材料科学英语Unit 4 Lecture 4 Critical thinking.ppt

TheClassificationofMaterials

Section4CriticalThinkingUnit4

Warm-upquestions1.Thehistoryofhumancivilizationandsocialdevelopmentisstronglyintertwinedwiththepervasiveroleofmaterials.Whatarethecriteriaforselectingacertainkindofmaterialaccordingtoyourunderstanding?

Warm-upquestions2.Manymaterialsthatweusearederivedfromresourcesthatarenonrenewable,thatis,notcapableofbeingregenerated,suchassomepolymersandmetals.Thesenonrenewableresourcesaregraduallybecomingdepleted.

CriticalthinkingTextBReadthetextBandtrytothinkaboutthefollowingtwoquestions:1.Whatkindofbiomasscanbeusedtoproduceelectricity?2.Howcanbiomassbeconvertedintoelectricpower?

A1.Biomassisusedforfacilityheating,electricpowergeneration,andcombinedheatandpower.Thetermbiomassencompassesalargevarietyofmaterials,includingwoodfromvarioussources,agriculturalresidues,andanimalandhumanwaste.1.4CriticalThinking1

A2:Biomasscanbeconvertedintoelectricpowerthroughseveralmethods.Themostcommonisdirectcombustionofbiomassmaterial,suchasagriculturalwasteorwoodymaterials.Otheroptionsincludegasification,pyrolysis,andanaerobicdigestion.1.4CriticalThinking1

1.4CriticalThinking1

1.4CriticalThinking2Itisstillahotdebatedtopicastogrowbiofuelcropstoproduceethanol.Whichsidedoyoutake?

ResearchingTask--HomeworkIdentifyavailablebiomassresourcesinoneprovinceofChina.Researchsomeapplicationsofthesebiomassresources.Presentyourfindingstotheclass.