简介:Anoveltri-branchedcopolymerissynthesizedtoshowstrongtwo-photonabsorptionandintensetwo-photonabsorptioninducedfluorescenceemissionundertheexcitationofthefemtosecondlaserpulsesatwavelengthof80Ohm.Thedynamicsoftheexcitedstatewasmeasuredbythepump-probetechnique.Inaone-colourpump-probeexperimentat800nm,therewasanultrafasttransientabsorption,followedbyothertworelaxationprocesses.Thetwo-photonabsorptionprocesscouldbeoneoriginforthisultrafastphotoabsorptionsignal,whichwasfurtherprovenbytwo-colourpump-probeexperiments.Theothertwodecayingprocessesinthetransientabsorptiondynamicshavelifetimeofabout15psand129ps,whichreflecttheintrabandvibrationalrelaxationandthedecayoftwo-photonexcitedstate,respectively.
简介:Verticalaxiswindturbines(VAWTs)areadvantageousforthedevelopmentoflarge-scaleoffshorewindpowerbecausethedrivesystemislocatedatthebottomoftheturbine.Thisstudyinvestigatesthestructuralstrengthofatri-floaterfloatingfoundationsupportinga2.6MWDarrieusVAWT.Finiteelementmodelsofthefloatingfoundationweredevelopedusingspaceplate-beamelements.Theenvironmentalloads,suchastheaerodynamicloads,staticwindloads,andwave-currentloads,wereconsidered.Thegeneralstrengthsofthefloatingfoundationwerecalculatedforthenormaloperatingcase(acut-outwindspeedof25ms^(-1)andbladerotationof12rmin^(-1)wereusedtoanalyzethemostunfavorableloads)andanextremecase(windspeedof40ms^(-1)andparkedblades),andtheweakcomponentsofthestructurewereanalyzed.Theresultsshowthatthefloatingfoundationmeetsthestrengthrequirementsandthestructuralstressishighestwhenthewave,wind,andcurrentareinacollineardirection.Themainandsecondarysupportingbarstransmittheloadsbetweenthestandcolumnsandthetowerfoundation,andtheirstressesarehigherthanthoseintheothercomponents.Intheactualdesign,thesesupportingbarsshouldbestrengthened.Theaerodynamicloadsareveryimportantandshouldbeconsideredinthestructuralstrengthanalysisofthefloatingfoundationandthefloatingwindturbinesystem.
简介:The’tri-goldprogram’aimingatimprovinginformationexchangeforChina’snationaleconomyhasbeenputintopractice.The’Goldbridge’projectformstheinfrastructurefortheinformationexchangeofthenationaleconomy.Itmakesgreatcontributionstothecontrolanddecision-makingofthecountry’smacro-economy,tothepromotionofsocialproductivity,andtorelievingthebottleneckpressureonthepartsofenergy,communicationsandenvironment.The’GoldCustoms’projectaimsatrealizingpaperlessforeigntrade.The’Goldcard’projectinvolvesmodernpaymentmeans,suchaselectronic
简介:在不同活动用户dailylife的电话放置的差异增加由使用手机加速表数据认出人的活动的困难。解决这个问题,认出基于的人的活动的一个压缩察觉到的方法压缩了察觉到理论并且利用两个未加工的手机加速表数据和电话放置信息被建议。首先,一个在完全上的字典矩阵用用电话放置信息标记的足够的未加工的tri轴加速数据被构造。然后,稀少的系数为需要被解决L1最小化测试的样品被评估。最后,剩余价值被计算,最小的价值作为指示物被选择获得识别结果。试验性的结果证明这个方法能完成到达89.86%的识别精确性,它比不为识别过程采用电话放置信息的一个识别方法的高。建议方法的识别精确性有效、令人满意。
简介:Tri—Training是半监督协同训练的代表性算法之一,它运用统计技术标记置信度,并结合噪音学习理论进行无标记样本分类。当扩充样本训练集不满足噪音学习理论时,会进行随机采样,针对传统Tri-Training算法随机选取基础分类器的扩充训练样本集会引入噪声这一缺陷,通过更改扩充样本训练集选取方式,剔除可能提高分类误差的样本。在健康大数据集上进行一系列验证试验,实验结果表明,改进的算法优于原始算法,降低分类错误率。
简介:Thechaindynamicsofapairofdiblockpoly(styrene-b-butadiene)(PS210-b-PB960)andtriblockpoly(styrene-b-butadiene-b-styrene)(PS200-b-PB1815-b-PS200)copolymersinbothdiluteandsemidilutetoluenesolutionshasbeencomparativelystudiedbydynamiclaserlightscattering.Asexpected,themutualdiffusionofindividualchainchangesintoafastcooperativediffusionofthechainsegments('blobs')betweentwoneighboringentanglementpointsforboththecopolymersasthesolutionchangesfromdilutetosemidilute.Furtherincreasesoftheconcentrationleadtoasecondslowrelaxationmode.Forthetriblockchains,thereexistsanadditionalmiddlerelaxationbetweenthefastandtheslowmodes.with0.33<α<0.44,muchsmallerthan0.75predictedor0.72observedforlinearhomopolymerchainsingoodsolvent.ItimpliesthatthesolventqualityoftolueneforPBmightnotbeasgoodasthatforPS.Duetosuchadifferenceinsolubility,itisreasonabletospeculatethatthePBandPSblocksaretransientlysegregatedinsemidilutesolution.TherelaxationofthesetransientPBandPSricherdomainsleadstotheobservedslowrelaxation.Suchaspeculationissupportedbytheappearanceofanadditionalslowrelaxationmodeinthestudyofpolyisoprene-b-polystyrene-b-polyisopreneinsemidilutesolutionincyclohexane,anon-selectivesolvent,inwhichwealternatedthesolubilitydifferencebyavariationofthesolutiontemperature.
