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 29 for “"Pinch-off"”.
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Influences of surfactant on the breakup of a fluid jet in viscous surrounding
… surfactant at the interface retards the pinch-off. The influence of surface diffusion of surfactant on the jet deformation is studied by varying surface Peclet number. It is found that greater diffusion of surfactant causes the jet to pinch faster. To check the predictions of our model, …
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Crossing the Air-Water Interface: Inspiration from Nature
… to the third stage of water-entry (air-cavity pinch-off), in which the chest feathers come in contact with the water. Here, the elasticity of Northern Gannet contour feathers is calculated using the nonlinear bending equation. The third topic will explore the formation of ripples along air …
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Study of phenomenologies during templated solid-state dewetting of thin single crystal films
… under certain conditions, and this valley can pinch off the rim, resulting in wireline structures. This pinch-off phenomenon was also found to be strongly dependent on the inplane orientation of the retracting edge. It was determined that pinch-off occurs more easily when the additional surface …
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Templated Solid-State Dewetting of Single Crystal Ni Thin Films
… instead of an alternative phenomenon called rim pinch-off were investigated. It was found that an initial edge roughness leads to the development of fingering and that fingering can be induced by intentionally pre-patterning film edges with periodic roughness. Furthermore, it was found that …
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Fluid Dynamics in Liquid Entry and Exit
… the acceleration of a solid sphere. The pinch-off dynamics of a liquid column is categorized as two branches: upper and lower pinch-off's. The pinch-off location affects the entrained liquid volume adhered to the solid object, which is directly related to the uniform quality of a …
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Mechanics, shape, and programmability in soft matter systems: From fluid membranes to spring and droplet networks
… polymerizing actin filaments, followed by (iii) pinch-off. Our results suggest that the pinch-off mechanism may be assisted by a pearling-like instability. In addition, we potentially rule out two of the three competing models for the organization of the actin filament network during the …
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Nonlinear thermoacoustic oscillations of a ducted laminar premixed flame
… that the wrinkles on the flame surface and pinch off of flame pockets are regular for periodic oscillations, while they are irregular and have multiple time and length scales for quasi-periodic and chaotic oscillations. Cusp formation, their destruction by flame propagation normal to itself, …
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Degradation study of AIGaN/GaN HEMT through electro-thermo-mechanical calculations and thermo-reflectance measurements
… energy density in the transistors under the pinch-off conditions. Most previous work have studied the inverse piezoelectric effect on device degradations, however, quantitative analysis of this failure mechanism is still needed. In this thesis, we have developed the first fully-coupled …
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Equilibrium configurations of oxygen bubbles on surfaces for applications in nanostructured hematite electrodes
… of a nanorod, grow in volume, and detach or pinch-off from the nanorod.
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The Complex Spatiotemporal Dynamics of a Shallow Fluid Layer
… contribute most to the chaotic dynamics. Roll pinch-off and roll mergers are found to be the largest contributors. Two dimensional and three dimensional Faraday waves are studied with periodic boundary conditions. The full Navier-Stokes equations are solved including the complex dynamics of the …
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On falling spheres : the dynamics of water entry and descent along a flexible beam
… shape and yields an analytical solution for the pinch-off time and depth. We also examine low-density spheres that decelerate substantially following impact, and characterize the deceleration rate and resulting change in behavior of the associated water-entry cavities. Theoretical predictions …
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Templated dewetting of thin solid films
… breaking up into particles while thinner films pinched off to form particles in the pits and grooves. If the pits or grooves were far apart, the pinch off also resulted in particles forming on the mesas between the pits. If the pits or grooves are close together, all the material pinches off …
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Coordination among proteins, lipids and water in membrane fusion and fission probed by solid-state NMR
… to exit the cell, a new virus particle will pinch off a piece of the host cell membrane. The two membranes must be physically separated to release the virus particle. This process is called “scission” in the context of viral exit and “fission” when simply discussing membrane division. Viral …
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Solid-state dewetting of continuous and patterned single crystal Ni thin films
… corners, edge drag at convex corners, edge pinch-off, and Rayleigh-like instabilities. Clear identification of these instabilities leads to improved understandings of the kinetic mechanisms that govern the formation of complex dewetting morphologies. We also demonstrate that solid-state …
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Calcium, actin and the spectrin skeleton: Responses to swelling and shrinking perturbations.
… may be the structures which help the VLD pinch off from the substrate and therefore begin reinternalization of excess surface membrane. (Abstract shortened by UMI.)
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Numerical simulations of instabilities in general relativity
… instabilities can cause the black hole to pinch off, and we study the approach to the naked singularity in detail. Another question that has attracted intense interest recently is the instability of anti-de Sitter space. In this thesis, we explore how breaking spherical symmetry in …
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Intrusions of sub-Antarctic surface water across the subtropical convergence southwest of Africa
… through the retroflection loop to effectively "pinch" off these rings. The resultant entrainment of cold Sub-Antarctic Water Surface (SAASW) behind the displaced STC is of climatic and oceanographic interest in light of the concurrent interruption and eastward retreat of the warm Agulhas …
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Isosurface Interactions Within Turbulent Premixed Hydrogen and Hydrocarbon Flames
… reactants or products is associated with flame pinch--off events which cause rapid changes in the flame surface area. In the past, the analysis of pocket formation in turbulent premixed flames has been carried out in two dimensions. In this thesis, the topological analysis is carried out in …
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Highly scaled silicon field emitter arrays with integrated silicon nanowire current limiters
… reliability through velocity saturation and the pinch-off of majority carriers. The 2-[mu]m thick SiO₂ insulator between the gate and the substrate and the conformal dielectric matrix that embeds the nanowire current limiters prevents charge injection and minimizes the capacitance between the …
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Progress towards GaAs multiplexed single-electron pump arrays
… wider gates: more negative voltage is needed to pinch off 0.1 $\mu$m wide bar gates, because 0.1 $\mu$m is comparable with the 2DEG depth. We redesign the multiplexer structure and determine that the capacitance of the multiplexer is about 1.93 pF which will help the future multiplexed …
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