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Dissertations / Theses on the topic 'Phase'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Diat, Olivier. "Effet du cisaillement sur des phases lyotropes : phase lamellaire et phase éponge." Bordeaux 1, 1992. http://www.theses.fr/1992BOR10611.

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Les phases de membranes ont ete depuis longtemps l'objet de nombreuses etudes, quant a leurs proprietes statiques. Dans cette these, nous etudions leur dynamique et plus specifiquement, l'effet d'un cisaillement. Par differentes techniques de mesure (conoscopie, diffusion de lumiere, de neutrons ou de rayons x, microscopie, rheologie), nous presentons, et analysons les differents etats d'orientation d'une phase lamellaire lyotrope dans un systeme quaternaire eau-dodecane-sds-pentanol; un etat de vesicules multi-lamellaires de taille controlee par le cisaillement existe quel que soit le systeme

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2

Butler, Jonny. "Phase structure, phrase structure, and quantification." Thesis, University of York, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415175.

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3

Auguste, Frédéric. "Flexibilité et structure de deux phases lyotropes : phase lamellaire et phase de vésicules." Bordeaux 1, 1993. http://www.theses.fr/1993BOR10587.

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4

Sang, Yan. "Phases and Phase Transitions in Quantum Ferromagnets." Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/18716.

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In this dissertation we study the phases and phase transition properties of quantum ferromagnets and related magnetic materials. We first investigate the effects of an external magnetic field on the Goldstone mode of a helical magnet, such as MnSi. The field introduces a qualitatively new term into the dispersion relation of the Goldstone mode, which in turn changes the temperature dependences of the contributions of the Goldstone mode to thermodynamic and transport properties. We then study how the phase transition properties of quantum ferromagnets evolve with increasing quenched disorder

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5

Ran, Ying. "Spin liquids, exotic phases and phase transitions." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/45404.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2007.<br>Includes bibliographical references (p. 135-139).<br>Spin liquid, or featureless Mott-Insulator, is a theoretical state of matter firstly motivated from study on High-Tc superconductor. The most striking property of spin liquids is that they do not break any physical symmetry, yet there are many types of them, meaning a phase transition is necessary from one spin liquid to another. It was a long debate about whether these exotic states can serve as the ground states in real materials or even models. In this thes

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6

Xu, Jian. "X-Band Phase Shifters for Phased Array." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196888776.

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7

Zetterling, Fredrik. "Phase Transformations in Computer Simulated Icosahedrally Ordered Phases." Doctoral thesis, KTH, Numerical Analysis and Computer Science, NADA, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3570.

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<p>Computer simulations play a profound and fundamental role inmodern theoretical physics, chemistry and materials science. Tounderstand the complex physics of metally liquids, metals,quasicrystals and metally glasses a working model imposing thelocal and global order is needed. Experiments and theory havepredicted the local order in liquid metals to beicosahedral.</p><p>The current work has been done using molecular dynamicscomputer simulations of a monatomic system using a simplepair-potential for the interactions. Two new pair-potentialshas been developed, the Zetterling-1(Z1) and Zetterlin

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8

Knott, Michael. "Phases and phase transitions in charged colloidal suspensions." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270941.

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9

Zhao, Qing. "Pseudostationary Phase for Solid Phase Extraction." TopSCHOLAR®, 2006. http://digitalcommons.wku.edu/theses/988.

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A unique pseudostationary phase for Solid Phase Extraction is presented. This pseudostationary phase consists of surfactant, which is initially immobilized onto hydrophilic cation exchange resin. The surfactant chain through hydrophobic interactions extracts hydrophobic analytes in the same manner as conventional bonded alkyl moieties on silica based non-polar sorbents. Although hydrophobic analytes can be efficiently trapped on commercially available non-polar sorbents (i.e. Ci8 silica), organic solvents that are necessary to break strong hydrophobic interactions between the analytes and the

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10

Ghaemi, Mohammadi Pouyan. "Phases and phase transitions of strongly correlated electron systems." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45456.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.<br>Includes bibliographical references (leaves 169-174).<br>Different experiments on strongly correlated materials have shown phenomena which are not consistent with our conventional understandings. We still do not have a general framework to explain these properties. Developing such a general framework is much beyond the scope of this thesis, but here we try to address some of challenges in simpler models that are more tractable. In correlated metals it appears as strong correlations have different effect on diffe

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11

Sanyal, Alarka. "CMOS Phase Shifter for Conformal Phased Array Beamformer Applications." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27697.

