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Determination of field output factors and volume averaging correction factors for different detectors in narrow Co-60 beams
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Nikola Šegedin Accurate small photon field dosimetry is critical for the effectiveness and outcome of the
treatment in radiation oncology. Small photon field dosimetry refers to the determination of
an absorbed dose in a photon beam whose size is smaller than 3 cm ∙ 3 cm. It is complex due
to the finite size of the detector, loss of lateral charged particle equilibrium, and perturbation
of secondary electron fluence by the detector. Absorbed dose distributions of a small photon
field with...
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Electric field modificiations of metal-dielectric multilayer systems for fabrication of optical filter microarray
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Petar Pervan Metal-dielectric multilayer systems are used for sensors, filters and absorbers. Fabrication of
micro/nanostructures in these systems is complex, demanding and involves many fabrication
steps. Glass poling (GP) and electric field assisted dissolution (EFAD) processes have great
potential for micro/nano structuring of metal-dielectric systems. GP and EFAD are used to
modify the compositional profile of samples by application of voltage inducing drift of
metallic species in the...
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Higher-spin-like symmetries and gauge models
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Mateo Paulišić Higher derivative generalizations of translation symmetries (i.e. higher-spin-like symmetries) are utilized in this work in a novel approach to gauging, leading to a Yang-Mills-like
theory defined over a symplectic manifold dubbed ”master space”. The developed theory
incorporates the starting symmetries by using the Moyal product, has a weakly non-local
action functional, it is perturbatively stable and admits a description in terms of an L∞
algebra. The spectrum of the theory is...
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The effects of clouds on the reconstruction of gamma-ray-induced air showers observed with CTA telescopes
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Mario Pecimotika In the very-high-energy range, both the low flux of cosmic gamma rays and their inability to
penetrate the atmosphere, limit direct observations of cosmic phenomena. Over the past three
decades, the Imaging Atmospheric Cherenkov Technique has become a powerful tool in the veryhigh-energy gamma-ray astronomy. As their name implies, Cherenkov telescopes observe gamma
rays indirectly by capturing short flashes of Cherenkov light produced in the cascade of secondary
particles in the...
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Theoretical simulations of quasi-particle spectra in doped graphene
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Josip Jakovac This thesis covers several aspects of the electronic and electromagnetic properties of doped
graphene; peculiar properties of the 2D plasmon, strong quasi-particle interactions with these
plasmons and finally the possibility of transforming these plasmons into radiative modes. The
thesis is imbued with comparisons with available experiments and offers a solution to the longstanding problem of plasmon emission prosess seen in ARPES experiments.
A graphene is a 2D single-layer hexagon...