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Dissertations / Theses on the topic 'Spiral'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Goodyear, David J. "Development of single-point spiral-scan imaging, spiral-SPRITE." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ65489.pdf.

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2

Tuerk, Tobias. "Mehrschicht-Spiral-Computertomographie." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-80149.

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3

Grand, R. J. J. "A numerical study of spiral galaxies and dynamical effects of spiral arms." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1433765/.

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We use high-resolution numerical simulations of disc galaxies to study spiral arms and their dynamical influence on nearby stars. We find that in the numerical simulations the spiral arms are winding, transient features whose pattern speeds decrease with radius in such a way that the pattern speed is almost equal to the rotation curve of the galaxy. We validate this for normal and barred-spirals, and demonstrate that there is no significant offset of different star-forming tracers across the spiral arm. We show from the dynamics of nearby star particles that star particles are drawn towards an

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4

Tylstedt, Sven. "The Human Spiral Ganglion." Doctoral thesis, Umeå University, Clinical Sciences, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-77.

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<p>Our knowledge of the fine structure of the Human Spiral Ganglion (HSG) is still inadequate and new treatment techniques for deafness using electric stimulation, call for further information and studies on the neuronal elements of the human cochlea. This thesis presents results of analyses of human cochlear tissue and specimens obtained during neurosurgical transpetrosal removal of life-threatening meningeomas. The use of surgical biopsies produced a well-preserved material suitable for ultrastructural and immunohistochemical studies on the human inner ear. The SG was studied with respect to

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5

Azabi, Y. O. "Spiral photonic crystal fibers." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/19372/.

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This thesis is concerned with the study of special types of photonic crystal fibers (spiral) and their optical properties. The work is carried out using simulation techniques to obtain the modal field profile and properties for the designs. The method used in solving the Maxwell’s equations is the full vectorial finite element method with the implementation of penalty function and perfectly matched layer. The penalty function is used to eliminate nonphysical solutions. The perfectly matched layer is integrated to absorb rays of light traveling away from the core. These rays are absorbed by the

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6

Kranz, Thilo. "Dark matter in spiral galaxies." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964708000.

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7

Chu, Haobing. "Is spiral modulation really useful?" Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60140.

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The performance analysis of modulation techniques has been studied extensively. In this thesis, we investigate the performance of a new modulation technique called spiral modulation. Spiral modulation uses complex spirals in the complex plane to modulate data and form complex signals. Spiral modulation was proposed by Astrapi Corporation and the company claimed that spiral modulation is better than the conventional modulations and can exceed the Shannon limit. In this thesis, we explore the potential of spiral modulation and verify the claims by using MATLAB simulation according to the Astrapi

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8

Dubé, Frédéric. "Spiral irradiation in stereotactic radiosurgery." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0016/MQ55049.pdf.

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9

Säll, Harald. "Spiral Grain in Norway Spruce." Doctoral thesis, Växjö universitet, Institutionen för teknik och design, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-538.

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Wood is a major construction material that is used in many contexts, and for different purposes. Serious problems may arise, however, when moisture related deformations as twist occur in wood used in different types of building structures, joinery and furniture. Twist can be explained to a great degree by the helical deviation of the grain angle in relation to the longitudinal direction of the log or the sawn board. Wood fibres form a spiral within the tree, and this is a natural occurrence that is named spiral grain. The wood fibres close to the pith in Norway spruce form a left-handed spiral

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10

Dubé, Frédéric 1973. "Spiral irradiation in stereotactic radiosurgery." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29884.

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The aim of stereotactic radiosurgery is to deliver a high and uniform radiation dose to the target volume and a minimized dose to the surrounding healthy tissue. Various linac-based radiosurgical techniques are used clinically: multiple non-coplanar converging arcs, dynamic arc rotation, and conical rotation. The techniques differ in their beam distribution over the patient's head.<br>A study of the beam distribution characteristics for the clinical linac-based radiosurgical techniques is presented. Two spiral linac-based radiosurgical techniques are developed: the uniform dose-rate spiral irr

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11

Kendall, Sarah Anne. "Spiral structure in nearby galaxies." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611638.

