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 50 for “"critical behavior"”.
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Structure and critical behavior of polymer gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Critical behavior and transport properties of lanthanum manganite
… this assumption we can reproduce the anomalous behavior of the heat capacity.
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Magnetic and superconducting quantum critical behavior of itinerant electronic systems
… being (i) the mode-coupling effects and (ii) the behavior in the presence of disorder. We devote two projects of this dissertation to each of the two."--Abstract, page iv.
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X-ray scattering study of the critical behavior of binary liquid crystal mixtures
Thesis (Ph.D.)--M.I.T, Dept. of Physics, 1981.
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Magnetic and critical behavior of thin terbium(0001)/tungsten(110) films studied by electron capture spectroscopy (ECS)
… and exhibits strongly non-monotonic behavior close to 245 K. Novel critical behavior is observed near T$\sb{\rm C\sb s}$, suggesting strong surface anisotropies, in accord with a recently predicted and previously unobserved surface phase transition.
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X-ray scattering study of the critical behavior of the second harmonic in the density wave system 7APCBB
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Computational and Experimental Investigation of the Critical Behavior Observed in Cell Signaling Related to Electrically Perturbed Lipid Systems
Problem Statement: The use of pulsed electric fields (PEFs) as a tumor treatment modality is receiving increased traction. A typical clinical procedure involves insertion of a pair of electrodes into the tumor and administration of PEFs (amplitude: ~1 kV/cm; pulse-width: 100 μs). This leaves a zone …
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Critical behavior of the n-vector and charged n-vector models from an exact solution to the screening approximation
Within the screening approximation the n-vector model can be solved exactly. Results for the high temperature phase are presented here. For 1arge n there is the expected agreement with the 1/n expansion results while for small n we explore the nonexistence of a solution in the regime of spatial …
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Specific heat of the order-disorder transition in beta-brass and its relation to the Ising Model
… interactions has no appreciable effect on the critical behavior of beta-brass's specific heat. The Cv results provide no verification of the ""scaling-law"" prediction a = a'. However, the Cp data do suggest the possibility of a' assuming its true critical behavior only ~ close to the critical …
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Studies in random Ising spin systems
… exponent. We also find unexpectedly different critical behavior for different bond distributions. A simple renormalization-group calculation is applied to the twodimensional random-bond Ising model with non-zero-mean bond strength. Our result fails to confirm McMillan's result that there are …
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Observations in Lipid Membrane Systems
… are addressed when the membrane is viewed as a critical system. Previous work using giant plasma membrane vesicles (GPMVs) used this framework to explain the dynamics of the rafts. We intended to show critical behavior as a factor for cell signaling. Critical behavior was not easily ascertained …
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Disorder at first-order classical and quantum phase transitions
… just as in the classical case. The resulting critical behavior depends on the strength of the inter-color coupling in the quantum Ashkin- Teller model. This leads to two different regimes, the weak and strong coupling regimes, both of which feature infinite-randomness critical behavior but in …
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Heat capacity measurements of yttrium barium(2)copper(3)oxygen(7-delta) near T(c): Fluctuation effects in a bulk superconductor
… YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-\delta}$ near the critical temperature are reported and discussed. The samples are high-quality single crystals, several of which display untwinned regions making up at least 50% of the sample mass. The heat capacity data show a cusp-like anomaly instead of the …
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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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Steady State Properties of Some Driven Diffusive Systems
… a better understanding of the properties and critical behavior of non-equilibrium systems, we investigate the steady state properties of three simple models, variations of the prototype, the driven Ising lattice gas. Our first system studied is the bilayer model, a stack of two driven Ising …
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Phase coherence in the regime of bilayer exciton condensation
… The tunneling experiments revealed a critical behavior and an I/V curve reminiscent of the Josephson effect of superconductivity.
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Surface magnetic order of ultra thin epitaxial vanadium films on silver
… temperature T$\sb{\rm cs}$ = 475.1 K, and the critical behavior of the magnetization of the films is identical to that predicted by the well-known two-dimensional Ising Model of ferromagnet.
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… measure the static and dynamic pretransition behavior of the nematic-smectic A phase transition of the liquid crystal CBOOA. The first experiment is a conventional Rayleigh light scattering measurement performed with excellent temperature control of the liquid crystal. The second is a novel …
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Neutron scattering and magnetization studies of the spin correlations on the kagomé lattice antiferromagnet KFe₃(Oh)₆(SO₄)₂
… on which measurements are performed, the critical behavior of the system can belong to either SO(2) or Z2 universality classes with two distinct critical temperatures; one is associated with the spontaneous breaking of the Z2 symmetry, and the other corresponds to a topological order (BKT …
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