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Thematische Bibliographien / Two objects / Dissertationen

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Dissertationen zum Thema „Two objects“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Edwards, Peter Ivan Edwards Peter Ivan. "Two explorations in musical objects /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3170275.

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Thesis (Ph. D.)--University of California, San Diego, 2005.<br>Includes 2 compositions: Puer natus est nobis (zu irgendeiner Zeit) for full orchestra, and Annicha, for flute, clarinet, and piano. Vita. Includes audio reel tape of compositions (analog, stereo., 7 1/2 ips : 7 in.).

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Duchi, Enrica. "ECO method and object grammars : two methods for the enumeration of combinatorial objects." Nice, 2003. http://www.theses.fr/2003NICE4010.

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Cette thèse se situe dans le domaine de la combinatoire énumérative et bijective. La thèse commence par une introduction sur les structures et les méthodes qui sont ensuite utilisées. Puis elle se divise en deux parties. La première analyse des problèmes liés à ECO. En particulier, on analyse le problème de monter des règles de succession équivalentes. Plus précisément, on introduit des classes de règles équivalentes et on démontre l’équivalence en utilisant la méthode ECO. Dans le chapitre 3, on montre comment déterminer des règles de succession associées à une grande classe de récurrences li

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3

Rastello, Sara. "Multifrequency VLBA observations of two compact symmetric objects." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8913/.

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In this thesis the results of the multifrequency VLBA observations of the GPS 1944+5448 and the HFP J0111+3906 are presented. They are compact objects smaller than about 100 pc, completely embedded in the host galaxy. The availability of multi-epoch VLBI observations spanning more than 10 years, allowed us to compute the hot spot advance speed in order to obtain the kinematic age of both sources. Both radio sources are young, in agreement with the idea that they are in an early evolutionary stage. The spectral analysis of each source component, such as the lobes, the hot spots, the core and th

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Hann, Christopher Eric. "Recognising two planar objects under a projective transformation." Thesis, University of Canterbury. Mathematics and Statistics, 2001. http://hdl.handle.net/10092/1785.

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This thesis involves solving problems associated with object recognition for two dimensional images under a projective transformation. In order to recognise an object under any viewing angle requires invariant features to be identified. These invariant features can be used to match two images arising from two different views of a single object. One invariant is the projective curvature which characterises all curves up to a projective transformation. However the projective curvature depends on seventh order derivatives so is very sensitive to noise in the discretisation of the images and is of

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5

McAndrew, Patrick. "Recognising and locating objects in two dimensional perspective views." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/853.

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6

Clemens, David T. "The recognition of two-dimensional modeled objects in images." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/27950.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING<br>Bibliography: p. 108.<br>by David T. Clemens.<br>M.S.

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Klapez, Martin. "A study of two Languages for Active Objects with Futures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5691/.

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In computer systems, specifically in multithread, parallel and distributed systems, a deadlock is both a very subtle problem - because difficult to pre- vent during the system coding - and a very dangerous one: a deadlocked system is easily completely stuck, with consequences ranging from simple annoyances to life-threatening circumstances, being also in between the not negligible scenario of economical losses. Then, how to avoid this problem? A lot of possible solutions has been studied, proposed and implemented. In this thesis we focus on detection of deadlocks with a static program analysi

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Hunter, Jerry James 1964. "Planning stable in-hand reconfiguration of objects in two dimensions." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278194.

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This thesis presents a method to reconfigure objects in an articulated robotic hand, where reconfiguration is defined as moving an object from one orientation in the hand to another orientation. Several methods using object configuration rely on a stationary work area. These methods assume that the object is stably grasped by the hand, and is moved around the work area in an assembly process. This thesis assumes that the hand is the primary obstacle. The object now reacts to the hand instead of the work area. Reconfiguration of the object within the hand is the goal. Models were developed that

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Nightingale, Trevor R. T. "Acoustic diffraction by two and three dimensional objects using integral techniques." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/2124.

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10

Welch, Thaddeus B. "Electromagnetic scattering from two dimensional objects using the Field Feedback Formulation." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25894.

