universidade federal de pernambuco departamento de física
... discovery let them to be awarded the Nobel prize in physics of 2007. Magnetoresistance (MR) is the change of the resistance in a conductor when submitted to an ⃗ In the case of the FM’s this effect also depends on the external magnetic field H. ⃗ relative to the direction of Ie , thus, receiving the ...
... discovery let them to be awarded the Nobel prize in physics of 2007. Magnetoresistance (MR) is the change of the resistance in a conductor when submitted to an ⃗ In the case of the FM’s this effect also depends on the external magnetic field H. ⃗ relative to the direction of Ie , thus, receiving the ...
EHC 238 - World Health Organization
... should be addressed to WHO Press, at the above address (fax: +41 22 791 4806; e-mail: [email protected]). The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning ...
... should be addressed to WHO Press, at the above address (fax: +41 22 791 4806; e-mail: [email protected]). The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning ...
Electric Machinery
... Drive-systems based upon power electronics permit a great deal of flexibility in the control of electric machines. This is especially true in the case of ac machines which used to be found almost exclusively in applications where they were supplied from the fixed-frequency, fixed-voltage power syste ...
... Drive-systems based upon power electronics permit a great deal of flexibility in the control of electric machines. This is especially true in the case of ac machines which used to be found almost exclusively in applications where they were supplied from the fixed-frequency, fixed-voltage power syste ...
Coherent Control of Polarized Neutron Interferometry
... interferometer to separate two paths where spin states are independently manipulated. The final measurement is made on the spin degree of freedom, so we observe spinbased contrast without a need for coherence in the path degree of freedom. This is difficult to achieve in a spin-echo interferometer b ...
... interferometer to separate two paths where spin states are independently manipulated. The final measurement is made on the spin degree of freedom, so we observe spinbased contrast without a need for coherence in the path degree of freedom. This is difficult to achieve in a spin-echo interferometer b ...
Tunneling from a correlated two-dimensional electron system transverse to a... * T. Sharpee and M. I. Dykman P. M. Platzman
... refer to the range ⌫⬎20.2 A classical transition to a Wigner crystal 共WC兲 was observed for ⌫⬇130. 15,16 Recently much attention have attracted also strongly correlated low-density electron and hole systems in semiconductors, where there have been reached the values of ⌫⬃40 which are expected to be s ...
... refer to the range ⌫⬎20.2 A classical transition to a Wigner crystal 共WC兲 was observed for ⌫⬇130. 15,16 Recently much attention have attracted also strongly correlated low-density electron and hole systems in semiconductors, where there have been reached the values of ⌫⬃40 which are expected to be s ...
High Frequency Magnetic Core Loss Study
... analyzed. The challenge of the analysis is the complexity of the distribution of bias field and flux density in a highly biased planar inductor. Each point in the core is working at different excitation and bias condition, and the core loss density is very non-uniform. The proposed method combines t ...
... analyzed. The challenge of the analysis is the complexity of the distribution of bias field and flux density in a highly biased planar inductor. Each point in the core is working at different excitation and bias condition, and the core loss density is very non-uniform. The proposed method combines t ...
Electromagnetic Fields - Portale Agenti Fisici
... assessed in the case studies gave rise to strong fields. In some cases the risk was only to workers at particular risk who could be excluded from the strong field area. In other cases there were potential risks to all workers, but it was not necessary for them to be present in the area whilst the st ...
... assessed in the case studies gave rise to strong fields. In some cases the risk was only to workers at particular risk who could be excluded from the strong field area. In other cases there were potential risks to all workers, but it was not necessary for them to be present in the area whilst the st ...
Presentation 3 - gnssn
... Alternative to provide an acceleration on every moment. Charged particle ...
... Alternative to provide an acceleration on every moment. Charged particle ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.