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Dissertations / Theses on the topic 'Phase object'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

To, Thang Long Information Technology &amp Electrical Engineering Australian Defence Force Academy UNSW. "Video object segmentation using phase-base detection of moving object boundaries." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Information Technology and Electrical Engineering, 2005. http://handle.unsw.edu.au/1959.4/38705.

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A video sequence often contains a number of objects. For each object, the motion of its projection on the video frames is affected by its movement in 3-D space, as well as the movement of the camera. Video object segmentation refers to the task of delineating and distinguishing different objects that exist in a series of video frames. Segmentation of moving objects from a two-dimensional video is difficult due to the lack of depth information at the boundaries between different objects. As the motion incoherency of a region is intrinsically linked to the presence of such boundaries and vice v

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2

Anderson, R. "Phase-based object matching using complex wavelets." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595514.

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This thesis investigates the use of phase information from the Dual-Tree Complex Wavelet Transform (DT CWT) for the purpose of image matching. We review methods for image matching with a particular emphasis on matching with local features. We review the meaning and current uses of local phase, and introduce the DT CWT. We highlight the shortcomings of decimated wavelets for typical local phase analysis, and introduce two new functions that can extract useful information from the phases of decimated complex wavelets. The first, the InterLevel Product (ILP), is a pyramidal representation where t

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Gardner, Mark Charles. "Phase object pattern recognition by optical correlation using a liquid crystal display for spatial phase modulation." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409700.

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Chin, F. Y. H. "New coherent optical processor using phase stepping interferometry to improve object discrimination." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358316.

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5

Liu, Chen. "Relationship of object surface geometry on Fourier-transformed phase and amplitude images in infrared thermography." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23720/23720.pdf.

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6

Liljeby, Jonas. "An evaluation of grid based broad phase collision detection for real time interactive environments." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-9591.

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Detailed and exact collision detection for large amounts of objects has for a long time been a non real-time affair because of the immense amount of computations necessary. This was however not only because of the complexity of the algorithms but also because discussed of the computations would not have had to be done in the first place. This paper has through literature research and empirical testing examined two different broad phase approaches to object culling in a three dimensional environment. The aim of such a broad phase algorithm is to decrease the amount of computation heavy narrow p

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Robisch, Anna-Lena [Verfasser], Tim [Akademischer Betreuer] Salditt, and Russell [Akademischer Betreuer] Luke. "Phase retrieval for object and probe in the optical near-field / Anna-Lena Robisch. Betreuer: Tim Salditt. Gutachter: Tim Salditt ; Russell Luke." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1081246871/34.

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Gudiškis, Andrius. "Objektų vaizde sekimo technologijų tyrimas vaizdo transliavimo sistemoms." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140616_164448-12072.

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Šiame darbe buvo ištirtas keleto pasirinktų objekto vaizde sekimo metodų pritaikomumas relaus laiko vaizdo transliavimo sistemose. Išsiaiškinta, kad standartinis blokelių sutapdinimo algoritmas, nors yra pats paprasčiausias iš tirtųjų, yra netinkamas naudoti tokiose sistemose dėl ilgai užtrunkančių skaičiavimų, kurie sukuria papildomą vaizdo vėlinimą. Fazinės koreliacijos metodo taikymo taip pat buvo atsisakyta, nes jo randami vaizdo poslinkio vektoriai yra pernelyg atsitiktiniai. Tiriant būdingųjų taškų paieška ir sutapdinimu grįstus algoritmus buvo išsiaiškinta, kad HARRIS randa daugiausiai

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Hu, Xiaoshi. "Les constructions causatives du français et du chinois." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC056/document.

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Cette thèse est centrée autour des problèmes concernant les constructions causatives du français et du chinois, elle se veut une contribution empirique et théorique à l’étude formelle des systèmes verbaux du français et du chinois. Il sera montré que la défectivité en traits des têtes de phases joue un rôle important motivant la formation des constructions au sein de ces deux langues. Concernant la construction causative en faire du francais, nous allons utiliser l’interprétation de respectivement comme test pour justifier son statut bi-propositionnel? et l’examen des relations quantificationn

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Málková, Eliška. "Monitorování pohybu více objektů užitím křížové korelace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400456.

