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 92 for “"Free Field"”.
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Physical limitations on free-field microphone calibration
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1954.
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Exploring Random Geometry with the Gaussian Free Field
… a curve. In Chapter 2 we introduce the Gaussian free field (GFF), a conformally invariant random surface with a domain-Markov property. We explain how to couple the GFF and an SLEκ process, in particular how a GFF can be unzipped along a reverse SLEκ to produce another GFF. We also look at how …
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Conformal loop ensembles and the Gaussian free field
… mathematical objects, such as the Gaussian free field, the Schramm-Loewner evolution, and the conformal loop ensemble. Just as Brownian motion is a scaling limit of discrete random walks, these objects serve as universal scaling limits of functions or paths associated with the underlying …
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Gaussian free field, Schramm-Loewner evolution and Liouville quantum gravity
Consider an instance h of the Gaussian free field on a simply connected domain ... We study several properties of the level lines: continuity, monotonicity, reversibility and target-independence ... In the second part, we study Liouville quantum gravity(LQG).
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Free-field reciprocity calibration of condenser microphones in the low ultrasonic frequency range
… the development of a measurement set-up for the free-field calibration of 1/4-inch condenser microphones by the reciprocity method, and enables traceable measurements of the free-field sensitivity of condenser microphones in the low ultrasonic frequency range from 20 kHz to 160 kHz. A new, fully …
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Optimization of Control Source and Error Sensor Locations in Free Field Active Noise Control
… techniques have been used to find optimal near field error sensor locations. When there is little obstruction to the flow field of the fan, minimal airflow is found along the near field null that is created by minimizing the sound power of the system. Surface mounting of the error sensors can …
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Error Sensor Strategies for Active Noise Control and Active Acoustic Equalization in a Free Field
… determine how to appropriately control a sound field. These include pressure, particle velocity, energy density and intensity. In this thesis, numerical models are used to show which signals perform best in is free-field active noise control (ANC) using error sensors located in the near field of …
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The Effect of Container Boundaries on The Free-Field Behavior of Dense Sand When Subjected to Shock Loading
Made available in DSpace on 2014-12-08T23:56:49Z (GMT). No. of bitstreams: 1 6706762.pdf: 4276002 bytes, checksum: e2f7a9bf3ea198f336f9598924eac922 (MD5) Previous issue date: 1966
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Survey of free-field methods to measure the normal specific acoustic impedance of ground surfaces in situ at low frequencies
Several techniques for measuring the normal specific acoustic impedance of the ground in situ and at low frequencies are examined. These techniques include the use of a spherical wave model, plane wave model, boundary conditions method, and the ANSI S1.18-2010 standard. Experiments are performed …
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Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children
… to our local conditions. In this study, a free-field live voice test was developed based on three levels: whisper, conversational and loud. This was evaluated against pure tone audiometry for sensitivity, specificity, cost and ease of application in two studies: hospital and school- based. …
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Numerical simulations of site response and seismic settlements at Kashiwazaki-Kariwa Nuclear Power Plant, Japan
… were observed in dry sand deposits at both the free-field site and around the power plant structure components. These total and differential settlements were reported to be the main reasons for water and oil leakage, which eventually led to flooding and fire. This study focuses on …
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Quantifying communication device vulnerabilities: assessing energy requirements through front door and back door coupling
… electronic devices through direct injection, free-field, and back door coupling. For the direct injection setup, the Device Under Test (DUT) was placed and subjected to an HPEM signal through the use of a series of cables and equipment in a bench top setup. For the free-field and back door …
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Extreme values of non-Gaussian fields
… it is known for the lattice discrete Gaussian free field (DGFF) in $d=2$ as well as for general log-correlated Gaussian fields, that the limiting law of the centred maximum is a randomly shifted Gumbel distribution. While for Gaussian fields the picture is rather complete, many difficulties …
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1-g Shake Table Experimental Evaluation of Building Settlements Founded on Liquefiable Soils
… are based on semi-empirical relationships for free-field conditions and do not consider external loadings from structures. However, field observations have noted that liquefaction settlement from buildings can be considerably greater than the semi-empirical estimations. The controlling …
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Indices for Supersymmetric Quantum Field Theories in Four Dimensions
… electric-magnetic duality in supersymmetric field theories. In the first chapter, we first define the index and underline its cohomological nature, before giving a first computation based on representation theory of free superconformal field theories. After listing all representations of the …
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Scale Model Shake Table Testing of Underground Structures in Soft Clay
… for close approximation of one-dimensional (1D) free-field site response by significantly limiting the rigidity of the boundary conditions and allowing the soil to deform under simple shear. The study was conducted over two shake table testing phases: Phase I consisted of shaking a model soil …
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Scaling limit of critical systems in random geometry
… Schramm--Loewner evolutions, the Gaussian free field, Liouville quantum gravity and the Brownian continuum random tree. We begin by considering branching diffusions in a bounded domain $D\subset$ $R^{d}$, in which particles are killed upon hitting the boundary $\partial D$. It is known that …
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Response of continuous pipelines to tunnel induced ground deformations
… analytical solutions for tunnel-induced, free-field ground deformations in a plane orthogonal to the heading (Pinto and Whittle; 2001) with Winkler models for pipe-soil interactions. The free-field ground deformations are described in terms of two parameters describing the modes of cavity …
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Scale Model Shake Table Testing of Shallow Embedded Foundations in Soft Clay
… models, numerical analyses, and limited field data. This research works towards increasing the amount of empirical data through scale model shake table testing. A suite of earthquake time histories is considered in evaluating a nominal 10<sup>th</sup> scale soil-structure model using a …
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