简介:Theissuesofwarandpeacecapturedinternationalattentionin2014.ItwasthecentennialofWorldWarI,andthefocuswasontensionsinAsiaforthefirsthalfoftheyear.OneradicalWesternviewwentsofarastocomparetoday'sChinatopre-warGermanyinthemidstofrapideconomicgrowth,risingnationalismandabeefedupmilitary.ThehypeaboutBeijing'sallegedregionalexpansionpeakedattheShangri-LaSecurityForum(Singapore)inMay2014.However,eventsonthegroundprovedsuchglibaccusationswrong.InOctober2014,thisauthoraccompaniedseveralotherChinesescholarsinavisittosevenU.S.thinktanks.OurAmericanhostswerenotworried
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:Inordertoinvestigatetheinjectioncurrentuniformityaroundtheinductioncellbores,twofullyelectromagnetic(EM)modelsarerespectivelyestablishedforasingle-stageinductioncellandaninductionvoltageadder(IVA)withthreecellsstackedinseries,withoutconsideringelectronemission.Bymeansofthesetwomodels,somefactorsaffectingtheinjectioncurrentuniformityaresimulatedandanalyzed,suchastheimpedancesofaddersandloads,celllocations,andfeedtimingofparalleldrivingpulses.Simulationresultsindicatethathigherimpedancesofadderandloadsareslightlybeneficialtoimproveinjectioncurrentuniformity.Astheimpedancesofadderandloadsincreasefrom5Ωto30Ω,theasymmetriccoefficientoffeedcurrentsdecreasesfrom10.3%to6.6%.Thecurrentnon-uniformitywithinthefirstcellisalittleworsethanthatinotherdownstreamcells.Simulationresultsalsoshowthatthefeedtimingwouldgreatlyaffectcurrentwaveforms,andconsequentlycausesomedistortioninpulsefrontsofcelloutputvoltages.Foragivendrivingpulsewithdurationtimeof70-80ns,thefeedtimingwithatimedeviationoflessthan20nsisacceptableforthethree-cellIVAs,justcausingtherisetimeofoutputvoltagestoincreaseabout5nsatmostandmakingthepeakvoltagedecreaseby3.5%.
简介:Choosingparticularsolutionsourceanditspositionhavegreatinfluenceonaccuracyofsoundfieldpredictionindistributedsourceboundarypointmethod.Anoptimizationmethodfordeterminingthepositionofparticularsolutionsourcesisproposedtogethighaccuracypredictionresult.Inthismethod,tripoleischosenastheparticularsolution.Theupperlimitfrequencyofcalculationispredictedbysetting1%volumevelocityrelativeerrorlimitusingvibrationvelocityofstructuresurface.Then,theoptimalpositionofparticularsolutionsources,inwhichtherelativeerrorofvolumevelocityisminimum,isdeterminedwithintherangeofupperlimitfrequencybysearchingalgorithmusingvolumevelocitymatching.Thetransfermatrixbetweenpressureandsurfacevolumevelocityisconstructedintheoptimalposition.Afterthat,thesoundradiationofstructureiscalculatedbythematrix.Theresultsofnumericalsimulationshowthatthecalculationerrorissignificantlyreducedbytheproposedmethod.Whentherearevibrationvelocitymeasurementerrors,thecalculationerrorscanbecontrolledwithin5%bythemethod.
