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 71 for “"Peak Pressure"”.
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Peak pressure under the forefoot in classical ballet
… This study determined the differences in the peak pressure distributed under the forefoot in flat foot and in pointe position. Additionally, the study evaluated the affect of the application of gel modalities in the form of a gel sock and gel toe wedges, determining the ability to alleviate …
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Analysis, Simulation and Control of Peak Pressure Loads on Low-Rise Structures
… prism with the objective of reducing extreme pressure coefficients or loads on its surface. In the first part, we use a probabilistic approach to characterize peak loads as measured on a subject house during Hurricane Ivan on 2004. Time series of pressure coefficients collected on the roof of …
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Redesigning experimental equipment for determining peak pressure in a simulated tank car transfer line
… cars, improper order of valve openings can cause pressure surges in the transfer 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 …
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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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Comparison of Paul and Morlet Wavelets for Measuring the Characteristic Scale of Peak Pressure Events on Low-Rise Structures
… a characteristic time scale (duration) of peaks in pressure and velocity data is presented. This methodology is based on the use of the Morlet and Paul wavelets. Detailed descriptions of these wavelets and their implementation procedures are given. The results show that similar time scales …
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The influence of body position and user characteristics on peak skin pressure in elite wheelchair racers
… body position and user characteristics on peak skin pressures in elite wheelchair racers. Additionally, semi structured interviews were conducted to gain insight into participants’ knowledge, history and opinions of pressure-related injuries. 26 individuals with mobility impairments (mean …
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Is the upper quarter Y-Balance test a useful measure to determine upper limb loading response in female competitive gymnasts after upper extremity injury?
… the YBT-UQ and a handstand on a portable pressure mat. As a handstand is a foundational gymnastics skill, it was chosen to identify a gymnast’s ability to weight-bear through each UE. The pressure mat system provided real-time data during the handstand. Limb symmetry index (LSI), a measure …
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Adaptable Design Improvements For Electromagnetic Shock Wave Lithotripters And Techniques For Controlling Cavitation
… correlation was determined between average peak pressure incident on the stone surface and comminution efficiency. It was also noted that for a given stone type, the correlations converged to an average peak pressure threshold for fragmentation, independent of fluid medium in use. The …
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Computation of Hypersonic Flows with Lateral Jets Using k-ω Turbulence Model
… the reattachment region rearward thus decreasing peak pressure and heat transfer to the body. The peak pressure at the flow reattachment point on the blunt body can be reduced by 35.9% for the laminar case and 30.0% for the turbulent case. The heat flux can be reduced by 54.1% for laminar case and …
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Mitral insufficiency due to ruptured chordae tendineae
… catheterization a tall left atrial “v” wave with peak pressure as high as or higher than the peak pressure in the pulmonary artery was constantly found.</p><p> In a patient with mitral insufficiency where the murmur is harsh and accompanied by a thrill in the fourth intercostal space near the left …
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Wind flow characteristics and their effects on low-rise buildings
… are studied in terms of flow characteristics and pressure-generating mechanisms. Major fmdings contribute to understanding the mechanisms of pressure generation and the roles of turbulence and other properties of the incident wind in loading effects. Much of the debate on wind-tunnel simulation …
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Assessment of LS-DYNA and Underwater Shock Analysis (USA) Tools for Modeling Far-Field Underwater Explosion Effects on Ships
… fluid model, which is modeled with acoustic pressure elements. Analysis of the box barge problem results finds that the program USA is a valid tool for modeling the initial shock response of surface ships when cavitation effects are not considered. LS-DYNA models are found to be very …
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Effects of different fuels on a turbocharged, direct injection, spark ignition engine
… air temperature for gasoline decreased the peak pressure, however, knock onset began earlier for the higher temperatures, indicating that end-gas autoignition is more dependent on temperature than pressure. E85's peak pressure sensitivity to spark timing was found to be about 50% lower than …
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Computational modeling of blast-induced traumatic brain injury
… (FHM), was subjected to blasts with incident overpressures of 6 atm and 30 atm and to a 5 m/s lateral impact. Results from the simulations demonstrate that blasts can penetrate the intracranial cavity and generate intracranial pressures that exceed the pressures produced during impact; the results …
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A new standard in testing mattresses for use in x-ray imaging : developing, validating and using a novel method to test x-ray mattresses for pressure ulcer development, radiation dosimetry and image quality
… be constructed in such a way that interface pressure (IP) is minimized, limiting the chance of pressure ulcer formation. Aim For evaluating X-ray imaging table mattresses, this thesis has three aims (1). to develop and validate an anthropomorphic-phantom-based method of assessing X-ray table …
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Investigation of Pulse Detonation Engines: the Effect of Variable Blockage Ratio on the Deflagration to Detonation Transition
… efficient than the typically utilized constant pressure. There have been numerous approaches of achieving detonation through deflagration-to-detonation transition most of which use evenly spaced obstacles with a specified constant blockage ratio to generate turbulence and pressure fluctuations. …
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Knee joint contact stresses : the influence of deformity and muscle activity
… insertions carefully preserved. Custom built pressure transducers (6 per compartment, 0.5 mm thick, 10 mm diameter) were inserted through 2 small, posterior, capsular incisions and placed on the tibial surface and the menisci. The knees were mounted in a loading system which allowed free …
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Design and analysis of axial aspirated compressor stages
The pressure ratio of axial compressor stages can be significantly increased by controlling the development of blade and endwall boundary layers in regions of adverse pressure gradient by means of boundary layer suction. This concept is validated and demonstrated through the design and analysis of …
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ΑΥΤΟΜΑΤΟΣ ΔΙΑΤΗΡΗΣΙΣ ΤΗΣ ΑΡΤΗΡΙΑΚΗΣ ΠΙΕΣΕΩΣ ΔΙ' ΕΛΕΓΧΟΜΕΝΗΣ ΑΡΤΗΡΙΑΚΗΣ ΑΦΑΙΜΑΞΕΩΣ ΕΝΤΟΣ ΚΛΕΙΣΤΟΥ ΑΣΚΟΥ ΜΕΓΑΛΗΣ ΕΝΔΟΤΙΚΟΤΗΤΟΣ
IN THIS WORK THE CONTROL OF HIGH BLOOD PRESSURE IS ATTEMPTED AROUND A PRESENT (TARGET) VALVE BY CONNECTING THE ARTERIA SYSTEM WITH A COMPLEX HIGH COPLIANCE BALLOON. THIS BALLOON COMPRISED OF 12 SIMPLE ONES WAS USED IN 5 ANESTHETIZED DOGS FOR IN VIVO EXPERIMENTS. THE PEAK PRESSURE OF THIS BALLOON …
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Effects of the geometric modifications on the shear layer excitation source in co-axial side branches
… of a coaxial side branch and the resultant peak acoustic pressure and the sound source term. Interestingly, edge geometry modification, specifically edge rounding and chamfering, plays a crucial role in the phasing of the shear layer with the acoustic field, thereby affecting the excitation …
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