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Showing 1 to 20 of 111 for “"periodic structures"”.
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Response of periodic structures
Periodic structures are defined as structures consisting of identical substructures connected to each other in identical manner. In chapter I, the response of periodic structures to harmonic excitation is described by a matrix difference equation. The solution of the matrix difference equation can …
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Localization in disordered periodic structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Investigation of resonators loaded periodic structures
… new features of left handed materials, many structures such as split rings resonators (SRR) have been proposed in the literature to artificially fabricate radio frequency and microwave components. Due to their bulk properties, periodic arrays of SRRs provide a negative permeability. Therefore …
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Random vibrations of mistuned periodic structures
Nearly periodic structures exhibit localized modes of vibration depending upon the ex· tent of the coupling and the disorder between their periodic components. These localized modes may cause excessive vibration amplitudes resulting in significantly higher stresses than the ones the structures …
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Optimal mode localization in disordered, periodic structures
Periodic structures which are slightly disordered undergo dramatic changes in mode shapes such that the responses go from being spatially extended to spatially localized. This phenomenon called mode localization, offers an excellent option for passive vibration isolation. In the first part of the …
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Optimal mode localization in disordered, periodic structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Probabilistic vibration analysis of nearly periodic structures
The localization of modes of nearly periodic structures causes a concentration of energy in one part of the mode shape. It occurs for a disordered structure with weakly coupled subsystems. The forced excitation of localized modes may affect the maximum response amplitude of the system. Two nearly …
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Nonlinear Periodic Structures: From Classical to Quantum Devices
In this thesis, nonlinear periodic structures and their applications in both classical and quantum regime are investigated. New theoretical models are developed, and novel applications of nonlinear periodic structures are proposed and demonstrated. The theoretical studies, both design and …
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Numerical methods in wave propagation in periodic structures
… a computer oriented study in wave propagation in periodic structures.</p> <p class="MsoNormal">A simple introduction is first provided to review the concept of propagation constant and to lay down the basic terminology and ideas for subsequent development.</p> <p class="MsoNormal">A general matrix …
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Electromagnetic Eigensolvers Tailored for Glide-Symmetric Periodic Structures
L'abstract è presente nell'allegato / the abstract is in the attachment
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Guided modes and resonant transmission in periodic structures
… scattering phenomena of scalar fields in periodic slab and pillar structures that are related to the interaction between guided modes of the structure and plane waves emanating from the exterior. The mechanism for the resonance is the nonrobust nature of the guided modes with respect to …
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Radiation from relativistic electron beams in periodic structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Radiation From Some Periodic Structures Excited by a Waveguide
Made available in DSpace on 2014-12-08T22:23:51Z (GMT). No. of bitstreams: 1 6604209.pdf: 1770930 bytes, checksum: 8d6726af8d26a549fe381590e240aef3 (MD5) Previous issue date: 1965
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Interaction of Modulated Electron Beams With Open Periodic Structures
Made available in DSpace on 2014-12-08T22:24:07Z (GMT). No. of bitstreams: 1 6706688.pdf: 4476343 bytes, checksum: 2b46b3138ee16f0118b653cb9da9ab46 (MD5) Previous issue date: 1966
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Fabrication and Dynamic Tuning of Periodic Structures From Holographic Lithography
… two-dimensional (2D) and three-dimensional (3D) periodic structures through holographic lithography (HL) and backfilling conversion with different materials. Along the line, I investigated their intrinsic structure-property relationship, harness and utilize the mechanical instability, and …
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Analysis of periodic structures using finite-difference time-domain method
Periodic structures are of great importance in electromagnetics these days due to their wide range of applications such as frequency selective surfaces (FSS), electromagnetic band gap, periodic absorbers, metamaterials and many others. The aim of this work is to develop several algorithms to …
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Modeling and design of near-field antennas with periodic structures
… this dissertation, the one- and two-dimensional periodic structures are modelled and adopted in the design of near-field antennas. First, the discontinuous Galerkin time-domain (DGTD) method is applied to model the scattering from periodic structures. The modelling of dispersive media is …
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Linear and nonlinear resonance of water waves near periodic structures
… well-known that near an infinite linear array of periodically spaced cylinders trapped waves of certain eigen-frequencies can exist. If there are only a finite number of cylinders in an infinite sea, trapping is imperfect. Simple harmonic incident waves can excite a nearly trapped wave at one of …
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Floquet-Wave-Based Analysis of Transient Scattering From Doubly Periodic Structures
"In the past, transient scattering from doubly periodic structures has been analyzed predominantly using finite difference time domain methods. Unfortunately, for obliquely excited periodic structures, these solvers call for future field values to update current ones, and therefore cannot be …
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