简介：

简介：TheinfluencesofboththevolumeofPS/toluenesolutionintheUbbelohdeviscometerandtheprecisionofthetimemeasuringontheviscositybehaviorindiluteandextremelydiluteconcentrationregionareinvestigatedItwasfoundthattheinfluenceoftheformercanneglect,butthatofthelatterissoprominentthatthedatafluctuatebitterlyandlinearityofthecurveofthereducedviscosityvs.Concentration(ηsp/c～c)becomestoobadtoobeytheHugginsequationdowntotheextremelydiluteregion,despitetheerroroftheflowtimes△t≤0.2s,whichispermittedbytheconventionalmethodofviscositymeasurement.Throughstrictmathematicalanalyses,itwasfoundthatthcerror(E)ofthereducedviscosityisinproportionandinverseproportionto△tandconcentrationc,respectively.Sothelesstheconcentration,themoretheerroris.Consequently,alowestconcentrationlimitcLcorrespondingtogivenexperimentalerrormayexistanditwillbemeaninglessforfurtheroperationbelowcLbecauseofthegreatfluctuationofthedata.Therefore,itneedstoseriouslyreconsidertheapplicationoftheconventionalmethodofUbbelohdeviscositymeasurementintheextremelydilutepolymersolutionundertraditionalconditionsbecauseofthegreatinfluenceoftheexperimentalerror.

简介：

简介：ThelasersystemPALS,asadriverofabroad-beamionsource,delivereddeuteronswhichgeneratedneutronswithenergieshigherthan14MeVthroughthe7Li(d,n)8Bereaction.Deuteronswithsub-MeVenergywereacceleratedfromthefrontsurfaceofamassiveCD2targetinthebackwarddirectionwithrespecttothelaserbeamvector.Simultaneously,neutronswereemittedfromtheprimaryCD2targetandasecondaryLiFcatcher.Thetotalmaximummeasuredneutronyieldfrom2D(d,n)3He,7Li(d,n)8Be,12C(d,n)13Nreactionswas～3.5(±0.5)×108neutrons/shot.

简介：AseriesofPS-PPACwasdevelopedandthepositionresolutionwassuccessivelyimprovedbyusinordertomeettheneedofheavyionphysicsresearch.ThePS-PPACmaybedividedintotwogroups.1PS-PPACusedforstable(ion)bearna)Doublegridpositionsensitiveavalanchechamber(DGAC)~[1].DGACconsistsof4electrodes:anodeA,cathodeC,gridsKandG,whicharemadeofwireplanes.Thesensitiveareawas25×20cm~2.Aposition

简介：

简介：这篇文章介绍一条灵巧的途径给聚苯乙烯/银(PS/Ag)的准备不对称的混合粒子。在这个方法，polystyrene/polyglycidylmethacrylate(PS/PGMA)Janus粒子经由dichloromethane(DCM)的蒸发从PS/PGMA/DCM-in水乳剂微滴触发的内部阶段分离被综合。然后，Janus粒子是aminated并且顺序获得PS/PGMA-NH2和PS/PGMA-COOH粒子的carboxylated。在由与amine/carboxyl协调的functionalizedPS/PGMA粒子的PGMA半球的表面上自我装配的Ag+。有Ag的7.29wt%的PS/Ag不对称的混合粒子被Ag+的减小获得。扫描电子显微镜学，精力散的X光检查光谱学和传播电子显微镜学结果证实Ag在聚合物粒子的表面上是不均匀地分布式的。

简介：利用质谱法定量分析了^6Li（n，α）T反应中伴随产生的^4He核，得到了产氚量。采用自膨胀密封方法在常温下定量制备了密封锂铅合金靶。靶件在西安脉冲堆的跑兔辐照通道内辐照了2h，冷却15d后进行测量。建立了去除氢同位素干扰的气体样品处理平台，并以含氢的模拟标准气进行了验证。研究并建立了测量。He的在线同位素稀释法，并用空气进行了验证。靶件在700℃被熔融后释放^4He，首次熔融的^4He释放率达到99．9％，产氚量测量结果的不确定度小于6％。

简介：我们介绍自发的对称碎在Pati之间的acouplingbetween的顺序—Salam和电镀物品弱对称苏(4)_(PS)直接X苏(4)_(EW)可伸缩以便在宏大统一精力在联合常数之中建立一种算术地一致的关系。与减已知的夸克和雷普顿的雷普顿量数字那里的酒吧的价值，由传递includingright的中微子，我们能在直到电磁的U(1)_(他们)的层次放大的不同精力发现混合角度关系。

简介：Inthispaper,twokindsofPS-PTCsweresynthesizedusingdifferentmethodsbyintroducingcinchonineandquininetothepolymersupport.TheircatalyticpropertiesforthealkylationofN-diphenylmethyleneglycinet-butylesterwerealsocompared.

简介：6,9,11-Trihydroxy-6a,12a-dehydrorotenoid1(coccineoneB)wassynthesizedfrom2-hydroxybenzaldehyde2andphloroglucinol.

