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 “"Anomalous transport"”.
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Anomalous transport in complex networks
The emergence of scaling in transport through interconnected systems is a consequence of the topological structure of the network and the physical mechanisms underlying the transport dynamics. We study transport by advection and diffusion in scale-free and Erdős-Rényi networks. Using stochastic …
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Anomalous transport through porous and fractured media
Anomalous transport, understood as the nonlinear scaling with time of the mean square displacement of transported particles, is observed in many physical processes, including contaminant transport through porous and fractured geologic media, animal and human foraging patterns, tracer diffusion in …
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Lattice QCD Study of Anomalous Transport Phenomena in Strongly Interacting Matter
… is the first non-perturbative calculation of an anomalous transport conductivity in physical QCD. In the case of the CME, we show that this effect is not present in thermal equilibrium, in accordance with Bloch's theorem, both for free fermions and in QCD. We emphasize the crucial role of using a …
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Novel Aspects of Localization, Delocalization, and Anomalous Transport in One-dimensional Systems
… of disorder leads to superballistic transport in the momentum space.
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ANOMALOUS TRANSPORT:_FROM THEORIES ABOUT OSMOTIC PRESSURE TO A NEW APPROACH IN THE FRAMEWORK OF DYNAMICAL SYSTEMS
… volume of solute molecules, or the mechanism of transport of molecules inside the pores of the membrane. This last issue concerning is of particular interest and deserves further investigation. In a current article that focuses on a new kind of phenomenon called "transient osmosis" we find, first …
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Contributions in fractional diffusive limit and wave turbulence in kinetic theory
… split in two different topics. Firstly, we study anomalous transport from kinetic models. Secondly, we consider the equations coming from weak wave turbulence theory and we study them via mean-field limits of finite stochastic particle systems. $\textbf{Anomalous transport from kinetic models.}$ …
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Theoretical transport model for tokamaks
In the present thesis work a theoretical transport model is suggested to study the anomalous transport of plasma particles and energy across the axisymmetric equilibrium toroidal magnetic flux surfaces in tokamaks. The model suggests a linear combination of two transport mechanisms; drift waves, …
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Methods for Testing Transport Theories
Classical transport based on simple particle collisions theory underestimates the rates of energy losses. The main sources of energy transport are instabilities due to fluctuations in magnetic fields, electric fields, and plasma density and/or temperature gradient. Although many theoretical models …
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Studies of electron temperature fluctuations in the core of Alcator C-Mod plasmas via correlation electron cyclotron emission
Transport in tokamak plasmas is higher than predicted by neoclassical theory; this anomalous transport is believed to be attributed to turbulent fluctuations. New Correlation Electron Cyclotron Emission (CECE) experiments on Alcator C-Mod show lower levels of electron temperature fluctuations in …
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Dynamics in a Fermi lattice gas
… experiments. In the first, we investigated the transport properties of a Fermi lattice gas by directly measuring the transport lifetime at various interaction strengths and temperatures. The resistivity is inferred from the measured transport lifetime. We observe anomalous transport behavior, …
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Quantum transport in strongly interacting, ultracold fermi gases in box potentials
Transport of strongly interacting fermions is crucial for systems as varied as high-𝑇 subscript 𝑐 superconductors, twisted bi-layer graphene, nuclear fission, and neutron stars. In this thesis, I will describe the experiments we performed to measure the transport properties of a …
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Active Transport in Chaotic Rayleigh-Bénard Convection
The transport of a species in complex flow fields is an important phenomenon related to many areas in science and engineering. There has been significant progress theoretically and experimentally in understanding active transport in steady, periodic flows such as a chain of vortices but many open …
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Mucoadhesive buccal tablets for the delivery of nicotine and Delta9-tetrahydrocannabinol.
… of nicotine for this matrix was controlled by an anomalous transport mechanism dependent on both drug diffusion and polymer relaxation. Investigation of these controlled release layers indicated that both hydrogen bonding and polymer entanglement with the mucus layer was responsible for adhesion …
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The Effects of Weak Collisions on Nonlinear Plasma Kinetics
… believed to be responsible for the generation of anomalous resistivity in reconnection layers, providing a possible mechanism for fast reconnection. The concept of Landau damping is fundamental to such wave kinetic instabilities in space, and is treated typically within the framework of the …
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Stabilization of electron-scale turbulence by electron density gradient in NSTX
… and is believed to play a major role in driving anomalous transport levels that exceed neoclassical theory predictions. In NSTX, electron thermal transport is found to dominate energy loss. Theory and experiments have shown that electron temperature gradient (ETG) turbulence on the electron …
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Electrostatic Trapping as a Self-Consistent Phenomenon in Plasmas and other Collective Systems
… predictions about stability and the associated anomalous transport. Thus it is not surprising that the problem of transport represents a not yet closed chapter in the theory of plasmas, a fact which is shown in many examples from fusion and space research, where almost collisionless plasmas are …
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Hamiltonian chaos: from galactic dynamics to plasma physics
… We further investigate the long-term diffusion transport and chaos properties of single and coupled standard maps, focusing on parameters that induce anomalous diffusion through the presence of accelerator modes exhibiting ballistic transport. Using different ensembles of initial conditions in …
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Quantifying non-Fickian transport in porous and fractured media using fractional-calculus based stochastic models
Non-Fickian or “anomalous” transport, where the target’s spatial variance grows nonlinearly in time, describes the pollutant dynamics widely observed in heterogeneous geological media deviating significantly from that described by the classical advection dispersion equation (ADE). The ADE describes …
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Fluctuation induced cross-field transport in Hall thrusters and tokamaks
… physics which remains poorly understood is the transport of particles across magnetic field lines at rates significantly higher than predicted by theory exclusively based on collisions. This "anomalous" transport is observed in many different classes of plasma experiment. Notably, both magnetic …
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Spontaneous symmetry breaking transport : from anomalous response to chiral separation
… but there may be dynamical states of sustained transport spontaneously breaking the symmetry in the deterministic limit, named spontaneous symmetry breaking transport. If the symmetry of the dynamics is broken by a small perturbation, e.g. a constant bias force, the particle mobility may be in …
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