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SiPM as light detector in Cherenkov telescopes cameras at CTA
Aleš Bogovič, 2017, magistrsko delo

Opis: This master thesis describes characterization of Silicon photomultipliers (SiPM) for the upgrade of large size telescope (LST) camera at Cherenkov telescope array (CTA). Upon the construction, CTA will be the largest and most sensitive facility for detection of very-high energy (VHE, > 30 GeV) gamma-rays ever. It will use three different sizes of telescopes, where small and medium telescopes camera will be SiPM based from the beginning, but LST camera is planned to get SiPM based camera with frst upgrade. Camera upgrade is among others also being developed at University of Padovas Department of Physics and Astronomy (INFN). Due to limitations of their laboratory characterization of prototypes is done at Institute Jooef Stefan in Ljubljana, where I measured breakdown voltage of and determined photon detection effciency depending on angle of photon arrival. This information is important for determining which SiPM is best for CTA telescopes.
Ključne besede: Silicon photomultiplier, SiPM, CTA
Objavljeno: 03.05.2017; Ogledov: 100; Prenosov: 3
.pdf Polno besedilo (14,05 MB)

Digital and social ICT in the interpretation of Cultural Heritage: a new paradigm for valorisation?
Guendalina Ciancimino, 2016, magistrsko delo

Opis: Today it is widely acknowledged by international institutions, national and local administrations, and the civic society at large, that the whole of Cultural Heritage (CH), in its tangible and intangible forms, is part of our individual and collective memory, a marker of cultural identity and at the same time a demonstration of social heterogeneity and complexity. This has led to a progressive recognition of the importance of not only protecting, but also valorising CH, through its promotion and the facilitation of its fruition. Benefiting from CH depends on what and how is done to promote it and also to create a competitive advantage for the ‘cultural economy’ which is based on its reproduction. Tourism is an industry which uses CH and to some extent achieves the objective of its valorisation, widening the market for its fruition and the significance of heritage for different ‘publics’, but only to the extent that it is sustainable in its widest sense. This sets a number of challenges regarding how the heritage is offered, explained, and made accessible to visitors. In this sense, the valorisation of CH is at the core of value generation in tourism, and the use of ICTs (Information and Communication Technologies) is the channel through which increasingly cultural resources are experienced in competitive and sustainable way. New ICT tools restructure the relationship between image and word, leading to new ways to imagine and interpret CH, and offer great potential for value creation in tourism whereby perception and visual processing are essential elements of communication and experience. Interpretation, which can be informative, inspirational and entertaining, spurs understanding and appreciation, and ultimately engages visitors in CH. Besides, online social networks have a central place in the shaping of experience of the contemporary visitor and offer potential for a smart marketing approach. This Master thesis aims to demonstrate that managing the flows of information through the new technologies may indeed enhance CH valorisation, and that the introduction of digital devices and virtual technologies should follow a visitor-centred approach. It also intends to acknowledge that the application of ICTs can have a significant return in terms of economic income, stimulating and generating a stronger understanding among cultural and public institutions and organizations. The first section of this work reviews the relationship between CH and its social dimension, presenting CH as a lever to enhance social and economic development; it presents ICT and their relation with cultural tourism, illustrating the ongoing transformation of visitors into active actors in the valorisation of CH. The second section presents two case studies of digital devices applied to CH valorisation in different contexts; the impacts of the two projects in relation to heritage itself, its users and the territory are carefully analised. The research represents a starting point for more work encased in contemporary studies on the management of CH, as well as in the developing area of digital interpretation, towards a more general development of a model of sustainable CH tourism.
Ključne besede: CH management, cultural tourism, ICT, interpretation, CH experience
Objavljeno: 17.03.2017; Ogledov: 166; Prenosov: 9
.pdf Polno besedilo (2,87 MB)

Trajnostna presoja tehnologije plazemskega uplinjanja za ravnanje z odpadki na lokalnem nivoju
Simona Sučić, 2017, magistrsko delo