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11

Davies, Ioan Tudur. "Sedimentation of circular and elliptical objects in a two-dimensional foam." Thesis, Aberystwyth University, 2009. http://hdl.handle.net/2160/97552d65-3e01-4afc-a576-ef0bd11e0fff.

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The rheology of a two-dimensional dry foam is probed with quasi-static bubblescale simulations of the sedimentation of circular discs and elliptical objects. The sedimenting objects move in response to a combination of their weight and the forces exerted on them by the network of soap films and the pressures in the bubbles. Viewed macroscopically, the plasticity and elasticity of the foam combine to determine the rate of descent of a circular disc. A critical disc weight is found that determines whether the disc is supported by the foam or not. This critical weight increases linearly with disc

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12

Zhen, Yi. "Numerical Simulation of Dropped Cylindrical Objects into Water in Two Dimensions (2D)." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2568.

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The dropped objects are identified as one of the top ten causes of fatalities and serious injuries in the oil and gas industry. It is of importance to understand dynamics of dropped objects under water in order to accurately predict the motion of dropped objects and protect the underwater structures and facilities from being damaged. In this thesis, we study nondimensionalization of dynamic equations of dropped cylindrical objects. Nondimensionalization helps to reduce the number of free parameters, identify the relative size of effects of parameters, and gain a deeper insight of the essential

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Poeschel, Friedrich Gerd. "Signals in two-sided search." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:c1decfbb-5fdf-4c13-805e-2cc7fe115641.

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We introduce signals to search models of two-sided matching markets and explore the implications for efficiency. In a labour market model in which firms can advertise wages and workers can choose effort, we find that advertisements can help overcome the Diamond paradox. Advertisements fix workers' beliefs, so that workers will react if firms renege on advertisements. Firms then prefer to advertise truthfully. Next, we consider a market with two-sided heterogeneity in which types are only privately observable. We identify a simple condition on the match output function for agents to signal thei

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Cox, Courtney Marie. "Two problems in dynamic ethics." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:aa01c397-0211-4c70-8938-3c4a443798ca.

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Time raises a host of difficult ethical questions. This doctoral project focuses on two: 1. How are "static" comparative principles (e.g. equality, desert) to be understood over time? (The Problem of Fairness & Time) 2. How might separation (in time) between agents, objects, and threats affect claims to the relevant resources? (The New Problem of Temporal Distance) My work begins with a simple observation: our prima facie intuitions about the value of simple distributions change depending on whether such cases are presented as static (occurring at one time) or dynamic (extended over time). Fur

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Bennett, Philip Mark. "Two-photon dyes for biological application." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b8cb9ce4-35eb-433c-86fc-b5df53a2e566.

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Two photon absorption (TPA) is the near simultaneous absorption of two photons of light to achieve an electronically excited state. It has led to huge advances in microscopy and microfabrication due to its quadratic dependence on the local light intensity. This thesis describes the design, synthesis and application of dyes with strong TPA properties, and as such is divided into three chapters. The first introduces the theory and measurement of TPA as well as structure-property relationships known to maximise the efficiency of TPA. The subsequent chapters present explorations of the application

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JeongAhn, Youngmin, and Renu Malhotra. "Simplified Derivation of the Collision Probability of Two Objects in Independent Keplerian Orbits." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624717.

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Many topics in planetary studies demand an estimate of the collision probability of two objects moving on nearly Keplerian orbits. In the classic works of Opik and Wetherill, the collision probability was derived by linearizing the motion near the collision points, and there is now a vast amount of literature using their method. We present here a simpler and more physically motivated derivation for non-tangential collisions in Keplerian orbits, as well as for tangential collisions that were not previously considered. Our formulas have the added advantage of being manifestly symmetric in the pa

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ABHARI, FARIDEH. "Fabrication of 3D micro-objects by two-photon lithography for optical tweezers manipulation." Doctoral thesis, Università degli Studi di Trieste, 2017. http://hdl.handle.net/11368/2908156.

