Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Singular Points"”.
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Solvability of differential systems near singular points
… + C(z)y'(αz) in the neighborhood of the singularity at z = 0"--Abstract, page 2.</p>
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The Investigation of Crossflow Velocity and Off-the-Surface Streamtrace Topology for a Moderately Swept Wing at Transonic Mach Numbers
… number of 0.8. An overview of flow topology and singular point theory is given as a means to describe the flow field and describe the differences between it at various angles of attack. After performing an investigation of the crossflow velocity traces it was verified that the use of a line of …
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A Classification of Kupka-Smale Flows on the Torus
… of those flows on the torus satisfying: (1) all singular points and closed orbits are hyperbolic; and (2) there are no saddle connections. Such flows are known as Kupka-Smale flows. In the process of generating invariants for the classification a qualitative picture is produced describing the …
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Some aspects of the numerical solution of equilibrium problems in finite elasticity
… and for determining on such a curve all the singular points (both limit and bifurcation points). Further methods are then presented which allow branching onto secondary paths (subsets of secondary surfaces) from bifurcation points in order to trace out these paths and so determine the …
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Analytic aspects of periodic instantons
… T³, called spatially-periodic instanton. It is a singular monopole over T³, a solution to the Bogomolny equation, whose rank is computed and behavior at the singular points is understood under certain conditions. A full description of the Riemannian ADHMN construction of instantons on R⁴ is given, …
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Iterative Connections and Abhyankar's Conjecture
… Galois groups of IPV-extensions with restricted singular locus. In this thesis, I prove the differential Abhyankar conjecture for connected groups and give necessary and sufficient conditions for connected groups for being realisable with given singular points.
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Computing the Zeta Function of Two Classes of Singular Curves
… the case of superelliptic curves with singular points that are rational over the field of definition, and the case of nodal projective plane curves. In each case we present, assuming the characteristic is fixed, a polynomial-time algorithm which computes the zeta function the curve, and …
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Analysis and detection of fingerprint creases
… features on the fingerprint, including minutiae points, pores, and singular points, for comparing two fingerprint images. In this work, we explore the possibility of using fingerprint creases for comparing two fingerprints. Creases can be described as white lines or scars on a fingerprint image. …
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Listening with Hands: The Instrumental Impulse and Invisible Transformation in Turntablism
… on the street, reduce this transformation to singular points in history and fail to capture the gradual process embedded within an artistic pursuit. The compositions, performances, installations, and research presented in this thesis are created through an artistic negotiation with the …
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Patterns of electro-magnetic response in topological semi-metals
… and can be read off from the location of the singular points in momentum space and the helicities/chiralities of the singularities. We motivate and derive effective response actions for the 2D and 3D Dirac semi-metals, the Weyl semimetal, the 3D line node semi-metal and the 3D mirror protected …
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Analytic Evolution of Singular Distribution Amplitudes in QCD
… a method of analytic evolution of DAs that have singularities such as nonzero values at the end points of the support region, jumps at some points inside the support region and cusps. We illustrate the method by applying it to the evolution of a flat (constant) DA, antisymmetric flat DA, and then …
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Boundary Properties for Almost-Minimizers of the Relative Perimeter
… little is known when the boundary of A contains singular points such as edges, vertices, cusps, etc. In particular, we prove a boundary Monotonicity Formula, holding under a so-called visibility condition on A at a point x on the boundary of A, and a Vertex-skipping Theorem, valid when n = 3 and …
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Modêlos não lineares do sistema respiratório
… type is proposed, but also the concept of singular points of the types, saddle and unstable focus, to form the limit cycle to explain the behaviour cyclical of the system. Maintaining the characteristics of the original model we define the parameter of the controller, using the nbtion of a …
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Lelong Numbers and Geometric Properties of Upper Level Sets of Currents on Projective Space
… the geometric properties of the sets of highly singular points of the current $T$. Lelong numbers will be the main tool used for determining how singular a point of a current is. For the first main result of this thesis, we let $T$ be a positive closed current of bidimension $(1,1)$ with unit …
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Anti-self-dual fields and manifolds
… with gauge group SU(2). These solutions are singular for flat and Eguchi–Hanson backgrounds, however we find a solution on a co–homogeneity one hyper–Kähler metric with a domain wall, and the solution is regular away from the wall. We then turn to Quaternion–Kähler four–manifolds, which are …
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On two-valued minimal graphs and minimal surfaces arising from the Allen-Cahn equation
… is the possible presence of a large set of singularities. This is exacerbated by the fact that two-valued minimal graphs do not minimise area, unlike their single-valued counterparts. As a consequence the space of surfaces which could arise as weak limits is potentially huge. This includes …
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Leveraging numerical relativity formulations for perturbative analysis: applications to quasinormal modes in general relativity
… of numerical relativity. We analyze the singular points of this equation, and we derive series solutions with coefficients determined by three-term recurrence relations. These allow for the application of Leaver's continued fraction method, leading to the standard Schwarzschild …
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Tracing parametrized optima for inequality constrained nonlinear minimization problems
… is a capability of handling the transition points between segments in a routine way. The algorithm locates the transition points, and finds an active set for the next segment by considering all possible sets of active constraints. The nonoptimal sets are eliminated on the basis of the …
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Analysis and Modeling of Landscape Topography: Statistical Description and Evolution Under Natural and Disturbed Conditions
… of drainage area at regular and non-regular points of the watershed, and the formation of spatially organized ridge and valley patterns.</p><p>We start from the analysis of topographic slopes under natural and accelerated soil erosion. Using large topographic datasets from mountain ranges …