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Dissertations / Theses on the topic 'Ringi System'

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Published: 5 June 2025

Last updated: 2 August 2025

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1

Sutradhar, Nitai Chandra. "The study of ring-spinning with particular reference to rotating rings." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329210.

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2

EPLEE, ROBERT EUGENE JR. "SPOKES IN SATURN'S B RING: DYNAMICAL AND PHYSICAL PROPERTIES DEDUCED FROM VOYAGER SATURN RING IMAGES." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184056.

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The two Voyager spacecraft discovered small-scale, radially-extended features in the central region of Saturn's B Ring. These "spokes" are "clouds" of submicron-size ice grains which are electrostatically levitated above the ring plane and which appear to travel about Saturn in Keplerian orbits (Smith et al., 1981, Science 212, 163-191). This research project is a study of the dynamical and physical properties of spokes as deduced from Voyager Saturn ring images. An analysis of the orbital motion of two dynamically-anomalous spokes, in particular, has set limits on the charge-to-mass ratios of

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3

Flassig, Robert Johann. "Dusty ringlets in Saturn’s ring system." Master's thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/2704/.

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Recently, several faint ringlets in the Saturnian ring system were found to maintain a peculiar orientation relative to Sun. The Encke gap ringlets as well as the ringlet in the outer rift of the Cassini division were found to have distinct spatial displacements of several tens of kilometers away from Saturn towards Sun, referred to as heliotropicity (Hedman et al., 2007). This is quite exceptional, since dynamically one would expect eccentric features in the Saturnian rings to precess around Saturn over periods of months. In our study we address this exceptional behavior by investigating the

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4

Adamson, Alan, and Albert Berdugo. "Helicopter Slip Ring Replacement System." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604271.

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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>Most helicopter programs require the acquisition of parameters from the rotating systems. Historically, these systems made use of electromechanical slip rings for the transfer of power, control, and data from within the helicopter's cabin to the rotating hardware. Slip rings are primarily used in dedicated instrumentation vehicles and are not commonly used in production platforms

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5

Slater, Rachel. "Polyfunctional heteroaromatic fused ring systems." Thesis, Durham University, 2005. http://etheses.dur.ac.uk/2755/.

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Many current therapeutic agents are based on a core structure consisting of a fused ring heteroaromatic polycyclic system. Methodology for the synthesis of a range of these structurally diverse heteroaromatic derivatives is therefore highly desirable and short, high yielding, regioselective and flexible routes to such systems is very important. Our methodology utilises nucleophilic substitution reactions between pentafluoropyridine (PFP) and its derivatives, and various binucleophiles, e.g. The methodology has also been extended to 4-substituted tetrafluoropyridine derivativesand different bin

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6

Dewis, Mark L. "Synthetic approaches towards the herbicidin ring system." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335628.

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7

Hentschel, Martina. "Mesoscopic wave phenomena in electronic and optical ring structures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2001. http://nbn-resolving.de/urn:nbn:de:swb:14-1008319980781-38394.

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Gegenstand dieser Arbeit sind Wellenphänomene in mesoskopischen Ringstrukturen. In Teil I der Arbeit befassen wir uns mit spinabhängigem Transport von Elektronen in effektiv eindimensionalen Ringen in Gegenwart inhomogener Magnetfelder. Wir benutzen die exakten Lösungen der Schrödinger-Gleichung im allgemeinen nicht-adiabatischen Fall in einem Transfer-Matrix-Formalismus und untersuchen Auswirkungen von geometrischen Phasen auf den Magnetwiderstand. Für den Spezialfall eines Magnetfeldes in der Ringebene sagen wir einen interessanten Spin-Flip-Effekt vorher, der die Steuerung der Polarisations

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8

Wong, William Siu-Cheong. "Optical pulse storage rings and transmission systems." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36577.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.<br>Includes bibliographical references (leaves 67-71).<br>by William Siu-Cheong Wong.<br>M.S.

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9

Lingard, Hannah. "Cascade approaches to decahydroquinoline ring systems." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e0ff1123-eae7-47aa-b377-1a12346d2538.

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The aims of this project were to develop a cascade approach towards decahydroquinoline frameworks (Scheme I) and apply this to the synthesis of decahydroquinoline-containing natural products such as lycopodine, cermizine B and lepadin D (Scheme I). Scheme I. Several linear precursors were synthesized via a modular strategy. For example, lycopodine linear precursor i was synthesized in a total of 12 steps (Scheme II). Scheme II. Conditions for cyclization and hydrogenation were tested, with the diastereoselectivity examined in each system. For example, the lepadin linear precursor ii produced t

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10

Kiss, Emily. "Diasterodivergent synthesis of fused ring systems." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:37545702-38f9-4bb5-a233-69a296387792.

