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 114 for “"scattering experiments"”.
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Study of atomic scale dynamics of glass-forming metallic liquids using neutron scattering experiments and molecular dynamics simulations
… atomic-scale dynamics using experimental neutron scattering techniques and computational molecular dynamics simulations accompanied by machine learning. Specifically, this work focuses on identifying a key crossover point that marks the onset of glassy behavior in the liquid state from both …
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Study of microscopic structure via NMR diffusive scattering
Scattering experiments can be carried out by gradient nuclear magnetic resonance(NMR) methods. Magnetic field gradient pulses are utilized to create linear phase ramps of the spin magnetization across the sample along arbitrary directions. The linear phase ramps are defined as dynamic spin …
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Fast Sound Propagation in Binary Fluid Mixtures
… of binary mixtures are light and neutron scattering. To connect the dynamics with scattering experiments one can use the kinetic theory of fluids. I have applied the kinetic theory to binary mixtures where the atomic masses of the molecules of the two components are very different …
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Energy Transfer Dynamics in Collisions of Polar and Non-polar Gases with Functionalized Self-Assembled Monolayers
Molecular beam scattering experiments are used to investigate the extent of thermal accommodation of Ne, CD4, ND3, and D2O in collisions with long chain CH3, NH2, and OH terminated self-assembled monolayers (SAMs) on gold. Surface rigidity, internal degrees of freedom of the impinging gas, and …
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High Pressure Light Scattering Studies of Dense Fluids (Collision, Induced, Lineshape)
High pressure light scattering experiments are a powerful tool for probing the density dependence of both molecular motion and intermolecular interactions. This thesis describes high pressure light scattering studies of the vibrational relaxation of the nitrate ion in aqueous solutions of sodium …
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Counterion Distribution around a Macroion in Polyelectrolytes Probed by Anomalous Small-Angle X-ray Scattering
… carried out using Anomalous Small Angle X-ray Scattering (ASAXS) in order to probe the counterion correlation around the macroion. In the course of this study, different polyelectrolyte systems such as, rod-like polyelectrolytes, spherical polyelectrolyte brushes and star shaped …
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Experimental study of physical-chemical factors in the sol-gel process
… (multinuclear NMR, Raman, small angle neutron scattering, fluorescence polarization, viscosity, turbidity, static and dynamic light scattering experiments) have been employed to investigate the nature of the sol-gel process of tetramethyl orthosilicate; Si(OCH$\sb3$)$\sb4$; TMOS. These …
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Elaboration of micelle formation in aqueous and two phase solutions by surface active phosphines
… in aqueous solution to form micelles. Light scattering experiments were used to determine the hydrodynamic radius of the aggregates. Fluorescence, conductivity, and surface tension experiments were used to measure the critical micelle concentration of these aggregates. Fluorescence …
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The Role of Solvent in the Protein Dynamical Transition
… using molecular dynamics simulations and neutron scattering experiments.
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Dynamic proton polarization in some rare earth ethyl sulphates
… for use as a polarized proton target for nuclear scattering experiments. Preliminary results on (Er, Y)ES at 9.5 Gc/sec showed several features that prohibit high proton polarizations. An anomalous behavior was observed in o 167 (Er, Y)E,:S at 2.0 K du~ to the overlap of one of the Er hyperfine …
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Designing a nanoscale x-ray source: towards single molecule x-ray scattering
… The X-ray source is designed for X-ray scattering experiments, which will ultimately allow the imaging of single biomolecules. Such experiments will require an intense, focused X-ray beam. Towards this aim, this thesis demonstrates focusing techniques based on tapered capillary optics, …
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Physics of liquid crystals embedded in silica gels
… been studied by means of high resolution X-ray scattering experiments. The silica particles form a hydrogen-bonded fractal gel network that introduces quenched disorder. As a result, the nematic to smectic-A transition is replaced by the growth of static short range smectic correlations. The …
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The ground state of liquid helium-four
… good agreement with the X-ray and neutron scattering experiments
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An experimental investigation of organized structure and mixing in compressible turbulent free shear layers
… employed to image the large structures. Both Mie scattering from condensed ethanol droplets and laser-induced fluorescence from seeded nitric oxide were used. The LIF experiments were utilized to avoid potential particle dynamics effects associated with the Mie scattering experiments. Sizeable …
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A complex of interactions in rare-earth based quantum honeycomb magnets
… heat capacity, and inelastic neutron scattering experiments, this work systematically explores the magnetic phase behavior of Yb2Si2O7 and ErCl3, two rare-earth compounds with effective spin-1/2 degrees of freedom on geometrically frustrated lattices. The first part of this …
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Scattering of acoustic energy from rough deep ocean seafloor: A numerical modeling approach
… causing the reverberation in sonar and seafloor scattering experiments, we have developed numerical simulation techniques that are capable of modeling the principal physical properties of complex seafloor structures. A new viscoelastic finite-difference technique for modeling anelastic wave …
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Phonon Dispersion Relations in Chrystals
Inelastic neutron scattering experiments can provide much information about the thermal motions in solids and liquids. Neutrons which have been thermalised by the moderator of a nuclear reactor have energies similar to those associated with these thermal motions. It so happens that they also have …
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Parity-Violating Elastic Electron Nucleon Scattering: Measurement of the Strange Quark Content of the Nucleon and Towards a Measurement of the Weak Charge of the Proton
The experiments discussed in this thesis exploit parity violation in elastic electron proton scattering in order to measure properties of the nucleon. Both experiments make use of the high quality, highly polarized electron beam available at Thomas Jefferson National Accelerator Facility. …
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Automating methods to improve precision in Monte-Carlo event generation for particle colliders
… theoretical description of high energy particle scattering experiments. It focuses on fixed order perturbative calculations, i.e. on matrix elements and scattering cross sections at leading and next-to-leading order. For the leading order a number of algorithms for the matrix element generation …
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Liquid State Theory of Equilibrium Structure and Thermodynamics of Block Copolymer Melts and Solutions
… via the calculation of small and wide angle scattering patterns, real space intermolecular radial distribution functions, and length-scale dependent effective compositions. The dependence of such properties on multiblock architecture, backbone stiffness, composition and block length, relative …
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