D
Batteriescanpoweranythingfromsmallsensorstolargesystems.Whilescientistsarefindingwaystomakethemsmallerbutevenmorepowerful,problemscanarisewhenthesebatteriesaremuchlargerandheavierthanthedevicesthemselves.UniversityofMissouri(MU)researchersaredevelopinganuclearenergysourcethatissmaller,lighterandmoreefficient.
“Toprovideenoughpower,weneedcertainmethodswithhighenergydensity(密度)”，saidJaeKwon,assistantprofessorofelectr icalandcomputerengineeringatMU.“Theradioisotope(放射性同位素)batterycanprovidepowerdensitythatismuchhigherthanchemicalbatteries.”
Kwonandhisresearchteamhavebeenworkingonbuildingasmallnuclearbattery,presentlythesizeandthicknessofapenny,intendedtopowervariousmicro/nanoelectr omechanrealsystems(M/NEMS).Althoughnuclearbatteriescancauseconcerns,Kwonsaidtheyaresafe.
“Peopleheartheword‘nuclear’andthinkofsomethingverydangerous,”hesaid,“However,nuclearpowersourceshavealreadybeensafelypoweringavarietyofdevices,suchaspace-makers,spacesatellitesandunderwatersystems.”
Hisnewideaisnotonlyinthebattery’ssize,butalsoinitssemiconductor(半导体).Kwon’sbatteryusesaliquidsemiconductorratherthanasolidsemiconductor.
“Thekeypartofusingaradioactivebatteryisthatwhenyouharvesttheenergy,partoftheradiationenergycandamagethelatticestr ucture(晶体结构)ofthesolidsemiconductor,”Kwonsaid,“Byusingaliquidsemiconductor,webelievewecanminimizethatproblem.”
TogetherwithJ.DavidRobertson,chemistr yprofessorandassociatedirectoroftheMUResearchReactor,Kwonisworkingtobuildandtestthebattery.Inthefuture,theyhopetoincreasethebattery’spower,shrinkitssizeandtr ywithvariousothermaterials.Kwonsaidthatbatterycouldbethinnerthanthethicknessofhumanhair.
71.Whichofthefollowingistr ueofJaeKwon?
A.Heteacheschemistr yatMU.
B.Hedevelopedachemicalbattery.
C.Heisworkingonanuclearenergysource.
D.Hemadeabreakthroughincomputerengineering.
正确答案：C细节理解题。根据第三段的叙述可知Kwon在研究一种原子能电池，所以C项正确。
