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Plumb, Jane. "Dark angels : a study of Anne Rice's Vampire chronicles." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/36264/.
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The international success of Anne Rice's Vampire Chronicles, and the release of the film Interview with the Vampire (based on her novel of the same name) has fueled an explosion of interest in the vampire genre, resulting in further incarnations of the vampire story in fiction and film. This study attempts to analyse Rice's development of the vampire narrative in relation to a body of novels and short stories which comprise a recognizable genre. The first chapter has three sections: an Introduction comprising a comparison between the Chronicles and Bram Stoker's Dracula,- a study of the Chronicles as a metaphor for homoeroticism and AIDS; and a study of the psychoanalytic aspects of vampirism linked with the concept of Rice's vampire as a Sadean hero. The second chapter has two sections: an analysis of Rice's representations of femininiiy; and a study of the myths of womanhood employed in the novels, together with the origins of these myths. The third chapter has two sections: a focus on the complex self-conscious and moral life of Rice's vampires in relation to contemporary consciousness and subjectivity; and a comparison of Rice's treatment of genre, historical romance and erotica with the vampire narratives of her contemporaries. The fourth and concluding chapter is a summary of Rice's treatment of genre, gender and religion in relation to evolving feminist, cultural and psychoanalytic debates, including reference to material from her other novels. In her self-conscious appropriation of the vampire tradition, Rice introduces a wider scope to the formulaic elements of the gothic genre, interweaving different genres with the gothic horror story. Her innovative approach to the vampire novel, with its complexity of intermingling issues, leaves many unanswered questions. It is the unresolved nature of the contradictions and paradoxes intrinsic to Rice's work that disturb and generate further debate.
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Auld, Robbie Richard. "Search for dark galaxies through the ages." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54594/.
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The work I have performed for this thesis covers a number of different areas of astronomy. My work on the LSBs is an in-depth exploration of the gas morphology and kinematics of these unusual objects. The focus is on the star forming abilities of the galaxy sample, but the HI observations also reveal a rich variety of gas morphology and motion, which are not necessarily apparent at other wavelengths. As well as being LSB, they are neutral gas-rich objects. As such they are more suited to being detected by HI surveys than by optical surveys. The Arecibo Galaxy Environment Survey (AGES) is a survey that expects to detect a large number of this type of galaxy and a large proportion of the thesis has been dedicated to my involvement with the survey. This has included designing and implementing the observing strategy, testing the data reduction pipeline, producing the final data, testing their quality and examining the efficiency of the survey detection methods. I have demonstrated some uses the AGES data can be put to from discovering hitherto undetected galaxies, through measuring the cosmic distribution of neutral hydrogen, to evaluating the cosmic significance of dark galaxies. The last point forms the central theme throughout the thesis. Of the 69 detections made by AGES in the first two datacubes, 55 do not have previous Hi measurements and 26 are previously uncatalogued. An Hi mass function (HIMF) was produced from the first galaxies detected by AGES. The best fit line to the data was a Schechter function with the parameters: a = -1.28 0.17, = 0.0076 0.0027 and M* = 7.7 1.8 x 109 M0. Using the HIMF the calculated value for the space density of neutral hydrogen was found to be pni = 7.5q3 x 107MQ Mpc-3, which is consistent with previous measurements. The overall contribution of HI to the Universal energy density was calculated from this value and found to be Qhi = 4.1 J x 10-4, confirming previous measurements of this value. Assuming the two candidates are indeed optically dark, based on this value the contribution of dark galaxies was calculated to be 4% to their respective mass bins, and less than 0.5% overall. The number density was found to be ndark 6.6 x 10-4 Mpc-3. Hence it would appear that dark galaxies are not numerous enough nor of substantial mass to be able to account for the 'missing mass' or to be able to fully represent the high number of dark matter haloes produced by CDM simulations.
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Stanway, Elizabeth Rose. "Probing the end of the Dark Ages." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616140.
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Stanimirovic, Tomislav, and Johan Winberg. "DARK AGES LUNAR INTERFEROMETER (DALI): DEPLOYMENT-ROVER - CHASSIS." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-22444.
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In this thesis we have looked at the possibility of using a rover for deployment oflunar interferometers on the far side of the Moon. This project was made togetherwith two other groups from the mechanical engineering program at HalmstadUniversity. The project was divided into three units and we had the mainresponsibility for the design of the chassis.The goal of this project is to create a better understanding of the origin of the universeand how it still to this day keeps changing. This is believed to be achievable by usinglunar interferometers that will collect data in form of cosmic microwaves from outerspace. The lunar interferometers will be placed at the far side of the Moon since thisis the only site in solar system that is shielded from human-generated interference.The work was completed in collaboration with JPL and NASA, which are worldleading designers and manufacturers of space-related products.
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Andersson, Gustav, and Emil Ericsson. "Dark Ages Interferometer (DALI) Deployment Rover: Energy System." Thesis, Högskolan i Halmstad, Energiteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25631.
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The cosmic “Dark Ages” is the cosmic era between the epochs of recombination of cosmic microwave background and the formation of the first stars. The only signal from this epoch is from neutral hydrogen, which could represent one of the richest data sets in cosmology. In order to extract this data, NASA/JPL has proposed a rover mission to the farside of the moon to deploy several radio arrays. Here the arrays would gather data undisturbed by human interference. This thesis examines the possibility of using photovoltaic and electric batteries as an energy solution for a rover on the moon. The requirement for such a system to survive on the moon is discussed in a literature study. A proof of concept simulation using a Simulink model has also been done. The thesis concludes that a rover can deploy the radio array using solar energy. It would be able to hibernate through the night using radioisotope heating. It would need to wait for its batteries to charge before each night.I kosmologi kallas epoken mellan “rekombinationen till väte” och bildandet av de första stjärnorna för “den mörka tidsåldern”. Från denna tid finns endast spår i form av strålning från neutralt väte. Denna strålning kan enligt astronomer vara en viktigare källa till data om universums uppkomst än den kosmiska mikrovågsstrålningen. Därför arbetar NASA/JPL med att hitta metoder att observera denna rika källa till data. Den mest använda metoden är att använda lågfrekventa radioteleskop för att observera strålning med våglängder mellan 3-30 m och frekvenser mellan 10-100 Mhz. Ett stort problem med så kort strålning är den lätt störs ut av mänsklig påverkan och andra radiokällor, tillexempel solen. Ett sätt att undvika antropogen störning är att bygga ett radioteleskop på månens baksida. Eftersom månen är i en låst bana runt jorden vänder den alltid samma sida bort från planeten. Därför är platsen alltid i radioskugga från jorden ochstörs inte av mänsklighetens radiotrafik. JPL har lång erfarenhet av användandet av robotfarkoster för att utforska himlakroppar. År 2030 vill de sända en så kallad rover för att upprätta en grupp radioteleskop på månen med syftet att införskaffa data om “den mörka tidsåldern.” Högskolan i Halmstad erbjuder sedan 2013 studenter möjligheten att skriva sitt examensarbete i samarbete med NASA/JPL om konstruktionen av denna rover. Detta arbete har ämnat finna en lösning på rovens energiförsörjning genom att använda solceller och batterier. Slutsatsen har varit att det är möjligt att driva en rover på månen med solceller samt batterier. Ett krav är att rovern värms med radioisotoperunder natten för att minska energianvändningen.