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12

Diaz, Beltran A. I. "Chemical abundances in spiral galaxies." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372064.

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13

Mohamed, Mohamed Yousri Abdelmeguid. "Spiral Groove Bearing Multiphysics Modeling." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75650.

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Cone crushers are widely used in the mining, mineral processing and quarrying segments of the industry to crush ores and large rocks. In such machinery, the load to be carried is rather heavy and the motion is gyratory which creates a need for a bearing set that can withstand such severe conditions. Sandvik AB is a high-technology Swedish engineering group specialized in tools and tooling systems for metal cutting, equipment, as well as tools and services for the mining and construction industries. One of their products relevant to the mining industry is the cone crusher which utilizes a 3-pie

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14

Yegorova, Iryna. "Dark matter in spiral galaxies." Doctoral thesis, SISSA, 2007. http://hdl.handle.net/20.500.11767/4184.

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During the last few decades, it has been discovered that most of the material in the Universe is invisible. Since it interacts only gravitationally with the rest of the Universe components. From the latest measurements of WMAP satellite we know that the Universe consists of 4% Baryons, 22% Cold Dark Matter, 74% Dark Energy. Now it is clear a wonderful time to study cosmology. Using the latest technological advances we have obtained detailed picture of the early Universe and maps of the distribution of matter on the largest scales in the Universe today. And we have a physical model for the orig

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15

Wartenberg, Susanne. "Vergleich der Niedrigdosis-Spiral-Computertomographie mit der konventionellen Spiral-Computertomographie in der Akutdiagnostik von Flankenschmerzen." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-748.

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16

McFadden, Michael. "Analysis of the equiangular spiral antenna." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31726.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Scott, Waymond; Committee Member: Eslinger, Owen; Committee Member: Ingram, Mary; Committee Member: Peterson, Andrew; Committee Member: Smith, Glenn. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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17

Bohner, Georg. "Schlaganfall-Bildgebung mittels Mehrschicht-Spiral-CT." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974114308.

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18

Mora, Marcelo D. "Star clusters in unperturbed spiral galaxies." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-92728.

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19

Buck, Michael Charles. "Multifunctional, multipolarized sinuous and spiral antennas." Connect to online resource, 2007. 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:3256410.

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20

Webb, Thomas Andrew. "Power losses in spiral bevel gears." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/27950/.

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This dissertation describes a numerical modelling strategy for characterising the windage of a spiral bevel gear rotating within a static shroud. The techniques employed include the use of a parametric solid model, and flow field modelling using computational fluid dynamics (CFD) software. A number of hypothetical physical alterations are made to a control system consisting of a gear and a shroud, based on those found in a Rolls-Royce aero engine. Windage is a parasitic power loss that occurs when a gear does work on air and oil within a gas turbine internal gearbox. It leads to degradation of

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21

Yousif, Ahmed. "The design of spiral bevel gears." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577533.

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Spiral bevel gears are used widely in the transmission systems of several mechanical applications. The design of spiral bevel gears is very complicated. This is due to the complexity of the gear tooth geometry. This research concentrates on a special type of spiral bevel gears, the Palloid spiral bevel gears. The design methodology is based on the concepts of the machine kinematics. This delivers a numerical model of the spiral bevel gear tooth surfaces. The concept of a three dimensional vector analysis is applied. In addition, the condition of the tangential contact between the meshing surfa

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22

Foulkes, Andrew J. "Drift and meander of spiral waves." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507172.

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23

O'brien, Jonathan. "Medium Power, Compact Periodic Spiral Antenna." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4926.

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Historical, well developed, procedures for RF design have minimal emphasis on exploring the third dimension due to the difficulty of fabrication. Recent material advancements applicable to 3D printing have brought about low-loss thermoplastics with excellent mechanical properties. Research into depositing conductive inks onto arbitrary 3D shapes has achieved resolutions better than 50 μm with conductivity values approaching that of copper cladding. The advancements in additive manufacturing have improved reliability and repeatability of three dimensional designs while decreasing fabrication ti

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24

Ward-Thompson, Derek. "A polarisation study of spiral galaxies." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6654/.

