简介:Theinvestigationsofsurfacephotovoltagespectraareperformedonthinfilmsofpoly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene]inordertodetermineitsphotoelectricproperties.Itisfoundthatalocalizedsubgapelectronictransitioncausesapolarityoppositeband-to-bandelectronictransition(π-π*).Thistransitionresultsinanelectronicleveltransitionfromthevalencebandtoalocalstateintheconductionband.
简介:摘要:某发电公司一、二号机组为330MW燃煤发电供热机组,采用武汉锅炉厂制造的WGZ1206/17.5-1型循环汽包锅炉,单机锅炉给水系统有两台汽动给水泵和一台电动给水泵组成。其中汽动给水系统小汽轮机有大机四段抽汽或辅汽联箱供小汽轮机动力汽源,气动给水泵MEH/METS控制系统由DCS系统的一个独立控制站完成。自投产以来由于汽动给水泵控制和跳闸逻辑存在漏洞、接线不可靠,多次出现小汽轮机误跳机现象。技术人员通过逻辑梳理、接线排查、对汽动给水泵逻辑进行分析探讨,并重新优化控制和跳机逻辑,治理控制回路接线,减少和杜绝了汽动给水泵误跳机的次数。从而提高了锅炉给水系统运行的稳定性,使机组运行的安全性与经济效益有了显著提升。
简介:Efficientdeep-redorganiclight-emittingdiodes(OLEDs)wereinvestigatedbasedontheblendofpoly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylenevinylene](MEH-PPV)with4,7-bis(5-(7-(9H-carbazol-9-yl)-9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole(compound1).Byoptimizingtheblendratio,theturn-onvoltageofthedeviceswassignificantlyreducedfrom4.9Vto2.4V.Ahighestexternalquantumefficiencyof2.56%wasachievedatablendratioof95:5(wt)forcompound1:MEH-PPV.TheCIEcoordinatewasmeasuredtobe(0.70,0.30),withtheluminescencepeakataround680nm.Basedonexperimentalobservationstheimprovementmechanismisdescribed.