Electromagnetism cTopic Classical electromagnetism Electrodynamics An electromagneticfield also EMF ... . It affects the behavior of charged objects in the vicinity of the field. The electromagneticfield ... charges and currents interact with the electromagneticfield is described by Maxwell s equations ... Subatomic particle particle s. Structure of the electromagneticfield The electromagneticfield may ... through the electromagneticfield between any two locations. For instance, the metal atoms ... . Discrete structure The electromagneticfield may be thought of in a more coarse way. Experiments ... rise to quantum electrodynamics , a quantum field theory describing the interaction of electromagnetic ... field theory . Dynamics of the electromagneticfield In the past, electrically charged objects ... field. Once this electromagneticfield has been produced from a given charge distribution ... in size to the sources producing the above electromagneticfield, then a new net electromagneticfield will be produced. Thus, the electromagneticfield may be viewed as a dynamic entity that causes ... the radiation reaction force . The electromagneticfield as a feedback loop The behavior of the electromagnetic ... and magnetic fields fields act upon particles Lorentz force force due to electromagneticfield electric ... field There are different mathematical ways of representing the electromagneticfield ... field has a time dependence, then both fields must be considered together as a coupled electromagneticfield using Maxwell s equations . ref Electromagnetic Fields 2nd Edition , Roald K. Wangsness, Wiley ... force law governs the interaction of the electromagneticfield with charged matter. When ... a very practical feature of the electromagneticfield Faraday s Law may be stated roughly as a changing ... can be applied to generate a magnetic field and run an electric motor . Light as an electromagnetic ... the electromagnetic wave equation ref Field and Wave Electromagnetics 2nd Edition , David K. Cheng ... more details
of Pulsed ElectromagneticField Therapies. Electromagnetic Biology & Medicine 26.3 2007 257 274. Academic ... with pulsed electromagneticfield stimulation case report. Southern Medical Journal 97.5 2004 ... with instrumentation in patients treated with adjunctive pulsed electromagneticfield stimulation ... of Mississippi Pulsed electromagneticfield systems with FDA PMA include the EBI Bone Healing System ... emed Blue Cross & Blue Shield of Mississippi Pulsed electromagneticfield systems with FDA PMA include ..., prospective, and controlled clinical trial of pulsed electromagneticfield stimulation for cervical ... electromagneticfield PEMF treatment for fracture healing, Current Orthopaedic Practice. 20 ... A Role For Pulsed ElectromagneticField in the Treatment of Delayed Unions and Nonunions. The Internet ... Field Therapy.pdf History of Pulsed ElectromagneticField Therapy http www.healthy.net scr Article.asp ...File Rhumart MBI 3000 RESC Controller.JPG thumb 200px Drolet s 1990 Rhumart System, a Pulsed ElectromagneticField Therapy PEMF device. Pulsed ElectromagneticField Therapy PEMFT , also called Pulsed Magnetic Therapy , is a reparative technique most commonly used in the field of orthopedics for the treatment ... membrane level to alleviate pain, and increasing range of motion. The value of pulsed electromagneticfield therapy has been shown to cover a wide range of conditions, with well documented trials carried ... study of the efficacy of pulsed electromagnetic fields for interbody lumbar fusions. Spine 15.7 1990 708 712. MEDLINE. EBSCO. Web. 10 June 2010. ref History The use of magnetic field therapy ... of Fracture Repair by Electromagnetic Fields. A Surgically Noninvasive Method. Ann N Y Acad ... Coupled Electromagnetic Fields. Science 1974 184 575 7. ref ref Bassett CA, Pilla AA, Pawluk RJ. A non operative salvage of surgically resistant pseudarthroses and non unions by pulsing electromagnetic ... L, Pilla A. Repair of Non Unions by Pulsing Electromagnetic Fields. Acta Orthop Belg 1978 44 ... more details
Infobox book name A dynamical theory of the electromagneticfield title orig translator image include ... pages isbn oclc dewey congress preceded by followed by A Dynamical Theory of the ElectromagneticField ... Clerk Maxwell title A dynamical theory of the electromagneticfield url http upload.wikimedia.org wikipedia commons 1 19 A Dynamical Theory of the Electromagnetic Field.pdf format PDF journal Philosophical ... equations In part III of A Dynamical Theory of the ElectromagneticField , which is entitled General Equations of the ElectromagneticField , Maxwell formulated twenty equations ref name ADTEF which ... through the field according to electromagnetic laws. Maxwell s derivation of the electromagnetic wave ... Theory of the ElectromagneticField month March year 1996 isbn 1 57910 015 5 publisher Wipf and Stock ... Theory Of The ElectromagneticField Category 1860s in science Category Electromagnetism Category ... time, to derive the electromagnetic wave equation . ref name OPLF cite journal last Maxwell first ... rho partial t math Notation math mathbf H math is the magnetic field , which Maxwell called the magnetic ... field displacement field called the electric displacement by Maxwell . math rho math is the free charge ... potential called the angular impulse by Maxwell . math mathbf E math is the electric field called ... force sits alongside Maxwell s equations as an additional electromagnetic equation that is not included as part of the set. When Maxwell derives the electromagnetic wave equation in his 1864 paper, he uses equation D as opposed to using Faraday s law of electromagnetic induction as in modern ... he is deriving the electromagnetic wave equation, and he considers the situation only from the rest frame. Maxwell First to propose that light is an electromagnetic wave Image James Clerk Maxwell.jpg thumb right 175px Father of Electromagnetic Theory Image Postcard from Maxwell to Tait.jpg thumb right 175px A postcard from Maxwell to Peter Guthrie Tait Peter Tait . In A dynamical theory of the electromagnetic ... more details
Refimprove date July 2007 Near fieldelectromagnetic ranging NFER refers to any radio technology employing the near field properties of radio waves as a Real Time Location System RTLS . Overview Near fieldElectromagnetic radiation electromagnetic ranging is an emerging RTLS technology that employs transmitter tags and one or more receiving units. Operating within a half wavelength of a receiver, transmitter tags must use relatively low Frequency frequencies less than 30 mega M Hertz Hz to achieve ... is a significant hurdle that near fieldelectromagnetic ranging systems must overcome. Applications ..., C.W., F.P.S. Chin, and H.K. Garg, Multiple Frequencies for Accuracy Improvement in Near FieldElectromagnetic ... references External links http www.edn.com article CA150828.html Capps, Charles. Near Field or Far Field, EDN, August 16, 2001, pp. 95 102. http q track.com index.php location innovation nfer Introduction to Near FieldElectromagnetic Ranging http q track.com index.php location innovation technical papers Technical Papers on Near FieldElectromagnetic Ranging Category Radio technology ... phase relations between the EH components of an electro magnetic Vector fieldfield E and H are the components E Electric Field electric and H Magnetic Field magnetic vary with distance around small ... with James Clerk Maxwell Maxwell s Maxwell s equations field theory . Close to a small antenna, the electric and magnetic field components of a radio wave are 90 Degree angle degree s out of phase. As the distance ... in the far field , the EH phase difference goes to zero. ref Hertz, Heinrich. Electric Waves Being ... separately measure the electric and magnetic field components of a near field signal and compare their phases can measure the range to the transmitter. ref Schants, Hans. Near field phase behavior ... xpl freeabs all.jsp?isnumber 4022244&arnumber 4022272&count 556&index 26 ref See also Near field , a definition with the Hertz and Maxwell wave models Near Field Communication , a short range wireless ... more details
domain in which the electromagnetic fields reside. Two of the most common approaches in this first ... equation methods which instead require a discretization of only the sources of electromagneticfield. Those sources can be physical quantities, such as the surface charge density for the capacitance ... called a boundary element method BEM . For open problems, the sources of the field exist in a much ... journal IEEE Trans. on Electromagnetic Compatibility, volume 37 issue 4 pages 580 583 year 1995 ... author S. Kapur and D.E. Long title IES sup 3 sup Efficient electrostatic and electromagnetic simulation ..., Martin, and Scheffer, ISBN 0 8493 3096 3 A survey of the field of electronic design automation ... more details
There are various mathematical descriptions of the electromagneticfield that are used in the study of electromagnetism ... are discussed. Vector field approach main Classical electromagnetism The most common description of the electromagneticfield to use two three dimensional vector field s called the electric field and the magnetic field . These vector fields each have a value defined at every point of space and time ... partial 2 V partial t 2 4 pi e psi psi math Tensor field approach main Electromagneticfield tensor ... Speed of light Electric constant Magnetic constant Free space Near and far fieldElectromagneticfieldElectromagnetic flux Quantum electrodynamics Category Electromagnetism zh ... written as math E x, y, z, t electric field and math B x, y, z, t magnetic field . If only the electric field math E is non zero, and is constant in time, the field is said to be an electrostatic field . Similarly, if only the magnetic field math B is non zero and is constant in time, the field is said to be a magnetostatic field . However, if either the electric or magnetic field has a time dependence, then both fields must be considered together as a coupled electromagneticfield using Maxwell s equations . Maxwell s Equations in vector field approach main Maxwell s equations The behaviour of electric ... electromagnetic fields , is governed in a vacuum by Maxwell s equations math nabla cdot mathbf E ... to electromagnetic fields, these properties can be represented by tensors, with time dependence related to the material s ability to respond to fast field changes dispersion optics , Green Kubo relations , and possibly also field dependencies representing nonlinear and or nonlocal material responses ... field approach seealso Lorentz transformation Maxwell s equations, when they were first stated in their complete ... electric field zero in the transformation to the primed electric field. In this case, depending on the orientation of the magnetic field, the primed system could see an electric field, even though there is none ... more details