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In the last decade Optical Tweezers (OT) and Two Photon Polymerization (TPP), two already established techniques for contactless manipulation of micro-objects in liquids and for the fabrication of three-dimensional micro-objects of arbitrary shape, respectively, have consolidated their presence in the laboratory practice, not only as subject of scientific and technical investigations, but also as convenient tools for applications to other fields. This thesis tries to combines these worlds, using TPP to fabricate micro-objects that could be trapped and actuated by OT, with the aim of pushing f

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Miller, Richard. "Two approaches to architecture-independent parallel computation." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:e40bd426-9660-468e-96e2-3281a9159909.

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Two approaches to architecture-independent parallel computation are investigated: a constructive functional notation for specifying implicitly parallel operations on multidimensional arrays, and an extension to imperative sequential programming languages for implementing bulk-synchronous parallel algorithms. An algebra of multidimensional rectangular arrays is defined constructively, by means of an injective singleton operator which maps each value from a base type into a one-element array, and a set of join operators which map a pair of arrays into their concatenation along one of a set of di

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Townsend, Alex. "Computing with functions in two dimensions." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:02f92917-809e-477d-8413-417bb8106e56.

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New numerical methods are proposed for computing with smooth scalar and vector valued functions of two variables defined on rectangular domains. Functions are approximated to essentially machine precision by an iterative variant of Gaussian elimination that constructs near-optimal low rank approximations. Operations such as integration, differentiation, and function evaluation are particularly efficient. Explicit convergence rates are shown for the singular values of differentiable and separately analytic functions, and examples are given to demonstrate some paradoxical features of low rank ap

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BONOME, YADIRA GARNICA. "PROPOSING TWO NEW HANDLING INTERACTION TECHNIQUES FOR 3D VIRTUAL OBJECTS USING THE MYO ARMBAND." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30744@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Flexibilidade e liberdade são sempre desejados em ambientes de realidade virtual. Dispositivos de entrada tradicionais, como mouse ou teclado, dificultam as interações entre o usuário e o ambiente virtual. Para melhorar a interação em termos qualitativos em um ambiente virtual, a interação deve ser tão natural quanto possível, por isso, gestos com a mão se tornaram um meio popular para a interação humanocomputador. O desenvolvimento de dispos

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Clarke, Simon James. "An experimental study of some two-dimensional antiferromagnets." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:a559d173-edd3-4c9b-aa6e-a09a6d0fd37f.

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This thesis discusses the investigation of the two-dimensional S = œ Heisenberg antiferromagnet copper formate tetrahydrate (CFTH) and the layered triangular lattice material NaTi0<sub>2</sub> which was thought to be a candidate for the possession of a non-classical antiferromagnetic ground state due to the frustration inherent in a triangular antiferromagnet. Single crystals of CFTH are investigated using elastic, quasielastic and inelastic neutron scattering, electron spin resonance (ESR) spectroscopy and DC magnetometry. Using the appropriate theory, these measurements are used to determine

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Skinner, Thomas Olof Edwin. "Two-dimensional colloidal systems : grain boundaries and confinement." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:e5407868-7c67-4252-9867-6955d9b71825.

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The behaviour of colloidal particles in two-dimensional (2D) systems is addressed in real space and time using magnetic fields, optical tweezers and optical video microscopy. First, the fluctuations of a grain boundary in a 2D colloidal crystal are analysed. A real space analogue of the capillary fluctuation method is derived and successfully employed to extract the key parameters that characterise the grain boundary. Good agreement is also found with a fluctuation-dissipation based method recently suggested in simulation. Following on from analysis of the interface fluctuations, the propertie

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23

Blades, Gareth. "Re-engineering bacterial two-component signalling systems." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:2865c02d-c208-45fa-8108-d8ced9486c19.

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Bacteria use Two Component Systems (TCS) to sense and respond to changes in their external environment. TCS are used to navigate to nutrients or away from toxins (chemotaxis) and to adapt to changes in osmolarity (osomosensing). TCS are composed of a histidine protein kinase (HPK) which trans-autophosphorylates in response to environmental change, transferring the phosphoryl group to a cognate response regulator (RR). Phosphorylated RRs modulate an output response such as protein-protein interaction for chemotaxis, and transcription for osmosensing. RRs are composed of a conserved amino termin

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Funnell, Timothy. "Characterisation of the human two-pore channels." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:8c148321-5c6d-4942-ac31-3a4ca3791077.

