wiktionary ElectromagneticElectromagnetic may refer to Force Electromagnetism , one of four fundamental forces See also Electromagnetic field ElectromagneticforceElectromagnetic radiation Electromagnetic induction Electromagnetic spectrum Electromagnetic therapy alternative medicine , use of electromagnetism in alternative medicine Electromagnetic weapon , a type of weapon Electromagnetic propulsion Electromagnetic pulse Electromagnetic levitation Electromagnetic shielding disambig ... more details
Orphan date February 2009 Electromagnetic buoyancy EMB is a force that opposes Lorentz force EMW during electromagnetic phoresis of small particles or droplets in an aqueous medium. Though this force is still being researched, it has been clearly observed in experimental procedures. Category Electromagnetism electromagnetism stub ... more details
In telecommunication , the term electromagnetic environment EME has the following meanings For a telecommunications system , the spatial distribution of electromagnetic field 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
electromagnetism cTopic Electrodynamics An electromagnetic pump is a pump that moves liquid metal or any electrically conductive liquid 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 electromagneticforce that moves the liquid. Applications include pumping liquid metal through a cooling system. See also Electromagnetic flow meter Molten salt References references Bibliography R. S. Baker Handbook of Electromagnetic pump technology External links http lecturedemo.ph.unimelb.edu.au Electricity Magnetism Forces fields from currents Ea 5 The Electromagnetic Pump demo http www.comsol.com papers 9352 http www.carli ea.com eng c3b.htm Category Pumps electromagnetism stub ro Pomp electromagnetic ... 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
. The way in which charges and currents interact with the electromagnetic field is described by Maxwell s equations and the Lorentz force law . From a Classical physics classical perspective, the electromagnetic ... Force Law Lorentz force law . This discussion ignores the radiation reaction force . Electromagnetic ... due to electromagnetic field electric force same direction as electric field magnetic force perpendicular ... by complex numbers, or tensors. The Lorentz force law governs the interaction of the electromagnetic ...Merge from Flux density discuss Talk Electromagnetic field Merger proposal Flux density date October 2011 Electromagnetism Topic Classical electromagnetism Electrodynamics An electromagnetic field also ... objects . It affects the behavior of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and describes the electromagnetism electromagnetic interaction . It is one of the four fundamental force s of nature the others are gravitation , the weak ... Subatomic particle particle s. Citation needed date May 2011 Structure of the electromagnetic field The electromagnetic field may be viewed in two distinct ways a continuous structure or a discrete ..., energy is viewed as being transferred continuously through the electromagnetic field between any ... at high frequencies see ultraviolet catastrophe . Discrete structure The electromagnetic field may be thought of in a more coarse way. Experiments reveal that in some circumstances electromagnetic energy ... effect the emission of electrons from metallic surfaces subjected to electromagnetic radiation the photon ... electrons. This quantum picture of the electromagnetic field which treats it as analogous to harmonic ... field theory describing the interaction of electromagnetic radiation with charged matter. It also gives ... is modelled using quantum mechanics rather than quantum field theory . Dynamics of the electromagnetic ... thought of as two parts of a greater whole the electromagnetic field. Once this electromagnetic ... more details
electromagneticforce to apply mechanical resistance friction . The original name was electro mechanical brakes but over the years the name changed to electromagnetic brakes , referring ... remains the same. Both electromagnetic brakes and eddy current brake s use electromagneticforce but electromagnetic brakes ultimately depend on friction and eddy current brakes use magnetic force directly. Applications In locomotives, a mechanical linkage transmits torque to an electromagnetic braking component. Tram s and train s use electromagnetic track brake s where the braking element is pressed by magnetic force to the Rail tracks rail . They are distinguished from mechanical track ...Refimprove All references are from a single source commercial site ogura clutch.com date June 2011 Electromagnetic ... and robotic applications also employ electromagnetic brakes. Types Single face brake Image A 3 electromagnetic brake1.gif thumb 150px right A 3 Electromagentic brake Main Friction plate electromagnetic ... members of the clutch. Single face electromagnetic brakes make up approximately 80 of all of the power applied brake applications. Power off brake Image Electromagnetic Power Off Brake.gif thumb ... plate. This frictional clamping force is transferred to the hub, which is mounted to a shaft. Permanent magnet type A permanent magnet holding brake looks very similar to a standard power applied electromagnetic ... Electromagnetic Particle Brake.gif thumb 175px right Magnetic Particle Brake Magnetic particle brakes ... force is created on the rotor, slowing, and eventually stopping the output shaft. When electricity ... power brake Image Electromagnetic Hysteresis Power Brake.gif thumb 150px left Electomagnetic ... is free to turn, and no relative force is transmitted between either member. Therefore, the only torque ... electromagnetic brake1.gif thumb 175px right Electromagnetic Multiple Disk Brake Multiple disk brakes ... Electromagnetic clutch References reflist DEFAULTSORT Electromagnetic Brake Category Brakes Category ... more details
Interventions infobox Name Electromagnetic therapy Image Caption ICD10 ICD10PCS 6A2 6 A 2 ICD9 MeshID D055909 OPS301 OtherCodes HCPCSlevel2 Electromagnetic therapy or Electromagnetic field therapy refers to therapy involving the use of magnet s or electromagnets . Types include 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 Electromagnetic Field Therapy , or PEMF , the use of weak electromagnetic fields to initiate osteogenesis . See also Magnet therapy , use of static magnetic field s with the aim of treating disease. Evidence of efficacy is lacking. Extracorporeal assistance, performance, and therapy medicine stub Category Medical procedures Category Electromagnetism ... more details
page Electromagnetic weapon timestamp 20120425004332 year 2012 month April day 25 substed yes For administrator use only Old AfD multi page Electromagnetic weapon date 25 April 2012 result keep End of AfD ... Electromagnetic radiation weapons are a type of directed energy weapon s which use electromagnetic ... Research, conducted a study begun in 2004 called the Sensory Consequences of Electromagnetic ... to advance Classical electromagnetism electrodynamics and hypervelocity physics related to electromagnetic ... a non lethal electromagnetic weapon for the purpose of crowd dispersal. ref http www.nytimes.com 2001 ... and electronics When used against equipment, directed electromagnetic energy weapons can operate similarly to omnidirectional electromagnetic pulse EMP devices, by inducing destructive voltage within ... forbes 2007 0423 042.html Light Warfare by Matthew Swibel 04.23.07 Forbes.com ref Electromagnetic ... to electromagnetic fields by Iraqi civilians and battlefield troops is unknown. ref U.S. Senate Committee ... index.cfm 3Fpageid 3D16 26release id 3D11326 26sub release id 3D11373 26view 3Dall electromagnetic ... electromagnetic weapons can have dramatic effects, such as the intense burning sensation caused by Raytheon ... include Capability to influence an enemy force or population to flee rather than to stand and fight ... a feeling of overwhelming drowsiness on an already weary enemy force. Ability to deprive an enemy force of sound, uninterrupted sleep for a prolonged period. Capability to persuade, indirectly, the close ..., electromagnetic weapons can pose health threats to humans. ref Air University Research Template NON ... Center for Strategy and Technology Air War College Air University Maxwell Air Force Base, Alabama ... 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 nervous ... breathing, vertigo, incontinence, nausea, disorientation, or other systemic discomfort. Electromagnetic ... more details
Electromagnetic mass was initially a concept of classical mechanics , denoting as to how much the electromagnetic ... forms of energy, including electromagnetic energy, is interpreted on the basis of Albert Einstein ..., some problems concerning the electromagnetic mass and self energy of charged particles are still ... the electromagnetic luminiferous aether aether of James Clerk Maxwell , is harder to set in motion ... behaves as having some sort of momentum and apparent electromagnetic mass, which can increase the ordinary mechanical mass of the bodies, or in more modern terms, the increase should arise from their electromagnetic ... applied to the electron by using the Abraham Lorentz force . Now, the electrostatic energy ... infinite energy accumulation. Thus the formula for this electromagnetic energy mass relation is