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Andersson, Erik, and Per-Johan Bengtsson. "Dark Ages Lunar Interferometer (DALI): Deployment-Rover - Mobility System." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-22529.
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This thesis is issued in collaboration with the Jet Propulsion Laboratory (JPL) in Pasadena, California. JPL's primary function is the construction and operation of robotic planetary spacecraft. At the time being JPL has 22 spacecraft and 10 instruments conducting active missions. The "Dark Ages" represent the last frontier in cosmology, the era between the genesis of the cosmic microwave background (CMB) and the formation of the first stars. During the Dark Ages, when the Universe was unlit by any star, the only detectable signal is likely to be that from neutral hydrogen (HI). The HI absorption occurs in dark matter-dominated overdensities, locations that will later become the birthplaces of the first stars. Tracing this evolution will provide crucial insights into the properties of dark matter and potentially reveal aspects of cosmic inflation. This could be accomplished using a radio telescope located on the far side of the Moon, the only site in the solar system shielded from human-generated interference and, at night, from solar radio emissions. Our objective has been the development of the concept of an autonomous rover that would be capable of deploying a large number of low frequency radio antennas on the lunar surface. This is an enabling task for the eventual creation of a radio telescope. The project at Halmstad University was divided into three sub-projects, where our area of responsibility has been the development of a concept of the rover's mobility system. The result of the project is the concept of a "Rocker-Bogie" suspension system, created in a 3D-environment. A concept which underwent a series of digital analyses and simulations to ensure the compliance with required specifications.Detta examensarbete är utfört i samarbete med Jet Propulsion Laboratory (JPL) i Pasadena, Kalifornien. JPL's primära funktion är konstruktion och drift av robotiserade rymdfarkoster. För tillfället har JPL 22 rymdfarkoster och 10 instrument i aktiva uppdrag. Den "mörka tiden" representerar den sista utposten i kosmologi, eran mellan uppkomsten av den kosmiska bakgrundsstrålningen (CMB) och bildandet av de första stjärnorna. Under den "mörka tiden", när universum inte var upplyst av någon stjärna, var den enda detekterbara signalen sannolikt från neutralt väte (HI). HI-absorptionen sker i mörk materia-dominerade överdensiteter, platser som senare blir födelseplatserna för de första stjärnorna. Att spåra denna utveckling kommer att ge viktiga insikter i egenskaperna hos mörk materia och eventuellt ge information om universums expansion. Detta kan åstadkommas med hjälp av ett radioteleskop på baksidan av månen. Den enda platsen i vårt solsystem avskärmad från störningar från jorden, och på natten även från solens strålning. Vår uppgift har varit att utveckla ett koncept på en autonom rover som ska placera ut ett stort antal lågfrekvensantenner på månytan. Detta är ett nödvändigt steg för det eventuella anläggandet av ett radioteleskop. Projektet vid Högskolan i Halmstad delades upp i tre delprojekt, där vårt ansvarsområde har varit att utveckla ett koncept för roverns drivsystem. Resultatet av projektet ett koncept på ett "Rocker-Bogie"-hjulupphängningssystem, skapad i en 3D-miljö. Ett koncept som har genomgått en serie av digitala analyser och simuleringar för att säkerställa överensstämmelse med krav och önskemål.
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Horton, Anthony John. "DAzLE : the Dark Ages z (Redshift) Lyman-α Explorer." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616094.
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Birgersson, Victoria, and Maximillian Lundgren-Goodman. "Dark Ages Lunar Interferometer - Deployment Rover : Propulsion and Steering Systems." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28888.
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2030 NASA Jet Propulsion Laboratory will place an interferometer, which will workas a radio telescope, on the far side of the Moon. The interferometer uses thinpolyamide films as antennas, which are rolled out by a rover (an autonomousvehicle). The thesis covers concept generation of the propulsion and steering systemof the rover.The interferometer is to be placed on the far side of the Moon in order to ensure, asfar as possible, that it is not effected by radiation from Earth. The interferometerconsists of several polyamide films, approximately 100 meters long and one meterwide. The films are to be connected in the middle in order to form a star pattern offilm. Since the rover is to roll out these films on the surface of the Moon, it will driveback and forth to the lander to pick up the rolls. The focus in the project has been todevelop a reliable and stable system as possible so that the rover can accomplish itsmission without malfunctions. The purpose with the interferometer is to map thehydrogen gas clouds which were formed during universe’s youth (Platt, 2008).The outcome of this project is a concept indicating what the most optimal design ofwheel mount, of motor mount, of wheel and steering design may be in order to steerthe rover. The method to generate concepts used is known Fredy Olsson’s method.This is a method that has been developed at Lunds University and it has been widelyused in engineering education at Halmstad University.The four concepts developed and contributes to the whole concept for propulsion andsteering system of the rover. The four concepts developed are an all six steering, allof the six wheels can be controlled individually. Each wheel is split, or divided intwo. The motor is angle mounted and the wheel is semi-open with a slope that makesthe Moon dust fall out if it comes inside.Inspiration from previous rovers which are or have been on the Moon and Mars hasbeen useful in generating concepts. Previously used concepts are stable and reliable,which are important factors in this project. Previous theses have come to theconclusion that the chassis of the rover should be the one similar to the one used onMars Science Laboratory Curiosity and Mars Exploration Rover’s Spirit andOpportunity.The Halmstad University projects in collaboration with NASA began at HalmstadUniversity in 2013, and previous projects have developed the chassis, energy systemand the deployment mechanism of the rover. This year’s project takes intoconsideration the results from previous years since a concept of a complete roverultimately is going to be presented to NASA Jet Propulsion Laboratory.The thesis is done in collaboration with NASA Jet Propulsion Laboratory inCalifornia, USA. NASA Jet Propulsion Laboratory is the leading U.S. center forrobotic exploration of the solar system.NASA Jet Propulsion Laboratory ska 2030 placera en interferometer på månensbaksida, interferometern ska fungera som ett radioteleskop. Interferometern användersig av tunna polyamidfilmer som antenner. Dessa ska rullas ut på månens yta av enrover (ett obemannat fordon). Rapporten behandlar framtagning av koncept förstyrning och framdrivning av denna rover.Interferometern ska placeras på månens baksida för att man i så stor mån som möjligtvill undkomma strålningsstörningar från Jorden. Interferometern ska bestå av flertaletpolyamidfilmer, ca 100 meter långa och en meter breda. Filmerna skasammankopplas i en kontrollenhet som finns i mitten av det stjärnformade mönsterfilmerna läggs i. Då rovern ska placera ut dessa filmer på månens yta, ska den skaköra från och till landaren för att hämta upp rullarna. Fokus i projektet har varit attgöra ett så pålitligt stabilt system som möjligt för att rovern ska klara av att slutförasitt uppdrag utan driftstörningar. Med interferometern vill man sedan kartläggavätgasmoln som bildades i universums ungdom (Platt, 2008).Resultatet av projektet är ett koncept som visar roverns framdrivnings- ochstyrsystem, hjulupphängning, motorplacering samt hur hjuldesignen kan se ut. FredyOlssons metoder har använts för att ta fram koncept som uppfyller krav och önskemåldå denna metod har använts tidigare under utbildningen.De fyra koncept som bidrar till ett koncept för hela styr- och framdrivningssystem ärstyrning och framdrivning på roverns alla sex hjul, hjulen är designade på så vis att deär delade i två. Motorn är vinkelmonterad. Roverns hjul är semi-öppna med en kantsom är högre än det djup hjulet sjunker ner i månytan., med en sluttning inuti för attsand och damm ska rinna ut.Inspiration har kommit från tidigare rovrar som varit/är aktiva på månen och Mars dådet är beprövade koncept som visat sig vara stabila och pålitliga. Tidigareexamensarbeten har kommit fram till att det chassi som ska användas är snarlikt detsom använts på Mars Science Laboratory Curiosity och Mars Exploration Rover’sSpirit och Opportunity.Projektet började på Högskolan i Halmstad 2013 och tidigare projekt har tittat påbland annat chassit, energisystem och utplaceringsenheten. Årets projekt har tagithänsyn till resultat från tidigare år, för att ett koncept på en hel rover slutligen skakunna visas upp för NASA Jet Propulsion Laboratory.Examensarbetet är genomfört i samarbete med NASA:s Jet Propulsion Laboratory iKalifornien, USA, vilka är USA:s center för robotisk utforskning av solsystemet.
