【环境课件】专业英语（环境工程）教案

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1、专业英语（环境工程）教案Unit1ThePopulationExplosion要求：1、了解人口爆炸是当今世界面临的一个重要问题，以及导致人口爆炸的原因。2、了解人口爆炸所带来的问题以及应对方法。I.Somewordsandexpressions1.populationexplosion人口爆炸2.birthratesanddeathrate出生率合死亡率3.food,clothingandshelter衣食住行4.fam订yplanning计划生育5.Morethantwo-thirdsofthepeoplei

2、ntheworldliveinthecountriesthathaveprogramsforfamilyplanning.世界三分z二以上人口的国家都实行计划生育政策。II.Questions1.Pointoutthereasonsthatcausepopulationexplosion.a.Thenumberofbirthsisgreaterthanbefore.b.Peoplecanlivelonger.2.Todayourpopulationissixbillion.Howmanyyearswillitta

3、ketoreacheightbillioniftheworldpopulationincreasedatarateofeightymillion?A.2.5yearB.25yC.250yTheanswerisB.Why?3.Howmanymeasurescanbetakentosolvetheproblemsthatarecausedbylargepopulationgatheringinbigcities?a.Lowerbirthratefamilyplanb.Improvefoodsupplyc.Limitt

4、hesizeofcitiesandencouragepeopletoliveinsmalltownsandinthecountryside.Unit2EffectsofNoise教学要求：1、了解噪声的特点及來源。2、了解噪声的危害和控制技术。教学内容：1>puretone纯咅(频率单一)2、sound-pressurelevel声压级，声压的分贝标度叫做声压级(LP)U=2Olg(P/Po),P—待测声压Po—基准声压，人耳能察觉的最低声压3、octavebands1倍频程log2(f2/fi)=l□f2>f】

5、一噪声监测终所用滤波器(等比带宽滤波器)的上下截止频率。1倍频程简称倍频程，在咅乐上称为一个八度。4^Whatissound?Thatwhichweheariscalledsound.5、Thecharactcristicsofsoundarc:speed,pitch(detcrminedbyfrequency),energy,wave1engthandsoundpower.6、Noise:undesirablesoundThedefinitionofnoiseisvariable.7、Theinstrument

6、thatmeasuressoundisdecibelmeter,andascaleofsuchiscalledadecibel(dB).(1)ZerodBrepresentsthesoftestsoundthatisaudibletothehumancar.(2)dB二10Xlg(T/I0),ToisthefaintestaudiblesoundandIistherealsoundwemeasured.8、Intensity:声强(I),每秒钟通过与声波传播方向垂直的面积上的平均声能。9、Soundpressur

7、e:声压(P),声源震动时，它所辐射出的能量会引起空气介质的压力变化。10、Noisecontrolcanbedoneinreducingnoiscsource,intorruptingthepathoftransmission,orprotectingthereceiver.(1)Sourcereducing:a.Modifytechnologicalapproachessoastoaccomplishgivenobjectivesmorequietly.b.Usingthemachinesthatworkqu

8、ietly.(2)Transmissionpathinterruptinga.Choosingmaterialsthatvibrateveryinefficientlytoconvertthesoundenergyintoheat,(thatis,usingacousticalmaterials)b.Usingmufflersc-deflcctingthesoundpat