math ... to the conclusion that the total mass of the bodies is identical to its electromagnetic mass. Wien stated, that if it is assumed that gravitation is an electromagnetic effect too, then there has to be a proportionality between electromagnetic energy, inertial mass, and gravitational mass. When one body attracts another one, the electromagnetic energy store of gravitation is according to Wien diminished ... in 1906 argued that when mass is in fact the product of the electromagnetic field in the aether implying ... Thomson and Searle Thomson 1893 noticed that electromagnetic momentum and energy of charged ... through the dielectric beyond that of light. In 1897, Searle gave a more precise formula for the electromagnetic ... Bucherer.svg thumb 300px Abraham Lorentz Bucherer Predictions of speed dependence of transverse electromagnetic ..., Walter Kaufmann physicist Walter Kaufmann 1901 and Abraham 1902 derived the formula for the electromagnetic ..., that the electromagnetic mass also depends on the direction of the moving bodies with respect to the aether ... ref Poincar stresses and 4 3 problem The idea of an electromagnetic nature of matter, however, had to be given up. Abraham 1904, 1905 ref name abraham04 argued that non electromagnetic forces were ... 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 electromagnetic field in a space by blocking the field with barriers made of electrical ... which the cable runs. Electromagnetic shielding that blocks radio frequency electromagnetic radiation ... frequency radio waves , electromagnetic fields and electrostatic field s. A conductive enclosure ... electromagnetic field. Materials used Typical materials used for electromagnetic shielding include ... and other layers One example is a shielded cable , which has electromagnetic shielding in the form ... shielding of both electromagnetic and electrostatic fields. The door of a microwave oven has a screen ... . Citation needed date August 2011 NATO specifies electromagnetic shielding for computers and keyboards ... journal url http lasecwww.epfl.ch keyboard title Compromising Electromagnetic Emanations of Wired ... at the AM, FM or TV broadcast facilities. How electromagnetic shielding works Electromagnetic ... field produces force s on the electric charge charge carriers i.e., electron s within the conductor ... magnetic fields unless the conductor is moving relative to the magnetic field. The result is that electromagnetic .... Any holes in the shield force current to flow around them, so that fields passing through the holes do not excite opposing electromagnetic fields. These effects reduce the field reflecting capability of the shield. In the case of high frequency electromagnetic radiation, the above mentioned ..., is absorbed by the skin unless it is extremely thin , so in this case there is no electromagnetic ... mu 1 math . ref J.D. Jackson. Classical Electrodynamics, Third Ed. Section 5.12 ref See also Electromagnetic interference Electromagnetic radiation and health Radiation Ionising radiation protection ... Practical Shielding.html Practical Electromagnetic Shielding Tutorial http www.comsol.com papers ... more details
force to operate the clutch. It is a type of semi automatic transmission . Electromagnetic clutches ...unref date August 2011 Electromagnetic clutches operate electrically, but transmit torque mechanically ... known as electromagnetic versus electro mechanical, referring more about their actuation method versus .... Single face clutches make up approximately 90 of all electromagnetic clutch sales. The electromagnetic .... It has fast, smooth operation. However, because energy dissipates as heat in the electromagnetic ... plate clutch Main Friction plate electromagnetic couplings A friction plate clutch uses a single plate friction surface to engage the input and output members of the clutch. How it works Image B 1 electromagnetic ... and a frictional force is generated at contact. Within a relatively short time, the load is accelerated ... automation. Automobiles When the electromagnetic clutch is used in automobiles , there may be a clutch ... to individual wheels or axles. A smaller electromagnetic clutch connects the air conditioning compressor ... Electromagnetic clutches have been used on diesel locomotive s, e.g. by Hohenzollern Locomotive Works . Other types of electromagnetic clutches Multiple disk clutches Image Multiple Disk Clutch.gif .... Electromagnetic tooth clutches Image Electromagnetic Tooth Clutch.gif thumb 200px right Electromagnetic tooth clutch Introduction Of all the electromagnetic clutches, the tooth clutches provide the greatest ... otherwise damage to the clutch teeth would occur when trying to engage the clutch. How it works Electromagnetic ... from input to output. Electromagnetic particle clutches Main magnetic particle clutch Image Electromagnetic Particle Clutch.gif thumb 200px left Electromagnetic particle clutch Introduction ... range of any electromagnetic product. Most applications involving powered hysteresis units are in test ... current is removed from the clutch, the armature is free to turn and no relative force is transmitted ... drag. See also Electromagnetic brake References reflist W. Pelczewski SPRZEGLA ELEKTROMAGNETYCZNE ... more details
