The convergence of Galerkin finite element approximations electromagnetic eigenproblems modelling cavity resonators is studied. Since the operator involved noncompact, first part analysis carried out in terms specific definition that known to be appropriate for this case. Then, a slightly stronger proposed, which tuned features practitioner numerical simulation devices requires good computational model resonant cavity. For both definitions, necessary and sufficient conditions are introduced...

Abstract In this paper the photobiomodulation on isolated mitochondria of bovine liver is studied as a thermodynamic process conversion energy. This analysis conducted by considering particular set-up for experiments interest. It allows, in particular, computation electromagnetic field and related energetic quantities stimulated organelles. The measurements excess biochemical power density produced illuminated are performed at regular time intervals after experiments. calculations finally...

In this correspondence, the achievable rates of so called “multiple-input multiple-output interference channel,” exploited by a couple single antenna primary terminals and two cognitive radios under specific constraints, are analyzed. particular, assuming perfect channel state information at terminals, closed form expression for linear precoding reception scheme, which guarantees to meet no mutual between is obtained. Numerical results regarding effects different fading channels an imperfect...

An exact solution to the electromagnetic scattering by a dielectric multilayer infinite cylinder of elliptic cross section is proposed. The interfaces between different media, which are assumed be lossless and nonmagnetic, confocal cylinders. Starting from series expansions in terms Mathieu functions, an efficient recursive procedure for computation fields radar sections per unit length under transverse-magnetic illumination developed. mathematical formulation detailed some numerical results...

Genetic algorithms (GAs) are well-known optimization strategies able to deal with nonlinear functions as those arising in inverse scattering problems. However, they computationally expensive, thus offering poor performances terms of general efficiency when compared inversion techniques based on deterministic methods. In this paper, a parallel implementation an procedure suitable hybrid genetic algorithm is presented. The proposed strategy aimed at reducing the overall clock time order make...

A boundary value problem for the time harmonic Maxwell system is investigated through a variational formulation which shown to be equivalent it and well-posed if only original is. Different bianisotropic materials metamaterials filling subregions of domain with Lipschitz continuous boundaries are allowed. Well-posedness finite element approximability proved by Lax–Milgram Strang lemmas class material configurations involving metamaterials. Belonging this not necessary, yet, well-posedness...

The paper studies the application of a global optimization procedure to detection buried inhomogeneities. object inhomogeneities are schematized as multilayer infinite dielectric cylinders with elliptic cross sections. An efficient recursive analytical is used for forward scattering computation. A functional constructed in which field expressed series solution Mathieu functions. Starting input scattered data, iterative minimization performed by new method called memetic algorithm.

Purpose – To provide sufficient conditions for existence, uniqueness and finite element approximability of the solution time‐harmonic electromagnetic boundary value problems involving metamaterials.

Electromagnetic inverse scattering techniques are considered to reconstruct the permittivity and velocity profiles of axially moving cylindrical targets. Two approaches proposed. One these is based on a two-step procedure. It shown that it provides good approximations be reconstructed in very efficient way, when peak small with respect speed light vacuum. These features obtained by neglecting movement first step, which devoted reconstruction geometric dielectric properties The second...

Although photons have been repeatedly shown to affect the functioning of nervous system, their effects on neurotransmitter release never investigated. We exploited in vitro models that allow involving neuron-astrocyte network be detected (mouse cerebrocortical slices) and dissected these at nerve endings astrocyte processes. Infrared light proved able induce glutamate by stimulating glutamatergic endings.

In this paper, we propose a new microwave technique for the localization and dielectric characterization of physically inaccessible cylindrical objects from amplitude-only data. By means neural network used to solve inverse scattering problem; allows directly achieve object retrieval, avoiding drawbacks related measurement phase distribution field that generally represent critical point, especially at high frequency. The efficiency proposed in reconstruction both position properties circular...

In this paper, we present an inverse scattering approach based on a neural network technique for the detection of dielectric targets buried in lossy half-space. particular, focus attention analysis capability to localize given cylinder starting from known values electromagnetic scattered field evaluated at number points near half-space interface. The robustness developed is firstly tested by considering target and/or scenario characterized parameters different those used during training...

