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 89 for “"polarizability"”.
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Dynamic polarizability and collective modes in narrow-band electron systems
The family of moiré materials, in particular the magic angle twisted bilayer graphene, has emerged recently as a platform to study strongly interacting physics. This thesis analyzes the impact of the ultranarrow Bloch bands and strong electron-electron interactions on the dynamical polarization …
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Electric neutron polarizability and eigenspectrum subtraction techniques for disconnected quark loops.
… neutron in order to obtain the neutron electric polarizability. Neutron electric polarizability can be studied by implementing a static electric field on the lattice. The implementation of this field, though, is non-trivial and the "proper" form for lattice implementation is studied and the …
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Thermodynamics of Buried Water in Protein Cavities and Revised Algorithms for Introducing Polarizability to Molecular Dynamics Simulations
… to the fluctuating charge algorithm that handles polarizability in molecular dynamics simulations were performed to allow for longer time steps. The fluctuating charge model treats partial charges as variables which are propagated using Lagrangian dynamics. A coordinate transform to normal mode …
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Photon scattering from 16O above the giant dipole resonance
… E2 strength and to measure the electric polarizability (a) and magnetic polarizability ({l) of a nucleon bound in 160. We find that there are no significant compact E2 resonances within the energy range of this experiment, although the data suggest that an E2 strength greater than 0.5 …
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Theoretical studies at the interface of atomic physics and precision measurements
… requires accurate knowledge of transition polarizability. In Cesium, the $6S_{1/2}\rightarrow{7S_{1/2}}$ APV amplitude, $\mathrm{Im(E_{PNC})}$ is deduced from the measured ratio $\mathrm{Im(E_{PNC})}/\beta$ of the APV amplitude to the vector transition polarizability, $\beta$. %Ideally, the …
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Particle Manipulation Via Optical Forces and Engineering Soft-Matter Systems With Tunable Nonlinearities.
… optical forces, either by tailoring particle polarizability, and/or by structuring the incident light field. As a simple example, a tightly focused laser beam demonstrates strong gradient forces, which may attract and even trap particles with positive polarizability in the focal volume. The …
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Nonlinear electrokinetics of the bacterial cell envelope for applications in biomicrofluidics
… we model the direct current (DC) electric field polarizability of two strains of Streptococcus Salivarius bacteria - fibrillated and unfibrillated, which differ in their cell envelope appendage (soft layer) properties. Using the Poisson-Nernst-Planck equations for ion transport and Stokes …
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Computational Modelling of Nanoscale Interactions for Nanophotonics and Biosensing
… a model to investigate solvent effects on the polarizability of Ångstrom-sized amino acids. Molecular polarizability serves as a molecular fingerprint that is encoded in the biosensor signals. Our model builds on existing methods in density functional theory to calculate molecular …
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Migration and separation in structured microfluidic systems
… not changeable on the fly), the usually unknown polarizability properties of samples for dielectrophoretic manipulation and the requirement of a specifically designed chiral selector for chiral separation. 1) Typical biotechnological separation techniques like filters, chromatography, or gel …
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Interpretation of Infrared and Raman Spectra Using Driven Molecular Dynamics Method
… molecular dynamics (MD) method. Additionally, polarizability driven molecular dynamics method is employed to assign prominent vibrational modes beyond the constraint of the harmonic approximation. These methods are applied to the benchmark systems CH<sub>4</sub>, …
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Electrical-phenotyping of the bacterial envelope using microfluidics
… on bacterial envelopes change their surface polarizability-an intrinsic dielectric property-in a manner that can be distinguished by microfluidic dielectrophoresis (DEP). The three-dimensional insulator-based dielectrophoresis (3DiDEP), a microfluidic technique previously reported by our …
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Coulomb drag in quantum Hall systems near v = 1/2
… use Boltzmann transport theory to determine the polarizability of the composite fermions. While this approach works at filling fraction v = 1/2, a straight-forward expansion of the solution of the Boltzmann equation around v = 1/2 results in spurious divergences that stem from inaccuracies in the …
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Synthesis and Characterization of Mixed-Metal Phosphonates For Polymer Dielectric Composite Materials
… The affect of the cation's size and polarizability, as well as the polarizability of the pendant organic group was investigated with regards to the resulting dielectric constant of the AB(RPO3)3-PS composites.</p>
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Measuring atomic properties with an atom interferometer
… The second experiment measures atomic polarizability with an atom interferometer. Here, the interaction is with an electric field; the atom experiences a phase shift proportional to its energy inside the field. Previously, this method was used to perform the most accurate (< 1%) …
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Developing Fast and Accurate Water Models for Atomistic Molecular Dynamics Simulations
… of point charges, as well as adding electronic polarizability, are two common strategies for accuracy improvements. Both strategies come at considerable computational cost, which weighs heavily against modest possible accuracy improvements in practical simulations. With a careful comparison …
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Machine Learning Models in Fullerene/Metallofullerene Chromatography Studies
… on conformations. In this thesis, I propose the polarizability of a fullerene molecule is able to be estimated directly from the structures. Structural motifs are used to simplify the model and the models with motifs provide satisfying predictions. The data set contains 31947 isomers and their …
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Dielectric and Kerr Effect Studies of Electro-Active Polymer Complexes
… were attributed to either increases in polarizability and/or increases in the anisotropy of polarizability of the complexes. The effects of exaltation on the magnitudes of the molar Kerr constants have also been considered. Kerr effect and dielectric studies have also been carried out on …
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Compton scattering from the deuteron at intermediate energies
… the deuteron were studied in the context of the polarizability of the neutron. We have measured the elastic and quasi-elastic cross sections for the scattering of tagged photons from a liquid deuterium target at $E\gamma$ = 50 MeV and scattering angles of 50$\sp\circ$, 75$\sp\circ$, 110$\sp\circ$ …
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Application of molecular mechanics polarization to fragment based drug design.
… excluded from almost all virtual screening. Polarizability helps explain interactions between nonpolar atoms and electrically charged species. When studying fragments in FBDD these minor interactions could have large effect in changing how well a ligand will bind to its target. After …
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Nonlinear optical properties of chiral media.
… of the electrostatic field. The sum-frequency polarizability and the electric field-induced sum-frequency polarizability interfere and their contributions to the scattering power can be distinguished. Experiments are described where, symmetry permitting, the third-harmonic is generated …
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