In telecommunication , electromagnetic survivability is the ability of a system , subsystem, or equipment to resume functioning without evidence of Degradation telecommunications degradation following temporary exposure to an adverse electromagnetic environment . The system, subsystem, or equipment performance may be degraded during exposure to the adverse electromagnetic environment, but the system will not experience permanent damage, such as electronic component component burnout, that will prevent proper operation when the adverse electromagnetic environment is removed. References FS1037C MS188 Category Telecommunications telecommunications stub ... more details
determines the holding force which characterizes the lock Micro Size convert 300 lbf N abbr on lk on holding force. Mini Size convert 600 lbf N abbr on holding force Midi Size convert 800 lbf N abbr on holding force Standard Size convert 1200 lbf N abbr on holding force. The standard size electromagnetic ...For a lock utilizing magnetism and a key magnetic keyed lock An electromagnetic lock , magnetic lock ... assembly The first modern direct pull electromagnetic lock was designed by S. I. Saphirstein in 1969 ... a fire incident. Saphirstein initially proposed to use a linear stack of door holders to work as an electromagnetic ... for electromagnetic locks. Under difficult business conditions, Locknetics was later sold to the Ives ..., went on to form other electromagnetic lock companies, including Dynalock Corporation and Security Engineering Co. Saphirstein continued developing electromagnetic locking technologies at other ... were later established to create additional product offerings for the direct pull electromagnetic lock. Other variations and improvements on the electromagnetic locks have been developed. One of these designs ... shear electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security ... and now ubiquitous direct pull electromagnetic lock, which normally either works in an in swinging ... . Essentially it consists of an electromagnet attracting a conductor with a force ... is given by the equation math B frac mu 0 mu rIN l math The force math F math between the electromagnet ... a strong magnetic lock. For example, the force of the lock is proportional to the square of the relative ... the choice of locking system, fire safety is an important consideration. ref phillips Holding force ... to adjust the space between the door and lock. The principle behind the electromagnetic lock ... of a solenoid . The holding force should be a collinear load and the lock and armature plate ... between voltage and holding force. When the current is fixed, voltage is proportional to power ... more details
electromagnetism cTopic Classical electromagnetism Electrodynamics Electromagnetic induction is the production of an electric current across a Electrical conductor conductor moving through a magnetic field . It underlies the operation of electrical generator generator s, transformer s, induction motor s, electric motor s, synchronous motor s, and solenoid s. ref cite web author date 1999 22 07 title Applications of electromagnetic induction url http physics.bu.edu duffy py106 Electricgenerators.html publisher Boston University accessdate ref Michael Faraday is generally credited with the discovery of induction in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829. ref cite book title Hans Christian rsted and the romantic legacy in science ideas, disciplines, practices author S M Dhir url http books.google.co.in books?id ZgpmpOOHm80C&pg PA350&dq Francesco Zantedeschi electromagnetic induction&hl en&sa X&ei 6l0pT4K1GsXprAfguYmUAw&ved 0CD0Q6AEwAQ v onepage&q Francesco 20Zantedeschi 20electromagnetic 20induction&f false chapter 6 Other posive results and criticism publisher Springer year 2007 isbn 978 1 4020 2987 5 ref Around 1830 ref cite web author date title Magnets url http library.thinkquest.org 13526 c3c.htm publisher Oracle Thinkquest ThinkQuest accessdate 2009 11 06 ref to 1832 ref cite web author date title Joseph Henry url http www.nndb.com ... of induction Michael Faraday formulated that electromotive force EMF produced around a closed path ... B over dt , math where math scriptstyle mathcal E math is the electromotive force &Phi sub B sub ... 20 ref Applications The principles of electromagnetic induction are applied in many devices and systems, including columns list 3 Current clamp Electrical generator s Electromagnetic forming Graphics ... Lenz s Law at work . DEFAULTSORT Electromagnetic Induction Category Electrodynamics interwiki ar ... pt Indu o eletromagn tica ru simple Electromagnetic induction ... more details
