简介:打印的3D变得流行并且广泛地在最近的年里在各种各样的应用被使用了。越来越多的家用户有动机设计他们的自己的模型然后用3D打印机制作他们。然而,打印目标可以有结构的一些或因为用户可以是3D模型上的压力分析上的知识的缺乏,强调缺点。在这份报纸,我们在场帮助用户分析的一条途径一模型结构的力量当设计它的形状时。我们采用部分结构的分析而不是常规女性(有限元素方法)计算地昂贵的分析。基于部分结构的分析,我们在集成网孔设计帮助的途径进口骨骼,力量计算和网孔修正很好。骨骼能也指导节为分析造和负担计算。为有在在从分析结果的模型的阀值价值上的高应力的弱区域,我们的系统由放大骨骼的相应骨头以便使这些区域足够生硬改正他们。很多个实验表明了我们的途径的适用性和有实行可能。
简介:Theconventionalpseudo-staticapproachoftenneglectstheeffectoftheverticalseismicaccelerationonthestabilityofaslope,butsomeanalysesunderplane-strain(2D)conditionsshowasignificanteffectontheslopestability.Thepurposeofthisstudyistoinvestigatetheeffectoftheverticalaccelerationonthesafetyofthree-dimensional(3D)slopes.Inthestrictframeworkoflimitanalysis,a3Dkinematicallyadmissiblerotationalfailuremechanismisadoptedherefor3Dhomogeneousslopesinfrictional/cohesivesoils.Asetofstabilitychartsispresentedinawiderangeofparametersfor3Dslopesundercombinedhorizontalandverticalseismicloadingconditions.Accountingfortheeffectsoftheverticalseismicacceleration,thedifferenceinsafetyfactorsfor3Dslopescanexceed10%,whichwillsignificantlyoverestimatethesafetyofthe3Dslopes.
简介:Thispaperpresentsahandheld3Dvision-basedscannerforsmallobjectsbyusingKinect.Itisdifferentfromthepreviouscolor-glove-basedapproacheswhichrequiresegmentingthetargetobject.First,weeliminatethenoisesandtheoutlierscausedbyholdinghands.Second,weapplyKinect-fusionalgorithmandtruncatedsigneddistancefunction(TSDF)torepresent3Dsurfaces.Third,weproposeamodifiedintegrationstrategytoeliminatethehandeffect.Fourth,wetakeadvantageoftheparallelcomputationofGPUsforreal-timeoperation.Themajorcontributionsofthispaperare(1)theregistrationprecisionisimproved,(2)theofflineamendmentandloopclosureoperationarenotrequired,and(3)concave3Dobjectreconstructionisfeasible.IndexTermsHandheld3Dscanning,Kinect-fusion,Truncatedsigneddistancefunction(TSDF).1.IntroductionRecently,thesensor-based3Dmodelreconstructionmethodshavebeenproposed[1].Thesensordeviceshavedifferentpropertiessothatthe3Dreconstructionalgorithmsvaryaccordingly.Thecommonlyusedsensordevicesaretime-of-flight(ToF)cameras[2]-[4],laserscanners[5],andstructuredlightscanners[6],[7].Lasershavegainedareputationforaccuracy;however,caremustbetakentouseeye-safelaserswhenoperatinginproximitytohumans.Foraninteractivesystem,thestructuredlightscannerwhichisbasicallyapassivevision-basedsensordeviceissuperiorbecauseitprovidesa2DdepthimageperframeandismoreaccuratethanthatofaToFcamera.Here,wepresentareal-time3DscannerusingthedepthimagescapturedbyKinect.
简介:TheLa-CosubstitutedSr_(1–x)La_xFe_(12–x)Co_xO_(19)(x=0–0.5)ferriteswithappropriateBi_2O_3additivewerepreparedbyconventionalsinteringmethodandmicrowavesinteringmethodatlowsinteringtemperaturescompatiblewithLTCC(lowtemperatureco-firedceramics)systems,andtheirsinteringbehaviorwaschieflyinvestigated,includingthecrystalstructure,saturationmagnetizationMs,magneticanisotropyfieldHa,intrinsiccoercivityHci,andCurietemperatureTC.ExperimentresultsclearlyshowedthatthepureM-typecrystalphasewassuccessfullyobtainedwhentheLa-Cosubstitutionamountxdidnotexceed0.3.However,thesingleM-typephasestructuretransformedtomultiphasestructurewithfurtherincreasedx,wheretheM-typephasecoexistedwiththenon-magneticphasesuchasα-Fe_2O_3phase,La_2O_3phase,andLaCoO_3phase.AppropriateLa-CosubstitutionimprovedtheMs(〉62emu/g),Ha(〉1400kA/m),andHci(〉320kA/m)fortheferriteswithxvaryingfrom0.1to0.3,buttheTCdecreasedwithincreasingsubstitutionamount.Moreover,themicrowavesinteredferritescouldprovidelargerHciandsimilarMscomparedwiththeconventionalsinteredferrites.
