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 30 for “"Principal axes"”.
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Internal Structure of an Electronics Achievement Test Examined by a Principal Axes Analysis and a Homogeneous Clustering Technique
Made available in DSpace on 2014-12-04T17:32:54Z (GMT). No. of bitstreams: 1 0009144.pdf: 6322207 bytes, checksum: f1d5bc91a75eac8f323c5d2912bda0b5 (MD5) Previous issue date: 1954
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Photo-induced birefringence in single-mode optical fiber
… permanent photo-induced rotation of the principal axes of birefringence in Ge-doped circular-core low-birefringence single-mode optical fiber. Light from a linearly polarized Ar⁺ laser at a wavelength of 488 nm was launched into the fiber along one of the principal axes of the initial …
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Formability of Sheet Metal Under Non-Coaxial and Zig Zag Strain Paths
… other words, during the forming operation, the principal axes of stress and strain coincide with each other and are fixed with respect to the material. The directions of the principal axes are along the meridional tangential and the circumferential directions all the time during the forming …
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Static and Dynamic Response of Helically Curved Thin-Walled Girders
… a doubly symmetric, open cross-section with principal axes oriented in the directions of the normal and binormal vectors to the helical curve described by the cross-section center of gravity.
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Distributed Pressure and Temperature Sensing Based on Stimulated Brillouin Scattering
… When a pressure is applied on the fiber, the two principal axes of the fiber birefringence yield different Brillouin frequency shifts in the Brillouin scattering. The differential Brillouin scattering continuously along the fiber thus permits distributed pressure measurement. Our sensor system was …
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An Analysis of Rigid Image Alignment Computer Vision Algorithms
… two rigid image alignment algorithms, namely the Principal Axes algorithm and the Fast Fourier Transform (FFT) based phase correlation algorithm. The software for registering images using these two methods is written in MATLAB R2011a. We also compared our results with alignments achieved for the …
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Computer vision-based localization and mapping of an unknown, uncooperative and spinning target for spacecraft proximity operations
… the target object as well as its center of mass, principal axes of inertia and its inertia matrix. This information is essential to being able to propagate the state of the target object to a future time, which is a key capability for any type of proximity operations mission. Most of the typical …
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Analysis of a hyperbolic paraboloid
… of different curvatures and from sections with principal axes rotated or translated, the Hyperbolic Paraboloid has become a popular form for roof shells. In this thesis a comprehensive method was presented for the analysis of a hyperbolic paraboloid surface with curved edges. Its reliability is …
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An Analysis of W-fibers and W-type Fiber Polarizers
… is linearly polarized along one of the fiber's principal axes. Some of the polarizer properties can be understood from the study of W-fibers.
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The properties of single crystal sapphire fibers and the polarimetric optical sensor for high temperature measurements
… polarized light launched along one of the principal axes of the birefringence can be partially maintained. The polarization-maintaining ability (PMA) has been measured to be 6 dB and 3 dB for 7 cm and 32 cm long sapphire fibers, respectively. The temperature coefficient of the differential …
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The effect of random internal motions on the angular orientation of a free body with limit control
… spacecraft, the angular changes about the three principal axes of inertia can be considered independent. The additive effect of many motions, considered random in frequency and magnitude, is found by treating the motion as a form of random walk. Solutions are obtained for the time required to …
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Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes
… two-octave frequency coverage exists along the principal axes. The star spiral antenna was developed to eliminate the performance gap in the WAVES array. The star spiral is a type of slow-wave spiral that also offers array-packing advantages, particularly for the WAVES array. The size reduction …
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Theoretical and Experimental Investigation of Attitude Control for Underactuated Spacecraft
… Then, the use of two reaction wheels along the principal axes of the spacecraft to perform an attitude correction maneuver is studied using quaternion-based nonlinear control (QBNC) and NMPC. Finally, an air-bearing testbed with a floating satellite simulator that closely mimics the dynamics of …
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On-orbit inspection of a rotating object using a moving observer
… targets through constrained optimization of principal axes orientation and inertia ratios. Firstly, finite differencing of orientation estimates from trajectory estimation and mapping is used to determine the polhode of the target object. Estimation of the principal axes is performed by …
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Non-invasive system identification of a tactical generator
… stator, so as to determine the location of the principal axes (d and q axes) of the rotor and impedances of the synchronous machine as seen in the d-q reference frame. Least-squares curve fitting is applied to the Bode plots of these impedances to fit the predictions of equivalent circuit models …
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The Orbital Structure of Galaxies and Dark Matter Halos in N-Body Simulations
… such as its triaxiality or the ratios of its principal axes. We are deriving a global occupation probability for self-consistent triaxial galaxies which are in agreement with theoretical expectations. Furthermore we find that the isophotal structure of the merger remnants cannot be explained …
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A Revisitation of the WISC-R Factor Structure with Adequate Sample Size, Systematic Control of Both IQ and Age Ranges, and the Use of Procedures to Limit Overfactorization
… were performed on the WISC-R scale scores. Principal Axes Factor method with squared multiple Rs in the diagonals was used. Oblimin was the rotation of choice. Sample size varied for each analysis, the largest being 3,493; and the smallest, 225.</p> <p>Results. At the broad IQ ranges a …
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Equilibria of a Gyrostat with a Discrete Damper
… conditions for simple spins about the nominal principal axes. We use analytical and numerical methods to explore system equilibria, including the bifurcations that occur for varying system parameters for varying rotor momentum and damper parameters. The equations and bifurcations for zero rotor …
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[mu]SR measurement of the magnetic penetration depth and coherence length in the high-T superconductor YBa₂Cu₃O₆ 95
… is not parallel to one of the superconductor's principal axes, an attractive force between vortices along one direction arises when the superconductor is cooled in a constant and low field. When the net intervortex repulsion exceeds the forces pinning the vortices in place, the aspect ratio of …
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Systematic Investigation of Intermolecular Interactions in NEXAFS Spectroscopy
… horizontal polarization was aligned along the principal axes (X,Y) of individual crystals. In addition to the observed linear dichroism, the room temperature NEXAFS spectra of orthorhombic alkanes becomes broader as the alkane chain length decreased. This broadening of NEXAFS spectra is …
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