简介:Threenewcomplexes[Ni(H2L)][Fe(CN)5(NO)]2·6H2O(1),[Ni(H2L)][Fe(CN)5(NO)]2·4H2O(2)and[Cu(H2L)][Fe-(CN)5(NO)]2·4H2O(3)(L=3,10-bis(2-aminoethyl)-1,3,5,8,10,12-hexaazacyotetradecane)arepreparedandcharacter-izedbyIR,elementalanalysesandsingle-crystalX-rayanaly-ses,indicatingthattheyarethefirstexamplesoftrinurlearni-troprnsside-bridgedMFe2(M=CuandHi)complexes.Inthethreecomplexes,thecentralmetalatoms(M)areallsix-coor-dinatedbythenitrogenatomsfromthemacroeyclicligandandtwocyano-bridgesatthetrans-positionstoformdistortedocta-hedralconfigurations.TheaxialN—M—NlinkageisnearlyverticaltotheequatorialplanedefinedbyfourcoordinatingNatomsofmcroeyclicligand.TheC≡N—Nibondangleof172.6°incompleox1isapparentlylargerthanthoseincom-plexes2and3(152.57°and136.37°,respectively).Thethreecomplexesareallconnectedbyhydrogenbondsinto3Dnet-works.Thisstudyshowsthatthecyano-bridgedtrinuclearspeciescouldbegeneratedviathecontrolofthechargeofthebuildingblocks.
简介:【摘要】:目的:探讨青壮年髋关节骨性关节炎行( Tri-Lock)短柄髋关节置换术的方法的治疗效果。方法: 40例髋关节骨性关节炎患者,其中男性 29例,女性 11例,均采用后外侧入路,术中在软组织松解延长的基础上 ,重建髋关节旋转中心在真臼位置及髋关节外展功能。术后评估髋关节功能。 3、 6、 12、 24、 36个月的随访,拍骨盆正位 X线片,采用髋关节 Harris评分、 WOMAC骨关节炎指数和手术前后疼痛量表( NRS)评估关节功能。结果:术后平均随访 24.8个月( 3-36月) ,髋关节 Harris评分、 WOMAC骨关节炎指数均有明显的改善。结论:青壮年年髋关节骨性关节炎可以通过 Tri-Lock短柄全髋关节置换术,重建关节功能,获得满意的治疗效果。
简介:Forenhancingthe2.0μmbandfluorescenceofHo3+,acertainamountofWO3oxidewasintroducedintoHo3+/Tm3+/Yb3+tri-dopedtelluriteglasspreparedusingmelt-quenchingtechnique.Thepreparedtri-dopedtelluriteglasswascharacterizedbytheabsorptionspectra,fluorescenceemissionandRamanscatteringspectra,togetherwiththestimulatedabsorption,emissioncross-sectionsandgaincoefficient.TheresearchresultsshowthattheintroductionofWO3oxidecanfurtherimprovethe2.0μmbandfluorescenceemissionthroughtheenhancedphonon-assistedenergytransfersbetweenHo3+/Tm3+/Yb3+ionsundertheexcitationof980nmlaserdiode(LD).Meanwhile,themaximumgaincoefficientofHo3+at2.0μmbandreachesabout2.36cm-1.Anintense2.0μmfluorescenceemissioncanberealized.