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Classical Physics papers — page 143

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Superluminal phase and group velocities: A tutorial on Sommerfeld's phase, group, and front velocities for wave motion in a medium, with applications to the "instantaneous superluminality" of electrons
The concepts of phase, group, and front velocities introduced by Sommerfeld will be reviewed, and applied to superluminal phenomena, with a brief review of optical experiments that evince…
Raymond ChiaoNov 10, 2011
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Generalized electromagnetic energy-momentum tensor and scalar curvature of space at the location of charged particle
We consider the Einstein equation, where the common electromagnetic energy momentum tensor is replaced by its generalized equivalent as suggested in our earlier paper (A.L. Kholmetskii et al. Phys.…
A. L. Kholmetskii, O. V. Missevitch, T. YarmanNov 9, 2011
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Sur une généralisation de l'opérateur fractionnaire
The goal of this communication is to propose a generalized notion of the "traditional derivative". This generalization includes the fractional derivatives such as the Riemann-Liouville,…
Thomas Michelitsch, Gérard Maugin, Shahram Derogar et al.Nov 8, 2011
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Enhanced and reduced transmission of acoustic waves with bubble meta-screens
We present a class of sonic meta-screens for manipulating air-borne acoustic waves at ultrasonic or audible frequencies. Our screens consist of periodic arrangements of air bubbles in water or…
Alice Bretagne, Arnaud Tourin, V. LeroyNov 5, 2011
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Lagrangian mechanics on Lie groups: a pedagogical approach
We describe a new method to formulate classical Lagrangian mechanics on a finite-dimensional Lie group. This new approach is much more pedagogical than many previous treatments of the subject, and it…
A. LucasNov 5, 2011
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Autonomous three dimensional Newtonian systems which admit Lie and Noether point symmetries
We determine the autonomous three dimensional Newtonian systems which admit Lie point symmetries and the three dimensional autonomous Newtonian Hamiltonian systems, which admit Noether point…
M. Tsamparlis, A. Paliathanasis, L. KarpathopoulosNov 3, 2011
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Scattering solution of a ball by a bat
The problem of the mechanical evolution of a shock between a cylindrically symmetric bat and a spherical ball is solved in the strict rigid approximation for arbitrary values of the initial…
Alejandro Cabo, Leon Soler, Carlos GonzalezOct 29, 2011
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Evolution of Plastic Strain During a Flow Forming Process
The distribution of equivalent plastic strain through the thickness of several AISI 1020 steel plates formed under different conditions over a smooth cylindrical mandrel using a single-roller forward…
M. J. Roy, R. J. Klassen, J. T. WoodOct 28, 2011
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Sources, Potentials and Fields in Lorenz and Coulomb Gauge: Cancellation of Instantaneous Interactions for Moving Point Charges
We investigate the coupling of the electromagnetic sources (charge and current densities) to the scalar and vector potentials in classical electrodynamics, using Green function techniques. As is well…
B. J. Wundt, U. D. JentschuraOct 27, 2011
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Anharmonic oscillations of a conical buoy
A study of the foating of a circular cone shaped buoy in an ideal fluid has revealed some new interesting results. Using reduced variables it is shown, that at a crossover value (3/4) of the ratio of…
J. Brochado Oliveira, J. Monteiro Moreira, J. M. Machado da SilvaOct 27, 2011
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Testing for Anisotropy of Space via an Extension of Special Relativity
In special relativity, testing for spatial anisotropy usually means testing for anisotropic propagation of light. This paper explores a different possibility, in which light is still assumed to…
Alon DroryOct 26, 2011
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Contribution to the Modelling of the Corrugated Cardboard Behaviour
The current paper summarizes studies undertaken on the corrugated cardboard. In these studies, a new approach considering the corrugated cardboard as an orthotropic material is developed. This…
Samir Allaoui, Z. Aboura, M. L. BenzeggaghOct 25, 2011
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Transformation Ray Method: Controlling High Frequency Elastic Waves
A transformation method based on elastic ray theory is proposed to control high frequency elastic waves. We show that ray path can be controlled in an exact manner, however energy distribution along…
Zheng Chang, Jin Hu, Xiaoning Liu et al.Oct 24, 2011
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Using surface integrals for checking the Archimedes' law of buoyancy
A mathematical derivation of the force exerted by an inhomogeneous (i.e., compressible) fluid on the surface of an arbitrarily-shaped body immersed in it is not found in literature,…
F. M. S. LimaOct 24, 2011
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Analysis of Woven Reinforcement Preforming using an Experimental Approach
In order to understand the mechanisms involved in the forming step of LCM processes and provide validation date to numerical models, a specific experimental device has been designed in collaboration…
G. Hivet, S. Allaoui, D. Soulat et al.Oct 24, 2011
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Analyse of Woven Reinforcement Preforming by Experimental Approach
An experimental device of dry preform stamping was designed and carried out for the first stage of the RTM process. This tool was developed to test the feasibility to obtain specific double curved…
D. Soulat, S. Allaoui, S. ChatelOct 24, 2011
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Travelling waves near a critical point of a binary fluid mixture
Travelling waves of densities of binary fluid mixtures are investigated near a critical point. The free energy is considered in a non-local form taking account of the density gradients. The equations…
Henri Gouin, Augusto Muracchini, Tommaso RuggeriOct 24, 2011
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On the Derivation of Vector Radiative Transfer Equation for Polarized Radiative Transport in Graded Index Media
Light transport in graded index media follows a curved trajectory determined by the Fermat's principle. Besides the effect of variation of the refractive index on the transport of radiative…
J. M. Zhao, J. Y. Tan, L. H. LiuOct 24, 2011
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Relativistic dynamics of accelerating particles derived from field equations
In relativistic mechanics the energy-momentum of a free point mass moving without acceleration forms a four-vector. Einstein's celebrated energy-mass relation E=mc2 is commonly derived from that…
Anatoli Babin, Alexander FigotinOct 22, 2011
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Maxwell's Demon and Data Compression
In an asymmetric Szilard engine model of Maxwell's demon, we show the equivalence between information theoretical and thermodynamic entropies when the demon erases information optimally. The work…
Akio Hosoya, Koji Maruyama, Yutaka ShikanoOct 21, 2011
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The falling slinky
The slinky, released from rest hanging under its own weight, falls in a peculiar manner. The bottom stays at rest until a wave hits it from above. Two cases -- one unphysical one where the slinky is…
W. G. UnruhOct 19, 2011
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Hamiltonian form and solitary waves of the spatial Dysthe equations
The spatial Dysthe equations describe the envelope evolution of the free-surface and potential of gravity waves in deep waters. Their Hamiltonian structure and new invariants are unveiled by means of…
Francesco Fedele, Denys DutykhOct 18, 2011
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Hamiltonian description and traveling waves of the spatial Dysthe equations
The spatial version of the fourth-order Dysthe equations describe the evolution of weakly nonlinear narrowband wave trains in deep waters. For unidirectional waves, the hidden Hamiltonian structure…
Francesco Fedele, Denys DutykhOct 17, 2011
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Normal Mode Expansion of Damped Coupled Oscillators in 3 dimensions
In this paper, I aim to study free oscillations of a system of oscillators in more than one dimensions in the absence of damping. The basic approach lies in decoupling the motion in the individual…
Milind ShyaniOct 17, 2011
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On the electrodynamics in time-dependent linear media
In this work we study the classical electrodynamics in homogeneous conducting and nonconducting time-dependent linear media in the absence of charge sources. Surprisingly, we find that the time…
I. A. Pedrosa, A. Yu. Petrov, Alexandre RosasOct 13, 2011
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