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 24 for “"peak pressures"”.
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Peak pressures due to steam bubble collapse-induced water hammer
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1979.
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An investigation into the intramedullary pressure rise during femoral nailing: does the level and type of fracture determine peak pressures during the procedure?
… whether fracture level and complexity affect the peak pressures. The relevance is that certain fracture types or levels that result in the highest pressures can be identified before the operation. Measures could be taken to reduce the intramedullary pressure during the procedure, particularly in …
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Experimental testing of bimetallic and reactive shaped charge liners
… was 56% less than the solid copper liners. Peak pressures for each liner were measured in the containment tube at various depths. Peak pressures were also measured in the blast tank at 203 mm and 368 mm below the base of the liner. The peak pressures of the solid copper liners and the …
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Detailed simulations of bubble-cluster dynamics
… wall or tissue damage is expected to depend upon peak pressures rather than the average pressure that might be computed with a homogeneous model. Here, we simulate the expansion and subsequent collapse of hemispherical clusters of 50 bubbles adjacent to a planar rigid wall and viscous fluids as …
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Frequency Effect on Peak Pressure Coefficients Using the Narrowband Synthesis Random Flow Generator (NSRFG) Method
… fluid dynamics (CFD) have been adopted to study peak pressures produced by wind forces on infrastructure. Once CFD measurements show a good agreement with field measurements and experimental measurements, CFD has the potential to become a cost-effective tool saving time and money. </p> <p>For …
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Pressure versus impulse graph for blast-induced traumatic brain injury and correlation to observable blast injuries
… data on a P-I graph for humans, the reported peak pressures needed to be scaled to humans, impulse values calculated, and impulse values scaled. Peak pressures were scaled using Jean et al.'s method, which accounts for all the structures of the head. Impulse values were estimated in two …
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Modelling the impact of total stress changes on groundwater flow
… These results showed that, as expected, the peak pore water pressure head is proportional to the pile construction rate. A sensitivity analysis, which was carried out by changing hydraulic conductivity of stiff till, revealed that the lower the hydraulic conductivity, the greater the pore …
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Wavelet Analysis of Extreme Wind Loads on Low-Rise Structures
… simulations, cannot be used to simulate pressure peaks. In this work, we show how wavelet analysis and time-scale representation can be used to establish an intermittency factor that characterizes energetic turbulence events in the atmospheric flows. Moreover, we relate these events to the …
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Redesigning experimental equipment for determining peak pressure in a simulated tank car transfer line
… line. To model this phenomenon and predict the peak pressures in such a transfer line, a laboratory setup consisting of a pressurized water storage tank connected to different segments of pipe by ball valves was constructed. By varying parameters including water height within the tank, transfer …
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Biomechanical Responses and Functional Outcomes in Large Animal and Human Surrogate Models of Primary Blast Injury
… was examined. In a frontal blast orientation, peak pressures were shown to be reduced at the forehead and front of the head but increased at the back of the head with the combat helmet. When the headform was rotated 45 degrees about the transverse axis, peak pressures and total impulses were …
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A study of stone fragmentation in shock wave lithotripsy by customizing the acoustic field and waveform shape
… the focal waveform was a shock wave with peak pressures p+ =65±3MPa and p−=−16±2MPa and the −6 dB focal region was 13 mm long and 2 mm wide. The delay for each element was the only control parameter for customizing the acoustic field and waveform shape, which was done with the aim of …
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Development of a constant-volume combustion apparatus for fuels research
… to 180bar was achieved and results showed that peak pressures were repeatable to within 4%. Up to 60 highquality image experiments were achieved in one day without significant fouling of the windows or degradation of the seals. A discrepancy of approximately 15% existed between predicted peak …
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Advanced prototyping of variable impedance prosthetic sockets for trans-tibial amputees : polyjet matrix 3D printing of comfortable prosthetic sockets using digital anatomical data
… a 3D printed socket to achieve lower interface peak pressures over bony protuberances by using anthropomorphic data acquired through surface scanning and magnetic resonance imaging techniques. An inverse linear mathematical transformation spatially maps quantitative measurements (bone tissue …
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The effectiveness of foot orthoses as a treatment for plantar ulceration in leprosy : a study of the efficacy, acceptability, appropriateness and implantation of a podiatric regimen
… resulted in significantly lower sub pedal peak pressures than intervention with leprosy sandals. 2. Implementation and Sustain ability Ulcer assessment data from March 1994 to January 1995 were used to compare the effects of orthoses supplied by the investigator with orthoses supplied by an …
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Metamorphic P-T Path and Multiple Fluid Events During Burial and Exhumation of the Tso Morari UHP Terrane, NW Himalaya
… shaped clockwise P-T path was obtained with a peak pressure of ~28.5 kbar at ~563 °C, followed by a peak temperature of ~613 °C at ~24.5 kbar. The peak pressures predicted by modelling protocols are consistent with the conventional thermobarometry results and petrographic observations from the …
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An experimental study of the human interface with one atmosphere diving suit by appendages
… areas between pilot and appendage as well as peak pressures, dynamic force loading profiles, impulse and work measurements experienced by the pilots across the specific motions performed. An analysis is performed on the force contributions of the hydrodynamic drag acting on the appendage …
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Large Eddy Simulation and Wavelet Analysis of the Flow Field around a Surface Mounted Prism
… (1998) and Tieleman et al. (2002). As for the peak value, the peak value of -2 obtained in the turbulent inflow case two is about 20% smaller than the values measured experimentally by Tieleman et al. (2002). On the other hand, it is stressed that the peak value in the simulations would …
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Wind flow characteristics and their effects on low-rise buildings
… of quantities: single events, e.g., minimum (peak) pressures, and statistics, such as the mean and the rms pressures. The turbulence intensities, reflecting the gust structure and the directional fluctuations of the free-stream wind, might bear significant influences collectively on the …
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Banda Forearc Metamorphic Rocks Accreted to the Australian Continental Margin: Detailed Analysis of the Lolotoi Complex of East Timor
… Geothermobarometric calculations show peak metamorphic temperatures in pelitic rocks range from 530°C to 610°C for garnet-biotite pairs and peak pressures of 5 to 8 kbar for garnet-aluminosilicate-quartz-plagioclase assemblages. Analyses of amphibole in amphibolites yield temperatures …
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Using optical techniques to measure aluminum burning in post-detonation explosive fireballs
… absence of unburned aluminum–almost half of the peak AlO emission measured when unburned aluminum was present. Results show that AlO emission intensity measurements are skewed to higher AlO intensities by high transient temperatures within the first 30 microseconds when the peak AlO emission is …
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