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The Ca²⁺-mobilising messenger NAADP has been shown to play a key role in the regulation of mammalian physiology. Recently, the two-pore channels (TPCs) have been proposed as an NAADP-gated Ca²⁺ channel. Chapter 1 introduces the TPCs as the major candidates in governing NAADP-mediated Ca²⁺-release from acidic stores. Chapter 2 explains the methodologies developed and used. Chapter 3 demonstrates the successful immunopurification of HsTPC2 and its incorporation into an artificial lipid bilayer. K⁺ and Ca²⁺ currents were seen in reponse to nM - μM concentrations of NAADP; with the open probabilit

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Beer, Ann. "The use of two languages in Samuel Beckett's art." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:fe430cb4-ec07-4f18-9d4a-6860b0d85fbb.

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This study argues that Samuel Beckett's works in English and French reveal the organising energy of a "bilingual consciousness". Bilingualism is no personal eccentricity but the foundation for Beckett's mature art, without which it could not have developed. He has never been a unilingual writer; at every stage of his career his two languages have enriched, challenged and opposed each other. Bilingual art has allowed Beckett to move between linguistic circles, claiming as his own a transitional space that has protected his need for imaginative solitude. Gradually abandoning the cultural specifi

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Melia, Tom. "NLO QCD And two weak bosons at the LHC." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:e55bde16-1aa0-4a6f-a19a-5437b6b901f2.

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We present original calculations of standard model processes involving two weak bosons at NLO in QCD, and study related phenomenology with reference to Higgs boson and new physics searches at the LHC. We employ a new theoretical technique, D-dimensional generalised unitarity, to obtain the multi-particle, one-loop scattering amplitudes for the processes pp → W<sup>+</sup>W<sup>-</sup> + 1j, pp → W<sup>+</sup>W<sup>-</sup> + 2j, pp → W<sup>+</sup>W<sup>+</sup> + 2j, and gg → W<sup>+</sup>W<sup>-</sup>g. We consider the LHC phenomenology of: the W<sup>+</sup>W<sup>-</sup> + n jets background to

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Sorgiovanni, Ben. "Reconciling content-externalism and self-knowledge : two frameworks considered." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:dde7b307-da02-412a-9022-289fefc7dd6d.

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In this thesis, I assess the prospects for reconciling content-externalism and crucial guiding intuitions about self-knowledge within two different frameworks, respectively. The first framework belongs to the prominent contemporary externalist, Tyler Burge. The second framework is built from central strands of thought in Ludwig Wittgenstein's later work. I argue that a tension between the basic externalist intuition and crucial guiding intuitions about self-knowledge arises within a Burgean framework which does not arise within a Wittgensteinian framework. I show that given Burge's views about

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Gola, Paweł. "Essays on two-sector matching, status rewards and liability." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:d2476ffb-3853-4e5b-bdc2-4105db6036c3.

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This thesis consists of three self-contained chapters. Chapter 1 develops a two-sector, bivariate matching model, in which each sector uses a different dimension of skill in the production process. I show there exists a unique assignment of agents to sectors and derive comparative statics. The main result is that if jobs are scarce, both an increase in sector one skills' spread and a technological improvement increase the supply of talent in sector one, but decrease it in sector two. In sector two, this raises wages and wage inequality. In sector one, the effects are ambiguous in general, but

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Thorneywork, Alice L. "Structure and dynamics of two-dimensional colloidal hard spheres." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:c0929b42-c819-4782-a555-083513e396ea.

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The structural and dynamic behaviour of quasi-two-dimensional monodisperse and bidisperse colloidal hard spheres are studied by optical microscopy. Firstly, a full characterisation of the equilibrium structure is presented through a consideration of structural correlation functions and number fluctuations. Comparison to fundamental measure theory and Monte Carlo simulations confirms both the behaviour of the system as a model for hard disks and the equation of state. The differing structural behaviour of binary systems at different size ratios is also discussed in relation to the nonadditivity

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Reza, Hasnain. "Detection, location, and trajectory tracing of moving objects in the real world two-dimensional images." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182869492.

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31

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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Mitchell, Andrew Keith. "Two-channel Kondo phases in coupled quantum dots." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:3d4e9d86-794c-441c-9d4b-20e6f1bd1de1.