简介：

简介：Thehybridstructuresofpolystyrene-b-poly(ethyleneoxide)(PS-b-PEO)blockcopolymerandinorganicnanoparticleswithgoodstabilityandbiocompatibilityhavepotentialapplicationsindrugdeliveryandbioimaging.Sphericalco-assembliesofPS120-b-PEO318andoleylamine-cappedCdSquantumdots(QDs)areproducedsuccessfullyinthisworkbyaddingwatertoamixedcommonsolvent,suchasN,N-dimethylmethanamide(DMF)/chloroform,DMF/tetrahydrofuran(THF),orDMF/toluene.TheenergydispersiveX-ray(EDX)spectrumindicatesthatQDsarelocatedattheinterfacebetweenthecoreandshellofthesphericalco-assemblies.Theco-assemblyprocessduringwateradditionistracedbytransmissionelectronmicroscopy(TEM)andturbiditymeasurement.Sphericalco-assembliesareformedthroughbuddingfrombilayersoftheblockcopolymerandQDs.Themorphologyoftheco-assembliesisrelatedtothemiscibilityoftheQD-dispersingsolventswithwaterandthemorphologychangesfromasphericaltoavesicle-likestructurewithDMF/toluene.IncreasingTHFcontentinthemixedsolventcausesmorphologicaltransitionsfromsphericalco-assembliestomulti-branchedcylindersandmicelleswhereQDsarelocatedinthecentralcore.Increasingchloroformcontentyieldsvesicle-likestructureswithprotrudingrodsonthesurface.Themechanismofthemorphologicaltransitionsisalsodiscussedindetail.

简介：Quasiclassicaltrajectorycalculation(QCT)isusedfrequentlyforstudyingcollisionalenergytransferbetweenhighlyvibrationallyexcitedmoleculesandbathgases.Inthispaper,theQCToftheenergytransferbetweenhighlyvibrationallyexcitedC6F6andN2,O2andgroundstateC6F6wereperformed.TheresultsindicatethathighlyvibrationallyexcitedC6F6transferredvibrationalenergytovibrationaldistributionofN2,O2andgroundstateC6F6,sotheyareV-Venergytransfer.EspeciallyitismainlyV-VresonanceenergytransferbetweenexcitedC6F6andgroundstateC6F6,excitedC6F6transfersmorevibrationalenergytogroundstateC6F6thantoN2andO2.ThevaluesofQCT,-〈△Evib〉ofexcitedC6F6aresmallerthanthoseofexperiments.

简介：

简介：TheimportanceoftheInternettomodernHighEnergyPhysicsCollaboratorsisclearlyimmense,andunderstandinghownewdevelopmentsinnetworktechnologyimpactnetworksiscriticaltothefuturedesignofexperiments.ThenextgenerationInternetProtocol(IPv6)isbeingdeployedontestbedsandproductionnetworksthroughouttheworld.Theprotocolhasbeendesignedtosolvetodaysinternetproblems,andmanyofthefeatureswillbecoreInternetservicesinthefuture.Inthistalkthefeaturesoftheprotocolwillbedescribed.DetailswillbegivenonthedeploymentatsitesimportanttoHighEnergyPhysicsResearchandthenetworkservicesoperatingatthesesites,InparticularIPv6deploymentontheU.S.EnergySciencesNetwork(ESnet)willbereviewed.TheconnectivityandperformancebetweenHighEnergyPhysicsLaboratories,UniversitiesandInstituteswillbediscussed.

简介：嵌段共聚物聚苯乙烯-b-聚氧化乙烯（PS-b-PEO）甲苯溶液在室温下陈化2个月可形成中间是PEO单晶上下表面为PS具有＂三明治＂结构的方形片层,并且既能形成单层方形片层,也能形成多层方形片层.采用透射电子显微镜手段观察了这种结构在不同水含量的水/甲苯混合溶剂蒸汽诱导后形成的结构形貌.结果证明在甲苯和水蒸汽中,方形片层结构均能稳定存在,不能进行结构重构;而随着混合蒸汽中水含量的增加,单晶溶解、消失,在甲苯和水的共同作用下,可通过结构重构形成新的垂直或平行于表面的柱状相结构.

简介：Thecrystalandmolecularstructuresof[(C3H7O)2PS2]2(CCDCNo.217201)weredeterminedbymeansofX-raycrystallography.ItcrystallizedinatriclinicsystemwithspacegroupP1^-andlatticeparametersa=0.82794(3)nm,b=0.84764(2)nm,c=0.85034(3)nm,α=97.78(3)°β=110.77(3)°,γ=94.95(3)°,V=0.54701(9)nm^3,Z=1.Inthismolecule,thetwodiisopropyldithiophosphategroups,[(C3H7O)2PS2]2,whichareparalleltoeachother,arelinkedbyanS--Sbondandthereexistinversioncentersinthemolecule,Inthestructure,theP=Sbondsinthetwodithiophosphateunitsaretrans-orientedtoeachother.

简介：(-)-(5R,6S)-6-Acetoxyhexadecan-5-olide1,anaturalmosquitoattractantpheromone,wassynthesizedfromreadilyavailablealdehyde2andcyclopentanone3usingL-proline-catalyzedasymmetricaldolreactionasthekeystep.

简介：为了满足我国正在建设的白光中子源（whiteneutronsource,WNS）需求,设计了具有共性化架构的C6D6谱仪读出电子学系统。该系统基于波形数字化技术和PXIe平台,实现对γ能谱和中子飞行时间的测量。介绍了系统设计方案,详细阐述了信号调理模块、时间测量、PXIe平台及相关软件的设计与实现,并开展了系统性能测试和联调实验。测量结果表明：该系统能够正确获得测量数据,满足了白光中子源的首批实验需求。