On disturbances in a semi-infinite visco-elastic rod in a magnetic field

Summary The paper makes use of electromagnetic equations of Maxwell, the equations of mechanical motion together with stress and strain relation of a particular visco-elastic material, to determine the disturbances in it when excited by a magnetic field.     

On longitudinal disturbances in a viscoelastic solid of Reiss type placed in a magnetic field

Summary The propagation of longitudinal disturbances in a viscoelastic solid of Reiss type subjected to a magnetic field has been obtained in the present note.     

On disturbances in a viscoelastic solid rod of Burger's type subjected to a magnetic field

Summary The propagation of disturbances in a semi-infinite visco-elastic rod of Burger's type has been investigated, when the rod is subjected to an initially static magnetic field, making use of the electro-magnetic equations of Maxwell, equations of elasticity and the stress-strain relations of the material.     

On disturbances in a visco-elastic medium of Maxwell type in contact with a liquid medium and subjected to a magnetic field

Summary The problem of disturbances in a visco-elastic medium due to Maxwell in contact with a liquid medium — both being perfectly conductive — has been investigated when an impulsive force acts along the plane of the contact. The electro-magnetic equations of Maxwell, equation of elasticity and the stress-strain relations of the material have been used in the investigation.     

On the propagation of plane waves in a porous visco-elastic material containing a fluid and deformed by a magnetic field

Summary In the present note, an attempt has been made to investigate the wave-motions in a poro-viscoelastic medium traversed by a static magnetic field, by using the equations ofMaxwell, and those ofBiot.     

Rayleigh-waves on cylindrical surfaces of visco-elastic material of general linear type in presence of a magnetic field

Summary The propagation of disturbances in cylindrical surfaces of visco-elastic material of general linear type (i) cylinder surrounded by a vacuum (ii) and on an infinite body of same material having a cylindrical cavity, when the surface is subjected to an initially static magnetic field, making use of the electro-magnetic equations of Maxwell, equations of elasticity and the stress-strain relations of the material.     

On disturbances in a viscoelastic (three-parameter type) medium acted upon by a magnetic field

Summary In this note, the problem of disturbances has been investigated in two perfectly (electrically) conductive media-an ideal liquid and a viscoelastic solid of three-parameter type-acted upon by a magnetic field. The electromagnetic equations of Maxwell and the equations of mechanical motion together with the stress-strain relation of the viscoelastic material of three-parameter type have been used to work out the problem. The results exhibit the predominance of transient behaviour in the displacements as well as in the stresses.     

On disturbances in a piezoelectric layer permeated by a magnetic field

Summary The methods of transform calculus are made use of in finding the disturbances in a piezoelectric layer with an impulsive force at its free faces in presence of a magnetic field. The problem is solved for time dependent elastic compliance of the material of the layer.     

On magneto-elastic disturbaces in a visco-elastic cylinder placed in a magnetic field

Summary The present note is an attempt to discuss the disturbances in a cylinder characterised by a visco-elasticity of general linear type, which is subjected to a magnetic field.     

Propagation of Rayleigh waves on visco-elastic cylindrical surfaces placed in a magnetic field

Summary This paper studies axial Rayleigh waves in visco-elastic cylinder surrounded by vacuum and for body of same material with a cylindrical cavity. Magneto-elastic equations of motion for wave propagation in the radial and axial direction have been solved to obtain frequency equations.     

On disturbances in an inhomogeneous viscoelastic bar of Reiss type in a magnetic field

Summary This paper deals with the study of the disturbances in an inhomogeneous semi-infinite viscoelastic bar of Reiss type acted upon by an impulsive force at its finite end, under the influence of a primary static magnetic field.     

On disturbances in a semi-infinite medium traversed by a transverse magnetic field

Summary The method of operational calculus has been used to deal with the disturbances in an elastic medium traversed by a magnetic field.     

On the vibration of a visco-elastic cylindrical shell and a composite visco-elastic cylinder with an isotropic core in an axial magnetic field

Summary The electrc-magnetic equations of Maxwell and the equations of mechanical motion have been used to investigate the vibrations of a cylindrical shell and also a cylinder with an isotropic core characterised by a visco-elasticity of Voigt tupe.     

On disturbances in a viscoelastic rod (of variable cross-section) of Reiss type placed in a magnetic field

Summary The equations of mechanical motion and electromagnetic equations of Maxwell have been used to investigate the disturbances in a viscoelastic rod of Reiss type placed in a magnetic field.     

日面方位磁场扰动和行星际磁场螺旋结构

文采用球坐标下2.5维理想MHD模型,对日球子午面内方位磁场扰动的传播进行数值模拟,重点分析它对行星际磁场螺旋角的影响. 本文认为,观测到的行星际磁场螺旋角大于Parker模型的预言值,是太阳表面不断向行星际发出同向方位磁场扰动的结果;太阳较差自转在太阳内部产生的方位磁场为这类扰动提供了源头. 模拟结果表明,采用持续时间等于周期的十分之一、扰动幅度为103nT量级的正向方位磁场扰动,就可使1 AU处行星际磁场的螺旋角增加2°左右,与有关观测结果相符. 模拟结果还表明,上述方位磁场扰动对日球子午面内的太阳风特性和磁场位形的影响基本上可以忽略.     

Magnetoelastic disturbances in a perfectly conducting cylindrical shell in a constant magnetic field

Summary The paper deals with the problem of determining the displacements, stresses, magnetic and the electric fields of an infinite shell placed in vacuum and subjected to an impulsive excitation load.     

On the propagation of disturbances in a composite viscoelastic layer in a magnetic field

Summary The propagation of disturbances in a composite viscoelastic layer when subjected to an impulsive force in the presence of a primary magnetic field, has been investigated in this note. The mechanical displacement has been derived from the electro-magnetic equations of Maxwell, the equation of motion and the stress-strain relations of the materials considered and has been computed for small values of time.     

On magnetoelastic disturbances in an aelotropic elastic cylinder placed in a magnetic field

Summary The present note deals with the disturbances in an aelotropic elastic cylinder placed in an axial magnetic field, being acted upon by a mechanical force.     

On the deformations in a viscoelastic substance (Fener type) permeated by a magnetic field

Summary Proceeding from the equations of electromagnetism (Maxwell) and those of mechanical motions, this investigation has been carried in a layered media, comprising of a liquid and a solid (Fener type) layers to determine the mechanical deformation. It is found that the disturbances owing to the coupling effect of the transversely acting magnetic field and the tangential force along the inference, are predominantly transient in character for both ranges of time, but being damped more in case of larger values.     

A note on magnetic modelling with remanence

The general problem of magnetic modelling involves accounting for the effect of both remanent magnetization and the application of an external magnetic field. However, as far as the disturbing field of a magnetic body in a magnetic environment is concerned, there is an equivalence between the effects of these two causations that allows the remanence to be represented in terms of an equivalent primary magnetic H field. Moreover, due to the linearity of the magnetic field in terms of its causations, the general modelling problem involving an applied magnetic field in the presence of remanence can be simply and more efficiently dealt with in terms of an equivalent primary field acting in the absence of any remanent magnetization.