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     ժҪ̫ܵزҵ죬ʵҵĸЧعҲڲҵĿǰָЧ̫ܵصо״


벻Դرִ벻ԴĻʯԴԻȾµ̬ƻЧӦصв棬һʯԴݽߺľ̫ΪĿԴʵԴҵĿչҪ塣


̫ܵصܶ࣬òϵIJͬɷΪ̫ܵءԪﱡĤ̫ܵءۺε缫̫ܵء׾̫ܵصȡ͵ķչ̫ܵؾ˵һ̫ܵأڶĤ̫أЧ̫صоĿǰгϴǵͶྦྷ̫ءŲҵ죬ʵҵĸЧҲڲҵ


1Ⱦ̫ܵ


ȾҲܵ(DSC)һл޻ӻ̫ܵأ̫£ȾϾнϸߵĦϵͽϿչռ̫ܣͬʱڹ⼤̬ȾϿЧĽеɷ룬뵼屡ĤȾϼ̬ĵӴ·


ʮķչȾ̫ܵصʵתЧ7.1%ߵ11%ϡDSCṩԽϸߵĹѹ͹ΪõװƽṩĿǰDSCĽṹʽĽṹΪձ(ͼ1-1)ɵ塢׽װ뵼塢ȾϡʺͶԵ缫



DSCŻҪɴӵʡȾϡԵ缫Լդ缫о


DSCԭԵҹ㷺ռ򵥣٣ҲҪ豸ɱΪ̫ص1/5-1/10кܺõķչǰ


2̲դ


̲դɰĴʿѧStuartR.Wenham1988Ƴɹġ̲դصصDzü̲ۣȻɢؿ̲ʹ֮γѡԷ伫Ȼڲûѧƺ͵ƵķƱǰ缫


̲դصŵڣ1ùƱǰ缫԰ǰ缫դúϸӶӰ赲;2ѡԷ伫ĽӴ˽Ӵ裬ߵص;3ơѧơƱ缫Իܵĵ缫ϣӶС˵缫ĵʡǴӲҵĽǶ̲դػһЩҪƱ缫ʱϳȶԲãҪƶ⿪豸߲ҵЧʵȡ


̲դصĸؽģĿǰ̲դҪм򻯿̲դءϽṹ̲դء˫̲դء


(1ΪϽṹ̲դأ2Ϊ˫̲դأ3Ϊ򻯿̲դ)



1



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3


3伫׵(EWT)


EWTһֱӴءEWTǰɢPNλڵص棬ӵռЧʡ


õȫȥդߵ缫缫еСռӣЧܹ˹ܶȣӶõϸߵЧʡEWTصڵر棬ܸõļ򻯹İװҿʵִӵصǰͱṲͬռɣкܸߵĵռʡңĹƬΪ˵ɵĴ·˿׵裬ҲߵصӡˣƷʵıƬEWT̫ؽṹԽԡ


EWT̫صĽṹͼ1ʾ



EWT̫رṹ˵صĿ·ѹӲߣߵصĿ·ѹһEWT̫оص㡣⣬EWT̫ص칤볣̫ȣDZȽϸӣڼ׻򼤹̲ۺƬҲ飬պͷװиŶҪ󣬶ұPNդ߶Ƚ׶·ҪպդƣʹEWT̫򵥻ҵչ


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