简介：Weexperimentallydemonstratea16×16reconfigurablynonblockingopticalswitchfabricusingaBenesarchitecture.Theswitchfabricconsistsof562×2Mach–Zehnderinterferometerbasedelementaryswitches,witheachintegratedwithapairofwaveguidemicroheaters.Theaverageon-chipinsertionlossis~5.2dBforbothofthe'all-cross'andthe'all-bar'states,withalossvariationof1dBoverallroutingpaths.Thecrosstalkforallswitchingstatesisbetterthan-30dB.Theswitchingtimeoftheswitchelementisabout22μs.Theswitchingfunctionalityisverifiedbytransmissionofa40Gb∕squadraturephase-shiftkeyingopticalsignal.

简介：ThepresolarSiCgrains[1]carrytheoriginalstellarnucleosynthesissignature.Theirisotopicanomaliescomparedtothesunarethestrongconstrainsinthesupernovae(SN)modelcalculations.The15N-excessinsomeSiC-ABgrains(12C/13C<10and14N/15N<272)isoneofthechallengesofcore-collapsesupernovae(CCSNe)models[2].Recently,PignataripointedoutthattheentrainmentofH-richmaterialintotheHeshellbeforetheSNexplosionallowsthecoproductionof13C,15Nand26Al,whichprovidesanewproductionscenarioforSiC-ABgrains[2].IntheHeshellnucleosynthesis,the13Cisproducedthrough12C(p,γ)13N(β+γ)13Creaction.The14Nissynthesizedthrough13N(n,γ)and13C(p,γ)reactions.

简介：AbinitiomolecularorbitalcalculationsofdoublynegativechargedB16H162-(D2)andneutralB16H16(Td)havebeendoneattheHF/6-31Glevel.TheyarepredictedtobechemicallyandkineticallystablebyvibrationalanalysesontheirrespectiveenergyhypersurfaceoftheHF/6-31Glevel.ThegeometricalstructureofthespeciesB16H1622-(D2)wasdiscussed.

简介：基于介观电路中电荷的量子化特性和介观电容中存在弱耦合效应的物理事实,对介观LC电路进行了量子力学处理,并讨论了电路中的类超导电流的量子特性。结果表明:无源情形时介观LC电路中类超导电流随时间变化具有周期性,其平均值为零;在直流稳压电源的作用下类超导电流存在直流分量,总电流平均值存在shapiro台阶;在交流电源的作用下类超导电流也可以存在直流分量,但总电流平均值不存在Shapiro台阶。

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简介：锦界选煤厂根据具体生产情况,针对影响重介质选煤厂介耗的主要因素,提出通过设计增加介质小循环工艺、分流装置改造、提高磁选机的磁选效率、固定筛改造、加强选煤厂生产现场管理等降低介耗的措施。

简介：Withabout20permanentstaffandseveralgraduatestudents,IonSourceGroupisdoingpioneeringworkinhighperformanceECRandLaserionsourcedevelopment,ionsourceplasmastudy,ionsourceapplicationandroutineoperationfornationallaboratory.In2016,withthegreatcontributionsoftheteammembers,manyverypromisingresultsandachievementshavebeenmade.FortheroutineoperationofHIRFLfacility,threeionsources,i.e.

简介：利用蒙特卡洛方法分析了不同束流密度0.8MeV电子辐照下介电材料导电性能的变化趋势,同时开展了0.8MeV电子辐照下聚酰亚胺(Kapton)材料导电性能实验研究.理论和实验结果表明,在0.8MeV电子辐照后,Kapton材料导电性能在不同吸收剂量率下变化较大,电导率最大可上升5个量级,电阻由1014Ω变为1012Ω,下降2个量级.

简介：A16-channeldualtuningwavelengthdivisionmultiplexer/demultiplexerbasedonsilicononinsulatorplatformisdemonstrated,whichisbothpeakwavelengthtunableandoutputopticalpowertunable.Thewavelengthdivisionmultiplexer/demultiplexerconsistsofanarrayedwaveguidegratingforwavelengthdivisionmultiplexing/demultiplexing,aheaterforpeakwavelengthtuningandavariableopticalattenuatorbasedonp–i–ncarrier-injectionstructureforopticalpowertuning.Theexperimentalresultsshowthattheinsertionlossonchipofthedeviceis3.7dB–5.7dBandthecrosstalkis7.5dB–9dB.Forthetunabilityofthepeakwavelength,1.058-nmwavelengthtunabilityisachievedwith271.2-mWpowerconsumption,andtheaveragemodulationefficiencyis3.9244nm/W;forthetunabilityoftheopticalpower,theopticalpowerequalizationisachievedinall16channels,20-dBattenuationisachievedwith144.07-mWpowerconsumption,andtheraise/falltimeofVOAis35ns/42ns.

