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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Study on the Electronic Band Structure of the Spinel Superconductor LiTi2O4 / Studie om den Elektroniska Bandstrukturen hos Spinel Supraledaren LiTi2O4

Di Berardino, Gaia January 2022 (has links)
This master’s thesis focuses on investigating the electronic properties of the superconducting spinel compound LiTi2O4 by means of computational and experimental effort. The title compound has been extensively studied in the past years, being the only known superconducting spinel oxide with relatively high Tc = 11.5 K. Even so, the origin of its superconducting mechanism is under debate, and its anomalous superconductivity is still inquired. Thanks to the recently developed ability to produce high-quality epitaxial LiTi2O4 thin films, a renewed research interest in this compound has matured. With this work, we partake in this challenge and present combined experimental and computational results on the electronic band structure of the material. Density functional theory (DFT) has been employed for the first principle electronic structure calculations performed with the Quantum ESPRESSO software. Furthermore, thin-film samples were in-situ realized with the pulsed laser deposition (PLD) method and investigated through the angle-resolved photoemission spectroscopy (ARPES) technique conducted at the ULTRA end-station of the SLS synchrotron facility at PSI in Switzerland. Here, we report the computed electronic band structure of LiTi2O4, with a detailed investigation of its density of states and Fermi surface. Further, we compare these calculations with the obtained experimental ARPES data. Emerging from this study are results supporting the non-conventional superconducting nature of LiTi2O4, which presents coexisting correlation effects, such as electron-phonon coupling and enhanced electron-electron interactions. / Denna masteruppsats fokuserar på att undersöka de elektroniska egenskaperna hos det supraledande spinellmaterialet LiTi2O4 med hjälp av datorsimuleringar samt experimentella mätningar. LiTi2O4 har studerats omfattande under de senaste åren, eftersom den är den enda kända supraledande spinelloxiden med relativt hög Tc = 11.5 K. Trots det är ursprunget till dess supraledande mekanism debatterad, och meaknismen för dess okonventionella supraledning är fortfarande inte helt förstådd. Tack vare den nyligen utvecklade förmågan att producera tunna högkvalitativa epitaxiella LiTi2O4 filmer, har ett förnyat forskningsintresse för denna förening mognat. Med detta arbete deltar vi i denna utmaning och presenterar kombinerade experimentella och beräkningsresultat om materialets elektroniska bandstruktur. Densitetsfunktionsteori (DFT) har använts för principiella elektroniska strukturberäkningar utförda med Quantum ESPRESSO-mjukvaran. Vidare realiserades tunnfilmsprover in-situ med pulsed laser deposition (PLD) medoden och undersöktes experimentellt via vinkelupplöst fotoemissionsspektroskopi (ARPES) som utfördes vid ULTRA-ändstationen på SLS synkrotronanläggningen vid PSI i Schweiz. Här rapporterar vi den beräknade elektroniska bandstrukturen för LiTi2O4, med en detaljerad undersökning av dess tillståndstäthet och Fermi-yta. Vidare jämför vi dessa teoretiska beräkningar med de erhållna experimentella ARPES data. Resultat från denna studie stöder den icke-konventionella supraledande naturen hos LiTi2O4, som också uppvisare samexisterande korrelationseffekter, såsom elektron-fononkoppling samt starka elektron-elektron-interaktioner.
12

Follow the Money : Determinants of Cap Rates in the Stockholm Office Market / Följ Pengarna : Bestämningsfaktorer för Direktavkastningskrav på Kontorsmarknaden

