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Classical Physics papers — page 159

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Self force in 2+1 electrodynamics
The radiation reaction problem for an electric charge moving in flat space-time of three dimensions is discussed. The divergences stemming from the pointness of the particle are studied. A consistent…
Yurij YaremkoJul 17, 2009
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Maxwell equations and the redundant gauge degree of freedom
On transformation to the Fourier space ( k, ω), the partial differential Maxwell equations simplify to algebraic equations, and the Helmholtz theorem of vector calculus reduces to vector…
Chun Wa WongJul 17, 2009
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Interference in the radiation of two point-like charges
Energy-momentum and angular momentum carried by electromagnetic field of two point-like charged particles arbitrarily moving in flat spacetime are presented. Apart from usual contributions to the…
Yurij YaremkoJul 16, 2009
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Complex resonance frequencies of a finite, circular radiating duct with an infinite flange
Radiation by solid or fluid bodies can be characterized by resonance modes. They are complex, as well as resonance frequencies, because of the energy loss due to radiation. For ducts, they can be…
Bastien Mallaroni, Pierre-Olivier Mattei, Jean KergomardJul 15, 2009
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Acoustic characterization of Hofstadter butterfly with resonant scatterers
We are interested in the experimental characterization of the Hofstadter butterfly by means of acoustical waves. The transmission of an acoustic pulse through an array of 60 variable and resonant…
Olivier Richoux, Vincent PagneuxJul 15, 2009
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Explicit gauge covariant Euler-Lagrange equation
The application of a gauge covariant derivative to the Euler-Lagrange equation yields a shortcut to the equations of motion for a field subject to an external force. The gauge covariant derivative…
Clinton L. LewisJul 14, 2009
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Design Arbitrary Shaped 2D Acoustic Cloak without Singularity
A method is proposed to design arbitrary shaped two dimensional (2D) isotropic-inertia acoustic cloaks without singularity. The method is based on the deformation view of the transformation method,…
Jin Hu, Xiaoming Zhou, Gengkai HuJul 14, 2009
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Choosing Dielectric or Magnetic Material to Optimize the Bandwidth of Miniaturized Resonant Antennas
We address the question of the optimal choice of loading material for antenna miniaturization. A new approach to identify the optimal loading material, dielectric or magnetic, is presented for…
Antti O. Karilainen, Pekka Ikonen, Constantin R. Simovski et al.Jul 13, 2009
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Angular Normal Modes of a Circular Coulomb Cluster
We investigate the angular normal modes for small oscillations about an equilibrium of a single-component coulomb cluster confined by a radially symmetric external potential to a circle. The…
L. W. Lupinski, M. J. MadsenJul 10, 2009
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The Nature of Time: from a Timeless Hamiltonian Framework to Clock Time of Metrology
The problem of the Nature of Time is twofold: whether or not time is a fundamental quantity of Nature, and how does clock time of metrology emerge in the experimental description of dynamics. This…
Enrico PratiJul 10, 2009
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Characterization by a time-frequency method of classical waves propagation in one-dimensional lattice : effects of the dispersion and localized nonlinearities
This paper presents an application of time-frequency methods to characterize the dispersion of acoustic waves travelling in a one-dimensional periodic or disordered lattice made up of Helmholtz…
Olivier Richoux, Claude Depollier, Jean HardyJul 9, 2009
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Laser Doppler Velocimetry for Joint Measurements of Acoustic and Mean Flow Velocities : LMS-based Algorithm and CRB Calculation
This paper presents a least mean square (LMS) algorithm for the joint estimation of acoustic and mean flow velocities from laser doppler velocimetry (LDV) measurements. The usual algorithms used for…
Laurent Simon, Olivier Richoux, Anne Degroot et al.Jul 7, 2009
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Model of multilayered materials for interface stresses estimation and validation by finite element calculations
The mechanical problem discussed in this paper focuses on the stress state estimation in a composite laminate in the vicinity of a free edge or microcracks. To calculate these stresses, we use two…
