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Dissertations / Theses on the topic 'Disks'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Grundstrom, Erika Dawn. "Hot Stars with Disks." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/phy_astr_diss/19.

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The evolutionary paths of the massive O and B type stars are often defined by angular momentum transformations that involve circumstellar gas disks. This circumstellar gas is revealed in several kinds of observations, and here I describe a series of investigations of the hydrogen line emission from such disk using detailed studies of five massive binaries and a survey of 128 Be stars. By examining three sets of spectra of the active mass-transfer binary system RY Scuti, I determined masses of 7.1 +/- 1.2 M_sun for the bright supergiant and 30.0 +/- 2.1 M_sun for the massive companion that i

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2

Muranushi, Takayuki. "Lightning in Protoplanetary Disks." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180374.

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3

Cavallius, Maria. "Gas in Debris Disks." Licentiate thesis, Stockholms universitet, Institutionen för astronomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-186017.

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4

Chiang, Eugene Goldreich Peter Martin. "Circumstellar and circumplanetary disks /." Diss., Pasadena, Calif. : California Institute of Technology, 2000. http://resolver.caltech.edu/CaltechETD:etd-09172008-151500.

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5

Pohlen, Michael. "The radial structure of galactic stellar disks surface photometric study on disk galaxies /." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964128535.

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6

Lobo, Gomes Aiara [Verfasser], and Hubert [Akademischer Betreuer] Klahr. "Planet-disk interactions in non-isothermal disks / Aiara Lobo Gomes ; Betreuer: Hubert Klahr." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180502523/34.

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7

Li, Guijun, and 李桂君. "Development of recording technology with FePt recording media and magnetic tunnel junction sensors with conetic alloy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50899776.

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With highly demanding requirement in current emerging cloud storage and personal computers, hard disk drive recording with high stability and high volume has attached much attention in industry and academy. Recording media and recording head feasible for future high-density recording are both crucial to utilize magnetic recording with 1T bit/in2 recording density. Recoding media with FePt for high density and high stability was investigated in this thesis using FePt polymers with imprinting methods and FePt thin films with ion-beam bombardment technologies. The FePt polymers can be patterned

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8

Bastos, Martins Ledo Hugo Ricardo. "A census of nuclear stellar disks in early-type galaxies." Thesis, University of Hertfordshire, 2016. http://hdl.handle.net/2299/17184.

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In this thesis we explored the use of nuclear stellar discs as tracers of the merging history of early-type galaxies. These small structures, just a few tens to a few hundreds of parsecs across, are a common but poorly studied feature of early-type galaxies. They are formed during or shortly after merging events due to the infall of gas, which settles in a disc and leads to the formation of new stars. Initial simulations showed that they should not survive a following major merger and could, therefore, be used to trace the epoch when their host galaxies experienced their last major merger even

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9

Dånmark, Anders. "Volume measurement of wood disks." Thesis, Uppsala universitet, Bildanalys och människa-datorinteraktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-212199.

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At the Department of Forest Products at Swedish University of Agricultural Sciences different metrics for wood are used. The volume of wood disks' is measured using archimedes principle.There are concerns of how accurate this measurement is and a different measuringsystem is wanted. This thesis has investigated the possibility of measuring the disks' volumes with imageanalysis. The recovery error should be less than 1% of the actual volume. In general, there are two methods for recovering an object using imageanalysis, active and passive methods. Compairing active and passive methods, active m

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10

Yoachim, Peter. "Thick disks in external galaxies /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5444.

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11

Pichon, Christophe. "Dynamics of self-gravitating disks." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319818.

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12

BAPTISTA, PAULA MONTEIRO. "TILINGS OF DISKS WITH HOLES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9177@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Coberturas de um disco quadriculado com buracos D são contados de acordo com volume (na variável formal q) e fluxo (em p1, p2, ..., pN). Consideramos propriedades algébricas dos resultados gerados pela função F (p1, p2, ..., pN, q). Para números fixos p2, ..., pN, q > 0 o polinômio f(p1) = F(p1, p2, ..., pN, q) tem todas as raízes reais (e negativas).<br>Tilings of a quadriculated disk with holes D are counted according to vol- ume (in the formal variabel q) and flux (in p1; p2;... pN). We consider algebraic properties of

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13

Savcheva, Antonia Stefanova. "Magnetically torqued thin accretion disks." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36119.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.<br>Includes bibliographical references (leaves 61-64).<br>We consider geometrically thin accretion disks around millisecond X-ray pulsars. We start with the Shakura-Sunyaev thin disk model as a basis and modify the disk equations with a magnetic torque from the central neutron star. Disk solutions are computed for a range of neutron star magnetic fields. We also investigate the effect of different equations of state and opacities on the disk solutions. We show that there are indications of thermal instability in some

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14

Lemke, Bastian. "Freiheitsgrade beim Einsatz Verteilter Disks." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-58078.