page Fourier expansion electromagneticfield timestamp 20110324131001 year 2011 month March day 24 substed yes For administrator use only Old AfD multi page Fourier expansion electromagneticfield date 24 March 2011 result keep End of AfD message, feel free to edit beyond this point The electromagnetic wave electromagnetic EM field is of importance as a carrier of solar energy and of electronic signals radio, TV, etc. . As its name suggests, it consists of two vector fields , the electric field E and the magnetic field B . The Fourier expansion of the electromagneticfield is used in the quantization of the electromagneticfield quantization that leads to photon s light particles of well defined ... field obeys one of the Maxwell equations, in electromagnetic SI units it reads, math boldsymbol nabla ... Fourier Expansion ElectromagneticField Category Electromagnetism ... that is, in free space , both E and B can be derived from a third vector field, the vector potential ... and B . Further the energy and momentum of the EM field will be expressed in the Fourier components of A . Fourier expansion of a vector field A real scalar function f x , with 0 &le x &le L , has the following ... consists of a term plus its complex conjugate and hence is real. For a real scalar field ... basis is used. When furthermore the expansion is applied to the three components of a vector field ... The magnetic field B satisfies the following Maxwell equations Maxwell equation math boldsymbol ... . A divergence free field, such as B , is a also referred to as a transverse field . By the Helmholtz ... are zero. The quantity sub 0 sub is the electric constant . Hence, also the electric field E is transverse. Since there are no charges, the electric potential is zero and the electric field follows ... i mathbf k cdot mathbf r right . math Fourier expanded energy The electromagnetic energy density is math mathcal E mathrm Field frac 1 2 epsilon 0 mathbf E cdot mathbf E frac 1 mu 0 mathbf B cdot ... more details
After quantization of the electromagneticfield , the EM electromagneticelectromagnetic wave field consists ... assumed heuristically in 1905 that an electromagneticfield consists of parcels of energy h &nu ... is a scalar field the Schr dinger field and can be quantized in the very same way as electromagnetic ... the required expansion of the field is the Fourier expansion. Electromagneticfield and vector potential See Fourier expansion electromagneticfield for more details. As the term suggests, an EM field consists of two vector fields, an electric field E r , t and a magnetic field B r , t . Both are time dependent vector field s that in vacuum depend on a third vector field A r , t the vector potential ... into the classical limit. Photon momentum Introducing the Fourier expansion electromagneticfield Fourier expansion of the electromagneticfield into the classical form math mathbf P textrm EM epsilon ... of the Schr dinger field is the second time quantization is performed, hence the name. ref ... took the phases of the different EM modes Fourier component s of the field and the mode energies ... vector , c is speed of light its electromagnetic momentum is k h 2 the polarization &mu ... starts with an expansion of a scalar of vector field or wave functions in a basis consisting ... . By doing this, the expanded field is converted into a fermion or boson operator field. The expansion ... r ,t 0 math which makes A into a Helmholtz decomposition transverse field . Clearly, the discrete infinite ... the vector potential. In the following they will be promoted to operators. Quantization of EM field ... field we do something similar. The quantity &epsilon sub 0 sub is the electric constant , which appears here because of the use of electromagnetic SI units. The quantization rules are math begin align ... . Hamiltonian of the field The classical Hamiltonian has the form math H frac 1 2 epsilon 0 iiint ... Substitution of the field operators into the classical Hamiltonian gives the Hamilton operator of the EM ... more details
wiktionary ElectromagneticElectromagnetic may refer to ElectromagneticfieldElectromagnetic force Electromagnetic radiation Electromagnetic spectrum Electromagnetic therapy alternative medicine , use of electromagnetism in alternative medicine Electromagnetism disambig ... more details
