( ( In ( ( ( ( the case ) ( of ( steam turbines ) ) ) , ) ( such ( as ( would ( be ( used ( ( ( for ( marine applications ) ) or ) ( for ( land-based ( electricity generation ) ) ) ) ) ) ) ) ) ) ) ( , ( ( a ( Parsons ( type ( reaction turbine ) ) ) ) ( ( would ( ( ( ( require ( ( ( approximately double ) ( the number ) ) ( of ( blade rows ) ) ) ) ( as ( a ( de ( Laval ( type ( impulse turbine ) ) ) ) ) ) ) , ) ( for ( ( the ( same degree ) ) ( of ( thermal ( energy conversion ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NN case)) (PP (IN of) (NP (NN steam) (NNS turbines))) (, ,) (PP (JJ such) (IN as) (SQ (MD would) (VP (VB be) (VP (VBN used) (PP (PP (IN for) (NP (JJ marine) (NNS applications))) (CC or) (PP (IN for) (NP (JJ land-based) (NN electricity) (NN generation)))))))))) (, ,) (NP (DT a) (NNP Parsons) (NN type) (NN reaction) (NN turbine)) (VP (MD would) (VP (VB require) (NP (NP (QP (RB approximately) (JJ double)) (DT the) (NN number)) (PP (IN of) (NP (JJ blade) (NNS rows)))) (PP (IN as) (NP (DT a) (NNP de) (NNP Laval) (NN type) (NN impulse) (NN turbine))) (, ,) (PP (IN for) (NP (NP (DT the) (JJ same) (NN degree)) (PP (IN of) (NP (JJ thermal) (NN energy) (NN conversion))))))) (. .)))
In the case of steam turbines, such as would be used for marine applications or for land-based electricity generation, a Parsons type reaction turbine would require approximately double the number of blade rows as a de Laval type impulse turbine, for the same degree of thermal energy conversion.
(ROOT (S (NP (NP (DT A) (NN turbine)) (VP (VBG using) (NP (NP (NNS tides)) (PP (IN in) (NP (DT the) (NN ocean)))))) (VP (MD can) (VP (VB create) (NP (NN electricity) (NN energy)))) (. .)))