Singular value distribution of the propagation matrix in random scattering mediaThe distribution of singular values of the propagation operator in a random medium is investigated, in a backscattering configuration. Experiments are carried out with pulsed ultrasonic waves around…Alexandre Aubry, Arnaud Derode·Apr 1, 2009SaveLearn
Sound propagation in a solid through a screen of cylindrical scatterersThe propagation of SH waves in a solid containing a screen of line-like scatterers is investigated. When the scatterers are uniformly distributed, the amplitudes of the coherent waves inside and…Yves C. Angel, Christophe Aristégui, Mihai Caleap·Mar 30, 2009SaveLearn
Accelerating spaceships paradox and physical meaning of length contractionA fifty-year old apparently paradoxical thought experiment involving two accelerating spaceships and a thread hat connects them states that the thread will break due to length contraction. This…Vesselin Petkov·Mar 30, 2009SaveLearn
Focusing Ultrasound with Acoustic Metamaterial NetworkWe present the first experimental demonstration of focusing ultrasound waves through a flat acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz resonators. We observed…Shu Zhang, Leilei Yin, Nicholas Fang·Mar 29, 2009SaveLearn
Geometric evolution of the Reynolds stress tensorThe dynamics of the Reynolds stress tensor for turbulent flows is described with an evolution equation coupling both geometric effects and turbulent source terms. The effects of the mean flow…Sergey L. Gavrilyuk, Henri Gouin·Mar 28, 2009SaveLearn
Subtleties on energy calculations in the image methodIn this pedagogical work we point out a subtle mistake that can be done by undergraduate or graduate students in the computation of the electrostatic energy of a system containing charges and perfect…M. M. Taddei, T. N. C. Mendes, C. Farina·Mar 26, 2009SaveLearn
New perspectives on classical electromagnetismThe fallacies associated with the gauge concept in electromagnetism are illustrated. A clearer and more valid formulation of the basics of classical electromagnetism is provided by recognizing…Paul J. Cote·Mar 24, 2009SaveLearn
Asymptotic bifurcation solutions for compressions of a clamped nonlinearly elastic rectangle: transition region and barrelling to a corner-like profileBuckling and barrelling instabilities in the uniaxial compressions of an elastic rectangle have been studied by many authors under lubricated end conditions. However, in practice it is very difficult…H. H. Dai, F. F. Wang·Mar 23, 2009SaveLearn
Hawking-Unruh radiation as irreversible consequence of radiative action in dynamicsHawking-Unruh thermal state of warm surrounding field encountered in non-inertial frames is shown to be a real phenomenon, a marker of nonstationary dynamic evolutions. In accelerated motion of a…D. Das·Mar 20, 2009SaveLearn
Nonlinear modes of clarinet-like musical instrumentsThe concept of nonlinear modes is applied in order to analyze the behavior of a model of woodwind reed instruments. Using a modal expansion of the impedance of the instrument, and by projecting the…Daniel Noreland, Sergio Bellizzi, Christophe Vergez et al.·Mar 19, 2009SaveLearn
Dumbbell transport and deflection in a spatially periodic potentialWe present theoretical results on the deterministic and stochastic motion of a dumbbell carried by a uniform flow through a three-dimensional spatially periodic potential. Depending on parameters…Jochen Bammert, Walter Zimmermann·Mar 13, 2009SaveLearn
Spectrum of a fluid-loaded vibrating plate: the multiple resonance phenomenonIt was recently observed in a numerical study on a high order perturbation method under heavy fluid loading that a loaded vibrating plate results, not only in the classical frequency shift of the in…Pierre-Olivier Mattei·Mar 10, 2009SaveLearn
On the average of electrostatic and magnetostatic fields, the singularities of dipole fields and depolarizing fieldsIn "Classical Electrodynamics" (Jackson) a theorem is proved on the average of an electrostatic or magnetostatic field over a spherical volume. The proof of the theorem is based on an…Patrick De Visschere·Mar 5, 2009SaveLearn