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Pasalic, Haris, and Björn Bernfort. "Dark Ages Lunar Interferometer : Deployment Rover - Suspension System and Transition Mecanism." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25881.
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This thesis is a continuation of last year's work and it builds on earlier construction of a rover that will deploy an interferometer on the far side of the moon. The project is done in collaboration with (JPL) Jet Propulsion Laboratoryin Pasadena, California. Given the size of the mission, accuracy and time limit project has been split into several smaller projects. The areas that are the focus of this project are the suspension and the transition system. The transition system that is originated from the stage when the rover transforms from the transit mode to ready mode, and the suspension system, are in this thesis work presented by detailed conceptual design. The next step, not mentioned this thesis work, will be to perform aprimary structure design on the details. The project owner’s ultimate goal is to create a better understanding about the origins of the universe and its continual changing. This would give scientists an opportunity to study some of the most fundamental questions that are still are waiting for answers. Together with a group of energy engineers, Gustav Andersson and Emil Ericsson, we were caught by the very attractive project assignment, well aware that not many people get the chance or the opportunity to be involved or work with projects like this.
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Weiler, Gabriele. "Domos theiou basileos : Herrschaftsformen und Herrschaftsarchitektur in den Siedlungen der Dark Ages /." München ; Leipzig : Saur, 2001. http://catalogue.bnf.fr/ark:/12148/cb389058682.
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Chapman, Emma Olivia. "Seeing the first light : a study of the Dark and Dim Ages." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/10052092/.
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The Epoch of Reionization (EoR) represents a major phase shift in the history of our Universe. After a long, dark, period of expansion and cooling, the first ionizing sources began to ionize the surrounding hydrogen atoms. These bubbles of ionized hydrogen grew and overlapped until eventually the Universe was mostly ionized. The EoR remains a largely mysterious and unconstrained era but, since the hyperfine transition of the hydrogen atom produces a photon of wavelength 21-cm, how the distribution of this 21-cm radiation changes over redshift can be measured by current generation radio telescopes such as the Low Frequency Array (LOFAR). This thesis addresses four problems within the EoR: Firstly, a statistical detection of the EoR is not a straight-forward task due to the considerable contribution of 21-cm radiation from non-EoR sources. In this thesis I introduce two statistical methods for EoR foreground removal based on statistical independence and sparsity. Secondly, the peculiar velocity of a hydrogen atom upon emission of a 21-cm photon has an effect on the 21-cm intensity and the frequency at which we observe the photon. I adapt a semi-analytic code to output a multi-frequency observation in redshift space, a `light cone', fully incorporating the peculiar velocities of the atoms. Thirdly, recent publications suggest that there is an area of Fourier space where the EoR signal is the dominant contribution, suggesting that statistical analysis could be carried out within that region only, relieving the need for foreground subtraction methods. I consider a physically-motivated foreground model and show that the supposed EoR window is completely compromised. Finally, I apply my foreground subtraction methods to the first LOFAR-EoR data. I find that GMCA not only removes the foregrounds impressively well for such raw data but actually acts as a powerful tool for the identification of systematics within the data.
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Shukla, Hemant. "Observing the epoch of reionization and dark ages with redshifted 21-cm hydrogen line." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/54270/.
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The billion years subsequent to the Big Bang pose the next challenging frontier for precision cosmology. The concordant cosmological model, ΔCDM, propounds that during this period, the dark matter gravitationally shepherds the baryonic matter to form the primordial large-scale structures. This era is termed the Dark Ages (DA). The following era, the Epoch of Reionization (EoR), leads to the formation of the first stars and galaxies that reionize the permeating neutral hydrogen. The linear polarization of the cosmic background radiation and the Gunn-Peterson troughs in quasar absorption spectra provide indirect evidence for the EoR. Currently, there is no observational evidence for the DA. While state-of-the-art radio telescope arrays, Low Frequency Array (LOFAR) and Square Kilometre Array (SKA), propose various strategies to observe the early phases of the Universe, the advanced simulations employing high-performance computing (HPC) methodologies continue to play significant role in constraining various models based upon limited observational data. Despite a wide range of research, there is no end-to-end simulation solution available to quantifiably address the observational challenges due to statistical and systematic errors including foregrounds, ionosphere, polarization, RFI, instrument stability, and directional dependent gains. This research consolidates the cutting-edge simulation solutions, Cube-P3M, C2-Ray, and MeqTrees, to build an HPC prototype pipeline entitled, Simulating Interferometry Measurements (SIM). To establish and validate the efficacy of the SIM pipeline, the research builds a theoretical framework of two science drivers, viz., the presence of Lymanlimit absorbers and measuring non-Gaussianity from the 21-cm data. Thereafter, using the LOFAR and SKA telescope configurations, the SIM generates data visibility cubes with direction dependent and independent propagation effects. Finally, SIM extracts the original signal through standard techniques exploring the parametric phase-space. Results are presented herein.
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Francis, Fred. "Dark Ages : a study of 1980s superhero comics and the nineteenth-century American romance." Thesis, University of Kent, 2017. https://kar.kent.ac.uk/66026/.
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This study seeks to redefine, and refine, the knowledge of the period in the 1980s and 1990s when the superhero comic is often considered to have gained cultural legitimacy. The repeated story of Anglo-American comics is that 1986 was the year when comics 'grew up', and serial comics bought in comics shops and read by teenage boys became graphic novels bought by adults in bookshops. Studies in comics have a long history of attempting to challenge or revise this narrative. However, in the world of superhero comics the importance of works like Frank Miller's The Dark Knight Returns and Alan Moore's Watchmen has meant that a version of the 1986 narrative is repeated, often implicitly, throughout studies of the form. As studies in comics becomes increasingly institutionalised, and a tacit canon of Anglo-American comics is formed in the process, a better understanding of why, and how, this narrative retains its power is necessary. This thesis provides an in-depth examination of the texts of this key moment, often referred to as the 'Dark Age'.
