简介:Asanimportantmulti-functionalmaterialappliedinsurfaceacousticwavedevices,opticalcommunications,laserandoptoelectronicsduetoitsgoodphotoelectricandpiezoelectricproperties,lithiumtantalate(LiTaO3)hasdrawnextensiveinterests[1].NumerousphysicalpropertiesofLiTaO3,suchasacoustical,electronicstructures,opticalpropertiesandeffectivemass,thermodynamicproperties,havebeenreportedinseveralpapers.Pointdefectswillaffecttheelectronicstructurewhichshouldberesponsibleformanyphysicalproperties,especiallyopticalproperties.
简介:摘要目的探讨导乐分娩配合GT-4A电脑疼痛治疗仪减轻产痛的效果及对产程和分娩方式的影响。方法对100例初产妇采用随机和自愿的原则分为2组,观察组50例实行导乐分娩配合GT-4A电脑疼痛治疗仪镇痛分娩。对照组50例实行传统方法待产。比较两者产痛效果、产程进展、分娩方式。结果观察组镇痛效果明显镇痛有效率100%,第一产程和总产程明显缩短,两组难产率比较有显著性差异(P<O.01),观察组明显低于对照组。结论导乐分娩配合GT-4A电脑镇痛仪镇痛分娩效果良好,能减轻产痛,加速产程进展,操作简单方便,产妇乐于接受,降低剖宫产率,促进自然分娩。
简介:Eu3+activatedSr1–xEuxZrO3(x=0.01–0.04)phosphorwithperovskitestructurewassuccessfullysynthesizedbyusingcombustionmethod.Thestructure,morphologyandopticalpropertiesofthematerialwerecharacterizedbyX-raydiffraction,scanningelectronmicroscopyandfluorescencespectrometry.TheXRDresultsindicatedthatcrystalsofSrZrO3:Eu3+belongstotetragonalperovskitesystem.ThephosphorcouldbeeffectivelyexcitedbyUVlightandtheemissionspectraresultsindicatedthatreddish-orangeluminescenceofSrZrO3:Eu3+duetomagneticdipoletransition5D0→7F1at593nmwasdominant.Thus,thepreparedphosphorshowedremarkableluminescentpropertieswhichfindapplicationsinfieldemissiondisplay(FED)andplasmadisplaypanel(PDP)devices.
简介:本书为研究古代散曲学的开山之作,任中敏先生精心搜集了元明以来的散曲选本凡12种,其中元人选本2种:杨朝英《阳春白雪》、胡存善《乐府群玉》;元人专集4种:马致远《东篱乐府》,乔吉《梦符散曲》,张可久《小山乐府》,贯云石、徐再思《酸甜乐府》;明人专集5种:康海《游东乐府》、王磐《王西楼先生乐府》、冯惟敏《海浮山堂词稿》、沈仕《唾窗绒》、施绍莘《花影集》;清人总集1种:朱彝尊等《清人散曲选刊》;另有任氏自撰曲学著作3种:《作词十法疏证》、《散曲概论》、《曲谐》。这些著作多从元明以来的别集、曲选、笔记中搜集而来,广罗众本,校其异同,辑佚辨伪,有散曲集大成之性质。原书为仿宋版,无标点。本次整理,采用横排版式,加以新式标点。并对原文字句作了校勘,以“今校”的形式补其初版讹误与未备。
简介:Enhanced2.7μmemissionisobtainedinEr3+/Tm3+andEr3+/Ho3+codopedZBYAglasses.Absorptionandemissionspectraaretestedtocharacterizethe2.7μmemissionpropertiesofEr3+/Tm3+andEr3+/Ho3+dopedZBYAglassesandareasonableenergytransfermechanismof2.7μmemissionbetweenEr3+andTm3+Ho3+)ionisproposed.CodopingofTm3+orHo3+significantlyreducesthelifetimeoftheEr3+:4I13/2levelduetotheenergytransferofEr3+:4I13/2→Tm3+:3F4orEr3+:4I13/2→Ho3+:5I7.Thus,the2.7μmemissionisstrengthenedandthe1.5μmemissionisdecreasedaccordinglyespeciallyintheEr3+/Tm3+sample.TheupconversioneffectsbetweentheEr3+/Tm3+andEr3+/Ho3+dopedZBYAglassesaredifferentattributetothedifferentenergytransferefficiencies.Bothofthetwocodopedsamplespossessnearlyequallargeemissioncrosssection(16.6×10-21cm-2)around2.7μm.TheresultsindicatethatthisEr3+/Tm3+orEr3+/Ho3+dopedZBYAglasshaspotentialapplicationsin2.7μmlaser.