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Аҧсуа бызшәа

Аҧсуа бызшәа -Аҧсны ҳəынҭқарра бызшәас иамоуп .

- Аҧсуа aлфaвит
- Аҧсуа category:Аҧсуа ja:アブハズ語

Matteuci effect

Magnetostriction is a property of ferromagnetic materials to undergo a change of their physical dimensions when subjected to a magnetic field. This effect was first identified in 1842 by James Joule when observing a sample of nickel. This property, which allow magnetostrictive materials to convert magnetic energy into kinetic energy and conversely, is used for the building of both actuation and sensing devices. It is often quantified by the magnetostrictive coefficient, L, which is the fractional change in length as the magnetization of the material increases from zero to the saturation value. The effect is responsible for the familiar "electric hum" () which can be heard near transformers and high power electrical devices (depending on country, either 100 or 120Hz, plus harmonics). The reciprocal effect, the change of the susceptibility of a material when subjected to a mechanical stress, is called the Villari effect. Two other effects are related to magnetostriction: the Matteucci effect is the creation of a helical anisotropy of the susceptibility of a magnetostrictive material when subjected to a torque and the Wiedemann effect is the twisting of these materials when an helical magnetic field is applied to them. The Villari Reversal is the change in sign of the magnetostriction of iron from positive to negative when exposed to magnetic fields of approximately 40000 A/m (500 oersteds).

External links

- [http://hyperphysics.phy-astr.gsu.edu/hbase/solids/magstrict.html Magnetostriction]
- [http://aml.seas.ucla.edu/research/areas/magnetostrictive/mag-composites/Magnetostriction%20and%20Magnetostrictive%20Materials.htm Magnetostriction(2)]
- [http://www.newscientist.com/backpage.ns;jsessionid=JOKHIOKENCLO?id=mg18124336.300 Electricity is supposed to be the "silent servant". So why do transformers hum?] Category:Electric and magnetic fields in matter

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Odkazy

- [http://interkom.scifi.c

Biografie

William King, též Bill King se narodil ve Stranraeru (Skotsko) v roce 1959. Jeho povídky se objevily v sbornících The Year's Best SF, Zenith a časopisech White Dwarf a Interzone. Je autorem cyklu o Gotrekovi a Felixovi ze světa Warhammeru a autorem série Space Wolf ze světa Warhammer 40000. Intenzivně cestuje po