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 46 for “"lattice gas"”.
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Lattice gas wind tunnel
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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Dynamics in a Fermi lattice gas
We use 40K atoms trapped in a cubic optical lattice to simulate the Fermi-Hubbard model. The work in this thesis focuses on investigating dynamics in the Fermi-Hubbard model and developing techniques for engineering Hamiltonians beyond the minimal Hubbard model. We discussed three experiments. In …
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Lattice gas hydrodynamics with Galilean invariance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1988.
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Low-diffusivity lattice-gas models of mixtures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Continuum limit of lattice gas fluid dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1992.
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Lattice gas models and simulations of epitaxial growth
… (MBE). The basic idea is to use a discrete lattice gas representation of the crystal structure, and to apply kinetic Monte Carlo (KMC) simulations for the description of the growth dynamics. The main advantage of the KMC approach is the possibility to account for atomistic details and at the …
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Controlling non-equilibrium dynamics in lattice gas models
… variant of the Katz–Lebowitz–Spohn (KLS) driven lattice gas in two dimensions, where the lattice is split into two regions that are coupled to heat baths with distinct temperatures T > T<sub>c</sub> and T<sub>c</sub> respectively, where T<sub>c</sub> indicates the critical temperature for phase …
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Experimental demonstration and exploration of quantum lattice gas algorithms
Recently, it has been suggested that an array of small quantum information processors sharing classical information can be used to solve selected computational problems, referred to as a type-II quantum computer. The first concrete implementation demonstrated here solves the diffusion equation, and …
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Lattice-gas cellular automata for the analysis of cancer invasion
… focus on an important class of CA, the so-called lattice-gas cellular automata (LGCA). In contrast to traditional CA, LGCA provide a straightforward and intuitive implementation of particle transport and interactions. Additionally, the structure of LGCA facilitates the mathematical analysis of …
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Scaling of Steady States in a Simple Driven Three-State Lattice Gas
… states in a simple three-state stochastic lattice gas are investigated. A two dimensional finite lattice with periodic boundary conditions is filled with one hole and two oppositely "charged" species of particles, subject to an excluded volume constraint. Starting from a completely …
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Phase Diagram of a Driven Lattice Gas of Two Species with Attractive Interactions
We study the phase diagram of an interacting lattice gas of two species of particles and holes, driven out of equilibrium by a local hopping bias (denoted by `E'). Particles interact by excluded volume and nearest-neighbor attractions. We present a detailed Monte Carlo investigation of the phase …
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Static and dynamic correlation in lattice gas systems : an application to the intermetallic hydride ZrV2Hx
… for the simulation of particle diffusion on a lattice gas ispresented. The particle transition probability is calculated as a function of threeparameters: lattice site energies, inter-particle interactions and neighbour jump-rates.GRT evaluates either the self correlation function, Gs(r,t), or …
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Monte Carlo and Series Expansion Studies of the Anisotropic Driven Ising Lattice Gas Phase Diagram
… equilibrium properties are well known. The Ising lattice gas displays a number of surprising phenomena when driven into nonequilibrium steady states. This study extends previous work to a more general model with anisotropic interparticle interactions. Using Monte Carlo simulations, we obtain the …
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Monte-Carlo Simulation of Diffusion as an Aid to Interpreting Quasi-elastic Neutron Scattering from Lattice Gas Systems with Diffusion on Multiple Time-Scales
… jumps between octahedral sites in the fcc lattice. The observation of an additional QENS component arising from motion on significantly more rapid timescale has recently been reported (Steel, 2018), whereby a localised-type motion between tetrahedral and octahedral sites has been suggested. …
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Development of a collision table for three dimensional lattice gases
A lattice gas is a species of cellular automaton used for numerically simulating fluid flows. TransGas [9], the lattice gas code currently in use at the CSIR, is based on the FHP-I model [5], and is used to perform various two-dimensional flow simulations. In order to broaden the scope of the …
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Hydrogen in niobium-tantalum superlattices
Hydrogen has been dissolved in Nb/Ta superlattices for which the structural and thermodynamic properties of this new H-metal system were studied, in situ, by x-ray diffraction. It is found that H induces a strain modulation exhibiting a Curie-Weiss type temperature dependence, thus, providing a …
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Steady State Properties of Some Driven Diffusive Systems
… variations of the prototype, the driven Ising lattice gas. Our first system studied is the bilayer model, a stack of two driven Ising lattice gases allowed to interact. We study this model using a very simple analytic approximation, the high temperature expansion. Building on existing …
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Thermodynamics of oxygen ordering in YBa₂Cu₃O₆₊
… are classed into two basic approaches: lattice gas models and defect chemical models. It is found that the lattice gas models which assume static effective pair interactions between oxygen atoms, do not fit the experimental data very well, especially in the orthorhombic phase. The defect …
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Sorption in disordered porous media
The lattice-gas model of sorption in disordered porous media is studied for a variety of settings, using existing, updated and newly developed numerical techniques. Firstly, we construct an efficient algorithm to calculate the exact partition function for small lattice-gas systems. The exact …
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Fluid flow in porous media : NMR imaging and numerical simulation
… of fluid flow through the rock using the lattice gas method. The computed permeability is several orders of magnitude lower than the laboratory measured permeability, most likely a result of the image resolution being too coarse to resolve the smaller pore throats, which are believed to be …
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