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15

Li, Yinan. "Tree indexing on flash disks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20LI.

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16

Gu, Pin-gao. "Turbulence in Keplerian accretion disks /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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17

Roberge, Aki. "Ultraviolet spectroscopy of circumstellar disks." Available to US Hopkins community, 2002. http://wwwlib.umi.com/dissertations/dlnow/3068203.

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18

Isaacs, Sonja [Verfasser]. "Unveiling Accretion Disks - Physical Parameter Eclipse Mapping of Accretion Disks in Dwarf Novae / Sonja Isaacs." München : GRIN Verlag, 2002. http://d-nb.info/1177524554/34.

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19

Józsa, Gyula István Géza. "Grand design warps in galactic disks." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979515076.

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20

Schütz, Oliver. "High-resolution studies of protoplanetary disks." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974449792.

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21

Tazaki, Ryo. "Multiwavelength polarimetric properties of protoplanetary disks." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225407.

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22

Dzanovic, Dajana. "Evolution of galactic disks and spheroids." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3062/.

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In this Thesis the structural properties of galaxies using quantitative 2-dimensional bulge to disk decompositions are analysed across a range of environments and red- shifts. The study of morphological properties of galaxies is undergoing a significant progress since large galaxy surveys such as the Sloan Digital Sky Survey are producing a vast amounts of data enabling properties such as galaxy structure to be analysed on a statistical level. The wide-field imaging available today makes the studies of the nearby and high redshift environments comparable on a similar physical scale and depth.

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23

Creasey, Peter Edward. "Simulating supernova feedback in galaxy disks." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/6349/.

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In this thesis I examine supernova feedback in hydrodynamical simulations of galaxy disks. Understanding this process entails the numerical evaluation of cooling in radiative shocks, and we present a set of simulations using two widely used numerical schemes: smoothed particle hydro- dynamics and adaptive mesh refinement. We obtain a similarity solution for a shock-tube problem in the presence of radiative cooling, and test how well the solution is reproduced. We interpret our findings in terms of a resolution criterion, and apply it to realistic simulations of cosmological accretion shocks on

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24

Walsh, Catherine. "The chemical structure of protoplanetary disks." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534583.

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25

Harris, Robert Jason. "Protoplanetary Disks in Multiple Star Systems." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11194.

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Most stars are born in multiple systems, so the presence of a stellar companion may commonly influence planet formation. Theory indicates that companions may inhibit planet formation in two ways. First, dynamical interactions can tidally truncate circumstellar disks. Truncation reduces disk lifetimes and masses, leaving less time and material for planet formation. Second, these interactions might reduce grain-coagulation efficiency, slowing planet formation in its earliest stages.<br>Astronomy

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26

Chan, Siew Ngan. "Analysis of disks with friction loading." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240397.

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27

Fitzgerald, Alan. "DATA SECURITY IN SOLID STATE DISKS." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604786.

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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Solid state disk characteristics make them ideal for data collection in both harsh environments and secure telemetry application. In comparison to their magnetic counterparts, solid state disks are faster, more reliable, extremely durable and, with changing economies and geometries, more affordable and available in higher capacities than ever before. This paper will discuss solid state dis

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28

Stolker, T., C. Dominik, M. Min, A. Garufi, G. D. Mulders, and H. Avenhaus. "Scattered light mapping of protoplanetary disks." EDP SCIENCES S A, 2016. http://hdl.handle.net/10150/622692.

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Context. High-contrast scattered light observations have revealed the surface morphology of several dozen protoplanetary disks at optical and near-infrared wavelengths. Inclined disks offer the opportunity to measure part of the phase function of the dust grains that reside in the disk surface which is essential for our understanding of protoplanetary dust properties and the early stages of planet formation. Aims. We aim to construct a method which takes into account how the flaring shape of the scattering surface of an optically thick protoplanetary disk projects onto the image plane of the o

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29

Ozkan, Musa. "Boundary layer transition over rotating disks." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/87170/.

