职称英语理工类C考前冲刺训练2017职称英语理工类C考前冲刺训练宝剑不磨要生锈;人不学习要落后。以下是小编为大家搜索整理的2017职称英语理工类C考前冲刺训练，希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!BetterSolarEnergySystems:MoreHeat,MoreLightSolarphotovoltaicthermalenergysystems,orPVTs,generatebothheatandelectricity,but__1__nowtheyhaven’tbeenverygoodattheheat-generatingpartcomparedtoastand-alonesolarthermalcollector.That’sbecausetheyoperateatlowtemperaturestocoolcrystallinesiliconsolarcells,whichletsthesilicongeneratemore__2__butisn’taveryefficientwaytogatherheat.That’saproblemof__3_.Goodsolarhot-watersystemscanharvestmuchmoreenergythanasolar-electricsystematasubstantiallylower__4__.Andit，salsoaspaceproblem：photovoltaiccellscantakeupallthespaceontheroof,leavinglittleroomforthermalapplications.Inapairofstudies,JoshuaPearce,anassociateprofessorofmaterialsscienceandengineering,hasdeviseda__5__intheformofabetterPVTmadewithadifferentkindofsilicon.HisresearchcollaboratorsareKunalGirotrafromThinSiliconinCaliforniaandMichaelPathakandStephenHarrisonfromQueen’sUniversity,Canada."Mostsolarpanelsaremadewithcrystallinesilicon，butyoucanalsomakesolarcellsoutofamorphoussilicon,__6__knownasthin-filmsilicon.Theydon’tcreateasmuchelectricity,buttheyarelighter,flexible,andcheaper.And,becausethey__7__muchlesssilicon,theyhaveagreenerfootprint.Unfortunately，thin-filmsiliconsolarcellsare__8__tosomebad-newsphysicsintheformoftheStaebler-Wronskieffect.“Thatmeansthattheirefficiency__9__whenyouexposethemtolight—prettymuchtheworstpossibleeffectforasolarcell,”Pearceexplains，whichisoneofthe__10__thin-filmsolarpanelsmakeuponlyasmallfractionofthemarket.However,PearceandhisteamfoundawaytoengineeraroundtheStaebler-Wronskieffectbyincorporatingthin-filmsiliconinanew__11__ofPVT.Youdon’thavetocooldownthin-filmsilicontomakeitwork.Infact，Pearce’sgroupdiscoveredthatbyheatingittosolar-thermaloperatingtemperatures，neartheboiling__12__ofwater,theycouldmakethickercellsthatlargely__13__theStaebler-Wronskieffect.When