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Classical Physics papers — page 180

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Modeling and Analysis of Composite Antenna Superstrates Consisting on Grids of Loaded Wires
We study the characteristics and radiation mechanism of antenna superstrates based on closely located periodical grids of loaded wires. An explicit analytical method based on the local field approach…
Pekka Ikonen, Elena Saenz, Ramon Gonzalo et al.Jan 3, 2007
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Effect of Elasticity of Shafts, Bearings, Casing and Couplings on the Critical Rotational Speeds of a Gearbox
The aim of this study is to analyse the influence of the mechanical characteristics of the set of components on the critical rotational speeds of a gearbox. The case of a gearbox fitted out with a…
Emmanuel Rigaud, Jean SabotJan 3, 2007
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Experiments and numerical results on nonlinear vibrations of an impacting hertzian contact. Part 2: random excitation
Non linear dynamic behaviour of a normally excited preloaded Hertzian contact (including possible contact losses) is investigated using an experimental test rig. It consists on a double sphere plane…
Joël Perret-Liaudet, Emmanuel RigaudJan 3, 2007
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Experiments and numerical results on nonlinear vibrations of an impacting hertzian contact. Part 1: harmonic excitation
The purpose of this paper is to investigate experimental and numerical dynamic responses of a preloaded vibro-impacting Hertzian contact under sinusoidal excitation. Dynamic response under random…
Emmanuel Rigaud, Joël Perret-LiaudetJan 3, 2007
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Multipole structure and coordinate systems
Multipole expansions depend on the coordinate system, so that coefficients of multipole moments can be set equal to zero by an appropriate choice of coordinates. Therefore, it is meaningless to say…
Lior M. BurkoJan 2, 2007
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Instantaneous fields in classical electrodynamics
In this paper we express the retarded fields of Maxwell's theory in terms of the instantaneous fields of a Galilei-invariant electromagnetic and we find the vector function whose spatial and…
Jose A. HerasDec 30, 2006
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Comment on 'A generalized Helmholtz theorem for time-varying vector fields by A. M. Davis, [Am. J. Phys. 74, 72-76 (2006)]'
In a recent paper Davis formulated a generalized Helmholtz theorem for a time-varying vector field in terms of the Lorenz gauge retarded potentials. The purposes of this comment are to point out that…
Jose A. HerasDec 30, 2006
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Preacceleration without radiation: the non-existence of preradiation phenomenon
An unexpected prediction of classical electrodynamics is that a charge can accelerate before a force is applied. We would expect that a preaccelerated charge would radiate so that there would be…
Jose A. HerasDec 30, 2006
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The falling chain of Hopkins, Tait, Steele and Cayley
A uniform, flexible and frictionless chain falling link by link from a heap by the edge of a table falls with an acceleration g/3 if the motion is nonconservative, but g/2 if the motion is…
Chun Wa Wong, Seo Ho Youn, Kosuke YasuiDec 29, 2006
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Derivation of the potential, field, and locally-conserved charge-current density of an arbitrarily moving point-charge
The complete charge-current density and field strength of an arbitrarily accelerated relativistic point-charge are explicitly calculated. The current density includes, apart from the well-established…
Andre GsponerDec 23, 2006
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Effect of an original gear mesh modelling on the modal behaviour of gear transmission
Prediction of the vibroacoustic behaviour of geared transmissions is generally based on determining the excitation sources, the overall modelling of the transmission, the modal analysis and the…
Emmanuel Rigaud, Joël Perret-Liaudet, Mohamed-Salah MecibahDec 22, 2006
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Relativistic momentum and kinetic energy, and E=mc2
Based on relativistic velocity addition and the conservation of momentum and energy, I present derivations of the expressions for the relativistic momentum and kinetic energy, and E=mc2.
