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 95 for “"ellipse"”.
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Characterizing Hydrodynamic Interactions of Underwater Vehicles in Close Proximity Using an Identical Ellipse Pair
… interactions between two identical 6:1 ellipses in close proximity were investigated using a 2D immersed interface method simulator in a viscous, rotational flow at Re=1500. Interactions in tandem, side-by-side, and staggered arrangements were characterized based on changes to the drag, …
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Dynamics and Equilibria of N Point Charges on a 2D Ellipse or a 3D Ellipsoid
… distribution is intuitively obvious) and ellipses. We then generalize the approach to the three dimensional case of an ellipsoid. The method we use is to begin with a random distribution of charges on the surface and allow each point charge to move tangentially to the surface due to the …
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Human Interaction with Various Elliptical Constraints
… as a previous crank-turning study; the aligned ellipse was based on estimates of the zero-force trajectory during circular crank-turning; the anti-aligned ellipse was a rotated version of the aligned ellipse. Subjects were given visual feedback on their velocity to decrease variability across …
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Wire detection using ground penetrating radar using image processing techniques
… The second and third approaches propose an ellipse fitting technique to detect surface-laid and shallowly buried wires. After filtering and edge detection in the cross-section image, ellipse fitting is applied to obtain an ellipse feature for indicating how well the shape fits to an ellipse. …
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Host Specificity of Freshwater Mussels: a Critical Factor in Conservation
… host compatibility in two populations of the ellipse mussel in the Spring River and Gasconade River in southern Missouri. Preliminary tests confirmed that orangethroat and rainbow darters from the Gasconade River were suitable hosts for the Gasconade River ellipse mussel (38% and 43% …
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Investigation of the Failure Mechanisms of Intact and Deteriorated Culverts
… scale test was conducted on an intact horizontal ellipse culvert to understand the behaviour of these structures during backfilling and live loading. The horizontal ellipse culvert was tested at two different burial depths (0.9 m and 0.45 m) using tandem axle loading. The results suggest that the …
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Activity segmentation with special emphasis on sit-to-stand analysis
… of a human body in vowel space as well as ellipse fitting algorithms and image features to capture orientation of the body. Fuzzy clustering methods such as the Gustafson vessel algorithm are also investigated. The proposed algorithms were tested on 9 subjects with ages ranging from 18 to …
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The effects of balance training on dynamic balance capabilities in the elite Australian rules footballer
… COP ML path SD (0.843) and COP 95% confidence ellipse area (0.852). Results of the training study found a significant reduction in measures of centre of pressure sway after 10 weeks and 44 weeks: COP 95% confidence ellipse area (p=0.00), Mean COP ML displacement (p=0.01), COP displacement …
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Poncelet polygons through the lenses of orthogonal polynomials on the unit circle, finite Blaschke products, and numerical ranges.
… intersection of the family of polygons) is an ellipse. We will give necessary and sufficient conditions in terms of the constructions of these families of n-gons for small n for which the inscribed curve is an ellipse. We will also provide algorithms for constructing such families of polygons …
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Stress relaxation of AZ31 alloy using high energy diffraction microscopy
… individual peak dynamics and reflection-wise ellipse-fitting strain time series. Peaks of crystallographic planes having a normal roughly parallel to the tensile axis are tracked and the relative plane distances calculated from radial displacements. Generally speaking, grains not favorably …
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The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material
… than the matrix), shapes (hexagon, diamond, ellipse), and relative pair orientations (bridging angle). In addition, single ellipse inclusions were tested to investigate the cracking behavior associated with an ellipse inclusion in a brittle material. Similar to previous research regarding the …
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Machine-Vision-Based Pose Estimation System Using Sensor Fusion for Autonomous Satellite Grappling
… projection of a circle on the image plane is an ellipse, an ellipse detection system is used to find the 3D-coordinates of the center of the interface ring and its normal vector using its corresponding detected ellipse on the image plane. The sensor and data fusion is performed in two steps. In …
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Optimum Semi-Iterative Methods for the Solution of Any Linear Algebraic System With a Square Matrix
… Chebyshev polynomial and depend upon an ellipse enclosing the spectrum of the system matrix.
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Numerical simulation and control of a fluid structure interaction for a plate in a transverse flow
… implies approximating the flat plate by a thin ellipse. The simulation for a fixed plate has been completed with a plate approximated by a 20:1 ellipse and placed in an inviscid flow. A comparison with an image method is also undertaken. The results show encouraging features for modelling the …
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Analysis and interpretation of tidal currents in the coastal boundary layer
… to the semidiurnal and diurnal tides. The tidal ellipses, show considerable vertical structure. Near-surface tidal ellipses rotate in the clockwise direction for semidiurnal and diurnal tides, while near-bottom ellipses rotate in the counterclockwise direction for the semidiurnal tide. The angle …
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Chebyshev-like polynomials, conic distribution of roots, and continued fractions
… by the study of geometric properties of the ellipse and conversely. This includes the following; Chebyshev points lie on certain ellipses centered at the origin, and conversely, every such ellipse contains infinitely many sets of Chebyshev points. In special cases, the products of all …
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Analysis and interpretation of tidal currents in the coastal boundary layer
… to the semidiurnal and diurnal tides. The tidal ellipses, show considerable vertical structure. Near-surface tidal ellipses rotate in the clockwise direction for semidiurnal and diurnal tides, while near-bottom ellipses rotate in the counterclockwise direction for the semidiurnal tide. The angle …
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3D ENDOSCOPY VIDEO GENERATED USING DEPTH INFERENCE: CONVERTING 2D TO 3D
… map these ridge-like structures into concentric ellipses with their common center at the darkest spot. Then, these two observations are used to infer the depth of the endoscopy videos; which then serves to convert them from 2D to 3D. The processing time is between 21 seconds to 20 minutes for …
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Implementation of a High-speed Sinusoidal Encoder Interpolation System
… gain and offset measurement errors based on ellipse-fitting techniques.
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Geometria finsler e incêndios florestais.
… terrain and the contribution of wind, where the ellipse now coincides with the indicatrix of a Finsler metric. Finally, the behavior of the fire is modeled by a system of ODEs, or alternatively, the application of fire is also characterized by a system of PDEs with certain orthogonality …
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