学科分类
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57 个结果
  • 简介:用从1998~2013的大气的观察数据,驻扎降雨数据,TRMM(热带降雨测量使命)为高原旋涡的数据,以及年度统计并且砍线,持续离开高原旋涡(SDPV)的联合活动特征和西南旋涡(SWV)被分析。一些新、有用的观察事实和理解关于旋涡的二种类型的联合活动被获得。结果显示出那:(1)二个旋涡的联合活跃时期从5月到8月,并且主要在6月和7月。(2)合伙的SDPV主要在Zaduo附近发源,当SWV来自Jiulong时。(3)大多数二个旋涡几乎搬进来一样的方向,动人和低马槽东方。SDPV主要在区域行动到长江的北方,当SWV越过长江山谷是位于的时。(4)二个旋涡的联合活动经常生产持续地区性的重降雨到黄河的南方,影响中国的宽区域,并且甚至远及朝鲜半岛,日本和越南。(5)大多数二个旋涡是baroclinic或冷旋涡,并且他们两个都变得以他们的联合活动加强了。(6)当二个旋涡在海上移动时,他们的中央压力下降,他们的降雨增加,特别为SWV。(7)当在中国的东方、南部的海有热带气旋时,二个旋涡可能同时在一样的区域上旋转,或移动向南方一起如果热带气旋出现,接近海南岛。

  • 标签: 青藏高原 观测事实 西南涡 涡旋 热带气旋 长江流域
  • 简介:在变丑和垂直涡度趋势之间的一种数学关系被介绍frontogenesis功能和完全的垂直涡度方程造,它被潮湿的潜在的涡度的优点导出。从数学关系,适当地设置了大气的条件,这被显示出能让变丑以比得上另外的有利因素的率施加积极贡献到旋涡开发。在旋涡开发的变丑的效果自己与变丑有关不仅,而且取决于空气的当前的热力学、动态的结构潮湿的baroclinicity和垂直的风例如对流稳定性,砍(或水平涡度)。发生在20222012年7月期间的重降雨的格的诊断研究证明那变丑在它的整个生命周期期间在低旋涡的快速的发展阶段期间在垂直涡度的增加以后有最显著的效果。这个特征在对流稳定性趋于是零的空气主要由于近似的中立的层(大约700hPa)的存在。中立的层在旋涡发展阶段期间显著地在垂直涡度增加以后做变丑的效果,并且因此驱使垂直涡度增加。

  • 标签: 下线 服务 迁移
  • 简介:ThisstudyusesNCEP/NCARdailyreanalysisdata,NOAAoutgoinglong-waveradiation(OLR)data,thereal-timemultivariateMJO(RMM)indexfromtheAustralianBureauofMeteorologyandTibetanPlateauvortex(TPV)datafromtheChengduInstituteofPlateauMeteorologytodiscussmodulationoftheMadden-JulianOscillation(MJO)ontheTibetanPlateauVortex(TPV).Waveletandcompositeanalysisareused.ResultsshowthattheMJOplaysanimportantroleintheoccurrenceoftheTPVthatthenumberofTPVsgeneratedwithinanactiveperiodoftheMJOisthreetimesasmuchasthatduringaninactiveperiod.Inaddition,duringtheactiveperiod,thenumberoftheTPVsgeneratedinphases1and2islargerthanthatinphases3and7.Aftercompositingphases1and7separately,allmeteorologicalelementsinphase1areapparentlyconducivetothegenerationoftheTPV,whereasthoseinphase7aresomewhatconstrained.Withitseastwardpropagationprocess,theMJOconvectioncentrespreadseastward,andtheverticalcirculationwithinthetropicalatmospherechanges.Duetotheinteractionbetweenthemid-latitudeandlow-latitudeatmosphere,changesoccurinthebarocliniccharacteristicsoftheatmosphere,theavailablepotentialenergyandeddyavailablepotentialenergyoftheatmosphere,andthecirculationstructuresoftheatmosphereovertheTibetanPlateau(TP)andsurroundingareas.Thisresultsinsignificantlydifferentwatervapourtransportationandlatentheatdistribution.Advantageousanddisadvantageousconditionsthereforealternate,leadingtoasignificantdifferenceamongthenumbersofplateauvortexindifferentphases.

