Nonlinear Pendulum: A Simple GeneralizationIn this work we solve the nonlinear second order differential equation of the simple pendulum with a general initial angular displacement (θ(0)=θ0) and velocity (θ(0)=ϕ0), obtaining a…J. P. Juchem Neto·Jul 22, 2010SaveLearn
Energy in one dimensional linear waves in a stringWe consider the energy density and energy transfer in small amplitude, one-dimensional waves on a string, and find that the common expressions used in textbooks for the introductory physics with…Lior M. Burko·Jul 22, 2010SaveLearn
A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sourcesIn the paper, a vibration damping system powered by harvested energy with implementation of the so-called SSDV (synchronized switch damping on voltage source) technique is designed and investigated.…Hui Shen, Jinhao Qiu, Hongli Ji et al.·Jul 21, 2010SaveLearn
Second gradient poromechanicsSecond gradient theories have been developed in mechanics for treating different phenomena as capillarity in fluids, plasticity and friction in granular materials or shear band deformations. Here,…Giulio Sciarra, Francesco dell'Isola, Olivier Coussy·Jul 21, 2010SaveLearn
Quasi-total absorption peak by use of a backed rigid frame porous layer with circular periodic inclusions embeddedThe acoustic properties of a porous sheet of medium resistivity backed by a rigid plate in which are embedded a periodic set of circular inclusions is investigated. Such a structure behaves like a…Jean-Philippe Groby, Olivier Dazel, Aroune Duclos et al.·Jul 19, 2010SaveLearn
Microwave Radiation from a Particle Revolving Along a Shifted Equatorial Orbit About a Dielectric BallA relativistic electron uniformly rotating along a shifted equatorial orbit about a dielectric ball may generate microwave Cherenkov radiation tens of times more intense as that generated at the…L. Sh. Grigoryan, H. F. Khachatryan, S. R. Arzumanyan et al.·Jul 16, 2010SaveLearn
Is the electrostatic force between a point charge and a neutral metallic object always attractive?We give an example of a geometry in which the electrostatic force between a point charge and a neutral metallic object is repulsive. The example consists of a point charge centered above a thin…Michael Levin, Steven G. Johnson·Jul 13, 2010SaveLearn
Wave motions in unbounded poroelastic solids infused with compressible fluidsLooking at rational solid-fluid mixture theories in the context of their biomechanical perspectives, this work aims at proposing a two-scale constitutive theory of a poroelastic solid infused with an…S. Quiligotti, G. Maugin, F. dell'Isola·Jul 13, 2010SaveLearn
An Eshelbian approach to the nonlinear mechanics of constrained solid-fluid mixturesLooking at rational mixture theories within the context of a new perspective, this work aims to put forward a proposal for an Eshelbian approach to the nonlinear mechanics of a constrained…S. Quiligotti, G. Maugin, F. dell'Isola·Jul 13, 2010SaveLearn
On the exact electric and magnetic fields of an electric dipoleWe derive from Jefimenko's equations a multipole expansion in order to obtain the exact expressions for the electric and magnetic fields of an electric dipole with an arbitrary time dependence. A…W. J. M. Kort-Kamp, C. Farina·Jul 12, 2010SaveLearn
A solid-fluid mixture model allowing for solid dilatation under external pressureA sponge subjected to an increase of the outside fluid pressure expands its volume but nearly mantains its true density and thus gives way to an increase of the interstitial volume. This behaviour,…Giulio Sciarra, Francesco dell'Isola, Kolumban Hutter·Jul 12, 2010SaveLearn
Exploring the action landscape with trial world-linesThe Hamilton action principle, also known as the principle of least action, and Lagrange equations are an integral part of advanced undergraduate mechanics. At present, substantial efforts are…Yogesh N. Joglekar, Weng Kian Tham·Jul 10, 2010SaveLearn
