Home
>
Journals & magazines
> IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education)
IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education)
Online ISSN
2053-7905
Print ISSN 0143-702X
Print ISSN 0143-702X
Published from 1989-1990, IEE Proceedings A contained significant and original contributions on physical science, measurement and instrumentation, management and education, together with topics of general interest to electrical engineers.
This journal was previously known as IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education, Reviews) 1980-1988. ISSN 0143-702X. more..
This publication is continued by IEE Proceedings A (Science, Measurement and Technology) 1991-1993. ISSN 0960-7641. more..
Latest content
-
Finite-element modelling of high-frequency electromagnetic problems with material discontinuities
- Author(s): R.L. Ferrari and R.L. Naidu
- + Show details - Hide details
-
p.
313
–320
(8)
A weighted residual formulation, suitable for finite-element application, is given for the general high-frequency time-harmonic electromagnetic problem presented by a lossy anisotropic inhomogeneous boundary driven linear system. Either of the dual field vectors H or E may be chosen as the working variable. New light is thrown on the difficulties arising in finite-element analysis when components of the working variable are discontinuous owing to sharp jumps in material properties. The latter are shown to represent ‘natural’ boundaries not specifically requiring any constraint. The modification of the formulation applying to the eigenproblem of an axially uniform waveguide is presented. The equivalence of the Galerkin option of the formulation used in the paper and the corresponding variational approach is discussed. Some finite-element numerical results relating to the analytically soluble problem of a waveguide with an axial discontinuity in material property are presented, confirming the predictions made and demonstrating the practical possibility of solving high-frequency problems by the finite-element method successively with dual working variables.
-
Geometrical formulation for variational electromagnetics
- Author(s): D. Baldomir and P. Hammond
- + Show details - Hide details
-
p.
321
–330
(10)
The choice of co-ordinates in the calculation of electromagnetic fields is difficult because the direction of the field varies from point to point. It is, therefore, desirable to use methods which are co-ordinate-free and are based on geometry rather than algebraic equations. Variational methods are particularly appropriate for systems dealing with geometrical objects having varying curvature. Such methods exist for mechanical systems and some of the results can be transferred to electromagnetics. It is shown that the geometrical approach to electromagnetics unifies the subject and that it gives guidance in the choice of simple numerical methods of calculation.
-
Asynchronous dielectric induction motor
- Author(s): E.R. Mognaschi and J.H. Calderwood
- + Show details - Hide details
-
p.
331
–338
(8)
A small electrostatic induction motor has been constructed, consisting of a cylindrical stator with 24 bars, forming 8 pitches of 3 bars each, adjacent bars being connected in sequence to the lines of a three-phase 50 Hz voltage supply of 1400 VRMS line-to-line. A rotor consisting of a hollow cylinder of polyvinylchloride, the inside surface of which is coated with a thin layer of graphite, is placed inside the stator. The machine was found to be self-starting, and observations were made of its static and dynamic frictional torques, and its steady-state speed on no load. These observations furnished the quantitative data required for the prediction of the machine torque and power against rotor speed, based on a detailed analysis of its mode of operation. It is hoped that the information obtained from a study of this experimental machine will prove useful as a basis for the design of machines to be employed for practical purposes in the future.
-
Electrification of an isolated spherical object in the presence of an ion-flow field and air stream
- Author(s): S. Sumiyoshitani and M. Hara
- + Show details - Hide details
-
p.
339
–345
(7)
In the paper, the charge carrier motion around an isolated spherical object, in the presence of an electric field and an air stream crossing with the arbitrary angle in three dimensions, is analysed. Most analyses on charge carrier motion have mainly been conducted in two dimensions. The phenomena that cannot be simulated in two dimensions are not understood in detail. In the paper, the model and the calculated results, on examining the ion-flow electrification phenomenon as an example of the charge carrier motion are described. And the effects of the charge on the spherical object, the velocity of an air stream and the crossing angle between an electric field and an air stream on the limiting streamlines flowing in and the cross-sectional area of ions flowing in are studied.
-
New method for permittivity and conductivity inversion of discrete layered earth
- Author(s): E.A. Hashish ; M.M. Zahran ; M.N.I. Fahmy
- + Show details - Hide details
-
p.
346
–348
(3)
The paper presents a new method for inverting the permittivity and conductivity of systems of discrete layered media, where each individual layer is isotropic, homogeneous and characterised by its own permittivity and conductivity; the method also determines the physical thicknesses of individual layers. Compared to other methods, hitherto introduced by different authors, the new method is more accurate and yet much simpler. Besides, the new method which is based on fast Fourier transformation of surface-impedance data measured on top of a layered system, is associated with a new and elegant physical picture, where the transformed data are directly related to layer parameters. The authors thus proceed, in an iterative manner, determining the parameters of one layer after the other, starting from the top layer.
Most viewed content for this Journal
Article
content/journals/ip-a-2
Journal
5
5
Most cited content for this Journal
We currently have no most cited data available for this content.
