41.
Historical Note on the Relativistic Theories of Electromagnetism
- Valeri V. Dvoeglazov
Nevertheless, many scientists felt some unsatisfactions with
both these theories since almost their appearance, see, e.g., refs. [2] and refs. [4--6]. In the
preface to the Dover edition of his book [7] A. Barut writes (1979): "Electrodynamics and the
classical theory of fields remain very much alive and continue to be the source of inspiration
for much of the modern research work in new physical theories" and in the preface to the
first edition he said about shortcomings in the modern quantum field theory. They are well
known. Furthermore, in spite of much expectation in the sixties and the seventies after
the proposal of the Glashow-Salam-Weinberg model...
42.
Cuestiones de Física. Electromagnetismo y Termodinámica
- Cuesta Gutiérrez, Manuel J.; Vila Muñoz, Jesús A.; Sierra Mora, Carlos J.; Agudo Pérez, Tomás
Este libro está escrito en forma de preguntas y respuestas. Los temas que refleja son los siguientes: 1. Campo eléctrico en el vacío. 2. Campo eléctrico en la materia. 3. Corriente continua. 4. Electromagnetismo. 5. Inducción electromagnética y corriente alterna. 6. Propiedades magnéticas de la materia. 7. Dilatación, termometría y calorimetría. 8. Termodinámica
43.
Cuestiones de Física. Electromagnetismo y Termodinámica
- Cuesta Gutiérrez, Manuel J.; Vila Muñoz, Jesús A.; Sierra Mora, Carlos J.; Agudo Pérez, Tomás
Este libro está escrito en forma de preguntas y respuestas. Los temas que refleja son los siguientes: 1. Campo eléctrico en el vacío. 2. Campo eléctrico en la materia. 3. Corriente continua. 4. Electromagnetismo. 5. Inducción electromagnética y corriente alterna. 6. Propiedades magnéticas de la materia. 7. Dilatación, termometría y calorimetría. 8. Termodinámica
44.
Interactive Freshman Electromagnetism
- Grover A. Swartzlander; Jr.; Lisa Lebduska
Electromagnetism is the most complete and tested branch of physics. Lacking knowledge of vector calculus and field theory, freshmen are introduced only to snippets of the full picture, and finish the course generally unenthusiastic about the role of electromagnetism in their lives. In response to a need for more interactive learning, we designed an electromagnetism course that incorporated writing-to-learn principles that allowed students to meld inclass theory with real-world practice. Course exercises included writing biographies or describing an electromagnetic phenomenon or device. Students "published" their drafts and final papers on the open-access web. This exercise necessitated that students understand principles...
45.
Física II. Termodinámica y Electromagnetismo
- Agudo Pérez, Tomás; Cuesta, Manuel; Díaz, José Luis; Vila, Jesús; Universidad de Cantabria. Escuela Universitaria de Ingeniería Técnica Minera
Este libro está dividido en trece capítulos, en los cuales se aborda el estudio de los siguientes temas: 1. Campo eléctrico en el vacío, 2. Campo eléctrico en la materia, 3. Corriente eléctrica contínua, 4. Electromagnetismo, 5. Propiedades magnéticas de la materia, 6. Inducción electromagnética, 7. Corrientes alternas, 8. Corriente eléctrica en medios no metálicos, 9. Termometría y dilatación de sólidos y líquidos, 10. El estado gaseoso, 11. Calorimetría y propagación del calor, 12. Primer principio de la Termodinámica, 13. Segundo principio de la Termodinámica
46.
Física II. Termodinámica y Electromagnetismo
- Agudo Pérez, Tomás; Cuesta, Manuel; Díaz, José Luis; Vila, Jesús; Universidad de Cantabria. Escuela Universitaria de Ingeniería Técnica Minera
Este libro está dividido en trece capítulos, en los cuales se aborda el estudio de los siguientes temas: 1. Campo eléctrico en el vacío, 2. Campo eléctrico en la materia, 3. Corriente eléctrica contínua, 4. Electromagnetismo, 5. Propiedades magnéticas de la materia, 6. Inducción electromagnética, 7. Corrientes alternas, 8. Corriente eléctrica en medios no metálicos, 9. Termometría y dilatación de sólidos y líquidos, 10. El estado gaseoso, 11. Calorimetría y propagación del calor, 12. Primer principio de la Termodinámica, 13. Segundo principio de la Termodinámica
47.
