematska poezija, avtotematizacija, avtoreferenca, metazavedanje, pesnik, avtor, romantični koncept genija, avtonomija, deziluzija, sodobna slovenska poezija, Kajetan Kovič, Dane Zajc, Tomaž Šalamun, Niko Grafenauer, Milan Jesih, Taja Kramberger, Barbara Korun, Primož Čučnik
Objavljeno v RUNG: 31.03.2021; Ogledov: 3384; Prenosov: 174
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Opis: Advances in the development of lasers have led to a new class of radiation sources generating coherent, tunable, ultrashort light pulses in the spectral region ranging from infrared to soft X-rays. This includes high-order harmonics generation in gas (HHG), on which relies the CITIUS facility at University of Nova Gorica (Slovenia), and free-electron lasers (FELs), such as the facility FERMI at Elettra-Sincrotrone Trieste (Italy). The distinctive structure of HHG and FEL radiation paved the way to time-resolved experiments, which are performed to investigate events occurring on a short, or very short, temporal scale, from picoseconds to femtoseconds. This work focuses on the advantages and disadvantages of some experimental techniques based on using these novel light sources to investigate the microscopic and/or ultrafast dynamics of matter samples, which have been previously driven out of equilibrium. Advantages rely on the implementation of various applications based on two-color schemes and, more specifically, include the possibility of acquiring two-dimensional frequency maps, measuring electrons’ effective masses, or investigating electronic properties decoupled from the influence of the lattice. Particular focus will be put on experimental methods relying on photoelectric effect and photoelectron spectroscopy. In all experiments, we took advantage of one or more specific properties of HHG and FEL sources, such as controllable chirp, to study laser dressed states in helium, variable polarization, to study electronic properties of iron-based pnictides and ultrashort pulses (< 10 fs) to study the purely electronic dynamics in transition metal dichalcogenides. On the other hand, the study of the interface between a molecule and a topological insulator revealed some intrinsic limitations and physical drawbacks of the technique, such as spurious effects originating from the high power pulses, like multiphoton absorption and the space charge effect, or the reduction of experimental resolution when pushing for shorter and shorter pulse durations. Some disadvantages are also connected to the current state-of-the-art in the field of ultrashort laser systems, where a trade-off needs to be found between repetition rate and laser power. Finally, state-of-the-art experiments based on the ability to generate ultrashort pulses carrying orbital angular momentum in visible, near-infrared as well as extreme UV range will be presented. The use of these pulses opens the door to the investigation of new physical phenomena, such as probing magnetic vortices using extreme ultraviolet light from a free-electron laser or imprinting the spatial distribution of an ultrashort infrared pulse carrying orbital angular momentum onto a photoelectron wave packet.
Ključne besede: ultrafast lasers, two-color experiments, photoemission, high-order harmonic generation, free-electron lasers, hot-electrons dynamics, surface science, pump-probe photoemission, ultraviolet photoemission, orbital angular momentum
Objavljeno v RUNG: 02.12.2020; Ogledov: 3748; Prenosov: 112
Celotno besedilo (19,78 MB)

Opis: The number of observed tidal disruption events is increasing rapidly with the advent of new surveys. Thus, it is becoming increasingly important to improve TDE models using different stellar and orbital parameters. We study the dynamical behaviour of tidal disruption events produced by a massive black hole like Sgr A* by changing different initial orbital parameters, taking into account the observed orbits of S stars. Investigating different types of orbits and penetration factors is important since their variations lead to different timescales of the tidal disruption event debris dynamics, making mechanisms such as self-crossing and pancaking act strongly or weakly, thus affecting the circularisation and accretion disk formation. We have performed smoothed particle hydrodynamics simulations. Each simulation consists in modelling the star with $10^5$ particles, and the density profile is described by a polytrope with $\gamma$ = 5/3. The massive black hole is modelled with a generalised post-Newtonian potential, which takes into account relativistic effects of the Schwarzschild space-time. Our analyses find that mass return rate distributions of solar-like stars and S-like stars with same eccentricity have similar durations, but S-like stars have higher mass return rate, as expected due to their larger mass. Regarding debris circularisation, we identify four types of evolution, related to the mechanisms and processes involved during circularisation: in type 1 the debris does not circularise efficiently, hence a disk is not formed or is formed after relatively long time; in type 2 the debris slowly circularises and eventually forms a disk with no debris falling back; in type 3 the debris relatively quickly circularises and forms a disk while there is still debris falling back; finally, in type 4 the debris quickly and efficiently circularises, mainly through self-crossings and shocks, and forms a disk with no debris falling back. Finally, we find that the standard relation of circularisation radius $r_{\rm circ} = 2r_{\rm t}$ holds only for $\beta = 1$ and eccentricities close to parabolic.
Ključne besede: 07.05.Tp Computer modeling and simulation, 95.30.Lz Hydrodynamics, 98.35.Jk Galactic center, bar, circumnuclear matter, and bulge, 98.62.Js Galactic nuclei (including black holes), circumnuclear matter, and bulges, 98.62.Mw Infall, accretion, and accretion disks
Objavljeno v RUNG: 29.09.2020; Ogledov: 3562; Prenosov: 77
Celotno besedilo (37,55 MB)