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Tato práce popisuje metodu analýzy translačního pohybu užitím křížové korelace. Ukazujeme, jakým způsobem se chová funkce křížové korelace obrazů s navzájem posunutými objekty, a jak nám to umožňuje nacházet jejich vektory posunu. Pro následnou implementaci je nalezena efektivní metoda pro hledání pouze požadovaného počtu lokálních maxim funkce.

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Mouri, Abdelkader. "Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT207.

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Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse et un gel colloïdal, à base de Pécéol®, lécithine, éthanol et eau. Le lithium indiqué dans le traitement de maladies neurodégénératives a été utilisé comme un modèle de principe actif hydrophile dans le cadre de ce projet. Ce travail a été initié par l’étude du comportement de phases du mélange quaternaire Pécéol®/lécithine/éthanol/eau, mettant essentiellement l’accent sur les différents paramètres impliqués dans les transition

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Mouri, Abdelkader. "Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse." Electronic Thesis or Diss., Montpellier, 2016. http://www.theses.fr/2016MONTT207.

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Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse et un gel colloïdal, à base de Pécéol®, lécithine, éthanol et eau. Le lithium indiqué dans le traitement de maladies neurodégénératives a été utilisé comme un modèle de principe actif hydrophile dans le cadre de ce projet. Ce travail a été initié par l’étude du comportement de phases du mélange quaternaire Pécéol®/lécithine/éthanol/eau, mettant essentiellement l’accent sur les différents paramètres impliqués dans les transition

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13

Goldstein, Goldie L. "Smart Temporal Phase Unwrapping for Biological Objects." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311573.

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The development of a quantitative phase microscope (QPM) has allowed the ability to acquire real-time phase movies of biological processes. The image processing of the data is critical to the system's ability to measure relative changes. The phase data must be consistent throughout a measurement and background fluctuations must be minimized. The research presented in this work discusses methods to effectively process sequences of phase data such that it can be used to quantify changes within real-time studies of living cells. This work begins by exploring two-dimensional phase unwrapping to

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Schadeberg, Thilo C. "Uo mmoja hautiwi panga mbili: aina za yambwa na maana zake." Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-98108.

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`Kinds of objects and their meanings´ deals with objecthood in Kiswahili. From a syntactic point of view, there is but one kind of object: the distinction between `direct´ and `indirect´ object has no syntactic properties, and one verb can have only one object. Of course, objects can have different semantic roles. This raises questions about the syntactic and semantic functions of `naked´ non-objects, and some of these are approached by inspecting fifty examples of the verb kutia `to put [sth] [into]´ from Sacleux´s dictionary. Three syntactic and semantic frames are distinguished and the resp

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Talebi, Reza. "THREE DIMENSIONAL RECONSTRUCTION OF OBJECTS BASED ON DIGITAL FRINGE PROJECTION." Thesis, Laurentian University of Sudbury, 2013. https://zone.biblio.laurentian.ca/dspace/handle/10219/2104.

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Three-dimensional reconstruction of small objects has been one of the most challenging problems over the last decade. Computer graphics researchers and photography professionals have been working on improving 3D reconstruction algorithms to fit the high demands of various real life applications. In this thesis, we implemented a 3D scanner system based on fringe projection method. Two different methods have been implemented and used as the unwrapping solution in fringe projection method. A parameterization tool has been created in order to generate different fringe patterns for distinctive need

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Gerbershagen, Alexander. "CLIC drive beam phase stabilisation." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:ef939ced-40d0-47b6-bcd2-2fac32d0d318.

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The thesis presents phase stability studies for the Compact Linear Collider (CLIC) and focuses in particular on CLIC Drive Beam longitudinal phase stabilisation. This topic constitutes one of the main feasibility challenges for CLIC construction and is an essential component of the current CLIC stabilisation campaign. The studies are divided into two large interrelated sections: the simulation studies for the CLIC Drive Beam stability, and measurements, data analysis and simulations of the CLIC Test Facility (CTF3) Drive Beam phase errors. A dedicated software tool has been developed for a ste

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Memarzadeh, Sarvenaz. "Noninterferometric tomographic reconstruction of 3D static and dynamic amplitude and phase objects." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1405525073.