  • 标签: MODULATION wavelet analysis composite analysis low-frequency oscillation Tibetan Plateau vortex real-time multivariate MJO index
  • 简介:Trimethyltin(TMT)isanoccupationalandenvironmentalhealthhazardbehavingasapotentneurotoxinknowntoaffectthecentralnervoussystemaswellastheperipheralauditorysystem.However,themechanismsunderlyingTMT-inducedototoxicityarepoorlyunderstood.ToelucidatetheeffectsofTMTonthecochlea,asingleinjectionof4or8mg/kgTMTwasadministeredintraperitoneallytoadultrats.Thecompoundactionpotential(CAP)thresholdwasusedtoassessthefunctionalstatusofthecochleaandhistologicaltechniqueswereusedtoassesstheconditionofthehaircellsandauditorynervefibers.TMTat4mg/kgproducedatemporaryCAPthresholdelevationof25-60dBthatrecoveredby28dpost-treatment.Althoughtherewasnohaircelllosswiththe4mg/kgdose,therewasanoticeablelossofauditorynervefibersparticularlybeneaththeinnerhaircells.TMTat8mg/kgproducedalargepermanentCAPthresholdshiftthatwasgreatestatthehighfrequencies.TheCAPthresholdshiftwasassociatedwiththelossofouterhaircellsandinnerhaircellsinthebasal,high-frequencyregionofthecochlea,considerablelossofauditorynervefibersandasignificantlossofspiralganglionneuronsinthebasalturn.Spiralganglionneuronsshowedevidenceofsomashrinkageandnuclearcondensationandfragmentation,morphologicalfeaturesofapoptoticcelldeath.TMT-induceddamagewasgreatestinthehigh-frequency,basalregionofthecochleaandthenervefibersbeneaththeinnerhaircellswerethemostvulnerablestructures.

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  • 简介:Laser-inducedbreakdownspectroscopy(LIBS)isananalyticaldetectiontechniquebasedonatomicemissionspectroscopytomeasuretheelementalcomposition.LIBShasbeenextensivelystudiedanddevelopedduetothenon-contact,fastresponse,highsensitivity,real-timeandmulti-elementalde-tectionfeatures.ThedevelopmentandapplicationsofLIBStechniqueinAsiaaresummarizedanddiscussedinthisreviewpaper.TheresearchersinAsiaworkondifferentaspectsoftheLIBSstudyinfundamentals,dataprocessingandmodeling,applicationsandinstrumentations.Accordingtothecurrentresearchstatus,thechallenges,opportunitiesandfurtherdevelopmentofLIBStechniqueinAsiaarealsoevaluatedtopromoteLIBSresearchanditsapplications.

  • 标签: LASER-INDUCED BREAKDOWN SPECTROSCOPY (LIBS) QUANTITATIVE analysis
  • 简介:Laser-induceddamageinfusedsilicaopticsgreatlyrestrictstheperformancesoflaserfacilities.Grayhazedamage,whichisalwaysinitiatedonceriapolishedoptics,isoneofthemostimportantdamagemorphologiesinfusedsilicaoptics.Inthispaper,thelaser-inducedgrayhazedamagesoffourfusedsilicasamplespolishedwithCeO_2,Al_2O_3,ZrO_2,andcolloidalsilicaslurriesareinvestigated.Foursamplesallpresentgrayhazedamageswithmuchdifferentdamagedensities.Then,thepolishing-inducedcontaminantandsubsurfacedamagesinfoursamplesareanalyzed.TheresultsrevealthatthegrayhazedamagescouldbeinitiatedonthesampleswithoutCecontaminantandareinclinedtoshowatightcorrelationwiththeshallowsubsurfacedamages.

