( ( Superconductors ( are ( materials ( that ( exhibit ( ( zero ( electrical resistance ) ) ( at ( ( ( ( ( very low ) temperatures ) , ) ( near ( to ( absolute zero ) ) ) ) ( One ( of ( ( the ( ( most important ) superconductors ) ) ( in ( practical use ) ) ) ) ) ) ) ) ) ) ) ) ) ( ( is ( ( ( a ( niobium-tin alloy ) ) , ) ( Nb ( 3 Sn ) ) ) ) . ) )
(ROOT (SINV (S (NP (NNS Superconductors)) (VP (VBP are) (NP (NP (NNS materials)) (SBAR (IN that) (S (NP (NN exhibit)) (VP (VBP zero) (NP (JJ electrical) (NN resistance)) (PP (IN at) (NP (NP (ADJP (RB very) (JJ low)) (NNS temperatures)) (, ,) (ADVP (RB near) (PP (TO to) (NP (JJ absolute) (CD zero)))) (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (ADJP (RBS most) (JJ important)) (NNS superconductors)) (PP (IN in) (NP (JJ practical) (NN use)))))))))))))) (VP (VBZ is)) (NP (NP (DT a) (JJ niobium-tin) (NN alloy)) (, ,) (NP (NNP Nb) (NNP 3) (NNP Sn))) (. .)))
Superconductors are materials that exhibit zero electrical resistance at very low temperatures, near to absolute zero One of the most important superconductors in practical use is a niobium-tin alloy, Nb 3 Sn.
(ROOT (S (NP (NNS Superconductors)) (VP (VBP are) (NP (NP (NNS materials)) (PP (IN with) (NP (NP (DT a) (NN resistivity)) (PP (IN of) (NP (CD zero))))))) (. .)))