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Hudeček, Gabriel. "Ocenění stavby v realizační a provozní fázi životního cyklu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225635.

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This thesis treats about evaluation of construction in the operating phase and in the implementing phase of the life cycle, too. The thesis is e.g. about theoretical and practical budgeting of building object, real estate evaluation and implementing costs of concrete object. The main aim of this thesis is compilation of price concrete object with the help of budget and valuation by methods for real estate evaluation. In this thesis is done the valuation of object in the actual price level and in the price level of 1976. The price and the material development is illustrated between these ages,

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19

Dunningham, Jacob Andrew. "Quantum phase of Bose-Einstein condensates." Thesis, University of Oxford, 2001. http://ora.ox.ac.uk/objects/uuid:b6cc8b74-753c-4b3e-ad5e-68bd7e32b652.

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The quantum phase of a Bose-Einstein condensate has long been a subject fraught with misunderstanding and confusion. In this thesis we provide a consis- tent description of this phenomenon and, in particular, discuss how phase may be defined, created, manipulated, and controlled. We begin by describing how it is possible to set up a reference condensate against which the phase of other condensates can be compared. This allows us to think of relative phases as if they were absolute and gives a clear and precise definition to 'the phase of a condensate'. A relative phase may also be established

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20

Fuller, Paul A. "Improving lessons learnt outcomes in multi-phase project environments." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8161.

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The capture and beneficial application of learning from past experiences in projects has been an area of interest and debate for many years. The implementation of lessons learnt is commonly acknowledged as difficult. Existing studies point to the deficiencies in current practice but few propose practical approaches to improve the situation. A key barrier to learning in projects is the time-critical nature of most projects which makes the creation of time and space to learn and then apply the resultant learning problematic. Other inhibitors include the variety and temporality of project teams,

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21

Miracle, Sarah. "The effects of bias on sampling algorithms and combinatorial objects." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53526.

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Markov chains are algorithms that can provide critical information from exponentially large sets efficiently through random sampling. These algorithms are ubiquitous across numerous scientific and engineering disciplines, including statistical physics, biology and operations research. In this thesis we solve sampling problems at the interface of theoretical computer science with applied computer science, discrete mathematics, statistical physics, chemistry and economics. A common theme throughout each of these problems is the use of bias. The first problem we study is biased permutations

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Robinson, Thomas A. "Quasi-phase-matching of high-harmonic generation." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:dd3b4ad3-5e57-40fc-94b0-98bb32596729.

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This thesis describes the use of counterpropagating pulse trains to quasi-phase-match high-harmonic generation (HHG). Two novel techniques for generating trains of ultrafast pulses are described and demonstrated. The first method makes use of a birefringent crystal array to split a single pulse into a sequence of pulses. The second method makes use of the time-varying polarisation of a chirped pulse passed through a multiple-order wave plate to generate a train of pulses by the addition of a polariser. It is demonstrated that this second technique can be used to make pulse trains with non-unif

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Gyongy, Istvan. "Phase/amplitude estimation for tuning and monitoring." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:f398b986-e8a0-403a-9118-5edae6403e00.

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The benefits of good loop tuning in the process industries have long been recognized. Ensuring that controllers are kept well-configured despite changes in process dynamics can bring energy and material savings, improved product quality as well as reduced downtime. A number of loop tuning packages therefore exist that can, on demand, check the state of a loop and adjust the controller as necessary. These methods generally apply some form of upset to the process to identify the current plant dynamics, against which the controller can then be evaluated. A simple approach to the automatic tuning

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Ocampo, Carlos Andrés Ríos. "Phase-change materials for photonic memories and optoelectronic applications." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:1c2c3179-ef9f-4fbf-b91c-c4d2f7ee7ed5.

