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эффект Джозефсона

English translation: the Josephson Effect

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Russian term or phrase:эффект Джозефсона
English translation:the Josephson Effect
Entered by: Vidmantas Stilius
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00:49 Jul 27, 2001
Russian to English translations [PRO]
Science
Russian term or phrase: эффект Джозефсона
протекание сверхпроводящего тока через тонкий (около 10 А) слой диэлектрика, разделяющий два сверхпроводника.
Malibu
the Josephson Effect
Explanation:
Electromagnetic Metrology

DC&LF: Resistance & Voltage Measurements
Josephson Effect
If a thin insulating barrier between two superconductors (a Josephson junction) is cooled in liquid helium to 4.2 K and exposed to electromagnetic radiation of frequency, f, then the DC voltage across the junction VJ assumes discrete values given by VJ = nfKJ where n is an integer which identifies a constant voltage step in a current-voltage characteristic and KJ is the Josephson constant. The Josephson constant is believed to be equal to the ratio h/2e where h is Planck’s constant and e is the electronic charge. In January 1990 a value of 483597.9 GHz/V was adopted for the Josephson constant in SI units with a relative 1s uncertainty of ± 0.4 ppm.

Voltage standards based on arrays of Josephson junctions have become increasingly widespread in recent years. These arrays, which consist of several thousand individual junctions, can now be used to measure voltage standards directly at the 1 V and 10 V level.


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Vidmantas Stilius
Local time: 13:42
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nathe Josephson Effect
Vidmantas Stilius


  

Answers


16 mins
the Josephson Effect


Explanation:
Electromagnetic Metrology

DC&LF: Resistance & Voltage Measurements
Josephson Effect
If a thin insulating barrier between two superconductors (a Josephson junction) is cooled in liquid helium to 4.2 K and exposed to electromagnetic radiation of frequency, f, then the DC voltage across the junction VJ assumes discrete values given by VJ = nfKJ where n is an integer which identifies a constant voltage step in a current-voltage characteristic and KJ is the Josephson constant. The Josephson constant is believed to be equal to the ratio h/2e where h is Planck’s constant and e is the electronic charge. In January 1990 a value of 483597.9 GHz/V was adopted for the Josephson constant in SI units with a relative 1s uncertainty of ± 0.4 ppm.

Voltage standards based on arrays of Josephson junctions have become increasingly widespread in recent years. These arrays, which consist of several thousand individual junctions, can now be used to measure voltage standards directly at the 1 V and 10 V level.





    Reference: http://www.npl.co.uk/npl/cem/dclf/voltres/josephson_effect.h...
Vidmantas Stilius
Local time: 13:42
Native speaker of: Native in LithuanianLithuanian
PRO pts in pair: 118
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