From today's featured article

From today's featured article
Silent Hill 4: The Room is a survival horror video game, the fourth installment in the Silent Hill series developed by Konami Computer Entertainment Tokyo. It was published by Konami and translated by Jeremy Blaustein. The game and its soundtrack were released in Japan in June 2004, and in North America and Europe the following September, for the PlayStation 2, Xbox and Microsoft Windows. In 2012, it was released on the Japanese PlayStation Network. Unlike the previous installments, which were set primarily in the town of Silent Hill, this game is set in the fictional town of South Ashfield, and follows Henry Townshend as he attempts to escape from his locked-down apartment. During the course of the game, Henry explores a series of supernatural worlds and finds himself in conflict with an undead serial killer. The fourth installment in the series features an altered gameplay style with third-person navigation and plot elements taken from previous installments. Upon its release, the game received generally positive critical reaction, with mixed reaction to its deviations from the rest of the series. (Full article...)

Explanation of permeability.

In electromagnetism, the auxiliary magnetic field
H represents how a magnetic field B influences
the organization of magnetic dipoles in a given
medium, including dipole migration and
magnetic dipole reorientation. Its relation to
permeability is
where the permeability, μ, is a scalar if the
medium is isotropic or a second rank tensor for
an anisotropic medium.
In general, permeability is not a constant, as it
can vary with the position in the medium, the
frequency of the field applied, humidity ,
temperature, and other parameters. In a
nonlinear medium , the permeability can depend
on the strength of the magnetic field.
Permeability as a function of frequency can take
on real or complex values. In ferromagnetic
materials, the relationship between B and H
exhibits both non-linearity and hysteresis : B is
not a single-valued function of H , [2] but
depends also on the history of the material. For
these materials it is sometimes useful to
consider the incremental permeability defined as
This definition is useful in local linearizations of
non-linear material behavior, for example in a
Newton–Raphson iterative solution scheme that
computes the changing saturation of a magnetic
circuit.

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Gyromagnetism.

Gyromagnetism
For gyromagnetic media (see Faraday rotation)
the magnetic permeability response to an
alternating electromagnetic field in the
microwave frequency domain is treated as a
non-diagonal tensor expressed by: [5]
Values for some common
materials
The following table should be used with caution
as the permeability of ferromagnetic materials
varies greatly with field strength. For example
4% Si steel has an initial relative permeability
(at or near 0T) of 2,000 and a maximum of
35,000 [6] and, indeed, the relative permeability
of any material at a sufficiently high field
strength trends toward 1.
Magnetic susceptibility and permeability data for
selected materials

permegnets.

Paramagnetism is a form of magnetism which
occurs only in the presence of an externally
applied magnetic field. Paramagnetic materials
are attracted to magnetic fields, hence have a
relative magnetic permeability greater than one
(or, equivalently, a positive magnetic
susceptibility). The magnetic moment induced
by the applied field is linear in the field strength
and rather weak . It typically requires a sensitive
analytical balance to detect the effect. Unlike
ferromagnets, paramagnets do not retain any
magnetization in the absence of an externally
applied magnetic field, because thermal motion
causes the spins to become randomly oriented
without it. Thus the total magnetization will drop
to zero when the applied field is removed. Even
in the presence of the field there is only a small
induced magnetization because only a small
fraction of the spins will be oriented by the
field. This fraction is proportional to the field
strength and this explains the linear
dependency. The attraction experienced by
ferromagnets is non-linear and much stronger,
so that it is easily observed, for instance, in
magnets on one's refrigerator.