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 27 for “"density density"”.
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Monte Carlo analysis of non-equilibrium steady states and relaxation kinetics in driven lattice gases
… investigate the long-time behavior of the density-density auto-correlation function in driven lattice gases, with particle exclusion and periodic boundary conditions in one, two, and three dimensions using precise Monte Carlo simulations of larger system sizes than previous studies. In the …
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Temperature and mold size effects on density gradients and mechanical properties in a polyurethane foam system
… the mold and the cellular structure of the foam. Density gradients and the skin are shown to have an effect on the mechanical properties of the foam; This work will investigate the effects of processing temperature and mold size on the average density, density gradient, compressive modulus, and …
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EXOTIC PHASES IN A SPIN-1 BOSONIC FLUX SYSTEM
… functions. However, surprisingly, the connected density-density correlation functions decay with a power law and neutral excitations are gapless. When the hopping strength is sufficiently large or at non-commensurate filling, the system transitions to a superfluid phase characterised by the …
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Experimental Investigation of Ultrafast Hydration Structure and Dynamics at Sub-Angstrom Lengthscales
… mathematics can be used to measure the dynamical density-density linear response function for liquid water with Angstrom spatial resolution and 50fs temporal resolution. The results are compared to high-resolution spectroscopic and scattering experiments and simulations on liquid water to relate …
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Charge structure of a quasiparticle in graphite measured with inelastic X-ray scattering
… attosecond-resolution, real-space electron density imaging technique. We apply the technique to the energy-loss spectra of graphite, which we measured using inelastic X-ray scattering at the Advanced Photon Source in Argonne, IL. The results are images of the anisotropic charge density cloud …
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Lie algebraic similarity transformations: improving wavefunctions for weak and strong correlations
… computational cost. The correlators include the density-density, collinear spin-spin, spin-density cross terms, and on-site double occupancy operators. The resulting non-Hermitian many-body Hamiltonian can be solved in a biorthogonal mean-field approach with only a small set of correlation terms …
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Energy landscape statistics and coarsening in liquids: a relaxation mode analysis
… from experimentally measurable two-point density-density correlation functions, e.g. using quasi-elastic and inelastic scattering experiments. As demonstrations, this RMA approach was used to analyze three empirical models, i.e. exponential relaxation, stretched exponential relaxation, and …
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Optical excitations in cold gases
… the optical spectrum with the f-sum rule for the density-density correlation function. Finally we derive a transport equation for the optical modes in a dilute Bose system, which allows us to study the non-linear response to the excitation field. We map the problem onto the dynamics of two …
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Fourier spectral methods for numerical modeling of ionospheric processes
… naturally and artificially created ionospheric density irregularities. The simulation model consists of two-dimensional electrostatic nonlinear fluid plasma equations that describe the plasma evolution. The spectral and pseudospectral methods are used to solve the spatial dependence of these …
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Fast Sound Propagation in Binary Fluid Mixtures
… of the dynamics of the fluid through the density-density correlation functions, one can introduce modes, which can be thought of as the different channels by which the correlations decay in time. Some modes are propagating, in the sense that they describe propagating, and damped, …
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Low Energy Excitations of 1D Fermi Gases
… directly, which in turn tells us about the density-density and spin-density correlations in the system. Utilizing the extreme tunability of cold atom experiments, we can study different regimes of these 1D Fermi gases. In particular, moving on from our previous investigations in the …
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Investigating the relationships between land use characteristics, public transport network features and financial viability at a corridor scale
… in four land use characteristics (population density, density distribution, land use mix and destination accessibility) and two public transport network features (mode technology and service configuration) on the financial viability of services. The corridor operating cost model consists of …
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Construction of first-principles density functional approximations and their applications to materials
Kohn-Sham density functional theory is a rigorous formulation of many-electron quantum mechanics which, for practical purposes, requires approximation of one term in its total energy expression: the exchange-correlation energy. This work elucidates systematic methods for constructing approximations …
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Racial residential segregation in the Kansas City area: a comparative study between Blacks and Hispanics
… analysis is based on (1) gradients of density, density growth population growth, and linguistic isolation gradients, and (2) an analysis of city and county areas. It is found that the cultural framework is very useful in analyzing differences between blacks and Hispanics and …
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Green's functions methods for justifying quasi-particle models
… self-energy and the incoherent part of the density-density correlation function may be generated as functional derivatives of a generalized thermodynamic potential (~), together with local translational and rotational invariance and Galilean relativity, leads to a transformation from the …
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A Landscape Approach to Grassland Bird Conservation in the Prairie Pothole Region of the Northern Great Plains
… from the landscape, or both, increase songbird density. Density of many species is positively related to amount of grassland at the smallest scale evaluated (0.5km2), but large grasslands are vital for others whose density is related to grassland abundance at large scales (32km2). At local …
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A Landscape Approach to Grassland Bird Conservation in the Prairie Pothole Region of the Northern Great Plains
… from the landscape, or both, increase songbird density. Density of many species is positively related to amount of grassland at the smallest scale evaluated (0.5km2), but large grasslands are vital for others whose density is related to grassland abundance at large scales (32km2). At local …
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The structure and mechanical behavior of bamboo and bamboo products
… are developed and explored, with a focus on density. Density is a practical parameter: it corresponds to weight, and places bamboo in the broader context of cellular solids. Bamboo tissue is made up of parenchyma and vascular bundles, consisting of sclerenchyma fibers and vessels; the …
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Non-Equilibrium Disordering Processes In binary Systems Due to an Active Agent
… is not conserved, being related to the density of corrupted bits ρ. Using both continuum theory and computer simulations, we study the average density of corrupted bits, and the associated density-density correlation function, as well as several other related quantities. In the second …
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Totally Asymmetric Simple Exclusion Processes with Finite Resources
… approaches. We explore how the average overall density, density profile, and current change as a function of the number of particles initially in the reservoir for various parameters. New features arise not seen in the ordinary TASEP model, even for a single TASEP connected to the pool of …
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