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 83 for “"Source Location"”.
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An experimental method for structural intensity and source location
… examples show the possibility of locating sources and studying the influence of ribs and damping material attached to the plate surface;There have been many studies on structural intensity. This thesis shows that the differences between two commonly used formulations are the assumptions …
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Acoustic emission source location in composite aircraft structures using modal analysis
… work was to develop an Acoustic Emission (AE) source location method suitable for Structural Health Monitoring (SHM) of composite aircraft structures. Therefore useful key signal features and sensor configurations were identified and the proposed method was validated using both artificially …
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Ionospheric Modeling for Hf Radio Source Location From a Single Site
Made available in DSpace on 2014-12-12T20:54:27Z (GMT). No. of bitstreams: 1 7709034.pdf: 9647392 bytes, checksum: d960217af5242abdee18ea53a5019f7d (MD5) Previous issue date: 1976
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AN UNBIASED SOURCE LOCATION ALGORITHM AND PERFORMANCE SURFACE OF ZERO TRACKING ALGORITHMS
… a new zero tracking algorithm to estimate the locations of directional sources in an unbiased manner is presented. The zeros of the system, which correspond to the sources' locations, are updated recursively taking into account the effect of receiver noise. A formula relating the variances of …
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An Investigation of Directional Propagation Effects in High-Frequency Radio Source Location
Made available in DSpace on 2014-12-10T19:07:06Z (GMT). No. of bitstreams: 1 7317113.pdf: 8844103 bytes, checksum: 7d28bc249f3d5e52feedbfca85ae5b3f (MD5) Previous issue date: 1972
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Dual-Use Strain Sensors for Simultaneous Strain Measurement and Acoustic Source Location
… types of devices have been used to locate the sources of AEs from artificial sources, such as Hsu-Nielsen pencil lead break (PLB) tests, or natural sources such as quasi-static fracture or crack propagation. This type of evaluation has significant advantages over other types of damage …
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Effect of Sound Source Location and Spatial Hearing on the Vestibulo-Ocular Reflex (VOR)
… have directly assessed the effect of speaker location on the VOR nor investigated correlations of functional spatial hearing with the VOR. Therefore, the aims of this study were to 1) assess the effect of speaker location on the VOR and 2) investigate if spatial hearing abilities are …
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Quantitative evaluation of rejuvenators to restore embrittlement temperatures in oxidized asphalt mixtures using acoustic emission source location techniques
… this study using acoustic emission analysis and source location techniques. Four asphalt specimens, which have been oven-aged for 36 hours, were tested using the same acoustic emission approach after two, four, six, and eight weeks dwell time after being rejuvenated. Iterative and non-iterative …
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Application of the Method of Least Squares to a Solution of the Matched Field Localization Problem with a Single Hydrophone
… acoustic propagation model for many different source locations. The source location that gives the best match between the predicted time series and the measurement is assumed to be the correct source location. Single hydrophone localization algorithms from the literature are reviewed and a new …
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THE ACCURACY IN LOCATING AN UNDERWATER ACOUSTIC SOURCE WITH THREE SUBMERGED SENSORS
… In this scenario, only the three coordinates of source location are estimated. These variance expressions are derived under conditions where, 1) only the ocean noise is considered; 2) only the sensor perturbations are considered; and 3) the combined effect due to 1) and 2) are considered. The …
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Supermicron-size aerosol particles originating from biomass burning in south-central Africa
… models for three-day back trajectories show a source location in northern Angola for the time periods when large SAPs were observed. FIRMS (Fire Information for Resource Management System) MODIS 6 (Moderate Resolution Imaging Spectroradiometer) active fire maps showed extensive biomass burning …
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Manatee Sound Localization: Performance Abilities, Interaural Level Cues, and Usage of Auditory Evoked Potential Techniques to Determine Sound Conduction Pathways
… means by which Florida manatees determine sound source directionality. An eight-choice discrimination paradigm determined the sound localization abilities of two manatees within a 360° array of speakers. Five conditions were tested including a 3,000 and 200 ms, 95 dB, 0.2-24 kHz signal, a 3,000 …
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Decoding Auditory Motion Direction And Location In hMT+/V5 And Planum Temporale Of Sighted And Blind Individuals
… and how this process differs from auditory sound-source localization. In the first study, we characterized the neural representations of auditory motion within the Planum Temporale (PT), and how motion direction and sound source location are represented within this auditory motion responsive …
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Evaluating the combined use of three-dimensional hydrodynamic modeling and polyethylene passive sampling in the Lower Duwamish Waterway
… of a given surface water body to identify where sources contributing to the measured concentration distribution are most likely located and what mass flux is required to produce the measured concentrations. This evaluation was completed for the Lower Duwamish Waterway (LDW), a salt wedge estuary …
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Analysis of acoustic emission waveforms from fatigue cracks on a steel bridge hanger
… of emissions were collected and classified using source location, strain magnitude, position on strain cycle and uniqueness of waveforms as the primary criteria. A vast majority of AE from the cracks were found to be due to crack face rubbing and the crushing of corrosion products between the …
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Location Privacy In Emerging Network-Based Applications
… attention. In wireless sensor networks, the location of an event source may be subject to unintentional disclosure through traffic analysis by the attacker. In vehicular networks, authentication leaves a trail to tie a driver to a sequence of time and space coordinates. In a cloud-based …
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Wireless Dust Sensor Network for a Feedlot Dust Abatement Study
… the emissions from measured concentrations at a source location and a Gaussian Dispersion Model predicted the concentration at a downwind location. Dust plume modelling showed six low-cost sensors with 20% error resulted in higher accuracy than a single reference sensor.
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Localization of acoustic transients in shallow water environments
… algorithms capable of passively determining the location of a transient source given some broad constraints. In particular, this thesis investigates the effect of the source signal uncertainty on localizer performance. The localization process consists of two parts. First, a time domain …
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Data-driven microphone array shape identification in reverberant environments
… signals, which can be used to ascertain sound source location and allow for source separation. A common assumption with the application of spatial audio algorithms is that these microphone arrays remain in place during the recording. However, there are many scenarios where this is not the case. …
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Tracking sperm whales using passive acoustics and particle filters
… is desirable. This thesis proposes that the source location be modelled as a probability density function and that the source location is estimated as the mean. This is developed into a practical method using particle filters to track sperm whales. Sperm whales are the ideal subject species …
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