简介:PLC(可编程序控制器)广泛地应用在冶金、机械、机器人、石油化工、电力传动、纺织机械、注塑机、包装机械、印刷机械、造纸机械、机床、自来水厂、污水处理、煤矿机械、焊接机器、榨糖机械、制烟机械、工程机械、水泥机械、玻璃机械、食品机械、灌装机械、橡胶机械、船舶、铁路、窑炉、车辆、智能建筑、电梯控制、中央空调控制、大型医疗机械、起重卷扬机械,大坝闸门,大型泵站……
简介:以前,无论是空战、海战,还是陆战,对于实力相当的作战部队来说,武器装备基本势均力敌。可是近海作战就不一样了,火力强大的舰艇吨位一般都比较大,难以到达近海,因此登陆部队只能选择橡皮艇、快艇等小型舰艇靠岸。海上隐蔽环境有限,岸边的防守部队可以在海岸线安置各种武器装备,神出鬼没地发起进攻,而登陆部队却只能依靠运输舰艇的掩护和他们手中的单兵武器反击……在地理优势和武器装备都稍逊一筹的登陆战中,如何确保近海作战的胜利呢?濒海战斗舰、特种快艇、近海支援舰……各种提升近海作战能力的舰艇出现了。其中,作为专门输送特种兵的新概念装备——M80"短剑"高速隐形快艇更是大大提高
简介:济钢对闲置的M84100/5M轧辊磨床的改造,既满足了宽厚板生产的需要,还节约了资金,同时也为轧辊磨床的改造积累了经验。
简介:Inthispaper,weanalyzeabulkinputM[X]/M/1queuewithmultipleworkingvacations.Aquasiuppertriangletransitionprobabilitymatrixoftwo-dimensionalMarkovchaininthismodelisobtained,andwiththematrixanalysismethod,highlycomplicatedprobabilitygeneratingfunction(PGF)ofthestationaryqueuelengthisfirstlyderived,fromwhichwegotthestochasticdecompositionresultforthestationaryqueuelengthwhichindicatestheevidentrelationshipwiththatoftheclassicalM[X]/M/1queuewithoutvacation.ItisimportantthatwefindtheupperandthelowerboundsofthestationarywaitingtimeintheLaplacetransformorderusingthepropertiesoftheconditionalErlangdistribution.Furthermore,wegainthemeanqueuelengthandtheupperandthelowerboundsofthemeanwaitingtime.
简介:HeteroatomM-ZSM-12zeolites(M=B,Al,Ge,Ga,Fe)arehydrothermallysynthesizedanditisprovedthattheheteroatomMisinvolvedintheframeworkofsynthesizedmolecularsievesbymeansofXRD,IRspectra.TheresultsofadsorptionanddiffusionexperimentsindicatethattheheteroatomMmodifiestheporevolume,specificsurfacearea,andthechannelofZSM-12molecularsieves.
简介:Theequilibriumgeometries,relativestabilities,andelectronicpropertiesofMnAgm(M=Na,Li;n+m≤7)aswellaspureAgn,Nan,Lin(n≤7)clustersaresystematicallyinvestigatedbymeansofthedensityfunctionaltheory.Theoptimizedgeometriesrevealthatfor2≤n≤7,therearesignificantsimilaritiesingeometryamongpureAgn,Nan,andLinclusters,andthetransitionsfromplanartothree-dimensionalconfigurationsoccuratn=7,7,and6,respectively.Incontrast,thefirstthree-dimensional(3D)structuresareobservedatn+m=5forbothNanAgmandLinAgmclusters.Whenn+m≥5,astrikingfeatureisthatthetrigonalbipyramidbecomesthemainsubunitofLinAgm.Furthermore,dramaticodd-evenalternativebehavioursareobtainedinthefragmentationenergies,secondorderdifferenceenergies,highestoccupiedandlowestunoccupiedmolecularorbitalenergygaps,andchemicalhardnessforbothpureanddopedclusters.Theanalyticresultsexhibitthatclusterswithanevenelectronicconfiguration(2,4,6)possesstheweakestchemicalreactivityandmoreenhancedstability.
简介: [影片简介] 片名/ 出品/德国谢尔兹尼克影片公司 首映/1931年6月 片长/112min 导演/弗里茨·朗(FritzLang) 主演/彼得·莱利(PeterLorre) 吉斯塔夫·葛狄斯(GustafGrundgens) 艾伦·韦德曼(EllenWidmann) 曾获奖项/所有奖项在这部影片面前不免全部黯然失色,因为这是殿堂级电影艺术大师的经典之作,也是电影学院教授津津乐道、学员必须修炼的一部影片. ……