Degradation and healing in a generalized neo-Hookean solid due to infusion of a fluidThe mechanical response and load bearing capacity of high performance polymer composites changes due to diffusion of a fluid, temperature, oxidation or the extent of the deformation. Hence, there is…Satish Karra, K. R. Rajagopal·Jul 7, 2010SaveLearn
Falling spring and falling catenary as cases of force propagationAt every points of a static equilibrium system, the net force is zero. If one of the composite forces of this system is disappeared, it is no more in equilibrium and this effect of absence spreads…Hyunbyuk Kim, Kyoungdae Kim·Jun 29, 2010SaveLearn
Superluminal, subluminal, and negative velocities in free-space electromagnetic propagationIn this Chapter the time-domain analysis of the velocity of the electromagnetic field pulses generated by a spatially compact source in free space is presented. Recent simulations and measurements of…Neil V. Budko·Jun 29, 2010SaveLearn
Measuring the speed of light using beating longitudinal modes in an open-cavity HeNe laserWe describe an undergraduate laboratory that combines an accurate measurement of the speed of light, a fundamental investigation of a basic laser system, and a nontrivial use of statistical analysis.…Daniel J. D'Orazio, Mark Pearson, Justin T. Schultz et al.·Jun 28, 2010SaveLearn
Geodesics of simultaneity in SchwarzschildGeodesic of simultaneity is a spacelike geodesic in which every pair of neighbour events are simultaneous (g0μ xμ=0). These geodesics are studied in the exterior region of 's metric.F. M. Paiva, A. F. F. Teixeira·Jun 23, 2010SaveLearn
Electric-triple-layer model based AC electroosmosis flowThe paper presents an novel electric triple layer(ETL) model as an improved model of electrical double layer(EDL) to predict electroosmosis flow rate on the electrode surface at low frequency. The…Jiang Hongyuan, Li Shanshan, Ren Yukun et al.·Jun 21, 2010SaveLearn
Effects of Asymmetrical Micro Electrode Surface Topography to AC Electroosmosis flow RateAC Electroosmosis (ACEO) has many advantages such as low power consumption, non-moving parts, and easy to integrate etc., so it is widely used for low concentration microfluid manipulation in low…Jiang Hong-Yuan, Li Shan-Shan, Hou Zhen-Xiu et al.·Jun 18, 2010SaveLearn
Energy creation in a moving solenoid?The electromagnetic energy Uem stored in the magnetic field of an ideal solenoid at rest appears for a moving observer as U'em , a sum of magnetic and electric energies satisfying:…Nelson R. F. Braga, Ranieri V. Nery·Jun 18, 2010SaveLearn
Why are very short times so long and very long times so short in elastic waves?In a first study of thermoelastic waves, such as on the textbook of Landau and Lifshitz, one might at first glance understand that when the given period is very short, waves are isentropic because…Guido Parravicini, Serena Rigamonti·Jun 17, 2010SaveLearn
Secure communication in the twin paradoxThe channel capacity between two users is affected by relativistic effects. Under the presence of a fixed noise at the receiver, there appears an asymmetry between "slowly aging" and…Juan Carlos Garcia-Escartin, Pedro Chamorro-Posada·Jun 14, 2010SaveLearn
Role of friction-induced torque in stick-slip motionWe present a minimal quasistatic 1D model describing the kinematics of the transition from static friction to stick-slip motion of a linear elastic block on a rigid plane. We show how the kinematics…Julien Scheibert, Dag Kristian Dysthe·Jun 11, 2010SaveLearn
Heat flow in composite rods - an old problem reconsideredThe interface temperature of two rods with equal cross section joined at one end and with different initial temperatures, initially always acquires the value characteristic for two semi-infinite…T Kranjc, J Peternelj·Jun 10, 2010SaveLearn
Modulational instability of few cycle pulses in optical fibersWe investigate the modulational instability of a mathematical model [based on the model proposed by T. Brabec and F. Krausz, Phys.Rev. Lett. 78, 3282(1997)] appropriate for few cycle optical pulses…Amarendra K. Sarma·Jun 9, 2010SaveLearn