Electrical apparatus used for protecting electrical circuits

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from wikipedia, the free encyclopedia jump to navigation jump to search american physicist and engineer john bardeen born ( - - )may , madison, wisconsin , u.s. died january , ( - - ) (aged ) boston, massachusetts , u.s. education university of wisconsin ( bs , ms ) princeton university ( phd ) known for

wigner [ ] doctoral students william l. mcmillan [ ] john robert schrieffer [ ] nick holonyak [ ] john bardeen ( /bɑːrˈdiːn/ ; may , – january , ) [ ] was an american physicist . he is the only person to be awarded the nobel prize in physics twice: first in with william shockley and walter brattain for...

https://en.wikipedia.org/wiki/John_Bardeen

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bermad fire protection indicating devices the model ps- , adjustable, pre-set pressure switch is suitable for pressure and/or flow detection in bermad valve systems such as deluge or pre-action, or with other control valves and is suited for non-hazardous locations. the model ps- is also used to provide

a low pressure supervisory signal for bermad pre-action systems and pneumatically controlled deluge valves. general purpose pressure switch model ps- features nnsolid metal enclosure nn ip / nema watertight and dust proof when used with suitable cable connection nn . bar ( psi) system pressure rated...

https://www.bermad.com/wp-content/uploads/2016/06/75-general-purpose-pressure-switch-final.pdf

of signals for the purposes of telecommunication . signals are typically imposed on a wave of some kind suitable for the chosen medium. for example, data can modulate sound and a transmission medium for sounds may be air , but solids and liquids may also act as the transmission medium. vacuum or air

constitutes a good transmission medium for electromagnetic waves such as light and radio waves . while material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance by absorption or by reflection or...

https://en.wikipedia.org/wiki/Transmission_medium

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