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简介:Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.
简介:摘要“Z+Z”的智能化程度更高。可以制作数学动画,展示数学知识发生与发展的过程,并在运动变化中呈现数学之美,使学习成为趣味盎然的富有吸引力的活动。可以化静为动、化抽象为形象,弥补了传统教学方式在直观感、立体感和动态感等方面的不足,为教师化解教学难点、突破教学重点、提高课堂效率提供了一种现代化的教学手段。
简介:Inthispaper,normalincidenceverticalp-i-nphotodetectorsonagermanium-on-insulator(GOI)platformweredemonstrated.Theverticalp-i-nstructurewasrealizedbyion-implantingboronandarsenicatthebottomandtopoftheGelayer,respectively,duringtheGOIfabrication.Abruptdopingprofileswereverifiedinthetransferredhigh-qualityGelayer.Thephotodetectorsexhibitadarkcurrentdensityof~47mA∕cm~2at-1Vandanopticalresponsivityof0.39A/Wat1550nm,whichareimprovedcomparedwithstate-of-the-artdemonstratedGOIphotodetectors.Aninternalquantumefficiencyof~97%indicatesexcellentcarriercollectionefficiencyofthedevice.Thephotodetectorswithmesadiameterof60μmexhibita3dBbandwidthof~1GHz,whichagreeswellwiththeoreticalcalculations.Thebandwidthisexpectedtoimproveto~32GHzwithmesadiameterof10μm.ThisworkcouldbesimilarlyextendedtoGOIplatformswithotherintermediatelayersandpotentiallyenrichthefunctionaldiversityofGOIfornear-infraredsensingandcommunicationintegratedwithGeCMOSandmid-infraredphotonics.
简介:摘要目的研究评估抗N-甲基-D-天门冬氨酸受体脑炎与病毒性脑炎两者异同及关系。方法将我院32名脑炎患者作为研究对象,分析统计两组患者既往疾病史、临床表现、腰椎穿刺压力、脑脊液蛋白质含量。结果研究组中有9名患者亚急性发病,占56.52%;对照组中有12名患者急性发病,占75%,两组对比差异具有统计学意义(P<0.05)。研究组中主要首发症状癫痫(36%)、认知障碍(21%),存在头痛及体温等感染症状有5名患者(31.25%),对照组中主要表现为前驱非特异性感染症状,10名患者发热(62.5%),伴有癫痫(17%)发生与认知障碍(18%),两组对比差异具有统计学意义(P<0.05)。研究组中有5名(31.25%)患者腰穿压力升高,对照组中12名(75%)患者腰椎穿刺压力有所升高,研究组脑脊液蛋白质含量6名(37.5%)患者有轻微升高,对照组13名(81.25%)患者蛋白质含量升高,对照组患者脑脊液蛋白质含量升高患者相比于研究组明显偏多。结论病毒性脑炎患者出现前驱症状较多,且急性发病多见,脑脊液蛋白质含量比升高显著,两组患者既往疾病史方面差异不明显。
简介:这天一大早,阿P的手机就陆续收到短信,他这才想起,今天是自己的生日,短信都是各种平台和公众号发来的温馨祝贺。一时之间,阿P心里暖暖的。小兰瞄了阿P一眼,说:'阿P,今天生日打算咋过?'阿P满不在乎地说:'简单点吧,下班时我买个蛋糕,回家小小地庆祝一下就可以了,也不打算在
简介:富强乡财政紧张,新来的乡长急得团团转,听说阿P足智多谋,便把他找来想对策。阿P一直是乡里的红人,对乡长说:'其实对策我早就想好了,现在流行众筹,咱们何不尝试一下?'乡长心头一动,称赞道:'这主意好啊,只是众筹的数额有点大,行得通吗?'阿P笑着说:'乡长发令有什么行不通的?谁能不给乡长面
简介:最近城里流行来农村骑马种菜,美其名曰体验生活,阿P也赶时髦,开起了农家乐,还带回来一匹小马驹,雪白雪白的,起名小白龙。有一回,《新西游记》剧组路过阿P他们村,导演相中了小白龙,花钱租下给唐僧当坐骑。这下,小
简介:Anenvironmentallyfriendlyprecursor,adenosine,hasbeenusedasadualsourceofCandNtosynthesizenitrogen-dopedcarboncatalystwith/withoutFe.Ahydrothermalcarbonizationmethodhasbeenusedandwateristhecarbonizationmedia.Themorphologyofsampleswith/withoutFecomponenthasbeencomparedbyHRTEM,andtheresultshowsthatFecanpromotethegraphitizationofcarbon.Furtherelectro-chemicaltestshowsthattheoxygenreductionreaction(ORR)catalyticactivityofFe-containingsample(C–FeN)ismuchhigherthanthatoftheFe-freesample(C–N).Additionally,theintermediatesofC–FeNformedduringeachsyntheticprocedurehavebeenthoroughlycharacterizedbymultiplemethods,andthefunctionofeachprocedurehasbeendiscussed.TheC–FeNsampleexhibitshighelectro-catalyticstabilityandsuperiorelectro-catalyticactivitytowardORRinalkalinemedia,withitshalf-wavepotential20mVlowerthanthatofcommercialPt/C(40wt%).Itisfurtherincorporatedintoalkalinepolymerelectrolytefuelcell(APEFC)asthecathodematerialandledtoapowerdensityof100mW/cm~2.