W artykule zwrócono uwagę na pewne problemy związane z zastosowaniem pochodnych ułamkowych w opisie zjawisk elektromagnetycznych oraz często popełniane przy tym błędy.
EN
The article focuses on some of the problems associated with the use of fractional derivatives in the description of electromagnetic phenomena, and common errors.
2
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
In the paper it is demonstrated that Maxwell’s equations in free space and transformation formulae for electromagnetic field can be derived from two postulates: (a) formula for Lorentz force, (b) Lorentz space-time transformations.
PL
W pracy wykazano, że równania Maxwella w próżni oraz wzory transformacyjne dla pola elektromagnetycznego można wyprowadzić z dwóch postulatów: (a) wzoru na siłę Lorentza, (b) czasoprzestrzennych transformacji Lorentza.
3
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
The contribution deals with a brief survey on selected parts of the theory and applications of multipole analysis in Electromagnetics. The theory will be explained exemplarily on the basis of the spherical-multipole analysis, including some remarks on the bilinear form of the dyadic Green's function and the addition theorems of the vector multipole functions. In addition to some well-known examples of multipole techniques in analytical as well as in computational Electromagnetics (canonical problems, near-field antenna measurements, fast multipole method), which are briefly revisited, the paper focuses on two more recent applications: A spherical-multipole based near-to-far-field transform for the Finite-Difference Time-Domain (FDTD) method, and an efficient hybrid multipole- and Method-of-Moments approach to efficiently solve for the field in a partly filled G-TEM cell model.
Much has been written about the possible health hazards of electromagnetic fields (EMRs). Consumers are bombarded with quasi-scientific reports, many of which are more confusing than accurate. This paper presents a project undertaken to evaluate high frequency electromagnetic fields using a TEM mode, the propagation mode calculation method followed by confirmation of any doubts about field levels using on-site measurements. An electromagnetic field can be monitored through all stages from the design to the operational state of the radiation source because of the use of both possible evaluation methods (calculation and measurements).
The paper deals with the problem of boundary condition formulation for an electromagnetic field. The nonlinear boundary condition has been proposed. This condition has been introduced on the basis of Maxwell's equations. The nonlinear condition includes three well-known boundary conditions of Dirichlet, Neumann and Hankel. An example has been provided to show the usefulness of the boundary condition proposed. The fourth boundary condition enables us to reduce the region of numerical analysis.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.