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We investigate systems comprising chains and rings of quantum dots, coupled to two metallic leads. Such systems allow to study the competition between orbital and spin degrees of freedom in a nanodevice, and the effect this subtle interplay has on two-channel Kondo (2CK) physics. We demonstrate that a rich range of strongly correlated electron behaviour results, with non-Fermi liquid 2CK phases and non-trivial phase transitions accessible. We employ physical arguments and the numerical renormalization group (NRG) technique to analyse these systems in detail, examining in particular both thermo

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Korzycka, Karolina Anna. "Two-photon sensitive protecting groups for biological application." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:7e895ed2-04a5-4c0b-9105-74461eae8796.

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Caged compounds are a class of photosensitive reagents used to stimulate cells with spatial control down to a sub-cellular level, and millisecond temporal control. They comprise of biologically important molecule which is modified with a photolabile protecting group. In the absence of light, caged compounds are physiologically silent but irradiation with light induces the release of biologically active species. Illumination under two-photon conditions is particularly advantageous as it enables restriction of the photolysis volume to ~1 fL and it provides deeper penetration into scattering samp

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Huang, Nathaniel Jian. "Magnetotransport in graphene and related two-dimensional systems." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:4944f2d4-83e5-44ee-90f5-faa35acac80f.

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This thesis describes studies on two-dimensional electron gases (2DEG) in graphene and related 2D systems. Magnetotransport investigations specifically in graphene and its bilayer system are demonstrated in detail, while the experimental techniques presented in this thesis are widely applicable to a large variety of other 2D materials. Chapter 1 gives an introduction and motivation for the principal topic presented in this thesis, with a general introduction to carbon nano-materials and an overview of the current state of graphene-related research and technological development (RTD). Chapter 2

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He, Zhengyu. "Tuning the electrical and optical properties of two dimensional materials." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:d794f6ee-8ea8-4c28-b199-6dbe28992e52.

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The emergence of 2D materials inspires the pursuit of all-2D materials based devices which are predicted to outperform those with conventional architectures and materials. To achieve this goal, thorough understanding of the fundamental electrical and optical properties of 2D materials separately and the ability to manipulate these properties via external modulation methods are essential. Graphene can perform as transparent electrodes, yet suffering from its high sheet resistance. It was demonstrated that it can be greatly reduced via doping iron (III) chloride solution onto graphene film with

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Tinti, Paola. "Between two civilisations : history and self representation of Bangladeshi Buddhism." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:fe2861b7-4ec2-4830-810d-a6f60a3e4246.

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Buddhism is believed to have all but died out in India following the thirteenth century Muslim invasion. However, in Bengal groups of non-Bengali people have continued to practice Therāvada Buddhism, which they are said to have imported from nearby Burma, or which they were converted to from other forms of Buddhism after migrating to Bengal. Their practices were "reformed" in 1856 by Burmese monks. An analysis of the historical material reveals a tendency by non-Buddhist Bengalis to downplay any relationship between the Buddhist traditions of Burma and Bangladesh, and to represent Buddhism as

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Noonan-Ganley, Joseph. "The contagion of desire : two case studies of appropriation art." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:d86430f7-41dd-4b85-b094-2e256b899d9c.

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My doctoral thesis is comprised of two bodies of research: two artworks taking the form of installations (videos, audio recordings, textiles, texts), which will be exhibited for viva. Femme Fabrications, 2016, is made from research into the American artist Joseph Cornell's (1903-1972) source materials held in the Smithsonian American Art Museum alongside research on Jean Wilkinson's 1977 book Flower Fabrications. A series of textile works encased in silk lined boxes trace my step-by-step construction of a rose from organdie. The floral emblem of the white rose (dried), 'death is preferable to

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Lam, Andy Ka Ming. "Electrophysiological characterization of the human two-pore channel 2." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:3a16d16e-f692-40d7-87f7-920151896038.