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The content of this thesis encompasses the fundamentals, modelling, chip design, nanofabrication process, measurement setup, and experimental results of devices exploiting the optical properties of phase-change chalcogenide materials. Special attention is paid to integrated Si<sub>3</sub>N<sub>4</sub> nanophotonic circuits for optical switching and memory applications, as well as to multilayer stacks for colour modulation. Herein, the implementation of the first robust, non-volatile, phase-change photonic memory is presented. By utilising optical near-field effects for Read, Write and Erase op

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Garner, Andrew J. P. "Phase and interference phenomena in generalised probabilistic theories." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:c0017faf-cbe0-4365-a1ff-080fa031d006.

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Phase lies at the heart of quantum physics and quantum information theory. A quantum bit is qualitatively different from a classical bit as it allows for the coherent superposition of possibilities, which demonstrate different behaviours depending on the phase between them. These behaviours constitute as interference phenomena, and lie behind the existence of algorithms in quantum computing which are arguably faster than the best classical alternatives. The concept of phase is deeply steeped in the structure of Hilbert spaces: the mathematical framework that underlies quantum theory. What if q

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Baran, Stuart George. "Gas-phase detection methods using diode lasers." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:43e8ec07-9e1a-4060-bc8b-be75c8565600.

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Diode lasers are a convenient and economical source of near-infrared radiation, which may usefully be applied to a host of diﬀerent sensitive detection methods; this thesis presents novel extensions of these methods, making use of the favourable characteristics of this type of light source. The ﬁrst part of this thesis details the development of an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) apparatus, including the development of the optical system, the sample handling, and the electronics for feedback phase control. A preliminary demonstration of the system is reported

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Fulton, Sharon. "Scattering studies of excitations and phase transitions." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:45f661ac-61cc-4a0c-9e96-636866a99cf2.

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This thesis describes a diversity of scattering experiments on a number of different systems. Using time-of-flight neutron scattering, a study of polycrystalline sodium in the highmomentum limit known as the impulse approximation has been performed. The purpose of this study was to look for anharmonic effects in the neutron recoil scattering of sodium as the temperature was increased from 30K to 300K. No such effects were detected and the results agreed with an isotropic harmonic solid to an accuracy of about 4%. Two experiments were carried out on antiferromagnetic systems using triple-axis n

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Grah, Joana Sarah. "Mathematical imaging tools in cancer research : from mitosis analysis to sparse regularisation." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273243.

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This dissertation deals with customised image analysis tools in cancer research. In the field of biomedical sciences, mathematical imaging has become crucial in order to account for advancements in technical equipment and data storage by sound mathematical methods that can process and analyse imaging data in an automated way. This thesis contributes to the development of such mathematically sound imaging models in four ways: (i) automated cell segmentation and tracking. In cancer drug development, time-lapse light microscopy experiments are conducted for performance validation. The aim is to m

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Danial, John Shokri Hanna. "Imaging lipid phase separation in droplet interface bilayers." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:34bb015f-2bc1-43bb-bc29-850e0b55edac.

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The spatiotemporal organization of membrane proteins is implicated in cellular trafficking, signalling and reception. It was proposed that biological membranes partition into lipid rafts that can promote and control the organization of membrane proteins to localize the mentioned processes. Lipid rafts are thought to be transient (microseconds) and small (nanometers), rendering their detection a challenging task. To circumvent this problem, multi-component artificial membrane systems are deployed to study the segregation of lipids at longer time and length scales. In this thesis, multi-componen

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Atkins, Christopher Guy. "Laser induced fluorescence studies in the gas phase." Thesis, University of Oxford, 1986. http://ora.ox.ac.uk/objects/uuid:59381f72-98e7-44b1-86ab-e008cc4d7389.

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Laser Induced Fluorescence has been used to study rotational and vibrational energy disposal following gas phase photodissociations and reactions of small molecules. Three distinct systems have been studied. The rotational and vibrational distributions in the ground and first electronically excited states of the OH radical have been studied following the two and three photon dissociation of water using laser radiation of 266nm and 355nm wavelength respectively. The results have been compared to recent theoretical calculations and experimental investigations at different wavelengths in the same

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Jackson, George. "Phase separation in solutions of large spherical particles." Thesis, University of Oxford, 1986. http://ora.ox.ac.uk/objects/uuid:9db7de2e-b365-4433-8e14-746efb32c070.

