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 71 for “"ellipticity"”.
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Development of a numerical method to solve the three-dimensional compressible laminar boundary-layer equations with application to elliptical cones at angle of attack
… vertical half-angle elliptical cones of varying ellipticity ratios at up to 8° angle of attack at a Mach number of 7.95 are presented. Skin friction and heat-transfer-rate distributions are presented for all cases. Good agreement has been found with experiment for the heat-transfer rates on …
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High Frequency Radio Wave Transionospheric Propagation Polarization Studies from the RRI-SuperDARN Experiment
… information (such as orientation angle and ellipticity angle) of the wave. Radio waves were transmitted from the Saskatoon SuperDARN (Super Dual Auroral Radar Network) radar in conjunction with RRI flybys. There have been 88 conjunctions between RRI and SuperDARN over 4 years (2014-2018). …
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The non-sphericity of Triton's atmosphere as evidenced by stellar occultations
… deg. This resulted in a change in the calculated ellipticity and position angle of Triton's half-light ellipse from their originally fitted values of 0.029 ± 0.016 and 70.3 ± 10.1 deg to improved values of 0.033 ± 0.013 and 65.1 ± 8.8 deg. By fixing the separation parameters to independently …
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Compressible Hydrodynamics of Few Body Optical Vortices
… for describing vortex motion. Vortex ellipticity plays a crucial role in vortex dynamics in two-dimensional fluids, particularly during nucleation and annihilation events of oppositely charged vortex pairs. This dissertation presents a novel hydrodynamic theory that accounts for vortex …
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Stellar occultation lightcurve modeling for elliptical occulting bodies
… planet as a three-dimensional body of non-zero ellipticity, and define two ellipses of intersection with the body which dictate the appearance of the lightcurve. These include the visible-limb plane ellipse, which is the observed figure of the body as seen in the sky, and the line-of-sight …
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The Problem of the Earth's Figure: Measurement, Theory, and Evidence in Physical Geodesy
… quantity characterising Earth’s figure: its ellipticity. These conflicts persisted throughout the nineteenth century and complicated the coordination between geodetic models and measurements. Chapter 4 reconstructs how geodesists finally achieved convergent measurements of Earth’s ellipticity …
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Genetic and molecular factors regulating growth and morphology in Senegalese sole (Solea senegalensis)
… and genomic regions associated with body ellipticity (ELL) were investigated. High-ellipticity soles had a higher number of vertebrae, longer vertebral bodies and intervertebral spaces, and absence of skeletal malformations. Females showed a wider ventral region than males, and differences …
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Scattering at threshold in massive wave propagation and ionization
… the transition between Legendrian regularity and ellipticity at infinity for two PDEs, the Schrödinger–Helmholtz equation with an attractive long range potential and the Klein–Gordon equation. In the former case, the transition occurs as the spectral parameter 𝐸 → 0⁺, and thus describes the …
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Boundary-value problems for transversely isotropic hyperelastic solids
… of stability predicated on the notion of strong ellipticity. Expressly, for plane strain, we provide necessary and sufficient conditions for strong ellipticity to hold. The material incorporated in the chapter has been accepted for publication in [42]. In Chapter 3 we study the problem of (plane …
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Theoretical characterisation of spheroidal PbSe/PbS Core/Shell colloidal quantum dot heterostructures
… less so. This thesis investigates the effect of ellipticity on the optoelectronic properties associated with spheroidal NQDs. To this end, a four-band, anisotropic, and radially variant k · p system Hamiltonian is expanded in a planewave basis in order to calculate single-particle eigenenergies …
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Nonlinear Dynamics of solitary and optically-injected spin vertical-cavity lasers
… the evolution of the output polarisation ellipticity, and experimentally the nonlinear dynamics of the light polarisation emitted by the QW spin VCSELs under polarised optical injection. Rich nonlinear dynamics of the optically injected QW spin-VCSEL are reported ranging from polarisation …
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An iterative approach to operators on manifolds with singularities
We establish elements of a new approach to ellipticity and parametrices within operator algebras on manifolds with higher singularities, only based on some general axiomatic requirements on parameter-dependent operators in suitable scales of spaes. The idea is to model an iterative process with new …
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Modeling the affect of dark matter distributions in the Milky Way on the component of the cosmic rays energy spectrum as incident on Earth
… the exact nature of the relationship between the ellipticity of the dark matter profile and the positron spectrum. trajectories for other research designs are made clear as a result of this project.
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On the Continuum-Mechanics of Nematic Elastomers
… derive a necessary and sufficient condition for ellipticity of the equilibrated governing system of equations. In situations where the ellipticity condition fails, we examine the existence of solutions that allow for surface defects. Several example energy densities are considered to study the …
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Some simple explicit results for the elastic dielectric properties and stability of layered composites
… on record the conditions of ordinary and strong ellipticity for elastic dielectrics in full generality.
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A study of the seismic behaviour of geomorphological features using ambient noise measurements
… highly directional particle motion, while ellipticity analysis indicates this motion to be almost linear. This is strong evidence for normal mode vibrational behaviour of the large rock masses. The 1 - 2 Hz resonance peak, on the other hand shows no directivity or linearity of particle …
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Three-field mixed finite element approximations for problems in elasticity
… for stability and uniform convergence include an ellipticity condition and, secondly, a condition that the displacement together with a discrete pressure, suitably defined, constitute a stable Stokes pair. The latter condition implies that the inf-sup condition for the three-field formulation is …
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Interactions between Folate Deficiency and β-Nicotinamide Adenine Dinucleotide Deficiency and Conformational Study of Thymidylate Synthase and its Physiological Relevance
… of both R163K and A191K showed a decreased ellipticity. Upon ligation with dUMP, A191K exhibited a further decrease in ellipticity and showed no apparent response to phosphate. In contrast, the ellipticity of R163K was increased by phosphate and dUMP produced a further increase in …
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Elliptic problems with small parameter
… In the second step, we extend the concept of ellipticity with a small parameter to more general classes of operators. Firstly, we want to compare the difference in asymptotic patterns between the obtained series and expansions for similar differential problems. Therefore we investigate the …
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Polarization control and measurement with meta-optics
… polarization (SOP) parameters azimuth [chi] and ellipticity [epsilon], we observe standard deviations of [sigma]= 1.320 and [sigma]= 0.43' respectively. This work is of potential interest in any application requiring compact, lightweight and low cost polarization dependent optics, polarization …
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