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The usual nomenclature of ammunition indicates the diameter of projectile and the length of the cartridge that holds it; for example, 20×102 mm is a 20 mm projectile in a 102 mm long case. Though this designation is often assumed to be unique, this is not always the case, e.g. there are three different 20×110 mm types which are not compatible.
The Magic Slate consists of a piece of rigid cardboard the size of a small clipboard that is covered with dark waxed paper on one side, a sheet of translucent plastic film that covers the waxed paper and is affixed to the top of the board, and a blunt stylus made of wood or plastic. When writing or drawing on the plastic film with the stylus ...
The pole-to-pole distance is on the order of 5 mm, but varies with manufacturer. These magnets are lower in magnetic strength but can be very flexible, depending on the binder used. [39] For magnetic compounds (e.g. Nd 2 Fe 14 B) that are vulnerable to a grain boundary corrosion problem it gives additional protection. [38]
The plastic material became 1.5 times more magnetic when blue light was shined on it. Green laser light reversed the effect somewhat by decreasing the material's magnetism to 60 percent of its normal level. The plastic magnet was made from a polymer made of tetracyanoethylene (TCNE) combined with manganese (Mn) ions – atoms of the metal ...
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The neodymium atom can have a large magnetic dipole moment because it has 4 unpaired electrons in its electron structure [14] as opposed to (on average) 3 in iron. In a magnet it is the unpaired electrons, aligned so that their spin is in the same direction, which generate the magnetic field.
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