An Active High Impedance Surface for Low Profile Tunable and Steerable AntennasIn this letter, an approach for designing a tunable and steerable antenna is presented. The antenna model is based on a wideband bow-tie radiating element mounted above an active Artificial Magnetic…Filippo Costa, Agostino Monorchio, Salvatore Talarico et al.·Jan 18, 2009SaveLearn
Magnetic influence on classical dispersionWe discuss the Lorentz model for dispersion and absorption of radiation in dilute, linear and isotropic materials. Initially, with the purpose of making the paper as self-contained as possible, we…T. N. C. Mendes, Reinaldo de Melo e Souza, C. Farina·Jan 14, 2009SaveLearn
Thermal Radiation Effect in the Free Expansion of an Ideal Gas and Gibbs' Paradox in Classical ThermodynamicsThe standard theory of ideal gases ignores the interaction of the gas particles with the thermal radiation (photon gas) that fills the otherwise vacuum space between them. This is an unphysical…A. Paglietti·Jan 13, 2009SaveLearn
A non-linear hardening model based on two coupled internal hardening variables: formulation and implementationAn elasto-plasticity model with coupled hardening variables of strain type is presented. In the theoretical framework of generalized associativity, the formulation of this model is based on the…Nelly Point, Silvano Erlicher·Jan 11, 2009SaveLearn
Bouc-Wen-type models with stiffness degradation: thermodynamic analysis and applicationsIn this paper, a thermodynamic analysis of Bouc-Wen models endowed with both strength and stiffness degradation is provided. It is based on the relationship between the flow rules of these models and…Silvano Erlicher, Oreste S. Bursi·Jan 11, 2009SaveLearn
Pseudo-potentials and loading surfaces for an endochronic plasticity theory with isotropic damageThe endochronic theory, developed in the early 70s, allows the plastic behavior of materials to be represented by introducing the notion of intrinsic time. With different viewpoints, several authors…Silvano Erlicher, Nelly Point·Jan 11, 2009SaveLearn
On the derivation of structural models with general thermomechanical prestressThe vibrating behaviour of thin structures is affected by prestress states. Hence, the effects of thermal prestress are important research subjects in view of ambient vibration monitoring of civil…Silvano Erlicher, F. Bourquin·Jan 11, 2009SaveLearn
Synthèse sonore de la clarinette avec modèle de résonateur à trous latéraux optimisé sur des impédances d'entrée d'une clarinette réelleSound synthesis can be developed using physics-based modelling of the musical instruments. These methods need the description of the various parts of sound production mechanism, in particular a model…Fabrice Silva, Philippe Guillemain, Jean Kergomard et al.·Jan 10, 2009SaveLearn
Lateral vibration of footbridges under crowd-loading: Continuous crowd modeling approachIn this paper, a simple 1D crowd model is proposed, which aim is to properly describe the crowd-flow phenomena occurring when pedestrians walk on a flexible footbridge. The crowd is assumed to behave…Joanna Bodgi, Silvano Erlicher, Pierre Argoul·Jan 10, 2009SaveLearn
Relativistic Entropy and Related Boltzmann KineticsIt is well known that the particular form of the two-particle correlation function, in the collisional integral of the classical Boltzmman equation, fix univocally the entropy of the system, which…G. Kaniadakis·Jan 8, 2009SaveLearn
A bead on a hoop rotating about a horizontal axis: a 1-D ponderomotive trapWe describe a simple mechanical system that operates as a ponderomotive particle trap, consisting of a circular hoop and a frictionless bead, with the hoop rotating about a horizontal axis lying in…Andrew K. Johnson, James A. Rabchuk·Jan 7, 2009SaveLearn
The covariant formulation of Maxwell's equations expressed in a form independent of specific unitsThe covariant formulation of Maxwell's equations can be expressed in a form independent of the usual systems of units by introducing the constants alpha, beta and gamma into these equations.…Jose A. Heras, G. Baez·Jan 1, 2009SaveLearn
