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 10 of 10 for “"multipole expansion"”.
-
Response of periodic systems to electromagnetic fields: multipole expansion, microscopic charge-current density, polarization and magnetization
… emitted by them. The methods are based on the multipole expansion of charge-current distributions and on its extensions to account for the motion of charges between lattice sites. In the first part of this thesis I treat the optical response of 2d nanoparticle arrays, with the focus on …
-
Measurement of the dipion mass spectrum in the decay X(3872) [right arrow] J/ [psi] [pi]⁺ [pi]⁻ at the CDFII experiment
… X(3872) dipion mass spectrum is compared to QCD multipole expansion predictions for various charmonium states, as well as to the hypothesis [right arrow] J/ [psi] po. We find that the measured spectrum is compatible with 3S1 charmonium decaying to J/ [psi] [pi]⁺ [pi]⁻ - and with the X(3872) - …
-
Error Sensor Placement for Active Control of an Axial Cooling Fan
… noise from an axial cooling fan, which may have multipole characteristics. A more complete characterization of fan noise may be obtained using a procedure based on the work of Martin and Roure [J. Sound Vib. 201 (5), 577--593 (1997)]. Pressure values are obtained over a hemisphere in the far …
-
Fast simulation methods for soft matter hydrodynamics
… and are methodically improved by introducing the multipole expansion and constraints on particle dynamics. Ewald sum splitting, which decomposes the sum of slowly decaying interactions into two rapidly decaying sums evaluated indepently in real space and Fourier space, is used to accelerate the …
-
Large Scale Simulations of Brownian Suspensions
… hydrodynamic interactions using a far-field multipole expansion combined with a near-field lubrication correction. The breakthrough O(N ln N) scaling is obtained by employing a Particle-Mesh-Ewald (PME) approach whereby near-field interactions are evaluated directly and far-field interactions …
-
Optical Modeling And Analysis Of Disordered Plasmonic Nanoparticle Ensembles
… nanoparticle packing on two length scales. Multipole expansion of different types and the effective medium approximation will be extensively used to establish models describing the effective optical properties of these systems as an ensemble average. Various analytical and numerical …
-
Trapped-modes, slow light and collective resonances in metamaterials
… to the eigenmodes of the unit cell winding. Multipole expansion of the resonant current configurations indicates a dominant electric dipole-magnetic dipole contribution to gyrotropy followed by electric dipole-electric quadrupole order effects, while a non-negligible toroidal response …
-
Orbital And Spin Angular Momentum Light Generation, Interactions, Special Photons, And Applications In Liquids, Solids, Vapors And Biological Tissue Media
… chiral and non-chiral materials, where upon the multipole moment of the light (OAM) and the material affect the strength of the light matter interaction These interpretations will help to understand and expand our future work on the quantum mechanical effect of SAM and OAM involving the selection …
-
Bacterial motility and growth in open and confined environments
… theory) or model the swimming microorganism by a multipole expansion to account for the flow field interaction between cell and boundary. An accumulation of swimming bacteria near solid boundaries has been observed in similar experiments. Our results confirm that collisions with the surface play …
-
Computer simulation and theoretical prediction of thermally induced polarisation
In this thesis, we study the phenomenon of thermally induced polarisation using a combination of theory and computer simulation. Molecules of sufficiently low symmetry exhibit thermo-molecular orientation when subjected to a temperature gradient, leading to considerable electrostatic fields in …