Electromagnetic therapy or Electromagneticfield therapy may refer to Bioelectromagnetics , the study of how electromagnetic fields interact with and influence biological processes. Electrotherapy , the use of electrical or electromagnetic energy in medicine Electromagnetic therapy alternative medicine , the use of electromagnetic radiation to treat disease. Evidence of efficacy is lacking. Pulsed ElectromagneticField Therapy , or PEMF , the use of weak electromagnetic fields to initiate osteogenesis . disambig ... more details
In telecommunication , the term electromagnetic environment EME has the following meanings For a telecommunications system , the spatial distribution of electromagneticfield s surrounding a given site. The electromagnetic environment may be expressed in terms of the spatial and temporal distribution of electric field strength volt s per metre , irradiance watt s per square metre , or energy density joule s per cubic metre . The resulting product of the Power physics power and time distribution, in various frequency ranges, of the radiated or conducted electromagnetic Emission electromagnetic radiation emission levels that may be encountered by a military force, system, or platform when performing its assigned mission in its intended operational environment. It is the sum of electromagnetic interference electromagnetic pulse hazards of electromagnetic radiation to personnel, ordnance, and volatile materials and natural phenomena effects of lightning and p static. Source FS1037C MS188 DODDIC Category Electromagnetic radiation Category Telecommunications telecomm stub pl rodowisko elektromagnetyczne ru ... more details
Orphan date February 2009 An Electromagnetism Electromagnetic Log , sometimes called an EM Log , measures the speed of a vessel through water. It operates on the principle that when a Electrical conductor conductor such as water passes through an electromagneticfield, a voltage is created and the amount of voltage created increases as the speed of the conductor increases. The process is the EM Log creates an electromagneticfield . a voltage is induced in the water the magnitude of the voltage varies depending upon the speed of the water flow past the sensor. the EM Log measures the voltage created and translates this into the vessel s speed through water. External links http www.agiltd.co.uk marine instrumentation agilog speed log Category Navigational equipment electronics stub ... more details
electromagnetism cTopic Electrodynamics An electromagnetic pump is a pump that moves liquid metal or any electrically conductive liquid magnetic material using electromagnetism . A magnetic field is set at right angles to the direction the liquid moves in, and a current is passed through it. This causes an electromagnetic force that moves the liquid. Applications include pumping liquid metal through a cooling system. electromagnetism stub Category Pumps ... more details
refimprove date March 2010 Image Electromagnetic shielding inside mobile phone.jpg thumb Electromagnetic shielding cages inside a disassembled mobile phone . Electromagnetic shielding is the process of reducing the electromagneticfield in a space by blocking the field with barriers made of electrical ... of Radio frequency radio waves , electromagnetic fields and electrostatic field s, though not static or low frequency magnetic field s Citation needed date October 2010 actually, disputed. Electrostatic ... of interest and the size, shape and orientation of apertures in a shield to an incident electromagneticfield. Materials used Typical materials used for electromagnetic shielding include sheet metal .... How electromagnetic shielding works Electromagnetic radiation consists of coupled electric field electric and magnetic field magnetic fields. The electric field produces force s on the electric charge charge carriers i.e., electron s within the conductor. As soon as an electric field is applied to the surface ... of charge inside the conductor that cancels the applied field inside, at which point the current stops. Similarly, varying magnetic field s generate eddy current s that act to cancel the applied magnetic field. The conductor does not respond to static magnetic fields unless the conductor is moving relative to the magnetic field. The result is that electromagnetic radiation is reflected from the surface ... thin , so in this case there is no electromagneticfield inside either. This is called the skin ... through which the cable runs. Electromagnetic shielding that blocks radio frequency electromagnetic ... layers One example is a shielded cable , which has electromagnetic shielding in the form of a wire ... electromagnetic and electrostatic fields. The door of a microwave oven has a screen built into the window ... electromagnetic shielding for computers and keyboards to prevent passive monitoring of keyboard ... Compromising Electromagnetic Emanations of Wired and Wireless Keyboards date 2009 06 01 author Martin ... more details