Plancher solaire direct mixte à double réseau en habitat bioclimatique - Conception et bilan thermique réel. Double direct solar floor heating in boclimatic habitation - Design and real energetical balanceThis study presents a new direct solar floor heating technique with double heating network wich allows simultaneous use of solar and supply energy. Its main purpose is to store and to diffuse the…Thierry De Larochelambert·Mar 4, 2009SaveLearn
Etude expérimentale et numérique des transferts de chaleur en convection naturelle le long de parois verticales épaisses rayonnantes fortement chaufféesThermal balances and complete investigation of air flow along a uniformly heated vertical black thick steel plate (1000 to 8000 W/m\2) have been obtained by means of a thermoanemometric method and…Thierry De Larochelambert·Mar 4, 2009SaveLearn
The positivity and other properties of the matrix of capacitance: physical and mathematical implicationsWe prove that the matrix of capacitance in electrostatics is a positive-singular matrix with a non-degenerate null eigenvalue. We explore the physical implications of this fact, and study the…Rodolfo A. Diaz, William J. Herrera·Mar 3, 2009SaveLearn
Substitutional Al solute interaction with edge and screw dislocation in Ni: a comparison between atomistic computation and continuum elastic theoryMolecular static simulations have been performed to study the interaction between a single dislocation and a substitutional Al solute atom in a pure crystal of Ni. When the Al solute is situated at…Sylvain Patinet·Mar 3, 2009SaveLearn
Attenuation and damping of electromagnetic fields: Influence of inertia and displacement currentNew results for attenuation and damping of electromagnetic fields in rigid conducting media are derived under the conjugate influence of inertia due to charge carriers and displacement current.…F. E. M. Silveira, J. A. S. Lima·Mar 2, 2009SaveLearn
Evanescent gravitational massA simple and innocent modification of Poisson's equation leads to a modified Newtonnian theory of gravitation where a localized and positive energy density of the gravitational field…Lluis Bel·Feb 25, 2009SaveLearn
New approach to radiation reaction in classical electrodynamicsThe problem of self forces and radiation reaction is solved by conservation of energy methods. The longstanding problem of constant acceleration is solved, and it is shown that the self force does…Richard T Hammond·Feb 24, 2009SaveLearn
Explicit formulas for currents at branching long lines and for maximum of current amplitudesA system of 'telegrapher's' equations for a number of long lines joined into a network is studied. Explicit formulas for Fourier transforms of current and voltage are derived. These…Nikolai Dokuchaev·Feb 20, 2009SaveLearn
Floating Bodies of Equilibrium at Density 1/2 in Arbitrary DimensionsBodies of density one half (of the fluid in which they are immersed) that can float in all orientations are investigated. It is shown that expansions starting from and deforming the (hyper)sphere are…Franz Wegner·Feb 20, 2009SaveLearn
Weakly nonlocal non-equilibrium thermodynamics - variational principles and Second LawA general, uniform, rigorous and constructive thermodynamic approach to weakly nonlocal non-equilibrium thermodynamics is reviewed. A method is given to construct and restrict the evolution equations…P. Ván·Feb 18, 2009SaveLearn
Constraining Validity of the Minkowski Energy-Momentum TensorThere exist two popular energy-momentum tensors for an electromagnetic wave in a dielectric medium. The Abraham expression is robust to experimental verification but more mathematically demanding,…R. N. C. Pfeifer, T. A. Nieminen, N. R. Heckenberg et al.·Feb 16, 2009SaveLearn
The Ideal Gas Behavior is in Fact Nothing, But a Macroscopic Quantum Mechanical ManifestationThis article mainly consists in the quantum mechanical study of an adiabatically compressed particle, in an infinitely high well, which we conjecture, can be considered as the basis of an ideal gas.…Tolga Yarman, Alexander L. Kholmetskii, Jean-Louis Tane·Feb 16, 2009SaveLearn