for example, Electromagnetic forming An electromagnetic pulse sometimes abbreviated EMP is a burst of electromagnetic radiation . The abrupt pulse of electromagnetic radiation usually results from certain ... as a high altitude electromagnetic pulse HEMP device. Effects of a HEMP device depend on a very ... , gamma ray output, interactions with the Earth s magnetic field , and electromagnetic shielding of targets. History The fact that an electromagnetic pulse is produced by a nuclear explosion was known ... due to Enrico Fermi Enrico Fermi s expectation of an electromagnetic pulse from the detonation ... on Electromagnetic Compatibility. Vol. 49, No. 2. pp. 211&ndash 218. May 2007. http www.ece.unm.edu summa notes History BaumReminiscences.pdf ref ref name baum2 Baum, Carl E., From the Electromagnetic ... about nuclear electromagnetic pulse in 1981 by William Broad William J. Broad in the weekly publication ... provided electromagnetic pulse data that was clear enough to enable physicists to accurately identify the physical mechanisms that were producing the electromagnetic pulses. ref name nbcreport ... extinguished ref Rabinowitz, Mario 1987 Effect of the Fast Nuclear Electromagnetic Pulse on the Electric ... Electromagnetic Pulse HEMP IEEE Transactions on Electromagnetic Compatibility, Vol. 40, No. 4, November ... , Electromagnetic Environments and Consequences Proceedings of the EUROEM 94 International Symposium ... generator for generating a non nuclear electromagnetic pulse was conceived as early as 1951 by Andrei ... nations. Characteristics of nuclear EMP The case of a nuclear electromagnetic pulse differs from other kinds of electromagnetic pulse EMP in being a complex electromagnetic multi pulse. The complex multi ... 020728 Electromagnetic compatibility EMC Part 2 Environment Section 9 Description of HEMP environment ... EMP. The E1 component is a very brief but intense electromagnetic field that can quickly induce ... s magnetic field and the downward electron flow produces a very large, but very brief, electromagnetic ... more details
at right angles to magnetic flux in accordance with Lorentz force. ref Friauf, J. B. 1961 . Electromagnetic ...Electromagnetic propulsion EMP , is the principle of accelerating an object by the utilization of a flowing electrical current and magnetic fields. The electric current electrical current is used to either ... known that when a current flows through a electrical conductor conductor in a magnetic field, an electromagneticforce known as a Lorentz force , pushes the conductor in a direction perpendicular to the conductor and the magnetic field. This repulsing force is what causes propulsion in a system designed to take advantage of the phenomenon. The term electromagnetic propulsion EMP can be described by its individual components electromagnetic using electricity to create a magnetic field electromagnetism ... of electromagnetic propulsion does not have origins with any one individual and has applications .... History One of the first recorded discoveries regarding electromagnetic propulsion was in 1889 when Professor Elihu Thomson made public his work with electromagnetic waves and alternating ... these principles and introduced the first practical application of electromagnetic propulsion. ref ... km h. Guinness World Records authorization. Electromagnetic propulsion is utilized in transportation ... katesix There is an air gap between these two parts that creates the frictionless property an electromagnetic ... of a linear induction motor begins with an AC force that is supplied to the coil windings ... fields in the primary coil assembly and reaction plate alternate, which generates force and direct ... interactions of the vehicle s own electromagnetic field and the magnetic field of the earth. The thrust force may be thought of as an electrodynamic force of interaction of the electric current ... a greater force of interaction, the magnetic field must be propagated further from the flight craft. The advantages of such systems is the very precise and instantaneous control over the thrust force ... more details
