简介:摘要:50钢车轴是铁路货车运行的关键大部件,运行寿命期25年,直接关系到铁路运行速度和铁路行车安全。生产工艺流程复杂,技术条件要求高,工序过程控制严格,本文针对车轴锻造相关工序的生产工艺进行深入探讨,旨在提升50钢车轴的锻造质量,保证行车安全。
简介:【摘要】 高速公路某大桥采用50m钢混组合梁跨越G214道路,结构型式为四梁式工字形钢梁-混凝土组合梁。本文重点介绍了钢梁现场施工准备、临时支架拼装、现场吊装和焊接及检验、安装支座及落梁、防腐施工及临时支架拆除等工序,为大跨径钢混组合梁施工提供参考方案。
简介:DNAsequencescanbetreatedasfinite-lengthsymbolstringsoverafour-letteralphabet(A,C,T,G).Asauniversalandcomputablecomplexitymeasure,LZcomplexityisvalidtodescribethecomplexityofDNAsequences.Inthisstudy,aconceptofconditionalLZcomplexitybetweentwosequencesisproposedaccordingtotheprincipleofLZcomplexitymeasure.AnLZcomplexitydistancemetricbetweentwononnullsequencesisdefinedbyutilizingconditionalLZcomplexity.BasedonLZcomplexitydistance,aphylogenetictreeof26speciesofplacentalmammals(Eutheria)withthreeoutgroupspecieswasreconstructedfromtheircompletemitochondrialgenomes.Onthedebatethatwhichtwoofthethreemaingroupsofplacentalmammals,namelyPrimates,Ferungulates,andRodents,aremorecloselyrelated,thephylogenetictreereconstructedbasedonLZcomplexitydistancesupportsthesuggestionthatPrimatesandFerungulatesaremorecloselyrelated.