By using an inductive procedure we prove that the Galerkin finite element approximations of electromagnetic eigenproblems modelling cavity resonators by elements any fixed order either Nedelec's edge family on tetrahedral meshes are convergent and free spurious solutions. This result is not new but proved under weaker hypotheses, which fulfilled in most engineering applications. The method proof new, instead, shows how families spurious-free can be systematically constructed. tools here...

This paper presents results on the electromagnetic field computed inside isolated mitochondria when they are exposed to near-infrared illuminations with reference photobiomodulation experiments. The accurate calculation of dose is considered be important for a better understanding mechanism interaction light these organelles and improve reliability repeatability To get such results, we introduce several models. Even though refer well-defined experimental setup, different models necessary...

It is shown that users of frequency-domain numerical simulators should be warned the danger using models with adjacent complementary media since such a configuration materials can cause instability which cannot overcome by presence other lossy or absorbing boundary conditions. The physical realizability at any frequency considering sharp interfaces then questioned contradiction between deduced result and one holds true when actual dielectric structure metamaterials considered.

It is shown that the presence of double negative metamaterials can affect traditional well posedness time-harmonic electromagnetic boundary value problems, even when absorbing conditions are considered on part boundary. This done by considering a simple waveguide discontinuity problem with impedance two ports. The theoretical results then used to introduce some doubts reliability models sharp interfaces between lossless positive and materials, latter constructed arrangements normal...

A new exact solution to the problem of scattering electromagnetic waves from multilayer elliptic cylinders moving in axial direction is proposed. The homogeneous media different layers are assumed be linear and isotropic their rest frames. All that not at with respect host medium are, moreover, supposed have an electric conductivity equal zero (in frames). Starting fact a can treated as stationary bianisotropic one, we deduce series expansions terms Mathieu functions for fields layers. Then,...

Journal Article Regularity of time-harmonic electromagnetic fields in the interior bianisotropic materials and metamaterials Get access Paolo Fernandes, Fernandes Istituto di Matematica Applicata e Tecnologie Informatiche, Consiglio Nazionale delle Ricerche, Via De Marini 6, I-16149 Genoa, Italy Search for other works by this author on: Oxford Academic Google Scholar Marina Ottonello, Ottonello Department Biophysical Electronic Engineering, University Opera Pia 11a, I-16145, Mirco Raffetto *...

Recently, the growing success of new wireless applications and services has led to overcrowded licensed bands, inducing governmental regulatory agencies consider more flexible strategies improve utilization radio spectrum. To this end, cognitive represents a promising technology since it allows exploit unused resources. In context, spectrum sensing task is one most challenging issues faced by radio. It consists an analysis environment detect resources which can be exploited radios. paper,...

A set of sufficient conditions for the well-posedness and convergence finite element approximation two-dimensional time-harmonic electromagnetic boundary value problems involving non-conducting moving objects with stationary boundaries is provided first time to best authors's knowledge. The splits into two parts. these made up traditional conditions, which are not restrictive practical applications define usual requirements domain, its boundary, subdomains their boundaries, constitutive...

A recursive solution for the computation of two-dimensional Green's function multilayer elliptic cylinder is reported. It based on scattering by this canonical scatterer through eigenfunction expansions in terms Mathieu functions. The paper reports mathematical details approach as well several validation tests and comparisons.

Abstract In this paper, we analyze the performances of three‐dimensional finite element (FE) simulators in handling electromagnetic scattering problems involving metamaterials. It has already been proved that FE method are worse than usual, when metamaterials considered. work, extend our previous analysis by providing some additional results on precision solution and iterative direct solvers typically used with simulators. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett...

The growing number of new emerging wireless standards is creating regulatory problems in allocating the unlicensed frequencies. A possible solution for increasing frequency re-usage within framework info-mobility cellular systems joint exploitation Smart Antennas and Cognitive Radio. In paper a Mode Identification algorithm, based on distribution features multiple neural network classifiers, Base Transceiver Station presented. Simulated results, obtained simplified framework, will prove...