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This thesis summarizes results of a combined numerical and experimental study investigating the effects of surface roughness, and of the geometry of the ow domain (confinement) on the boundary{layer transition over rotating disks. Numerically, a three{dimensional enclosed cavity ow in a rotor{stator flow configuration is simulated. The effects induced by surface roughness of the rotor disk and the effects induced by the stator geometry enclosing the ow domain are investigated. The steady{state velocity pro les of the boundary{layer ow on the rotating disk are obtained, subjected to a linear st

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30

On, Sai Tung. "Efficient transaction recovery on flash disks." HKBU Institutional Repository, 2010. http://repository.hkbu.edu.hk/etd_ra/1170.

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31

Curran, Dian Beard. "Magnetic shearing instabilities in accretion disks /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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32

Gorlova, Nadiya Igorivna. "Debris Disks in Open Stellar Clusters." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195908.

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Indirect searches for planets (such as radial velocity studies)show that their formation may be quite common. The planets are however too small and faint to be seen against the glare of their host stars; therefore, their direct detectionis limited to the nearest systems. Alternatively one can study planets by studying their "by-product" -- dust. We see raw material available for planets around young stars, anddebris dust around old stars betraying planet-induced activity. Dust has a larger surface area per unit mass compared with a large body; it can be spread over a largersolid ang

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33

Herbert-Fort, Stephane. "The Outer Disks of Nearby Galaxies." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202752.

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This dissertation presents three observational projects designed to characterize the outer disks of nearby galaxies (beyond the optical radius R₂₅). Until very recently, outer disks remained an elusive and poorly-understood component of disk galaxies. We first present a Large Binocular Telescope (LBT) optical imaging survey of nearby outer disks to examine the basic properties of this component. Our LBT observations indicate that most nearby galaxies host an outer disk with star formation occurring at a very low level. We detect hundreds of outer disk star clusters and show that they typically

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34

Fedele, Davide. "Structure and Evolution of Protoplanetary Disks." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3427197.

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The scope of this thesis is to investigate the structure and evolution of protoplanetary disk. High resolution observational techniques such as high resolution optical/infrared spectroscopy and infrared interferometry are well suited for this purpose. High resolution spectroscopy allow to resolve the velocity profile of disk emission lines and determine some important parameters such as the disk geometry and the physical conditions of the line emitting region. Infrared interferometry allows to spatially resolve and constraint the disk geometry within the planet forming region. The work pres

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35

O'Sullivan, Mark George. "Warping, dust settling and dynamics of protoplanetary disks." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/782.

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36

Čemeljić, Miljenko. "Resistive magnetohydrodynamic jets from protostellar accretion disks." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974114529.

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37

Cemeljic, Miljenko. "Resistive magnetohydrodynamic jets from protostellar accretion disks." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2005/209/.

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Astrophysikalische Jets sind ausgedehnte, kollimierte Massenausflüsse von verschiedenen astronomischen Objekten. Zeitabhängige magnetohydrodynamische (MHD) Simulationen der Jet-Entwicklung müssen den Akrretionsprozess in der Scheibe berücksichtigen, da der Jet aus der Scheibenmaterie gespeist wird. Allerdings ist die simultane Berechnung der Entwicklung von Scheibe und Jet schwierig, da die charakteristischen Zeitskalen unterschiedlich sind. Selbstähnliche Modelle zeigten, daß eine Beschreibung der Jetentstehung aus einer Akkretionsscheibe durch rein magnetische Prozesse möglich ist.<br>In thi

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38

de, Val Borro Miguel. "Studies of Gas Disks in Binary Systems." Doctoral thesis, Stockholms universitet, Institutionen för astronomi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8337.

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There are over 300 exoplanets detected through radial velocity surveys and photometric studies showing a tremendous variety of masses, compositions and orbital parameters. Understanding the way these planets formed and evolved within the circumstellar disks they were initially embedded in is a crucial issue. In the first part of this thesis we study the physical interaction between a gaseous protoplanetary disk and an embedded planet using numerical simulations. In order to trust the results from simulations it is important to compare different methods. However, the standard test problems for

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39

Takahashi, Sanemichi. "Formation and evolution of the protoplanetary disks." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199099.

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40

Lin, Min-Kai, and Andrew N. Youdin. "A Thermodynamic View of Dusty Protoplanetary Disks." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626177.

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Small solids embedded in gaseous protoplanetary disks are subject to strong dust-gas friction. Consequently, tightly coupled dust particles almost follow the gas flow. This near conservation of the dust-to-gas ratio along streamlines is analogous to the near conservation of entropy along flows of (dust-free) gas with weak heating and cooling. We develop this thermodynamic analogy into a framework to study dusty gas dynamics in protoplanetary disks. We show that an isothermal dusty gas behaves like an adiabatic pure gas, and that finite dust-gas coupling may be regarded as effective heating/coo

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41

Caunt, Stuart Edward. "Analytical and numerical models of accretion disks." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265485.