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Ringel, Matthew Laurence. "Opera in "the Donizettian Dark Ages" management, competition and artistic policy in London, 1861-70 /." Thesis, Online version, 1996. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.338857.
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Tsutsui, Ryo. "Climbing up the Distance Ladder to the End of Dark Ages by Gamma-Ray Bursts." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/152028.
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Ding, Jiani, Zheng Cai, Xiaohui Fan, Stark Daniel P, Fuyan Bian, Linhua Jiang, McGreer Ian D, Robertson Brant E, and Brian Siana. "Constraining C iii] Emission in a Sample of Five Luminous z = 5.7 Galaxies." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623843.
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Recent observations have suggested that the C III] lambda 1907/1909 emission lines could be alternative diagnostic lines for galaxies in the reionization epoch. We use the F128N narrowband filter on the Hubble Space Telescope's (HST) Wide Field Camera 3 (WFC3) to search for C III] emission in a sample of five galaxies at z = 5.7 in the Subaru Deep Field and the Subaru/XMM-Newton Deep Field. Using the F128N narrowband imaging, together with the broadband imaging, we do not detect C III] emission for the five galaxies with JAB ranging from 24.10 to 27.00 in our sample. For the brightest galaxy J132416.13+274411.6 in our sample (z = 5.70, J(AB) = 24.10), which has a significantly higher signal to noise, we report a C III] flux of 3.34 +/- 1.81 x 10(-18) erg s(-1)cm(-2), which places a stringent 3 sigma upper limit of 5.43 x 10(-18) erg s(-1)cm(-2) on C III] flux and 6.57 angstrom on the C III] equivalent width. Using the stacked image, we put a 3 sigma upper limit on the mean C III] flux of 2.55 x 10(-18) erg s(-1) cm(-2) and a 3 sigma upper limit on the mean C III] equivalent width of 4.20 angstrom for this sample of galaxies at z = 5.70. Combined with strong C III] detection reported among high-z galaxies in the literature, our observations suggest that the equivalent widths of C III] from galaxies at z > 5.70 exhibit a wide range of distribution. Our strong limits on C III] emission could be used as a guide for future observations in the reionization epoch.
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Tang, Ji-Jia, Tomotsugu Goto, Youichi Ohyama, Wen-Ping Chen, Fabian Walter, Bram Venemans, Kenneth C. Chambers, et al. "A Quasar Discovered at redshift 6.6 from Pan-STARRS1." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/624514.
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Luminous high-redshift quasars can be used to probe of the intergalactic medium in the early universe because their UV light is absorbed by the neutral hydrogen along the line of sight. They help us to measure the neutral hydrogen fraction of the high-z universe, shedding light on the end of reionization epoch. In this paper, we present a discovery of a new quasar (PSO J006.1240+39.2219) at redshift z = 6.61 +/- 0.02 from Panoramic Survey Telescope & Rapid Response System 1.Including this quasar, there are nine quasars above z > 6.5 up to date. The estimated continuum brightness is M-1450 = -25.96 +/- 0.08. PSO J006.1240+39.2219 has a strong Ly alpha emission compared with typical low-redshift quasars, but the measured near-zone region size is R-NZ = 3.2 +/- 1.1 proper megaparsecs, which is consistent with other quasars at z similar to 6.
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Forster, Emily Elizabeth. "Palaeoecology of human impact in northwest England during the early medieval period : investigating 'cultural decline' in the Dark Ages." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/185801/.
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The period following the Roman withdrawal from England in AD 410 has long been considered a time of ‘cultural decline’, owing to the relative paucity of archaeological evidence relating to this time and the dismal state of affairs described by the Dark Age historians Gildas (c AD 540) and Bede (AD 731). Traditionally this period has been viewed as a time of chaos in which farmland was abandoned and the population declined, leading to woodland regeneration in many areas. In Northwest England, archaeological remains for the early medieval period (c AD 410-1066) are sparse. Early palynological studies in Cumbria, for which radiocarbon dates were often lacking or imprecise, frequently assigned major ‘woodland clearances’ to the Romano-British period, woodland regeneration phases to the early Dark Ages, ‘subdued’ agriculture to Anglo-Saxon farmers and pastoral clearances to the actions of Norse settlers. The overarching aim of this study has been to question the validity of the above interpretations through analysis of pollen and diatom records from six tarns within the English Lake District. Of the sites investigated, both Loughrigg and Barfield Tarns produced good records for the study period. The pollen curves for Loughrigg Tarn appear to support the traditional interpretation of woodland regeneration in the early post-Romano-British period, while at Barfield Tarn the pollen indicates a largely open landscape with limited evidence for agriculture. Drawing together the data from these sites with the small body of extant palaeoecological research relating to this period, it is clear that the timing and nature of land-use varied across the region. This highlights the importance of localised pollen studies, particularly as regards the relationship between vegetation records and archaeological remains. Pollen-vegetation simulation experiments using HUMPOL (Bunting & Middleton, 2005) were a useful aid to interpretation, raising important questions regarding ‘woodland regeneration’ signals in pollen diagrams
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De, Simone Girolamo Ferdinando. "The dark side of Vesuvius : landscape change and the Roman economy." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:b2666eb6-6c03-4d59-a92e-dcfc2820c6ff.
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This study investigates the territories of Neapolis and Nola in order to understand what role they played in the economy of their cities and in Campania. It further explores the difficult relationship between mankind and the fragile landscape of Vesuvius, how eruptions changed settlement patterns, exploitation strategies, and how people dealt with other smaller natural disasters that frequently occurred in that area. The thesis is organised in nine chapters, each describing a separate layer of the landscape. The introduction analyses the reasons for the apparent lack of data for the northern slopes of the volcano and further discusses the theoretical issues pertaining to the economy of the countryside. The history chapter lists the major facts of the histoire événementielle and their connection with the landscape’s longterm history. The third chapter studies the features of the static landscape and the exploitation of bedrock resources. Vesuvius is the subject of the fourth chapter, in which are discussed its shape and the eruptions' effects on the static landscape. Chapter five discusses the river Sebethus and how the intermingled action humans and nature created the marshes. Agriculture and animal breeding are analysed in chapter six, settlement patterns in chapter seven, trade in chapter eight. Through archival research and field survey it has been possible to plot 820 sites from ancient southern Campania, 263 of which from the territories of Neapolis and Nola. This evidence has been matched with environmental and archaeological datasets to provide estimates on agricultural produce and population, thus defining surplus and dependance for certain products. The results reveal a high compartmentalisation and degree of dependence of each micro-regional area on the others, for which one can deduce a high specialisation of each economic agent but not necessarily a high productivity for each of its units.
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Dimming, Jessica. "”Would you understand what I meant if I said I was only human?” : The Image of the Vampire in Stephenie Meyer’s Twilight and Charlaine Harris’s Dead Until Dark." Thesis, Karlstads universitet, Estetisk-filosofiska fakulteten, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-26007.
