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简介：Immersionofautomotivepartsinafluidizedbedoffoundrysandisusedtobothstripthecastingsfreefrommouldingsandandtoheat-treatthecastingsat500?C.Thefluidbedisheatedbyhotgasesfromaburnerdirectedfirstintoaserpentineheatexchangerlocatednearoneside-walloftherectangulartank,andthenintoadistributorconsistingofhorizontalspargerpipeshavingmaintenancestandpipesfixedintotheiruppersurfaces.

简介：Amodifiedsuctioncaisson(MSC),whichwasreportedbytheauthorsofthispaperpreviously,comprisesanexternalshort-skirtedstructurethatisaddedtoaregularsuctioncaisson(RSC).IthasbeenprovedthatMSCscanimprovethelateralbearingcapacityandlimitthedeflectionofthecaissoncomparedwithRSCs.AseriesofmodeltestswereconductedtoinvestigateresponsesofMSCssubjecttoupliftloadinginsaturatedsand.TheeffectsofexternalskirtdimensionsontheupliftbearingcapacityofMSCswereconsidered.Inaddition,theinfluencesofthesealedtoplidoftheskirtedstructureontheupliftbearingcapacityandtheresultingpassivesuctionofMSCswerealsostudied.ItwasfoundthattheupliftbearingcapacitiesofMSCsare1.4-1.7timesthatofRSCs.Moreover,testresultsinserviceableconditionsshowthatthesealedexternalskirtedstructureofperspex-madesuctioncaissonssignificantlycontributedtotheupliftbearingcapacityasaresultofpassivesuction.

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简介：Itisgenerallyacceptedthatthecompositionsandpropertiesofsoilorganicmatter（SOM）arein?uencedbymanyfactors.InordertorevealtheeffectsofsoiltextureoncharacteristicsanddynamicsofSOManditssub-fraction,humicacid（HA）,alongtwosoilpro?les,ayellowsoilpro?leandapurplishsoilpro?le,underthesameclimateandvegetationconditionsweredetermined.Resultsindicatethatthedecompositionandhumi?cationdegreesofSOMandHAofthepurplishsoilsarehigherthanthoseofthecorrespondingyellowsoilsindicatedbyA/O–AratiosofHAs,TOCsandHAyieldsofbulksoilsamples,nevertheless,thedevelopmentdegreeofthepurplishsoilislowerthanthatoftheyellowsoil.ThevariationsofE4/E6ratiosofHAsalongthesoilpro?lesindicatetheoverallmolecularsizesofHAsdecreaseddownwardalongthesoilpro?les.A/O–AratiosofHAsdecreaseddownwardalongboththesoilpro?lesindicatethathumi?cationprocessesdecreasedownwardalongboththesoilpro?les.LeachingofSOMshowssigni?canteffectsonthedistributionandcharacteristicsofHAsintheyellowsoilpro?lebutthepurplishsoilpro?le,whichisconsistentwiththehigherhydrophobicityofHAsinpurplishsoils,showsthatthedistributioncharacteristicsofSOMalongthesoilpro?lesareacomplexresultofthecombinationofsoiltextureandcharacteristicsofSOMitself.TheremarkablydifferentsandcontentsareconcludedtentativelyasoneofreasonstothedifferentdistributionsanddynamicsofHAsalongthesoilpro?les,however,toprofoundlyunderstandtheevolutionandtransportofSOMalongsoilpro?lesneedsmoreresearches.

简介：这份报纸关于流动和在雨季(7月8月)期间承担的沉积运输大小报导2008在GerebOda上，一陡峭，沙床短暂溪流，在北埃塞俄比亚排干考包结构的盆的西方的边缘。自从它响应个人，高紧张和空间地限制的暴风雨仅仅受到分散的闪光洪水，GerebOdastreambed是干燥的大多数一年。的信息水力并且在陡峭的沙床的沉积运输进程，短暂溪流是很差的，尽管二仅仅闪光洪水发生在域运动期间，数据聚在一起可以贡献在这些种河里改进我们的知识。弗鲁德数字被计算以便验证从沉积结构特征的分析由一些作者要求了的supercritical流动条件的出现。流动数据也与简单模型相比预言流动速度并且自从流动记录系统很少在遥远的区域和发展中的国家在短暂溪流上被安装，排出。Dryland河以他们的很高推迟的沉积运输，而是很小的水流带来的碎石数据著名为沙床存在，短暂的流。有分泌物的推迟的沉积集中的变化被分析，简单评价弯为推迟了，床负担运输被导出。预言水流带来的碎石的一些方程对GerebOda数据和关系在之间被测试一起，水流带来的碎石运输通过叶子形的、像表的bedforms的移植处理同样薄的沙床单和水平迭合的开发被调查。单个、大大石头被观察在他们的尺寸的一样的数量级的流动深度移动。为大粒子乘火车预言阀值条件的一些功能被用来如果，验证并且回答条件到到什么程度，他们匹配GerebOda。为从100,000～200,000ppm的高推迟的沉积集中，水沉积混合的增加的密度也被考虑。

