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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 31 for “"Cartesian coordinates"”.
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Mechanical impedance control of robotic manipulators in Cartesian coordinates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Bazinių mašininio mokymo modelių taikymas kvantinės chemijos duomenų analizei /
… of a molecule's ground state energy from its Cartesian coordinates, a task complicated by the need for substantial computational power and precision. The primary objective is to assess the potential application of foundation machine learning models for quantum chemistry problems. The main …
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Decreasing Occlusion and Increasing Explanation in Interactive Visual Knowledge Discovery
… of n-D data in 2-D in a set of Shifted Paired Coordinates (SPC). SPC for n-D data consists of n/2 pairs of Cartesian coordinates that are shifted relative to each other to avoid their overlap. Each n-D point is represented as a directed graph in SPC. It is shown that the FSP method simplifies …
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Spherical ray-tracing
… of spheres and naturally fit into spherical coordinates. When tracing rays through naturally spherical domains (for example, for visualization), converting to Cartesian coordinates introduces aberrations. Therefore, we seek an algorithm to natively cast rays through spherical coordinates, and …
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Analysis and Application of Perfectly Matched Layer Absorbing Boundary Conditions for Computational Aeroacoustics
… perpendicular to a boundary, with an emphasis on Cartesian coordinates. The goal of this work is to further extend the PML methodology in a two-fold manner: First, to handle the more general case of an oblique mean flow, where mean velocities strike the boundary at an arbitrary angle, and second, …
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Nonlinear Dimensionality Reduction for the Thermodynamics of Small Clusters of Particles
… of a cluster is in 3N dimensions, i.e., the Cartesian coordinates of the particles, the ML results demonstrate that sub-spaces of much lower dimension can describe the observed structural motifs. Furthermore, these sub-spaces correlate with meaningful physical variables such as radius of …
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Multi-Domain Coincidence Processing and Memory Architecture for Real-Time Geiger Mode LiDAR
… of approximately 300 with output in the form of Cartesian coordinates, which can be directly integrated into a point cloud data structure for viewing. This promising result warrants further development work on LiDAR system designs incorporating these concepts.
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Design and implementation of multiple user mobile robot following system
… the correct leader. From the distance, the Cartesian coordinates for the robot’s location along the horizontal plane where determined. The produced robot was capable of navigating within a 2m by 2m square area successfully. Possible source of error can be attributing to round of error due to …
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Computational Solutions of the Forward and Adjoint Euler Equations with Application to Duct Aeroacoustics
… in the time domain are formulated for the Cartesian coordinates Analytical solution for adjoint equations is derived by using Green's function in 2D and 3D. The derivation of reciprocal relations is presented for closed and open ducts. The adjoint equations are then solved numerically in …
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Lie group invariant finite-difference schemes for the neutron diffusion equation
… in one-dimensional slab and two-dimensional Cartesian coordinates, for multiple region problems. These invariant difference equations were defined to lie upon a cell edged mesh as opposed to the standard difference equations, which lie upon a cell centered mesh. Results for a variety of …
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Determination of advection and diffusion in a thermohaline staircase region
… 1987), we construct inverse models in both cartesian and density coordinates and seek bounds on the cross isopycnal mixing in the staircase region. In cartesian coordinates, the role of diffusion was not well resolved, probably due to inadequacy of the steady state model in the presence of …
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A Numerical Study of Three-Dimensional Black Hole Spacetimes
… evolutions of vacuum black hole spacetimes in 3D Cartesian coordinates. We first studied the Schwarzschild spacetime, comparing extensively with 1D studies. We show that although accurate 3D evolutions are possible, there are a number of difficulties in evolving 3D black holes, for which we …
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A numerical study of 3D black hole spacetimes
… evolutions of vacuum black hole spacetimes in 3D Cartesian coordinates. We first studied the Schwarzschild spacetime, comparing extensively with lD studies. We show that although accurate 3D evolutions are possible, there are a number of difficulties in evolving 3D black holes, for which we …
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The effect of crystalline orientation and band non-parabolicity on the electronic properties of bismuth nanowires
… a simple method to transform from hexagonal to Cartesian coordinates in the bismuth lattice. We then investigate an important indirect electronic transition in bismuth nanowires, and we use the Lax two-band model to develop a theoretical model for studying the diameter dependence of the energy …
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The rearrangement of cyclopropyl carbenes
… for describing the reaction pathway in terms of cartesian coordinates suitable for use with the computer programme for the CNDO calculations.<br/><br/>The CNDO method was evaluated by determining the barriers to rotation in various cyclopropyl compounds. Reasonably satisfactory values were …
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Constraint preserving boundary conditions for the linearized Einstein equations
… linearization around the Minkowski space-time in Cartesian coordinates of the generalized Einstein-Christoffel system and analyze different kinds of boundary conditions that are designed to ensure that the constraints vanish throughout the computational domain: the Neumann, Dirichlet, and …
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Linear Colour Image Processing in Hypercomplex Algebra guided by Genetic Algorithms
… in form of full quaternions using homogeneous coordinates instead of Euclidean vectors as pure quaternions using Cartesian coordinates. The use of projective geometry provides a much richer set of geometric operations in the colour space compared to the Euclidean geometry. In the proposed …
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Using a ground-based lidar instrument (Echidna ®) to reconstruct three-dimensional forest structure for biophysical and ecological studies
… using apparent reflectance; locates hits in Cartesian coordinates; stores hits as points in a point cloud; and registers five or more overlapping scans into a single point cloud reconstruction. Applying visualization tools, I estimate forest structural parameters that include tree diameter at …
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Phase space and path integral approaches to quantum dynamics
… molecular Hamiltonians in both normal mode and Cartesian coordinates. Despite the simplicity of this method, there can be systems which are extremely anharmonic, where the method can be extremely slow to converge when there is no obviously good starting point. To overcome this problem, we …
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Wheel Speed Distribution Control and its Effect on Vehicle
… model has been developed using the novel Cartesian Geometric Translation (CGf) technique which employs geometry, trigonometry, Cartesian coordinates and finite difference approximation in the time domain to facilitate development of high speed models. The model has been built using the …
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