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 32 for “"acoustic cavitation"”.
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Mechanoluminescence and Sonoluminescence From Acoustic Cavitation
… on concentration of the organic and the applied acoustic pressure. At low concentration, the molecular emission bands showed a rotational temperature of ∼280 K with high energy vibrational population, while at higher concentrations and higher acoustic pressure the molecular emission bands …
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Biofilm Removal with Acoustic Cavitation and Lavage
… and replacement of the entire joint. Through acoustic cavitation, it could be possible to remove the biofilm colonies from the infected surface, thus reducing healing time and even eliminating the need to remove and replace the implant. </p><p>In this thesis, biofilm formation was first …
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Sonoluminescence as a probe of acoustic cavitation
… and $\gamma$ (C$\sb{\rm p}$/C$\sb{\rm v}$) on cavitational conditions. As predicted by thermal theories of sonoluminescence, the intensity of excited-state chromium emission decreases with increasing thermal conductivity of the noble gas, and the intensity of sonoluminescence from silicone oil …
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Deep Photoacoustic Imaging and Acoustic Cavitation Mapping in Shockwave Lithotripsy
… used in clinic. However, SWL can produce cavitation in vivo, and the rapid expansion and violent collapse of cavitation bubbles in small blood vessels may result in renal vascular injury. Current imaging modalities used in SWL (e.g., C-arm fluoroscopy and B-mode ultrasound) are not …
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Hydroxyl Radical Production via Acoustic Cavitation in Ultrasonic Humidifier Systems
Ultrasonic humidifiers use sound vibrations at frequencies higher than can be heard by humans (> 20,000 Hz) to generate aerosolized water also have potential for inducing sonochemical reactions for chemicals present in water. This research focuses on examining oxidants formed within ultrasonic …
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Ultrasonic Effervescence: Investigations of the Nucleation and Dynamics of Acoustic Cavitation for Histotripsy-Based Therapies
… acellular homogenate through the generation of acoustic cavitation and is currently being developed for numerous clinical applications. Histotripsy uses high-pressure (>10 MPa), short-duration (<15 cycles) pulses to cause the rapid expansion and collapse of nuclei at the focus resulting in large …
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An experimental investigation of acoustic cavitation as a fragmentation mechanism of molten tin droplets in water.
Thesis. 1976. M.S. cn--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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The sonochemical synthesis of inorganic and biological materials
… The mechanism of sonochemistry involves acoustic cavitation: the formation, growth, and collapse of bubbles in a liquid. New biological and inorganic materials can be synthesized using this unusual high energy source.
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Influence of ultrasonic cavitation treatment on fragmentation and de-agglomeration of primary intermetallics and oxides formed in Al alloys
… grain refinement by utilising the phenomena of acoustic cavitation that leads to fragmentation/de-agglomeration of solid phases, such as primary intemetallics and oxides, formed during solidification of as-cast alloys. Knowledge of the governing mechanisms associated with fragmentation and …
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The cavitation subharmonic signal : mechanistic source and optimised detection
The cavitation subharmonic signal, emitted at frequency values sub-multiple to that of the acoustic driving, is held to be exclusive to the occurrence of driven bubbles within a host medium. Recently, detection of the subharmonic signal has seen a resurgence of interest, particularly for the …
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High-Rate Histotripsy Methods for the Rapid Removal of Soft and Fibrous Tissue
… modality that uses the precise control of acoustic cavitation to disintegrate tissue. Acoustic cavitation is the transient expansion of pre-existing nuclei to dimensions orders of magnitude beyond their original size due to large increases in the tensile (peak-negative) pressure of the …
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Focused Ultrasound Extraction (FUSE) for Formalin-Fixed, Paraffin Embedded (FFPE) DNA Extraction
… tissue. FUSE generates a dense bubble cloud of acoustic cavitation capable of ablating tissue into an acellular lysate. FUSE treatment was applied to de-paraffinized porcine pancreas FFPE scrolls, followed by heated incubation for formaldehyde-induced DNA-protein crosslink reversal. When applied …
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BIOCHEMICAL AND MORPHOLOGIC EFFECTS OF CAVITATION ON NORMAL HUMAN PLATELETS
… of platelets subjected to well-defined vaporous cavitation near a decelerating prosthetic surface. Also examined was the hypothesis that two types of shear stress transients, lytic and sublytic, are responsible for platelet lysis, aggregation and functional impairment which has been observed in …
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First-In-DOg HISTotripsy for Intracranial Tumors Trial: The FIDOHIST Study
… ablation method that emulsifies tissue through acoustic cavitation. The primary objectives of this prospective study were to assess the feasibility and safety of histotripsy to ablate naturally occurring canine brain tumors. Secondary endpoints included characterization of magnetic resonance …
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Biomedical ultrasonics, cavitation, and sonoporation
This thesis treats biomedical ultrasonics, cavitation and sonoporation. Focussed ultrasound surgery can heat tissue to a temperature that causes protein denaturation and coagulative necrosis. For high-resolution focused ultrasound microsurgery, high working frequencies are necessary. We …
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The Exploration and Development of Focused Ultrasound Extraction (FUSE) for the Rapid Release of DNA from Complex Tissue Matrices
… tissue and release DNA through the control of acoustic cavitation. An initial feasibility study demonstrated the potential of FUSE for simple biological tissues, but the use of FUSE for preparing complex tissues has not been explored previously. Understanding the potential of the FUSE …
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Sonocrystallization and sonofragmentation
Acoustic cavitation occurs when ultrasound is applied to a liquid. Bubbles are generated, oscillate, expand and, when specific criteria are met, implosively collapse. These collapses generate hot spots and shockwaves. Hot spots have intense local temperatures (~5,000 K) and pressures (~1,000 atm), …
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Ultrasonic agitation for surface plasmon resonance biosensors
… is slow, particularly for large molecules. Acoustic streaming has been proposed as a solution to overcome the limitation of mixing in surface based biosensing devices.<br/><br/>This thesis reviews the effects of integrating ultrasonic technology into surface-based biosensors. The …
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Investigations of the Tissue Mechanical Properties and Susceptibility to Histotripsy-Induced Tissue Ablation for Intra-Abdominal Organs
… focused ultrasound ablation method that uses acoustic cavitation to mechanically break down tissues [1-8]. Histotripsy is heavily dependent on the mechanical properties of the tissue, allowing it to mechanically ablate tissues of lower mechanical stiffness while preserving the stiffer critical …
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Investigations of Ultrasound-Guided Histotripsy Ablation for Soft Tissue Sarcomas, Osteosarcomas, and Brain Tumors
… focused ultrasound therapy using controlled acoustic cavitation to mechanically disintegrate tissue into an acellular homogenate. Histotripsy applies microsecond-length, high pressure (> 10 MPa) pulses to initiate the rapid expansion and collapse of nuclei in a millimeter-scale focal region, …
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