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Showing 1 to 20 of 32 for “"Critical Exponents"”.
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Topics in Lattice Statistics: I. Systematics of Multilayer Adsorption Phenomena on Attractive Substrates. Ii. Dynamical Critical Exponents for the Kinetic Ising Model: A Finite-Size Hamiltonian Calculation
This thesis consists of two parts. The first and major part is contained in Chapter I and deals with multilayer adsorption and wetting phenomena on attractive substrates. The second part, contained in Chapter II, is devoted to the study of kinetic Ising models, using finite-size Hamiltonian methods.
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Topics in Lattice Statistics: I. Systematics of Multilayer Adsorption Phenomena on Attractive Substrates II. Dynamical Critical Exponents for the Kinetic Ising Model: A Finite-Size Hamiltonian Calculation
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2011-06-02T17:26:09Z No. of bitstreams: 1 1982_pandit.pdf: 5769733 bytes, checksum: 3cf1cd189904f2a0b5ccbc3238ccdebc (MD5)
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Estudo das propriedades críticas do processo epidêmico por par com difusão de pares
… percolation class), but with anomalies in the critical spreading dynamics. An infinite number of absorbing configurations arise in the PCP because all process (creation and annihilation) require a nearest-neighbor pair of particles. The diffusive pair contact process - PCPD) was proposed by …
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Percolation behavior of diffusionally evolved two-phase systems simulated using phase field methods
… to investigate the percolation threshold and critical scaling exponents of randomly assembled composites. However many materials are non-random as a result of correlations that are introduced during processing. This work seeks to address this case by studying the percolation behavior of …
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Monte Carlo analysis of non-equilibrium steady states and relaxation kinetics in driven lattice gases
… periodic boundary conditions below and at the critical temperature using Monte Carlo simulations of very large lattices in two dimensions. This work is one of few that explores the relaxation to a non-equilibrium steady state. We obtain data collapse for the finite-size scaling form of …
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Scaling and Pattern Formation in Condensed Matter Systems
… behavior in driven ferromagnetic, are observed. Critical exponents are extracted from power laws extending over 5 decades. I extend the PFC model to accommodate actual atomic configurations and vacancies. I use the extended PFC model to simulate a liquid and reproduce the correct form of the …
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Application of renormalization-group techniques to random magnetic systems
… stable in the next order; we have also obtained critical exponents to one higher order. Next, position-space techniques are used to study some simple model systems. In addition to critical exponents, global thermodynamic properties are determined. These calculations are based on the …
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Heat capacity of gadolinium near the Curie point
… fits are obtained fora range of values of the critical exponents alpha (above Tc) and alpha' (below Tc )' the choice of which depends on the choice of Tc The entire set of data, including that in the rounded region, fits an expression derived from a simple macroscopic model of rounding. The Tc …
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… millikelvin temperature resolution and yield critical exponents for the elastic constants and the twist viscosity coefficient. These results are inconsistent with the three proposed theories of the critical behavior at least in the simple form in which the theories were first proposed and …
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Exotic phases and quantum criticality in gapless correlated electron systems
… a specific type of transition which produces critical exponents agreeing with neutron scattering experiments on LSCO. Secondly, for a Pomeranchuk transition where an electronic nematic order parameter develops we present a controlled expansion within which the physics of such a transition, and …
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The heat capacity of ammonium chloride near the order-disorder transition
… electrostatic interaction. The critical exponents a+ and a are found to be in the neighborhood of .7, which is quite different from. the predictions of Ising model calculations.
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The thermal expansion of ammonium chloride near the order-disorder transition
… especially near the transition. Values of the critical exponents alpha+ and alpha- range from about .80 to .97, This is in striking disagreement with theoretical calculations using the Ising model.
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Random surfaces and the Yang-Lee edge singularity
… review a recently devised method to infer the critical exponents of conformal field theories coupled to the fluctuating metric. Chapter 3 explains a complimentary discrete approach involving sums over random graphs which reproduces essentially the results of the continuum methods. The author's …
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Methods for the analysis of thermomagnetic phase transitions of magnetocaloric materials
… phase transitions, such as Curie temperature, critical exponents (even in biphasic systems), order of the phase transition and critical composition for which rst order phase transition becomes second order. These analyses were performed in well know materials such as Gd, Gd5Si2Ge2, La(Fe,Si)13, …
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Two-Dimensional Discrete Gaussian Model at High Temperature
… study scaling phenomena, in particular computing critical exponents and proving scaling limits and universality. We study the central limit theorem in three different regimes, first on macroscopic scale, second on mesoscopic scale and the third on microscopic scale. The first two amount to …
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Speciation dynamics of an agent-based evolution model in phenotype space
… case. By demonstrating that the populations near criticality collapse to universal scaling functions with appropriate critical exponents, this case is shown to belong to the directed percolation universality class. Finally, lineage behavior is explored for both organisms and clusters. The lineage …
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High-temperature critical indices for the classical anisotropic Heisenberg model
… many phase transitions (as characterized by the critical exponents) there are, and which features of the dynamics and kinematics of a given system determine the dritical exponents. A diagrammatic expansion for the Slpin-spin correlation function is derived and renormalized. The resulting form of …
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Studies of thermal and transport properties of the isostructural family of rubidium silver iodide
… study of the properties associated with the critical phenomena of these systems. These measurements were made on single crystals grown from solution. Diffused silver contacts were used as electrodes, considerably minimizing contact effects. It was found that Cp and dR/dT exhibit very similar …
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The effects of disorder on superconducting islands and island arrays
… in the system, we observed an evolution of critical exponents and a crossover from a possible vortex glass to a likely Griffiths-type phase to a percolative-driven transition for devices having resistances less than the quantum of resistance R_Q.
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Spin Systems far from Equilibrium: Aging and Dynamic Phase Transition
… Ising ferromagnets. We also study the local critical phenomena at a dynamic phase transition by means of numerical simulations of kinetic Ising models with surfaces subjected to a periodic oscillating field. We examine layer-dependent quantities, such as the period-averaged magnetization per …
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