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Showing 1 to 18 of 18 for “"Wave physics"”.
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Applications of deep learning for gravitational wave physics
Multi-messenger Astrophysics is an emerging multidisciplinary field that demands fast data analysis. On the other hand, deep learning has greatly accelerated signal processing in many fields without sacrificing performance. This work shows that deep learning can be deployed for efficient binary …
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From Measure Zero to Measure Hero: Periodic Kerr Orbits and Gravitational Wave Physics
A direct observational detection of gravitational waves - perhaps the most fundamental prediction of a theory of curved spacetime - looms close at hand. Stellar mass compact objects spiraling into supermassive black holes have received particular attention as sources of gravitational waves …
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Studies of ICRF mode conversion with phase contrast imaging and full-wave simulations in Alcator C-Mod
Radio frequency (rf) waves in the ion cyclotron range of frequencies (ICRF) are widely used for heating fusion plasmas. In a multi-ion-species plasma, the launched fast waves convert to ion cyclotron waves and ion Bernstein waves in the vicinity of the two-ion hybrid resonance between the cyclotron …
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Computation of multiscale time-harmonic electromagnetic radiation
… hybrid solvers. The source antenna (with both subwavelength-scale and wavelength-scale features) is modeled with the electric field integral equation (EFIE), and it interfaces with the installation site using the equivalence principle algorithm (EPA) as a domain decomposition method (DDM). The use …
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The diffraction of monsters from complex apertures
… understanding the way incoming electromagnetic waves are diffracted by various different types of scattering screens. These classes of problem are fundamental in the laser optics community, and within the arena of wave physics more generally. They are also of potential interest to applied …
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Gravitational collapse, compact objects and gravitational waves in General Relativity and modified gravity
… status GW150914, the first gravitational wave signal from the inspiral and merger of two black holes was detected. The following consistent detections (9 further black hole binaries and one neutron star system) and the introduction of the European interferometer Virgo, as well as other …
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Computational Bayesian techniques applied to cosmology
… work around 3 themes: dark energy, gravitational waves and Bayesian inference. Both dark energy and gravitational wave physics are not yet well constrained. They present interesting challenges for Bayesian inference, which attempts to quantify our knowledge of the universe given our astrophysical …
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Reciprocity and Normality in the Scattering Matrix of Disordered Media
… provides a practical characterization of wave transport in linear, source-free systems by relating a set of operationally defined input and output spatial channels. The matrix is structured as a block operator, with diagonal blocks encoding same-side reflection matrices (RMs) and …
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Full-wave modeling of lower hybrid waves on Alcator C-Mod
… on several aspects of the Lower Hybrid (LH) wave physics, the common theme being the development of full-wave simulation codes based on Finite Element Methods (FEM) used in support of experiments carried out on the Alcator C-Mod tokamak. In particular, two non-linear problems have been …
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Teleseismic transmission and reflection tomography
… the data considered, and the approximations to wave propagation that connect the two. This thesis will consider three divergent approaches to seismic tomography spanning different representations of Earth structure at different scales, using different parts of the teleseismic wavefield, and …
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Elastic time-reverse imaging and transmission tomography for microseismic and DAS VSP data
Wavefield migration and tomography are considered to be state-of-the-art methodologies used for subsurface geological characterization. Seismic tomography produces accurate velocity models that commonly serve as input into seismic migration algorithms that produce high-quality passive-source (e.g., …
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Computer basiertes Lernprogramm über die physikalisch-technischen Grundlagen der Sonografie beim Kleintier
… explanation of theoretical conditions of sound wave physics by the use of images in moving form. For that reason the physical principles are shown in colourful animated graphs. The real conditions are demonstrated by different original ultrasound sequences. The layout and the design of the …
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Information Processing for Biological Signals: Application to Laser Doppler Vibrometry
… Modeling these signals using the underlying physics may not be accurate due to the inherent complexities of the human body. The appropriate use of such models depends on the application of interest. Models developed in this dissertation are motivated by underlying physiology and physics, and …
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Development of optomechanofluidic resonators
… driving the resonator with continuous-wave light and observing the response of the system with a single evanescently-coupled tapered optical fibre is employed. This hybrid dual-resonant system consisting of an OMFR shell and contained fluid can be considered a radiation-pressure driven …
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Simultaneous multi-angle measurements of plasma turblence at HAARP
<p>We report the results from a recent series of experiments employing the HAARP HF transmitter to generate and study strong Langmuir turbulence (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super …
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Topics in diffuse field ultrasonics
Random wave fields that have explored large volumes over long times contain much information. Studying these diffuse fields and extracting the information contained in them are the primary aims of Diffuse Field Theory. When the waves of interest are elastic waves at frequencies above 20kHz, the …
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Exploring fundamental physics with gravitational waves
… several topics in the field of gravitational wave astronomy. By means of introduction, I review the historical evolution of humanity's understanding of the mechanics of gravity, and the events which eventually led to the first ever detection of gravitational waves in 2015. The first half of …