简介：ThelowresistancePTCceramicthermistormaterialwithexcellenteleectricalpropertiesaresuccessfullyfabricatedbyrawmaterialsatindustrialrangemadeinourcountryonthestudyofitscompositionexpressionandfabricationprocessbyusingtheadditionofNb,La,Y,Ta,microstructureregulatorBNandASTLphase.Thecompositionanditsfabricationmethodarestudied.TherelationofelectricalpropertiesofthePTCceramicmaterialtoitscompositionexpressionanditsrelatedelectricalpropertiesarediscussed.

简介：在微弱地指导的盒子中，在核心和左手的材料纤维的cladding的力量繁殖被解决麦克斯韦鈥檚方程获得。波导效率在截止并且远离截止被分析。远离截止，波导效率等于到1。在截止，为m=0，1，波导效率平等者到零；为m=2，波导效率来临到无限；为m>2，波导效率是不到零，但是它的绝对值比1大。那些是左手的材料纤维的新奇特征。CLC数字TN253这个工作被中国(60277025)和上海领先的学术学科工程(T0102)的国家性质科学基础支持

简介：TheultimatedetectionperformanceofHgCdTe,quantumwell(QW)andextrinsicSidetectorsunderlowtemperaturesisanalyzed.Thetheoreticallimitsoftheinternalphotonresponseforthethreedetectorsarecompared.Thematerialsofspace-baseddetectorsinspacetrackingandsurveillancesystem(STSS)arediscussed.Theresultsshowthatamongthreedetectors,thebestperformancecanbeobtainedfromHgCdTedetectorsunder40Kinthemid-longwaveinfrared(MLWIR)andlongwaveinfrared(LWIR)spectralregions.ItsultimatedetectivityintheMLWIRspectralregion,withacutoffwavelengthof8μm,isontheorderof1×1018cm·Hz1/2/W.AndthatintheLWIRspectralregion,withcutoffwavelengthsof12μm,16μmand20μm,isontheorderof1×1015cm·Hz1/2/W,1×1014cm·Hz1/2/Wand1×1013cm·Hz1/2/W,respectively.

简介：ThisSpecialSectiononEnergy,Materials,andNanotechnology(EMN),JournalofElectronicScienceandTechnology(JEST),presentsabroadrangeofinterdisciplinaryandmultidisciplinaryresearchintocutting-edgescientificconceptstowardsmaterialssynthesis,characterization,andnoveltechnologydevelopments.

简介：新防护材料成为了一种选择到传统的金属从电磁的干扰防护盒子。这篇文章介绍传播线方法的理论学习用材料的一个新种类做的盾盒子，然后扩展基本公式与任意的角度处理多重洞和极化的诉讼。借助于基因算法在三个维的模拟工具的帮助下，在围场抑制电磁的回声被研究。计算显示在反响的频率下面，电磁的回声导致低、平否定防护系数；而为一样的区域，防护一个单个洞的有效性比多重洞的更坏。当时，防护系数变化极化角度增加，和通过有到薄电线的长方面平行的矩形的孔的联合领域与对薄电线垂直的长方面是比那弱得多的。由在洞的内部表面上使用优化计算的金属性损失的绝缘的层，回声抑制的最好的结果与涂层的一样的厚度被认识到。根据计算结果，最后，为防护的建议被建议。

简介：ThecrystallographicpropertiesandRamanspectraofthetitlecompoundZnCd(SCN)4,whichisanewnonlinearopticalcrystal(NLO),arereportedforthefirsttime,ThiscrystalisorthorhombicanditsspacegroupisI4^4withunitcellparametersa=1.135(0.2)nmc=0.43760(1)nm.Therearetwoformulasperunitcell.Ramanspectraofzinccadmiumthiocyanatec(ZCTC)aregivenandtheelectronactivitiesinthecrystalareshown.

简介：晶片水平密封包裹方法与benzo-cyclo-butene(BCB)为optoelectronic在低温度试验性地被学习材料。结果证明结合的温度在250℃下面，两silicon-BCB-siliconandsilicon-BCB-glass的密封能力包装的氦比6X10~好(-4)Pa吗？cm~3/s。剪切强度为包裹是足够的。hermeticity在15个周期以后仍然好“热吃惊测试。在来自洞的漏率和到设备边阶的距离之间的Therelationship也与一个渗出物模型被讨论。

简介：Theprogramprocessofthelongitudinalimpurityprofileintroducedinthequantumwell(QW)laserandmicrowaveelectronicmaterialsinanalysed,basedonthegrowthsystembymetalorganicchemicalvapordeposition(MOCVD)andmicrowaveelectronicmaterialsandchloridevaporphaseepitaxy(VPE).Thequantitativesolutionofthefinallongitudinaldirectionimpuritydistributionusingthemathematicalphysicsmodelofimpuritycarrier-gastransportdriftandrediffusioningrowthprocesswascarriedout.Atechnologyforgivingareferencetogrownimputityprofileofabruptdopinganduniformlongitudinaldirectionbasedonthetheoryispresented.

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简介：Synthesisof9,9-bis(buthoxycarbonylethyl)fluorine(C27H34O4,Mr=422.54)withbutylacrylateasalkylationreagentandfluoreneasstartingmaterialhasbeenperformed.ThecrystalstructurewasmeasuredbyusingtheX-raydiffractionmethod.Thecrystalbelongstomonoclinic,spacegroupP2(1)/cwithparametersas:a=1.2912(1)nm,b=1.0974(1)nm,c=1.7468(1)nm,β=90.252(2),V=2.4752(4)nm3,Z=4,Dcacl=1.134g·cm-3,λ=0.071073nm,μ(MoKα)=0.075mm-1,F(000)=912,R=0.0651andwR=0.1475.X-rayanalysisrevealsthatthethreefusedringsofthefluorenesystemarealmostcoplanarandthetwoestergroupsarenearlyperpendiculartothefused-ringsystem,weakCHOhydrogen-bondingconnectsthemoleculeintocentrosymmetricdimmers

简介：Thebandgappropertiesofone-dimensionalphotoniccrystalswithadefectlayerofnegativerefractiveindexmaterialsarestudied.Thedefectmodewidthisbiggerthanthatofconventionalone-dimensionalphotoniccrystalswithadefectlayerofpositiverefractiveindexmaterials.Thedefectmodeoftheformerisdifferentfromthatofthelatter,shiftstowardsthedirectionofhighfrequency(shortwavelength),andhasabiggershiftingvelocity.Furthermoretheeffectsonthetransmissionpropertiesoftheformerphotoniccrystalscausedbychangeinthepositionofthedefectlayerofnegativerefractiveindexareinvestigated.Finallytheopticalenhancementoftheformerphotoniccrystalsisalsoinvestigated.

简介：Differentmaterial-dopedRamanfiberlaserswithveryhighefficiencyoperatingincontinuous-wavearepresented.With1WNd∶YVO4laserpumpingatwavelengthof1342nm,singlemodeoutputpowerofabove500mW(optical-to-opticalconversionefficiencyof50%)issimulatedintherangeof1400-1500nm.Usinghigh-germanium,high-phosphateandhigh-boratesilicatefibersasthegainmedium,laseroutputatwavelengthsof1420,1450,1480and1495nmcanbeachievedwithdifferentgeometries,whicharejustaspumpingC-bandandL-banddistributedRamanfiberamplifiers.