简介：Inordertoachieveworkpiece′sautomaticloading-and-unloading,thispaperdesignsamanipulator.Usethevacuumchuckmechanismtoachievethefunctionofreclaimingandthecylinderrailstoachievethefunctionofpick-feedingmaterials.PLCcontroltechnologyisappliedtocontrolsystemandimprovetheefficiencyandreducehumanlabor.Toensurethestrength,Solidworkssimulationperformsthestressandstrainanalysistoverifymaterialstrength.

简介：-Inordertoemploycosteffectivefrequencydomainanalysisforoff-shorestructurestreatmentofhydrodynamicloadingisessential.Dragandinertiadominated,resonatingandantiresonatingcasesunderrandomseastatesareanalyzedtohighlighttheimplicationsandrelativemeritsoffoursalientlinearizationtechniques.

简介：Themostsignificantdifferencesbetweencontinuousweldedrails(CWRs)andgeneralsplit-typeconnectorsareaxialcompressioninthelongitudinaldirection,bucklingstabilityandotherissuesgeneratedundertheinfluenceofthermaleffect.Underthermaleffect,adynamicalbehaviorsimilartothatofabeamfixedontwosidesoccursinthecentrallockedareaoftheweldedrail,asthereisaxialcompressionbutnopossibilityofsliding.Continuousweldedrailsdonotcontractorexpand,andaresupportedbythedynamicalsystemmadeupofballastsandrailclips.Therail-supportsystemmentionedabovehasthefeaturesofnon-uniformmaterialdistributionanduncertaintyofconstructionquality.Duetothesefacts,thedynamicsmethodbasedonthelinearelastichypothesiscannotcorrectlyevaluatetherail'sbucklingconditions.ThisstudyisaimedatapplyingFiniteDifferenceMethod(FDM)andMonteCarloRandomNormalVariablesMethodtotheanalysisofweldedrail'sbucklingbehaviorduringthetrain'saccelerationanddeceleration,underthermaleffectanduncertainfactorsofballastandrailclips.Theanalysisresultshowedthatbucklingoccursunderthecombinedeffectofthermaleffectandthetrain'sdecelerationforceco-effectandthevarianceratioofballastandrailclipsisover0.85,orunderthecombinedeffectofthermaleffectandthetrain'saccelerationforcewhenthevarianceratioisover0.88.

简介：AnFEanalysisprocedurewaspresentedtopredictthebehaviorofsoilogeogridinterctionunderautomobileloading.Thedynamicinteractionsbetweenthetransversebars,thelongitudinalribsandthesoilweresimulatedbyasystemconsistingofnonlinearsprings,dashpotsandmasses,tostudythedeformationpropertiesofthereinforcedsoil.Theequivalentstiffnessanddampingratioscouldbedeterminedwiththeshakingtable.Thedynamicresponsesofareinforcedsubgradewereanalyzedwiththe3Dfiniteelementapproach.Thisapproachisprogrammedandappliedtoanalyzethesoilogeogridinteractionunderdynamicloading.Thecomparativeanalysisoftheresponseofthereinforcedsubgradeandthatofthesubgradewithoutreinforcementshowsthatthegeogridplacedatthebottomofthebaselayermayeffectivelyreducetheaccumulativeplasticdeformationduetothecyclicautomobileloading.

简介：最少的广场LS时间延期评价是一个古典、有效的方法。然而，表演由于矩阵inversing的不稳定性在信号噪音SNR的低比率的情形严重地被降级。以便解决这个问题，装载最少的广场DL-LS的对角线被把一个积极明确的矩阵加到反的矩阵建议。而且，修理斜装载的缺点从规则化的点被分析当低SNR的忍耐被增加时，诚实被减少。这个问题被再装解决。主要评价相互作为斜装载被介绍，它导致在到达并且在另外的时间的更大的装载的时候的小斜装载。模拟和水池实验证明算法有更好的性能。

简介：当设计一个堆积基础时，否定皮肤磨擦(NSF)是重要问题之一。然而，为堆积基础在dragload和downdrag上装载顺序的影响很少被学习。在这份报纸，一个三维的数字模型用FLAC3D被建立。与模型测试的结果相比，确定的模型能被用来学习堆积基础的NSF。影响因素包括堆积的长度直径比率和堆积头负担和超载的装载顺序被讨论。病历用FLAC3D被分析。计算结果在对测量结果的好同意。dragload和downdrag被堆积头负担和超载的装载顺序显著地影响，这被结束。dragload和downdrag在堆积头负担以后在超载的条件下面到达最大的价值。

