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 191 for “"centerline"”.
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The Effect of Lane Departure Warning Systems on Cross-Centerline Crashes
Cross-centerline crashes occur rarely in the United States but are especially severe. This type of crash is characterized by one vehicle departing over a centerline and encountering a vehicle traveling in the opposite direction. In recent years, automakers have started developing and implementing …
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Evaluation of external noise produced by vehicles crossing over centerline rumble strips on undivided highways in Kansas
Centerline rumble strips (CLRS) are raised or indented patterns installed in the center of undivided rural two-lane highways. Their main function is to alert drivers who are encroaching or leaving the intended travel lane, by producing vibration and noise when crossed by vehicles’ tires. CLRS have …
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Large Deflections of Helical Springs
… the angle of rotation of one end of the spring centerline with respect to the other end of the spring centerline exceeds the range within which small angle approximations are possible and may be as large as (pi) radians. The spring is treated as a prismatic bar with known compressive, bending, …
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Laminar viscous resuspension in two-dimensional channels
… particle concentrations; between the channel centerline and the top channel wall, along the centerline and between the centerline and the bottom channel wall. However due to gravity effect the highest particle concentration is at the bottom wall. The maximum concentration near the top wall …
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Hollow Plume Mitigation of a High-Efficiency Multistage Plasma Thruster
… at angles rather than up the thruster centerline, causing a dip in ion current along the centerline. A laboratory model, built at JPL, was run at Cal Poly to characterize this plume shape and implement a shield to restore a conical shape to the plume. A similar solution was used on a …
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Optimizing the selection of rumble strip design and construction
… and rank top-performing designs for shoulder, centerline, and transverse rumble strips that are capable of reducing traffic crashes while minimizing their external noise impact on nearby residents. This research study also developed a novel model for ranking and optimizing the selection of …
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A study of tip-leakage flow through orifice investigations
… visualize the flow in a long orifice and model centerline pressure variation, a water table study was performed. The results demonstrate that the flow separates from the sharp corner at the orifice entrance, it accelerates to a maximum Mach number, and then the pressure increases. For back …
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An Experimental Investigation Into the Effect of Plasma on the Flow Features of an Axisymmetric Jet
… turbulent kinetic energy decreased along the jet centerline by 7% to 14% and were not influenced by compressibility which is consistent with increased jet penetration. However, in pipe-flow jets the centerline turbulent kinetic energy decreased at low equivalent Mach numbers, reversing to slight …
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Analysis of the operational impacts of alternative propulsion configurations on submarine maneuverability
… is propulsion concepts not constrained by a centerline shaft. This thesis investigates the operational impacts that a conceptual propulsion configuration involving the use of azimuthing podded propulsors has on a submarine. Azimuthing pods have been used commercially for years, with …
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Magnetophoretic cell clarification
… walls and areas of low magnetic field at the centerline, inducing non-magnetic particles to concentrate at the centerline, where they were removed through a coaxial central outlet tube at the top of the column. Depending on the flow rate, up to 99% of polystyrene beads of different sizes could …
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Radiative impacts on water mist/cloud droplet condensative growth
… flux varied from 85 to 184 W/m2 and minimum (centerline) droplet residence time in the radiative section varied from 15 to 60 seconds. Droplet sizes increased significantly after they underwent radiative cooling. For example, with 145 W/m2 radiative flux, the volume-average size (D43) …
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Jet processing of direct chill cast aluminum ingots
… grains play on magrosegregation along ingot centerlines. We propose that avalanche events drive the grains from the solidification front to the ingot center. In order to demonstrate and control this preferential settling, we propose the use of a turbulent jet to re-suspend the avalanching …
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Study of particulate matter formation and evolution in near-field aircraft plumes using a one-dimensional microphysical model
… using the one dimensional model following a centerline trajectory up to lkm downstream of the engine exit plane. PM formation and evolution characteristics along trajectories from several radial locations were also investigated and compared to the results from the centerline study. The …
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Feedbacks between flow, vegetation, deposition, and the implications for landscape development
… For all gap widths (A), the velocity on the centerline between the patches (Uc) was elevated to a peak velocity Umax that persisted over a distance L. Although Umax was not a function of [delta], L decreased with decreasing [delta]. Beyond Lj, the patch wakes merged, and Uc decayed to a …
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Transient Liquid Phase Bonding of Titanium-, Iron- and Nickel- Based Alloys
… (AgTi, AgTh) appeared in the joint centerline microstructure. While with a Cu interlayer eutectic mixtures and Ti-Cu solid solutions appeared in the joint centerline. The maximum tensile strengths achieved were 160 MPa, 502 MPa, and 3 82 MP a when Ag, Cu and no interlayers were used, …
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Droplet Dispersion in a Turbulent Pipe Flow (Particle, Two-Phase, Diffusion)
… of 50, 90, and 150 (mu)m are estimated. The centerline mean air flow velocity varied from 400 to 2900 cm/sec.
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Design of a wearable ultrasound Doppler sensor to monitor blood flow in the common carotid artery
… blood is then processed to reconstruct the centerline velocity of the artery as well as to provide an estimate of the velocity profile and other physiological parameters. The presented design covers key issues relevant to making this technology wearable mainly handling the location …
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Effect of Flow Distortion on Fuel Mixing and Combustion in an Upstream-Fueled Cavity Flameholder for a Supersonic Combustor
… results in higher concentrations near the cavity centerline, but low mixing uniformity. The shock on cavity case causes the shear layer to separate upstream of the cavity, mixing uniformity is enhanced by the increased breakup of the fuel plume. Combustion is stronger and more uniform in the shock …
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Divergent Plume Reduction of a High-Efficiency Multistage Plasma Thruster
… field to force more ion current towards the centerline. A previous Cal Poly thesis explored the same concept, and that work is continued and furthered here. The previous thesis tested a shield which increased centerline current but decreased performance. A new shield design which should avoid …
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Numerical Simulations in Electro-osmotic Flow
… center. Near the channel inlet, however, the centerline velocity is not a minimum but reaches a local maximum due to a resulting pressure imbalance generated by the wall motion. As the aspect ratio increases, the centerline velocity tends to approach the wall velocity far downstream from the …
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