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Abstract In this essay I have decided to look at two very popular vampire novels today, Dead Until Dark by Charlaine Harris and Twilight by Stephenie Meyer. The focus of this essay is to look at the similarities and differences between these two novels and compare them to each other but also to the original legend of the vampire; this by using Dracula and other famous vampire stories to get an image of the vampire of pop-culture. I look at the features of the vampires, their abilities and different skills, and also sex and sexuality and how it is represented in these different stories. Even though the novels attract a wide audience they are written for a younger one and have a love story as its center. In this essay I give my opinion and view of the vampires and what I believe to be interesting with the morals and looks of the vampires as one of the different aspects.
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Leethochawalit, Nicha, Tucker A. Jones, Richard S. Ellis, Daniel P. Stark, and Adi Zitrin. "ABSORPTION-LINE SPECTROSCOPY OF GRAVITATIONALLY LENSED GALAXIES: FURTHER CONSTRAINTS ON THE ESCAPE FRACTION OF IONIZING PHOTONS AT HIGH REDSHIFT." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622164.
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The fraction of ionizing photons escaping from high-redshift star-forming galaxies is a key obstacle in evaluating whether galaxies were the primary agents of cosmic reionization. We previously proposed using the covering fraction of low-ionization gas, measured via deep absorption-line spectroscopy, as a proxy. We now present a significant update, sampling seven gravitationally lensed sources at 4 < z < 5. We show that the absorbing gas in our sources is spatially inhomogeneous, with a median covering fraction of 66%. Correcting for reddening according to a dust-in-cloud model, this implies an estimated absolute escape fraction of similar or equal to 19% +/- 6%. With possible biases and uncertainties, collectively we find that the average escape fraction could be reduced to no less than 11%, excluding the effect of spatial variations. For one of our lensed sources, we have sufficient signal-tonoise ratio to demonstrate the presence of such spatial variations and scatter in its dependence on the Ly alpha equivalent width, consistent with recent simulations. If this source is typical, our lower limit to the escape fraction could be reduced by a further factor similar or equal to 2. Across our sample, we find a modest anticorrelation between the inferred escape fraction and the local star formation rate, consistent with a time delay between a burst and leaking Lyman continuum photons. Our analysis demonstrates considerable variations in the escape fraction, consistent with being governed by the small-scale behavior of star-forming regions, whose activities fluctuate over short timescales. This supports the suggestion that the escape fraction may increase toward the reionization era when star formation becomes more energetic and burst-like.
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Bian, Fuyan, Xiaohui Fan, Ian McGreer, Zheng Cai, and Linhua Jiang. "High Lyman Continuum Escape Fraction in a Lensed Young Compact Dwarf Galaxy at z=2.5." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624376.
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We present the HST WFC3/F275W UV imaging observations of A2218-Flanking, a lensed compact dwarf galaxy at redshift z approximate to 2.5. The stellar mass of A2218-Flanking is log(M-*/M-circle dot) = 9.14(-0.04)(+0.07) and SFR is 12.5(-7.4)(+3.8) M-circle dot yr(-1) after correcting the magnification. This galaxy has a young galaxy age of 127. Myr and a compact galaxy size of r(1/2) = 2.4 kpc. The HST UV imaging observations cover the rest-frame Lyman continuum (LyC) emission (similar to 800 angstrom) from A2218-Flanking. We firmly detect (14s) the LyC emission in A2218-Flanking in the F275W image. Together with the HST F606W images, we find that the absolute escape fraction of LyC is f(abs,esc) > 28%-57% based on the flux density ratio between 1700 and 800 angstrom (f(1700)/f(800)). The morphology of the LyC emission in the F275W images is extended and follows the morphology of the UV continuum morphology in the F606W images, suggesting that the f(800) is not from foreground contaminants. We find that the region with a high star formation rate surface density has a lower f(1700)/f(800) (higher f(800)/f(1700)) ratio than the diffused regions, suggesting that LyC photons are more likely to escape from the region with the intensive star-forming process. We compare the properties of galaxies with and without LyC detections and find that LyC photons are easier to escape in low-mass galaxies.
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Imara, Nia, Abraham Loeb, Benjamin D. Johnson, Charlie Conroy, and Peter Behroozi. "A Model Connecting Galaxy Masses, Star Formation Rates, and Dust Temperatures across Cosmic Time." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/627101.
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We investigate the evolution of dust content in galaxies from redshifts z = 0 to z = 9.5. Using empirically motivated prescriptions, we model galactic-scale properties-including halo mass, stellar mass, star formation rate, gas mass, and metallicity-to make predictions for the galactic evolution of dust mass and dust temperature in main-sequence galaxies. Our simple analytic model, which predicts that galaxies in the early universe had greater quantities of dust than their low-redshift counterparts, does a good job of reproducing observed trends between galaxy dust and stellar mass out to z approximate to 6. We find that for fixed galaxy stellar mass, the dust temperature increases from z = 0 to z = 6. Our model forecasts a population of low-mass, high-redshift galaxies with interstellar dust as hot as, or hotter than, their more massive counterparts; but this prediction needs to be constrained by observations. Finally, we make predictions for observing 1.1 mm flux density arising from interstellar dust emission with the Atacama Large Millimeter Array.
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Golightly, Paul. "The Light of Dark-Age Athens: Factors in the Survival of Athens after the Fall of Mycenaean Civilization." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc799552/.
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When looking at Dark Age Greece, one of the most important sites to consider is Athens. The Dark Age was a transitional period between the fall of Mycenaean Greece of the Bronze Age, and Archaic Greece of the Iron Age. This period is called the Dark Age because the palaces that ruled the Mycenaean age collapsed, and with them fell civilization in mainland Greece. Writing, fine art, massive architecture, trade, and luxury goods disappear from mainland Greece. But Athens survived the fall of the Mycenaeans. In order to understand the reason why Athens survived one must look at what the causes of the fall of the Mycenaeans were. Theories range from raiders and invasion, to natural disasters, such as earthquakes, droughts, and plagues. One must also examine Greece itself. The landscape and climate of Greece have a large impact on the settlement of the Greeks. The land of Greece also affects what Greek communities were able to do economically, whether a city would be rich or poor. It is because Athens is located in Attica that it survived. Attica had the poorest soil in the Mycenaean world, and was the poorest of the major cities, therefore, when looking at the collapse of the Mycenaeans being caused by people, there would be no reason for said people to raid or invade Athens and Attica. It is because Athens survives that it is such an important site. Athens survived the fall of the Mycenaeans and in doing so acts as a refugee center and a jumping off point for the remaining Mycenaeans to flee east, to the Aegean islands and Anatolia. Athens also stayed occupied during the Dark Age and because of this it was able to make some advancements. In particular Athens was a leader in mainland Greece in the development of iron. Not only this, but Athens became a cultural center during the Dark Age, inventing both proto-geometric and geometric pottery. These styles were adopted by the rest of the Greek world, and Athens was looked to as the influence for these styles. It is because Athens was the poorest city and Attica the poorest area during the Mycenaean age that it survived. Because it survived it was able to continue to develop and in turn influence the rest of mainland Greece.
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Rydberg, Claes-Erik. "Gravitational lensing as a probe of the first stars and galaxies." Doctoral thesis, Stockholms universitet, Institutionen för astronomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-110070.