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42

Sohan, Ripduman Singh. "Operating system support for application managed disks." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611297.

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43

Nayakshin, Sergei Victor 1969. "Physics of accretion disks with magnetic flares." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/288916.

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Rapid progress in multi-wavelength observations of Seyfert Galaxies in recent years is providing evidence that X-ray emission in these objects may be produced by magnetic flares occurring above a cold accretion disk. Here we attempt to develop a physically consistent model of accretion disks producing radiation via magnetic flares as well as the optically thick intrinsic disk emission, and apply this model to observations of Active Galactic Nuclei (AGN) and Galactic Black Hole Candidates (GBHCs). The following issues are considered: (1) the pressure equilibrium in the flare region, (2) the ref

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44

Faes, Daniel Moser. "An interferometric view of hot star disks." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-16122015-201029/.

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Optical long baseline interferometry was recently established as a technique capable of resolving stars and their circumstellar environments at the milliarcsecond (mas) resolution level. This high-resolution opens an entire new window to the study of astrophysical systems, providing information inaccessible by other techniques. Astrophysical disks are observed in a wide variety of systems, from galaxies up to planetary rings, commonly sharing similar physical processes. Two particular disk like systems are studied in the thesis: (i) B He-rich stars that exhibits magnetic fields in order of kG

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45

Close, Jacob Louis. "The hydrodynamic stripping of spheroids and disks." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/16131/.

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This thesis presents numerical simulations of the ablation of galaxies and stellar disks. A sub-grid turbulence model is used to improve the accuracy of the results. Firstly simulations of galactic ram pressure stripping are presented. A spherically symmetric galactic halo is subjected to a wind of a number of different Mach numbers, both with and without the turbulence model. The initial, instantaneous stripping is unaffected by the use of the turbulence model. The turbulence model leads to significantly greater levels of long term ablation, which is more consistent with what simple analytic

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46

Moeckel, Nickolas Barry. "Massive stars, disks, and clustered star formation." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3303877.

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47

Rusu, Mara Camelia. "Preparation and properties of isolated Z-disks." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/8829/.

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Z-disks form the boundaries of the sarcomeres, the basic contractile units of muscle cells. Within the Z-line thin filaments containing mainly actin interdigitate and are crosslinked by α-actinin. Ends of the giant proteins titin and nebulin are also anchored in the Z-disk. The Z-line was originally thought to have the purely mechanical function of transmitting contractile force along the myofibrils. However, more recently, the Z-disk has emerged as a highly dynamic structure involved in stress sensing and important signaling pathways that govern muscle homeostasis. In order to fully understan

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48

Nelson, Andrew Frederick. "Dynamics and observational appearance of circumstellar disks." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/288969.

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In my thesis I present a study of the dynamics and observational characteristics of massive circumstellar disks in two dimensions (r, φ) using two complimentary hydro-dynamic codes: a 'Smoothed Particle Hydrodynamic' (SPH) code and a 'Piecewise Parabolic Method' (PPM) code. I also study the detection limits available to radial velocity searches for low mass companions to main sequence stars. This thesis is organized as a series of published or submitted papers, connected by introductory and concluding material. I strongly recommend that readers of this abstract obtain the published versions of

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49

Upton, Robert Stewart. "Detector patterns and crosstalk from optical disks." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289967.

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Crosstalk in the readout channel of a data storage system is obtained by a linear decomposition of the reflected field from the optical disk according to Babinet's principle. Crosstalk is the jitter introduced into the readout signal. Also, the formation of the exit pupil irradiance is described heuristically as the combination of fields in a three beam interferometer resulting from the Babinet decomposition of the reflected disk field. Three detector patterns result. The properties of the detector patterns are affected by media parameters. The media parameters are the reflectivity function of

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50

Moro-Martin, Maria A. "Signatures of planets in circumstellar debris disks." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290124.

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Main sequence stars are commonly surrounded by debris disks, composed of cold dust continuously replenished by a reservoir of undetected dust-producing planetesimals. In the outer Solar System, Kuiper Belt (KB) objects produce dust by mutual or interstellar grain collisions. The orbital evolution of KB dust has been numerically modeled. Its equilibrium radial density distribution can be accurately estimated even though there are inherent uncertainties in the prediction of structure, owing to the chaotic dynamics of dust orbital evolution imposed by resonant gravitational perturbations of the p

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