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Introduction: We envisioned using phase transfer catalysis (PTC) to develop asymmetric carba-6p- electrocyclisations. We believed that the configurational lability of 6p systems could be reduced by constraining them within a ring system. Results and Discussion: En route to the synthesis of a starting material for the transannular electrocyclisation reaction, we noticed that a 5-5-3 fused ring system had formed, in one step, from a linear precursor and as a single diastereomer. We synthesised both geometric isomers of the starting materials, and unexpectedly, the E or Z isomers cyclised to form

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11

Moyer, Nathan Thomas. "A knapsack-type cryptographic system using algebraic number rings." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/n_moyer_032610.pdf.

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12

Le, Vezouet Ronan. "Synthesis of the CDEF ring system of lactonamycin." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409312.

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13

Chambers, Lindsey Starr. "Numerical modeling of Saturn's satellites and ring system /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.

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14

Engle, James Blaine. "A computer-assisted tree-ring chronology composition system." Thesis, The University of Arizona, 2000. http://hdl.handle.net/10150/291685.

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The design and implementation of a computer-assisted tree-ring chronology composition system for dendrochronology is described in this thesis. Methods for tree-ring growth sequence pattern matching, hierarchical composition of master chronologies, and analytical quality control are discussed in detail and systematically implemented in the CROSSDATE program in a highly visual, graphic environment. The objective of this work is to provide dendrochronologists with a robust set of tools for comparing the relative growth patterns of tree-ring samples for purposes of dating the samples and composing

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15

Owoare, Richard Boakye. "Synthetic studies towards the ABC-ring system of ingenol." Thesis, King's College London (University of London), 2005. https://kclpure.kcl.ac.uk/portal/en/theses/synthetic-studies-towards-the-abcring-system-of-ijngenol(9dda8c2c-34ee-4c9a-8fc7-47a1be0c9d9f).html.

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16

Lu, Yingzi. "Polycyclic and oligocyclic phosphorus-nitrogen ring systems." [S.l.] : [s.n.], 2006. http://www.digibib.tu-bs.de/?docid=00005216.

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17

Robertson, G. M. "Synthesis of ring systems via radical reactions." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353927.

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18

Longthorne, Darren Stuart. "Thieno-extended purines and related ring systems." Thesis, University of Salford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261839.

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19

Rodger, Robert. "Fused ring systems in natural product synthesis." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/27645.

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On the instigation of A/Prof C. S. P. McErlean I investigated the rapid synthesis of fused ring compounds by a key polyene cyclisation. Chapter 1 sets the scene by highlighting deficiencies in literature syntheses of selected fused-ring compounds, where synthetic strategies are often suboptimal. In particular, the scarcity of reported syntheses involving a direct cyclisation method is noted. Chapter 2 discusses the taiwaniaquinoids and previous synthetic approaches including McErlean group efforts which delivered the non-natural stereochemistry. A method to produce the desired trans stereo

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20

Jones, S. W. "A photochemical approach to the thromboxane A ring system." Thesis, University of Salford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376860.

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21

Fan, Chenjun. "Fiber optic sensor based on dual ring resonator system /." Online version of thesis, 1992. http://hdl.handle.net/1850/11070.

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22

Marley, Mark Scott. "Nonradial oscillations of Saturn: Implications for ring system structure." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184978.

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Numerous wave and gap features observed in Voyager data of Saturn's rings are produced by resonances between the orbital frequencies of known external satellites and ring particle orbits. This thesis investigates the possibility that other, currently unassociated, ring features are generated by perturbations on ring participle orbits produced by non-axisymmetric gravitational fields resulting from acoustic oscillation modes of the planet. The frequencies of Saturnian low degree (l ≤ 8) fundamental (or f) mode oscillations are calculated for a variety of Saturn interior models which span the ra

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23

Roushanbakhti, Ahria Esphandiar. "Synthesis of the EFG-ring system of pectenotoxin-4." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:60edd2d0-e13f-4dc4-b45d-eb151e44878e.

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The EFG-ring system of pectenotoxin-4 was synthesised via a novel pathway which ultilised a cobalt-mediated oxidative cyclisation to access the trans F-ring, and an osmium-mediated oxidative cyclisation to form the cis E-ring. Subsequent union of these fragments, under modified Julia-Kocienski olefination conditions, facilitated the synthesis of the EFG-ring system of pectenotoxin-4. <b>Introduction</b> This chapter reports the previous total syntheses of pectenotoxin molecules, along with completed syntheses of pectenotoxin fragments, including the Donohoe group's synthesis of the ABC-ring sy

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24

VanWiggeren, Gregory D. "Chaotic communication with erbium-doped fiber ring lasers." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/30299.

