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Classical Physics papers — page 172

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Problems and Solutions in a Graduate Course in Classical Electrodynamics (1)
The following is the very first set of the series in 'Problems and Solutions in a Graduate Course in Classical Electrodynamics'. In each of the sets of the problems we intend to follow a…
Raza M. SyedJan 29, 2008
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An Equation for Charge Decay Valid in Both Conductors and Insulators
Gauss' law and the equation of continuity must be satisfied in all materials be they solids, liquids or gases. Most materials are classified as simple materials; i.e., their electrical properties…
Albert E. SeaverJan 28, 2008
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Geometrically controllable electric fields
According to a first-principles approach, we clarify electric cloaks universality concerning a new class of phase transitions between negative pathway (NGP) and normal pathway of electric…
C. Z. Fan, Y. Gao, J. P. HuangJan 26, 2008
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Stability analysis of rotating beams rubbing on an elastic circular structure
This paper presents the stability analysis of a system composed of rotating beams on a flexible, circular fixed ring, using the Routh-Hurwitz criterion. The model displayed has been fully developed…
Nicolas Lesaffre, Jean-Jacques Sinou, Fabrice ThouverezJan 24, 2008
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Contact identification for assembly-disassembly simulation with a haptic device
Assembly/Disassembly (A/D) simulations using haptic devices are facing difficulties while simulating insertion/extraction operations such as removing cylinders from holes. In order to address this…
Robert Iacob, Peter Mitrouchev, Jean-Claude LéonJan 24, 2008
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Stability analysis and μ-synthesis control of brake systems
The concept of friction-induced brake vibrations, commonly known as judder, is investigated. Judder vibration is based on the class of geometrically induced or kinematic constraint instability. After…
Sylvain Lignon, Jean-Jacques Sinou, Louis JezequelJan 23, 2008
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The wetting problem of fluids on solid surfaces: Dynamics of lines and contact angle hysteresis
In 1805, Young was the first who introduced an expression for contact angle in static, but today, the motion of the contact-line formed at the intersection of two immiscible fluids and a solid is…
Henri GouinJan 21, 2008
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The invariant manifold approach applied to nonlinear dynamics of a rotor-bearing system
The invariant manifold approach is used to explore the dynamics of a nonlinear rotor, by determining the nonlinear normal modes, constructing a reduced order model and evaluating its performance in…
Cristiano Villa, Jean-Jacques Sinou, Fabrice ThouverezJan 19, 2008
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Modélisation de la propagation dans une structure fermée surdimensionnée
The propagation of an electromagnetic wave in closed structures led to numerous applications ranging from the characterization of materials in resonating cavities to the measurements using pregnant…
François Demontoux, Fabrice Bonnaudin, Jean-Louis MianeJan 18, 2008
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Hamiltonian structure of the complex Monge-Ampère equation
We discover Hamiltonian structure of the complex Monge-Amp`ere equation when written in a first order two-component form. We present Lagrangian and Hamiltonian functions, a symplectic form and the…
Y. Nutku, M. B. SheftelJan 17, 2008
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On the number of droplets in aerosols
The number of droplets which may be formed with a supersaturated vapor in presence of a gas cannot exceed a number proportional to (pv-pvo)4 where pv and pvo denote at the same temperature the…
Henri Gouin, Françoise CubisolJan 16, 2008
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Monitoring field soil suction using a miniature tensiometer
An experimental device was developed to monitor the field soil suction using miniature tensiometer. This device consists of a double tube system that ensures a good contact between the tensiometer…
Yu-Jun Cui, Anh-Minh Tang, Altin Theodore Mantho et al.Jan 15, 2008
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The wetting problem of fluids on solid surfaces. Part 2: the contact angle hysteresis
In part 1, we proposed a model of dynamics of wetting for slow movements near a contact line formed at the interface of two immiscible fluids and a solid when viscous dissipation remains bounded. The…
Henri GouinJan 12, 2008
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The wetting problem of fluids on solid surfaces. Part 1: the dynamics of contact lines
The understanding of the spreading of liquids on solid surfaces is an important challenge for contemporary physics. Today, the motion of the contact line formed at the intersection of two immiscible…
Henri GouinJan 11, 2008
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The Square Cat
We present a simple, two dimensional example of a "cat" -- a body with zero angular momentum that can rotate itself with no external forces. This model is used to explain why this problem is…
E. Putterman, O. RazJan 7, 2008
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Linear and Non Linear Effects on the Newtonian Gravitational Constant as deduced from the Torsion Balance
The Newtonian gravitational constant has still 150 parts per million of uncertainty. This paper examines the linear and nonlinear equations governing the rotational dynamics of the torsion…
Michele Rossi, Lorenzo ZaninettiJan 4, 2008
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Functions of diffraction correction and analytical solutions in nonlinear acoustic measurement
This paper presents an analytical formulation for correcting the diffraction associated to the second harmonic of an acoustic wave, more compact than that usually used. This new formulation,…
Laurent Alliès, D. Kourtiche, M. NadiJan 3, 2008
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Longitudinal and transverse components of a vector field
A unified account, from a pedagogical perspective, is given of the longitudinal and transverse projective delta functions proposed by Belinfante and of their relation to the Helmholtz theorem for the…
A. M. StewartJan 2, 2008
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The Dynamics of Relativistic Length Contraction and the Ehrenfest Paradox
Relativistic kinematics is usually considered only as a manifestation of pseudo-Euclidean (Lorentzian) geometry of space-time. However, as it is explicitly stated in General Relativity, the geometry…
Moses FayngoldDec 23, 2007
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Digital Image Mechanical Identification (DIMI)
A continuous pathway from digital images acquired during a mechanical test to quantitative identification of a constitutive law is presented herein based on displacement field analysis. From images,…
François Hild, Stéphane RouxDec 23, 2007
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On the Relationship between Thermodynamics and Special Relativity
Starting from a formulation for the dS element that includes movement, and considering the variation of the entropy Lorentz invariant, we found the relativistic transformations for thermodynamic…
C. A. Farías, P. S. Moya, V. A. PintoDec 21, 2007
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On the measurement by EDX of diffusion profiles of Ni/Cu assemblies
To characterise (inter)diffusion in materials, concentration profiles can be measured by EDX. It allows one to determine the chemical composition with a very good accuracy if measurement artefacts…
Olivier Arnould, François HildDec 21, 2007
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Rectification in synthetic conical nanopores: a one-dimensional Poisson-Nernst-Planck modeling
Ion transport in biological and synthetic nanochannels is characterized by phenomena such as ion current fluctuations and rectification. Recently, it has been demonstrated that nanofabricated…
I. D. Kosińska, I. Goychuk, M. Kostur et al.Dec 20, 2007
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Decay of scalar variance in isotropic turbulence in a bounded domain
The decay of scalar variance in isotropic turbulence in a bounded domain is investigated. Extending the study of Touil, Bertoglio and Shao (2002; Journal of Turbulence, 03, 49) to the case of a…
Guillevic Lamaison, Wouter Bos, L. Shao et al.Dec 18, 2007
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Inertial range scaling of scalar flux spectra in uniformly sheared turbulence
A model based on two-point closure theory of turbulence is proposed and applied to study the Reynolds number dependency of the scalar flux spectra in homogeneous shear flow with a cross-stream…
Wouter J. T. Bos, Jean-Pierre BertoglioDec 18, 2007
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