Opis: V magistrskem delu smo obravnavali problematiko ravnanja z odpadki v Sloveniji na lokalni ravni in trajnostne učinke uporabe sodobnih tehnologij za predelavo odpadkov. Ocenili smo smiselnost izgradnje sodobne naprave za termično obdelavo odpadkov v izbrani lokalni skupnosti − občini Kočevje ter podali pregled aktualne zakonodaje in usmeritev Slovenije in Evropske unije, ki so povezane s termično predelavo odpadkov. Osredotočili smo se na tehnologijo plazemskega uplinjanja odpadkov, ki je sodobna tehnologija s številnimi okoljskimi prednostmi, vendar z občutljivo ekonomsko učinkovitostjo zaradi še vedno trajajočega razvoja in inovativnosti. Omejena ponudba tehnologij za komercialno uporabo in relativno visoki investicijski stroški so razlog za redke primere dobrih praks, ki so primerljive z razmerami v Sloveniji. Trend se lahko spremeni, saj ravno v zadnjih letih na trg prihajajo naprave za komercialno uporabo ustrezne velikosti, ki so vse bolj zanesljive. Ugotovili smo, da bi bila uvedba plazemskega uplinjanja odpadkov v občini Kočevje s tehnološkega in ekonomskega vidika izvedljiva. Investicija za izgradnjo naprave z zmogljivostjo predelave 10.000 ton odpadkov na leto je ocenjena na 22 milijonov evrov. Izračun, ki je bil opravljen za 20-letno preučevano obdobje investicije in upošteva 50 % subvencioniranje investicije, je pokazal, da bi bila vračilna doba investicije 10 let. Upravičenost izgradnje plazemskega uplinjanja odpadkov potrjujejo tudi številne koristi z družbenega, razvojnogospodarskega in okoljskega vidika. Slovenija bi si z novo napravo lahko zagotovila večji odstotek predelave nevarnih odpadkov na domačih tleh, občina Kočevje pa bi si povišala stopnjo energetske samooskrbe in zmanjšala obremenitev okolja v primerjavi s sedanjim stanjem, kar bi občanom omogočalo kakovostnejše pogoje za življenje.
Ključne besede: ravnanje z odpadki, termična predelava, plazemsko uplinjanje, pretvorba, izraba, energija, sintezni plin, toplota, lokalna raven
Objavljeno: 15.03.2017; Ogledov: 227; Prenosov: 18
.pdf Polno besedilo (1,58 MB)

Ana Veternik, 2017, magistrsko delo

Opis: Since water is an essential substance for all life on earth, it is therefore vital to prevent its pollution and to improve wastewater purification processes. There is a vast number of pollutants which can contaminate water, of which bisphenol A (known as an endocrine disruptor) is the pollutant studied herein. In this study, several TiO2/GO based nanocomposites with various GO loadings (2, 4, 10, 20 and 40%) and differently shaped nanocrystalline TiO2 phases (titanate nanotubes (TNTs) and calcined titanate nanotubes (TNTs_500)) were synthesised. All of the nanocomposites were characterised through SEM, UV-vis-DR, TGA, BET, FT-IR and CHNS analyses and were used in the heterogeneous photocatalytic degradation of bisphenol A and compared to the activity of pure TNTs and TNT_500 photocatalysts. All TiO2/GO nanocomposites exhibit much better activity than pure TNTs and TNTs_500 catalysts. The conversion of the BPA was analysed using HPLC and the mineralisation was analysed using a TOC analysis. The best experiment was performed with TNTs_500 + 10% GO composite, which can be attributed to the TiO2 crystalline structure obtained. According to the results obtained, TiO2 + 10% GO was found to exhibit the best degradation ratio, which can be ascribed to the fact that excessive GO can act as a charge carrier recombination centre and promotes the recombination of electron-hole pairs in reduced GO.
Ključne besede: heterogeneous photocatalysis, titanium dioxide, graphene oxide, bisphenol A
Objavljeno: 23.02.2017; Ogledov: 298; Prenosov: 51
.pdf Polno besedilo (2,96 MB)

Jacopo Segato, 2016, magistrsko delo

Opis: The thesis describes the synthesis of novel yttrium(III), europium(III) and ytterbium(III) complexes with polydentate ligands containing the ferrocenyl moiety. In particular, a chelating beta-diketonate ligand having formula [FcCOCHCOCH3]- has been used for the preparation of homo- and heteroleptic complexes, these last having N-donor ligands such as 1,10-phenanthroline or tris(3,5-dimethylpyrazol-1-yl)borate in their coordination sphere. Further complexes were obtained by reacting bis(diphenylphosphino)ferrocene dioxide with proper Group 3 and lanthanide precursors, having nitromalonaldehyde or bromomalonaldehyde as supporting ligands. In all the cases, the characterizations were corroborated by electrochemical measurements and diffusion spectroscopy. Reversible or quasi-reversible one-electron oxidation of the ferrocenyl moiety was detected for the new complexes, even if the corresponding ferricinium-based compounds resulted quite strong oxidants.
Ključne besede: lanthanides, ferrocene, heteropolymetallic complexes, beta-diketonate, cyclovoltammetry
Objavljeno: 16.12.2016; Ogledov: 400; Prenosov: 20
.pdf Polno besedilo (4,17 MB)

Assessing the European fortified heritage
Mario Ronga, 2016, magistrsko delo

Objavljeno: 07.12.2016; Ogledov: 288; Prenosov: 5
.pdf Polno besedilo (26,84 MB)

