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 263 for “"tangent"”.
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Numerically Generated Tangent Stiffness Matrices for Geometrically Non-Linear Structures
… work involves tedious derivations of analytic tangent stiffness matrices. The major objective of the current work is to develop a numerically generated tangent stiffness matrix that allows for a general and easily implementable solution method. The thesis begins with the definition of the …
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Improving modified cocomo ii artificial neural network using hyperbolic tangent activation function
… Thus, this research proposes Hyperbolic Tangent activation function (Tanh) to be used in the hidden layer of the ANN architecture to produce faster convergence. Back-propagation learning algorithm is applied to the multilayer neural network for training and testing. The proposed …
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Rigid Body Constrained Motion Optimization and Control on Lie Groups and Their Tangent Bundles
<p>Rigid body motion requires formulations where rotational and translational motion are accounted for appropriately. Two Lie groups, the special orthogonal group SO(3) and the space of quaternions H, are commonly used to represent attitude. When considering rigid body pose, that is spacecraft …
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Analytical and Experimental Determination of Buckling Loads of Wood Columns by the Tangent Modulus (Engesser) Theory
Made available in DSpace on 2014-12-04T23:10:57Z (GMT). No. of bitstreams: 1 0025200.pdf: 6771803 bytes, checksum: 89ccd5fd70363c2c2fe51f60cf37f225 (MD5) Previous issue date: 1957
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Preoperative Tibial Plateau Leveling Osteotomy Planning Using the Conventional and Common Tangent Methods: A Cadaveric Study
… leveling osteotomy planning using the common tangent method to the current conventional method and evaluate the effect on tibial translation and patellar ligament angle following rotation of the tibial plateau. Study Design – Cadaveric study. Seven paired canine pelvic limbs. Methods- …
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The Dynamic Character of the Flow Over a 3.5 Caliber Tangent-Ogive Cylinder in Steady and Maneuvering States at High Incidence
… the unsteadiness of the flow over a 3.5 caliber tangent-ogive cylinder at high angles of incidence. The goal of the investigations is to characterize the natural and forced flow unsteadiness, using a variety of experimental tools. In the first investigation, flow data are collected over a …
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Solving Buckling Problems and Computing Critical Points Using the Multigrid Method
The algorithms make use of the eigenmodes of the tangent stiffness operator to create constraints which improve the conditioning of the tangent stiffness operator. The resultant systems are solved using the bordering algorithm and each equation solution is performed using the modified tangent …
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Multifidelity Covariance Estimation Three Ways
… estimator, referred to as the tangent space or log-linear control variate estimator, constructs a multifidelity covariance estimate by appplying linear control variates to sample covariance matrix logarithms, which are symmetric matrices residing in tangent spaces to the SPD …
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Singular behaviour and long time behaviour of mean curvature flow
… and the asymptotic limit is modelled by the tangent flows. The second one is the asymptotic behaviour of the mean curvature flow as time goes to infinity. We will study several problems related to the asymptotic behaviours. The first problem is the partial regularity of the limit. The partial …
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Sensitivity analysis on chaotic dynamical systems by Non-Intrusive Least Squares Shadowing (NILSS)
… dynamical systems. In NILSS, we represent a tangent solution by a linear combination of one inhomogeneous tangent solution and several homogeneous tangent solutions. Next, we solve a least squares problem using this representation; thus, the resulting solution can be used for computing …
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The functorial semantics of Lie theory
… groupoids) and sketch theory. This thesis uses tangent categories to build a bridge between these two lines of research, providing a structural account of Lie algebroids and the Lie functor. To accomplish this, we develop the theory of involution algebroids, which are a tangent-categorical …
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Quantitative Comparison: Equine Genital Tissues Under Uniaxial Loading
… data, stress–strain behavior, and tangent moduli for the penile sheath, vaginal canal, and scrotum, with strain measured in both the CD and longitudinal direction (LD). Findings indicate that vaginal and scrotal tissues exhibit comparable mechanical properties (tangent moduli: …
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Structure of Singular Sets Local to Cylindrical Singularities for Stationary Harmonic Maps and Mean Curvature Flows
… dimension is maximal, and such that the weak tangent map is homotopically non-trivial, and has minimal density amongst singularities of maximal spine dimen- sion. Local to such a singularity we show the singular set is a bi-Hölder continuous homeomorphism of the unit disk of dimension equal to …
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Convergence of complete Ricci-βat manifolds
… arbitrarily far apart, in the case when a tangent cone at inαnity has smooth cross section. The identiαcation map is given as the gradient βow of a solution to an elliptic equation. We use an estimate of Colding-Minicozzi of a functional that measures the distance to the tangent cone. In …
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Ground line moment analysis of body extended 161kV transmission towers
… required for the extension of a single circuit tangent 161kV transmission tower. The parameters were modified and modern criteria used to evaluate the tangent tower with various body extensions. The basis of analysis for the extended lattice towers compared the ground-line moment of the tallest …
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Asymptotic post-buckling analysis by Koiter's method with a general purpose finite element code
… are required. These matrices comprise the tangent stiffness matrix. As EAL uses the modified Newton-Raphson procedure to solve nonlinear structures, it calculates the tangent stiffness. The first and second order incremental stiffnesses are extracted by partial differentiation of the …
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Investigating Hamiltonian dynamics by the method of covariant Lyapunov vectors
… applying this algorithm to compute CLVs. The tangent dynamics of the centre subspace of the H´enon-Heiles system is investigated numerically through the use of CLVs, and we propose a method that improves the accuracy of the centre subspace computed with the G&C algorithm. As another …
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General linear cameras : theory and applications
… The GLC model can then be use to analyze the tangent planes on this manifold. Geometric structures associated with the local GLC model of each tangent plane provide an intuitive physical interpretation of the imaging system, and they are closely related to the caustics of reflected rays. These …
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Kissing the Archimedeans
… will continue to expand until they become tangent to each other. The ratio will be found between the radius of each outer sphere, and the radius of an inner sphere such that each inner sphere's center is the circumcenter of the polyhedron, and the inner sphere is tangent to each outer …
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Aspects of the (0,2)-McKay Correspondence
<p>We study first order deformations of the tangent sheaf of resolutions of Calabi-Yau threefolds that are of the form $\CC^3/\ZZ_r$, focusing</p><p> on the cases where the orbifold has an isolated singularity. We prove a lower bound on the number </p><p>of deformations of the tangent bundle for …
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