Topic
Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
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TL;DR: In this article, the optical modes in a dielectric slab are considerably changed by replacing the metal medium on one side of the slab by a metal, and the results are in satisfactory agreement with theory.
82 citations
82 citations
TL;DR: This work analyzes EM resonance in slabs of two-phase dielectric photonic crystal materials using boundary-integral projections for time-harmonic electromagnetic (EM) fields, and presents numerical examples which demonstrate the effects of structural defects on the resonant properties of a crystal slab and surface waves supported by a die...
Abstract: Using boundary-integral projections for time-harmonic electromagnetic (EM) fields, and their numerical implementation, we analyze EM resonance in slabs of two-phase dielectric photonic crystal materials. We characterize resonant frequencies by a complex Floquet--Bloch dispersion relation $\omega = W(\beta)$ defined by the existence of a nontrivial nullspace of a pair of boundary-integral projections parameterized by the wave number $\beta$ and the time-frequency $\omega$. At resonant frequencies, the crystal slab supports a source-free EM field. We link complex resonant frequencies, where the imaginary part is small, to resonant scattering behavior of incident source fields at nearby real frequencies and anomalous transmission of energy through the slab. At a real resonant frequency, the source-free field supported by the slab is a bound state. We present numerical examples which demonstrate the effects of structural defects on the resonant properties of a crystal slab and surface waves supported by a die...
82 citations
TL;DR: In this paper, a 3D numerical model of the boundary between the Pacific and North American plates in Alaska was constructed to investigate the relative control of flat slab subduction, continental scale faulting, and a nonlinear rheology on deformation in the overriding plate.
82 citations
TL;DR: In this paper, a model for analyzing the shear-lag effect in composite beams with flexible shear connection is proposed, which is based on the virtual work theorem for three-dimensional bodies.
Abstract: Taking into account the long-term behavior of the concrete, this paper proposes a model for analyzing the shear-lag effect in composite beams with flexible shear connection. By assuming the slab loss of planarity described by a fixed warping function, the linear kinematics of the composite beam is expressed by means of four unknown functions: the vertical displacement of the whole cross section, the axial displacements of the concrete slab and of the steel beam, and the intensity of the warping (shear-lag function). A variational balance condition is imposed by the virtual work theorem for three-dimensional bodies, from which the local formulation of the problem, which involves four equilibrium equations with the relevant boundary conditions, is achieved. The assumptions of linear elastic behavior for the steel beam and the shear connection and of linear viscoelastic behavior for the concrete slab lead to an integral-differential type system, which is numerically integrated. The numerical procedure, based on the step-by-step general method and the finite-difference method, is illustrated and applied to a composite beam to get information on the complex time-dependent behavior, including shear-lag and connection deformability effects.
82 citations