An Electromagnetism electromagnetic cavity is a cavity that acts as a container for electromagneticfield s such as photon s, in effect containing their wave function inside. The size of the cavity determines the maximum photon wave length that can be trapped. Additionally, it produces quantized energy level s for trapped charged particles like electrons and protons . The earth s magnetic field in effect places the earth in an electromagnetic cavity. Physical description of electromagnetic cavities Electromagnetic cavities are represented by potential well s, also called boxes , which can be of limited or unlimited depth V sub 0 sub . Quantum mechanic boxes are described by the time independent Schr dinger equation div align center math left frac hbar 2 2m nabla 2 V mathbf r right psi mathbf r E psi mathbf r math div with the additional boundary condition s the wave function is confined to the box infinite deep potential well or approaches zero as the distance from the wall increases to infinity, thus normalisable the wave function must be continuous function continuous the derivative of the wave function must be continuous which leads to real solutions for the wave functions if the net energy of the particle is negative., i.e. if the particle is in a bound state . Applications of electromagnetic cavities Electrons which are trapped in an electromagnetic cavity are in a bound state and thus organise themselves as they do in a regular atom , thus expressing chemical like behaviour. Several researchers have proposed to develop programmable matter by varying the number of trapped electrons in those cavities. http www.wired.com wired archive 9.10 atoms.html The discrete energy levels of electromagnetic cavities are exploited to produce photons of desired frequencies and thus are essential for nano or submicrometre scale laser devices. See also Cavity resonator Crab cavity Schumann resonance Optical cavity Quantum dot Category Electromagnetism ... more details
Electromagnetic Testing ET , as a form of nondestructive testing , is the process of inducing electric current s or magnetic field s or both inside a test object and observing the electromagnetism electromagnetic response. If the test is set up properly, a defect inside the test object creates a measurable response. The term Electromagnetic Testing is often intended to mean simply Eddy Current Testing ECT . However with an expanding number of electromagnetic and magnetic test methods, Electromagnetic Testing is more often used to mean the whole class of electromagnetic test methods, of which Eddy Current Testing is just one. Common Methods of Electromagnetic Testing Eddy Current Testing ECT is used to detect near surface cracks and corrosion in metallic objects such as tubes and aircraft fuselage and structures. ECT is more commonly applied to nonferromagnetic materials, since in ferromagnetic materials the skin effect depth of penetration is relatively small. Remote field testing RFT is used for nondestructive testing NDT of steel tubes and pipes. Magnetic flux leakage Magnetic flux leakage testing MFL is also used for nondestructive testing NDT of steel tubes and pipes. At present RFT is more commonly used in small diameter tubes and MFL in larger diameter pipes over long travel distances. Wire rope testing is MFL applied to steel cables, to detect broken strands of wire. Magnetic particle inspection MT or MPI is a form of MFL where small magnetic particles in the form of a powder or liquid are sprayed on the magnetized steel test object and gather at surface breaking cracks. Alternating Current Field Measurement ACFM is similar to eddy current applied to steel. Its most ... without removing insulation. References Hugo L. Libby, Introduction to Electromagnetic Nondestructive .... 5, http www.asnt.org publications handbook third 3et.htm Electromagnetic Testing . William Lord, http www.asnt.org publications materialseval June06d.pdf Electromagnetic NDT Techniques A 40 Year ... more details
Electromagnetic flux may refer to one of the following Flux or flux density of electromagnetic radiation Electric flux and magnetic flux . disambig ... more details
field is in a vertical plane and the magnetic field in a horizontal plane. The physics of electromagnetic ... for the electrodynamic electric field and magnetic field . These extra terms are responsible for electromagnetic ... say that the electromagnetic radiation field has an effective volumetric heat capacity given by math ... ElectromagneticfieldElectromagnetic pulse Electromagnetic radiation and health Electromagnetic ...Electromagnetism cTopic Classical electromagnetism Electrodynamics Electromagnetic radiation often abbreviated ... space. EMR has both electric field electric and magnetic field components, which oscillate in phase ... . Electromagnetic radiation is classified according to the frequency of its wave. In order of increasing ... ray s see Electromagnetic spectrum . The eye s of various organism s sense a small and somewhat variable window of frequencies called the visible spectrum . The photon is the quantum of the electromagnetic interaction and the basic unit of light and all other forms of electromagnetic radiation and is also the force carrier for the electromagnetic force. Electromagnetic radiation carries energy and momentum ... modes.png thumb Shows the relative wavelengths