  • 标签: 激光诱导损伤 熔融石英 灰色 抛光 光学 浅层
  • 简介:在角落分离/货摊控制上在endwall依附的旋涡发电机喷气(VGJ)的效果被数字模拟在高拐弯处的线性压缩机串联调查。结果证明角落分离能显著地被减少,它象一个更一致的出口流动角度和全部的压力侧面一样导致一个更宽的操作范围。在近货摊的操作点,全部的压力损失的最大的相对减小直到32.5%,,而喷气团比率是不到0.4%,。基于详细流动结构的分析,endwall十字流动和角落分离上的VGJ的三主要效果被识别。一个人是增加正切的速度部件相反的穿过流动,因此禁止endwall喷气出口附近的第二等的流动。第二是作为一个空气篱笆压制经过旋涡的pitchwise延期。第三是在起来洗的方面上向主流打扫低精力液体并且把主流的液体搬运到endwall到重新给与能量down-washed方面上的边界层。

  • 标签: 天津大学学报 英文版
  • 简介:Vortexbeamswithfractionaltopologicalcharge(FTC)havemanyspecialcharacteristicsandnovelapplications.However,oneoftheobstaclesfortheirapplicationisthedifficultyofpreciselydeterminingtheFTCoffractionalvortexbeams.WefindthatwhenavortexbeamwithanFTCilluminatesadynamicangulardoubleslit(ADS),thefar-fieldinterferencepatternsthatincludetheinformationoftheFTCofthebeamattheangularbisectordirectionoftheADSvaryperiodically.Basedonthisproperty,asimpledynamicADSdeviceanddatafittingmethodcanbeusedtopreciselymeasuretheFTCofavortexlightbeamwithanerroroflessthan5%.

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  • 简介:空气隔板提供安全、干净、适当的空气流动给引擎并且广泛地与象轮船和潜水艇那样的大引擎在车辆被使用。在这运作的研究,在清洗的一个Ranque-Hilsch旋涡试管内的分离进程(冷却)系统被调查在旋涡试管性能上分析操作煤气的类型的影响;使用的操作气体是空气,氮,氧,二氧化碳和氮二氧化物。动态模型使用了的计算液体与三维的结构被装备,并且不变的条件在计算期间被使用。标准k-骚乱模特儿被雇用解决非线性的流动方程,和各种各样的关键参数,例如热、冷用尽热落下,并且驱动分离率,数字地被描述。结果证明氮二氧化物创造最大的分离从测试的所有气体的力量,和数字结果被对可得到的试验性的数据的好同意验证。另外,比较在二个不同边界条件,pressure-far-field和压力插头的使用之间被做,当在空气隔板内分析复杂狂暴的流动时。结果在未来为使用介绍一个全面、实际的答案数字研究。

  • 标签: 分离过程 数值研究 三维结构 涡流管 空气分离器 流体动力学模型
  • 简介:TheChineseFusionEngineeringTokamakReactor(CFETR)isanimportantintermediatedevicebetweenITERandDEMO.TheWaterCooledCeramicBreeder(WCCB)blanketwhosestructuralmaterialismainlymadeofReducedActivationFerritic/Martensitic(RAFM)steel,isoneofthecandidateconceptualblanketdesign.AnanalysisofrippleanderrorfieldinducedbyRAFMsteelinWCCBisevaluatedwiththemethodofstaticmagneticanalysisintheANSYScode.Significantadditionalmagneticfieldisproducedbyblanketanditleadstoanincreasedripplefield.Maximumripplealongtheseparatrixlinereaches0.53%whichishigherthan0.5%oftheacceptabledesignvalue.Simultaneously,oneblanketmoduleistakenoutforheatingpurposeandtheresultingerrorfieldiscalculatedtobeseriouslyagainsttherequirement.

  • 标签: 纹波 误差 感应场 毛毯 马氏体钢 磁场分析
  • 简介:Anti-androgentherapyistheleadingtreatmentforadvancedprostatecancerandiscommonlyusedforneoadjuvantoradjuvanttreatment.Bicalutamideisanon-steroidalanti-androgen,usedduringtheinitiationofandrogendeprivationtherapyalongwithaluteinizinghormone-releasinghormoneagonisttoreducethesymptomsoftumor-relatedflaresinpatientswithadvancedprostatecancer.Assideeffects,bicalutamidecancausefatigue,gynecomastia,anddecreasedlibidothroughcompetitiveandrogenreceptorblockade.Additionally,althoughnotascommon,drug-inducedliverinjuryhasalsobeenreported.Herein,wereportacaseofhepatotoxicitysecondarytobicalutamideuse.Typically,bicalutamideinducedhepatotoxicitydevelopsafterafewdays;however,inthiscase,hepaticinjuryoccurred5moaftertreatmentinitiation.Basedonthisrarecaseofdelayedliverinjury,werecommendcarefulmonitoringofliverfunctionthroughoutbicalutamidetreatmentforprostatecancer.