简介：点速度和推迟的沉积集中大小被用来在沙床河里计算全部的沉积分泌物。有修改爱因斯坦点过程(SEMEPP)的系列扩大的计算取决于谷物直径ds和安定速度，流动深度h砍速度u*,和采样深度hp。这个过程由使用点沉积集中和速度大小扩大修改爱因斯坦过程(MEP)的适用性。这个过程从科尔曼用实验室数据被测试，并且从Enoree，中间的RioGrande和密西西比河回答大小。在从0.17m到33.5m和沉积集中的流动深度在124verticals上基于801点大小计算的精确性取决于的不到0.1kgL−1,u*/和hp/ds。当时，象SEMEPP一样的点测量技术是很相配的u*/5当90%流动深度被取样时，60%全部的沉积在哪儿至少装载，被测量。从点大小的沉积分泌物的决心在深河里是很精确的什么时候hp/ds>10,000，并且u*/>10。点大小不为浅河和实验室斜槽是很相配的在哪儿h<0.5m并且什么时候u*/<2。

简介：Theperformanceofawell-designedlayerofsand,andcompositeslikelayerofsandmixedwithshreddedrubbertire(RSM)aslowcostbaseisolators,isstudiedinshaketabletestsinthelaboratory.Thebuildingfoundationismodeledbya200mmby200mmand40mmthickrigidplexi-glassblock.Theblockisplacedinthemiddleofa1mby1mtankfilledwithsand.Theselectedbaseisolatorisplacedbetweentheblockandthesandfoundation.Accelerometersareplacedontopofthefootingandfoundationsandlayer.ThedisplacementofthefootingisalsomeasuredbyLVDT.Thewholesetupismountedonashaketableandsubjectedtosinusoidalmotionswithvaryingamplitudeandfrequency.Sandisfoundtobeeffectiveonlyatveryhighamplitude(>0.65g)ofmotions.Theperformanceofacompositeconsistingofsandand50%shreddedrubbertireplacedunderthefootingisfoundtobemostpromisingasalow-costeffectivebaseisolator.

简介：ShanghaiislocatedineasternChinaandisbuiltonoverburdensoillayers.ItcanbeseenfromtheMexicoMs=8.1earthquakeonSeptember19,1985andtheHanshinMs=7.4earthquakeonJanuary17,1995thatheavycasualtiesandpropertylosseshaveadirectrelationshipwithoverburdensoillayers.Groundmotionscausedbyearthquakesaresignifieantlyamplifiedwhenpassingthroughthesoillayers.Undertheinfluenceoftheseamplifiedmotions,buildingstructures,whosenaturefrequencyiswithinthefrequencybandofsoilamplificationresponse,willexperiencemoreseveredamagethanthosebuiltonbedrock.Therefore,engineeringseismologistshavepaidconsiderableattentiontheamplificationresponsesintheShanghaioverburdensoillayers.TheamplificationresponsesofsoilandsandlayersinthispaperaregivenbytheML=4.1earthquakeinNantong,JiangsuProvinceonDecember25,2001at31.8°N,120.9°E.Itcanbeseenthattheresponsesofsoilandsandlayersareverydifferent.Thatisimportant.

简介：High-temperatureperformancetestsofchromium-containingstuffingsandforasteelladlewithdifferentratioswereperformed.Ahigh-temperaturesimulationtestfurnacewasusedtoanalyzetheinfluenceofthecompositionratioofladlefillersandandsinteringtimeonthehigh-temperaturecompressionresistanceofchromium-containingstuffingsandinthetemperaturerangeof1500-1600℃.Theresultsshowthattherefractorinessofladlefillersandwasthelowest(only1610℃)whenthecompositionratioofchromitesandandsilicasandwas6∶4.Moreover,thehigh-temperaturecompressionresistancewashighwhenthecontentofchromitesandwasat70%;theresistanceincreasedwithincreasingsinteringtime.Whenthesinteringtimewasextendedatatemperatureof1600℃,thehigh-temperaturecompressionresistanceofladlefillersandfirstincreasedandthendecreasedafterbeingoverburnt.