of the electromagnetic waves of three different colors ... Maxwell s equations James Clerk Maxwell first formally postulated electromagnetic waves . These were subsequently confirmed by Heinrich Hertz . Maxwell derived a Electromagnetic wave equation wave ... to Maxwell s equations , a time varying electric field generates a time varying magnetic field and vice versa . Therefore, as an oscillating electric field generates an oscillating magnetic field, the magnetic field in turn generates an oscillating electric field, and so on. These oscillating fields together form a propagating electromagnetic wave. A Quantum mechanics quantum theory of the interaction between electromagnetic radiation and matter such as electrons is described by the theory of quantum electrodynamics . Properties Image Onde electromagnetique.svg thumb left 350px Electromagnetic ... more details
Symptoms of ill health ascribed to electromagneticfield exposure a questionnaire survey journal ... Samadi, Gerald Ross title Electromagneticfield sensitivity journal Journal of Bioelectricity volume ... of susceptibility to electric field s, magnetic field s and various frequencies of electromagnetic ... almost every part of the body have been attributed to electromagneticfield exposure. A minority ... of symptoms attributed to electromagneticfield exposure a cross sectional representative survey in Switzerland ... electromagneticfield exposure and non specific symptoms of ill health a systematic review journal ...Electromagnetic hypersensitivity EHS , also referred to as electrohypersensitivity and electrical sensitivity ES , is a set of claims of adverse medical symptoms purportedly caused by exposure to electromagneticfield s. ref name who Although the thermal effects of electromagnetic fields on the body are established, self described sufferers of electromagnetic hypersensitivity report responding to non ionizing electromagnetic fields or electromagnetic radiation at intensities well below the limits ... described sufferers of electromagnetic hypersensitivity are unable to distinguish between exposure to real and fake electromagnetic fields, ref name RubinProvReview2005 ref name Roosli2008 and it is not recognized ... date September 2010 Symptoms and severity Initial reports of electromagnetic hypersensitivity in the medical ..., and recent surveys of electromagnetic hypersensitivity sufferers have found that base stations for mobile ... doi 10.1078 1438 4639 00269 ref Self described electromagnetic hypersensitivity sufferers tend ... Environmental Intolerance . ref name irvine2005 Levitt proposed ties between electromagnetic fields ... . ref Cite book last Levitt first B. Blake authorlink coauthors title Electromagnetic Fields ... pmid 15925670 doi 10.1016 j.puhe.2004.07.011 ref show that over 50 of people reporting electromagnetic .... Other authors have noted that people reporting severe electromagnetic hypersensitivity generally have ... more details
electromagneticfield around the work coil. The high work coil current typically tens or hundreds of thousands ... field created by rapidly discharging 2 kilojoules from a high voltage capacitor bank into a 3 turn coil of heavy gauge wire. Electromagnetic forming EM forming or magneforming is a type of high velocity ... field s that induce a current in the workpiece and a corresponding repulsive magnetic field, rapidly ... called high velocity forming . Explanation A rapidly changing magnetic field induces a circulating Electric current electrical current within a nearby conductor material conductor through electromagnetic induction . The induced current creates a corresponding magnetic field around the conductor ... and work coil strongly repel each other. Image Electromagnetic Forming 01.png thumb right When ... coil orange producing a rapidly changing magnetic field which induces a current to flow in the metallic ... field which rapidly repels the workpiece from the forming coil, reshaping the workpiece in this case ..., either by electromagnetic pulse crimping with a mechanical interlock or by magnetic pulse welding electromagnetic pulse welding with a true metallurgical weld. Since the forming operation involves ... Forming Electromagnetic forming has a number of advantages and disadvantages compared to conventional ... on the design of very large coils References cite web title Materials and Manufacturing Electromagnetic ... Electromagnetic Hemming Machine And Method For Joining Sheet Metal Layers work US Patent and Trademark ... accessdate 2005 09 02 cite web title Resources on Electromagnetic and High Velocity Forming work Department ... 7Edaehn hyperplasticity.html accessdate 2006 04 06 cite web title Electromagnetic Metal Forming Handbook ... title Industrial Application of the Electromagnetic Pulse Technology work PSTproducts GmbH url http ... 2010 08 01 cite web title Automotive Applications of Electromagnetic Pulse Technology EMPT work PSTproducts ... title Electromagnetic Dent Removal work Electroimpact url http www.electroimpact.com EMAGDR overview.asp ... more details
