共查询到20条相似文献,搜索用时 15 毫秒
1.
本文主要阐述用HPLC及GC/MS分析燃煤废气中PAHs的全过程,发现其PAHs普遍高于汽车及柴油机尾气中的含量,同时利用GC/MS鉴定了69种PAHs、氮 PAHs及甲基化PAHs。 相似文献
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[1]“Microscopicrealtimeobservationoffailure ,wearanddeformationoncoating/subsurface” ,“镀层 /基体的破坏、磨损及变形的微观实时观察” ,HiroshiMishina,《Trib .Intern .》 ,1999,Vol 32 ,No 3,137~ 144。[2 ]“EffectsofexternalelectricfieldsonfrictionalbehavioursofthreekindsofCeramic/MetalrubbingCouples”… 相似文献
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焊接夹紧件结构分析及标准化设计AnalysisandStandardizationDesigntotheStructureofWeldingFixture林让贤LinRang-xian(柳州微型汽车厂柳州545007)(LiuzhouMini-bus... 相似文献
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一种在线测试对象特性的方法 总被引:1,自引:0,他引:1
王永初 《工业仪表与自动化装置》1996,(5):8-10
本文介绍一种工业对象特性Gs=Ke^-τs/(T1s+1)(Ts2+1)的微机闭环在线测试方法,可在过程控制及自校正或自适应装置中采用。 相似文献
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Profibus技术及其在烟草电控系统中的应用 总被引:2,自引:0,他引:2
本文概要介绍了现场总线的概念和Profibus技术,论述了Profibus技术在烟草制丝电控系统中的应用及设计原则,总结了系统采用Profibus技术后的特点。 相似文献
6.
基于效率函数求解的单件车间调度问题的算法 总被引:15,自引:1,他引:14
单件小批量生产形式下的单件车间(Jobshop)调度是生产计划中的一个重要问题。本文提出了一种求解Jobshop调度问题的调度算法及调解算法。经分析及实验验证,利用这种算法求解Jobshop调度问题可得到十分满意的结果。 相似文献
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意大利中部莫纳市的Passini集团,在生产履带式工程机械和农业机械行走部件领域处于世界领先地位。该集团非常重视中国市场,把开拓中国市场作为加强Passini集团国际化的一个重要战略决策。为此目的,Passini集团于1999年1月20~21日在北京召开交流会,介绍其经营活动及发展战略。Passini集团之所以对直接进入中国市场作常重视,是因为中国是一个战略性地区,中国拥有的众多的生产厂家和零部件使用者,不论是在贸易方面还是生产方面,都将为世界提供一个具有极大潜力的市场,进入这个巨大的市场,将进… 相似文献
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介绍了用 Visual Basic语言开发的成形车刀CAD/CAM系统的结构、功能及关键技术。 相似文献
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0 INTRODUCTIONThekineticprecisionoftransmissionchainisakeyproblemintheresearchofgearcuttingmachinetransmissionsystem .Thetraditionalpointofviewistoconsidertheransmissionchainonlydependsonthemanufacturingandassemblyerrorsofitstransmissionparts.Butfurthe… 相似文献
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RESEARCH ON PROCESS AND PLAN OF DISASSEMBLY 总被引:2,自引:0,他引:2
Hu Junjun Multimedia Research Division Guangdong Telecommunication Academy of Science Technology Li Chenggang Hu Yujin Cai Xueyuan Zhou Ji Huazhong University of Science Technology 《机械工程学报(英文版)》2001,(1)
0 INTRODUCTIONProductdisassemblyisabasic problemintheareaoflifecycle ,thishasbeen provenbythreeaspectsasfollowing :(1)Disassemblyfortransport Someproductmustproperlybedisassemblyforeasetotransport,suchastofitthesizeofcontainer (2 )Disassemblyforservice Disass… 相似文献
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RESEARCH OF THE DYNAMIC CHARACTERISTICS ON A NEW HYDRAULIC SYSTEM OF ELECTRO-HYDRAULIC HAMMER 总被引:7,自引:0,他引:7
Li Yongtang Lei Bufang Department of Mechanical Engineering Taiyuan Heavy Machinery Institute Shi Enxiu Xi''''an University of Science Technology 《机械工程学报(英文版)》2001,(2):171-174
0 INTRODUCTIONSteamdrivenhammersarewidelyusedinthemiddleandsmall sizedforgingplantsinourcountry They possesssuchadvantagesassimplestructure ,flexibleusageandcheap price Neverthelesstheypossessmanydisadvantagessuchasmuchlowerefficiency ,complicated powerde… 相似文献
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STUDY ON VARIATION OF SETTING AND STOPPING PRESSURES OF SAFETY VALVE WITH STRUCTURAL MODIFICATION 总被引:1,自引:0,他引:1
Lee Jinho Kwangzin Valve Industrial Co Ltd Korea Kim Harkbong Kim Moonsang School of Aerospace Mechanical Engineering Hankook Aviation University Korea 《机械工程学报(英文版)》2001,(2):127-138
0 INTRODUCTIONSafetyvalveisplayinganinevitableroleofsafetyunitfunctioninboilerandvariousother pressurevesselsandhasbeenarrangedsystematicallysoastobe permittedtomanufactureonlythroughstrictinspectionteststipulatedinrelevantorganizationsoftheIndustrial… 相似文献
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0 INTRODUCTIONOnewholecenturyagoBall[1] publishedhisclassicalwork ,inwhichhestudiedthescrewtheory .Hunt[2 ] discussedallthescrewsystems .Thedistributionofallthescrewsofascrewsysteminthree dimensionspaceisregular .Forathird orderscrewsystem ,theaxesofallthescrew… 相似文献
14.