简介：Windblownsandfluxanddunefieldevolvingtowardtheoasishavebeenacommonecologicalandenvironmentalthreatconfrontedbymanycountries.Meanwhile,itisalsoakindofcomplexdynamicalprocessinvolvingmultipletemporalandspatialscaleswhichisstilloutofaccuratedescriptionthroughcurrentfieldobservations.Availablemodelsandreliablequantitativesimulationsareofsignificantvaluetopredictthespreadingrateofdesertificationandprovideanoptimaldesignforsandprevention.Thisp...

简介：在在活动的沙沙丘上的狂暴的液体运动和沉积粒子运动之间的关系被在在USDA-ARS-National沉积实验室执行的实验室实验使用激光Doppler速度计和一个声学的反散射系统调查。当以活动沙丘bedforms的速度下游地翻译两台测量设备时，从粒子和at-a-point骚乱数据的声学的反散射的侧面被收集。产生数据集合被用来检验波动的反散射和液体速度信号基于标准差在超过了大小阀值的频率(复发频率)()本地速度和大小从推迟的粒子源于反散射的声学的信号。下游、垂直的速度复发频率的斜坡通常与增加举起显示了一逐渐地增加的复发时间。为声学的反散射数据的复发频率不与举起是强烈可变的。在在1大小阀值的沉积反散射和垂直速度的复发频率之间的最靠近的通讯被X/L在一个区域定义<0.4并且y<6厘米。下游的速度是最仔细与在在0.4点的一个小区域的反散射有关

简介：“Ejin节”在调查的EjinOasiswas在一个典型盖住植被的沙丘发现了。在这研究，263件样品为谷物尺寸分析从节被拿，25for化学药品分析，11为~(14)标明日期的C并且6为扫描电子显微镜(SEM)。学习的Theresults显示在节的沉积的3种类型能被识别，YS，LSand圣伊斯，同类的黄褐的沙丘沙，等于内陆沙漠的那些，LS，像黄土的砂土，与在中间的沙的黄土一样黄河和现代掉落灰尘，和圣，沙的沉积内部有Tamarixspp的枯枝和落叶的beded，代表突然的变化在气候打断的节的depositional过程。自从2500年BP和灰尘暴风雨的高峰时期，TheEjin节记录了重复灰尘暴风雨或沙暴或节揭示的沙暴在历史的文学与“灰尘雨”的记录一致，显示气候的变化是增加沙暴或灰尘暴风雨的一个关键因素，而，“人工”的因素可以仅仅是加速的fordesertification。

简介：Thecomplexityoftheloadsactingontheoffshorewindturbines(OWTs)structuresandthesignificanceofinvestigationonstructuredynamicsareexplained.Testresultsobtainedfromascaledwindturbinemodelarealsosummarized.Themodelissupportedonmonopile,subjectedtodifferenttypesofdynamicloadingusinganinnovativeoutofbalancemasssystemtoapplycyclic/dynamicloads.Thetestresultsshowthenaturalfrequencyofthewindturbinestructureincreaseswiththenumberofcycles,butwithareducedrateofincreasewiththeaccumulationofsoilstrainlevel.Thechangeisfoundtobedependentontheshearstrainlevelinthesoilnexttothepilewhichmatcheswiththeexpectationsfromtheelementtestsofthesoil.Thetestresultswereplottedinanon-dimensionalmannerinordertobescaledtopredicttheprototypeconsequencesusingelementtestsofasoilusingresonantcolumnapparatus.

