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 28 for “"hydrodynamic regime"”.
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Hydrodynamic and ballistic transport in high-mobility GaAs/AlGaAs heterostructures
… In this work, we explore non-diffusive transport regimes, namely, the ballistic and hydrodynamic regimes in a high-mobility two-dimensional electron system in a GaAs quantum well in a GaAs/AlGaAs heterostructure. The hydrodynamic regime exhibits collective fluid-like behavior of electrons which …
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A molecular dynamics study of the tribological properties of diamond like carbon
… from pure slip ( dry friction) to the purely hydrodynamic regime using a simple model which superposes the two effects, provided it also accounts for any immobile fluid layers at the fluid-solid interface. We show that, for water lubrication, the transition from the pure slip to the purely …
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Signatures of hydrodynamic transport in an electron system
… collective behaviors. Here we explore how the hydrodynamic behavior manifests itself in the electron transport through nanoscale constrictions. Free electron flows through constrictions in metals are often regarded as an ultimate high-conduction charge transfer mechanism. However, as shown in …
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Relation of electron scattering cross-sections to drift measurement in noble gases
… for drift measurements which are valid in the hydrodynamic regime. These expressions are then used to estimate the ⁴He scattering cross section, first by a simple grid interpolation and then through a genetic algorithm (GA). This technique demonstrates that the 4He momentum-transfer cross …
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Effects of piston design and lubricant selection on reciprocating engine friction
… on engine efficiency. The model incorporated hydrodynamic, boundary, and mixed lubrication modes, and it allowed for either fully-flooded or partially-flooded skirts. It also considered the effects of skirt deformation in response to applied loads. A dominant factor influencing net friction …
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Macro-scale investigation of high speed gas bearings for MEMS devices
… is introduced along with the traditional hydrodynamic regime. The new hybrid mode is exploited to implement a novel in-situ rotor balancing scheme which enables hydrodynamic operation. Analysis for both modes of operation is presented along with experimental results. A high-order, …
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A viscoelastic hydrodynamic approach to the density fluctuations in classical liquids
… inverse perspective adopted in the generalized hydrodynamics and extends the macroscopic hydrodynamic theory to the shorter-wavelength and higher-frequency regime. Specifically, in this work, a viscoelastic hydrodynamic approach is proposed to describe the density fluctuations in supercooled …
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Lubrication in the ball and socket joint of a swash plate mechanism
… rod in a swash plate engine is studied in the hydrodynamic regime. The engine operates at 1390rpm with an axial load on the rod as high as 1 x 10⁴N. The instantaneous load and kinematics from a previous study for a swash plate engine was used as the input. The ball and socket were assumed to be …
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Phonon hydrodynamic transport at elevated temperature
For over half a century, phonon hydrodynamic transport was deemed exotic and mattered only at extremely low temperatures. In this work, by combining the theoretical and experimental approach, we successfully predict and confirm the existence of phonon hydrodynamic transport in graphite above 200 K. …
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Novel transport regimes in graphene
… platform to study a range of new transport regimes, such as quantum-coherent ballistic transport, electron hydrodynamics and energy dissipation at the atomic scale. We will study ballistic transport in the context of electronic lensing. We will also demonstrate that electron-electron …
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Phonon hydrodynamic transport at elevated temperature
For over half a century, phonon hydrodynamic transport was deemed exotic and mattered only at extremely low temperatures. In this work, by combining the theoretical and experimental approach, we successfully predict and confirm the existence of phonon hydrodynamic transport in graphite above 200 K. …
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Integrating bioenergetics and foraging behavior : the physiological ecology of larval cod (Gadus morhua)
… against the high cost of swimming in a viscous hydrodynamic regime? A respirometry system was developed to measure the activity metabolism of individual larvae. The cost of swimming was modeled as a power-performance relationship (energy expenditure as a function of swimming speed) and as the …
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Solarization as a means to eliminate invasive plant species and target the seedbank
… dramatically in both its species composition and hydrodynamic regime due to years of human influences. What was once a thriving population of native plant species has become an environment dominated almost completely by aggressive exotic invasive species. The goal of this project was to remove the …
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Fast Sound Propagation in Binary Fluid Mixtures
… densities. This fast mode appears beyond the hydrodynamic regime. One can call this mode fast sound, because, like ordinary sound, it propagates, but it is faster. The most important point is that the fast sound is associated with the dynamics of the light component only. In the thesis I …
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Programmable surfaces
… fluids. This research explores a synthetic hydrodynamic regime, using a programmable surface to dynamically alter the flow around an object. Recent advances in distributed computing and communications, actuator integration and batch fabrication, make it feasible to create intelligent active …
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Nonlocal ballistic and hydrodynamic transport in two-dimensional electron systems
… leading to the onset of non-diffusive transport regimes, where Ohm's law is no longer valid. Within these non-diffusive regimes, the hydrodynamic regime occurs when momentum-conserving electron-electron scattering length scale is smaller than the device length scale (usually at intermediate …
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Superfluidity in a uniform two-dimensional Bose gas
… dimensions, predicted by the highly successful hydrodynamic two-fluid model and observed in both liquid helium and ultracold atomic gases, is the existence of two kinds of sound excitations, the first and second sound. Unlike its three dimensional counter-part, however, superfluidity in two …
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Single and multiphase mixing in partially filled stirred vessels
… liquid can become quite complex, with different regimes possibly existing depending on the geometric characteristics of the system (such as impeller clearance, liquid height, or liquid submergence above the impeller). The objectives of this work were to study in detail the hydrodynamic changes …
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Integrating bioenergetics and foraging behavior : the physiological ecology of larval cod (Gadus morhua)
… against the high cost of swimming in a viscous hydrodynamic regime? A respirometry system was developed to measure the activity metabolism of individual larvae. The cost of swimming was modeled as a power-performance relationship (energy expenditure as a function of swimming speed) and as the …
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The role of coastal defence structures in channeling production in coastal ecosystems
… structures’ (LCSs), design features and hydrodynamic regime on the<br/>quantity and timings of macroalgae deposition. The employed sampling strategy comprised a<br/>spatially and temporally stratitified approach of time-lapse photography of macroalgae<br/>deposition, verified with field …
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