Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Far ultraviolet"”.
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The far-ultraviolet spectroscopy of molecules of astrophysical interest
… molecules are seen near hot OB-type stars whose far-ultraviolet emission is intense. Laboratory spectroscopy of such molecules will lead to a better understanding of their astrophysical behaviour, in particular Celestial Masers. This thesis is preoccupied with the spectroscopy of H$_{2}$O, …
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Estimation of electron density in the nighttime ionosphere based on remote sensing of the 135.6 nm far ultraviolet emission
The student, Dimitrios Iliou, accepted the attached license on 2016-07-15 at 17:33.
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Observations of Non-Migrating Tides in the Middle Thermosphere
… thermospheric "gap" of tidal observations. Using far ultraviolet (FUV) observations of the Earth, the recent NASA GOLD and ICON missions retrieve thermospheric parameters, the former from geostationary orbit (GEO) and the latter from low Earth orbit. Both missions infer the daytime column O/N2 …
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Starbursts in the UV bright interacting galaxies NGC 3395 and NGC 3396
We have obtained ultraviolet and visible wavelength images for the interacting galaxies, NGC 3395/6, using the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope (HST). The images show many isolated sources of ultraviolet emission which are young star forming regions with ages …
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Theoretical and experimental investigation into the IR-VUV ion dip spectroscopy of amino acids and analogue systems
Amino acids are among the fundamental building blocks of life, and as such have been, and continue to be, of much interest for study. While gas phase spectroscopic studies can be very useful in obtaining information about molecular species (in this case various naturally occurring amino acids), the …
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A Search For Warm-Hot Intergalactic Matter in the Local Sheet of Galaxies
… detected in background sources observed by the Far-Ultraviolet Spectroscopic Explorer (FUSE). FUSE spectra of targets spanning the entire sky have been examined to distinguish the WHIM in the Sheet from other sources. These observations suggest that the Sun is offset from the plane of the Local …
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Repair in Ehrlich Ascites Tumor Cells
… tumor cells (EAT), using ionizing radiation, far ultraviolet light (254 nm) or near UV light (365 nm) in combination with 8-methoxypsoralen. UDS was scored by grain counts in autoradiographs following the incorporation of tritium-labelled thymidine. The amount of UDS after each of these agents …
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Principles of quantum dot photophysics and applications to luminescent downshifting
… of luminescent downshifting from the near-ultraviolet to the short-wavelength infrared, the far-ultraviolet to the visible, and the ultraviolet to the mid-wavelength infrared. Unique challenges are addressed for each wavelength region to achieve increases of 10-55% absolute in the external …
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ASSESSING THE ROLE OF EXTERNAL PHOTOEVAPORATION OF PROTOPLANETARY DISCS IN NEARBY STAR-FORMING REGIONS
… shapes disc dynamics across a broad range of far-ultraviolet (FUV) radiation fields, focusing on nearby star-forming regions within 500 pc. Using numerical disc evolution models, I show that external photoevaporation can efficiently truncate discs and shorten their lifetime even under weak FUV …
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Mid-Infrared Studies of Galactic sources: Probing the Relationship Between Polycyclic Aromatic Hydrocarbons and their Physical Environment
… hydrocarbons (PAHs) after the absorption of a far-ultraviolet (FUV) photon. PAHs are astronomically significant in that they contain up to 15% of the cosmic carbon inventory and play an important role in the physical and chemical processes of the ISM such as, for example, the gas heating and …
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The Importance of Photoevaporation in the Evolution of Protoplanetary Discs
… process, variably finding the X-ray, Extreme Ultraviolet, or Far Ultraviolet. These paradigms make very different predictions for the amount of mass lost to the winds, and consequently how important they are for disc evolution. The primary aim of the thesis is to tackle this uncertainty from …
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Far-UV to Mid-IR Spectral Energy Distributions of Nearby Merging Galaxies
… galaxies. I perform SED analysis from the far-ultraviolet (FUV) to the mid-IR on a sample of 49 merging galaxies and 49 statistically-matched control galaxies in the nearby universe. I find that the SED AGN luminosity correlates with the [OIII] luminosity, a common indicator of AGN power. I …
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The automated detection and multiwavelength properties of LADUMA HI galaxies
… spectral energy distribution (SED) fitting to far-ultraviolet (FUV) to far-infrared (FIR) multiband photometry of our HI sample, thereby determining their stellar masses (M∗), star formation rates (SFRs), and star formation histories (SFHs). We explore the relationship between galaxies' HI and …
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Automated Detection and Analysis of Low Latitude Nightside Equatorial Plasma Bubbles
… along equatorial to low latitudes. To do this, far ultraviolet (FUV) emission observations of the recombination of O$^+$ with electrons via the Global-Scale Observations of the Limb and Disk (GOLD) mission are analyzed. GOLD provides consistent data from geostationary orbit with the eastern …
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Development and evaluation of ultraviolet systems to enhance food safety and food security
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Overexpression, purification and ligand interaction studies of intact membrane sensory kinases from enterococci: towards agonist and antagonist screening
… protein. Using the stabilised purified protein, far-ultraviolet (180-260 nm) SRCD revealed that the purified protein maintained structural integrity following the relatively harsh purification methods employed for this membrane protein. Measurements in this region also revealed that addition of …
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Studying the Large Scale Structure and interstellar Medium of Galaxies During the Epochs of Peak Cosmic Star formation and Reionization With Infrared Fine Structure Lines
… environments, such gas irradiated by stellar far-ultraviolet (FUV) photons or X-rays from accreting supermassive black holes, called active galactic nuclei (AGN). The transparency of these lines to dust and their high escape fractions into the intergalactic medium (IGM) render them as useful …
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Stability of microbial transglutaminase and its reactions with individual caseins under atmospheric and high pressure
… protein unfolding. The spectra in the far ultraviolet region showed that increasing high pressure and high temperature lead to alterations in the secondary structure. The mathematical algorithms CONTIN used to calculate secondary structures stated that the 24.5% of alpha-helix of native …