Results 71 to 80 of about 686,620 (189)

Linear and second-order geometry perturbations on spacetimes with torsion

European Physical Journal C: Particles and Fields, 2019
In order to study gravitational waves in any realistic astrophysical scenario, one must consider geometry perturbations up to second order. Here, we present a general technique for studying linear and quadratic perturbations on a spacetime with torsion ...
Fernando Izaurieta, Eduardo Rodríguez, Omar Valdivia   +2 more
doaj   +1 more source

Negative refraction and mode trapping of flexural-torsional waves in elastic lattices. [PDF]

Philos Trans A Math Phys Eng Sci, 2022
Madine KH, Colquitt DJ.
europepmc   +1 more source

Nonlinear wave equation for torsion

Physics Letters B, 1981
Abstract Specializing the geometry of a Riemann-Cartan space-time U 4 to the case of a completely antisymmetric torsion tensor (axial vector torsion, ∗ K μ ) a set of nonlinear wave equations and constraints are established relating the torsion of the U 4 geometry to an axial vector source current.
openaire   +1 more source

Torsional wave dispersion and dissipation in solar tornados

Astronomy & Astrophysics
Aims. We investigated the nature of solar atmosphere tornados hosting torsional Alfvén waves and fast magnetoacoustic torsional waves in the context of energy transport and transfer. Methods.
Abdolhosseinzadeh A., Fazel Z., Vasheghani Farahani S.   +2 more
doaj   +1 more source

Design and Implementation of an Electronic Front-End Based on Square Wave Excitation for Ultrasonic Torsional Guided Wave Viscosity Sensor

Sensors, 2016
The market for process instruments generally requires low cost devices that are robust, small in size, portable, and usable in-plant. Ultrasonic torsional guided wave sensors have received much attention by researchers for measurement of viscosity and/or
Amir Rabani
doaj   +1 more source

Monitoramento sem fio da vibração torsional de powertrain automotivo [PDF]

, 2015
TCC (graduação) - Universidade Federal de Santa Catarina. Campus Joinville. Engenharia Mecatrônica.A instalação de sensores para a medição da vibração torsional em diversos pontos do powertrain se faz necessária em testes veiculares, o que consome tempo ...
Korol, Daniel Rossi
core  

Coupled tension-torsion vibration of repetitive beam-like structures [PDF]

, 2006
Equivalent continuum stiffness properties, derived from the eigenanalysis of a single cell of a planar beam-like repetitive structure, have previously been employed within well-known dynamic theories, such as Euler–Bernoulli and Timoshenko for flexural ...
Stephen, N.G., Y. Zhang, Zhang, Y., N.G. Stephen   +3 more
core   +1 more source

High-frequency Alfven waves in multi-ion coronal plasma : observational implications [PDF]

, 2005
We investigate the effects of high-frequency (of order ion gyrofrequency) Alfvén and ion-cyclotron waves on ion emission lines by studying the dispersion of these waves in a multi-ion coronal plasma.
Ofman, L. (Leon), Davila, J. M. (Joseph M.), Viñas, A.-F., Nakariakov, V. M. (Valery M.)   +3 more
core   +1 more source

Torsional Alfvén Shock Waves in Stratified Coronal Loops

The Astrophysical Journal
The evolution of weakly nonlinear Alfvén waves in coronal loops in the density structuring both across and along the field while experiencing dissipation is highlighted.
S. M. Hejazi, S. Vasheghani Farahani, K. Hajisharifi   +2 more
doaj   +1 more source

Alfvén wave propagation in the partially ionized lower solar atmosphere: A test of the single-fluid approximation

Astronomy & Astrophysics
Alfvén waves are widely believed to play an important role in the transport of energy from the solar photosphere to the corona through the partially ionized chromosphere.
Soler Roberto
doaj   +1 more source