简介：

简介：高效率的优点，低SFC(特定的燃料消费)，超离频绕过比率扇涡轮引擎吸引越来越多的注意在现代广告引擎。中间的汽轮机管(ITD)它高连接有低压力的压力汽轮机(HPT)汽轮机(并行口)，由指导流动没有太多损失，从HPT来到并行口在汽轮机的全面表演上有批评影响。因此，掌握设计好攻击的、甚至超级好攻击的ITD的技术变得越来越迫切。更多担心被专注于管。然而，改进汽轮机以便推进，并行口嘴被排列成ITD弄短低压力轴。与如此的设计概念，那块并行口嘴流动地被在上游的管结构容易影响，是明显的，但是相反收到少得多兴趣。在这份报纸，数字方法被用来调查一些ITD的效果与在上游打漩并行口上的片嘴。有一样的九个模型打漩并且嘴片当ITD的长度是唯一的时要换掉的参数，将被讨论。最后，为设计者的几个结论和忠告被总结。在改变管，入口和插头的轴的长度以后，嘴的流动地相应地不同。在另一方面，表面介绍的嘴片(吸和压力)上的砍的压力在各种各样的入口流动下面的单个特征。除了那，像计时的效果在这份报纸被描述，它将贡献大部分到压力损失并且应该被付足够的注意。

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简介：Wedemonstrateanultra-low-thresholdphononlaserusingacoupled-microtoroid-cavitysystembyintroducinganovelcouplingapproach.Theschemeexhibitsbothhighopticalqualityfactorsandhighmechanicalqualityfactors.Wehaveexperimentallyobtainedthemechanicalqualityfactorupto18,000invacuumforaradialbreathingmodeof59.2MHz.Themeasuredphononlasingthresholdisaslowas1.2μW,whichis～5timeslowerthanthepreviousresult.

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简介：Atheoreticaldesignispresentedfora1×Mwavelength-selectiveswitch（WSS）thatroutesanyoneofNincomingwavelengthsignalstoanyoneofMoutputports.Thisplanaron-chipdevicecomprisesofa1×Ndemultiplexer,agroupofNswitching'trees'actuatedbyelectro-opticalorthermo-opticalmeans,andanM-foldsetofN×1multiplexers.Treesutilize1×2switches.TheWSSinsertionlossisproportionalto(log2（M+N+1）)Alongwithcrosstalkfromtrees,crosstalkispresentateachcross-illuminatedwaveguideintersectionwithintheWSS,andthereareatmostN-1suchcrossingsperpath.TheselossandcrosstalkpropertieswilllikelyplaceapracticallimitofN=M=16upontheWSSsize.Byconstrainingthe1×2switchingenergyto1fJ∕bit,wefindthatresonant,narrowband1×2switchesarerequired.The1×2devicesproposedherearenanobeamMach–Zehndersandasymmetriccontra-directionalcouplerswithgratingassistance.

简介：一系列新奇低乐队差距施主领受人(D-A)类型在主要的链(M1)并且在由电子缺乏的领受人块组成的器官的共聚物(BT-F-TPA，BT-CZ-TPA和BT-SI-TPA)悬挂(M2)是与不同电子富人一起的polymerized施主(M3M5)块，即，9,9-dihexyl-9H-fluorene，N-alkyl-2,7-carbazole，和2,6-dithinosilole，分别地经由铃木方法。这些聚合物展出了相对低的乐队差距(1.651.88eV)和宽广吸收范围(680740nm)。作为电子施主合并这些聚合物的体积异质接面(BHJ)太阳能电池，相配与[6,6]-phenyl-C61-butyric酸甲基酉旨(PC61BM)或[6,6]-phenyl-C71-butyric酸甲基酉旨(PC71BM)作为在不同重量的电子领受人，比率下面被制作并且测试与白光的照明的AM1.5的100mW/cm2。包含施主BT-SI-TPA和领受人PC71在1:2重量比率的BM显示出1.88%的最好的力量变换效率(PCE)值，与开的电路电压(Voc)=0.75V，短路电流密度(Jsc)=7.60妈/厘米2,并且充满因素(FF)=33.0%。