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The Two-pore channel (TPC1-3) family represents a recently identified class of endolysosomal ion channels. TPCs were originally proposed to be promising candidate channels for NAADP-induced Ca<sup>2+</sup> release. However, subsequent studies have emerged to propose an alternative view where TPCs may be Na+-selective channels regulated by the lysosome-specific phosphoinositide PI(3,5)P2 or voltage in an isoform-dependent manner. This thesis asks the question of whether pharmacological and ion permeation properties of TPCs, in particular the human TPC2, may satisfy or may be consistent with the

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Docherty, Callum James. "Terahertz spectroscopy of graphene and other two-dimensional materials." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:98c03952-dc3f-442b-bbc0-d8397645cc1b.

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In this thesis, two-dimensional materials such as graphene are tested for their suitability for opto-electronic applications using terahertz time domain spectroscopy (THz-TDS). This ultrafast all-optical technique can probe the response of novel materials to photoexcitation, and yield information about the dynamics of the material systems. Graphene grown by chemical vapour deposition (CVD) is studied using optical-pump THz-probe time domain spectroscopy in a variety of gaseous environments in Chapter 4. The photoconductivity response of graphene grown by CVD is found to vary dramatically depen

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Lavergne, François Alexandre. "Dynamics of grain boundaries in two-dimensional colloidal crystals." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:257cdd07-1f0d-46b4-9d8f-8530711dafb4.

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The dynamics of grain boundaries in two-dimensional colloidal crystals is studied using optical microscopy and holographic optical tweezing. First, grain growth in a polycrystalline monolayer is investigated. The bond-orientational correlation function is found to satisfy scaling features predicted for systems containing random domain walls. The time-evolution of the correlation length indicates abnormal grain growth, which is shown to be due to the preferential coarsening of the large angle grain boundaries. Next, the segregation of impurities to grain boundaries is studied by embedding large

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Eser, Sophie. "The responsible man : a study in two private prisons." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:8274c151-0121-4804-8965-89d48d7d8d25.

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With the expansion of the use of private prisons and detention centres worldwide and the increasing involvement of private actors in the provision of custodial services, this doctoral thesis considers life inside two private prisons in England. Using theoretically informed ethnography it evaluates the effect of responsibility on men imprisoned in two private prisons in England. Firstly, it briefly reviews the background and development of prison privatisation in England and Wales and considers the role and place of private prisons as part of a wider neo-liberal shift. Secondly, using qualitati

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de, Beyer Jennifer Anne. "Roles of the two chemotaxis clusters in Rhodobacter sphaeroides." Thesis, University of Oxford, 2013. https://ora.ox.ac.uk/objects/uuid:51a1c753-25d6-4e4f-b09e-eb48bce9e4cb.

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Bacteria swim towards improving conditions by controlling flagellar activity via signals (CheY) sent from chemosensory protein clusters, which respond to changing stimuli. The best studied chemotactic bacterium, E. coli, has one transmembrane chemosensory protein cluster controlling flagellar behaviour. R. sphaeroides has two clusters, one transmembrane and one cytoplasmic. The roles of the two clusters in regulating swimming and chemosensory behaviour are explored here. Newly-developed software was used to measure the effect of deleting or mutating each chemotaxis protein on unstimulated swim

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Chang, Fu-Sheng. "Analysis of two pore channel proteins in Dictyostelium development." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:982eb7bf-900b-4971-9cf5-203125e6557e.

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Calcium is a ubiquitous intracellular signal responsible for controlling numerous cellular responses including development and proliferation. Calcium (Ca<sup>2+</sup>) is stored in both neutral and acidic stores and its release through gated channels has been implicated in regulating development in Dictyostelium discoideum. This thesis aims to understand the roles of the calcium channel proteins, in particular the two-pore channel proteins (TPCs), found on acidic stores in Ca<sup>2+</sup> signalling during Dictyostelium development. Bioinformatic analysis indicates conservation of a gene encod

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Moon, Bill. "Employment of Crystallographic Image Processing Techniques to Scanning Probe Microscopy Images of Two-Dimensional Periodic Objects." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/699.