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The effect of large size ratios of solute to solvent on the critical properties and phase behaviour of binary mixtures of spherical particles is investigated using an "augmented van der Waals" equation of state. The equation used is essentially a van der Waals equation with an improved hard sphere repulsive term. Molecular dynamics and constant-pressure Monte Carlo simulations of binary mixtures of hard spheres with different diameter ratios and mole fractions are undertaken to check the adequacy of the hard sphere equation. Good agreement is found, even for systems with large differences in s

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Thornton, Lee James. "Diode laser absorption studies of gas phase species." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:5119b209-f6ee-4525-8d01-36276eaa30a5.

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Sensitive and selective absorption spectroscopy techniques are applied to the detection of the excited species present in a range of low pressure inductively coupled plasmas (ICPs). The state densities and temperatures of various species are investigated across the parameter space accessible (plasma power and pressure) to aid in the understanding of the kinetic processes occurring. The experimental methods are based upon various forms of absorption spectroscopy, incorporating wavelength modulation and/or an optical enhancement cavity. The probing radiation is generated either directly using a

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Benson, Kevin E. C. "Aspects of the electroweak phase transition and baryogenesis." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:27c64513-bbb7-4f94-b385-4e691354a7b5.

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In this thesis we study aspects of the cosmological electroweak phase transition which are relevant to the possibility of baryogenesis at this epoch. We focus on two issues: first, requiring that the observed baryon number be of electroweak origin places strong constraints on electroweak physics, and second, baryogenesis at the electroweak scale may be driven by an asymmetry generated at the GUT scale. We use the effective potential at finite temperature as a means of analyzing phase transitions associated with spontaneous symmetry breaking. We develop the theory with two basic examples: the s

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Jiang, Long. "Crystallization and phase separation in thin film polymers." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:3288a4fa-1ee8-4f20-a192-4e4c67cfe994.

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Properties of polymers in thin films are distinct from those in the bulk due to the significant effects of free or substrate surfaces. The presence of a free surface allows an increased mobility of polymer chains in the near surface region, therefore, a lower glass transition temperature (T<sub>g</sub>). With this lower surface T<sub>g</sub>, a surface-specific crystallization phenomenon occurring at temperatures much lower than the bulk crystallization temperature (T<sub>c</sub>) in polymers including PET, PEN and PVOH has previously been observed. However, whether or not this surface-specifi

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Kimpton, Laura Saranne. "On two-phase flow models for cell motility." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:93c3cc12-4aac-424d-83bf-3e695efb49fe.

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The ability of cells to move through their environment and spread on surfaces is fundamental to a host of biological processes; including wound healing, growth and immune surveillance. Controlling cell motion has wide-ranging potential for medical applications; including prevention of cancer metastasis and improved colonisation of clinical implants. The relevance of the topic coupled with the naturally arising interplay of biomechanical and biochemical mechanisms that control cell motility make it an exciting problem for mathematical modellers. Two-phase flow models have been widely used in th

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Neil, Simon R. T. "Condensed-phase applications of cavity-based spectroscopic techniques." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:4431e46e-1226-4950-aa5d-ce22e0309ba9.

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This thesis describes the development and application of condensed-phase cavity-based spectroscopic techniques - namely cavity ring-down spectroscopy (CRDS); cavity enhanced absorption spectroscopy (CEAS); broadband cavity enhanced absorption spectroscopy (BBCEAS) and evanescent wave (EW) variants of all three. The recently-developed cavity technique of EW-broadband cavity enhanced absorption spectroscopy (EW-BBCEAS) has been used—in combination with a supercontinuum source (SC) and a sensitive, fast readout CCD detector—to record of the full visible spectrum (400–700 nm) of a silica-liquid in

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Mogni, Gabriele. "Simulations of shock-induced phase transitions in silicon." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:8f8d5f8f-941d-4167-9066-85389c4a3dd5.

