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.
Results
Showing 1 to 20 of 32 for “"linear velocity"”.
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Trackable Features Provide a Cue to the Angular Velocity of Rotating Objects
… on the object moves with an instantaneous linear velocity dependent upon its distance from the center of rotation, while the object as a whole rotates with a fixed angular velocity. Does the perceived rotational speed of an object correspond to its angular velocity, linear velocities, or …
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Simulations of dark energy cosmologies
… of the Universe. In this thesis we study the nonlinear growth of cosmic structure in different dark energy models, using ultra-large volume N-body simulations. We measure key observables such as the growth of large scale structure, the halo mass function and baryonic acoustic oscillations. We …
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Experimental Studies in Temperature Programmed Gas Chromatography
… effects was made by studying column length and linear velocity in conjunction with temperature programming rates. Experimental determinations using a combination of three different column lengths, five linear velocities and three ramping rates on a three-component sample were investigated. A …
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The effects of carrier gas viscosity on column efficiency in capillary gas chromatography
… in viscosity results in a decrease in the linear velocity of the carrier gas, ultimately resulting in lower column efficiency.
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Electromechanics and electrorheology of fluid flow with internal micro-particle electrorotation
… the physical aspects of mass conservation, linear momentum balance, angular momentum balance, and electro-quasi-static field of the negative electrorheological fluid flow. A "rotating coffee cup model" is also developed for the first time to derive the retarding polarization relaxation …
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An analytic evaluation of the upper break frequency of the human otolith organ
… a problem which, when subjected to a change in linear velocity, is analogous to Stokes' impulsive plate problem. The displacement of this"elasticity-independent" impulsive plate problem is compared with that predicted by the lumped parameter model when subjected to the same input. The solution …
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Spectroscopic Study of Compressible Mobile Phase and Stationary Phase Behavior in Chromatography
… phase compressibility leads to gradients in linear velocity and solute retention and affects separation speed and efficiency, especially in packed columns. This work describes on-column density measurement of CO2, a common carrier fluid for SFC and SGC, in packed capillary columns using Raman …
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Measuring Kinetic Performance of Monolithic and Fused-Core Columns Using Packed-Capillary Liquid-, Ultrahigh-Performance- and Supercritical Fluid Chromatography
… (using packed-capillary LC in 0.46-2.70 mm/s linear velocity range), but did not provide better performance than the fused-core column at high-speed separations (using UPLC in 0.67-6.76 mm/s linear velocity range). The kinetic performance parameters (minimal plate height, Hmin; maximal plate …
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Motion Coordination of Aerial Vehicles
… a predefined attitude trajectory without angular velocity measurements. We also propose some velocity-free consensus-seeking schemes allowing a group of spacecraft to align their attitudes, without reference trajectory specification. The second part of this thesis is devoted to the control of a …
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Intertwined evolution of swimming, morphology and microhabitat in tree frogs from the subfamily Hylinae
… 31 species and 14 genera. Our data set includes linear velocity, forelimb and hind limb behavior, and we categorized aquatic and arboreal microhabitats. I estimated the correlations among the evolution of traits along the phylogeny by using the threshold model. I found that Hylinae species use …
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Theoretical investigation of the initial response of a thin ring to a radial shock pulse
… and tangential components of displacement and velocity are found in series form by use of Duhamel's integral. A plane shock front is assumed to propagate normal to a diameter of the ring with constant linear velocity and to be followed by a parabolic decay. It is also assumed that the motion of …
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Development and Application of Magnetic Resonance Imaging Techniques for the Study of Exercise-Induced Angiogenesis in the Rat Brain
… we can conclude from these results that the linear velocity of flowing blood within the motor cortical capillaries of animals that have exercised is slower at baseline conditions than in control animals. Under hypercapnic conditions we have found that both blood flow and volume are increased …
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Energy Modeling of Deceleration Strategies for Electric Vehicles
… power are modeled backward from prescribed linear velocity curves, and the coasting trajectory is forward modeled given zero tractive power. Decel modes based on zero battery and motor power are also forward modeled. Multi-Mode decel (using a low power mode with regen) is presented as an …
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Development of a whole-stalk sweet sorghum harvester
… machine worked best when the flipper tangential velocity was 24 percent higher than the gathering belt Linear velocity, which was approximately (within six percent) equal to ground speed. The harvester was pulled behind a tractor and powered with a universal joint drive line. Two computer …
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Head Impact Conditions and Helmet Performance in Snowsports
… have found that a combination of rotational and linear velocities is the most mechanistic way to model brain injury, but despite decades of research, the biomechanical mechanisms remain largely unknown. However, evidence suggests a difference in concussion tolerance may exist between athlete …
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Characterization of Perphenazine and Scopolamine Aerosols Generated Using the Capillary Aerosol Generator
… the formulation flow rate increased the linear velocity of the spray, thus the Reynolds number was increased and smaller particles were generated.
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Molecular Origins of Phase Stability in Phase-Change Nano-Emulsions for Thermal Energy Storage by NMR Spectroscopy
… selection was applied to measure the velocity profile and concentration distribution of the oil within the gap, revealing non-linear velocity profiles and the shear-induced mass transport of nano-emulsion droplets. <sup>1</sup>H NMR Transverse relaxation times increased at higher shear …
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Analysis and Modeling of Magnetized Microswimmers: Effects of Geometry and Magnetic Properties
… microswimmers. We demonstrate the criterion for linear velocity-frequency response and minimization of wobbling motion. One approach to improve the adaptability of swimmers to various environments is to use modular units that can dynamically assemble and disassemble on-site. We propose a model to …
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A study of flow and heat transfer of nanofluids: between two parallel plates, over a wedge and past a stretching sheet
… over a dynamic stretching sheet with non-linear velocity and variable thickness in the presence of Brownian motion and thermal radiation. Secondly, the effect of a chemical reaction is taken into account. These two problems have been investigated using the OHAM and RK4. Lastly, a …
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Studies of tris(2,2'-bipyridyl)ruthenium(II) electrogenerated chemiluminescence for detection in flowing streams
… intense emission but working curves have poor linearity and emission intensities have large dependence on solution flow rate. The in-situ/solution mode is superior for the detection of amino acids and has time, convenience, and reliability advantages. The in-situ/immobilized mode results in …
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