Electromagnetic induced currents

W. R. Effects of therapeutic electromagnetically induced current on hormone responsiveness of bone cells in vitro. American Electrochemical Society, 157th Meeting, St. Louis, Missouri, May 1980. J. Electrpchem. Soc. 1980, 127, 129c (abstract). 

A major problem with the chronic implantation of electrodes, especially for control of cellular function, is the likelihood that the electrode will poison or cause trauma to the tissue[16]. When large currents are passed through implanted electrodes, the dissolution of ions and the generation of gases can cause lesions. However, the use of transcutaneous stimulation avoids this problem. For example, an area that has received particular attention is the use of electromagnetically induced currents. 

NMR. On the other hand what do you think of the Pilla currents, i.e. the electromagnetic induced currents pulsed by Helmholtz coils, which can also stimulate nerve dendrite growth In the future they might be in competition with your methods. 

At sufficiently high frequency, the electromagnetic skin depth is several times smaller than a typical defect and induced currents flow in a thin skin at the conductor surface and the crack faces. It is profitable to develop a theoretical model dedicated to this regime. Making certain assumptions, a boundary value problem can be defined and solved relatively simply leading to rapid numerical calculation of eddy-current probe impedance changes due to a variety of surface cracks. 

The electrodynamic and electromagnetic forces between the conductors and the structures are also reduced to only 10-15% or even less. These two advantages are not available to this extent in a non-continuous enclosure. The induced current causing the magnetic field in the space is now reduced to only,... 

Alternating-current motors are classified as induction motors or synchronous motors. Faraday found that a stationaiy wire in a magnetic field produced no current. However, when the wire continues to move across magnetic lines of force, it produces a continual current. When the motion stops, so does the current. Thus Faraday proved that electric current is only produced from relative motion between the wire and magnetic field. It is called an induced current—an electromagnetic induction effect. 

Heinrich Lenz studied the direction of the current that is induced in a conductor as a result of changing the magnetic field near it. You can think of this as the change in a system in electromagnetic equilibrium. Lenz published his law in 1834. It states that when a conductor interacts with a magnetic field, there must be an induced current that opposes the interaction, because of the law of conservation of energy. Lenz s law is used to explain the direction of the induced current in generators, transformers, inductors, and many other systems. 

Bawin, S. M. Lin-Liu, S. Adey, W. R. Influence of weak electromagnetically induced pulsating current on Ca binding in isolated cerebral tissue. American Electrochemical Society,... 

This method is based on the principles of electromagnetic induction. A coil carrying an alternating current in the vicinity of the test sample produces an induced or eddy current in the sample, and the changes in the magnetic field due to the induced currents are monitored. The induced currents in the test sample are affected by electrical conductivity, permeability, the dimensions and the homogeneity of the sample. 

The intensity of the selected radiation is measured by devices in which the radiation either interacts with the materials in the detector (e.g., electron release, thermal heating) or generates induced currents due to the electromagnetic field of the radiation. 

Induced currents, concentrated on the surface of a conductor or near the primary sources, decay with time as the electromagnetic energy is converted into heat and ap>-pears at various points in the medium. It is obvious that the decay of the field takes place more rapidly in a highly resistance medium, while it decreases slowly in a conductive medium. 

It is clear that if the current changes in the primary source with relatively high frequency, the induced currents essentially remain either on the surface of the conductor or close to the source depending on whether the source is located outside or within the conductor. This explains why the high-frequency asymptote coincides with that of the early stage in transient electromagnetic fields. 

Calculation of the Electromagnetic Field Caused by Induced Currents in One Shell... 

In accord with the electromagnetic induction law at the first moment the field is absent in a conducting medium. Such behavior takes place due to the fact that induced currents arise near the source, which compensate the primary field of the dijiole current. 

The interaction bet veen electromagnetic vaves and matter is quantified by the two complex physical quantities - the dielectric permittivity, s, and the magnetic susceptibility, fi. The electric components of electromagnetic waves can induce currents of free charges (electric conduction that can be of electronic or ionic origin). 

A prominent example of the application of electrochemistry in medicine is as a technique to stimulate bone growth. There is some controversy over the type of stimulation that is optimal for growth, i.e., direct application of current via implanted electrodes or induced currents via pulsating electromagnetic or electrostatic fields. Both approaches have been successfully applied. 

Induced currents, using electromagnetic or electrostatic fields, bypass the problem of having to implant electrodes and eliminate necrosis of tissue by anodic currents. However, inducing currents in tissue requires the use of pulsating fields. 

According to the fact that the underground induced current is distributed like rings and the smoke ring effect theory of electromagnetic field transmission, the vertical spreading speed vs and depth D of the electromagnetic field under random... 

Inductance may thus be distinguished as self- or mutual and is measured by the electromotive force produced in a conductor by unit rate of variation of the current. Units of inductance are the centimeter (absolute electromagnetic) and the Henry, which is equal to 10 cm of inductance. The Henry is that inductance in which an induced electromotive force of 1V is produced when the inducing current is changed at the rate of 1 A/s. Thus, IH = 1 V/A/s = 1 Vs/A = IWb/A. Dimensions [E L T ], [pL]. Weast RC (ed) (1971) Handbook of chemistry and physics, 52nd edn. The Chemical Rubber Co., Boca Raton, FL. 

Ever since the discovery of the voltaic pile, there had been doubt about the identity of voltaic and common (i.e. frictional) electricity. In 1831 Faraday made his classic discovery of electromagnetic induction, and thus added a third type of electricity. The first experiment Faraday performed after he had discovered the induced current was to see if it would produce any decomposition in a drop of copper sulphate solution. The quantity of electricity passed was too small to produce any... 

S D Smith and A A Pllla, Modulation of new limb regeneration by electromagnetically induced low level pulsating current. In "Mechanisms of Growth Control," R. 0 Becker, ed., Thomas Springfield, 11 137 (1981). 

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