File Onde electromagnetique.svg thumb 400px Electromagnetic waves can be imagined as a self propagating ... other. Electromagnetism cTopic Classical electromagnetism Electrodynamics Electromagnetic radiation ... . In vacuum , electromagnetic radiation propagates at a characteristic speed, the speed of light . Electromagnetic radiation is a particular form of the more general electromagnetic field EM field that is defined as the field produced by moving charges. Electromagnetic radiation is associated with only ... when it is destroyed. The photon is the quantum of the electromagnetic interaction, and is the basic ... accelerated by force s acting on them. Electron s are responsible for emission of most EMR because ... electrons are most sharply accelerated when they encounter a region of force, so they are responsible for producing much of the highest frequency electromagnetic radiation observed in nature. Quantum ... of its wave. The electromagnetic spectrum , in order of increasing frequency and decreasing wavelength ... thumb Shows the relative wavelengths of the electromagnetic waves of three different colors ... Clerk Maxwell first formally postulated electromagnetic waves . These were subsequently confirmed by Heinrich Hertz . Maxwell derived a Electromagnetic wave equation wave form of the electric and magnetic ... varying magnetic field causes changes over time in the electric field. In an electromagnetic wave ... form a propagating electromagnetic wave, which moves out into space and never again affects the source ... charges and currents sources in Maxwell s equations that produce a local type of electromagnetic ... for EM radiation. Instead, they cause electromagnetic field behavior that only efficiently transfers power to a receiver very close to the source, such as the electromagnetic induction magnetic induction ..., whether the signal is immediately picked up, or not. This distant part of the electromagnetic field is electromagnetic radiation also called the far field . The far fields propagate without ability ... 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 using a feedback loop . In most cases the levitation effect is mostly due to the permanent magnets since they don t have any power dissipation, with electromagnets only used to stabilize the effect. A charged body cannot rest in stable equilibrium when placed in a pure electrostatic field or magnetostatic field. In these kinds of fields an unstable equilibrium condition exists. Although static fields cannot give stability, EMS works by continually altering the current sent to electromagnets to change the strength of the magnetic field and allows a stable levitation to occur. In EMS a feedback loop which continuously adjusts one or more electromagnets to correct the object s motion is used to cancel the instability. Many systems use magnetic attraction pulling upwards against gravity for these kinds of systems as this gives some ... Sciences, University of Sussex. Electromagnetic Suspension and Levitation. ref Likewise, due to limitations ... extension and stabilized magnetic force by controlling current intensity and turning ... service was opened in Birmingham, England in 1984, using electromagnetic suspension, and a linear ... 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 the levitation ... is suspended on a guiding rail by the principle of electromagnetic suspension. Maglev has the advantages ... axis main Active magnetic bearing An active magnetic bearing AMB works on the principle of electromagnetic ... a microprocessor or Digital signal processor DSP . Electromagnetic Suspension Device for wheeled transports ... magnets or conductors References references External links BOSE Electromagnetic Suspension http www.bose.com ... DEFAULTSORT Electromagnetic Suspension Category Electromagnetism Category Levitation Category ... more details
Image Electromagnetic oscillograph img 1647.jpg thumb An electromagnetic oscillograph is an oscillograph which measures variations of electric current by having it go through a magnetic coil. Variations in current induce momentum in the coil, which can be directly measured. The electromagnetic oscillograph was invented by William Duddell . Some models utilise a mirror which reflects a beam of light, allowing measurement of minute movements of the coil. Other were fitted with a hand, possibly fitted with a pen to record values. External links http chem.ch.huji.ac.il history duddell.html William du Bois Duddell http www.freepatentsonline.com 2466691.html Electromagnetic oscillograph Category Measuring instruments Category British inventions ... more details
An Electromagnetism electromagnetic cavity is a cavity that acts as a container for electromagnetic field 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
