简介:摘要:学校宿舍区供水,主要包含生活用水和消防用水两大类,采用高位水箱以及气压罐供水方式,这样不仅会造成水资源和电资源的浪费,而且系统频繁的开启,也会对电器设备的使用寿命等造成一定的损害。本文以自来水水压供水与水泵提水相结合的方式,并配以变频器、软启动器、PLC、压力传感器、液位传感器等不同功能等传感器,根据管网的压力,通过变频器控制水泵的转速,使管路中的压力始终保持在合适的范围。并且着重在电路控制的流程与原理加以分析,结合使用可编程控制器,可实现主泵变频,副泵软启动,具有短路保护、过流保护功能,工作稳定可靠,大大延长了电机的使用寿命。
简介:CO2emissionofthesteelindustrytakesupagreatproportionofthetotalemissionoftheworld.ItisnecessarytoreducetheCO2intensityofsteelproductsinordertosaveenergy,protecttheenvironmentandkeepasustainabledevelopmentinthesteelindustry.Basedontheresearchofsteelproducts'lifecycleinventory,thosewhoconductedthisresearchhavefocusedontheanalysisofCO2emissionfactorsandmeasures.Adoptingthelifecycleinventorymodelofacertainsteelmakingsite,togetherwiththeTornadoChart,theresearchershaveidentifiedsignificantfactors,providedsomeexplanation,andsuggestedsomepossiblemeasurestoreduceCO2emission.TheresultshaveshownthatthemostimportantfactorsaretheCO2intensityofblastfurnacegas(BFG),hotmetalratioofbasicoxygenfurnace(BOF)andthematerialutilizationefficiency.Accordingly,somemeasuressuchasremovingCO2inBFG,decreasingthehotmetalproportioninBOF,andimprovematerialutilizationefficiencyineachprocess,maybetakentodecreaseCO2emission.
简介:本课是一节高中英语阅读课,话题为广告。教师以学生最喜欢的广告导入话题,激起学生的学习热情,进而通过对比几组不同风格的广告,引起学生思考——Howadvertisingworks?教师通过对文本不同层次的处理,扎实有效地培养学生阅读的predicting,skimming,scanning,paraphrasingandinferring等技能。
简介:Topunistouseawordorwordstogettwomeanings,literalmeaningandconnotationmeaningtoachievehumorousorsarcasticsense.Itisawidely-usedfigureofspeechinbothEnglishlanguageandChineselanguage,especiallyintheliteraryworks.Theuseofpunmakesliteraryworksnotonlyvividbutalsohumorousandsarcastic.Inordertobetterrepresenttheartisticbeautyofpuninliteraryworks,theauthorwillexplorethetranslationmethodsofpuninthispaper.
简介:BaotouMotorWorksisastate-runmotorpro-ducerinChina.TheinventionofNd-Fe-Bperma-nentmagnethashelpedtheplantsuccessfullydevel-opZYNseriesdcmotorswhichpossesstheadvan-tagesofreducedvolume,lightweightandhigheffi-ciency.Since1991,thedcmotorhasbeenexten-sivelyappliedtometallurgicalmachinestotaketheplaceofthetraditionalZ3seriesmotors.
简介:ThomasHardy'scharactersinTheReturnoftheNativeliveinaworldgovernedbyaharshandindifferentironicGod.Hardyseesthereigningpoweroftheuniverseasbeingessentiallyunjustandmorallyblind,Hardy'spowerfulchancedeniesMrs.YeobrightandClymareunion,Hardyistellingatruthtoreaders
简介:在世纪的功课上,河系统重重地为水,沉积和冰的安全分泌物的目的被训练了,并且改进航行。传统地,堤是被增强并且提高了更高保护国家免受以前的伤害洪水层次。其它比技术工程答案答案打字,例如增加洪水运输能力的措施(例如,丁提和泛滥平原阴沉,阻碍堤)变得更流行。这些答案可以然而增加河床动力学并且因此否定地影响航行,维护挖出和洪水安全。许多数字模型是可得到的在河过程上预言河恢复工作的影响。经常,很少注意都没对对无常的评价被给予。在这篇论文,我们显示出我们怎么能用一条随机的途径使无常明确。这条途径帮助识别无常来源并且在河过程估计他们的贡献到全面无常。途径给工程师系统行为的更好的理解并且使他们能与河系统干涉,以便避免不希望得到的状况。我们为在荷兰在来因河优化低地河恢复工作说明这条随机的途径的优点。
简介:InJanuary2001,theStatePowerCorporation(SP)printedanddistributedtheannualmainpointsofworksoftheyear2001,puttingforward,withdevelopmentastopicalsubject,withrestructuringasprincipalline,tovigorouslypromote’sendingpowerfromwesttoeast’andnationwideinterconnectiono
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简介:Thestate-ownedQunfengMachineryWorksisaspecializedfactoryundertheMinistryofAviationandSpaceIndustrymanufacturinglinemantools.Takingfulladvantagesofthesuperiorityoftechnicalforcesandfacilitiesexistedinthisindustry,overonehunderdkindsoflinemantoolsincludinghot-linetoolsmadeofhighstrengthaluminumalloyforhighvoltagetransmissionlinesupto500kVhavebeenmanufacturedsince1979.Someofthefoolswillbeintroducedinsuccessiveisuesinthis