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25

Xu, Guoda, John M. Bartha, Stuart McNamee, Larry Rheaume, and Allen Khosrowabadi. "OPTICAL SLIP-RING CONNECTOR." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607336.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Current ground-based tracking systems at the DoD test and training ranges require transmission of a variety of signals from rotating platform to fixed control and process center. Implementation of commercial off the shelf (COTS) solution for transmitting high-speed, multiple-channel data signals over a rotational platform prompt the development of an advanced electro-optic hybrid rotating-to-fixed information transmission technology. Based on current demand,

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26

Dincoflaz, Yasemin. "The Synthesis Of 6- And 7- Membered Heterocyclic Ring Systems Fused To Pyridine Ring." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615579/index.pdf.

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The synthesis of the nitrogen containing heterocyclic compounds is one of the leading research areas throughout the organic chemistry due to their significant activities in biological systems. Among the various biologically active molecules, pyridine-fused ring systems are of prime importance on the grounds of their proven clinical roles. The coupling reactions with 6-membered heterocyclic compounds and diazepines gave rise to new pharmalogical compounds in recent years. Therefore, our object was the synthesis of pyridine-fused 6- and 7-membered heterocycles. Starting from bromopyridine, two d

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27

Marino, S., L. Matrà, C. Stark, et al. "Exocometary gas in the HD 181327 debris ring." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621723.

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An increasing number of observations have shown that gaseous debris discs are not an exception. However, until now, we only knew of cases around A stars. Here we present the first detection of (CO)-C-12 (2-1) disc emission around an F star, HD 181327, obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) observations at 1.3 mm. The continuum and CO emission are resolved into an axisymmetric disc with ring-like morphology. Using a Markov chain Monte Carlo method coupled with radiative transfer calculations, we study the dust and CO mass distribution. We find the dust is distribu

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28

Bowden, M. C. "Synthesis with citreoviridinoids." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379011.

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29

Hill, David Ronald. "The cycloadditions of 2-(N-Acylamino)-1-thia-1,3-dienes." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277566.

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30

Williams, David Alan John. "Radical approaches toward polycyclic alkaloids." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323499.

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31

Woodward, Gary. "Synthetic, chemical and structural studies of some new linear, cyclic and bicyclic phosphazane oxides." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352909.

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32

Bean, David Edward. "Aromaticity in molecular systems with multiple ring currents." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531195.

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33

O'Sullivan, Paul Thomas. "Natural product systems from eight-membered ring lactones." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621632.

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34

McMillan, Fiona M. "New pyrolytic routes to ortho-condensed ring systems." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/11148.

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A variety of methyl biphenyl-2-acrylate precursors, substituted in the 2’-, 3’- or 4’-positions, were synthesised using a Suzuki coupling reaction between 2-formylphenylboronic acid and the appropriate aryl halide, followed by Wittig olefination. These precursors were then pyrolysed to produce 3-cyano, 3-methyl and 3-chloro substituted phenanthrenes. The synthesis of 1-cyanophenanthrene was also successful. This route was also successful in producing naphthothiophenes and naphthofurans from appropriate heteroaryl-substituted precursors. This methodology was expanded into the synthesis of sever

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35

Oakley, D. Bruce (Douglas Bruce) Carleton University Dissertation Engineering Electrical. "Image filtering on slotted ring multiple DSP systems." Ottawa, 1992.

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36

Xu, Tianyuan. "On the Subregular J-ring of Coxeter Systems." Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22741.

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Let (W, S) be an arbitrary Coxeter system, and let J be the asymptotic Hecke algebra associated to (W, S) via Kazhdan-Lusztig polynomials by Lusztig. We study a subalgebra J_C of J corresponding to the subregular cell C of W . We prove a factorization theorem that allows us to compute products in J_C without inputs from Kazhdan-Lusztig theory, then discuss two applications of this result. First, we describe J_C in terms of the Coxeter diagram of (W, S) in the case (W, S) is simply- laced, and deduce more connections between the diagram and J_C in some other cases. Second, we prove that

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37

Veppathur, Sivaramakrishnan Srikanth. "Discrete Tire Modeling for Anti-lock Braking System Simulations." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51424.

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Tires play an extremely important role in the operation of a vehicle as they transmit forces between the ground and the vehicle. Consistent efforts have been made over the years towards modeling and simulation of tires and more recently, there has been an increasing need to understand the transient response of tires to various high-frequency events such as anti-lock braking and short-wavelength disturbances from the road. Major thrust has been provided by the tire industry to develop simulation models that accurately predict the dynamic response of tires without the use of computationally inte

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38

Batchelor, John. "Annular ring microstrip patch antennas for mobile communications." Thesis, University of Kent, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282579.

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39

Gamble, David Lewis. "Studies towards peptide synthesis in aqueous phase." Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296229.

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40

Thompson, David Francis. "Iron (III) mediated ring expansion / cyclisation reactions." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297007.

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41

Baille, Kevin. "Fine-scale structures in Saturn's rings waves, wakes and ghosts." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4840.