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Optical polarimetry results are presented for four spiral galaxies: NGC 5194 (M51), NGC 1068, NGC 4565 and NGC 4594 (Ml04). M51 and NGC 1068 show spiral polar isation patterns which are interpreted as indicating a spiral magnetic field in each case. NGC 4565 and M104 show polar isations in their dust lanes which are parallel to their galactic planes, and which are interpreted in terms of a magnetic field in the plane of each. It is hypothesised that the observed magnetic fields may be linked to galactic shocks. A discussion of the origin of galactic magnetic fields concludes that there is no e

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25

Handschuh, Robert Frederick. "Thermal behavior of spiral bevel gears." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1057162219.

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26

Smith, Claire E. "Breaks that break the burnout spiral." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1546092217477005.

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27

Sadeghi, Maryam. "Modeling and simulation of spiral concentrators." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69372.

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Les spirales gravimétriques ou « spirales » sont des équipements de séparation par gravité utilisés pour la valorisation des minerais pour lesquels la densité des minéraux de valeur est significativement différente de celle de gangue. C'est le cas du traitement du minerai de fer discuté dans cette thèse. Les spirales sont préférées à d'autres séparateurs car elles sont peu coûteuses, simples à utiliser, pratiquement sans entretien, peu exigeantes en énergie et n'utilisent pas de réactif. Malgré ces qualités attrayantes et contrairement à la flottation, peu d'études sont consacrées à examiner l

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28

Mora, Marcelo. "Star clusters in unperturbed spiral galaxies." kostenfrei, 2008. http://edoc.ub.uni-muenchen.de/9272/.

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29

Grobler, Jac De Clercq. "Enhanced analysis of spiral separation performance." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/57481.

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Standard material analysis methods used in the heavy minerals industry to characterise spiral separation behaviour is unable to fully quantify performance differences between the available spiral profiles of today. This study proposes an enhanced method to analyse spiral products to identify key separation performance differences between different spiral profiles for specific feed materials. The enhanced analysis method has two major components. The first involves a material characterisation method that was developed using the analytical capability of QemscanR to simultaneously quantif

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30

Bohner, Georg. "Schlaganfall-Bildgebung mittels Mehrschicht-Spiral-CT." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2005. http://dx.doi.org/10.18452/15190.

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Es wurde der Einsatz der Mehrschicht-Spiral-CT (MS-CT) zur zerebralen Perfusionsbildgebung und zur zerviko-zerebralen Angiographie bei Schlaganfallpatienten evaluiert. Bei 52 Patienten mit klinischen Zeichen einer akuten Ischämie wurde im Mittel 3,4 Stunden nach Symptombeginn an einem MS-CT Gerät eine CT-Perfusion (CTP) durchgeführt. Parameterbilder der zerebralen Blutperfusion (CBP), des zerebralen Blutvolumens (CBV) und der mittleren Transitzeit (MTT) wurden generiert, Perfusionsstörungen ermittelt und mit bildgebenden sowie klinischen Verlaufskontrollen korreliert. Eine CT-Angiographie (CTA

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31

Kopka, Lars. "Spiral-CT zur Diagnostik fokaler Leberläsionen." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2001. http://dx.doi.org/10.18452/13773.

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Zur Optimierung der Diagnostik fokaler Leberläsionen mittels Spiral-CT, einschließlich der Mehrschicht-Technik, wurden methodische Aspekte evaluiert und experimentelle Untersuchungen durchgeführt. Die erzielten Ergebnisse konnten anschließend in klinischen Studien überprüft werden. Es stellte sich dabei heraus, daß die diagnostische Aussagekraft der Spiral-CT der Leber erheblich von den angewendeten Untersuchungsparametern wie Schichtdicke, Pitchfaktor, Rekonstruktionsintervall und Röhrenstrom abhängig ist. Diese sollten optimal aufeinander abgestimmt werden, um ein möglichst hohes Kontrast-z

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32

Caswell, Eric D. "Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/25963.

