简介：Radiationsimulationutilizingplasmaradiationsources(PRS)generatesalargenumberofundesirabledebris,whichmaydamagetheexpensivediagnosingdetectors.Anultrafastshutter(UFS)drivenbypulsedhighcurrentcanerectaphysicalbarriertotheslowlymovingdebrisafterallowingthepassageofX-rayphotons.TheUFSconsistsofapairofthinmetalfoilstwistingtheparallelaxesinaNyloncassette,compressedwithanoutermagneticfield,generatedfromafastcapacitorbank,dischargingintoasingleturnloop.Atypicalcapacitorbankisof7.5μFchargingvoltagesvaryingfrom30kVto45kV,withcorrespondingcurrentsofapproximately90kAto140kAanddischargingcurrentperiodsofapproximately13.1μs.Ashutterclosingtimeasfastas38microsecondshasbeenobtainedwithanaluminiumfoilthicknessof100micrometersandacross-sectionalareaof15mmby20mm.Thedesign,constructionandtheexpressionsofthevalve-closingtimeoftheUFSarepresentedalongwiththemeasuredresultsofvalve-closingvelocities.

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简介：Theinfluenceofcircularapertureontheintensityofhigh-orderharmonicgeneration(HHG)withintensefemtosecondlaserpulsewasstudiedbothexperimentallyandtheoretically.TheintensityvarietyofHHGwiththediameterofcircularaperturewasobservedinpulsedArgas.TheresultwasdiscussedandinterpretedintermsofthetheoryofHankeltransform.ItisfoundthatusingtheGaussianbeamtruncatedbyanaperturecouldenhancetheconversionefficiencyofHHGatcertainconditions.

简介：Forthepurposeofachievinghigh-resolutionoptimalsolutionsthispaperproposesanodaldesignvariablebasedadaptivemethodfortopologyoptimizationofcontinuumstructures.Theanalysismesh-independentdensityfield,interpolatedbythenodaldesignvariablesatagivensetofdensitypoints,isadaptivelyrefined/coarsenedaccordingtoacriterionregardingthegray-scalemeasureoflocalregions.Newdensitypointsareaddedintothegrayregionsandredundantonesareremovedfromtheregionsoccupiedbypurelysolid/voidphasesfordecreasingthenumberofdesignvariables.Apenalizationfactoradaptivitytechniqueisemployedtopreventprematureconvergenceoftheoptimizationiterations.Suchanadaptiveschemenotonlyimprovesthestructuralboundarydescriptionquality,butalsoallowsforsufficientfurthertopologicalevolutionofthestructurallayoutinhigheradaptivitylevelsandthusessentiallyenableshigh-resolutionsolutions.Moreover,comparedwiththecasewithuniformlyandfinelydistributeddensitypoints,theproposedadaptivemethodcanachieveahighernumericalefficiencyoftheoptimizationprocess.

简介：Inthispaper,wepresentahighspeedautofocussystemformicrosystemapplicationsanddesignalook-up-tablebasedautofocusingalgorithmforapplicationswhenatargetobjectisalwaysvisible,e.g.,manufacturingpartswithalignmentfiducials.Weperformanevaluationof24focusmeasurestoverifythatwhichfocusmeasureisthebestforthelook-up-tablebasedmethod.Fromtheevaluation,wefindthattheChebyshevmoments-basedfocusmeasure(CHEB)isthemostsuitable.Furthermore,wealsodevelopalook-up-tablebasedautofocussystemthatusesCHEBasthefocusmeasure.Intrainingphase,weofflineconstructatablefromtrainingimagesofanobjectthatarecapturedatseverallensdistances.Eachentryoftableconsistsoffocusmeasurecomputedfromimageandlensdistance.Inworkingphase,givenaninputimage,thealgorithmfirstcomputesthefocusmeasureandthenfindsthebestmatchfocusmeasurefromthetableandlooksupthecorrespondinglenspositionformovingitintothein-focusposition.Ouralgorithmcanperformautofocusingwithinonly2stepsoflensmoving.Theexperimentshowsthatthesystemcanperformhighspeedautofocusingofmicroobjects.

简介：坚持跑步不是简单的一件事，除了自己的坚强毅力，还得有坚持下去的乐趣。那有什么可以提升我们坚持的兴趣呢？一款陪跑神器“跑嗨乐”迅速受到跑步爱好者的喜爱，让跑步越来越high。

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简介：Wearofthespenthighchromebrickinslagginggasifierwasstudied.TheresultshowsthaterosionandspallingarethemainwearmechanismofhighchromebrickandtheCaOcontentofcoalslagiscrucialtowearofhighchromebrick.