Ben Yu-Kuang HuDec 21, 2006
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Relativistic addition of perpendicular velocity components from the constancy of the speed of light
Mermin [Am. J. Phys. 51, 1130--1131 (1983)] derived the relativistic addition of the parallel components of velocity using the constancy of the speed of light. In this note, the derivation is…
Ben Yu-Kuang HuDec 20, 2006
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Nonlinear management of the angular momentum of soliton clusters
We demonstrate an original approach to acquire nonlinear control over the angular momentum of a cluster of solitary waves. Our model, derived from a general description of nonlinear energy…
Andrea Fratalocchi, Armando Piccardi, Marco Peccianti et al.Dec 18, 2006
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Fluctuation theorem for entropy production during effusion of an ideal gas with momentum transfer
We derive an exact expression for entropy production during effusion of an ideal gas driven by momentum transfer in addition to energy and particle flux. Following the treatment in Phys. Rev. E Vol.…
Kevin Wood, C. Van den Broeck, R. Kawai et al.Dec 17, 2006
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Stability of Vertical Steady Rotation of an Ellipsoid On a Smooth Horizontal Plane
The article treats the classical problem of stability of steady rotation of a rigid homogeneous ellipsoid on a rigid smooth plane which rotates about its vertical axis. The condition for the steady…
Milan BatistaDec 13, 2006
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Octonionic Electromagnetic and Gravitational Interactions and Dark Matter
Based on Maxwellian quaternionic electromagnetic theory, the electromagnetic interaction, gravitational interaction and their coupling influence with the dark matter field in octonionic space are…
Zihua WengDec 12, 2006
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The locally-conserved current density of the Lienard-Wiechert field
The complete charge-current density and field strength of an arbitrarily accelerated relativistic point-charge are explicitly calculated. That current includes, apart from the well-established…
Andre GsponerDec 10, 2006
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Electromagnetic shape resonances of a dielectric sphere and radiation of portable telephones
The frequency band used by cellular telephones includes the eigenfrequencies of a dielectric sphere with physical characteristics close to those of a human head. Proceeding from the spatial features…
V. V. Nesterenko, A. Feoli, G. Lambiase et al.Dec 8, 2006
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Eight Minutes and a Half
In this paper we describe a simple conceptual problem, regarding the actual position of the Sun at sunset or sunrise. Although this problem can be easily explained in terms of rotating frames of…
Gabriele U. VarieschiDec 8, 2006
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Broadband radial discone antenna: Design, application and measurements
The wide band of frequencies that includes all those allocated to 2G/3G applications was defined as 2G/3G band and the discone antenna with a structure of radial wires was defined as radial discone.…
N. I. Yannopoulou, P. E. Zimourtopoulos, E. T. SarrisDec 5, 2006
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Differential Error Region of a Quantity Dependent on Full One-Port Network Analyser Measurements
An analytical method was developed to estimate errors in quantities depended on full one-port vector network analyser (VNA) measurements using differentials and a complex differential error region…
N. I. Yannopoulou, P. E. ZimourtopoulosDec 5, 2006
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Classical Electromagnetism as a Consequence of Coulomb's Law, Special Relativity and Hamilton's Principle and its Relationship to Quantum Electrodynamics
It is demonstrated how all the mechanical equations of classical electrodynamics (CEM) may be derived from only Coulomb's inverse square force law, special relativity and Hamilton's…
J. H. FieldDec 4, 2006
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A remark on an ansatz by M.W. Evans and the so-called Einstein-Cartan-Evans unified field theory
M.W.Evans tried to relate the electromagnetic field strength to the torsion of a Riemann-Cartan spacetime. We show that this ansatz is untenable for at least two reasons: (i) Geometry: Torsion is…
Friedrich W. HehlDec 3, 2006
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Mixed Reality States in a Bidirectionally Coupled Interreality System
We present experimental data on the limiting behavior of an interreality system comprising a virtual horizontally driven pendulum coupled to its real-world counterpart, where the interaction time…
Vadas Gintautas, Alfred HublerNov 29, 2006
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