Browsing by Title
Now showing items 2938-2957 of 4790
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On some nonlinear partial differential equations for classical and quantum many body systems
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsClare Hall, 2012-11-13)This thesis deals with problems arising in the study of nonlinear partial differential equations arising from many-body problems. It is divided into two parts: The first part concerns the derivation of a nonlinear diffusion ...
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On some partial differential equation models in socio-economic contexts - analysis and numerical simulations
(University of CambridgeDepartent of Applied Mathhematics and Theoretical PhysicsTrinity College, 2012-01-10)This thesis deals with the analysis and numerical simulation of different partial differential equation models arising in socioeconomic sciences. It is divided into two parts: The first part deals with a mean-field price ...
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On Spatial Conjunction as Second-Order Logic
(2004-10-25)Spatial conjunction is a powerful construct for reasoning about dynamically allocateddata structures, as well as concurrent, distributed and mobile computation. Whileresearchers have identified many uses of spatial ...
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On strategic default and liquidity risk
(CFAP, Cambridge Judge Business School, University of Cambridge, 2002)How does the uncertain provision of external finance affect investment projects' default probability and liquidity risk? In this paper, I study the strategic interaction between many creditors and a single borrower in the ...
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On superconformal anyons
(SpringerJournal of High Energy Physics, 2016-01-22)In d = 2+1 dimensions, there exist field theories which are non-relativistic and superconformal. These theories describe two species of anyons, whose spins differ by 1/2, interacting in a harmonic trap. We compute the ...
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On supporting K-anonymisation and L-diversity of crime databases with genetic algorithms in a resource constrained environment
(University of Cape TownFaculty of ScienceDepartment of Computer Science, 2015)The social benefits derived from analysing crime data need to be weighed against issues relating to privacy loss. To facilitate such analysis of crime data Burke and Kayem [7] proposed a framework (MCRF) to enable mobile ...
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On the $\phi$-Selmer groups of the elliptic curves y$^2$ = x$^3$ - Dx
(Cambridge University PressMathematical Proceedings of the Cambridge Philosophical Society, 2016-09-09)We study the variation of the $\phi$-Selmer groups of the elliptic curves y$^2$ = x$^3$ − Dx under quartic twists by square-free integers. We obtain a complete description of the distribution of the size of this group when ...
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On the Absence of Uniform Recovery in Many Real-World Applications of Compressed Sensing and the Restricted Isometry Property and Nullspace Property in Levels
(Society for Industrial and Applied MathematicsSiam Journal on Imaging Sciences, 2017-03-15)The purpose of this paper is twofold. The first is to point out that the property of uniform recovery, meaning that all sparse vectors are recovered, does not hold in many applications where compressed sensing is successfully ...
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On the Adaptive Real-Time Detection of Fast-Propagating Network Worms
(2006-11-10)We present two light-weight worm detection algorithms thatoffer significant advantages over fixed-threshold methods.The first algorithm, RBS (rate-based sequential hypothesis testing)aims at the large class of worms that ...
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On the Boltzmann equation, quantitative studies and hydrodynamical limits
(University of CambridgeDepartment of Pure Mathematics and Mathematical StatisticsCambridge Centre for Analysis, 2014-11-11)The present thesis deals with the mathematical treatment of kinetic theory and focuses more precisely on the Boltzmann equation. We investigate several properties of the solutions to the latter equation: their positivity ...
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On The Boolean Algebra of Shape Analysis Constraints
(2003-08-22)Shape analysis is a promising technique for statically verifyingand extracting properties of programs that manipulatecomplex data structures. We introduce a new characterizationof constraints that arise in parametric ...
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On the Cauchy Problem for the Homogeneous Boltzmann-Nordheim Equation for Bosons: Local Existence, Uniqueness and Creation of Moments
(SpringerJournal of Statistical Physics, 2016)The Boltzmann-Nordheim equation is a modification of the Boltzmann equation, based on physical considerations, that describes the dynamics of the distribution of particles in a quantum gas composed of bosons or fermions. ...
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On the Complexity of ID/LP Parsing
(1984-12-01)Recent linguistic theories cast surface complexity as the result of interacting subsystems of constraints. For instance, the ID/LP grammar formalism separates constraints on immediate dominance from those on linear ...
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On the convective overstability in protoplanetary discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-01-21)This paper explores the driving of low-level hydrodynamical activity in protoplanetary-disc dead zones. A small adverse radial entropy gradient, ordinarily stabilized by rotation, excites oscillatory convection (‘convective ...
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On the Convergence of Stochastic Iterative Dynamic Programming Algorithms
(1993-08-01)Recent developments in the area of reinforcement learning have yielded a number of new algorithms for the prediction and control of Markovian environments. These algorithms, including the TD(lambda) algorithm of Sutton ...
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On the difficulty of feature-based attentional modulations in visual object recognition: A modeling study.
(2004-01-14)Numerous psychophysical experiments have shown an important role for attentional modulations in vision. Behaviorally, allocation of attention can improve performance in object detection and recognition tasks. At the neural ...
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On the difficulty of feature-based attentional modulations in visual object recognition: A modeling study.
(2004-01-14)Numerous psychophysical experiments have shown an important role for attentional modulations in vision. Behaviorally, allocation of attention can improve performance in object detection and recognition tasks. At the neural ...
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On the Dirichlet Prior and Bayesian Regularization
(2002-09-01)A common objective in learning a model from data is to recover its network structure, while the model parameters are of minor interest. For example, we may wish to recover regulatory networks from high-throughput data ...
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On the Effect of Surface Texture and Nanoscale Surface Oxides on the Optical and Mechanical Properties of Silicon Single Crystals and MEMS Thin films
(2015-11-15)This dissertation presents the combined results of analytical, computational and experimental study of the effects of surface texture and nanoscale surface oxides on the optical and mechanical properties of silicon single ...
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On the Einstein-Weyl and conformal self-duality equations
(AIP PublishingJournal of Mathematical Physics, 2015-08-03)The equations governing anti-self-dual and Einstein-Weyl conformal geometries can be regarded as ‘master dispersionless systems’ in four and three dimensions respectively. Their integrability by twistor methods has been ...