Saxton, Henrik January 2022 (has links)
Purpose – In recent decades the inflation- and interest rates have followed a long-termdeclining trend. Followed by central banks starting to use unconventional monetary policiesto cope with financial crises have led to increased amounts of liquidity in the financialsystems and available and looking for investment alternatives on the capital markets. At thesame time real estate property prices have set new highs corresponding to a longer-termtrend of declining cap rates. The traditional cap rate formula components the risk-free rateand risk premium less rental growth do not entirely explain the trend of declining cap ratesthat have led to very low cap rates. The purpose with this thesis quantitative study is to testif the newer cap rate determinants money supply and foreign investments percentage of allmarket transactions can explain the decline and recently very low cap rates.Design/Methodology – The master thesis firstly conducts a literature review on previousstudies on cap rate determinants and subsequent conduct an own quantitative study byrunning dynamic ordinary least squares (DOLS) regression analysis on time series ofStockholm central business district commercial office cap rates and determinants chosen asindependent variables representing macro- and market fundamental factors driving caprates with the addition of money supply proxied by monetary aggregate M3 and foreigninvestments on the market proxied by the foreign share of investments on the Stockholmcommercial office market.Findings – The DOLS regression model (1)-(5) determinants are overall significant androbust. Of the newer cap rate determinants that are tested the monetary aggregate M3 andits included lags are of higher and stronger significance and impact on the cap rate than theforeign investment share. However, the foreign investment share time-series data used inthe study do not entirely correspond to the Stockholm central business district (CBD)commercial office market but rather against the larger Stockholm commercial office marketand hence the foreign investment share is assumed to be a relevant cap rate determinantwith support from studies referred to in the section theoretical framework.Research limitations/implications – To ensure high quality in statistical analysis andhypothesis testing large data samples corresponding to longer time-series data than waspossible to obtain for this thesis quantitative study is required. However, even though arelatively small sample has been used it performed well in tests conducted of the dataquality.Originality/value – The master thesis aims to measure and quantify the impact fromunconventional monetary policy and international real estate investments on commercialoffice cap rates. Executed on the Swedish capital Stockholms CBD office market. / Syfte – De senaste decennierna har inflationen- och räntorna följt en långsiktigtnedåtgående trend. Detta har följts upp av att centralbanker börjat använda okonventionellpenningpolitik för att hantera finanskriser, vilket lett till att en ökad penningmängd i definansiella systemen sökt investeringsmöjligheter på kapitalmarknaderna. Samtidigt harfastighetspriserna satt nya rekord ett flertal gånger vilket motsvarar en långsiktig trend avsjunkande kapitaliseringstakter. Den traditionella modellen för kapitaliseringstakt med riskfriränta och riskpremium med subtraktion av hyrestillväxt förklarar inte helt detta. Syftet meddetta examensarbetes kvantitativa studie är att pröva om de nyare potentielladeterminanterna penningmängd och andelen utländska investeringar kan förklaranedgången och de nyligen väldigt låga kapitaliseringstakterna.Design/Metodik – Examensarbetet börjar med en litteraturstudie inom konceptetkapitaliseringstakt och dess determinanter. Därefter görs en kvantitativ studie med DOLSregressionsanalys av kapitaliseringstakter för kontorsmarknaden i Stockholms centralaaffärsdistrikt och modeller av dess determinanter bestående av makro- ochmarknadsfundamentala faktorer som antas vara drivande för kapitaliseringstakten. Medtillägg av determinanterna penningmängd modellerad med måttet M3 och andelenutländska investeringar modellerad med andelen utländska investeringar påkontorsmarknaden i Stockholm.Undersökningsresultat – Kapitaliseringstakts determinanterna i modellerna (1)-(5) ärövergripande signifikanta och robusta. Av de två nyare determinanterna är penningmängdM3 och dess inkluderade laggade värden av högre och starkare signifikans och med störreinverkan på kapitaliseringstakten än andelen utländska investeringar. Dessvärre motsvararinte tidsserien av andelen utländska investeringar på kontorsmarknaden i Stockholm detmindre segmentet kontorsmarknaden för Stockholms centrala affärsdistrikt och därmedantas den motsvarande andelen utländska investeringar vara signifikant med stöd av tidigarestudier som lyfts fram i litteraturstudien.Begränsningar/implikationer – För att säkerställa hög kvalité på analys av statistik behövsstora stickprov vilket motsvarar data för långa tidsserier, vilket inte var möjligt att erhålla fördetta examensarbetes kvantitativa studie. Positivt är dock ändå att tidsserie data somanvänts, trots att de inte är så långa som önskat, presterat bra i de genomförda testerna avdatakvalitén.
13

"Do not fade, do not wither, do not grow old" : En adaptionsanalys av tid och rum i Sally Potters Orlando (1992) / "Do Not Fade, Do Not Wither, Do Not Grow Old" : An Analysis of Time and Space in Sally Potter's Film Adaptation Orlando (1992)

Weber, Minon January 2021 (has links)
For almost a century, Virginia Woolf has enchanted readers all over the world with her novel about the gender fluid and time travelling character Orlando. British director Sally Potter adapted Orlando into film in 1992, and her adaptation has since gained immense fame and a continuous presence in world cinema. Potter's Orlando has been the object of a great deal of scholarly interest. However, previous research has predominantly focused on questions of gender and sexuality. Considerably underdiscussed is the film's fascinating conception of time and space. This thesis therefore sets out to analyze Sally Potter's Orlando in order to demonstrate how time and space is shaped in the film.  Theories developed by George Bluestone and André Bazin form the theoretical framework of this thesis. Through a close reading of the film, this thesis demonstrates that Potter establishes an unconventional temporality and spatiality through constructing a nonlinear, often contradictory temporality conveyed through contrasts between the organic and the fantastic, the real and the fictitious. Furthermore, the analysis finds that spatiality in Potter's Orlando is presented as multidimensional, allowing certain characters the possibility to inhabit a "fluid spatiality". Through presenting the past and the present as fused, Potter's Orlando can be understood through the optics of Bluestone's concept of "the flux of time" and Henri Bergsons la durée réelle. Simultaneously, breaks in the narrative presented through intertitles can be read as representing Bergsons idea of l'étendu, while also establishing a tangible spatiality.

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