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 44 for “"Structure Factor"”.
-
On the dynamic structure factor for the electron gas
… path integral version, then studied its dynamic structure factor S(q,q0 ) systematically. Our study shows that qc defined in RPA not only is the threshold for a bare plasmon, but also in general the one for any number of renormalized plasmons. We have particularly studied large momentum transfer …
-
Studies of structure and dynamics of biological macro-molecular assemblies by low angle neutron diffraction and inelastic X-ray scattering
… parts which focus on the studies of the dynamic structure factor and static inter-particle structure factor respectively. In the first part, we have measured and analyzed the dynamic structure factors of aligned 40 wt% calfthymus Na-DNA molecules with the inelastic X-ray scattering (IXS). In the …
-
Mean-field theory for the dynamics of superfluid fermions in the BCS-BEC crossover
… The second one is to calculate the dynamic structure factor of unitary fermions. We have studied the dynamic structure factor of unitary fermions both at zero and finite temperature using the Bogoliubov-de Gennes theory and also Superfluid Local Density Approximation. We have derived the …
-
Dynamical correlations of S=1/2 quantum spin chains
… I present a study of the longitudinal dynamical structure factor for the XXZ model in the critical regime. I show that an approximation for the line shape of the dynamical structure factor in the limit of small momentum transfer can be obtained by going beyond the Luttinger model and treating …
-
Caracterização estrutural, dinâmica e reológica de suspensões coloidais via simulação molecular
… (Radial Distribution function (RDF) and Structure Factor), dynamical (diffusion coefficient and viscosity) and rheological (G0 and G00 ) properties under different conditions. The validation and tests of these algorithms are made by comparing with literature results of a LennardJones …
-
Deep inelastic neutron scattering and single particle kinetic energies in condensed noble gases
… Laboratory was used to measure the dynamic structure factor at values of the wave-vector transfer between 15 and 30 A$\sp{-1}$. Data have been analyzed with resolution techniques, and the single particle kinetic energies have been determined.
-
Extended-Range Oscillations and the First Sharp Diffraction Peak in Amorphous Silicon: A Systematic Study
… peak (FSDP), which characterizes the static structure factor of many glassy systems near the wave vector region of 1-2 Å<sup>-1</sup> has been observed depending on the temperature, pressure and the degree of annealing of the system. The presence of the FSDP is indicative of the intermediate …
-
Niobium-Tantalum Superlattices Grown by Molecular Beam Epitaxy: Structure, Transport, and Superconducting Properties
… wavelength in metallic superlattices. X-ray structure factor determinations of superlattices grown in four different crystal orientations found that interfacial alloying was strongly direction dependent. The extent of intermixing was larger than predicted by simple diffusion, indicating …
-
Shear behavior and microstructures of confined colloidal suspensions
Rheological properties and microstructures of concentrated charge-stabilized suspensions confined to gap sizes on the order of a few particle diameters are investigated by molecular dynamics computer simulations. Suspensions of uniform spheres at volume fractions ranging from 0.28 to 0.53 covering …
-
The ground state of liquid helium-four
… is 20% above the experimental value. The liquid structure factor and the two-particle correlation function are in reasonably good agreement with the X-ray and neutron scattering experiments
-
A calculation of the ground-state energy of liquid Helium II
… of the parameters was chosen to satisfy a liquid-structure-factor consistency condition. The expectation value for the ground state energy is expressed in terms of a generalized normalization integral. To evaluate the 3-N fold integrals, the normalization integral is approximated by truncating its …
-
On the Structure and Dynamics of Aluminophosphate Glass-forming Melts measured by Dynamic Light Scattering
… to investigate how the change in the chemical structure of covalent network affects its dynamics. The dynamic structure factor was measured to provide quantitative information about the liquid's dynamics through the non-ergodic level, stretching exponent, and fragility. The fragility was shown …
-
Nonzero temperatures and emergent disorder in spin liquids
… measurable finite temperature dynamical structure factor. I then look at the propagation of quasiparticles in a different context: Classical spin ice. When spin ice is subjected to rapid cooling, the density of excitations (monopoles) form long-lived metastable plateaux as a result of the …
-
Hydrolysis of aluminum in synthetic cation exchange resins and dioctahedral vermiculite
… dioctahedral vermiculite were carried out using structure factor calculations, one dimensional fourler synthesis, and difference synthesis. Structure factor calculation for the dioctahedral vermiculite studied indicate that the ratio of the intensities of diffraction maxima corresponding to 7 A …
-
Analysis of dislocation pipe diffusion in deformed alpha-phase PdHX using a synthesized QENS approach
… developed for accurately comparing the dynamic structure factor S_inc(Q,E) data of multiple instruments, using an inverse Fourier transform in order to obtain the intermediate scattering function F_inc(Q,t) for each instrument and simultaneously analyzing the output from three QENS …
-
A Hardware Generator for Factor Graph Applications
A Factor Graph (FG -- http://en.wikipedia.org/wiki/Factor_graph) is a structure used to find solutions to problems that can be represented as a Probabilistic Graphical Model (PGM). They consist of interconnected variable nodes and factor nodes, which iteratively compute and pass messages to each …
-
Local Magnetism in Strongly Correlated Electron Systems with Orbital Degrees of Freedom
… has many branches, I calculate the dynamic structure factor to find which branches of the spin wave spectrum have the highest intensity. It will be interesting to compare my dynamic structure factor results to single crystal inelastic neutron scattering, which to this point has not been …
-
On the Rayleigh -Brillouin scattering in air
… effects of air molecules, i.e., the scattering structure factor.</p>
-
The role of topological defects and textures in the kinetics of phase ordering
… systems investigated possess a rich homotopy structure of the order-parameter space, which results in numerous topologically stable objects being generated during the quench, and influencing the properties of the system during the subsequent approach to equilibrium. The results reported are …
Page 1 of 3