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This dissertation details the development of the star spiral antenna and demonstrates the advantages of the star spiral when used in a wideband array with variable element sizes. The wideband array with variable element sizes (WAVES) is a multi-octave array that uses different sized circular Archimedean spirals for each octave of frequency coverage. A two-octave WAVES array has been presented in the literature, but a gap in the two-octave frequency coverage exists along the principal axes. The star spiral antenna was developed to eliminate the performance gap in the WAVES array. The star sp

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33

Henning, Wade A., and Daniel T. Walter. "Spiral development in action: a case study of spiral development in the Global Hawk Unmanned Aerial Vehicle program." Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/9980.

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MBA Professional Report<br>Evolutionary Acquisition (EA) is the established acquisition strategy of choice for the Department of Defense (DoD) and spiral development (SD) is the preferred process to execute this tactic. SD is used when the end-state of a weapon system is unknown, and its purpose is to get valuable capability into warfighters' hands much more quickly than before, even if the deliverable is only a partial solution. This approach is markedly different than the traditional DoD acquisition approach that too often fielded weapon systems late, over budget and with obsolete technology

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34

Bengtsson, Nadine, and Nadja Olsson. "En hemtjänstgrupp fast i en negativ spiral?" Thesis, Halmstad University, School of Social and Health Sciences (HOS), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-456.

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<p>Abstract </p><p>We have chosen to figure out why a majority in a home-help service group in west of Sweden is, or has been sick-listed. The purpose with our work has been to investigate our area to be able to come up with different factors which can have contributed to the high numbers of this particular group. We have worked with qualitative method and conversation-interviews to be able to answer our purpose at the best way. We had separate interviews with the ten employees at their work and these interviews we chose to record with a computer. The result we got were that the group had exis

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35

Proctor, Robert Neil. "Metallicities and stellar populations in spiral bulges." Thesis, University of Central Lancashire, 2002. http://clok.uclan.ac.uk/20825/.

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A major aim of current astrophysical research is the development of models of galaxy formation that are consistent with observational data. Until recently, the main tools of such research were broadband colours. However, the Lick system of indices has recently provided researchers with a more accurate tool for probing galaxy populations. The work in this thesis compares Lick indices in bright elliptical galaxies with those in the bulges of spiral galaxies, in an effort to compare, contrast and constrain their star formation histories. Long-slit spectroscopic observations of line-strengths and

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36

McKenzie, Andy. "Modelling spiral waves in Xenopus laevis oocyte." Thesis, University of Canterbury. Mathematics and Statistics, 1997. http://hdl.handle.net/10092/6954.

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An investigation was made into the spiral waves solutions for the Atri et al model, a partial differential equation model for Ca²⁺ dynamics in the Xenopus laevis oocyte. Spiral wave solutions, both stable and unstable, were found to exist in the oscillatory regime for this model. The spiral wave solutions were found to have a period that decreased as the initial IP₃ bolus increased. Increasing the initial IP₃ bolus also lead to destabilisation of the spiral waves solutions. After the break up of spiral wave solutions complex spatio-temporal patterns occurred. In some cases spirals reformed aft

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37

Charette, Laurent. "Lattice Symmetry Breaking Perturbation for Spiral Waves." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24292.

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Spiral waves occur in several natural phenomena, including reaction fronts in two-dimension excitable media. In this thesis we attempt to characterize the motion of the spiral tip of a rigidly rotating wave and a linearly travelling wave in the context of a lattice perturbation. This system can be reduced to its center manifold, which allows us to describe the system as ordinary differential equations. This in turn means dynamical systems methods are appropriate to describe the motion of the tip. It is in such a context that we work on spiral waves. We study perturbed rotating waves and travel

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38

Hinostroza, Israel. "Design of wideband arrays of spiral antennas." Phd thesis, Supélec, 2013. http://tel.archives-ouvertes.fr/tel-00830469.

