LYCOS RETRIEVER
Search Results for "electromagnetic field"
There are 220 Retriever pages mentioning "electromagnetic field":
- Electromagnetism -- Fields
As mentioned in the Swan Orientation Film, Electromagnetism is or was one of the fields studied by the DHARMA Initiative. On the Island, the Swan station was presumably intended to serve this purpose before the incident. It is unclear whether the DHARMA Initiative was responsible for creating the Island's unique magnetic properties, or was merely researching them. - Electromagnetism
Electromagnetism Electromagnetism is one of the fundamental forms of energy in the Universe. It changes characteristics radically depending on its frequency and wavelength, which correlate closely with each other. The term "electromagnetism" comes from the fact that electric and magnetic fields are closely intertwined, and, under many circumstances, it is impossible to consider the two separately. For instance, a changing magnetic field gives rise to an electric field; this is the phenomenon of electromagnetic induction, which underlies the operation of transformers. A more familiar example of electromagnetism in action would be the pickup used in electric guitars. Electromagnetic guitar pickups use a coil of wire, which senses any changes in the magnetic field created by a small permanent magnet. - Maxwell's Equations -- Fields
Maxwell's equations in media with general constitutive relations are reformulated in covariant form as a system of divergence equations without constraints. This reformulation enables one to express general electro-magneto-fluid problems as hyperbolic systems in divergence form. The author illustrates this method on the MHD problem. In the absence of constraints, a general representation is derived for the characteristic form for first-order systems of quasi-linear partial differential equations in vector fields and scalars. Using this covariant formulation of characteristics, one finds that the principle of covariance imposes a very rigid structure on the infinitesimally small amplitude waves in MHD. To demonstrate the power of the reformulation, the authors study numerically ultra-relativistic wave breaking using the divergence formulation of MHD. - Quantum Field Theory -- Quantization
Quantum field theory originated in the 1920s from the problem of creating a quantum mechanical theory of the electromagnetic field. In 1926, Max Born, Pascual Jordan, and Werner Heisenberg constructed such a theory by expressing the field's internal degrees of freedom as an infinite set of harmonic oscillators and employing the usual procedure for quantizing those oscillators (canonical quantization). This theory assumed that no - Electrical Engineering -- Fields
Electrical engineering — sometimes referred to as [E]lectrical and electronic engineering — is an engineering field that deals with the study and application of electricity, electronics and electromagnetism. The field first became an identifiable occupation in the late nineteenth century after commercialization of the electric telegraph and electrical power supply. The field now covers a range of sub-studies including power, electronics, control systems, signal processing and telecommunications. - Quantum Theory -- Fields
Like classical physics, quantum theory sometimes describes light as a wave, because light behaves like a wave in many situations. Light is not a vibration of a solid substance, such as a rope. Instead, a light wave is made up of a vibration in the intensity of the electric and magnetic fields that surround any electrically charged object. - Quantum Field Theory
Quantum Field Theory (QFT) is the mathematical and conceptual framework for contemporary elementary particle physics. Since the very beginning of western philosophy reflections about the material world which go beyond the directly observable play a central role in philosophy. Starting with the presocratics it has always been a point of debate what the fundamental characteristics of the material world are. Is everything constantly changing or are there certain permanent features? What is basic and what is merely a matter of perspective and appearance? In the course of time various answers have been given and conflicting views have often been alternating in their predominance. - Quantum Field Theory -- Particles
Quantum Field Theory (QFT) is the general framework for the description of the physics of relativistic quantum systems, notably of elementary particles. It is the synthesis of Quantum Theory and Special Relativity, supplemented by the principle of Locality in space and time, and by the Spectral Condition in energy and momentum. Algebraic QFT (AQFT) emphasizes the role of algebraic relations among observables which determine, rather than quantum fields proper, a physical system. - Michael Faraday -- Fields
Michael Faraday was a chemist, physicist, and scientist of British descent who made notable contributions to the fields of electrochemistry and electromagnetism. He is ... the inventor of the device which has come to be known as the Bunsen burner, a device which is indispensable in scientific laboratories as an excellent heat source. - Quantum Theory -- Quantum Field Theories
Quantum field theory started with a theoretical framework that was built in analogy to quantum mechanics. Although there was no unique and fully developed theory, quantum field theoretical tools could be applied to concrete processes. Examples are the scattering of radiation by free electrons (“Compton scattering”), the collision between relativistic electrons or the production of electron-positron pairs by photons. Calculations to the first order of approximation were quite successful, but most people working in the field thought that QFT still had to undergo a major change. On the one side some calculations of effects for cosmic rays clearly differed from measurements. On the other side and, from a theoretical point of view more threatening, calculations of higher orders of the perturbation series led to infinite results.
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