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 56 for “"Ellipsoids"”.
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Computing minimum-volume enclosing ellipsoids
A Minimum-Volume Enclosing Ellipsoid (MVEE) is a useful tool for summarizing or representing a large, multidimensional data set (point cloud) by a convex body. MVEEs find applications in areas as diverse as computational geometry, data analysis, and optimal design. The cost of an iterative …
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Estimation of dynamically evolving ellipsoids with applications to cardiac imaging
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Two-sample ellipsoidal bounding in the context of parameter estimation
… These involve the examination of families of ellipsoids containing the intersection of several strips and an ellipsoid, and then choosing the family-optimal ellipsoid (in general, not the BLJ ellipsoid for the intersection of the strips and the ellipsoid). The resulting ellipsoids are often …
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Coffee-Rings and Glasses: Colloids Out of Equilibrium
… shape from isotropic spheres to very anisotropic ellipsoids. For sessile drops, i.e., drops sitting on a solid surface, spheres are deposited in a ring-like stain, while ellipsoids are deposited uniformly. We also confined drops between glass plates and allowed them to evaporate. During …
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Synthesis and Application of Well-Defined Stimuli Responsive Materials
… These latex particles were transformed to ellipsoids in response to irradiation by linearly polarized light perpendicular to the sample surface.
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Identification of Fold Hinge Migration in Natural Deformation: A New Technique Using Grain Shape Fabric Analysis
… and magnitude of the final grain shape fabric ellipsoids. Flexural folding and passive-shear folding models predict that the highest finite strains will be recorded in the hinge of a fold. The highest grain shape magnitudes recorded in the North Carolina fold, however, lie along the overturned …
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ΜΕΛΕΤΗ ΤΗΣ ΔΟΜΗΣ ΣΤΑΤΙΣΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΤΟΥ ΕΛΛΗΝΙΚΟΥ ΔΙΚΤΥΟΥ ΠΡΩΤΗΣ ΤΑΞΗΣ
… USING DIFFERENT OBSERVATION MODELS. BEST FITTING ELLIPSOIDS ARE DETERMINED FOR A READJUSTMENT OF THE NETWORK WITH LESS DISTORTIONS WHICH ARE PRESENT IN THE CASE OF REDUCTION ONTO A NON BEST FITTING REFERENCE SURFACE. RELATED TOPICS ARE ALSO TREATED, E.G., THE DETERMINATION OF THE DATUM; REDUCTION …
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Parameterization of the Gay-Berne coarse-grained potential from atomistically detailed anisotropic free energy volumes
… in a reduced form as either regular spheroids (ellipsoids) or as continuum models, using specialized interaction potentials. The Gay-Berne is a one such coarse-grain potential, which has been particularly successful in that it has been used in modelling of liquid crystals, protein dynamics and …
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A method for replicating ice accretion roughness using multi-scale analog distributions.
… distributions of deterministic roughness, one of ellipsoids and one of elliptical cones, were created to match the primary features of the real ice surface. This work describes the analog surface creation method and characterizes the convective enhancement and velocity boundary layer development …
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Debris Propagation due to a Space Vehicle Breakup at High Altitudes
… over time. The concept of positional probability ellipsoids is employed for the visualization of the results. Through a case study, it is shown that while the results of the covariance propagation method are in close agreement with those of the Monte Carlo method, the covariance propagation method …
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Computational Study of the Effect of Interparticle Contact in Conductive Properties of Random Particulate Systems
… of randomly-dispersed, equal-sized, deformable ellipsoids are modeled in this study. The steady-state conduction analysis along with a finite element analysis are performed to evaluate the electrical or thermal conductivity for the mechanical contact system. To represent more realistic material …
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Person tracking in 3D using Kalman filtering in single and multiple camera environments
… monitoring the scene. Targets are modelled as ellipsoids and their colour information is parameterised by RGB-height histograms. Observations used to update the target models are generated by matching the targets in the different views. 3-D tracking requires that cameras are calibrated to the …
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Resolution of grain scale interactions using the Discrete Element Method
… of the formation of heaps using spheres and ellipsoids both validates the ellipsoid representation and illustrates shape-induced behavioral differences. Resolution of shape is extended by a new algorithm for a hierarchical, multi-scale representation of convex particle surface …
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Simultaneous extraction of order parameters and orientational distribution fuctions from 31[superscript]P NMR spectra of magnetically partially oriented phospholipid bilayers
… shape of the distorted vesicles are examined. Ellipsoids of rotation with a semiaxis ratio of about 1.14 are found to provide a good approximation of the shape of the distorted vesicles. This is in reasonable agreement with published experimental work. All three models yield clearly …
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Fabrication and characterization of novel nanostructures based on block copolymer lithography
… approaches to generate novel structures such as ellipsoids, rings or square array of dots: diblock copolymers templating and triblock terpolymers. Without templating, diblock copolymer can only form spheres, cylinders, or lamellae typically. Triblock terpolymers, on the other hand, can form a …
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Time-delay systems : stability, sliding mode control and state estimation
… to minimise the projection distances of the ellipsoids on axes, with respect to various convergence rates, instead of minimising its radius with a single exponential rate. Therefore, the smallest possible bound can be obtained from the intersection of these ellipsoids. This study also …
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Statistical Analysis of Longitudinal and Multivariate Discrete Data
… coverage probabilities of the confidence ellipsoids, and asymptotic relative efficiencies as the criteria.</p> <p>The second part of this dissertation is devoted to the study of fully specified models constructed using copulas, with special emphasis on the normal copula. Finding the …
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Proper holomorphic mappings of positive codimension in several complex variables
… certain other target domains, e.g., generalized ellipsoids $\rm\{\sum\sb{j}\ \vert w\sb{j}\vert\sp{2m\sb j}< 1\}$ in $\rm C\sp{N}.$
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