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.
Results
Showing 1 to 20 of 68 for “"Particle systems"”.
-
Time dependence in fine-particle systems
… interacting ensemble of Stoner-Wohlfarth fine particles has been investigated. The particles typically represent the elongated single domain ferromagnetic particles that have widespread application in the magnetic recording industry. The particle ensemble considered exhibits both orientational …
-
STRONGLY CORRELATED INTERACTING PARTICLE SYSTEMS AND THEIR APPLICATIONS
Strongly correlated interacting particle systems are probabilistic models that describe collections of particles whose behaviors are mutually dependent, typically due to repulsive or attractive forces. These models have long been central to statistical physics, where they are used to describe …
-
Theoretical studies of strongly interacting fine particle systems
… dependent behaviour of a system of fine magnetic particles as a function of applied field and temperature was carried out. The model used was based on a theory assuming Neel relaxation with a distribution of particle sizes. This theory predicted a linear variation of 5max with temperature and a …
-
Linear and non-linear collisionless many-particle systems
… stability results for collisionless many-particle systems described by distribution functions satisfying classical kinetic models arising in astrophysics. On the one hand, we study the large time behavior of solutions to the Vlasov--Poisson system, which describes a self-gravitating system …
-
Controlled particle systems for nonlinear filtering and global optimization
… and applications of controlled interacting particle systems for nonlinear filtering and global optimization problems. These problems are important in a number of engineering domains. In nonlinear filtering, there is a growing interest to develop geometric approaches for systems that evolve …
-
Quantitative studies and Hydrodynamical limits for interacting particle systems
… study of microscopic non-equilibrium systems that were first introduced in order to derive macroscopic physical laws such as Fourier's law. In particular the main objective is to determine the scaling of the spectral gap, i.e. the relaxation rate, in terms of the number of the …
-
Modeling Dynamic Objects in Scenes with Generative Particle Systems
… that represents 3D matter as small Gaussians (“particles”) drawn from clusters capturing groups of coherently moving matter. We develop an e!cient inference algorithm based on parallelized block Gibbs sampling to recover stable particle motion and rigid groupings. Our model provides a tractable, …
-
Quantum control of many-particle systems via shortcuts to adiabaticity
… To date preparation and manipulation of quantum systems has primarily been done using adiabatic processes. These adiabatic processes while robust have significant disadvantages such as their requiring long process times, a further drawback is that the system-environment interaction over these …
-
Non-Equilibrium Pattern Formation in Multi-Species Interacting Particle Systems
Non-equilibrium systems can form complex patterns in their steady states. Examples are systems consisting of self-propelled particles or systems consisting of particles driven away from equilibrium by external energy sources. In steady states, the interacting particles spontaneously organise into …
-
Probing the dynamic scaling hypothesis in 1-D coarsening particle systems
… we will investigate two 1-D coarsening dynamical systems, one for which The Dynamic Scaling Hypothesis holds and one for which it does not. This thesis studies, in particular, the coarsening-ballistic particle CBP* model and the coarsening reverse-parabolic CRP** model. We utilize an in-house code …
-
Deterministic and Stochastic Approaches to Relaxation to Equilibrium for Particle Systems
… marginal which are uniform in the number of particles.
-
The two-way street between discrete and continuum models of particle systems
Many systems exhibit behavior across multiple length scales. When modeling the behavior of such systems, simplifying assumptions are commonly made to reduce model complexity while still capturing system behavior accurately at a length scale of interest. However, it can frequently be advantageous to …
-
New methods for the calculation of dynamical properties of many-particle systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
-
Spectral gaps for many-particle systems, semiclassical analysis of graphene, and quantum dynamics
… concerned with spectral gaps of classical many-particle systems, the mean-field O(n) model and the chain of oscillators. We study the optimal constant in the Poincar´e inequality of the associated Gibbs measure. For the mean-field O(n)-model we use renormalization ideas and semiclassical methods …
-
Investigation of efficient geometric shape algorithms for numerical simulation of discrete particle systems
The efficiency of a discrete particle simulation implementation relies on several factors, including the geometric representation, contact resolution, and neighbor-sorting algorithm used. The focus here is on the first two of this list: the geometric representation and the corresponding contact …
-
Numerical Treatment of Schrödinger’s Equation for One-Particle and Two-Particle Systems Using Matrix Method
… of atoms.</p> <p>The test cases include both one-particle and two-particle systems. The singularity poses an issue in the computation by affecting the accuracy of energies and wavefunctions obtained. Higher-order differences and non-uniform meshes are implemented to resolve the issue, but they …
-
Attractive electrostatic self-assembly of ordered and disordered heterogeneous colloids
… was found, demonstrating the need to create particle systems that meet the narrow parameter space where ICCs should be stable. Pair interaction potentials were evaluated for their accuracy using a Poisson-Boltzmann (PB) equation solver. The PB solver was also used to further refine …
-
Explorations of quantum decoherence phenomena
… erasers we explore the stability of three-particle systems under different entangling interactions. With a two-spin system we illustrate the essential features of quantum erasers. The extension to three-spins allows us to use the pair of orthogonal decoherent operations used in quantum …
-
Contributions in fractional diffusive limit and wave turbulence in kinetic theory
… them via mean-field limits of finite stochastic particle systems. $\textbf{Anomalous transport from kinetic models.}$ The goal is to understand how fractional diffusion arises from kinetic equations. We explain how fractional diffusion corresponds to anomalous transport and its relation to the …
Page 1 of 4