( ( ( The intensity ) ( of ( ( the ( light emmisions ) ) ( -LRB- ( luminescence -RRB- ) ) ) ) ) ( ( can ( be ( measured ( to ( determine ( ( the amount ) ( of ( ( ( time ( that ( has ( passed ( since ( ( the vessel ) ( ( was last ) heated ) ) ) ) ) ) ) and ) ( ( the ( present ( laboratory heating ) ) ) ( of ( the vessel ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN intensity)) (PP (IN of) (NP (NP (DT the) (JJ light) (NNS emmisions)) (PRN (-LRB- -LRB-) (NP (NN luminescence)) (-RRB- -RRB-))))) (VP (MD can) (VP (VB be) (VP (VBN measured) (S (VP (TO to) (VP (VB determine) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NP (NN time)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (VP (VBN passed) (SBAR (IN since) (S (NP (DT the) (NN vessel)) (VP (VBD was) (ADVP (RB last)) (ADJP (JJ heated)))))))))) (CC and) (NP (NP (DT the) (JJ present) (NN laboratory) (NN heating)) (PP (IN of) (NP (DT the) (NN vessel))))))))))))) (. .)))
The intensity of the light emmisions (luminescence) can be measured to determine the amount of time that has passed since the vessel was last heated and the present laboratory heating of the vessel.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (NN heat)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))