简介:水电厂机电设备的信息化运行能够提升其善作效率,建加有助于实现数字化的水电厂通信网络平台。文章阐述了Modbus通讯协议及其原理,根据不同系统的现场总线协议差异失,且不同总线协谌应用范围存在差异的问题,对Modbus协议的AC800M控制器与雅达EPM420交流采样装置的通信技术进行探讨,从而进一步实现数字化的水电厂通信平台。
简介:AM_L3.8earthquakeoccurredonFebruary23,2014inRongchangCounty,whichislocatedatthesouthernedgeoftheSichuanBasinintheborderareabetweenSichuanandChongqing.ThispaperpresentsresultsoffocalmechanismsolutionofthisearthquakeusingtheCAP(cutandpaste)methodbasedonbroadbandseismogramsrecordedbyregionalseismicstations.OurresultsshowthatthemomentmagnitudeisM_W3.09andfocaldepthis3km.ThehypocenterofthisearthquakeislocatedclosetoaburiedfaultintheLuoguangshananticline.Oilprospectinganddeepdrillingdataindicatethatthisburiedfaultisathrustfault,strikingSW230°,dippingNW45°,and1.7kmdeep.Therearesomeinjectionwellswithintheanticline,andsignificantinjection-inducedearthquakeswereobservedduringtheperiodsofinjectionofwastewaterintothedeepformationsthroughthosewells.ThebestdoublecouplesolutionoftheM_L3.8earthquakeis247°,48°and104°forstrike,dipandrate,respectively,foronenodalplane(and46°,44°and74°foranothernodalplane),whichisinagreementwiththegeometryoftheburiedfault.Therefore,weconcludethattheM_L3.8Rongchangearthquakeispossiblytheresultoffaultingalongtheburiedreversefaultinducedbywaterinjectionunderthecompressivestressregimeinthearea.
简介:目的总结1.94μm铥激光“三叶五步剜除法”治疗良性前列腺增生(BPH)的技巧及疗效,并评估其安全性。方法2014年5月15日至2016年5月15日期间,我院应用经尿道1.94μm铥激光手术治疗305例BPH患者。患者平均年龄(70.3±17.8)岁,前列腺体积(71.8士24.3)ml(40~190m1),国际前列腺症状评分(IPSS)(22.8±4.9)分,最大尿流率(Qmax)(7.2±2.8)ml/s,残余尿量(RUV)(97.3±18.4)ml,PSA值(2.9±1.6)ng/ml。手术方法采用“三叶五步剜除法”。结果305例患者均顺利完成手术。手术时间平均(57.2±25.9)min,导尿管留置时间2.7d(1~4d),术后3个月Qmax(23.1±5.2)ml/s,IPSS评分(7.0±3.7)分,RUV(8.9±3.3)ml,与术前相比差异均有统计学意义(P〈0.05)。无电切综合征、继发性大出血、尿道狭窄、排尿困难、远期尿失禁、尿潴留等并发症发生。无新发勃起功能障碍患者。术后组织学检查均诊断为BPH。结论1.94μm铥激光“三叶五步剜除法”组织切除彻底,并发症少,安全性高,是一种较为理想的BPH治疗方法。
简介:EarthquakesofM_S5.6andM_S6.1occurredinYingjiang,YunnanonMay24andMay30,2014respectively.Inthispaper,weusethewaveformdatarecordedbymobileseismicstations(KAC)whichweresetupinthesourceareaaftertheYingjiangMS5.6earthquakeonMay24,2014tostudytheshear-wavesplittingcharacteristicsofYingjiangM_S6.1earthquakesequencewiththeSAMmethod.Theresultshowsthatpredominantpolarizationoffastshear-wavesbeforetheM_S6.1earthquakeisconsistentwiththedirectionofregionalprincipalcompressivestress,andpredominantpolarizationoffastshear-wavesbeforetheM_S6.1earthquakeshowbetterconsistencyandsmallerdispersioncomparedtoaftertheM_S6.1earthquake,andtheremaybeadeflectionforthefastshearwavespredominantpolarizationbetweentheM_S6.1earthquakesequenceandforeshocksequence.Wefoundthatthetime-delaysgenerallyexhibitedalowerlevelbeforetheM_S6.1earthquakeandarelativelyhighervalueaftertheM_S6.1earthquake.
简介:ThesurfaceofacommercialY3Al5O12:Ce3+phosphorwasmodifiedby99%NH4F+CH3COOHsolutioninasupersonicbathwithwatertemperatureof80oCfor4h.Thescanningelectronmicroscopy(SEM)resultsshowedthattheedgeangleswerenotassharpastheunmodifiedparticlesandtheflatsurfacesturnedroughwithmanymicro-structurescovered.Positronlifetimemeasurementsquantitativelyshowedthatsurfacedefectswereremovedawaybymorethan50%.Asaresult,thephotoluminescencedeterminationsshowedthatthebackscatterlosswasreducedby4.2%andtheemissionpowerwasenhancedby5.6%afterthesurfacemodification.Theconversionefficiencywasgreatlyimprovedfrom47.3%to51.1%,aspresentedbythefluorescenceimages.Therefore,itwouldbegreatlyhelpfulfortheimprovementofefficiency,transparencyandstabilityofpc-LED.Moreover,thismethodwassignificantlysuitableformassproductionduetoitseasyoperationandlowcost.