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简介：Thetypicalblackstormsorsand-duststormsinthenorthwesternChinaaregeneratedanddevelopedthroughaninteractionbetweenthespecificlargescalecirculationpatternandmesosealesystems.Thepassingby/overahugesand-abundantdesertofastrongcoldfrontwithintensivefrontalzoneatmidandlowerlevelsisanecessaryconditionfortheformationanddevelopmentofablackstormoraseveresand-duststorm.Inordertoinvestigatethemechanismofthesand-dustmobilization,transportandsedimentationduringtheblackorsand-duststorms,aparameterizationschemeofsand-dustsource-sinktermsandanequationoftransportforthesand-dustwereproposedandincorporatedintotheMM4mesoscalemodel.ThemodifiedMM4modelwasappliedtothe“May1993”blackstormcaseandsucceededinreproducingtheevolutionoftheweathersystemsassociatedwiththeblack-storm,thesand-dustconcentrationatsurfacelayeranditsverticaldistribution,andthesand-dustsedimentationandtransport.Ourresultsshowthatthenumericalsimulatingmethodbyusingamesoscalemodel,withinclusionofanequationofthesand-dusttransportandaparameterizationschemeofthesand-dustsource-sinkterms,isapromisingapproachtostudythemechanismforsand-dustmobilization,transportandsedimentationduringasand-duststormevent.

简介：在种亩的庄稼以后取决于地面雪状况，土壤潮湿损失速度和土壤结构的分析我们在休闲时期与长石的沙岩补救的沙的土地，与沙混合的长石的沙岩在亩的统治改进了沙稳定，这被结束我们在休闲时期的沙的土地。与长石的沙岩补救的沙的陆地有大雪范围，比正常高的25%75%沙；土壤潮湿损失慢下来，并且潮湿内容到超过3次升起了；土壤结构被改进了，并且水马厩总数内容由6.52%18.04%增加了；保护森林的幸存率增加了到85%；并且地面平坦是不到1%。削弱的沙升起亩调节的上述条件我们在休闲时期的沙的土地并且形成了雪的二保护的层盖住并且在冷天气下面玷污冻结的层以便对风侵蚀阻止。

简介：Consideringtheeffectsofparticlecrushingandintermediateprincipalstressonmaterialyieldingstrength,thespatialmobilizationplane(SMP)yieldingcriterionandstateparametermodelincludingageneralcriticalstatelineareselectedintheanalysisofcylindricalcavityexpansion.Meanwhile,combiningRowe'sflowruleandBolton'ssimplificationtostress-dilatancyrelationshiptoreflectsoilsheardilatancyandsofteningbehavior,thispaperanalyzestheproblemofcylindricalcavityexpansioni...

简介：Microbe-inducedcalciteprecipitationisasustainableimprovementtechniqueforsandysoil,whichcanalterthepropertiesofsandviamicrobialactivity.Inthisstudy,weinvestigatedtheloose-sand-consolidationeffectbycontrollingtheinjectionvelocity,bacterialandcementingsolutionconcentrations,andholdtimes.Theresultsdemonstratethat,asthecyclicbatchincreases,theutilizationrateofthebacterialfluidincreasesandboththeopticaldensity(OD600)ofthebacteriaandureaseactivitydecrease.Moreover,itwasdeterminedthata3-hholdtimefora0.5mol/Lcementingsolutionwithacementingfluidvelocityof2mL/minhasthegreatestbondingeffect.Thefinalstrengthoftheloosesandwithanincreaseincalciumcarbonatecontentwasfurtherdiscussed.

简介：深海的turbidite隧道在石油探索和开发作为一个集中的问题吸引了许多注意。广泛的研究在turbidite隧道的建筑学上被执行了，并且大多数研究集中了于他们的几何形状，沉积过程和控制因素。然而，很少注意都没对分发模式，分发法律和turbidite隧道的合成的沙身体的量的研究被给予。作为一个例子拿尼日尔三角洲盆的一个斜坡区域，进行的这研究一对turbidite隧道的合成的沙身体的建筑学上的定量分析半量基于核心，好记载和地震调查。turbidite隧道系统能是限制被分类，这被显示出并且自由隧道系统。为限制隧道系统，垂直进化过程包含四个阶段。一个隧道系统的蜿蜒被斜坡控制，在他们之间的一种否定力量函数关系地。当斜坡坡度到达四度时，隧道系统是将近直的。在隧道建筑群以内基于移植方向和单个隧道的移植数量，隧道合成模式能被划分成四个类(侧面合成，在军队飞机合成，合成、垂直的秋千合成)并且几个子类。各种各样的隧道合成模式空间地显示出特定的分发法律。为在限制隧道系统的中间迟了的进化阶段的蜿蜒地流的隧道建筑群，在单个隧道之中的侧面的迁居显示出正直和继任的特征。在迟了的时期的单个隧道的蜿蜒在早时期比那大，并且当蜿蜒比五度大时，cut-offs可以局部地发生。这研究为地质的理论提供更好的理解深海沉积，并且也改进这类水库的利用好处。