简介：压缩力量，氯化物穿入抵抗和二高效的水泥的微观结构不到三被检验治好条件。治好的条件包括治好的标准(SC)，治好匹配(MC，哪个工具在温度治好的封上的具体标本控制了盒子)并且根据温度的发展法律裸体水泥(NMC)治好匹配在地点上在集体水泥测量了。结果显示在MC和NMC下面的水泥在SC下面比那显示出更高的抵抗到氯化物穿入。在MC下面的水泥在NMC下面比那些有稍微更低的氯化物穿入，但是在NMC下面的标本的压缩力量比在在56d的MC下面的那高。另外，在NMC和MC下面具体比在SC下面有更高早的力量，特别在早年龄。然而，治好在248白天影响水泥的压缩力量的条件的顺序是：SC>NMC>MC。

简介：Fromseveralmodelsaboutdamagemechanis,thedamagemecanismofopticalfilmsandthefactorswhichaffectthedamagethresholdaredescribedexperi-mentallyandtheoretically.Somereasonableproposalsaregivenisthispaperonhowtoselectthehigh-thresholdfimls.

简介：C~3(俗称Highc)这个高音在声乐演唱技巧中,被所有的高音歌唱家视为畏途。这对于男高音歌手来说,比女高音更为艰难,因为这个音对于男高音歌手来说,属于“非自然的嗓音”。它既要达到那种高度,又要保持低音域所具有的力度和雄浑,同时还要使发声技巧服从于艺术要求,这实在是一种难能可贵而令人兴奋的成就。

简介：Ananomeshhasbeendevelopedthatnearlytriplessolarcellefficiency.Theresearchteammanagedtoreducethereflectivityofthematerialsused,effectivelyincreasingtheamountofcapturedlight.Inadditiontothis,thenewsolarcellsarealsomuchthinnerthancurrentonesonthemarket.Thestructureiscreatedbysandwichingmetalwithnanomeshandisbeingcalled'PlasomnicCavity

简介：NanostructuredtitaniahavebeenintensivelyinvestigatedasanodematerialsofLi-ionbatteriesfortheirexcellenthighrateperformance.ThesizeeffectsofTiO2polymorphs(mainlyrutile,anataseandTiO2-B)ontheirelectrochemicalperformanceandthelatesteffortsinnanoengineeringtitaniaanodesthroughenhancingtheirionicorelectronictransportationorbotharereviewedinthiswork.Wesupposethatmicron-orsubmicronsizedporousstructuresassembledbyTiO2nanoparticles,nanowires/nanotubesornanosheetswithahighpercentageofexposinghighreactivefacetstogetherwithaconductivepercolatingnetworkareidealanodesnotonlyforhighratelithiumstoragebutalsoforhighpackingdensitiesoftheactivematerials.

简介：Thepotentialapplicationsofsomehightenologiesinrefractories,suchas,nanotechnology,in-situsynthesis,self-propagatinghigh-temperaturesynthesis,functionalgradientmaterials,computerassisteddesignandsomenewadvancedrefactoriesinSi-Al-O-Nsystemarebrieflydescribed.Thecharacteristicsandpreparationprocessesofthesenewrefractoriesareintroduced,andtheremainingproblemsawaitingeffectivesolutionsarepointedout.Somesuggesionsonfuturediectionofresearchanddevelopmentarefitlymade.

简介：Poly(methylmethacrylate)(PMMA),usedasdenturebasematerialsinden-tistry,hassomeinherentdefects,suchaslowertoughnessorhigherbrittlenesswhichisoneofthemainreasonsofthefractureofdenturebaseinclinical.Therefore,manyscientistshavefocusedonhighimpactstrengthdenturebasematerials.Inthispa-per,usingMethylmethacrylate-butadiene-styrene(MBS)asareinforcementagent,

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简介：Thefollowingisthethirdpartof'CreateaNewSituationinAllFieldsofSocialistModernization'—Reporttothe12thNationalCongressofTheCommunistPartyofChina,September1,1982,byHuYaobang.

简介：IntheMetalsIndustry,interruption-freeprocessestoproducehigh-qualityendproductsareaprerequisite.Themaindrivestogetherwiththemillstandsplayakeyroleinthesuccessofrollingmills.Thecrucialdemandsplacedonthedrivesystemare:high-dynamicperformanceofdriveanditscontrolsystem,abilitytohandletheprocessrelatedoverloads,smoothrunning,highavailability,highefficiency,easyserviceabilityandabilitytointegrateseamlesslywiththeautomationsystems.WithnumerousreferenceinstallationsandmanyyearsofexperienceSiemensVAIhasthewiderexpertiseandtheportfoliotoprovidetherightdriveforeveryapplication.Thispaperexaminesthelatestinnovation,SINAMICSdrivetechnology,forbothnewdriveapplicationsaswellasformodernizingtheexistingdrivesinrollingmillapplicationslikehotstripsmills,platemills,coldrollingmills,andlongrollingmills.

简介：ApprovedbyInnerMongolianGo-vernmentansStateScienceandTechnologyCommittee,aREHigh-

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