科技改变生活主题班会-ppt

HowScienceHasChangedtheWorldWeLiveinWhatchangeshavemoderntechnologybroughttoourlife?Clothesbecomemorecolorfulandbeautiful.Cookinghasbecomemoresimpleandconvenient.ChangesinthefunctionofmobilephonesJustfortalkingCanbebothentertainmentandofficeThebirthofatelephoneThephoneisprobablythemostfrequentlyusedtoolwehavetoday，Andwecanhardlyleaveit。So,Ican'thelpwondering,howwasthetelephoneinvented?TheemergenceofmobilephonesOnedayinApril1973,amanstandingonthestreetsofNewYork,tookoutawirelessphoneabouttwobigbricksize,andMadeaphonecall,attractedtheattentionofpassers-byhavestopped.ThispersonistheinventorofthecellphoneMartinCoop.HewasintheUnitedStates,afamoustechnologycompanyMotorolaasaengineeringandtechnicalpersonnelTheconceptofmobilephonesappearedin40s.AtthattimetheUnitedStatesthelargesttelecommunicationscompany-Baerlaboratoryhasconductedresearch.In1946,theBaerlabmadethefirstmobilephoneinhumanhistory.Butbecauseitistoolarge,theresearcherscanonlyputitontheshelfinthelaboratory,andithasbeenforgottenbythepeople.1973mobilephonehasbeenregisteredpatents,butuntil1985wasborninthefirstmodernmobilephone.Itisthepowerandantennaplacedinabox,theweightof3kg,veryheavyandinconvenient,theusershouldcarryitlikeabackpacktocarryittowalk,soitiscalledtheshoulderbackphone.Moderncellphoneappearancewasbornin1987.Comparedwiththeshoulder,itismuchlighterandeasiertocarry.Nevertheless,itsweightisstillabout750grams,comparedtotoday'sweighsonly60grams’smobilephone,itlikeabigbrick.Sincethen,thedevelopmentofmobilephoneshasbecomemoreandmorerapid.1991,thephoneweighsabout250gramsorso;atthefallof1996,avolumeof100cubiccentimeters,weight100gramsofmobilephonesappeared.Sincethenfurtherminiaturization,lightweight,In1999therewasaweightof60gramsorlessofacellphone.Thatistosay,acellphoneisnotmuchmoreheavythananegg.Inadditiontothequalityandvolumeismoreandmoresmall,modernmobilephoneismorelikeamultifunctionalSwissArmyknife.Inadditiontothemostbasiccallfeature,thenewcellphonecanalsobeusedtosendandreceivemessagesandshortmessages,youcansurftheInternet,playgames,takepictures,andevenwatchmovies!Thisisthefirstmobilephoneinventorunexpected.Thanksverymuch