Browsing by Subject "Acoustics"
Now showing items 21-40 of 51
-
Flexural Wave Based Acoustofluidic Devices
(2020)Microfluidic technologies, and the subset of devices that integrate acoustics into their designs (known as acoustofluidic devices), present great potential for solving the challenges of the future. One specific subset of ... -
Harmonic Acoustics for Single Cell Manipulation
(2021)Technologies that can manipulate single particles and cells in a high precision, high throughput and contact-free manner have long been motivated by applications in materials science, physics, medicine, and the life sciences. ... -
High Resolution Continuous Active Sonar
(2017)This dissertation presents waveform design and signal processing methods for continuous active sonar (CAS). The work presented focuses on methods for achieving high range, Doppler, and angular resolution, while maintaining ... -
Highly Efficient Wavefront Transformation with Acoustic Metasurfaces
(2020)Metamaterials are artificially engineered materials or structures that exhibit exotic properties that are not found in nature. They have been serving as a primary approach to fully control the behavior of electromagnetic ... -
Highly parallel acoustic assembly of microparticles into well-ordered colloidal crystallites.
(Soft Matter, 2016-01-21)The precise arrangement of microscopic objects is critical to the development of functional materials and ornately patterned surfaces. Here, we present an acoustics-based method for the rapid arrangement of microscopic particles ... -
Identifying Vulnerable Plaques with Acoustic Radiation Force Impulse Imaging
(2014)The rupture of arterial plaques is the most common cause of ischemic complications including stroke, the fourth leading cause of death and number one cause of long term disability in the United States. Unfortunately, because ... -
In vivo visualization of abdominal malignancies with acoustic radiation force elastography.
(Phys Med Biol, 2008-01-07)The utility of acoustic radiation force impulse (ARFI) imaging for real-time visualization of abdominal malignancies was investigated. Nine patients presenting with suspicious masses in the liver (n = 7) or kidney (n = 2) ... -
Injury Detection and Localization in the Spine using Acoustic Emission
(2016)The National Spinal Cord Injury Statistical Center estimates there are 12,500 new cases of spinal cord injury (SCI) in the United States every year (www.nscisc.uab.edu, 2014) and vehicular crashes are the leading cause. ... -
Major and minor music compared to excited and subdued speech.
(J Acoust Soc Am, 2010-01)The affective impact of music arises from a variety of factors, including intensity, tempo, rhythm, and tonal relationships. The emotional coloring evoked by intensity, tempo, and rhythm appears to arise from association ... -
Mechanisms of Stone Fragmentation Produced by Nano Pulse Lithotripsy (NPL)
(2017)Nano Pulse Lithotripter (NPL) is a new technology in intracorporeal lithotripsy. It utilizes a high-voltage spark discharge of about 30-nanosecond duration, released at the tip of a flexible probe under endoscopic guidance, ... -
Mitigating Cochlear Implant Stimulus Pulses Dominated by Reverberant Distortions
(2022)Cochlear implant (CI) users can experience considerable degradations in speech intelligibility in reverberant environments (Kressner et al., 2018). Reverberation occurs when sound reflects off of surfaces in an enclosure, ... -
Modeling of High Frequency Broadband Acoustic Fields Inside Cylindrical Enclosures Using an Energy Intensity Boundary Element Method
(2018)High frequency broadband acoustic fields inside three-dimensional enclosures are modeled through an energy-intensity boundary element method (EIBEM). Derived from first principles, this novel approach uses uncorrelated and ... -
Modeling Specular and Diffuse Reflection Sound Fields in Enclosures with an Energy-Intensity Boundary Element Method
(2011)Steady-state sound fields in enclosures, with specular and diffuse reflection boundaries, are modeled with a first-principle energy-intensity boundary element method using uncorrelated broadband directional sources. The ... -
Monitoring Marine Mammals in Onslow Bay, North Carolina, Using Passive Acoustics
(2011)Passive acoustic monitoring is being used more frequently to examine the occurrence, distribution, and habitat use of cetaceans. Long-term recordings from passive acoustic recorders allow the examination of diel, seasonal, ... -
Multiscale photoacoustic tomography using reversibly switchable bacterial phytochrome as a near-infrared photochromic probe.
(Nat Methods, 2016-01)Photoacoustic tomography (PAT) of genetically encoded probes allows for imaging of targeted biological processes deep in tissues with high spatial resolution; however, high background signals from blood can limit the achievable ... -
Nanosecond Shock Wave-Induced Surface Acoustic Waves and Fracture at Fluid-Solid
(2018)I investigate the generation and propagation characteristics of leaky Rayleigh waves (LRWs) by a spherical shock wave incident on a glass-water boundary both experimentally and numerically. The maximum tensile stress produced ... -
Non-recurrent Wideband Continuous Active Sonar
(2014)The Slow-time Costas or "SLO-CO" Continuous Active Sonar (CAS) waveform shows promise for enabling high range and velocity revisit rates and wideband processing gains while suppressing range ambiguities. SLO-CO is made up ... -
Optimal Passive Sonar Signal Processing Using the Waveguide Invariant
(2019)This dissertation presents optimal signal processing methods and performance analysis for passive, waveguide invariant (WI)-based acoustic source range estimation in shallow water marine environments. The WI, commonly denoted ... -
Passive Ranging of Tonal Sources in Shallow Water Using the Waveguide Invariant
(2017)Shallow water, coastal regions with high volumes of shipping traffic provide an excellent opportunity to passively characterize the ocean acoustic propagation environment. In this paper, a hybrid maximum-likelihood method ... -
Patterns of Song across Natural and Anthropogenic Soundscapes Suggest That White-Crowned Sparrows Minimize Acoustic Masking and Maximize Signal Content.
(PloS one, 2016-01)Soundscapes pose both evolutionarily recent and long-standing sources of selection on acoustic communication. We currently know more about the impact of evolutionarily recent human-generated noise on communication than we ...
