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 1396 for “"Spreading"”.
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Axial structure of fast spreading mid-ocean ridges : implications for overlapping spreading centers
Thesis (M.S.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1986.
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Wetting kinetics in forced spreading
<p>"Under dynamic conditions, the dynamic contact angle (the angle that the liquid makes with the solid) of a liquid on a solid surface varies dramatically with substrate velocity from its equilibrium value. Experimental data of the dynamic contact angles for polydimethylsiloxane (PDMS or silicone …
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Characterizing the spreading behavior of radius, contact angle, and spreading velocity of trisiloxane "superspreader" surfactants:/
… have had inconsistent results characterizing the spreading of these surfactants. In this study, the radius and contact angle during spreading of different concentrations of trisiloxane ethoxylate are measured in a humidity-controlled box. Consistent with other studies, concentrations above the …
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Spreading behavior of molten metal microdroplets
… manufacturing (DBM) processes. Although the spreading behavior of ordinary liquid and molten droplets has been studied extensively for years, some basic questions remain unanswered. Specifically, the fundamental mechanisms of abnormal spreading behavior, such as splashing and bouncing, have …
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Geothermal processes at the Galapagos Spreading Center
… of the heat flow field of the Galapagos Spreading Center in an area of about 570 km2 reveal the planform of the conductive flux and permit the first truly areal estimate of the near-axis heat flux for comparison with theoretical plate cooling models. The intrusion process and associated …
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Grieving (and) Weaving (and) Spreading (and) Becoming
… this thesis paper, Grieving (and) Weaving (and) Spreading (and) Becoming, I will explore my practice of subverting and incorporating found images, video, Slavic motifs, text and text(iles) in a disembodied search for identity, reconnection and softness. My arts-informed research project uses …
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Voltage induced spreading and liquid optical devices
… forces are used to actuate bulk liquid spreading and to imprint a deformation pattern at a liquid air surface. Our basic conguration uses a set of co-planar stripe interdigital electrodes to create a non-uniform A.C. electric field that exponentially decays in amplitude and penetrates …
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Enhanced droplet spreading due to thermal fluctuations
… thin liquid films, in this work we study the spreading of a large molecular drop on a solid plate and test whether thermal forces can dominate spreading dynamics as predicted by Davidovitch et al.. By comparing the spreading of a simulated molecular drop, we not only find an enhanced spreading …
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Neuromorphic cross correlation of digital spreading codes
… wireless communication systems that use digital spreading codes to divide a single communication medium into separate channels. This technology is used in many systems such as GPS, ZigBee and GSM mobile communications. The technology is renowned for its robustness and security since it is highly …
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An interferometric study of spreading liquid films
… flows depending on the scale and speed of the spreading process. In this research, a number of benchmark problems involving moving contact lines of viscous Newtonian and non-Newtonian polymeric fluids have been studied using non-invasive optical techniques. A detailed study of viscous Newtonian …
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Lateral Spreading Mechanics of Column-Supported Embankments
… also responds in tension to lateral spreading. Herein, lateral spreading is defined as the lateral displacements occurring in response to lateral earth pressures in the embankment and foundation. Excessive lateral spreading can lead to bending failure of the concrete columns, tensile …
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Dynamic Pile-Soil Interaction in Laterally Spreading Slopes
… in Peru). Liquefaction-induced lateral spreading is known to be one cause of severe damage to deep foundation systems. However, the dynamic soil-structure interaction between liquefied soil and piles is extremely complex and further work is required to define the appropriate design …
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Modelling the spreading and draining of viscous films
… In the first technical chapter a model for the spreading of viscous films on the surface of a deep viscous pool is considered. Although this model neglects the effects of drainage it enables analytical progress to be made. As such, insight is gained into how the spreading logs interact with one …
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Control, Dynamics, and Epidemic Spreading in Complex Systems
… for a discrete time-step model of epidemic spreading on uncorrelated networks. The effect of degree distribution, time delays, and infection rate on the stability of oscillating and fixed point solutions is examined through analysis of discrete time mean-field equations.
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Impact, spreading, and drying of complex fluid drops
… a sequence of coupled processes—rapid inertial spreading, capillary-driven relaxation, contact-line motion, imbibition into porous substrates, evaporation, and, in complex fluids, compositional redistribution. This thesis investigates how these mechanisms collectively shape the observable …
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An experimental investigation of oil spreading over water.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1970.
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Intense spreading of radar echoes from ionospheric plasmas
… in Puerto Rico, inducing significant range spreading on ionograms. This phenomena may be explained by means of the E x B instability and gravitational Rayleigh-Taylor instability. A derivation of the dispersion relations for X and O mode waves transmitted from an ionosonde and an analysis of …
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Microsensor development for the study of droplet spreading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Parametric Analysis of Particle Spreading with Discrete Element Method
<p>The spreading of metallic powder on the printing platform is vital in most additive manufacturing methods, including direct laser sintering. Several processing parameters such as particle size, inter-particle friction, blade speed, and blade gap size affect the spreading process and, therefore, …
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