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A vector modulator based phase shifter is developed using 0.18um CMOS process at S-band frequency to be integrated into a conformal phased array antenna to recover the desired radiation pattern in the entire 360? range. The phase shifter has a variable gain amplifier integrated into the circuit in order to vary gain along with phase for precise control to correct the degraded radiation pattern due to the conformal shaping. The results show state-of-the-art performances including more than 7dB conversion gain with variable feature, a continuous phase rotation of 360? with steps as low as 11.25?

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12

Magozore, Caxton. "DSP phase angle controlled three phase to single phase uninterruptible power supply." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5177.

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13

Kunda, Wilkinson. "Two phase problems and two phase flow." Thesis, University of Hull, 1986. http://hydra.hull.ac.uk/resources/hull:5902.

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In section 1 of this thesis a two-dimensional mathematical model is used to investigate the circulation in a gas-bubble agitation system of a cylindrical vessel for the case of an orifice located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region and is investigated using Wallis' Drift Flux Model. In the single-phase (liquid) region the turbulent Navier-Stokes equations, written in terms of the stream function, are used for the mathematical model. The analysis in the two-phase region yields the boundary conditions on the two-phase/sin

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14

Gurunlu, Cemil. "Single-phase operations of three-phase generators." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/32922.

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The ever-increasing demand for power, and the correspondingly greater complexity of power systems, is leading to more severe problems of system reliability. Modern society is so dependent on the usage of electrical power that even a short interruption of service can cause serious problems. A public utility cannot be expected to provide a perfect power supply, since many of the possible causes of a power disturbance are beyond its control. The windings of small diesel-driven three-phase generator sets are often capable of being connected in either a zig-zag or an Edison-delta arrangement, to pr

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15

Li, Yichen. "Phase-field Modeling of Phase Change Phenomena." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99148.

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The phase-field method has become a popular numerical tool for moving boundary problems in recent years. In this method, the interface is intrinsically diffuse and stores a mixing energy that is equivalent to surface tension. The major advantage of this method is its energy formulation which makes it easy to incorporate different physics. Meanwhile, the energy decay property can be used to guide the design of energy stable numerical schemes. In this dissertation, we investigate the application of the Allen-Cahn model, a member of the phase-field family, in the simulation of phase change prob

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16

Lei, Siu Long. "Phase-field simulations of two-phase flows /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MATH%202009%20LEI.

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17

Kim, Sunghwan. "Phase shifter approaches for compact low-power phased array transmitters." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3398530.

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Thesis (Ph. D.)--University of California, San Diego, 2010.<br>Title from first page of PDF file (viewed May 5, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 103-109).

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18

Tweedlie-Yuill, Tracey. "Characterisation of cyanopropyl stationary phases for reserved phase liquid chromatography." Thesis, University of Strathclyde, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488857.

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The current study has demonstrated that CN phases have poor stability and should not be operated above pH 5.7. Nonetheless, a number of protocols have been developed for the characterization of CN phases that include a measurement of silanophilic interaction determined in mobile phases with pH > 5.7. The aim of this study was to perform the chromatographic characterization of commercially available CN phases using two distinct approaches.

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19

Waichigo, Martin M. "Alkylammonium Carboxylates as Mobile Phases for Reversed-Phase Liquid Chromatography." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1134142423.

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20

Loginova, Irina. "Phase-field modeling of diffusion controlled phase transformations." Doctoral thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3626.

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<p>Diffusion controlled phase transformations are studied bymeans of the phase-field method. Morphological evolution ofdendrites, grains and Widmanst\"atten plates is modeled andsimulated.</p><p>Growth of dendrites into highly supersaturated liquids ismodeled for binary alloy solidification. Phase-field equationsthat involve both temperature and solute redistribution areformulated. It is demonstrated that while at low undercoolingheat diffusion does not affect the growth of dendrites, i.e.solidification is nearly isothermal, at high cooling rates thesupersaturation is replaced by the thermal u

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21

Whitaker, T. S. "Measurement of two-phase flows by phase separation." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240831.

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22

Ai, Chiayu. "Phase measurement accuracy limitation in phase shifting interferometry." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184252.

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In phase shift interferometry (PSI), several factors affect measurement accuracy, such as piezoelectric transducer (PZT) calibration (i.e. PZT slope error) and PZT nonlinearity, vibration, spurious reflection, source bandwidth, detector nonlinearity, and detector noise. The effects of these error sources on several algorithms to solve the phase of the wavefront are studied. When the simple arctangent formula is used, if the PZT slope is properly adjusted, the error due to the PZT quadratic nonlinearity can be tremendously reduced. An exact solution is derived to remove the error when the PZT q

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23

Bitteur, Sylvaine. "Etude, par chromatographie en phase liquide, du partage de composes d'arôme entre une phase aqueuse et des phases stationnaires hydrophobes." Paris 6, 1986. http://www.theses.fr/1986PA066449.