PASSIVE-ACTIVE CONTROL OF POWER FLOW IN AN ISOLATION SYSTEM MOUNTED ON FLEXIBLE FOUNDATIONS 总被引:1,自引:0,他引:1
Huo Rui 《机械工程学报(英文版)》2001,(2):111-115
0 INTRODUCTIONMachinesattachedtostructuresgenerateunwantedvibrationsandstructure bornenoise ,thereforeisolatorsareoftenusedasavibrationcontrolmeasure .Traditionally ,vibrationisolationisperformedby passivedevicessuchassprings ,dampersorextramasses .However,… 相似文献
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FINITE ELEMENT ANALYSIS OF TRASINENT TWO-DIMENSIONAL CHANNEL FLOW WITH A SUDDEN EXPANSION 总被引:2,自引:0,他引:2
0 INTRODUCTIONInhydraulictransmissionandcontrolsystem,fluidisusedtotransportpowerorsendsignal.Whenthefluidflowsinconduit,twokindsofenergylosswillbeproduced.Oneispipefrictionenergylossduetotheviscousoffluidandtheroughnessofthepipe,anotherislocalene… 相似文献
16.
QinDatong QinDongxing State Key Lab of Mechanical Transmission Chongqing University 《机械工程学报(英文版)》1999,12(4)
0 INTRODUCTIONHourglasswormgearingisextensivelyusedforpowertransmissionwithheavyloads.Priorresearchhasfocusedonitsgeometrytoreducethesensibilityofthehourglasswormgearingtothemanufacturingerror,improvemanufacturabilityandmachiningprecision[1,2].Howeve… 相似文献
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Zhao Youqun Shandong Institute of Technology Guo Konghui Zhang Guiyu Jilin University of Technology Shandong Institute of Technology 《机械工程学报(英文版)》1999,12(4)
0 INTRODUCTIONTheroadinputmathematicalmodelisstilldeterministicuntilnowwhensteeringdynamicssimulationisstudiedfordrivervehicleclosedsystem[1].Theroadcurveshapeisrandominfact.Itisreasonableandnecessarytotreattheroadcurveshapeinputasrandomprocessinor… 相似文献
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HIGHER ORDER SPECTRAL ANALYSIS IN FAULT DIAGNOSIS OF ROTORS 总被引:3,自引:0,他引:3
Yang Jiangtian Xu Jinwu School of Mechanical Engineering Beijing University of Sicence Technology 《机械工程学报(英文版)》2001,(1):40-44
0 INTRODUCTIONFormonitoringanddiagnosingofmachinery ,signalprocessingisaimedatextractingthefeaturesfromthesensorsignalsthatdescribethecharacteristicsoftheirworkingcondition .Itshouldbepointedout,however ,thatconventionalsignalanalysismethodsareonlyavaila… 相似文献
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EUV Optical Design-Reflective and Diffractive Optics 总被引:1,自引:0,他引:1
Takeshi Namioka 《光学精密工程》2001,9(5):411-417
1 Introduction Aclientoftenaskshisdesignerfortoomuch :excessivefunctionsinoneforcostsaving ,unrealis tichighaccuracyandperformancejustforself sat isfaction ,forexample .Atthesametime ,itisalsotruethatsomeclientsprovideexcitingandchal lengingopportunitiesto… 相似文献
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Wang Shaoping Jiao Zongxia Hua Qing Institute of Automation Science Electronic Enginearing Beijing University of Aeronautics Astronautics 《机械工程学报(英文版)》2001,(1):36-39
0 INTRODUCTIONHydraulicservoloadingsystemisacomplexsystem ,whichrunsimportantrolesinhardware in loopsimulationofflightvehicleonthe ground .Becausetheloadedobjectmoveswiththeloadingsystem ,theextraneoustorquewhichisresultfromtheloadedobjectmotionandparamet… 相似文献