MRI
... A simplified Fourier transform imaging sequence includes a 90o slice selective pulse, a slice selection gradient pulse, a phase encoding gradient pulse, a frequency encoding gradient pulse, and a signal. The magnitude and duration of the magnetic field gradients are represented by the pulses. A typi ...
... A simplified Fourier transform imaging sequence includes a 90o slice selective pulse, a slice selection gradient pulse, a phase encoding gradient pulse, a frequency encoding gradient pulse, and a signal. The magnitude and duration of the magnetic field gradients are represented by the pulses. A typi ...
2: Sources and Nature of Fields and Exposure
... near appliances (particularly those with small motors or transformers such as hairdryers and fluorescent light fixtures). Because appliance fields fall off rapidly with distance and since people generally spend only brief amounts of time very close to appliances (with the exception of electric blank ...
... near appliances (particularly those with small motors or transformers such as hairdryers and fluorescent light fixtures). Because appliance fields fall off rapidly with distance and since people generally spend only brief amounts of time very close to appliances (with the exception of electric blank ...
Magnetic Reconnection - Harvard
... and oppositely directed magnetic fields in the upper and lower part of the inflow region (figure 1). The magnetic field vanishes at the origin (neutral point); viewed threedimensionally a neutral line (line on which B = 0) extends along the z-axis. ...
... and oppositely directed magnetic fields in the upper and lower part of the inflow region (figure 1). The magnetic field vanishes at the origin (neutral point); viewed threedimensionally a neutral line (line on which B = 0) extends along the z-axis. ...
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... A geomagnetic storm -- from the perspective of the upper atmosphere -- is a period of intense energy input from the Magnetosphere for a period of several hours to days. The manifestations of a storm are well-defined and include the following effects. Auroral electron precipitation increase in magnit ...
... A geomagnetic storm -- from the perspective of the upper atmosphere -- is a period of intense energy input from the Magnetosphere for a period of several hours to days. The manifestations of a storm are well-defined and include the following effects. Auroral electron precipitation increase in magnit ...
Magnetic Field Line Reconnection Experiments, 1. Field Topologies
... plete data base, erroneousinterpretationsof the plasma dynamics are easily possible.Becausethere is such a wealth of data, we wish to break up the subjectinto four parts.This first paper dealswith the magneticfield topology.It will also provide a detaileddescriptionof the experimentalsetupand meamum ...
... plete data base, erroneousinterpretationsof the plasma dynamics are easily possible.Becausethere is such a wealth of data, we wish to break up the subjectinto four parts.This first paper dealswith the magneticfield topology.It will also provide a detaileddescriptionof the experimentalsetupand meamum ...
Realization of one-way electromagnetic modes at the interface between two
... one-way wave propagation is xB2 < x < xB1 . In this regime, 1d ðxÞ > 0 and 2d ðxÞ < 0. Thus, roughly speaking, metal 1 behaves like an (anisotropic) insulator while metal 2 behaves like a metal. The surface plasmon in this regime is thus propagating at the interface between a metal and a nonmetal. ...
... one-way wave propagation is xB2 < x < xB1 . In this regime, 1d ðxÞ > 0 and 2d ðxÞ < 0. Thus, roughly speaking, metal 1 behaves like an (anisotropic) insulator while metal 2 behaves like a metal. The surface plasmon in this regime is thus propagating at the interface between a metal and a nonmetal. ...
AP Physics C - Peters Township School District
... AP Physics C: Mechanics and AP Physics C: Electricity and Magnetism together represent a rigorous, year-long second year course of study in physics designed primarily for seniors in high school. Students are expected to have completed either AP Physics I (A/B grade) or Academic Physics (A grade) bef ...
... AP Physics C: Mechanics and AP Physics C: Electricity and Magnetism together represent a rigorous, year-long second year course of study in physics designed primarily for seniors in high school. Students are expected to have completed either AP Physics I (A/B grade) or Academic Physics (A grade) bef ...
Lecture notes 100805
... The colour are also interesting in the way that there are a lot of theories for it, some close to physics some close to art. In our case we think about Göthe and his scientific ideas in which he has a colour theory. He talks about blackness and lightness as fundamental components. Conflict between t ...
... The colour are also interesting in the way that there are a lot of theories for it, some close to physics some close to art. In our case we think about Göthe and his scientific ideas in which he has a colour theory. He talks about blackness and lightness as fundamental components. Conflict between t ...
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.