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Ce travail a consisté à étudier dans quelle mesure la chromatographie en phase liquide permet d'extraire les composes d'arôme présents en très faible concentration dans les effluents aqueux des industries agro-alimentaires. Les rendements d'extraction accessibles par enrichissement de traces étant directement lies aux facteurs de capacité des solutés d'intérêt, l'étude proposée se ramenait à celle du partage de composes d'arôme entre une phase aqueuse et des phases stationnaires hydrophobes. La première partie détaille les divers paramètres susceptibles de modifier les rendements d'extraction

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24

Bitteur, Sylvaine. "Etude par chromatographie en phase liquide, du partage de composés d'arome entre une phase aqueuse et des phases stationnaires hydrophobes." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375960653.

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25

Pollock, Asher W. "Phase Shift." Ohio University Honors Tutorial College / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1492781853322151.

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26

Debray, Jean-Christophe. "Elaboration de phases stationnaires originales pour la chromatographie en phase gazeuse." Rouen, 2014. http://www.theses.fr/2014ROUES048.

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27

Scobie, Hugh Alistair. "Dietary hydroxycinnamic acids, phase I and Phase II metabolism." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ54178.pdf.

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28

Xu, Hui. "Phase structure and phase transitions in semicrystalline isotactic polystyrene /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2005.

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Thesis (Ph.D.)--Tufts University, 2005.<br>Adviser: Peggy Cebe. Submitted to the Dept. of Physics. Includes bibliographical references. Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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29

McBride, Roy. "Phase measurement and phase control in fibre-optic interferometers." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1219.

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30

Simpkin, Neil John. "Solution behaviour and phase-phase diffusion of microbial lipases." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387207.

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31

Uzunoglu, Vasil, and Ann B. Maiorano. "PHASE CORRECTION AND PHASE CANCELLING NETWORKS IN QPSK MODEMS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615732.

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International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, Nevada<br>At bit rates lower than 100Mbit/s, the Synchronous Oscillator (SO) [1-4] has substantial tracking band combined with steep skirt selectivity to satisfy all the requirements of a carrier recovery network without the need for a phase correction network. At higher bit rates however, there is a need for a phase correction or phase cancelling network, if the BER variations with respect to hard wired case must be confined to less than 0.2dB with IF offsets of ±30kHz. At bit rates higher than

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32

Powanwe, Arthur Sadrack. "Brain Rhythm Fluctuations: Envelope-Phase Modeling and Phase Synchronization." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42116.

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Fast neural oscillations known as beta (12-30Hz) and gamma (30-100Hz) rhythms are recorded across several brain areas of various species. They have been linked to diverse functions like perception, attention, cognition, or interareal brain communication. The majority of the tasks performed by the brain involves communication between brain areas. To efficiently perform communication, mathematical models of brain activity require representing neural oscillations as sustained and coherent rhythms. However, some recordings show that fast oscillations are not sustained or coherent. Rather they ar

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33

Agrawal, Vaibhav. "Multiscale Phase-field Model for Phase Transformation and Fracture." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/850.

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We address two problems in this thesis. First, a phase-field model for structural phase transformations in solids and second, a model for dynamic fracture. The existing approaches for both phase transformations and fracture can be grouped into two categories. Sharp-interface models, where interfaces are singular surfaces; and regularized-interface models, such as phase-field models, where interfaces are smeared out. The former are challenging for numerical solutions because the interfaces or crack needs to be explicitly tracked, but have the advantage that the kinetics of existing interfaces o

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34

Beck, Markus. "Boron in Palladium: interaction, phase formation and phase transformation." [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9556602.

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35

Kokel, Samuel John. "Retrodirective phase-lock loop controlled phased array antenna for a solar power satellite system." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3047.

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This thesis proposes a novel technique using a phase-lock loop (PLL) style phase control loop to achieve retrodirective phased array antenna steering. This novel approach introduces the concept of phase scaling and frequency translation. It releases the retrodirective transmit-receive frequency ratio from integer constraints and avoids steering approximation errors. The concept was developed to achieve automatic and precise beam steering for the solar power satellite (SPS). The testing was performed using a transceiver converting a pair of received 2.9 GHz signals down to 10 MHz, and up con

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36

Apte, Pankaj A. "Phase equilibria and nucleation in condensed phases a statistical mechanical study /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1135876018.