Opis: Strong and gusty north-east wind called Bora is common in south-west regions of Slovenia, as well as along the Adriatic coast. Its intermittent behavior, related to variable strength, frequency and duration, has brought out scientific curiosity for decades. Bora affects human life and causes problems for structures built in Bora affected areas. In Slovenia, Bora is the strongest in the Vipava valley. The motivation for this research is the need to evaluate Bora wind effects on structures, commonly found in the Vipava valley region, using a high resolution computational fluid dynamics (CFD) modeling approach. To date, there are several experimental and computational constraints for accurate representation of Bora in a CFD model, therefore, the main aim of this dissertation is to build foundations for Bora wind simulations using CFD and its method of finite volumes. The dissertation incorporates the analysis of experimental measurements of Bora wind, as well as numerical modeling studies. Vertical mean wind speed profile characteristics of Bora were analyzed based on experimental measurements at Razdrto just above the Vipava valley. The obtained results contributed to the choice of Bora mean wind profiles applied at the inflow of computational models. Guidelines regarding the choice of the associated wind profile parameters were given and a new relationship between these parameters was found. As orographic barriers to the north of the Vipava valley are known to give rise to Bora and to define the specific properties of the Bora flow, numerical modeling studies were in the first place focused on the implementation of the real-scale complex terrain into a CFD model. Simulation of wind flow over orographic barrier in Vipava valley was performed using Raynolds averaged Navier-Stokes approach, providing a first estimation of the flow field over a small hill of Zemono. As resolving the turbulence characteristics of Bora is very important for the estimation of wind loads on structures, modeling studies converged towards a more appropriate approach - Large eddy simulations (LES). A crucial step in setting up an accurate LES is the generation of appropriate inflow, which was investigated for the case of atmospheric boundary layer (ABL) flow. The synthetic method PRFG^3 for the generation of unsteady inflow was tested and adapted as a source of an ABL flow with desired turbulence flow properties. Based on its performance, in particular on adequate reproduction of target turbulence intensities and length scales, it was found that PRFG^3 method may be used to generate velocity inflow with desired turbulence properties in LES. Finally, simulations of wind flow coming from Bora direction over the Vipava valley were performed with the aim to depict the effects of underlying orography on the flow within and above the valley. Modeling results were found to be comparable with the results of lidar based remote sensing of vertical atmospheric structures within and above the valley.
Ključne besede: Vipava valley, Bora wind, Wind profile, Orography, Atmospheric boundary layer, Computational fluid dynamics, Numerical simulations
Objavljeno v RUNG: 17.06.2020; Ogledov: 5246; Prenosov: 47
Celotno besedilo (35,12 MB)

Opis: Human Papillomavirus (HPV) infection is the causative agent for the invasive cervical cancer and its precancerous lesions, furthermore, there are growing evidences of HPV being a relevant factor in other anogenital cancers as well as head and neck cancers. Most sexually active women become infected with HPV at least once in their lifetime, but less than 10% of women becomes persistently infected, and it is precisely the persistent infection that contributes to the development of cervical cancer. The preventive effect of cervical cancer screening largely depends in the high women participation and coverage; indeed, a large number of cervical cancers diagnoses normally arise among under-screened and unscreened women. Increase in the screening coverage is essential to improve the effectiveness of cervical screening programmes. The main purpose of this PhD project was to solve some of the most relevant problems in the cervical cancer screening programmes, as the increase of cost-effectiveness and the amelioration of the screening coverage. My work was focused on the development and validation of the first Ulisse BioMed S.p.A. product, the HPV Selfy™ test, an innovative PCR-based kit for the direct detection and genotyping of 12 high-risk HPV types (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58 and 59) and 2 possible/probable high-risk (66 and 68), specifically optimized for the analysis of self-collected vaginal specimens. The core of this innovative test is based on high-resolution melting (HRM) analysis, a recently developed technique for fast, high-throughput post-PCR analysis of variance in nucleic acid sequences, that characterizes the amplicons by studying thermal denaturation of double-stranded DNA. Based on this approach and through the design of different HPV type-specific primer pairs and the development of a specific master mix, unique melting peaks in a single fluorescence channel were obtained, allowing the multiple detection and genotyping of 14 HPV types in a single PCR well. Three different clinical studies have been carried out to validate the assay on the vaginal self-collected samples with truly amazing results regarding the assay’s performance, but also for self-sampling acceptability by women. Moreover, data collected in these studies suggest a future possible use of this test for the hard-to-reach women, as an alternative of the conventional clinician-collected sample, in order to increase the cervical cancer screening coverage.
Ključne besede: Human Papillomavirus, HPV test, cervical cancer screening, prevention, diagnostic test, High resolution melting, HRM, genotyping, PCR, Self-sampling, clinical validation.
Objavljeno v RUNG: 17.06.2020; Ogledov: 3443; Prenosov: 106
Celotno besedilo (37,88 MB)