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.
Results
Showing 1 to 20 of 609 for “"HI"”.
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Using HI stacking to study galaxy properties in the nearby universe (Looking for needles in the HI-stack)
Neutral atomic hydrogen (Hi) is the raw fuel from which the star-forming molecular gas forms and is therefore an important tracer of galaxy evolution. Due to the intrinsic faintness of the Hi emission line (observed at rest at 21 cm), galaxies beyond a few hundred megaparsecs are difficult to …
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HI survey of local group dwarf galaxies
This thesis investigates the HI properties of 3 dwarf irregular galaxies and one blue compact dwarf galaxy of the Local Group. The data set of each dwarf irregular galaxy was obtained with the Karoo Array Telescope (KAT-7) while the blue compact dwarf was observed with the Dominion Radio …
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Deep HI observations of nearby late-type galaxies
This thesis makes use of sensitive Hi observations to map the distribution and kinematics of the low column density neutral hydrogen in late-type nearby mostly isolated galaxies and in the nearby M81 group. Using the KAT-7, GBT and MeerKAT AR1 telescopes, we present in the second chapter a survey …
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Exploring HI asymmetries in real and simulated galaxies
… lead to peculiar and disturbed morphologies, which can be studied using morphometric statistics. The rotational 2D asymmetry parameter, adopted from optical studies, has recently been used to quantify asymmetries in the H i images of galaxies. This is useful since H i disks typically extend …
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The HI super profiles of the THINGS galaxies
We use the HI velocity profiles of The HI Nearby Galaxy Survey (THINGS) galaxies to study the phase structure of the interstellar medium (ISM) and its relation to galaxy properties and morphology. To construct high signal-to-noise (S/N) profiles, we use a method analogous to the stacking method …
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Deep HI observations of nearby late-type galaxies
This thesis makes use of sensitive Hi observations to map the distribution and kinematics of the low column density neutral hydrogen in late-type nearby mostly isolated galaxies and in the nearby M81 group. Using the KAT-7, GBT and MeerKAT AR1 telescopes, we present in the second chapter a survey …
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Investigating the relationship between the HI and optical diameter for a sample of galaxies from the local volume HI survey (LVHIS)
Includes abstract. Includes bibliographical references (leaves 82-88).
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Mpaluxo wa swivuriso swo vulavula hi vavasati eka Xitsonga
… Ndzavisiso lowu wu xopaxopa swivuriso. Swivuriso hi swin’wana swa swikhavisa ririmi leswi welaka ehansi ka matsalwa eka xiyenge xa mfuwo wa rixaka. Swivuriso i mavulavulelo ya ndhavuko lama ya hundzisiwaka kusuka eka rixaka rin’wana ku ya eka rin’wana hi ku vulavula. Eka ndzavisiso lowu ku …
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A performance analysis of the hi-plan structural apparatus
… and specimens are also vital tools for teaching structural mechanics. As such, the Department of Civil Engineering at Virginia Tech has acquired a new apparatus for use as an educational demonstration tool in the area of structural mechanics. This work presents the results of a detailed …
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The HI Lyman-alpha opacity at redshift 2.7 < z < 3.6
… consisting mostly of hydrogen and helium. This intergalactic medium (IGM) is distributed in large-scale filaments as part of the overall cosmic web. The luminous extragalactic objects that we can observe today, such as galaxies and quasars, are surrounded by the IGM in the most dense regions …
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Modelling transcription factors diffusion in 3D using Hi-C data
… can upregulate or downregulate the rate at which transcription occurs. Their main mechanism of functioning is described by their ability to interact to DNA, namely, to find their target site and bind to it. In the search mechanism also known as facilitated diffusion, TFs can float freely …
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Compact Galactic Neutral Hydrogen Clouds in the GALFA-HI Survey
… has revealed new structure. Using the GALFA-HI survey, we have discovered five populations of compact neutral hydrogen clouds. We began by developing a machine-vision algorithm to identify compact clouds in the GALFA-HI Data Release 1. Based on position, velocity, and linewidth we separated …
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Investigating mechanisms of genome folding by single-cell Hi-C
… years researchers have begun to reveal the hierarchy of mammalian DNA folding from the 10 nm fibre to the intact whole genome. One of the key approaches used is the single-cell Hi-C. My lab and I developed a single-cell Hi-C protocol that combines imaging and Hi-C processing on the same …
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Using Polarised HI Absorption to Estimate Distances to Supernova Remnants
… vital supplement to astronomical observations. While in general, the angular extent and surface brightness of a supernova remnant are readily observed, knowledge of its size, kinematics, energy, age, and evolution can only be inferred through distance measurements. Unfortunately, distance …
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A HI search for galaxies hidden by the Galactic bulge
In this thesis, a deep neutral hydrogen (HI) galaxy search for galaxies hidden by the Galactic Bulge is presented. The HI Parkes deep HI Zone of Avoidance (ZOA) survey has been extended towards the higher latitudes in the Galactic Bulge region. The surveyed region covers 332° ≤ l ≤ 36° for the …
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The Galaxy Velocity Function from MIGHTEE-HI Early Science Data
… of MIGHTEE-H I Early Science data is presented. This is the first velocity function that is based on a blind radio interferometric survey. As a precursor, understanding the systematics that affect the Early Science velocity function will optimise the full survey's analysis. PYMULTINEST and the …
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The automated detection and multiwavelength properties of LADUMA HI galaxies
In this study, we investigate the neutral atomic hydrogen (HI) and star formation history (SFH) properties of 104 low redshift (0 < zHI < 0.088) galaxies from the Looking At the Distant Universe with the MeerKAT Array (LADUMA) survey. LADUMA is a deep and narrow HI emission survey underway with the …
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Hi-Low : new semi public space in the high-rise
… of Korean classic style, inviting star architects or holding international competitions. But, the reality of their design does not really express any new voice. Typical floor -plan is multiplied in vertical, served three or four units, connected by weird mirror-surrounded elevators and …
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Nkambisiso wa vundzeni bya dikixinari ya ririmi ra Xitsonga hi M. M. Marhanelele na V. Bila hi ku komgomisa eka mavitovito lama kongomisaka eka vahnu
… rixaka Dikixinari ya ririmi ra Xitsonga (2016) hi M.M Marhanele and V. Bila. Ku na swilo swimbirhi leswi ndzavisiso lowu wu nga langutana na swona ngopfu, ku nga tihlamuselo na xivumbeko xa mavitavito lama kongomisaka eka vanhu. Ndzavisiso lowu wu endliwe hi ku landza tidizayini timbirhi, ku nga …
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