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37

Baumann, Wolfgang [Verfasser]. "Phase-transformation kinetics of TiCr2 laves phases / vorgelegt von Wolfgang Baumann." Stuttgart : Max-Planck-Inst. für Metallforschung, 2010. http://d-nb.info/1007316489/34.

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38

Charles, Cameron T. "A calibrated phase and amplitude control system for phased-array transmitters /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5911.

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39

Khong, Teck Meng. "Heterogeneous gas phase reactions for the production of chemically bonded phases." Thesis, Birkbeck (University of London), 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246077.

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40

Grover, Tarun Ph D. Massachusetts Institute of Technology. "Applied fractionalization : quantum phases and phase transitions of strongly interacting systems." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/68973.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 131-136).<br>Strongly correlated systems present interesting challenges in condensed matter physics. On the one hand, the theoretical work in the last two decades suggests that strong interactions may lead to new phases and phase transitions of matter that don't fit paradigms such as Fermi liquid theory or Landau's theory of phase transitions. On the other hand, there are actual materials which are undoubtedly governed by strong int

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41

Lienne, Michelle. "Separation d'enantiomeres par chromatographie en phase liquide sur phases stationnaires chirales." Paris 6, 1989. http://www.theses.fr/1989PA066318.

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La separation directe d'enantiomeres par chromatographie en phase liquide sur phases stationnaires chirales (psc) repose sur la difference de stabilite des complexes diastereoisomeres formes transitoirement entre les enantiomeres du solute et les entites chirales de la psc. La premiere partie de ce memoire est consacree a l'etude de psc de type pirkle synthetisees a partir d'oxydes de phosphines chiraux ou de derives n-dinitro-3,5-benzoyle (dnb) d'acides amines. Des mecanismes bimoleculaires de reconnaissance chirale sont discutes et les parametres qui les affectent sont evalues. La seconde pa

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42

Huang, Tsang-Min. "Phase Equilibria of Binary Liquid Crystal Mixtures Involving Induced Ordered Phases." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1284381816.

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43

Apte, Pankaj A. "Phase equilibria and nucleation in condensed phases: a statistical mechanical study." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135876018.

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44

Torrellas-Hidalgo, Luzmila. "EFFECTS OF ETHANOL/WATER MOBILE PHASES ON REVERSED-PHASE LIQUID CHROMATOGRAPHY." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275466.

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45

Ye, Bing. "Unconventional Quantum Phases in Strongly Correlated Systems." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:106990.

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Thesis advisor: Ying Ran<br>In this thesis, I investigated and implemented various numerical and simulation methods, including mean field theory, functional renormalization group method (fRG), density matrix renormalization group (DMRG) method etc., to find different quantum phases and quantum phase diagrams on models of correlated electronic systems. I found different phase diagrams with phases such as magnetism, superconductivity. By summarizing the strength and limitations of these methods, I investigated the projected entangled paired states (PEPS) with symmetry quantum number to sharply d

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46

Azevedo, Cesar R. de Farias. "Phase diagram and phase transformations in Ti-Al-Si system." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/1278.

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47

Wang, Junjia. "Phase information and phase modulated signals in fibre optical communications." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107763.

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In future telecommunication networks, a wide range of pulse durations 0.1–100 ps, duty cycles from less than 1% to 99%, and different modulation formats, such as on-off-keying (OOK) and binary or differential phase-shift-keying (BPSK or DPSK) will be selected, depending on the network size and the bit rate. A transparent all-optical format conversion between OOK and DPSK is highly demanded to connect cost effective OOK based metropolitan area networks (MAN) to robust PSK-based long‐haul backbone networks. Moreover, for such complex optical transmission systems, the information on the phase and

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48

Davis, Kyle. "Radio frequency photonic in-phase and quadrature-phase vector modulation." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50354.

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The focus of this thesis is to investigate the implementation of Radio Frequency (RF) In-Phase and Quadrature-Phase (I/Q) vector modulation through the use of modern photonic components and sub-systems which offer extremely wide RF intrinsic bandwidths. All-electronic vector modulators suffer from frequency coverage limitations and amplitude and phase instability due to components such as phase shifters and variable gain controllers operating at or near 100\% bandwidth. In stark contrast, once an RF signal has been modulated onto an optical carrier, the percent bandwidth of the RF to carrier

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49

Thein, Ferdinand [Verfasser]. "Results for two phase flows with phase transition / Ferdinand Thein." Magdeburg : Universitätsbibliothek, 2018. http://d-nb.info/1165650487/34.

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50

Garber, Edward Martin. "Surface acoustic wave single-phase unidirectional transducers and phase weighting." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15225.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Bibliography: leaves 245-253.<br>by Edward Martin Garber.<br>Ph.D.

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