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The Cassini mission provided wonderful tools to explore Saturn, its satellites and its rings system. The UVIS instrument allowed stellar occultation observations of structures in the rings with the best resolution available (around 10 meters depending on geometry and navigation), bringing our understanding of the physics of the rings to the next level. In particular, we have been able to observe, dissect, model and test the interactions between the satellites and the rings. We first looked at kilometer-wide structures generated by resonances with satellites orbiting outside the main rings. The

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42

Anderlucci, Maria. "A geometric approach to systems over rings with applications to linear systems with delays." Doctoral thesis, Università Politecnica delle Marche, 2006. http://hdl.handle.net/11566/242524.

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43

Levanič, Tom. "Atrics- A New System For Image Acquisition In Dendrochronology." Tree-Ring Society, 2007. http://hdl.handle.net/10150/622554.

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We developed a new system for image acquisition in dendrochronology called ATRICS. The new system was compared with existing measurement methods. Images derived from the ATRICS program and processed in any of the available programs for automatic tree-ring recognition are of much higher detail than those from flatbed scanners, as optical magnification has many advantages over digital magnification (especially in areas with extremely narrow tree rings). The quality of stitching was tested using visual assessment - no blurred areas were detected between adjacent images and no tree rings were miss

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44

Hassan, Muhammad. "Production 4.0 of Ring Mill 4 Ovako AB." Thesis, Högskolan i Gävle, Elektronik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-33405.

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Cyber-Physical System (CPS) or Digital-Twin approach are becoming popular in industry 4.0 revolution. CPS not only allow to view the online status of equipment, but also allow to predict the health of tool. Based on the real time sensor data, it aims to detect anomalies in the industrial operation and prefigure future failure, which lead it towards smart maintenance. CPS can contribute to sustainable environment as well as sustainable production, due to its real-time analysis on production. In this thesis, we analyzed the behavior of a tool of Ringvalsverk 4, at Ovako with its twin model (know

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45

Pendleton, Nevil. "A synthetic approach to the C/D ring system of steroids." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26512.

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This thesis is concerned with an approach to the synthesis of the C/D ring system and side chain of steroids with 11-oxygen functionality. (+)-9,10-Dibromocamphor (18) [prepared in three steps from (+)-endo-3-bromocamphor (4)] was converted to the diester 144 in six steps. The diester 144 underwent a modified acyloin reaction to provide the silylated enediolate 154. A novel methanolysis of the acyloin intermediate 154 gave a 1:1 mixture of the isomeric tricyclic methoxy-ketones 168 and 176. Oxidative cleavage of these methoxyketones 168 [Formula Omitted] and 176 provided the isomeric ald

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46

Chaudhari, Amita. "Toward the asymmetric synthesis of the AB-ring system of phorbol." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0021/MQ53359.pdf.

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47

Oh, Young-im. "Approaches to the synthesis of the oxa-bridged germacrane ring system." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/27566.

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48

Grist, Matthew. "Synthesis of a DEF ring system of hexacyclinic acid and FR182877." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405385.

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49

Nandu, Mahendra P. "Thermotropic liquid crystalline copolyesters containing the bicycl0[2.2.2]0ctane ring system." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1987. http://digitalcommons.auctr.edu/dissertations/3744.

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The syntheses of polyesters and copolyesters containing the bicyclo[2.2.2]octane ring and spacers such as sebacoyl chloride, ethyleneglycol, 1,4-butanediol, and 1,8-octanediol are discussed. The following homopolyesters were synthesized: poly(oxy-trans-1.4- cyclohexyleneoxycarbonyl-1,4-bicyclo[2.2.2]octylenecarbonyl) I; poly[(oxy-2-bromo-l,4-phenylene)oxycarbonyl-l,4-bicyclo[2.2.2]octy-lenecarbonyl] III; and poly[oxy(2-phenyl-1,4-pheny1ene)oxycarbonyl-1.4- bicyclo[2.2.2]octylenecarbonyl] V. The following copolyesters were synthesized: poly(oxy-trans-1,4-cycl ohexyleneoxycarbonyl-l,4-bicyclo[2.

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50

Hill, K. E. "The utility of ring springs in seismic isolation systems." Thesis, University of Canterbury. Mechanical Engineering, 1995. http://hdl.handle.net/10092/7923.

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Ring springs are frictional devices consisting of inner and outer ring elements assembled to form a spring stack. External load applied to the spring produces sliding action across mating ring interfaces. Large amounts of energy, as much as 60-70% of the total cycle energy, may be absorbed in overcoming frictional forces. This thesis details the characteristics and dynamic behaviour of ring spring systems and describes the design and testing of a seismic isolation system that uses ring springs. Initially the characteristics and fundamental dynamic behaviour of single-degree-of-freedom mass/r

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