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 23 for “"rotational velocity"”.
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Development of a Method for Calculating Delta Scuti Rotational Velocities and Hydrogen Beta Color Indices
… spectroscopically. A method for calculating rotational velocity values and Hydrogen-Beta color indices for the stars in the data set with no previously published values is developed, using the stars in the data set brighter than 7th magnitude. Rotational velocity values for four stars with …
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Physiological and biomechanical responses during high intensity upper body exercise
… analysis revealed significant changes in trunk rotational velocity which was greater for 3% vs 4% resistive load (P < 0.05). These data suggest that the biceps brachii is an important contributor to PPO and that resistive load influences kinematic responses. In the second study, participants (n …
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Global momentum confinement times in Alcator C-Mod H- and I- regime plasmas
… x-ray spectrometer system, the toroidal rotation velocity in Alcator C-Mod plasmas is measured and analyzed. At the L-H and L-I transition, there is a co-current movement in the toroidal rotation velocity.The propagation of this rotational velocity from the edge to the core of the torus was …
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Heat Transfer and Flow Measurements in Gas Turbine Engine Can and Annular Combustors
… the swirler, and created a much more uniform rotational velocity distribution. The radial swirler however, produced greater rotational velocity as well as a thicker and higher velocity reverse flow core. Wall heat transfer and temperature measurements were also taken. Peak heat transfer …
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The L- to H-mode transition and momentum confinement in Alcator C-Mod plasmas
… plasmas was measured. The propagation of the rotational velocity from the edge to the core of the plasma column was measured during the L- to H-mode transition. Momentum transport was measured in both Ohmic and ICRF-heated discharges, which produced EDA and ELM-free H-modes. The momentum …
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Optimization of Tapered Deployable Space Structures
… structure from its wrapped state and examine the rotational velocity and beam's oscillatory behavior during deployment. HEEDS MDO, a commercial optimization software, is utilized to conduct the optimization. Design variables will include beam dimensions and taper ratio, as well as material …
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Propellers in yawed flow at low speeds
… at multiple angles of yaw for a constant rotational velocity. Propeller torque, thrust, and the normal force produced from the sideslip angle were all measured. It was observed that at small angles of yaw, the variation in performance was minimal, yet a dramatic increase was witnessed at …
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Predicting and preventing traumatic brain injury: A novel computational approach
… TBI remains challenging in the field. Peak rotational velocity was demonstrated to be correlated to brain strain responses, and hence could potentially serve as a good predictor for brain injury. Brain strain was influenced by impact direction, deceleration and impact loading curve shapes. …
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Industrial rotating kiln simulation
… and the final amount of mixing depended on the rotational velocity, the drum loading, the particle size and the material ratio. The segregation dynamics occurred too fast to be measured. However the final segregated state was measured and depended on the rotational velocity and the differences …
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Rock Drilling with impregnated diamond microbits
… was used to record the power consumption, the rotational velocity, the bit thrust, the torque and the penetration rate. Tests were conducted under set thrust and under set rate of advance conditions to determine the effect of varying the bit pressure, rotational velocity, diamond mesh size and …
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Configuration Validation of a Novel In-Space Propellant Storage and Transfer System
… and transfer. This system takes the advantage of rotational settling to a simple fluid management (FM) system. Specifically, enabling settled fluid transfer and settled pressure control between two tanks. This thesis work focuses on configuration and validation of static and dynamic stability, …
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Probing for optical and HI diffuse gas in MHONGOOSE galaxy UGCA 250
… by its emission-line ratios and its rotational velocity lag with respect to the galactic disk. Similarly, there is a wealth of observational evidence for extraplanar gas in the form of neutral atomic hydrogen (HI) associated with spiral galaxies. The presence of extraplanar hydrogen …
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Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers
… is designed to operate at 2400 rpm. This rotational velocity reduction is incorporated in order to decrease the rotational tip speed thereby preventing the formation of undesirable shocks at the tip. The reference propeller spinning at 2400 rpm achieves a 9 dB reduction in far field OASPL …
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Modelling and control of a floating oscillating water column
… damping caused by the changing turbine rotational velocity by recalculating the turbine damping for each simulation sample and applying it via a feedback loop. The accuracy of the model was validated using experimental data collected during the Components for Ocean Renewable Energy …
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Evaluation of the Protective Capacity of Ice Hockey Goaltender Masks for Three Accident Events using Dynamic Response and Brain Stress and Strain
… resultant linear acceleration, peak resultant rotational acceleration and rotational velocity of the headform were measured. The University College Dublin Brain Trauma Model (UCDBTM) was used to calculate maximum principal strain (MPS) and von Mises stress in the cerebrum. The results …
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Design of a multi-spool, high-speed, counter-rotating aspirated compressor
… to the change in swirl across the blade and the rotational velocity of the blades. Counter-rotation provides for the largest change in swirl across a series of rotors, facilitating the largest pressure ratio. A three-stage, counter-rotating, compressor was designed to take advantage of these …
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Radial parallel plate flow with mechanical agitation
… Both mass flow rate (radial Reynolds number) and rotational velocity of the impeller were found to have significant, independent, effects on heat transfer. The cause of the increase in heat transfer from the blades is from an increase in turbulent mixing.
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The fates of binary companions in Type Ia supernovae within the single-degenerate scenario
… the supernova ejecta. It is found that the kick velocity is also related to the binary separation by a power law, except for the red giant companion, due to the large numerical uncertainty created by the small kick in this case. The power-law index is found to be about $-1.7$ to $-1.9$ for the …
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Comparative biomechanics and functional morphology of latch-mediated spring actuated mandibles in ants
… found in Odontomachus, reaching a mean maximum rotational velocity and acceleration of around 3.7x104 rad/s and 8.5x108 rad/s2, respectively. In contrast, Anochetus horridus and Anochetus emarginatus have slower strikes relative to the other species of Anochetus and Odontomachus, reaching mean …
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The Effects of A Medicine Ball Training Program on Bat Velocity of Prepubescent Softball Players
Rotational movements are considered an important component of hitting mechanics within the game of softball. Strength and conditioning coaches seek to improve the performance of softball players’ bat velocity through various weighted implement training modes focusing on rotational movements. …
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