简介：纸学习扎根的垂直变丑和附近的大楼装载引起的大地水准面波动，基于装载的潮理论。对举起的影响也被考虑。结果证明扎根的垂直变丑和大地水准面波动两个都到达毫米大小。因此，显著地装载的大楼影响调查的精确工程，是明显的，并且它必须严重在申请被考虑。

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简介：Inordertoinvestigatetheinfluenceoftheverticalvibrationloadingontheliquefactionofsaturatedsand,onedimensionalmodelforthesaturatedsandwithaverticalvibrationispresentedbasedonthetwophasecontinuousmediatheory.Thedevelopmentoftheliquefactionandtheliquefactionregionareanalyzed.Itisshownthattheverticalvibrationloadingcouldinduceliquefaction.Therateoftheliquefactionincreaseswiththeincreaseoftheinitiallimitstrainorinitialporosityoramplitudeandfrequencyofloading,andincreaseswiththedecreaseofthepermeabilityorinitialmodulus.Itisshownalsothatthereisaphaselaginthesandcolumn.Whenthesandpermeabilitydistributionisnon-uniform,theporepressureandthestrainwillrisesharplywherethepermeabilityisthesmallest,andfracturemightbeinduced.Withthedevelopmentofliquefaction,thestrengthofthesoilfoundationbecomessmallerandsmaller.Inthelimitingcase,landslidesordebrisflowscouldoccur.

简介：Theballisticpropertiesofalowsolidloadingcompositesolidpropellantfamily(Butalites)wasstudiedexperimentallybyusingpropellantformulationsbasedonhydroxy-terminatedpolybutadienepre-polymer(HTPB)asfuelbindermainbackbone,monoandbi-modalsystemammoniumperchlorateoxidizer(AP),copperchromite(CC)asburningrateacceleratorandaluminumpowder(Al)asmetallicfuel.HigherpressuresandAPcontentsaswellassmallerAPparticlesizewerefoundtoincreaseburningrate.ThesamebehaviorverifiedwithAlandCCaddition.AsignificantincreaseofburningratewasrecordedwhenCCaddedtothealuminizedformulationscomparedwiththenon-aluminizedofthesameoxidizersolidloadingandparticlesize.

简介：Vacuumloadinghasbeenexaminedasawayofpreparinguniformlyconsolidatedsoftclaysamples.Thefacilityandloadingprocedurearedescribedinthispaper.Ananalyticalsolutiontothethreedimensionalconsolidationequationisderivedforestimatingthedegreeofconsolidationofthesoilsamplewithvacuumloading.Thegivenexampleshowsthatthepredicteddegreeofconsolidationofasoftclaybulkwithvacuumloadingisclosetothatmeasuredintheconsolidationprocess.

简介：Thedynamicstressintensityfactorofathree-dimensionalellipticcrackunderimpactloadingisdeterminedwiththefiniteelementmethod.Thecomputationresultscantakeintoaccounttheinfluenceoftimeandtheratioofthewavespeedsonthestressintensityfactor.Thepresentmethodissuitablenotonlyforthree-dimensionaldynamiccrack,butalsoforthree-dimensionaldynamiccontact.

简介：Thecombustion(ballistic)propertiesofahighsolidloadingcompositesolidpropellantfamily(Butalites)wasstudiedexperimentallybyusingpropellantformulationsbasedonhydroxy-terminatedpolybutadienepre-polymer(HTPB)asafuelbindermainbackbone,bi-modalsystemammoniumperchlorateoxidizer(AP)andaluminumpowder(Al)asmetallicfuel.Burningratesweredoubledatvariouspressures,whensolidsloading(APand17%Al)wereincreasedfrom80to88%andthemeasuredcharacteristicvelocityvalueswereincreasedbyabout100m/sec.Thepressureexponent(n)valueswerelowerwith80-85%solidsloading.Theburningrateswereincreasedbyabout2-5%whencomparingthedataobtainedbystaticfiringwiththoseobtainedbythestrandburnermethod.

简介：Inselectingrationaltypesofundergroundstructuresresistingexplosion,inordertoimprovestressstatesofthestructuralsectionandmakefulluseofmaterialstrengthofeachpartofthesection,theresearchmethodofcompositestructuresispresented.Adoptingtheanalysismethodofmicro-sectionfreebody,equilibriumequations,constraintequationsanddeformationcoordinationequationsaregiven.MakinguseoftheconceptofgeneralizedworkanddirectlyintroducingLagrangemultiplierspecificinphysicalmeaning,thevalidityoftheconstructedgeneralizedfunctionalisprovedbyusingvariationmethod.Therationalrigiditymatchingrelationshipofcompositestructuresectionispresentedthroughexamplecalculations.