Rui Pedro Carreira, Jean-François Caron, Alberto Diaz DiazJul 6, 2009
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A constructive approach to the special theory of relativity
Simple physical models of a measuring rod and of a clock are used to demonstrate the contraction of objects and clock retardation in special relativity. It is argued that the models could help in…
D. J. MillerJul 6, 2009
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Group and phase velocities in the free-surface visco-potential flow: new kind of boundary layer induced instability
Water wave propagation can be attenuated by various physical mechanisms. One of the main sources of wave energy dissipation lies in boundary layers. The present work is entirely devoted to thorough…
Denys DutykhJul 5, 2009
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Modelling the pressure field in the vicinity of a microphone membrane using PIV
A new approach for for estimating the acoustic pressure in the near field of a microphone based on non-intrusive direct measurement of acoustic particle velocity is proposed. This method enables the…
Olivier Richoux, Anne Degroot, Bruno Gazengel et al.Jul 3, 2009
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Effect of the open roof on low frequency acoustic propagation in street canyons
This paper presents an experimental, numerical and analytical study of the effect of open roof on acoustic propagation along a 3D urban canyon. The experimental study is led by means of a street…
Olivier Richoux, Ayrault Christophe, Adrien Pelat et al.Jul 3, 2009
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Super-reflection and Cloaking Based on Zero Index Metamaterial
A zero index metamaterial (ZIM) can be utilized to block wave (super-reflection) or conceal objects completely (cloaking). The "super-reflection" device is realized by a ZIM with a perfect…
Jiaming Hao, Wei Yan, Min QiuJun 30, 2009
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Tangential force and heating rate of a neutral relativistic particle mediated by equilibrium background radiation
A relativistic theory of fluctuation -electromagnetic interaction of a small polarizable particle moving with respect to the equilibrium background radiation is reviewed. It is assumed that the…
G. V. Dedkov, A. A. KyasovJun 27, 2009
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Electromagnetic source transformations and scalarization in stratified gyrotropic media
It is known that with restrictions on the type of the constitutive equations, Maxwell's equations in non-uniform media can sometimes be reduced to two 2nd order differential equations for 2…
Patrick De VisschereJun 26, 2009
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On the peculiarity of the Coulomb gauge
In an earlier paper we provided an alternative to the standard gauge concept for deriving the classical electromagnetic wave equations. This alternative involves recognition of two previously…
Paul J Cote, Mark A JohnsonJun 25, 2009
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Viscoelastic properties of wood across the grain measured under water-saturated conditions up to 135 C: evidence of thermal degradation
In this paper, the viscoelastic properties of wood under water-saturated conditions are investigated from 10 C to 135 C using the WAVET* apparatus. Experiments were performed via…
Vincent Placet, Joëlle Passard, Patrick PerréJun 19, 2009
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Viscoelastic properties of green wood across the grain measured by harmonic tests in the range of 0 C to 95 C. Hardwood vs. softwood and normal wood vs. reaction wood
The viscoelastic properties of wood have been investigated with a dynamic mechanical analyser (DMA) specifically conceived for wooden materials, the WAVET device (environmental vibration analyser for…
Vincent Placet, Joëlle Passard, Patrick PerréJun 19, 2009
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WAVET*, a custom device able to measure viscoelastic properties of wood under water saturated conditions (*WAVET : Environmental Vibration Analyser for Wood)
This work presents an original experimental device conceived to characterise the viscoelastic properties of wood. Classically, the dynamic mechanical analysis of wood is performed using a commercial…
Vincent Placet, Joëlle Passard, Patrick PerréJun 19, 2009
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Characterization of the thermo-mechanical behaviour of Hemp fibres intended for the manufacturing oh high performance composites
In this paper, the thermo-mechanical behaviour of hemp fibres (Cannabis sativa L.) is investigated using a Dynamic Mechanical Analyser. Experiments are performed at a frequency of 1 Hz in the…
Vincent PlacetJun 19, 2009
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