( ( The ( internal energy ) ) ( ( is ( defined ( by ( ( specific potentials ) ( describing ( ( the ( elastic properties ) ) ( of ( the level-set ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ internal) (NN energy)) (VP (VBZ is) (VP (VBN defined) (PP (IN by) (NP (NP (JJ specific) (NNS potentials)) (VP (VBG describing) (NP (NP (DT the) (JJ elastic) (NNS properties)) (PP (IN of) (NP (DT the) (NN level-set))))))))) (. .)))
The internal energy is defined by specific potentials describing the elastic properties of the level-set.
(ROOT (S (NP (DT The) (ADJP (NN term) (JJ elastic)) (JJ potential) (NN energy)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (S (NP (JJ potential) (NN energy)) (ADJP (JJ due) (PP (TO to) (NP (NP (DT an) (NN object) (POS 's)) (NN shape)))))))))) (. .)))