简介：Theemissionwavelengthofalaserisphysicallypredeterminedbythegainmediumused.Consequently,arbitrarywavelengthgenerationisafundamentalchallengeinthescienceoflight.Presentsolutionsincludeopticalparametricgeneration,requiringcomplexopticalsetupsandspectrallyslicedsupercontinuum,takingadvantageofasimplerfibertechnology:afixed-wavelengthpumplaserpulseisconvertedintoaspectrallyverybroadbandoutput,fromwhichtherequiredresultingwavelengthisthenopticallyfiltered.Unfortunately,thisprocessisassociatedwithaninherentlypoornoisefigure,whichoftenprecludesmanyrealisticapplicationsofsuchsupercontinuumsources.Here,weshowthatbyaddingonlyonepassiveopticalelement—ataperedphotoniccrystalfiber—toafixed-wavelengthfemtosecondlaser,onecaninaverysimplemannerresonantlyconvertthelaseremissionwavelengthintoanultra-wideandcontinuousrangeofdesiredwavelengths,withverylowinherentnoise,andwithoutmechanicalrealignmentofthelaser.Thisisachievedbyexploitingthedoubleinterplayofnonlinearityandchirpinthelasersourceandchirpandphasematchinginthetaperedfiber.Asafirstdemonstrationofthissimpleandinexpensivetechnology,wepresentafemtosecondfiberlasercontinuouslytunableacrosstheentirered–green–bluespectralrange.

简介：Byovercomingfabricationlimitations,wehavesuccessfullyfabricatedsilicatoroidmicrocavitieswithbothlargediameter(of1.88mm)andultra-high-Qfactor(of3.3×10~8)forthefirsttime,tothebestofourknowledge.Byemployingtheseresonators,wehavefurtherdemonstratedlow-thresholdKerrfrequencycombsonasiliconchip,whichallowustoobtainarepetitionrateaslowas36GHz.Suchalowrepetitionratefrequencycombcannowbedirectlymeasuredthroughacommercializedoptical-electronicdetector.

简介：在在热退火之上的低精力和高剂量他植入6H-SiC的水泡进化被学习。面向的6H-SiC晶片在房间温度在11017厘米2的剂量与15个keV氦离子被植入。样品与培植以后为30min在1073，1173，1273，和1473K的温度被退火。他在晶片起泡经由代表性的传播被检验电子显微镜学(XTEM)分析。nanoscale水泡在同样植入的样品的损坏的层是几乎同类地分布式的在场的结果，和没有重要变化在退火的1073K以后在他植入样品被观察。在退火的1193K之上，在6H-SiC的He-implantation-inducedamorphization的几乎完整的再结晶被观察。另外，直径他起泡显然增加。与不断地增加温度到1273K和1473K，直径他起泡增加和格子缺点的数字密度减少。生长在退火的高温度接受成熟的Ostwald以后，他起泡机制。吝啬的直径他作为退火的一个函数在120-135nm的深度定位的水泡温度被装入产出1.914+0.236eV的一个激活精力的热激活的进程的术语。

简介：Mode-andpolarization-divisionmultiplexingoffernewdimensionstoincreasethetransmissioncapacityofopticalcommunications.Selectiveswitchesarekeycomponentsinreconfigurableopticalnetworknodes.Anon-chipsilicon2×2mode-andpolarization-selectiveswitchthatcanroutefourdatachannelsontwomodesandtwopolarizationssimultaneouslyisproposedandexperimentallydemonstratedforthefirsttime,tothebestofourknowledge.Theoverallinsertionlossesarelowerthan8.6dB.Toreducetheinter-modalcrosstalk,polarizationbeamsplittersareaddedtofiltertheundesiredpolarizationsormodes.Themeasuredinter-modalandintra-modalcrosstalkvaluesarebelow-23.2and-22.8dBforallthechannels,respectively.