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Thin film arrays of molecules or supramolecules are active subjects of investigation because of their potential value in electronics, chemical sensing, catalysis, and other areas. Scanning probe microscopes (SPMs), including scanning tunneling microscopes (STMs) and atomic force microscopes (AFMs) are commonly used for the characterization and metrology of thin film arrays. As opposed to transmission electron microscopy (TEM), SPMs have the advantage that they can often make observations of thin films in air or liquid, while TEM requires highly specialized techniques if the sample is to be in

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Greenstein, Daniel I. "Urban politics and the urban process : two case studies of Philadelphia." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:ed50068a-eeb2-433a-b2ab-279c7296b95f.

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Both academics and the makers of public policy have for a long time been interested in the study of urban politics, but the subject needs to be integrated with the process of urban growth and development. Too frequently, the urban polity is analyzed as an arena which passively reflects or mechanically responds to more fundamental changes in the urban social structure. In this work, case studies of political reform in Philadelphia at two periods, 1800 to 1854 and 1890 to 1915, develop a number of hypotheses about how the urban polity plays an influential role in shaping the process of urban gro

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De, Angelis Franco. "The evolution of two archaic Sicilian poleis : Megara Hyblaia and Selinous." Thesis, University of Oxford, 1996. http://ora.ox.ac.uk/objects/uuid:f2347179-5efc-4cbe-881b-8bd5579c5849.

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This study attempts to revive T.J. Dunbabin's multi-dimensional approach to the history of Early Iron Age Sicily in The Western Greeks (Oxford 1948). Dunbabin recognised that archaic Sicily had no real history, and that any historical account involved combining the very scant documentary record with the fuller and ever-growing body of archaeological evidence to produce a framework for writing social and economic history. These innovative methods ended with Dunbabin, however: today the field is dominated by scholars impeded artificially by disciplinary boundaries, which discourage the productiv

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Lenhardt, Rastislav. "Two variable and linear temporal logic in model checking and games." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:b4de8937-4a4a-4281-92e7-aa4e93283250.

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Model checking linear-time properties expressed in first-order logic has non-elementary complexity, and thus various restricted logical languages are employed. In the first part of this dissertation we consider two such restricted specification logics on words: linear temporal logic (LTL) and two-variable first-order logic (FO2). LTL is more expressive but FO2 can be more succinct, and hence it is not clear which should be easier to verify. We take a comprehensive look at the issue, giving a comparison of verification problems for FO2, LTL, and various sublogics thereof across a wide range of

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Lee, Wei-Koon. "Chaotic mixing in wavy-type channels and two-layer shallow flows." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:f5fcbe34-babb-4fae-9204-28de8774eb98.

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This thesis examines chaotic mixing in wavy-type channels and two-layer shallow water flow. For wavy-type channels, the equations of motion for vortices and fluid particles are derived assuming two-dimensional irrotational, incompressible flow. Instantaneous positions of the vortices and particles are determined using Lagrangian tracking, and are conformally mapped to the physical domain. Unsteady vortex motion is analysed, and vortex-induced chaotic mixing in the channels studied. The dynamics of mixing associated with the evolution of the separation bubble, and the invariant manifolds are ex

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Walter, Sarah E. "One for you, two for me : quantitative sharing by young children." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:bdf38c29-1fda-41ab-b1c1-c675bc1d39c4.

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The current research aimed to examine children’s understanding of cardinality by looking at their ability to use several quantitative concepts that underpin this understanding: correspondence, counting and equivalence in the context of sharing. Understanding cardinality requires children to develop knowledge about the relations between these quantitative concepts which is important for the development of mathematical reasoning. The first study aimed to investigate how flexibly children can use correspondence to build equivalent sets in different types of sharing scenarios: equal sharing, recip

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Al-Assam, Sarah. "Quantum simulation using ultracold atoms in two-dimensional optical lattices." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:9a7ade78-561d-4d8d-87e4-1781c6b8454c.

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Ultracold atoms in optical lattices can be used to model condensed matter systems. They provide a clean, tuneable system which can be engineered to reach parameter regimes that are not accessible in condensed matter systems. Furthermore, they provide different techniques for probing the properties of these systems. This thesis presents an experimental and theoretical study of ultracold atoms in optical lattices for quantum simulation of two-dimensional systems.The first part of this thesis describes an experiment with a Bose-Einstein condensate of 87Rb loaded into a two-dimensional optical lat

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