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An understanding of the fundamental mechanism behind the relief of shear stress in single-crystal silicon subject to loading by shock-waves has to this day remained elusive. What is known is that this material undergoes a first-order pressure-induced polymorphic phase transition from its ambient pressure cubic-diamond (cd) crystal structure to its first stable high-pressure phase, known as β-Sn, at a pressure of about 120 kbar under hydrostatic compression. By investigating the evolution of the transition parameters for this phase transition as a function of increasing uniaxial shear stre

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Handsel, Jennifer. "Anisotropy and spin relaxation in the condensed phase." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8a268360-4e6c-4a18-96e2-f60a57b5b5df.

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<strong>Chapter 1</strong> introduces the concept of spin, how spins interact, and how the spin state in a radical pair can affect the outcome of a chemical reaction between the unpaired electrons. The computational methodology for simulating such radical pairs is also discussed. <strong>Chapter 2</strong> discusses anisotropy in the singlet recombination yield of a radical pair in a carotenoid-porphyrin-fullerene triad, containing many hyperfine couplings. The singlet yield was calculated as a function of the direction of an applied magnetic field, using symmetry in the molecule to reduce the

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Wright, Laura Jayne. "Quantum pulse shaping by direct temporal phase modulation." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1ea55458-62be-461d-a92e-1aa360995129.

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Creating and controlling well-defined single-photon states is important for many quantum enhanced technologies. Information can be encoded in any degree of freedom associated with a single-photon field excitation, for example in the polarization or transverse spatial mode structure. The ability to encode multiple qubits in these states is desirable for high data transmission rates and increased information processing capacity. The spectral-temporal domain offers a large Hilbert space for encoding information, well suited to integrated optical architectures owing to the low cross-talk between c

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Hewitt, Dominic James. "Probing environmental effects on gas-phase protein structure." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:6856e99f-c802-4b96-ba7c-8fc98456f6a0.

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Growth in the use of mass spectrometry as an analytical tool for studying protein structure and functionality has posed questions regarding correlation of native structures and observed gas-phase conformations for proteins. This thesis explores the relationship between the solution-phase and gas-phase structures of soluble proteins, and investigates the effect of the lipid environment on membrane proteins. To assess gas-phase structure, ion-mobility mass spectrometry was used to measure directly the collision cross-sections of soluble proteins across a broad mass range. These collision cross-s

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McCrudden, Garreth. "Vector correlations in gas-phase inelastic collision dynamics." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:967fbe54-98a9-48e9-a0b2-707811804d7a.

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This thesis presents a joint experimental and theoretical study of vector correlations in the electronically, vibrationally, and rotationally inelastic collisions of simple molecules with rare-gas atoms. In the first instance, empirical and calculated data are presented for rotationally inelastic scattering in the NO(X)+Ar and ND<sub>3</sub>(X̃)+Ar systems at collision energies in the range 405-2210 cm<sup>-1</sup>. These experiments - the first to be conducted on a newly commissioned crossed-molecular beam machine - measured the k-k' correlation, i.e. that between the vectors describing the r

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Zikmund, Tomáš. "Měření rychlosti objektu pomocí Fourierovy transformace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227884.

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This work deals with object speed measuring using image analysis method. The reader will become familiar with a mathematical theory upon which the method is based. The mathematical algorithm for obtaining the speed of a given object is illustrated. Furthermore, an original computer program has been developed and the results of real measuring are shown.

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Muehlemann, Anton. "Variational models in martensitic phase transformations with applications to steels." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:bb7f4ff4-0911-4dad-bb23-ada904839d73.

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This thesis concerns the mathematical modelling of phase transformations with a special emphasis on martensitic phase transformations and their application to the modelling of steels. In Chapter 1, we develop a framework that determines the optimal transformation strain between any two Bravais lattices and use it to give a rigorous proof of a conjecture by E.C. Bain in 1924 on the optimality of the so-called Bain strain. In Chapter 2, we review the Ball-James model and related concepts. We present some simplification of existing results. In Chapter 3, we pose a conjecture for the explicit form

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Ratan, Naren. "Complex phase space representation of plasma waves : theory and applications." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:af5654e3-3137-4d9a-b41d-574cd72103b2.