Zaprtozančno vodenje več-conske peči za kaljenje jeklenic
Matej Gabrijelčič, 2016, magistrsko delo

Opis: Več-conske peči za kaljenje jeklenic se v jeklarstvu uporabljajo za izboljševanje mehanskih lastnosti jeklenic. Peč je sestavljena iz več con, v teh spreminjamo temperature z odprtostjo ventilov dovoda energenta za ogrevanje in tako sledimo predpisanim temperaturam iz diagrama procesa kaljenja. Če odprtost ventila za ogrevanje posamezne cone peči vodimo ročno, se lahko zaradi zunanjih motenj pojavi problem pri medsebojnem vplivu sprememb temperatur v conah. To povzroči slabe mehanske lastnosti jeklenic, strošek segrevanja peči se poveča, ob tem pa imamo zagotovljeno tudi slabo varnost ročno vodenega procesa. Opisane slabosti ročno vodenega procesa rešimo z avtomatsko regulacijo. Izbrali in ovrednotili smo metodo vodenja več-conske jeklarske peči za kaljenje jeklenic in pokazali ekonomsko upravičenost avtomatske regulacije. Ugotovili smo, da avtomatsko voden proces sledi zahtevam po ustrezni temperaturi v posamezni coni peči − glede na diagram kaljenja jeklenic −, je varnejši od ročno vodenega, strošek njegove vpeljave pa se povrne v kratkem časovnem obdobju. Zaključimo lahko, da je ustrezno voden proces zanesljiv in velikokrat ponovljiv, predstavlja tisti proces, ki pošilja ustrezne informacije regulatorju procesa preko povratne zanke o tem, kaj se dogaja v posamezni coni peči za kaljenje jeklenic.
Ključne besede: več-conska peč, kaljenje, jeklenica, zaprtozančno vodenje, dinamični sistem, metoda Monte Carlo
Objavljeno: 06.12.2016; Ogledov: 424; Prenosov: 20
.pdf Polno besedilo (1,31 MB)

Potencial lesne biomase za povečanje stopnje samooskrbe z gorivi v Sloveniji
Uroš Kobal, 2016, magistrsko delo

Opis: Energija je ključna dobrina našega obstoja, dela in ustvarjalnosti. Ker smo od nje tako zelo odvisni, ima pomembno vlogo njena varna, zanesljiva in konkurenčna dobava. In ker zaradi današnjih potreb ne želimo spodkopavati razvoja in okoljskih potreb zdajšnje in bodočih generacij, moramo energijo pridobivati v skladu s smernicami trajnostnega razvoja. Trenutno je velik del sveta odvisen od dobav fosilnih goriv, ki ne izpolnjujejo teh smernic. Države članice EU so si zato postavile ambiciozne cilje za povečanje rabe obnovljivih virov energije, ki bi to stanje izboljšali. Glede na to, da gozdovi pokrivajo 58,3% površine Slovenije, ima energija lesne biomase tu velik potencial. V magistrskem delu je na podlagi podatkov iz statističnih baz ocenjeno, da je vsako leto za energetsko izrabo na voljo čez 2.400.000 ton zračno suhe lesne biomase. Preko 1.600.000 ton se je že sedaj porabi v energetske namene, preostali del pa ostane neizkoriščen. Iz nje je mogoče preko enostavnejših ali bolj kompleksnih postopkov priti do trdnih, tekočih ali plinastih biogoriv, ki so uporabna v sektorju prometa in v proizvodnji električne energije ali toplote. Tehnologije, ki so poleg oksidacije trdnih lesnih goriv v nalogi predstavljene, so uplinjanje lesne biomase, soproizvodnja toplote in električne energije, proizvodnja vodika in bio zemeljskega plina, proizvodnja tekočih biogoriv s Fischer-Tropschevo sintezo, utekočinjanje lesa in depolimerizacija biomase z nadaljnjo sintezo tekočih biogoriv. Ocenjeno je, da bi lahko z implementacijo teh postopkov in uporabo domače lesne biomase na ravni države privarčevali preko 128 milijonov evrov letno, zmanjšali emisije CO2 v ozračje za skoraj 718.000 ton ter v kombinaciji z dobro delujočo lesno industrijo ustvarili 30.000 novih delovnih mest.
Ključne besede: Lesna biomasa, potencial lesne biomase, obnovljivi viri energije, biogoriva, uplinjanje biomase, utekočinjanje lesne biomase, soproizvodnja toplote in električne energije
Objavljeno: 06.12.2016; Ogledov: 403; Prenosov: 24
.pdf Polno besedilo (1,87 MB)

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