简介:DiffusionofAlinthinfilmnanocrystallineCu(18nm)hasbeeninvestigatedbymeansofsecondionmassspectroscopy(SIMS).Intheexperimentaltemperaturerangesfrom421to773K,thereseem-inglyexiststwodiffusionmechanisms.TheimpurityelementsOandCaresupposedtoaccumulatetothegrainboundariesandinhibitthefastgrainboundarydiffusion.
简介:Threeheterobinuclearcomplexesweresynthesized,namely[Cu(oxpn)Co(L)2](ClO4)2·xH2O(L=2,2’-bipyridyl(bpy),1,10-phenanthroline(phen),and5-nitro-1,10-phenanthroline(NO2-phen)),whereoxpnrepresentsN,N’-bis(3-aminopropyl)oxam-ido.Basedon1R,elementalanalysis,conductivitymeasurementandelectronicspectra,thesecomplexeswerecharacterizedbyanextendedoxamido-bridgedstructurewithCu(Ⅱ)inaplanarenvironmentandCo(Ⅱ)inaoctahedralenvironment.ThesymmetryofthecationisveryclosetoC2v.Thecomplexeswerealsocharacterizedwithvariabletemperature(4~300K)magneticsusceptibility,andthedatawerefitforthesusceptibilityequationderivedfromspinHamilton,H=-2JS1.S2-DSx12byleastsquarestrategy.Theexchangeintegral,J,wasfoundtobe-22.36cm-1(forbpy);-15.45cm-1(forphen);-19.10cm-1(forNO2-phen),indicatingthatthereisaweakantiferromagneticspin-exchangeinteractionbetweenthemetalions.
简介:摘要:利用金相显微镜、电子万能材料实验机对Al-Cu-Mg-Ag合金的微观组织与力学性能进行了测试。结果表明:随着时效时间的延长,合金晶界上的第二相先固溶于基体,又逐渐从基体中析出,合金的晶粒先增大后减小;合金的强度先急剧增加,后趋于平缓,塑性先减小后趋于稳定。
简介:摘要:随着网络技术的不断发展,传统的网络架构已难以满足日益复杂的业务需求。边界网络网关(BNG)作为连接用户和网络的关键设备,其性能与稳定性对于提升整体网络质量具有重要意义。本文提出了一种基于控制面与用户面分离(CU分离)的BNG架构,并对其智能运维进行了探索。首先,介绍了CU分离架构的基本原理和优势;其次,分析了基于CU分离的BNG架构的智能运维需求;接着,设计了智能运维系统的整体架构和功能模块;最后,通过实验验证了智能运维系统的有效性。实验结果表明,该智能运维系统能够有效地提升BNG的性能和稳定性,为网络的智能运维提供了新的思路和方法。
简介:Twosolubleisomerizedpolyimides(PIs)synthesizedfrom2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropanedianhydride(6FDA)witheither2,2'-dimethylbenzidine(2,2'-DMB)or3,3'-DMBwereinvestigatedbymeansofsize-exclusionchromatographycoupledwithmulti-anglelaserlightscattering,aviscometerandarefractiveindexdetectorintetrahydrofuran(THF)withtetrabutylammoniumbromide(TBAB)at35℃.Thecorrespondingparametersrelatedtoconformationsαandν,evaluatedfromthescalingrelationships[η]=KηMαandRg=KgMν,respectively,were0.66±0.01and0.55±0.02forpoly(6FDA/3,3'-DMB),and0.67±0.01and0.56±0.01forpoly(6FDA/2,2'-DMB),indicatingarandomcoilconformationforboththesamplesinthismobilesystem.ThepersistencelengthlpandshiftfactorML(relativemolecularweightperunitcontourlength)wereestimatedfromtherelationshipbetweenintrinsicviscosityandmolecularweightforthewormlikecylindermodelproposedbyBohdanecky.BothlpandMLshowedthatthetwoPIsinTHFareflexiblechainsandexhibitsomelocalrigiditytosomeextent.
简介:重要细丝状的工业真菌,Rhizopuscohnii(R。cohnii),作为有效biosorbent被使用把镉从废水移开。吸着条件生物资源的剂量和镉的起始的集中例如pH,被检验。二种吸附模型被使用模仿biosorption数据。镉的举起比处于强壮的酸状况处于弱酸状况是更高的。当pH价值比2.0低时,将近,镉的吸着都没发生。Biosorption等温的数据能被兰米尔和Freundlich模型很好模仿。biosorption的兰米尔模拟证明镉的最大的举起处于最佳的条件是40.5mg/g(0.36mmol/g),它比许多另外的吸附物高,包括biosorbents并且激活碳。另外,可重用性结果在五次吸着和解吸附作用过程以后显示出那,R的吸着能力。cohnii能仍然维持将近80%,证实它在镉处理的实际申请。Fourier变换红外线的光谱揭示了那carboxyl,氨基并且biosorbentR上的氢氧根组。cohnii表面为镉的biosorption负责。
简介:SECRALIIisthesecondfullysuperconductingECRionsourcedevelopedatIMP.It’salmosttheduplicateofSECRAL,exceptforthecryogenicsystem[1].SECRALIIhasintegratedLHerecondensationsystem,whichhasthedynamiccoolingcapacityofmorethan5W.ThemainparametersofSECRALI&IIareshowninTable1.ThemagnetsofSECRALIIhasbeensuccessfullyfabricatedandtestedin2015.In2016,SECRALIIhasbeencommissionedat18and28GHzwithOandXeionbeams,whichhasgivenverypromisingresults.