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This thesis investigates the potential for detection and identification of primordial stars, galaxies, and supernovae at high redshift. Simulations indicate that the first Population III stars should appear in minihalos of mass M = 105-106 Msol at z ≈ 10-30. To assess the detectability of these objects, theoretical models of these stars and their surrounding HII regions are used. We assess the plausibility of detection with the upcoming James Webb Space Telescope (JWST), using the gravitational lensing provided by the galaxy cluster MACSJ0717.5+3745. The conclusion is that the detection of these objects is highly improbable but not impossible. To investigate the prospects of detecting and identifying the first galaxies, the spectral synthesis code Yggdrasil is introduced. According to this code, JWST may be able to detect Population III galaxies with stellar masses as low as 105 Msol at z ≈ 10 in unlensed fields. We find that, over limited redshift intervals, it could be possible to use Hubble Space Telescope (HST) and/or JWST broadband color criteria to single out Population III galaxy candidates. The prospects of detecting gravitationally lensed Population III galaxies with JWST and HST is investigated. A lower limit to detect ≈1 Population III galaxy of ε ≈ 10-2 (HST/CLASH) and ε ≈ 10-3 (JWST using MACS J0717.5+3745 as lens) is derived, where ε is the baryon fraction converted to Population III stars in a host halo. By fitting HST/CLASH data to Yggdrasil and comparison grids, two Population III galaxy candidates are discovered. These two candidates are the first Population III galaxy candidates discovered at z > 6.5. A highly-magnified and doubly lensed extremely high-redshift (z ≈ 7.8) object is also identified. Finally the prospects of detecting core-collapse (CC) supernovae (SN) from the first galaxies at z ≈ 5-12 are investigated. The prediction is that no primordial SN is detectable, but 2-3 CC SN should be discovered by the HST/CLASH.At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted. Paper 6: Submitted. Paper 7: Manuscript.
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Pawlik, Andreas H., Alireza Rahmati, Joop Schaye, Myoungwon Jeon, and Vecchia Claudio Dalla. "The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/623851.
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We introduce a new suite of radiation- hydrodynamical simulations of galaxy formation and reionization called Aurora. The Aurora simulations make use of a spatially adaptive radiative transfer technique that lets us accurately capture the small- scale structure in the gas at the resolution of the hydrodynamics, in cosmological volumes. In addition to ionizing radiation, Aurora includes galactic winds driven by star formation and the enrichment of the universe with metals synthesized in the stars. Our reference simulation uses 2 x 512(3) dark matter and gas particles in a box of size 25 h(-1) comoving Mpc with a force softening scale of at most 0.28 h(-1) kpc. It is accompanied by simulations in larger and smaller boxes and at higher and lower resolution, employing up to 2 x 1024(3) particles, to investigate numerical convergence. All simulations are calibrated to yield simulated star formation rate functions in close agreement with observational constraints at redshift z = 7 and to achieve reionization at z approximate to 8.3, which is consistent with the observed optical depth to reionization. We focus on the design and calibration of the simulations and present some first results. The median stellar metallicities of low- mass galaxies at z = 6 are consistent with the metallicities of dwarf galaxies in the Local Group, which are believed to have formed most of their stars at high redshifts. After reionization, the mean photoionization rate decreases systematically with increasing resolution. This coincides with a systematic increase in the abundance of neutral hydrogen absorbers in the intergalactic medium.
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Deparis, Nicolas. "Etude numérique de l'époque de réionisation avec le code de simulation EMMA." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE047/document.
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L’époque de réionisation (EoR) est une phase de grands changements qu’a subit l’Univers dans son premier milliard d’années. Suite à l’apparition des premières étoiles et à l’émission de photons énergétique par ces dernières, l’hydrogène a été réionisé. Cette transition a eu un impact sur la formation des galaxies. J’ai activement participé au développement d’EMMA, un code de simulation numérique ayant pour objectif d’étudier les processus à l’œuvre durant l’EoR. J’ai développé et implémenté un modèle de formation et d’évolution stellaire. Ces travaux ont contribué à la réalisation d’une simulation dédiée à l’étude de l’EoR parmi les plus grosses réalisées à l’heure actuelle. J’ai contribué au développement d’outils dédiés à l’exploration de simulations de ce type. J’ai étudié la façon dont le rayonnement s’échappe des galaxies en fonction des paramètres du modèle stellaire, et montré que les supernovæ peuvent augmenter la fraction de photons libérés. J’ai également étudié la propagation des fronts d’ionisation et montré qu’il était possible de réduire la vitesse de la lumière par trois (et ainsi diminuer le temps de calcul du transfert du rayonnement par 3), tout en conservant des résultats corrects ?The epoch of reionization (EoR) is a phase of big changes in the first billion years of the Universe history. After the apparition of the first stars and the emission of energetic radiation by thoses ones, the hydrogen was reionized. This transition has an impact on the galaxies formations. I was part of the development team of EMMA, a numerical simulation code who aimed to study the processes happening during the EoR. I developed and implement a stellar formation and evolution model. These works contributed to the realisation of one of the biggest simulation dedicated to the study of the EoR yet. I contribute to the development of a tool dedicated to the exploration of this kind of simulations. I study how the radiation escaped the galaxies as a function of the parameters of the stellar model, and showed that supernovae could increase the ratio of escaping photon. I also studied the ionization fronts propagation and showed that the speed of light could be reduced by a factor 3 (and then divide the computational cost of the radiative transfer by 3), while keeping corrects results
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Gorce, Adélie. "Cosmological signatures of the Epoch of Reionisation." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP026.
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La réionisation cosmique, pendant laquelle les premières étoiles ionisent les atomes du milieu intergalactique, est encore méconnue. Dans ce travail, je développe des outils permettant d’améliorer l’analyse et l’interprétation des données pour mieux comprendre cette époque. M’intéressant au processus global dans un premier temps, je donne un scénario de référence pour la réionisation, fondé sur quelques hypothèses simples à propos de l’Univers jeune, mené par les galaxies, et qui pour la première fois est en accord avec toutes les données disponibles. Cependant, la réionisation intervient également à de plus petites échelles, et s’intéresser à la façon dont les galaxies ionisent leur environnement immédiat peut nous renseigner sur leurs propriétés physiques. C’est pourquoi dans un second chapitre, j’introduis des outils statistiques innovants qui pourront être appliqués à des cartes d’intensité du signal à 21cm et aux observations à petites échelles du fond diffus cosmologique. Ces méthodes sont conçues spécialement pour l’étude de la réionisation, et plus particulièrement pour être robustes aux contraintes liées à l’observation du signal 21cm. Elles sont disponibles publiquement. Enfin, je présente les limites de mes différents outils, liées à la fois aux méthodes d’observation elles-mêmes, ainsi qu’à des erreurs de modélisation. Avec ce travail, j’ouvre la voie à une analyse cosmologique cohérente des données qui permettra d’obtenir, une fois que la nouvelle génération de télescopes aura donné ses premiers résultats, une compréhension à la fois globale et locale de la réionisation, c’est-à-dire nous renseignant sur l’Univers dans son intégralité, mais également sur la nature de ses premières sources de lumièreThe Epoch of Reionisation, when the first galaxies slowly ionise the atoms of their surrounding intergalactic medium is still poorly known. During my PhD, I have developed new ways to constrain reionisation, in order to improve the analysis and interpretation of current and future observations. Choosing an outside-in approach, I first give a simple, comprehensive history of reionisation, finally able to fit all the available data, where few galaxies perform the full IGM reionisation and based on reasonable assumptions on the nature of the highredshift Universe. However, reionisation is not only a large-scale process, and we can learn about the properties of the first stars and galaxies when looking at how they ionise their immediate surroundings, on scales of a few hundreds of megaparsecs. In this perspective, in a second chapter, I introduce new statistical tools to be applied to small-scale data, from intensity mapping of the 21cm signal of neutral hydrogen to high-multipole CMB observations. These methods are designed to study reionisation, and in particular to be robust to instrumental effects, a central issue of 21cm observations. In the last chapter, I discuss the observations- and modelrelated limitations of current results, by looking at the way poorly known parameters impact our current scenarios of reionisation and by proposing unbiased and efficient observational strategies. In these three years of work, I have developed new tools, designed for the study of the EoR, namely to overcome specific model- and observations-related limitations, and made them available for the community. Doing so, I have paved the way for a clean cosmological analysis of reionisation data. Once next-generation data is available, these methods will give reliable constraints on the global and local history of cosmic reionisation, telling us about the Universe as a whole and about the nature of its early light sources
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Paule, Anna. "La parure chypriote de la fin de l'âge du bronze à l'époque archaïque, étudiée dans le contexte de la Méditerranée orientale." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM3017.