GEM is short for Gyrokinetic ElectroMagnetic . GEM is a gyrokinetic Plasma physics plasma turbulence simulation that uses the math delta f math particle in cell method. It is used to study waves, instabilities and nonlinear behavior of tokamak fusion plasmas. Information about GEM can be found at the GEM web page. ref http cips.colorado.edu simulation gem.htm Plasma Simulation Group Center for Integrated Plasma Studies Bot generated title ref There are two versions of GEM, one is a flux tube version ref A delta f method for gyrokinetic simulations with kinetic electrons and electromagnetic perturbuations, Y. Chen and S. Parker, J. Comp. Phys. 189 463 2003 . ref and the other one is a global general geometry version. ref Electromagnetic gyrokinetic delta f particle in cell turbulence simulation with realistic equilibrium profiles and geometry, Y. Chen and S. Parker, J. of Comp. Phys. 220 839 2007 ref Both versions of GEM use a field aligned coordinate system. Ions are treated kinetically, but averaged over their gyro obits and electrons are treated as drift kinetic. The modeling of the tokamak plasmas GEM solves the electromagnetic gyrokinetic equations which are the appropriate equations for well magnetized plasmas. The plasma is treated statistically as a kinetic distribution function. The distribution function depends on the three dimensional position, the energy and magnetic moment. The time evolution of the distribution function is described by Gyrokinetics gyrokinetic theory which simply averages the Vlasov equation The Vlasov Maxwell system of equations Vlasov Maxwell ... the magnetic field lines. This eliminates fast time scales associated with the gyromotion and reduces ... by the fast motion of electrons. GEM uses a novel electromagnetic algorithm allowing direct numerical simulation of the electromagnetic problem at high plasma pressures. GEM uses a two dimensional domain ... simulation index.htm DEFAULTSORT Gyrokinetic Electromagnetic Category Plasma physics Category ... more details
Cleanup date June 2010 Electromagnetic radiation weapons are a type of directed energy weapon s which use electromagnetic radiation to deliver heat, mechanical, or electrical energy to a target to cause various, sometimes very subtle, effects. They can be used against humans, electronic equipment, and military targets generally, depending on the technology. An electromagnetic pulse laser weapon can be used from up to 1.242 kilometers or over a mile away from a human and kill them with precise accuracy ... has lethal capabilities. When used against equipment, directed electromagnetic energy weapons can operate similarly to omnidirectional electromagnetic pulse EMP devices, by inducing destructive ... most directed and undirected EMP effects. When used against humans electromagnetic weapons can have ... of electromagnetic pulses emitted by laser induced plasma channels. According to Dr. Jonathan Moreno ... of the rat lab and into the testing the weapons in the field to measure the safety factors as well ... and hypervelocity physics related to electromagnetic weapons. ref Exploiting Technical Opportunities ... lethal, electromagnetic weapons can, under the right conditions or in the wrong hands, pose health ... non lethal weapons, electromagnetic weaponry poses health threats to humans&hl en&ct clnk&cd 2&gl us ref Some bio effects of electromagnetic radiation weapons include effects to the human central ..., vertigo, incontinence, nausea, disorientation, or other systemic discomfort. Electromagnetic radiation weapons may cause cumulative damage to the human body. Since electromagnetic weapons and the elecromagnetic ... by Matthew Swibel 04.23.07 Forbes.com ref Electromagnetic weapons, including high power microwaves ... used for other purposes. The degree of exposure to electromagnetic fields by Iraqi civilians and battlefield ... 26sub release id 3D11373 26view 3Dall electromagnetic weapons heart attacks&hl en&ct clnk&cd 1&gl ... Program DEFAULTSORT Electromagnetic Weapon Category Weapons Category Energy weapons cs Elektromagnetick ... more details
of electric devices for all customers should be ensured and the electromagneticfield strength should ... . The furniture has to be made of wood or plastic, and not metal Electromagnetic compatibility ... and reception of electromagnetic energy with reference to the unwanted effects Electromagnetic interference ... electromagnetic environment, of different equipment which use electromagnetic phenomena, and the avoidance .... Emission issues are related to the unwanted generation of electromagnetic energy by some source ... of unplanned electromagnetic disturbances. Interference, or noise, mitigation and hence electromagnetic compatibility is achieved primarily by addressing both emission and susceptibility ... of interference main Electromagnetic interference Electromagnetic interference divides into several ... Electromagnetic Pulse, EMP, also sometimes called Transient disturbance, arises where the source ... or even contact. Lightning Electromagnetic Pulse LEMP , although typically a short series of pulses. atomic nucleus Nuclear Electromagnetic Pulse NEMP , as a result of a nuclear explosion. Non