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Showing 1 to 20 of 90 for “"order parameters"”.
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Measurements of segmental order parameters and torsional angles in solid state nuclear magnetic resonance
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1998.
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Investigation of superconducting order parameters in heavy-fermion and low-dimensional metallic systems under pressure
… sensitivity of the system to external tuning parameters like doping, pressure or magnetic field. The exploration of superconductivity proved to be a fascinating and challenging scientific undertaking. Discovered by H. Kammerlingh Onnes in 1911, prior to the development of the quantum theory of …
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Equilibrium phase separation with many conserved order parameters - Analytical theory and applications in biomolecular condensation
… theory of phase separation with many conserved order parameters, with a particular focus on applying new insights to understand membraneless organelles formed by proteins. There, the relevant order parameters are concentrations of various solute components, and the large number of interacting …
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Synchrotron X-ray scattering studies of novel phase transitions in systems with coupled order parameters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Simultaneous extraction of order parameters and orientational distribution fuctions from 31[superscript]P NMR spectra of magnetically partially oriented phospholipid bilayers
Order parameter profiles extracted from the NMR spectra of model membranes are a valuable source of information about their structure and molecular motions. To al1alyze powder spectra the de-Pake-ing (numerical deconvolution) ~echnique can be used, but it assumes a random (spherical) dist.ribution …
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X-ray study of the ordering phase transition at the Cu3Au (111) surface
… question of surface behavior near a bulk first order phase transition. We have studied three aspects of the phase transition: the surface order parameters, the order parameter fluctuations and the ordering kinetics. We found that close to the transition temperature, the surface ordering is …
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Ubiquitin Conformational Dynamics and Hydration Shell Dynamics by Solid State NMR
… protein site-specific amplitude of motions (order parameters) using 2H-13C CP correlation experiments and tested this method on the amino acid model compounds and ubiquitin microcrystalline samples. The ubiquitin backbone order parameters we obtained are very similar to the previously …
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Static and Dynamical Properties of Ferroelectrics and Related Material in Bulk and Nanostructure Forms
… in the coexistence of two or more magnetic order parameters in the same structure. Understanding the physics behind such coupled magnetic order parameters is of obvious benefit for the sake of control of the magnetic properties of such systems. We employ both the effective Hamiltonian and …
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Spatial Organization of Multicellular Living Systems
… based on these local structures, and extract two parameters, namely the volumetric and shear order parameters, that are reflective of the transitions of local order in the systems. Theoretically, these two parameters form a complete and unique pair of signatures for the local structural order of a …
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Theoretical Studies of the Solvation, Dynamics, and Photochemistry of Ethylene, Retinal Protonated Schiff Base, Oligocellulose, and Gd(III) Clusters
… the series, with experimentally determined order parameters (S 2) ranging from 0.30 to 0.52 and computationally determined S 2 values of 0.40 to 0.73. Together experiment and simulation indicate that each glycosidic linkage becomes much more rigid as the oligosaccharide increases in length.
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Dielectric and electro-optical properties of some cyanobiphenyl liquid-crystals
… anisotropy of polarisabilities and order parameters of three liquid crystal homologs (5CB, 6CB, and 7CB), 60CB and three eutectic nematic mixtures E7, E8, and E607 were calculated using optical and density data measured at several temperatures. The order parameters calculated using …
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Electronic instabilities and the Martensitic transition in A-15 compouns
… wave (CDW) transition involving electronic CDW order parameters coupled to phonon coordinates. Pretransition elastic anomalies, softening of the [llOJ transverse ([110J polarized) phonon, sublattice distortions, variation of transition temperature with stress and alloying and other effects have …
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Fabrication and applications of fluorescent polymer fibres
… A method was developed to manufacture ordered arrays of nanofibers through the use of a static parallel plate system alongside a top plate. This method was found to produce fibres with greatly increased order parameters compared to those from a flat collection plate. Narrower gaps …
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Competitive Nucleation in Nanoclusters
… formation of icosahedral structures is about an order of magnitude higher than the rates for other structures. Also, as the size of the cluster increased, the rate of formation of icosahedral structure decreased while that of decahedral and FCC structures increases. The MPMLA is applied to the …
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Development of Kirkwood-Buff derived force field for phospholipids
… models for lipids, we present force field parameters for the study of 8 glycerophospho lipids in water. The force field parameters for the polar groups of lipids (head groups, glycerol, ester functionalities) were developed to reproduce the experimental Kirkwood-Buff (KB) integrals for …
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The Kitaev Model on Surfaces with Lattice Defects and of Higher Genus
… be organised or, in other words, the different orders of the system. Landau had the insight that the difference between two phases can be attributed to the corresponding orders having different symmetries [1]. Also, the transition between phases can be associated with the breaking of symmetries. …
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Radiomic Analysis of Sonograms for the Detection of Tendon Damage
… tendon US images appear darker and more disordered. One drawback to previous in vivo studies, however, is the large variation of higher order statistics between US images, likely due to changes in ultrasound transducer operation or patient positioning. To circumvent these limitations, …
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In-Medium QCD Sum Rules for omega Meson, Nucleon and D Meson
… the chiral symmetry group and the relation to order parameters of spontaneous chiral symmetry breaking are outlined. In this respect, also the QCD condensates appearing in differences of sum rules of chiral partners are investigated. Finally, the effects of an ambient nuclear medium on the D …
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Theory of the general orientation dependence of ²H NMR spin-lattice relaxation and experiments on model membranes
… It involves a sum of spherical harmonics up to order four: 1P = E E aoT(,3, a) ,p even Tz P=0 q=,-p where T, represents T1z, TiQ and T2 and the aP9 depend on reduced spectral densities and spherical order parameters which are independent of the orientation of the magnetic field. Tiz and T1Q …
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The one-dimensional spin-1/2 ANNNI model in non-commuting magnetic fields
… fields were then developed in each of the four ordered regions. Order parameters and the associated susceptibilities as well as specific heats were calculated. By application of the finite-size scaling technique it was possible to obtain the phase boundaries of the model numerically. For certain …
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