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Classical Physics papers — page 156

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Acoustic transmission enhancement through a periodically-structured stiff plate without any opening
We report both experimentally and theoretically that the enhanced acoustic transmission can occur in the subwavelength region through a thin but stiff structured-plate without any opening. This…
Zhaojian He, Han Jia, Chunyin Qiu et al.Dec 21, 2009
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Fractal design for efficient brittle plates under gentle pressure loading
We consider a plate made from an isotropic but brittle elastic material, which is used to span a rigid aperture, across which a small pressure difference is applied. The problem we address is to find…
R. S. FarrDec 17, 2009
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Performance and Stability of a Winged Vehicle in Ground Effect
Present work deals with the dynamics of vehicles which intentionally operate in the ground proximity. The dynamics in ground effect is influenced by the vehicle orientation with respect to the…
Nicola de DivitiisDec 17, 2009
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Distorted Born Diffraction Tomography: limits and applications to inverse the ultrasonic field scattered by an non-circular infinite elastic tube
This study focuses on the application of ultra sonic diffrac tion tomography to noncircular 2D-cylindri - cal ob jects im mersed in an in fi nite fluid. The dis torted Born it er a tive method used…
Philippe Lasaygues, Régine Guillermin, Jean-Pierre LefebvreDec 16, 2009
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Tilted Micro Air Jet for Flow Control
In this paper, we present an interesting method to microfabricate a tilted micro air jet generator. We used the well-know deep reactive ion etching (DRIE) technique in order to realize in a silicon…
Julien Malapert, Réda Yahiaoui, Rabah Zeggari et al.Dec 14, 2009
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Performance and Stability Analysis of a Shrouded-Fan UAV
This paper deals with the estimation of the performance and stability for a shrouded-fan unmanned rotorcraft whose mission profile also prescribes the flight in ground effect. The not so simple…
Nicola de DivitiisDec 14, 2009
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Galilean Covariance versus Gauge Invariance
We demonstrate for the first time and unexpectedly that the Principle of Relativity dictates the choice of the "gauge conditions" in the canonical example of a Gauge Theory namely Classical…
Germain RousseauxDec 11, 2009
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On the proper choice of a Lorentz-covariant relativistic Lagrangian
A proper choice for the sign of the Lorentz-covariant relativistic Lagrangian for a particle moving in an electromagnetic field is presented. This choice is based on which space-time metric is used…
Alain J. BrizardDec 3, 2009
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2D multi-objective placement algorithm for free-form components
This article presents a generic method to solve 2D multi-objective placement problem for free-form components. The proposed method is a relaxed placement technique combined with an hybrid algorithm…
Guillaume Jacquenot, Fouad Bennis, Jean-Jacques Maisonneuve et al.Nov 30, 2009
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Determination of the symmetries of an experimentally determined stiffness tensor; application to acoustic measurements
For most materials, the symmetry group is known a priori and deduced from the realization process. This allows many simplifications for the measurements of the stiffness tensor. We deal here with the…
Marc Louis Maurice François, Giuseppe Geymonat, Yves BerthaudNov 27, 2009
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Behavior of cracked materials
Due to their microstructure, quasi brittle materials present rough cracks. Under sliding of the crack lips, this roughness involves in one hand induced opening and in the other hand some apparent…
Marc Louis Maurice FrançoisNov 27, 2009
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An electric charge has no screw sense--a comment on the twistfree formulation of electrodynamics by da Rocha & Rodrigues
Da Rocha and Rodigues (RR) claim (i) that in classical electrodynamics in vector calculus the distinction between polar and axial vectors and in exterior calculus between twisted and untwisted forms…
Yakov Itin, Yuri N. Obukhov, Friedrich W. HehlNov 26, 2009
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Comment on: "A one-way speed of light experiment" by E. D. Greaves, et al. Am. J. Phys. 77(10), 894-896 (2009)
This is a comment on E. D. Greaves et al. paper. We argue that their laboratory experiment cannot be interpreted as measuring the one-way speed of light.
A. Macdonald, E. MinguzziNov 25, 2009
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Estimation and global control of noise reflections
In theory, active control could be used to reduce the unwanted noise reflections from surfaces such as a submarine hull or the walls of an anechoic room. In the recent years, a real-time algorithm…
Emmanuel Friot, Alexandre GintzNov 24, 2009
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Electrically small magnetic dipole antennas with quality factors approaching the Chu lower bound
This paper has been withdrawn by the authors, due to the IEEE copyright policy requirements.
Oleksiy S. Kim, Olav Breinbjerg, Arthur D. YaghjianNov 19, 2009
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Some features of electromagnetic field of charged particle revolving about dielectric ball
A relativistic electron uniformly rotating along an equatorial orbit around a dielectric ball may generate Cherenkov radiation tens of times more intense as that in case of revolution of a particle…
S. R. Arzumanyan, L. Sh. Grigoryan, H. F. Khachatryan et al.Nov 18, 2009
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Friction force: from mechanics to thermodynamics
We study some mechanical problems in which a friction force is acting on the system. Using the fundamental concepts of state, time evolution and energy conservation we explain how to extend Newtonian…
Christian Ferrari, Christian GruberNov 17, 2009
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Modelling the electric field applied to a tokamak
The vector potential for the Ohmic heating coil system of a tokamak is obtained in semi-analytical form. Comparison is made to the potential of a simple, finite solenoid. In the quasi-static limit,…
Robert W. JohnsonNov 1, 2009
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Model solution for volume reflection of relativistic particles in a bent crystal
For volume reflection process in a bent crystal, exact analytic expressions for positively- and negatively-charged particle trajectories are obtained within a model of parabolic continuous potential…
M. V. BondarencoOct 31, 2009
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The maximal acceleration, Extended Relativistic Dynamics and Doppler type shift for an accelerated source
Based on the generalized principle of relativity and the ensuing symmetry, we have shown that there are only two possible types of transformations between uniformly accelerated systems. The first…
Yaakov FriedmanOct 29, 2009
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Coulomb interaction revised in the presence of material with negative permittivity
Coulomb law is one of the fundamental laws in Physics. It describes the magnitude of the electrostatic force between two electric charges. Counterintuitively the repulsion force between two equal…
A. A. Rangelov, N. KarchevOct 28, 2009
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Two bodies gravitational system with variable mass and damping-antidamping effect due to star wind
We study two-bodies gravitational problem where the mass of one of the bodies varies and suffers a damping-antidamping effect due to star wind during its motion. A constant of motion, a Lagrangian…
G. V. Lopez, E. M. JuarezOct 24, 2009
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One dimensional relativistic free particle in a quadratic dissipative medium
The deduction of a constant of motion, a Lagrangian, and a Hamiltonian for relativistic particle moving in a dissipative medium characterized by a force which depends on the square of the velocity of…
G. V. Lopez, G. C. Montes, J. G. T. ZenudoOct 24, 2009
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On the effective permittivity of finite inhomogeneous objects
A generalization of the S-parameter retrieval method for finite three-dimensional inhomogeneous objects under arbitrary illumination and observation conditions is presented. The effective…
Shreyas B. Raghunathan, Neil V. BudkoOct 22, 2009
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A compressible two-fluid model for the finite volume simulation of violent aerated flows. Analytical properties and numerical results
In the study of ocean wave impact on structures, one often uses Froude scaling since the dominant force is gravity. However the presence of trapped or entrained air in the water can significantly…
Frédéric Dias, Denys Dutykh, Jean-Michel GhidagliaOct 22, 2009
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