Sparse Symmetric Preconditioners for Dense Linear Systems in Electromagnetism
- B. Carpentieri,I. S. Du,L. Giraud,M. Magolu Made
We consider symmetric preconditioning strategies for the iterative solution of dense
complex symmetric non-Hermitian systems arising in computational electromagnetics. In
particular we report on the numerical behaviour of the classical Incomplete Cholesky
factorization as well as some of its recent variants and consider also well known factorized
approximate inverses. We illustrate the di#culties that those techniques encounter on
the linear systems under consideration and give some clues to explain their disappointing
behaviour. We propose two symmetric preconditioners based on Frobenius-norm minimization
that use a prescribed sparsity pattern. The numerical and computational e#ciency of the
proposed preconditioners are illustrated on a set of model problems arising both from academic
and...
48.
Un-renormalized Classical Electromagnetism
- Ibison, M.
This paper follows in the tradition of direct-action versions of
electromagnetism having the aim of avoiding a balance of infinities wherein a
mechanical mass offsets an infinite electromagnetic mass so as to arrive at a
finite observed value. Given that, in this respect the direct-action approached
ultimately failed because its initial exclusion of self-action was found to be
untenable in the relativistic domain, this paper continues the tradition
considering instead a version of electromagnetism wherein mechanical action is
excluded and self-action is retained. It is shown that the resulting theory is
effectively interacting due to the presence of infinite forces. A vehicle for
the investigation is a pair of...
49.
Gravitation and Electromagnetism
- Sidharth, B. G.
The realms of gravitation, belonging to Classical Physics, and
Electromagnetism, belonging to the Theory of the Electron and Quantum Mechanics
have remained apart as two separate pillars, inspite of a century of effort by
Physicists to reconcile them. In this paper it is argued that if we extend
ideas of
Classical spacetime to include in addition to non integrability non
commutavity also, then such a reconcilation is possible.
50.
Física : electromagnetismo y materia = The Feynman Lectures on Physics : Mainly Electromagnetism and Matter
- Feynman, Richard P.; Leighton, Robert B.; Sands, Matthew
Traducción de: The Feynman Lectures on Physics, Mainly Electromagnetism and Matter
51.
Electromagnetism in moving, conducting media
- Kalafus, R. M.
Electromagnetism in moving, conducting media - solution to problems involving static and radiation fields of static charges, and radiation fields of harmonic current sources
52.
Comments on the Unification of Electromagnetism and Gravitation through "Generalized Einstein manifolds"
- Gravitation Through
H. Akbar-Zadeh has recently proposed (J Geom Phys 17 (1995) 342) a new geometric formulation
of Einstein--Maxwell system with source in terms of what are called "Generalized
Einstein manifolds". We show that, contrary to the claim, Maxwell equations have not been
derived in this formulation and that, the assumed equations can be identified only as sourcefree
Maxwell equations in the proposed geometric set up. A genuine derivation of source-free
Maxwell equations is presented within the same framework. We draw a conclusion that the
proposed unification scheme can pertain only to source-free situations.
Keywords: Generalized Einstein manifolds; Finsler Geometry; Einstein--Maxwell system
1991 MSC: 83Exx, 83C22
PACS: 04.40.Nr, 04.50.+h
In a recent...
53.
Sparse pattern selection strategies for robust Frobenius norm minimization preconditioners in electromagnetism
- B. Carpentieri,L. Giraud
We consider preconditioning strategies for the iterative solution of dense complex
symmetric non-Hermitian systems arising in computational electromagnetics. We consider
in particular sparse approximate inverse preconditioners that use a static nonzero pattern
selection. The novelty of our approach comes from using a dierent nonzero pattern selection
for the original matrix from that for the preconditioner and from exploiting geometric or
topological information from the underlying meshes instead of using methods based on
the magnitude of the entries. The numerical and computational eciency of the proposed
preconditioners are illustrated on a set of model problems arising both from academic and
from industrial applications. The results of our numerical experiments...
54.
A Reconciliation of Electromagnetism and Gravitation
- Sidharth, B. G.
It is argued that once we consider the underpinning of a Non Commutative
geometry, itself symptomatic of extended particles, for example in Quantum
Superstring theory, then a reconciliation between gravitation and
electromagnetism is possible.
55.
General Geometry and Geometry of Electromagnetism
- Shahverdiyev, Shervgi S.