Nuclear Electromagnetic Pulse NNEMP weapons. Electric power transmission Power Line Surges Pulses Sources ... EMI coupling modes.png thumb 450px center The four electromagnetic interference EMI coupling modes. There are four basic coupling mechanisms Electrical conductor conductive , Capacitor capacitive , Electromagnetic induction magnetic or inductive, and Electromagnetic radiation radiative . Any coupling ... Capacitive coupling occurs when a varying Electric field electrical field exists between two adjacent ... coupling Inductive coupling or magnetic coupling MC occurs when a varying magnetic field exists ... along the receiving conductor. Radiative coupling Radiative coupling or electromagnetic coupling .... Source and victim act as radio antennas the source emits or radiates an electromagnetic wave which ... The damaging effects of electromagnetic interference pose unacceptable risks in many areas of technology ... more details
us the change of the magnetic field with respect to time plus the Curl mathematics curl of the electric field is equal to zero or, alternatively, the curl of the electric field is equal to the negative change of the magnetic field with respect to time . With the electromagnetic tensor, the equations ... F gamma alpha 0 math The field tensor and relativity The field tensor derives its name from the fact that the electromagneticfield is found to obey the tensor transformation law , this general property ...electromagnetism cTopic Covariant formulation of classical electromagnetism Covariant formulation The electromagnetic tensor or electromagneticfield tensor sometimes called the field strength tensor , Faraday tensor or Maxwell bivector is a mathematical object that describes the electromagneticfield of a physical system in Maxwell s theory of electromagnetism . The field tensor was first used after ... In this article, the abstract index notation will be used. The electromagnetic tensor starts with the Electromagnetic ... is the speed of light . electric field Electric and magnetic field s are derived from the vector ... nabla phi , math math vec B vec nabla times vec A , math By definition, the electromagnetic tensor ... z c & B y & B x & 0 end bmatrix math Properties From the matrix form of the field tensor, it becomes clear that the electromagnetic tensor satisfies the following properties antisymmetric antisymmetry ... product of the field strength tensor a Lorentz invariant is formed math F mu nu F mu nu 2 left ... us that the divergence of the electric field vector is equal to the charge density, and the electrodynamic ... that is the change of the electric field with respect to time, minus the Curl mathematics curl of the magnetic field vector, is equal to negative 4 times the current density. These two equations ... may be written using the field tensor as math F alpha beta, gamma , 0 math and math F alpha beta ... Lagrange equation of motion for a field math partial nu left frac partial mathcal L partial partial ... more details
Electromagnetic Suspension EMS is the magnetic levitation of an object achieved by constantly altering the strength of a magnetic field produced by electromagnets . Magnetic levitation technology is important ... when placed in a pure electrostatic field or magnetostatic field. In these kinds of fields an unstable ... altering the current sent to electromagnets to change the strength of the magnetic field and allows ... field cannot levitate at stable equilibrium under the influence of electric forces ... and Applied Sciences, University of Sussex. Electromagnetic Suspension and Levitation. ref Likewise ... magnetic field with a system of permanent magnets or fixed current electromagnets . Braunbeck s extension ... train for routine service was opened in Birmingham, England in 1984, using electromagnetic suspension ... When a current passes through a wire, a magnetic field around that wire is generated. When the current through the wire stops, so does the previously generated magnetic field. The strength of the generated magnetic field is directly proportional to the strength of the current through the wire. When a wire is coiled, its generated magnetic field is concentrated through the center of the coil ... to maintain a magnetic field in an electromagnet, this field is easily manipulated by changing ... of Engineering and Applied Sciences, University of Sussex. Electromagnetic Suspension and Levitation. ref To reduce average power requirements, often the electromagnetic suspension is used only to stabilise ... in which a vehicle is suspended on a guiding rail by the principle of electromagnetic suspension. Maglev ... magnetic bearing AMB works on the principle of electromagnetic suspension and consists of an electromagnet ... DSP . Electromagnetic Suspension Device for wheeled transports Empty section date October 2010 Spaceship ... references External links BOSE Electromagnetic Suspension http www.bose.com controller?url automotive bose suspension index.jsp http magnetbahnforum.de index.php?inventors DEFAULTSORT Electromagnetic ... more details
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