简介：Theresultsofundrainedcyclictriaxialtestsonthreetypesofclaysarecollectedandarelationshipamongtheaccumulatedstrain,theinitialstressstate,cyclicstressinthesoil,aswellasthenumberofcyclesisestablishedbasedontheexperimentaldata.Withthisrelationship,aprocedureisproposedforsubsidenceandstabilityanalysisonsoftclayundertheactionofcyclicloads.

简介：AbstractBackground:Vancomycin treatment failure against vancomycin-susceptible gram-positive cocci is not rare in the intensive care unit (ICU). One of the reasons for this is the substandard drug trough concentration. We aimed to examine the hypothesis that the target serum concentration could be reached earlier with a loading dose of vancomycin.Methods:This retrospective cohort study was conducted at our ICU between June 2018 and June 2020 and involved patients who were suspected of having, or confirmed to have, gram-positive cocci infection and treated with vancomycin. One group of the patients was administered a loading dose of vancomycin (loading group) and compared with the group that did not receive a loading dose (control group). The baseline characteristics, vancomycin serum concentrations, and clinical outcomes were collected and analyzed.Results:Fifty-five patients were finally included, of which 29 received a loading dose of vancomycin. The serum concentration of vancomycin before the second dose was significantly higher for the loading group than for the control group (10.3 ± 6.1 mg/L vs. 5.7 ± 4.4 mg/L, P = 0.002). The results for both groups were similar before the fifth dose (12.4 ± 7.3 mg/L vs. 10.3 ± 6.3 mg/L in the loading and the control groups, respectively; P = 0.251). The 28-day mortality was lower for the loading group than for the control group (6.7% vs. 34.6% in the loading and control groups, respectively; P = 0.026). No significant differences were observed in serum creatinine (Cr) concentrations of the two groups.Conclusion:With the loading dose of vancomycin, the target serum concentration of vancomycin may be reached earlier without increasing the risk of acute kidney injury.Trial registration:https://www.chictr.org.cn; ChiCTR2000035369

简介：Twostochasticmodelsoffatiguecrackgrowthunderconstantamplitudecyclicloadingareproposedandstudiedbyusingthestochasticaveragingmethodandtotalprobabilitytheoremtoac-countforhighfrequencycomponentandlowfrequencycomponent,respectively,oftheirregularna-tureoffatiguecrackgrowthobservedinVirkler’sexperiment.Particularattentionispaidtothepredic-tionperformanceofthemodelsunderachangeintheinitialcracklength.Itisshownthatthemodelsproposedinthepresentpaperyieldsbetteragreementwithexperimentaldatathanothermodelsavail-ableinliterature.

简介：ThispaperinvestigatesthecharacteristicsofreductionofthelateralvibrationbyuseofaTunedMassDamper(TMD)foroffshorejacketplatformsunderimpactloading.Unliketraditionalanalysis,thepresentanalysisfocnsesontheenergyconceptofTMD/structuresystems.Inthisstudy,atimedomainistaken.Theplatformismodeledasasimplifiedsingle-degree-of-freedom(SDOF)systembyextractionofthefirstvibrationmodeofthestructureandtheexcitedforceisassumedtobeimpactloading.Theenergydissipationandenergytransmissionofthestructure-TMDsystemarestudied.Finally,anoptimizedTMDdesignforthemodeledplatformisdemonstratedbasedonanewtypeofcostfunction-maxi-mumdissipatedenergybyTMD.ResultsindicatethatTMDcontroliseffectiveinreducingthestandarddeviationofthedeckmotionbutlesseffectiveinreducingthemaximumresponseunderimpactloading.

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简介：在氧化的缺氧的硫化物(ASO)的最佳的操作条件生物反应器被调查。最大的移动为硫化物评价；硝酸盐被发现是4.18kg/(m[3]·d)；1.73kg/(m[3]·d)分别地。装载在固定底层集中整个减少的水力的保留时间(HRT)观察的率(LR)的volumetricalvolumetri比由在固定HRT增加底层集中的那些高。在ASO反应堆的硫化物氧化部分正在生产两硫酸盐；硫；但是生产的硫酸盐的数量是约三分之一硫的。这个过程能高容忍硫化物集中，当流入的集中直到580mg/L时，硫化物移动百分比总是在99%附近留下了。它容忍了因为当流入的集中在110mg/L上面被增加时，移动百分比落下到85%，相对降低硝酸盐集中。这个过程能容忍更短的HRT但是小心的操作被需要。自从当HRT从3.12h被减少到2.88h时，进程性能突然地败坏了，硝酸盐变换比硫化物变换对HRT更敏感。以便在反应堆避免亚硝酸根累积，流入的硫化物；硝酸盐集中应该在280mg/L被保留；67.5mg/L分别地。现在的生物工学为把硫化物从下水道移开是有用的；原油。