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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 53 for “"dispersion relations"”.
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Dispersion Relations for Hyperon-Decay
Made available in DSpace on 2015-05-12T17:12:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6206190.PDF: 2270382 bytes, checksum: 793e00b3a77d570cbaf52b2205e16bf7 (MD5) Previous issue date: 1962
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Phonon Dispersion Relations in Chrystals
… a single crystal enables us to deduce the phonon dispersion relation, that is the frequency of the normal modes as a function of their wave vectors. These experiments provide a far more direct test of theories of crystal dynamics than do specific heat measurements. The possibility of experimental …
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Photon decay rate of sigma plus from unsubtracted dispersion relations
Taking the viewpoint of unsubtracted dispersion relations we derive integral representations for the weak photon decay amplitudes Fl and F2. The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering …
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Resonance and double negative behavior in metamaterials
… sub-wavelength structures. The branches of the dispersion relation associated with Bloch modes are shown to be explicitly determined by the Dirichlet spectrum of the high dielectric phase and the generalized electrostatic spectra of the complement. For numerical purposes, we consider a …
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Size-binary Zincblende: A Colloidal Approach to Omnidirectional Photonic Bandgaps
… of binary colloidal crystals affect the photonic dispersion relations. Zincblende structures are targets for binary colloidal assembly since they are closely related to well-known photonic crystal structures such as diamond cubic and inverse opal. In this investigation, we model zincblende with a …
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Model-independent approaches to QCD and B decays
… the form factor shape is constrained using QCD dispersion relations. Theory error is dominated by the input points, with negligible uncertainty from the dispersion relations.
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Generalized phononic networks : of length scales, symmetry breaking and (non) locality : "controlling complexity through simplicity"
… we show how we may explicitly control the dispersion relations of a phononic metamaterial in order to obtain a desired final band structure. Some of our demonstrations include a new polychromatic phononic metamaterial which possesses multiple complete in-plane spectral gaps totaling over …
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Suppressions and cascades : insights from gauge/gravity dualities
… I use the AdS/CFT correspondence to study the dispersion relations of mesons in a particular hot, strongly coupled, supersymmetric gauge theory plasma. This plasma arises by placing a probe D7-brane in the near-horizon geometry of non-extremal D3-branes. I find the large momentum dispersion …
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Harmonic generation and parametric excitation in a beam-plasma system
… in a cold beam-plasma system. The dispersion relations for plasma and ion-acoustic waves are calculated. Coupling constants for harmonic generation and parametric excitation are calculated and the equations for the wave amplitudes are solved numerically for some important cases. …
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ATOMISTIC MODELING OF PHONON BANDSTRUCTURE AND TRANSPORT FOR OPTIMAL THERMAL MANAGEMENT IN NANOSCALE DEVICES
… predominantly uses empirically fitted phonon dispersion relations as input to determine the properties of phonons so as to predict the thermal conductivity of specified material geometry. The empirically fitted dispersion relations assume harmonic approximation thereby failing to account for …
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Applications of computer algebra to the theory of electron energy loss
… obtained <i>closed form</i> solutions for the dispersion relations of surface and interface plasmons and for the angle-resolved energy-loss function. The energyloss spectrum is then obtained by integrating over wavevectors. The formulas we have derived are applied to real materials such as …
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Photophysics of carbon nanotubes
… dramatic changes in their electron and phonon dispersion relations due to the curvature of the nanotube sidewall and the enhanced electron correlation effects associated with one dimensionality. The optical transition energies in small-diameter carbon nanotubes show a strong dependence on their …
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Charged scalar fields and superconductivity in AdS4/CFT3.
… plots. From these we are able to determine the dispersion relations for the field. I shall also find pseudo-particle masses at zero momentum, and consequently see the lowest energy bound which a particle in this field can adopt.
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Bound states in a system of two vector mesons
… to the forces between two p-mesons. Using dispersion relations techniques, we look for s-wave bound states between two such particles. vIe find three bound states in the 1.2 BeV region. These have the IJ PG assignments: 02++, 11++ and 00'1-+, \ve identify the f and the B .. resonances with …
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Breaking symmetries in ordered materials : spin polarized light transport in magnetized noncentrosymmetric 1D photonic crystals, and photonic gaps and fabrication of quasiperiodic structured materials from interference lithography
… symmetries were shown to display nonreciprocal dispersion relations, and to exhibit a remarkable set of symmetry-related properties. Even in 1D, these materials are found to display indirect photonic band gaps, backward wave propagating modes (antiparallel phase and group velocities) which …
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Investigation of model micro-scale reconnecting plasma modes
… magnetic islands. We derive the model dispersion equation, which closely follows the derivation of the micro-reconnecting mode dispersion equation [1], under relevant conditions using the drift kinetic approximation. We also consider the dispersion relation in the fluid limit [1]. We …
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Intense spreading of radar echoes from ionospheric plasmas
… Rayleigh-Taylor instability. A derivation of the dispersion relations for X and O mode waves transmitted from an ionosonde and an analysis of the collisional Rayleigh-Taylor instability leading to an expression for the growth rate are presented as background information. Ray tracing code developed …
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Ultrasonic circumferential waves in empty and water-filled tubes
… are theoretically and experimentally studied. Dispersion relations of different circumferential modes, including the SH-type and Lamb-type families, are obtained by solving the wave equations numerically. Asymptotic solutions are also given for the SH-like modes. Various technologies are …
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Plasma line generation and spectral estimation from Arecibo Observatory radar data
… with electron density waves with the governing dispersion relations of Langmuir and ion-acoustic waves, respectively. Such ISR spectral measurements can be conducted at the Arecibo Observatory, one of the most important centers in the world for research in radio astronomy, planetary radar and …
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