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 electromagnetic field, 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 electromagnetic field . 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. Advantages No moving parts Disadvantages Salinity and temperature of water affects calibration Measurements affected by boundary layer, water speed slowed down close to the hull by friction External links http thenauticalsite.com NauticalNotes EchoSpdLog MyEchoSpdLog Lesson02 SpeedLogs.htm http www.yokogawa.com ydk mr marine emlog index.htm http www.agiltd.co.uk marine instrumentation agilog speed log Category Navigational equipment electronics stub nl Elektromagnetisch log ... more details
Idiopathic environmental intolerance attributed to electromagnetic fields IEI EMF is a set of claims of adverse medical symptoms purportedly caused by exposure to electromagnetic field s. ref name who Other terms for IEI EMF include electromagnetic hypersensitivity EHS , electrohypersensitivity , electro sensitivity , and electrical sensitivity ES . 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 ... have found that self described sufferers of electromagnetic hypersensitivity are unable to distinguish between exposure to real and fake electromagnetic fields, ref name RubinProvReview2005 ref name ... on electromagnetic hypersensitivity. ref http www.who.int peh emf publications reports EHS Proceedings ... to find any causal connection between electromagnetic field exposure and ill health. ref ..., M Meier, C Braun Fahrlander title Symptoms of ill health ascribed to electromagnetic field exposure ... . ref name irvine2005 Levitt proposed ties between electromagnetic fields and some of these 20th century ... Levitt first B. Blake authorlink coauthors title Electromagnetic Fields publisher Harcourt Brace ... or smells. A 1991 study by William J. Rea concluded that there is strong evidence that electromagnetic ... Yaqin Pan, Ervin Yenyves, Iehiko Sujisawa, Hideo Suyama, Nasrola Samadi, Gerald Ross title Electromagnetic ... electromagnetic hypersensitivity will usually describe different levels of susceptibility to electric field s, magnetic field s and various frequencies of electromagnetic waves including fluorescent ... Philips, Alasdair and Jean 2003 2011 . http www.emfields.org library.asp Electromagnetic hypersensitivity EHS in 8 sections ref Other surveys of electromagnetic hypersensitivity sufferers have not been ... have been attributed to electromagnetic field exposure. A minority of people who report electromagnetic ... more details
Infobox Company name Electromagnetic Geoservices ASA logo type Public company Public ose EMGS genre foundation founder location city Trondheim location country Norway location locations area served Global key people Roar Bekker small Chief Executive Officer CEO small industry Petroleum industry Petroleum products services marine EM technology revenue operating income net income owner num employees parent divisions subsid slogan homepage http www.emgs.com emgs.com footnotes intl yes http www.emgs.com Electromagnetic Geoservices ASA ose EMGS or http www.emgs.com EMGS is a Norway Norwegian geophysics geophysical services company using proprietary marine electromagnetic EM technology to support oil and gas companies in their search for offshore hydrocarbons. EMGS pioneered marine EM technology an emerging and environmentally benign exploration method in 2002 with the first successful application and commercialization of controlled source electro magnetic surveying technology CSEM . Marine EM, or CSEM, is an emerging exploration method that uses electromagnetic energy to detect resistive bodies including hydrocarbon reservoirs beneath the seabed. The company has conducted over 600 surveys to reduce exploration risk and improve drilling success rates across the world s mature and frontier basins. The technology is used in water depths ranging from 48 to 3392 metres . EMGS technology is changing how oil and gas operators are searching for hydrocarbons in frontier and mature offshore basins. The company acquires 3D EM and marine magnetotelluric data, which are used to assess formation resistivity before drilling, and interpret and integrate this information with other geo data to aid exploration decision making. 3D EM data is routinely used for lead generation, prospect ranking and volume assessments. Main offices and research department are located in Trondheim, Norway . The company ... Category Engineering companies of Norway Category Companies based in Trondheim de Electromagnetic ... more details
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