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L'apparition de parures de style oriental (ou « phénicien ») sur des sites chypriotes et égéens entre le XIIe et le VIIe s. av. J.-C. est un phénomène bien attesté. Sélectionnées sur le critère d'une ressemblance visible, on peut dresser une liste de parures, réalisées en or ou d'autres matières telles que le bronze, trouvées sur le continent grec (Tirynthe, Perati) et sur îles égéennes (Crète, Naxos, Kos et Rhodes).Cependant, la nature de ces échanges, qui ne suivent pas un schéma régulier, reste difficile à cerner. D'une part, il existe des parallèles visiblement étroits entre les parures chypriotes et d'autres découvertes en dehors de cette île. Elles semblent être issues de contacts directs entre les régions. L'étude sur leurs modèles de diffusion et d'autres, qui concernent les produits en métal plus que la céramique, permettent d'aller au-delà d'une étude comparative des parures. Ainsi, il s'est avéré que les contextes contenant non seulement des parures mais aussi d'autres objets d'aspect étranger sont relativement fréquents. Outre ce matériel, nous sommes confrontés à d'autres parures qui ne sont comparables que sous réserve. Leur apparence suggère la présence de contacts indirects, donc une circulation d'idées plutôt que d'objets. En ce qui concerne des futures études, les résultats des fouilles récentes menées sur le site postpalatial de Tirynthe se sont avérés particulièrement intéressants. De plus, il faut signaler que la question de l'origine de la fibule pose un problème qui n'a pas encore été résoluThe appearance of jewellery of Near-Eastern origin at Cyprus and Greece is a well-known phenomenon which we meet also from the 12th to the 7th century BC. Well-known examples made from gold and from bronze were found at the Greek continent (Tiryns, Perati) and at the Aegean islands (Crete, Naxos, Kos, Rhodes).The nature of these overseas exchanges, however, can hardly be determined and does not follow any regular system. At the one hand, there are striking parallels between certain Cypriot pieces of jewellery and other specimens found outside of Cyprus. They seem to be the result of direct contacts. The studies of the contexts to which these objects belong allow us to go beyond the mere documentation of jewellery. Following this approach, it is evident that various tombs contained not only pieces of jewellery, but also other foreign objects. This seems to support our hypotheses about on-going overseas contacts. At the other hand, there are a number of items which appear to be local products inspired from Cypriot art. Obviously, they are the result of indirect contacts or of a spreading of ideas.Regarding future studies about Cypriot or Cypriot-inspired objects, the more recent discoveries made in Tiryns are particularly noteworthy. Furthermore, one has to consider that the problems related to the origin of the fibula, which occurs at the end of the Late Bronze Age, have still not been resolved
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Furlong, Pierce James. "Aspects of ancient Near Eastern chronology (c. 1600-700 BC)." Melbourne, 2007. http://repository.unimelb.edu.au/10187/2096.
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The chronology of the Late Bronze and Early Iron Age Near East is currently a topic of intense scholarly debate. The conventional/orthodox chronology for this period has been assembled over the past one-two centuries using information from King-lists, royal annals and administrative documents, primarily those from the Great Kingdoms of Egypt, Assyria and Babylonia. This major enterprise has resulted in what can best be described as an extremely complex but little understood jigsaw puzzle composed of a multiplicity of loosely connected data. I argue in my thesis that this conventional chronology is fundamentally wrong, and that Egyptian New Kingdom (Memphite) dates should be lowered by 200 years to match historical actuality. This chronological adjustment is achieved in two stages: first, the removal of precisely 85 years of absolute Assyrian chronology from between the reigns of Shalmaneser II and Ashur-dan II; and second, the downward displacement of Egyptian Memphite dates relative to LBA Assyrian chronology by a further 115 years. Moreover, I rely upon Kuhnian epistemology to structure this alternate chronology so as to make it methodologically superior to the conventional chronology in terms of historical accuracy, precision, consistency and testability.
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Wang, Nai-Hsuan, and 王乃萱. "Blooming red rose in dark night:Research of Taiwan Vampire BL fiction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/s34b9d.
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碩士國立臺灣師範大學
台灣語文學系
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At 1990 in Taiwan. Lots of BL novels, which homoerotic style contains gothic, vampire. The vampire come from western. In Taiwan, many love story writer add this style in their product, which mixed male homosexual and gothic terror novel. That become another new style. Homosexual lust always behind in various metaphor. The serial of Visit Vampire in the night witten by CIAN,WU, that not only tells process of vampire love, but also a memoirs of self-repression and homosexual desire. This paper will probe the image and metaphor of vampire in BL novel. For example, why BL novel need vampire imagery. When vampire struggled, is it imply homosexual is uncertainty in the society? Connect homosexual and vampire closely, it metaphor for era fast flow. Vampire imagery become more meaningful in BL novel. This paper attempt to analyze the serial of Visit Vampire in the night witten by CIAN,WU through Vampire look for life in the night written by Jean Marigny, to fegure out imagery of vampire in BL novel.
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Ahn, Kyungjin Shapiro Paul R. "The nature and consequences of cosmological halo formation dark matter and the dark ages /." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/2233/ahnk06713.pdf.
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Ahn, Kyungjin. "The nature and consequences of cosmological halo formation: dark matter and the dark ages." Thesis, 2005. http://hdl.handle.net/2152/2233.
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Alvarez, Marcelo Alonso. "Structure formation and the end of the cosmic dark ages." Thesis, 2006. http://hdl.handle.net/2152/2808.
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竹内, 良貴, and Yoshitaka Takeuchi. "Theoretical studies for proving the Universe with cosmological 21cm surveys: "from dark ages up to the present time"." Thesis, 2014. http://hdl.handle.net/2237/19997.
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Hummel, Jacob Alexander. "The hunt for teh first supernovae : the source density and observability of pair instability supernovae from the first stars." 2012. http://hdl.handle.net/2152/16725.