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简介：采用原位模板法（软模板）,以可溶性酚醛树脂（苯酚-甲醛）为碳源、三嵌段共聚物（F127）为结构导向剂、水热合成了形貌可控制的棒状有序介孔碳.利用XRD、TEM、N2吸附-脱附法和拉曼光谱法等方法对材料的结构和形貌进行表征.结果表明,当水热温度180℃时,所合成的有序介孔碳具有明显的棒状形貌,而且良好的有序度,比表面积较大,长度均为400500nm.

简介：Spallationtargetrepresentsoneofthemostchallengingcomponentsinacceleratordrivensystems(ADS)sinceitisthecomponentcouplingtheacceleratorandthesub-criticalcore.Itissubjectedtobombardmentofintenseprotonbeamandveryhighthermalloadinastrongradiationfield.TheirradiatedLBEtargetposesseverehandlingproblemsforthemaintenancestaffandotherscientistsduetoitsresidualactivity[1].ToassistthedesignofADS,thegeneralradiologicalsafetyaspectsoflead,lead-bismutheutectic(LBE)andtungstenspallationtargetwerestudiedwithMCNPX2.7code[2].Thespallationtargetwasirradiatedbya250MeV,10mAprotonbeamproducedbyalinearprotonaccelerator.Theneutronyield,neutronspectrum,residualproductionandtimeevolutionfortheirradiatedtargetwereanalyzed.

简介：Ｓｔｕｄｙ　ｏｆ　Ｆｕｓｉｏｎ　ｗｉｔｈ　Ｂｉｎａｒｙ　Ｐｒｏｃｅｓｓ　ｉｎ　１６Ｏ＋４５Ｓｃ　ＲｅａｃｔｉｏｎＳｔｕｄｙｏｆＦｕｓｉｏｎｗｉｔｈＢｉｎａｒｙＰｒｏｃｅｓｓｉｎ１６Ｏ＋４５ＳｃＲｅａｃｔｉｏｎ￥ＷａｎｇＳｈｕｆａｎ...

简介：Differentinterpretationsareintroducedtodescribetheuprisingoscillatorystructuresof^16O+^24Mgreaction.Thegrossresonantstructurestotheground-andfirst-excitedstateshavebeenstudiedsuccessfullyintermsofboththeDWBAandcoupledchannelcalculations.TheDWBAresultsintroduceareasonabledescriptionoftheangulardistributionsandexcitationfunctiondata.ThecoupledchannelcalculationsprovideabetteragreementwiththeexperimentalforwardandbackwardangledatathantheDWBAcalculations.

简介：<正>图形与证明是空间与图形的核心内容之一,它贯穿在整个几何知识的学习及运用之中.现结合2013年全国各地中考试题对这部分内容进行分析,供同学们参考.一、中考内容要求课标要求学生掌握基本的图形基础知识与基本技

简介：维生素E作为聚烯烃主抗氧剂的应用可以说是20世纪90年代聚合物稳定化领域的一个重要成果。维生素E的有效成分为a-生育酚（ATP），ATP不仅显示极高的抗氧活性，而且可以消除或降低塑料包装材料内的异味，因此塑料包装业特别是食品和医药的生产厂商对此表现出极大兴趣。

简介：以硅酸钠为原料,CTAB为模板剂,水热法合成MCM-41介孔分子筛,采用浸渍法制备负载钴的介孔分子筛（Co/MCM-41）,并将其作为催化剂,CVD法热解无水乙醇制备CNTs.利用XRD、TEM、比表面积和孔径分布测定和Raman光谱等方法对所合成的介孔分子筛和纳米碳管进行了表征.结果表明：所制备的Co/MCM-41样品具有典型的MCM-41的介孔结构;当热解反应温度为750℃下所制备出的纳米碳管的品质最好.

简介：以PbO，MgO，Nb2O5，TiO2为原料，采用两步固态反应法制备了纯钙钛矿相的0．92PMN-0．08PT陶瓷，并对其相的组成、微观形貌、介电性能和储能性能进行了研究。在25℃，1kHz条件下，该陶瓷的相对介电常数高达27480，介电损耗tan艿仅为4％，电滞回线形状细长，剩余极化很小，可释放的能量密度达0．31J·cm-3.结果表明：室温下该陶瓷具有优良的介电和储能性能。