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This thesis presents results on the description of plasma waves in terms of wavepackets. The wave field is decomposed into a distribution of wavepackets in a space of position, wavevector, time, and frequency. A complex structure joining each pair of Fourier conjugate variables into a single complex coordinate allows the efficient derivation of equations of motion for the phase space distribution by exploiting its analytic properties. The Wick symbol calculus, a mathematical tool generalizing many convenient properties of the Fourier transform to a local setting, is used to derive new exact ph

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Cooper, Graham Alastair. "Spectroscopy and imaging of gas-phase transition metal clusters." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9db3727c-4246-4d39-95b3-83936265dfad.

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The field of transition metal clusters has proven to be fertile ground for study in recent years due to their interesting properties and reactivity. In this thesis, Velocity Map Imaging (VMI) has been used alongside spectroscopic techniques to study a range of diatomic metal-containing molecules which have relevance to cluster chemistry. The photodissociation of Ag-RG complexes (RG = Ar, Kr, Xe), as well as AgO, have been studied in the 29900-31700 cm⁻¹1 spectral region using VMI. The electronic states of the fragments produced have been assigned in each case and new values for the dissociatio

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Schiavi, Andrea. "Investigation of vibrating-hydrogen based ultrashort molecular phase modulator." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:94c3e831-9045-4d32-acc3-5ef7c6bca135.

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This thesis investigates the coherent phase modulation of ultrashort pulses using vibrating hydrogen as a molecular medium. Self-phase modulation in a gas-filled hollow core capillary allows the generation of highpower few-cycle pulses in the NIR. Such pulses can be used to drive high harmonic generation (HHG) to deliver attosecond duration pulses in the extreme ultraviolet and soft X-ray spectral region. While reaching unrivalled pulse durations (down to 67 as), these sources have characteristically low efficiencies. The pump-probe spectroscopy community would greatly benefit from brighter sh

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Liu, Lewis. "Polarisation controlled quasi-phase matching of high harmonic generation." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:8a5c65ae-d099-440e-beaa-6e514b4545dc.

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This thesis focuses on the development of high harmonic generation (HHG) by using polarisation controlled quasi-phase matching QPM as well as related topics. A new class of QPM techniques called polarisation-controlled QPM is introduced where linear or circlar birefringence enables the modulation of the driving field's polarisation state called polarisation-beating QPM (PBQPM) for linear birefringence and optical rotation QPM (ORQPM) for circular birefringence respectively. PBQPM uses a linear birefringence to modulate periodically the driving pulse between linear and circular/elliptical polar

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De, Wet Sarel Joubert. "Development of a system for tracking objects in a confined space / S.J. de Wet." Thesis, North-West University, 2009. http://hdl.handle.net/10394/4010.

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Cassidy, Scott L. "Millimetre-wave FMCW radar for remote sensing and security applications." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7856.

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This thesis presents a body of work on the theme of millimetre-wave FMCW radar, for the purposes of security screening and remote sensing. First, the development of an optimised software radar signal processor will be outlined. Through use of threading and GPU acceleration, high data processing rates were achieved using standard PC hardware. The flexibility of this approach, compared to specialised hardware (e.g. DSP, FPGA etc…), allowed the processor to be rapidly adapted and has produced a significant performance increase in a number of advanced real-time radar systems. An efficient tracker

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Wu, Hua. "Ensemble based quantum memory and adiabatic phase gates in electron spins." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:d2564f17-127b-429b-a676-6fb2cae2a546.

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Quantum computing has been a new and challenging area of research since the concept was put forward in 1980s. A quantum computer is a computer that processes information encoded in systems that exhibit quantum properties and is proved in theory to be more powerful than classical computers. Various approaches to the implementation of the quantum computers have been studied over the decades, each of them having their own advantages and disadvantages in terms of the lifetime of the quantum information, processing time, and scalability of the implementation. Proposals for hybrid quantum processors

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