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This work focuses on the design of wideband dual polarized arrays using spiral antennas. These antennas are known for having wideband properties. But, due to the presence of the grating lobes, the bandwidth is decreased when using an array instead of a single antenna. In order to obtain a dual polarized array, it is needed to use elements of opposite polarization, which creates great distances between same polarization elements, meaning an earlier presence of the grating lobes. In this work, an analytic method was developed to estimate the bandwidth of the spiral arrays. This method showed tha

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39

Tweedie, Andrew. "Spiral 2D array designs for volumetric imaging." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23167.

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The use of linear phased arrays in NDE inspections has recently grown, resulting in faster inspection of components. Phased arrays are also used in underwater sonar and biomedical imaging. All applications require 2 dimensional (2D) arrays, capable of volumetric imaging, to further increase scan speed, and to allow tighter focussing on targets. However, 2D arrays have not found widespread use, mainly due to the large number of elements required to implement standard periodic designs. Alternative array configurations that feature a much lower element count offer a more pragmatic solution. This

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40

Bell, Caroline Hélène Christiane. "The London Market Excess of Loss Spiral." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/372297/.

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This thesis explores the London Market Excess of Loss Spiral (“LMX Spiral”), a phenomenon based upon excess of loss reinsurance contracts that developed within the London reinsurance market of the 1980s. The unwinding of the LMX Spiral was a key factor in the crisis the Lloyd’s insurance market had to face in the early 1990s. However, whilst the crisis resulted in a wave of litigation in the English courts, there is no legal appraisal of the additional element of risk brought by the LMX Spiral itself. The case law instead focuses on the duties of the underwriters and various agents that fuelle

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41

Iranshahi, Ashkan. "Static Mixing Spacers for Spiral Wound Modules." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1352121892.

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42

Zhang, Piyou. "Slotted Spiral Antennas and Widebandwidth Array Systems." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1222311888.

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43

Kramer, Bradley Allen. "Spiral antenna miniaturization with high-contrast dielectrics." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407225517.

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44

Kotzé, Ian Kincaid. "Spiral dynamics : an expression of world views." Pretoria : [S.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-10172009-120729/.

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45

Moulis, Antony. "Drawing experience : Le Corbusier's spiral museum projects /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16243.pdf.

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46

Zambri, Mohamed K. S. "Rotating spiral prototype contactor : design and demonstration." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7022/.

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Continuous counter-current flow of two phases in a rotating spiral channel is reported for the first time. In the rotating spiral channel, centrifugal force is much greater than gravity and is used to overcome surface forces to produce a nearly flat uniform interface. The position of the phase interface and the flow rate ratio of the phases are under full control by changing the rotation rate and the pressure gradient. The work in this research has been divided into two main parts. First is the design of the rotating spiral apparatus using the existing wide channel model to decide the spiral c

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47

Langham, Jacob. "Spiral pinballs, cardiac tissue and deforming capacitors." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/90330/.

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‘Spiral pinballs’ are resonantly drifting spiral waves in excitable media that reflect from boundaries. Instead of reflecting at an angle equal to the one at which they approach the boundary—like a ray of light reflecting from a mirror—they reflect in a preferred direction. This invites comparison with a number of other complex systems that behave as nonspecular billiards, including bouncing droplets on a vibrated bath, swimming microorganisms and segments of chemical waves. In the first part of this thesis, we study the trajectories of spiral pinball reflections. A catalogue of interesting be

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48

Llamas, Ruben A. "Curved spiral antennas for underwater biological applications." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1876.

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We developed curved spiral antennas for use in underwater (freshwater) communications. Specifically, these antennas will be integrated in so-called mussel backpacks. Backpacks are compact electronics that incorporate sensors and a small radio that operate around 300 MHz. Researchers attach these backpacks in their freshwater mussel related research. The antennas must be small, lightweight, and form-fit the mussel. Additionally, since the mussel orientation is unknown, the antennas must have broad radiation patterns. Further, the electromagnetic environment changes significantly as the mussels

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49

Salucci, Paolo. "Dark and luminous matter in spiral galaxies." Doctoral thesis, SISSA, 1986. http://hdl.handle.net/20.500.11767/4386.

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50

Ghosh, Himel. "A Search for the Smallest Supermassive Black Holes." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253492291.

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