Maintenance Strategy Essay

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B't'h re''t'r' 're 'n im''rt'nt f'rm 'f 'r'du'ti'n in m'dern 'hemi''l indu'trie' f'r re'lizing frequently 'h'nging 'r'du'ti'n 'l'nt' th't require 'r'du't' 'f m'ny kind', in v'ri'ble qu'ntitie'. In ''m''ri''n t' ''ntinu'u' re''t'r', b't'h re''t'r' 'ffer flexible 'nd e''n'mi''lly 'ttr''tive ''ti'n' be''u'e the ''me equi'ment ''n be u'ed f'r different 'r'du't' de'ending 'n m'rket dem'nd.


M'ny 'f the'e b't'h re''t'r' 're 'emib't'h ('l'' ''lled fedb't'h) re''t'r' in whi'h 'n initi'l 'm'unt 'f m'teri'l i' 'l''ed in the re''t'r, the liquid i' he'ted t' the de'ired tem'er'ture, 'nd then 'dditi'n'l feed 'f fre'h re''t'nt i' gr'du'lly 'dded t' the ve''el. ''tim'l ''ntr'l the'ry h'' been widely u'ed t' derive ''er'ti'n ''li'ie' f'r b't'h re''t'r' (Fili''i-B'''y et 'l., 1989). M'ny '''er' h've been 'ubli'hed where different ''tim'l ''ntr'l de'ign' 're ex'l'red, r'nging fr'm re'urrent neur'l netw'rk m'del' (Xi'ng 'nd Zh'ng, 2005) t' 'n-line dyn'mi' ''timiz'ti'n ('r''rnwi'h'n'' et 'l., 2005). The intere'ted re'der i' referred t' the re'ent 'urvey by 'met' et 'l., 2004 I.Y. 'met', J.E. 'l'e', E.J. N'vember, G.'. B''tin 'nd J.F. V'n Im'e, ''tim'l 'd''tive ''ntr'l 'f (bi')'hemi''l re''t'r': '''t, 're'ent 'nd future, J'urn'l 'f 'r''e'' ''ntr'l 14 (2004), ''. 795-805. The f'll'wing n't'ti'n will be ''n'idered in the next 'e'ti'n':
In the 'equel, the "b't'h re''t'r" termin'l'gy will refer t' b'th 'tri't b't'h 'nd 'emib't'h re''t'r'. B't'h re''t'r' in whi'h m re''ti'n' t'ke 'l''e inv'lving n (n>m) 'hemi''l ''e'ie', 're ''n'idered. M''' 'nd energy b'l'n'e' 'n the 'hemi''l re''ti'n 'y'tem le'd t' the f'll'wing 'et 'f differenti'l equ'ti'n':
Th't i', ''ntr'ry t' ''ntinu'u' 'hemi''l re''t'r' where F( ...
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