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  • 简介:10月26日至27日,'中国重载铁路技术交流暨大秦重载铁路运营三十周年论坛'在太原举行。论坛全面总结和展示了我国铁路重载领域发展的技术成果,共同谋划了中国重载铁路发展的新方向,加强国内外同行业的技术交流与合作,推动中国重载铁路技术创新,为调整运输结构、提高铁路货运量、打好污染防治攻坚战提供技术支撑。

  • 标签: 重载铁路 学术交流
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  • 简介:China’spatentsystemwasestablishedin1984andcameintoeffectin1985.Threecomprehensiveamendmentshavebeenmadesofarandthefourthamendmentthatismorecomprehensiveisinprogress.Thisamendmentamountsto33articles,addingachapterof“ImplementationandApplicationofPatents”.Thekeypointsofamendmentaretostrengthentheprotectionofpatents,promotetheimplementationandapplicationofpatents,andincreasetheliabilityofpatentinfringement.Theimportantpointsofamendmentaretoimprovethelevelofpatentprotection,raisetheindemnificationstandard,transfertheburdenofproof,andencouragetheinventionandtilttheinterestsofthepatenteeorinventor.TheseamendmentswillfurtherpromotetheimprovementandperfectionofChina’spatentsystemandfurtherpromotethecivilizationandprogressofChina’ssociety.

  • 标签: PATENT LAW AMENDMENT KEY POINTS important
  • 简介:摘要现代工程建设中,施工及运输机械受到地形地域交通限制,或在施工过程中,造成工区附近居民出入不便,产生了钢便桥的需求。钢便桥有钢结构形式的框架桥和桁架形式的贝雷桥,具备临时架设所需要的效率以及足够的承载力,在工程中被广泛使用,本人结合实际建设工程中的案例对重载钢便桥设计、计算进行探讨。

  • 标签: 钢便桥 设计 重载 计算
  • 简介:Recently,ithasbeenseenthattheensembleclassifierisaneffectivewaytoenhancethepredictionperformance.However,itusuallysuffersfromtheproblemofhowtoconstructanappropriateclassifierbasedonasetofcomplexdata,forexample,thedatawithmanydimensionsorhierarchicalattributes.Thisstudyproposesamethodtoconstructeanensembleclassifierbasedonthekeyattributes.Inadditiontoitshigh-performanceonprecisionsharedbycommonensembleclassifiers,thecalculationresultsarehighlyintelligibleandthuseasyforunderstanding.Furthermore,theexperimentalresultsbasedontherealdatacollectedfromChinaMobileshowthatthekey-attributes-basedensembleclassifierhasthegoodperformanceonbothoftheclassifierconstructionandthecustomerchurnprediction.

  • 标签: CUSTOMER churn data mining ENSEMBLE CLASSIFIER
  • 简介:通过考查函数零点,既可以综合考查函数的图象与性质,又可以考查等价转化和数形结合的数学思想,所以这类问题往往用在小题“压轴”上.热点追踪表明,一个函数已“不够难”了,两个函数“套”起来!

  • 标签: 函数 图象 反复 综合考查 数学思想 数形结合
  • 简介:摘要本文介绍了40t轴重矿石车侧墙组成的侧板平面度超差的原因,通过原因分析,从工装、下料、制造工艺等方面制定了侧墙组成制造过程中侧板变形的工艺措施,保证了该车侧墙的制造质量。

  • 标签: 40t轴重 侧墙 侧板变形 控制措施
  • 简介:摘要铁路路基是铁路的基础,由于重载铁路轴重重量和速度的增加都会加重路基的病害,重载铁路路基病害对既有线的正常和安全运营形成了巨大威胁。铁路路基承受着铁路轨道和列车的荷载,随着铁路运量的增加,轴重的增大,运行速度的提高,列车动力荷载对路基的影响增大,导致路基出现的病害日趋增多。路基病害已经发展成为一种多发性、分布广、治理难的病害,严重影响了铁路运输能力,制约重载铁路的发展。为了确保重载铁路运输的高效和安全,防治铁路路基病害,必须要有针对性的实施相应的防治措施。如何有效的对重载铁路路基的病害进行分析和评估,从而确保铁路高效、安全、经济的运营是当前积急需解决的问题。本文着重分析重载铁路路基最常见的路基下沉病害及引发原因,并提出了重载铁路路基病害综合整治施工方案。

  • 标签: 铁路 路基 病害
  • 简介:Toaddressthephenomenonofsparkingduringtheedgeinductionheatingprocessinhotstripmills,thispaperusesnumericalsimulationtosystematicallyinvestigatethekeyfactorsinfluencingsparkingandtheireffects.Thedistributionofinducedcurrentdensityinthesteelplateaboverollerconveyortableduringtheheatingprocessiscalculatedandcomparedunderdifferentconditions,includingtherelativepositionsofthesteelplateandinductioncoil,thewidthofthesteelplate,andchangesinload.Theresultsshowthatwhenanarrowsteelplateisheatedorthesteelplateshiftstothesideoftheinductioncoil,sparkingbetweenthesteelplateandrollerconveyorismorelikelytooccur.

  • 标签: INDUCTION HEATING steel PLATE sparking
  • 简介:Certificatelessencryptionattractsalotofattentionsofarbyeliminatingthekeyescrowprobleminidentity-basedencryptionandpublickeycertificatesinthetraditionalpublickeycryptography.Byconsideringthethreatfromthekeyexposure,itisdesirabletoincorporatetheideaofkey-insulatedcryptosystemintothecertificatelessencryption.Inthispaper,wehavedesignedanefficientcertificatelesskeyinsulatedencryption(CL-KIE)schemetoachievethisgoal.Byourapproach,thecomputationalperformanceofourschemehasbeenimprovedsignificantlyintermsofreductiononrunningtimeandstorage.WealsogavethesecurityproofofthenewCL-KIEschemeagainstthechosenplaintextattacks(CPAs)intherandomoracle,consideringtheassumptionofthecomputationalDiffie-Hellman(CDH)problem.

  • 标签: CERTIFICATELESS cryptography keyinsulated pairing-free random oracle
  • 简介:Nowadays,thepassword-basedremoteuserauthenticationmechanismusingsmartcardisoneofthesimplestandconvenientauthenticationwaystoensuresecurecommunicationsoverthepublicnetworkenvironments.Recently,Liuetal.proposedanefficientandsecuresmartcardbasedpasswordauthenticationscheme.However,wefindthatLiuetal.’sschemeisvulnerabletotheoff-linepasswordguessingattackanduserimpersonationattack.Furthermore,italsocannotprovideuseranonymity.Inthispaper,wecryptanalyzeLiuetal.’sschemeandproposeasecurityenhanceduserauthenticationschemetoovercometheaforementionedproblems.Especially,inordertopreservetheuseranonymityandpreventtheguessingattack,weusethedynamicidentitytechnique.Theanalysisshowsthattheproposedschemeismoresecureandefficientthanotherrelatedauthenticationschemes.

  • 标签: AUTHENTICATION OFF-LINE PASSWORD guessing ATTACK smart