简介:Laserbeamweldingisanewtechniqueforthefoodcanmaking.Thisresearchstudiedtheweldingtechnologyandparametersforthetin-platecanandtheirinfluencesonweldingspeedandquality,investigatedthemicrostructureandpropertiesoftheweld,analyseddistributionoftinintheweldmetalandcarriedouttheflangingtestofthecanbody.Theresultsshowthatlaserweld-ingofthecanbodyischaracterizedbyhighweldingspeed,fineappearance,goodqualityandstableandreliableprocess.Thistechnologycanfulfillthere-quirementsofcanmaking.
简介:MyparentstookmetoJapanwhenIwaslittle.Ilivedthereforfiveyears.WhenIcameback,myJapanesewasverygood.“CanIdosomething1withmyJapanese?”Iaskedmyself.Istayedathomewithnothingtodo.MyfatherbroughtmeaJapanese2.“Whydon’tyoutranslateitintoChinese?Itwillbebetterthanplayingcomputergamesallday.”Ipromisedtodo2,000wordseachday,3soonIfounditwashardto4thepromise.OnedayinMay,itwasfine.ButIcouldn’tgoout.Those2,000wordswerestill5forme.Aftertranslatingonlythreepages,Ialreadylostinterestinthebook.HowI6Icouldjustgooutsideandplayfootballwithmyfriends!Icountedthewordsagainandagain.Ijustwantedto7.Ifeltasiftwopeoplewerefighting8mymind.Onesaid,“Don’tgiveup!Keepworkinghard,andyou’lldowell!”Butthentheotheronesaid,“Goandplay!Itwillbemore9thantranslating.Doyourworktomorrow.”Istoodupandwould10thecomputer.ButthenIrememberedwhatmyparentshadtoldme:Whateveryoudo,don’tstophalfway.SoIsatdownandwentonwithit.
简介:摘要:CAN通讯具有无主特性在许多领域都得到广泛应用。但由于其网络节点多、通讯速率快等因素也容易造成通讯异常,这些问题大多与CAN网络的端接电阻相关。本文介绍了
简介:摘要:随着电子技术的发展,车载电子控制装置ECU的应用越来越多。为了实现ECU之间的通信和数据共享,根据每个电子控制系统的复杂性以及信息量和响应速度的要求,有各种车载远程网络。其中,德国Robert Bosch公司开发的控制器局域网CAN以其优越的性能在车载高速网络中得到了广泛的应用。LIN网络作为一种有望成为车载低速网络标准的网络协议,不需要CAN总线的带宽和多功能,例如智能传感器与制动装置之间的通信,具有很大的应用空间。其功能是将开关执行器和传感器从子总线连接到主总线,如CAN总线。因此,为了实现各种车载网络之间的信息通信,有必要研究不同网络之间的互联技术。
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简介:用化学方法合成随机DNA库,应用SELEX技术筛选能与苏云金芽孢杆菌(Bt)结合的DNA适配子,经过12轮的筛选后,适配子与Bt结合的亲和力达到饱和。在克隆获得的18个适配子序列中,有3个适配子具有较高的亲和力,其中多数具有典型的三茎环结构。