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 9 of 9 for “"fluid approximation"”.
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Many-Server Queues with Time-Varying Arrivals, Customer Abandonment, and non-Exponential Distributions
This thesis develops deterministic heavy-traffic fluid approximations for many-server stochastic queueing models. The queueing models, with many homogeneous servers working independently in parallel, are intended to model large-scale service systems such as call centers and health care systems. …
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Electron Currents in Field Reversed Mirror Dynamics--Theory and Hybrid Simulation
… field and ion drag. Past workers, using a fluid description, have suggested that this cancellation may be virtually complete, making impossible the steady state operation of the FRM as well as its start-up by neutral-beam injection. However, the fluid approximation is invalid near a field …
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Redesigning liver allocation regions through optimization
… optimization formulation. Specifically, we use a fluid approximation to model the dynamics of the wait-list progression and liver allocation. The model is fit using historical data of wait-list candidates and donors. Then, we propose two optimization formulations to reduce geographic inequality. …
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Models for Capacity Allocation in Anticipation of Time-Varying Demand
… arrivals, and abandonment. Based on its fluid approximation, we propose an approach to determine optimal stationary staffing levels by partitioning the time-limiting solution of the dynamical system. We test our method by applying it to two real-world applications, i.e., advertising …
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Development of probes for assessment of ion heat transport and sheath heat flux in the boundary of the Alcator C-Mod Tokamak
… to the last closed flux surface in C-Mod. A ₁D fluid simulations is built to interpret edge ion heat transport. At high collisionality-where the fluid approximations are valid: the simulation reproduces the measured edge ion-to-electron temperature ratio (~ 2). However, at low …
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Cio-cio-san no yuutsu: memoirs of magnetogenesis and turbulent dynamo theory
… General Ohm's Law as a consequence of the two-fluid approximation of a plasma, derivation of the Induction Equations incorporating the aforementioned battery term, introduction and discussion of the Chaplygin Gas and its place in the field of Cosmology, energetics governing the flow of kinetic- …
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Cio-cio-san no Yūutsu: memoirs of magnetogenesis and Turbulent Dynamo Theory
… General Ohm's Law as a consequence of the two-fluid approximation of a plasma, derivation of the Induction Equations incorporating the aforementioned battery term, introduction and discussion of the Chaplygin Gas and its place in the field of Cosmology, energetics governing the flow of kinetic- …
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Competition and Yield Optimization in Ad Exchanges
… a campaign. We introduce the novel notion of a Fluid Mean Field Equilibrium (FMFE) to study the dynamic bidding strategies of budget-constrained advertisers in these repeated auctions. This concept is based on a mean field approximation to relax the advertisers' informational requirements, …
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Hybrid methodology for Markovian epidemic models
… a promising alternative to these approaches. The fluid limit [Kurtz, 1970] and diffusion limit [Kurtz, 1971] are large-population approximations of a particular class of CTMC models which approximate the evolution of the underlying CTMC by a deterministic trajectory and a Gaussian diffusion …