简介：ULTRAFunctionEnterpriseCompanyLimited(UFECL)isaSino-foreignjointventurewhichpro-ducesthecompoundsofREwithhighpurityinChina.Itpossessesadvancedinternationalseparationtechnol-ogyofrareearthandanalytical-testinginstrument.

简介：

简介：

简介：

简介：

简介：

简介：Ultra-steelProjectperformedatNationalInstituteforMaterialsScience(NIMS)1997-2005proposed'Breakthroughsforinnovationbysteelscience'.Themainconceptswerecomposedofdecreasingtheenvironmentalload,noorlessspecialalloyingelementsandsaferinfrastructurewithreducedthetotallifecost.Four'doublestrengthanddoublelife'steelsweredevelopedasfollows:①800MPa-classecologicallybeneficialsteelsforweldedstructures,②1500MPasteelswithhighresistancetofracture,③advancedferriticsteelsfor650C-USCboilersand④Ultra-steelsforstructuresinmarineandoffshoreenvironments.Worldsteelsocietyisstillgrowingwiththreateninglimitsofresourcesandenergy.Applicationoftheultra-steelideaswouldbeincreasinglyhelpfulfortheglobalsustainability.ThetalkwillintroducetherecentprogressinsteelresearchatNIMS,basedontheprojectaccomplishments.

简介：Radiationsimulationutilizingplasmaradiationsources(PRS)generatesalargenumberofundesirabledebris,whichmaydamagetheexpensivediagnosingdetectors.Anultrafastshutter(UFS)drivenbypulsedhighcurrentcanerectaphysicalbarriertotheslowlymovingdebrisafterallowingthepassageofX-rayphotons.TheUFSconsistsofapairofthinmetalfoilstwistingtheparallelaxesinaNyloncassette,compressedwithanoutermagneticfield,generatedfromafastcapacitorbank,dischargingintoasingleturnloop.Atypicalcapacitorbankisof7.5μFchargingvoltagesvaryingfrom30kVto45kV,withcorrespondingcurrentsofapproximately90kAto140kAanddischargingcurrentperiodsofapproximately13.1μs.Ashutterclosingtimeasfastas38microsecondshasbeenobtainedwithanaluminiumfoilthicknessof100micrometersandacross-sectionalareaof15mmby20mm.Thedesign,constructionandtheexpressionsofthevalve-closingtimeoftheUFSarepresentedalongwiththemeasuredresultsofvalve-closingvelocities.

简介：极端宽带(UWB)要求的高速度的高分辨率的analog-to-digital(A/D)变换信号处理是一个很挑战性的问题。这份报纸为UWB信号获得建议一个平行随机的设计方法。建议方法能完成高采样率，高决定和硬件实现的技术可行性。在建议方法，一个模拟UWB信号在一套随机的符号函数上被投射。然后，低率的高分辨率的analog-to-digital变流器(模数转换器)被用来取样设计系数。信号能被简单线性计算与采样矩阵重建，没有遵循优化算法和优先的知识。在另外的方面，不同其它走近那需要在极其高的频率利用精确时间移动，或设计一个混合过滤器银行，或与优先的知识为信号产生特定的基础功能或工作，建议方法是一条通用采样途径并且对容易适用。到噪音比率(SNR)和假免费的动态范围(SFDR)的信号的模拟结果为UWB信号获得验证建议方法的效率。

简介：Thefatiguelifeofnumerousaerospace,locomotive,automotiveandbiomedicalstructuresmaygobeyond10~8cycles.Determinationoflonglifefatiguebehaviorbecomesextremelyimportantforbetterunderstandinganddesignofthecomponentsandstructures.Initially,beforetheinventionofultrasonicfatiguetesting,mostoftheengineeringmaterialsweresupposedtoexhibitfatiguelifeupto10~7cyclesorless.Thispaperreviewscurrentunderstandingofsomefundamentalaspectsonthedevelopmentofacceleratedfatiguetestingmethodanditsapplicationinultra-highcyclefatigue,crackinitiationandgrowthmechanismsofinternalfracture,S-Ndiagram,fatiguelimitandlifeprediction,etc.

简介：近日，立维腾推出创新的Opt-XUltra^TM系列机架式高密度光纤配线箱。Opt-XUltra^TM系列拥有时尚外观和用户友好界面、将机架式光纤配线箱提升到了一个全新的水平。Opt-XUltra^TM由彩色聚碳酸酯（俗称防弹胶）和第16#粉末涂层钢构成，美观耐用，是企业和数据中心的理想选择。配线箱有1RU、2RU和4RU三种规格，

简介：Anewultra-wide-band(UWB)hornantennabasedonthenonradiativedielectricwaveguide(NRD-guide)wasproposedtosolvetheproblemofUWBantennas,TEMhornsforexample,generallysufferfromlargesideleakage.Theruleofthetheoreticalselectionofitsparameters,ifNRD-guideisusedastheUWBantennas,isstudiedfirstly,thentheradiationcharacteristicsforanopen-endedNRD-guidearecalculatedbyFDTD(finite-differencetime-domain)method.

简介：Ultrafastcoolingisanewtechnologywhichusedtocontrolthehot-rollingstripcoolinginrecentyearsontheinternationaldeveloped.Ifsuitablycooperatedwithanumberofothernewcontrolledrollingtechnologies,canachievefastandaccuratetemperaturecontrolinthehot-rolledstripproductionprocesstoobtaincorrespondingtransformationmicrostructureandidealmechanicalproperties.Thisarticledescribesthetechnicalprincipleandlayoutofultrafastcoolinginhot-rolledaswellasapplicationprofilesinthemajorironandsteelenterpriseinChinaandabroad.Carriedoutthelayoutofultrafastcoolinganalysisontheadaptabilityofsteelthatinstallbetweenthefinishingmillandlaminarcooling,onthisbasis,proposedtheuseofultrafastcoolingtechnologyproposals.

简介：Inthispaper,spatiallyangularmultiplexingtechniqueinpulseddigitalholographyandanopticalsystembasedonthistechniqueareintroduced.Opticalsimulationandcalculatinganalysisshowthatthedesignedsystemcanbeemployedtorecordultra-fasteventsofatimeresolutioninnanosecond.

简介：

简介：

简介：1.导言有机金属（OM）是导电聚合体的一种先进的形式,虽然呈有机化合物的特征,但是具有金属的属性;此材料由碳、氢、氮、氧以及硫酸盐组成,经过人工合成并以10纳米大小的原始颗粒进行水溶性分散【1】。多年前的研究就发现该材料能非常有效地防止铜的氧化【2】。10多年来,此材料作为电路板表面处理沉锡制程ORMECON?CSN的预浸被商业应用。在该制程中,有机金属在沉锡前

简介：在最近的一两年中，只要谈到显卡改造就能想到ATi显卡。除了较早的Radeon9500改造成Radeon9700以外，近期的Radeon9800SE改造成Radeon9800XT同样也掀起了一股热潮。相对而言，nVidia的显卡改造就相形见绌了，除了能把低端的GeForce改造成高端的Quadro以外，似乎并没有太多的热点。

简介：

简介：EFD新推出的Ultra^TM2400系列点胶机，适用于各种工业流体，包括从稀薄的水性溶剂到粘稠硅胶和膏体状的树脂。全新的设计为市场提供了功能更全、控制能力更强的点胶系统。2400尽量减少占用工作台面积，为操作工释放更多工作空间；拥有独特的气压控制体系和高速电磁阀系统，能够完成精确、一致的点胶控制。机身上还可根据您的应用需求安装工作灯、手感舒适的手持点胶器和柔性的针筒支架等多种实用的配件。主要特性：