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 25 for “"Shockwaves"”.
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The cavitation subharmonic signal : mechanistic source and optimised detection
… acoustic emissions, and confirm that periodic shockwaves mediate the subharmonic signals.<br/><br/>Acoustic detection of broadband, impulsive pressure transients is particularly susceptible to convolution with the frequency response of the detector. Accordingly, a PVdF needle hydrophone was …
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Sonocrystallization and sonofragmentation
… collapse. These collapses generate hot spots and shockwaves. Hot spots have intense local temperatures (~5,000 K) and pressures (~1,000 atm), and a rapid heating and cooling rate (> 1010 K s-1). Shockwaves can induce crystallization, i.e., sonocrystallization, or break existing crystals, i.e., …
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Continuous wave mode locking for the determination of the acoustic nonlinearity parameter B/A
… can be found in numerous fields including shockwaves, bio-chemistry and medicine. Recent studies in the field of biomedical ultrasound have necessitated a simple and accurate means of measuring B/A in vitro.
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Quantifying Plasticity and Temperature in High Velocity Microparticle Impacts
… plastic wave, preventing formation of strong shockwaves and hydrodynamic behavior. The LIPIT has been effectively applied to study phenomena in mechanical behavior, cold spray, and astronomical impacts, all of which will be further investigated in this work. This thesis combines LIPIT …
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A Novel Dual-Imaging Approach for Visualizing Multiphase and Droplet Interactions including Shock-Driven Flows
… Understanding the interactions between shockwaves and droplets that impact on solid surfaces is critical due to the potential to cause significant damage to materials and structures in high-speed flow environments. Studies like these have applications in areas ranging from aerospace …
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High Pressure Hydrodynamic Shock Wave Effects on Tenderness of Early Deboned Broiler Breasts
… treated immediately may require higher pressure shockwaves or delayed treatment. The HSW process can overcome the problem with tenderness associated with early deboning if the breasts are processed after storage thereby providing processors with the option to debone earlier. A third objective was …
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ALT-RIGHT OF THE_DONALD AND AUTHORITARIAN COMMUNISTS ON REDDIT: INTERNET MEMES TO BUILD COMMUNITY
… the person made catgirl art. The ban sent shockwaves through the leftist community on Reddit and generated old faction lines between the authoritarians and anarchists on the left. I include, alongside the memes and discourse of authoritarian communists, an analysis of how authoritarianist …
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An Innovative Design for a Separate Sewer System
… the head loss coefficient and pattern of shockwaves were studied for both manholes (new and conventional), under the same conditions, using independent, dimensionless parameters for each manhole. The new manhole generates higher head losses, about twice the head loss generated in a …
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Stealth dicing characterization, optimization, integration, and operations management for ultra-thin stacked memory dies
… interactions between generated thermal shockwaves and the preceding dislocation layers formed to initiate controlled crack fractures that separate the individual dies from within the interior of the wafer as a method for significant singulation-related defect reduction and die strength …
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Properties of quark gluon plasma at weak and strong coupling
… are illustrated for the example of two colliding shockwaves where fluid is far from equilibrium at early times as well as for any fluid close to equilibrium in which case drag force expressions are obtained analytically.
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Towards Improvement of Numerical Accuracy for Unstructured Grid Flow Solver
… of the schemes in discontinuous regions such as shockwaves.</p>
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Shock wave interaction with a fluid filled cylinder experimental methods
… experiments are done in the blast tube where the shockwaves are produced in the test section. Pure shock wave due to explosives in free field conditions will have a Friedlander wave form which will be artificially generated in 9 inch shock tube. High speed cameras are used for capturing motion of …
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Mechanics of dump truck vibrations in high-impact shovel loading operations
… under gravity. HISLO generates high-frequency shockwaves that cause severe truck vibrations exposing operators to whole body vibrations (WBV). This WBV levels may exceed the recommended International Standards Organization (ISO) limits resulting in longterm lower-back disorders and other health …
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Pulse Sharpening Effects of Thin Film Ferroelectric Transmission Lines
… lines showed that NLTLs are capable of creating shockwaves. Additionally, if the losses are kept sufficiently low, it was shown that voltage gain should be possible. Furthermore, a method of accounting for material dispersion was developed. Results from simulations including material dispersion …
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Bending Of Metallic Thin Foil Via High Energy Pulsed Laser Peening
… a manufacturing process utilizing strong shockwaves induced by high pressuresintroduced to the surface of a target by high energy, pulsed laser beams. It is a non-thermal,non-contact approach that improves the hardness and fatigue life of components byimparting beneficial residual stresses …
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The Design and Implementation of a Supersonic Indraft Tube Wind Tunnel for the Demonstration of Supersonic Flows
… is used to view and measure the angle of oblique shockwaves on a simple wedge test-model. The Indraft Tube Tunnel is novel in the field of high-speed aerodynamic testing, and may be implemented by other universities to produce supersonic flows with a relatively small investment in hardware and …
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Bubbles and crystals: time-resolved sonoluminescence, sonocrystallization, and sonofragmentation
… was shown to be direct interactions between shockwaves and crystals rather than interparticle collisions, a surprising contrast with superficially similar systems. Decoupling and kinetics experiments were performed to rule out particle-particle collisions, particle-horn collisions, or …
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Trailing Edge Aerodynamics: Flow Regimes, Geometry and Loss
… layer deflection. This, in turn, results in shockwaves that can propagate upstream of the trailing edge. When this flow regime occurs, it is known to be the loss dominating mechanism for trailing edge flows. In this dissertation experiments and LES simulations are performed to increase the …
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Ultrasound-assisted synthesis and processing of carbon materials
… erosion and particle fracture occur due to the shockwaves and microjets formed from asymmetric bubble collapse at extended surfaces. The chemical and physical effects of ultrasound have been studied as an adjunct to the traditional chemical pretreatment of lignocellulosic biomass for ethanol …
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Development of nanosecond-gated laser induced breakdown spectroscopy for fuel mole fraction measurements in supersonic combustion
… high dynamic pressure of incoming air and all shockwaves formed by the vehicle forebody or engine inlet geometry compressing the incoming air. Ramjets and scramjets operate on the same principal, but there is one key difference. In a ramjet, the air is decelerated to subsonic speeds in the …
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