简介:BackgroundAcuterespiratorydistresssyndrome(ARDS)causedbyH7N9influenzainpregnantwomanisalife-threateningeventwithanincreasedriskformaternalandbaby'sdeath.Theaimofthisstudywastoevaluatetheimpactofpoint-of-careultrasonography(POCUS)onthemanagementandprognosisofthesepatients.MethodsAcaseof31-yr-oldpregnantwomaninourhospital,whowasunderwentPOCUSforevaluatingcardiopulmonaryfunctions,volumestate,fluidresponsivenessandultrasound-guidedprocedureswasadmittedtoIntensiveCareUnit(ICU).Weperformedultrasonographydailyformonitoringorganfunctions.Reviewofrelatedliteratureswasalsoconducted.ResultsWiththehelpofPOCUS,wemadequicklydiagnosisofseverepneumoniaandARDScausedbyH7N9influenza.ThetherapieshadalsobeenchangedafterPOCUSexaminations,suchasrestrictfluidadministrationrelyingontheassessmentsoftheinferiorvenacava(IVC)toestimatepreloadandlungultrasoundmonitoringtoidentifytheearlypresenceofextravascularlungwater(EVLW)andavoidfluidoverresuscitation,ultrasound-guidedrecruitmentmaneuvertoimprovedrespiratorydistresssyndrome,andsoon.ConclusionsPOCUShasasignificantimpactondecision-makingandtherapeuticmanagementandshouldbecomeaclinicalroutineinthemanagementofARDSpatientscausedbyH7N9influenzainpregnancy.
简介:AclassΦof5-dimensionalfunctionswasintroducedandanexistenceanduniquenessofcommonfixedpointsforafamilyofnon-selfmappingssatisfyingaφiquasi-contractiveconditionandacertainboundaryconditionwasgivenoncompletemetricallyconvexmetricspaces,andfromwhich,moregeneraluniquecommonfixedpointtheoremswereobtained.Ourmainresultsgeneralizeandimprovemanysametypecommonfixedpointtheoremsinreferences.
简介:由与链纠纷的不同的度准备同质的混合样品,我们报导链纠纷的异常贡献分阶段执行分离温度和介绍典型更低的批评答案温度LCST行为的polymethylmethacrylate/polystyrene-co-maleic酐PMMA/SMA混合的率。有更高的链纠纷密度的meltmixedPMMA/SMA混合介绍更低的云点Tc和更短的延期时间,而是更低的阶段分离比答案演员组在给定的温度评价,为聚合物建议那与不同压缩状态相配结构,热力学地,分阶段执行分离的更多的容易降低Tc未必等价于更快的动力学分解率。试验性的结果显示更低的T融化混合样品的c被归功于到更小的集中变化波长m由更高的纠纷度导致了,当在融化混合样品的更高的纠纷度导致限制部分动力学时并且因而,更慢的动力学分解率由macromolecular散开统治了在一可比较熄灭深度。这些结果表明在聚合物混合收拾行李的链能显著地影响液体液体阶段分离行为,它是从小分子的混合物的分解的重要差别。
简介:Theoreticalanalysisoftheelectromagneticfielddistributioninthefocalregionofalongmetallicparabolicreflectorthathasitssurfacecoveredwithamagnetizedplasmalayerisderived.Theincidentwaveisconsideredtobewithageneralobliqueincidenceforbothparallelandperpendicularpolarizations.TheelectromagneticfieldintensityexpressionsalongthefocalregionareobtainedaccuratelyusingMaslov’smethod.Theeffectsofplasmathicknessonthereflectedandtransmittedfielddistributionsareinvestigated.Theeffectsofotherphysicalparameterssuchastheangleofincidenceandtheplasmaandcyclotronfrequenciesonthetransmittedfieldintensitydistributionalongthefocalregionarealsostudied.TheresultsobtainedbyMaslov’smethodandKirchhoff’sapproximationarefoundtobeinagoodagreement.
简介:Theresultsonadissociationbehaviorofpropanehydratespreparedfrom'drywater'andcontainedunreactedresidualwaterintheformoficeinclusionsorsupercooledliquidwater(watersolutionofgas)werepresentedfortemperaturesbelow273K.Thetemperaturerampingorpressurereleasemethodwasusedforthedissociationofpropanehydratesamples.Itwasfoundthatthemechanismofgashydratedissociationattemperaturesbelow273Kdependedonthephasestateofunreactedwaterinthehydratesample.Gashydratesdissociatedintoiceandgasiftheiceinclusionswereinthehydratesample.Thesamplesofpropanehydrateswithinclusionsofunreactedsupercooledwateronly(withouticeinclusions)dissociatedintosupercooledwaterandgasbelowthepressureofthesupercooledwater-hydrate-gasmetastableequilibrium.