2017职称英语理工类c考前冲刺训练[权威资料]

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1、2017职称英语理工类C考前冲刺训练本文档格式为WORD,感谢你的阅读。最新最全的学术论文期刊文献年终总结年终报告工作总结个人总结述职报告实习报告单位总结演讲稿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!　　BetterSolarEnergySystems:MoreHeat,MoreLight　　Solarphotovoltaicthermalenergysystems,orPVTs,generatebothheatandelec

2、tricity,but__1__nowtheyhaven’tbeenverygoodattheheat-generatingpartcomparedtoastand-alonesolarthermalcollector.That’sbecausetheyoperateatlowtemperaturestocoolcrystallinesiliconsolarcells,whichletsthesilicongeneratemore__2__butisn’taveryefficientwaytogatherheat.　　That’saproblemof__3_.Goo

3、dsolarhot-watersystemscanharvestmuchmoreenergythanasolar-electricsystematasubstantiallylower__4__.Andit，salsoaspaceproblem：photovoltaiccellscantakeupallthespaceontheroof,leavinglittleroomforthermalapplications.　　Inapairofstudies,JoshuaPearce,anassociateprofessorofmaterialsscienceandeng

4、ineering,hasdeviseda__5__intheformofabetterPVTmadewithadifferentkindofsilicon.HisresearchcollaboratorsareKunalGirotrafromThinSiliconinCaliforniaandMichaelPathakandStephenHarrisonfromQueen’sUniversity,Canada."　　Mostsolarpanelsaremadewithcrystallinesilicon，butyoucanalsomakesolarcellsouto

5、famorphoussilicon,__6__knownasthin-filmsilicon.Theydon’tcreateasmuchelectricity,buttheyarelighter,flexible,andcheaper.And,becausethey__7__muchlesssilicon,theyhaveagreenerfootprint.Unfortunately，thin-filmsiliconsolarcellsare__8__tosomebad-newsphysicsintheformoftheStaebler-Wronskieffect.

6、　　“Thatmeansthattheirefficiency__9__whenyouexposethemtolight—prettymuchtheworstpossibleeffectforasolarcell,”Pearceexplains，whichisoneofthe__10__thin-filmsolarpanelsmakeuponlyasmallfractionofthemarket.　　However,PearceandhisteamfoundawaytoengineeraroundtheStaebler-Wronskieffectbyincorpor

7、atingthin-filmsiliconinanew__11__ofPVT.Youdon’thavetocooldownthin-filmsilicontomakeitwork.Infact，Pearce’sgroupdiscoveredthatbyheatingittosolar-thermaloperatingtemperatures，neartheboiling__12__ofwater,theycouldmakethickercellsthatlargely__13__theStaebler-Wronskieffect.Whentheyappliedt