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Theoretical models predict that some of the first stars ended their lives as extremely energetic pair-instability supernovae (PISNe). With energies approaching 10⁵³ ergs, these supernovae are expected to be within the detection limits of the upcoming James Webb Space Telescope (JWST), allowing observational constraints to be placed on the properties of the first stars. We estimate the source density of PISNe using a semi-analytic halo mass function based approach, accounting for the effects of feedback from star formation on the PISN rate using cosmological simulations. We estimate an upper limit of ~0.2 PISNe per JWST field of view at any given time. Feedback can reduce this rate significantly, e.g., lowering it to as little as one PISN per 4000 JWST fields of view for the most pessimistic explosion models. We also find that the main obstacle to observing PISNe from the first stars is their scarcity, not their faintness; exposures longer than a few times 10⁴ s will do little to increase the number of PISNe found. Given this we suggest a mosaic style search strategy for detecting PISNe from the first stars. Even rather high redshift PISNe are unlikely to be missed by moderate exposures, and a large number of pointings will be required to ensure a detection.text
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Αντύπας, Κωνσταντίνος. "Υγρά κέλευθα : πλοία και ρότες στην Ομηρική εποχή." Thesis, 2014. http://hdl.handle.net/10889/8558.
Full textAbstract:
Η παρούσα εργασία έχει ως θέμα τις συνθήκες ναυσιπλοΐας και την έκφραση του ναυτικού βιώματος στις ελληνικές περιοχές κατά την περίοδο μεταξύ των μέσων του 9ου και του τέλους του 6ου αιώνα π.Χ. Η βάση εκκίνησης της έρευνας ήταν τα ομηρικά έπη, ενώ για την επεξεργασία του θέματος χρησιμοποιήθηκαν αρχαιολογικά και γραμματειακά δεδομένα προερχόμενα από τη συγκεκριμένη εποχή, αλλά και στοιχεία σχετικά με το θέμα προερχόμενα από προγενέστερες ή μεταγενέστερες εποχές. Επίσης συχνά έπρεπε να ανατρέξουμε σε πληροφορίες προερχόμενες από περιοχές εκτός του ελληνικού κόσμου, ώστε να μπορέσουμε να σχηματίσουμε την αναγκαία γενική εικόνα εντός της οποίας έγινε η πραγματεία του θέματος.
Αρχικά, εξετάζονται τα ναυπηγικά δεδομένα, με βάση γραμματειακές πηγές (κυρίως, την περιγραφή του τρόπου ναυπήγησης της σχεδίας του Οδυσσέα), πρωτογενή ευρήματα (ναυάγια) και απεικονίσεις ή ομοιώματα καραβιών. Στο δεύτερο κεφάλαιο εξετάζεται το ομηρικό λεξιλόγιο για τα καράβια: λέξεις για τη μορφή, το σχήμα, τα δομικά στοιχεία, την πλεύση με κουπιά και με πανί, τα συστήματα διεύθυνσης, τον κατάπλου, ώστε να σχηματίσουμε μια όσο το δυνατόν λεπτομερή εικόνα για τα πλοία της Ιλιάδας και της Οδύσσειας. Στο τρίτο κεφάλαιο, η έρευνα εστιάζει στο το φυσικό περιβάλλον εντός του οποίου έπλεαν τα καράβια της ομηρικής εποχής: καιροί, ρεύματα, μορφολογία των ακτών, ορατότητα• επιπλέον, θα εξετάσουμε τις στρατηγικές πλεύσης που καθορίζονταν από το φυσικό περιβάλλον. Στο τέταρτο κεφάλαιο προσπαθούμε να διακρίνουμε τα κίνητρα που οδηγούσαν τους ναυτικούς στην επιλογή της μίας ή της άλλης διαδρομής, καθώς και να εξετάσουμε κάποιες βασικές ρότες. Στο πέμπτο κεφάλαιο διερευνώνται οι γενικότερες αιτίες που οδηγούσαν τους ανθρώπους της ομηρικής εποχής στο θαλάσσιο ταξίδι. Τέλος, στο έκτο κεφάλαιο, και μέσα στο πλαίσιο του θαλάσσιου ταξιδιού, εξετάζονται είναι οι σχέσεις που συνδέουν τον Οδυσσέα με την Ιθάκη, καθώς και η θέση της Ιθάκης στην αντίληψη των ναυτικών της αρχαιότητας.The subject of this dissertation is the conditions of navigation and the expression of nautical experience in Greek societies between the middle of the 9th and the end of 6th centuries B.C. The base of the research is the Homeric epic. The main tools of research were archaeological and literary data from this era; also, we used relevant complementary evidence from earlier and subsequent ages. From time to time it was necessary to use the informatory context of non-Greek societies, in order to enlighten some obscure points and construct the big picture of our subject. At first, we discuss the construction of a ship, using literary sources (mainly, the account of raft building, in the second book of Odyssey), archaic ship relics and ship images or clay models. In the second chapter, we discuss the Homeric nautical vocabulary: words for the shape, the form, the construction of a ship, the sailing, the rowing, the rudder, the rigging and the harborage. The natural environment is the subject of the third chapter; weather, sea currents, coastlines, visibility from the sea and in the sea; besides, we tried to figure out the navigation strategies of Homeric era sailors in this environment and in these conditions. Consequently, we attempted to discern and understand the motives of a sailor to follow a sea route and we try to describe some of these routes. In the fifth chapter, we discuss the main reasons of sea venturing in Homeric era. Finally, we tried to look into the links between Odysseus and Ithaca, as well as the place of Ithaca in Greek nautical cosmos.
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Park, Hyunbae. "The kinetic Sunyaev-Zel’dovich effect as a probe of the physics of cosmic reionization : the effect of self-regulated reionization." Thesis, 2014. http://hdl.handle.net/2152/28093.
Full textAbstract:
We calculate the angular power spectrum of the cosmic microwave background temperature fluctuations induced by the kinetic Sunyaev-Zel'dovich (kSZ) effect from the epoch of reionization (EOR). We use detailed N-body+radiative-transfer simulations to follow inhomogeneous reionization of the intergalactic medium. For the first time, we take into account the "self-regulation" of reionization: star formation in low-mass dwarf galaxies or minihalos is suppressed if these halos form in the regions that were already ionized or Lyman-Werner dissociated. Some previous work suggested that the amplitude of the kSZ power spectrum from the EOR can be described by a two-parameter family: the epoch of half-ionization and the duration of reionization. However, we argue that this picture applies only to simple forms of the reionization history which are roughly symmetric about the half-ionization epoch. In self-regulated reionization, the universe begins to be ionized early, maintains a low level of ionization for an extended period, and then finishes reionization as soon as high-mass atomically cooling halos dominate. While inclusion of self-regulation affects the amplitude of the kSZ power spectrum only modestly (~10%), it can change the duration of reionization by a factor of more than two. We conclude that the simple two-parameter family does not capture the effect of a physical, yet complex, reionization history caused by self-regulation. When added to the post-reionization kSZ contribution, our prediction for the total kSZ power spectrum is below the current upper bound from the South Pole Telescope. Therefore, the current upper bound on the kSZ effect from the EOR is consistent with our understanding of the physics of reionization.text