It is shown that Electromagnetism creates geometry different from Riemannian
geometry. General geometry including Riemannian geometry as a special case is
constructed. It is proven that the most simplest special case of General
Geometry is geometry underlying Electromagnetism. Action for electromagnetic
field and Maxwell equations are derived from curvature function of geometry
underlying Electromagnetism. And it is shown that equation of motion for a
particle interacting with electromagnetic field coincides exactly with equation
for geodesics of geometry underlying Electromagnetism.
56.
Inside Perspectives on Classical Electromagnetism
- Pettersson, Leif
The concept "Classical Electromagnetism" in the title of the paper here
refers to a theory built on three foundations: relativity principles, the
original Maxwell's equations, and the mathematics of exterior calculus. In this
theory of electromagnetism the general laws are expressed as geometric
(coordinate-free) relations between quantities on a four-dimensional spacetime
manifold. Based on these laws, and exterior calculus on metric spaces, we
derive fields and relations that describe electromagnetism from the inside
perspective of Lorentz observers, inside the Minkowski spacetime (the ordinary
flat spacetime). It is shown how fields and relations defined on the spacetime
are sliced into three-dimensional fields and relations on time slices, and that
Lorentz observers...
57.
Electrotecnia básica para ingenieros. Primera parte : electromagnetismo y electrocinética
- Gurrutxaga Ruiz, José Antonio de; Universidad de Cantabria. Departamento de Ingeniería Eléctrica y Energética
El libro trata en su primera parte,y a lo largo de diez capítulos, los conceptos generales sobre los campos electromagnéticos y la corriente eléctrica, las deducciones prácticas a partir de estos conceptos: teoremas y leyes fundamentales del electromagnetismo, y la energía en el campo electromagnético. En una segunda parte, desarrolla a lo largo de nueve apéndices, conceptos y cuestiones a cerca de: la teoría de campos, el fenómeno eléctrico, la electrotecnia y la corriente eléctrica, el fenómeno magnético, los medios, teoremas y leyes fundamentales de los campos electromagnéticos constantes, el fenómeno de la inducción electromagnética y, acerca de las energías...
58.
Electrotecnia básica para ingenieros. Primera parte : electromagnetismo y electrocinética
- Gurrutxaga Ruiz, José Antonio de; Universidad de Cantabria. Departamento de Ingeniería Eléctrica y Energética
El libro trata en su primera parte,y a lo largo de diez capítulos, los conceptos generales sobre los campos electromagnéticos y la corriente eléctrica, las deducciones prácticas a partir de estos conceptos: teoremas y leyes fundamentales del electromagnetismo, y la energía en el campo electromagnético. En una segunda parte, desarrolla a lo largo de nueve apéndices, conceptos y cuestiones a cerca de: la teoría de campos, el fenómeno eléctrico, la electrotecnia y la corriente eléctrica, el fenómeno magnético, los medios, teoremas y leyes fundamentales de los campos electromagnéticos constantes, el fenómeno de la inducción electromagnética y, acerca de las energías...
59.
Some sparse pattern selection strategies for robust Frobenius norm minimization preconditioners in electromagnetism
- Bruno Carpentieri,Iain S. Duff,Luc Giraud
We consider preconditioning strategies for the iterative solution of dense complex symmetric nonHermitian
systems arising in computational electromagnetics. We consider in particular sparse
approximate inverse preconditioners that use a static nonzero pattern selection. The novelty
of our approach comes from using a different nonzero pattern selection for the original matrix
from that for the preconditioner and from exploiting geometric or topological information from
the underlying meshes instead of using methods based on the magnitude of the entries. The
numerical and computational efficiency of the proposed preconditioners are illustrated on a set
of model problems arising both from academic and from industrial applications. The results of
our numerical experiments...
60.
RAL-TR-2002-016 Sparse symmetric preconditioners for dense linear systems in electromagnetism
- Bruno Carpentieri,Iain S. Duff,Luc Giraud
We consider symmetric preconditioning strategies for the iterative solution
of dense complex symmetric non-Hermitian systems arising in computational
electromagnetics. In particular we report on the numerical behaviour of the classical
Incomplete Cholesky factorization as well as some of its recent variants and consider
also well known factorized approximate inverses. We illustrate the difficulties that
those techniques encounter on the linear systems under consideration and give
some clues to explain their disappointing behaviour. We propose two symmetric
preconditioners based on Frobenius-norm minimization that use a prescribed
sparsity pattern. The numerical and computational efficiency of the proposed
preconditioners are illustrated on a set of model problems arising both from academic
and from...