Rigorous treatment of electrostatics for spatially varying dielectrics based on energy minimizationA novel energy minimization formulation of electrostatics that allows computation of the electrostatic energy and forces to any desired accuracy in a system with arbitrary dielectric properties is…O. I. Obolensky, T. P. Doerr, R. Ray et al.·Dec 31, 2008SaveLearn
Quasistatic behavior and force transmission in packing of irregular polyhedral particlesDense packings composed of irregular polyhedral particles are investigated by numerical simulations under quasistatic triaxial compression. The Contact Dynamics method is used for this investigation…Émilien Azema, Farhang Radjaï, Gilles Saussine·Dec 30, 2008SaveLearn
An alternative to relativistic transformation of special relativity based on the first principlesA new relativistic transformation in the velocity space (here named the differential Lorentz transformation) is formulated solely from the principle of relativity and the invariance of the speed of…Young-Sea Huang·Dec 30, 2008SaveLearn
Derivation of the self-interaction force on an arbitrarily moving point-charge and of its related energy-momentum radiation rate: The Lorentz-Dirac equation of motion in a Colombeau algebraThe classical theory of radiating point-charges is revisited: the retarded potentials, fields, and currents are defined as nonlinear generalized functions. All calculations are made in a Colombeau…Andre Gsponer·Dec 29, 2008SaveLearn
The exact relation between the displacement current and the conduction current: Comment on a paper by Griffiths and HealdI introduce the exact relation between the displacement current ε0 ∂ Ě/∂ t and the ordinary current vJ. I show that ε0 ∂ Ě/∂ t contains a local term determined by…Jose A. Heras·Dec 28, 2008SaveLearn
Author's responseThis paper replies to the comment by Jefimenko: "Causal equations for electric and magnetic fields and Maxwell's equations: Comment on a paper by Heras" [Am. J. Phys. 76, 101-101…Jose A. Heras·Dec 28, 2008SaveLearn
Can Maxwell's equations be obtained from the continuity equation?We formulate an existence theorem that states that given localized scalar and vector time-dependent sources satisfying the continuity equation, there exist two retarded fields that satisfy a set of…Jose A. Heras·Dec 28, 2008SaveLearn
Reply to "Comment(s) on `Preacceleration without radiation: The non-existence of preradiation phenomenon," by J. D. Jackson [Am. J. Phys. 75, 844-845 (2007)] and V. Hnizdo [Am. J. Phys. 75, 845-846 (2007)This paper replies the comments by J. D. Jackson [Am. J. Phys. 75, 844-845 (2007)] and V. Hnizdo [Am. J. Phys. 75, 845-846 (2007)].Jose A. Heras·Dec 27, 2008SaveLearn
Simultaneous inference of Jefimenko's and Maxwell's equations from retardationAssuming the idea of retardation as an underlying axiom, we investigate how Jefimenko's and Maxwell's equations can be inferred. In the inference, we begin with the retarded versions of…J. -M. Chung·Dec 26, 2008SaveLearn
Multipole radiation fields from the Jefimenko equation for the magnetic field and the Panofsky-Phillips equation for the electric fieldWe show how to obtain the first multipole contributions to the electromagnetic radiation emited by an arbitrary localized source directly from the Jefimenko equation for the magnetic field and the…R. de Melo e Souza, M. V. Cougo-Pinto, C. Farina et al.·Dec 26, 2008SaveLearn
Mossbauer Experiment in a Rotating System on the Time Dilation EffectWe present results of Moessbauer experiment in a rotating system, which is induced by our recent disclosure (Phys. Scr., 77 (2008) 035302) and which consisted in the fact that a correct processing of…Alexander L. Kholmetskii, Tolga Yarman, Oleg V. Missevitch et al.·Dec 24, 2008SaveLearn
The Coulomb static gaugeThe existence of gauge conditions involving second-order derivatives of potentials is not well known in classical electrodynamics. We introduce one of these gauges, the Coulomb static gauge, in which…Jose A. Heras·Dec 24, 2008SaveLearn
Unified Statistical Description of Quasithermodynamic Systems in and out of EquilibriumWe propose the method of statistical description of broad class of dynamic systems (DS) whose equations of motion are determined by two state depending functions: 1) "energy" - the quantity…E. D. Vol·Dec 19, 2008SaveLearn