  • 标签: Bicalutamide DRUG-INDUCED LIVER INJURY PROSTATE NEOPLASM
  • 简介:WemodeltheeffectsofweakfluctuationsontheprobabilitydensitiesandnormalizedpowersofvortexmodelsfortheBessel–Gaussphotonbeamwithfractionaltopologicalchargeintheparaxialnon-Kolmogorovturbulencechannel.Wefindthatprobabilitydensityofsignalvortexmodelsisafunctionofdeviationfromthecenterofthephotonbeam,andthefartherawayfromthebeamcenteritis,thesmallertheprobabilitydensityis.Forfractionaltopologicalcharge,theaverageprobabilitydensitiesofsignal/crosstalkvortexmodesoscillatealongthebeamradiusexceptthehalf-integerorder.Asthebeamwaistofthephotonsourcegrows,theaverageprobabilitydensityofsignalandcrosstalkvortexmodesgrowtogether.Moreover,thepeakoftheaverageprobabilitydensityofcrosstalkvortexmodesshiftsoutwardfromthebeamcenterasthebeamwaistgetslarger.Theresultsalsoshowthatthesmallerindexofnon-Kolmogorovturbulenceandthesmallergeneralizedrefractive-indexstructureparametermayleadtothehigheraverageprobabilitydensitiesofsignalvortexmodesandloweraverageprobabilitydensitiesofcrosstalkvortexmodes.Lower-coherenceradiusorbeamwaistcangiverisetolessreductionofthenormalizedpowersofthesignalvortexmodes,whichisoppositetothenormalizedpowersofcrosstalkvortexmodes.

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  • 简介:Thenasogastrictube(NGT)hasbecomeafrequentlyuseddevicetoalleviategastrointestinalsymptoms.Nasogastrictubesyndrome(NTS)isanuncommonbutpotentiallylife-threateningcomplicationofanindwellingNGT.NTSischaracterizedbyacuteupperairwayobstructionduetobilateralvocalcordparalysis.Wereportacaseofa76-year-oldmanwithNTS,inducedbyanindwellinglongintestinaltube.Hewasadmittedtoourhospitalfortreatmentofsigmoidcoloncancer.Heunderwentsigmoidectomytoreleaseabowelobstruction,andhadalongintestinaltubeinsertedtodecompresstheintestinaltract.Hepresentedacutedyspneafollowingprolongedintestinalintubation,andbronchoscopyshowedbilateralvocalcordparalysis.TheNGTwasremovedimmediately,andtracheotomywasperformed.Thepatientwasfinallydischargedinafullyrecoveredstate.NTSbeconsideredinpatientscomplainingofacuteupperairwayobstruction,notonlywithaNGTinsertedbutalsowithalongintestinaltube.

  • 标签: Nasogastric TUBE SYNDROME Nasogastric TUBE LONG
  • 简介:OurexperimentsshowthatexternalfocusingandinitiallaserenergystronglyinfluencesfilamentgeneratedbythefemtosecondTi–sapphirelaserinair.Theexperimentalmeasurementsshowthefilamentlengthcanbeextendedbothbyincreasingthelaserenergyandfocallengthoffocusinglens.Ontheotherhand,theplasmafluorescenceemissioncanbeenhancedbyincreasingthelaserenergywithfixedfocallengthordecreasingthefocallength.Inaddition,thecollapsedistancemeasuredexperimentallyarelargerthanthecalculatedonesowingtothegroup-velocity-dispersioneffect.Inaddition,wefindthatthelinewidthsofthespectrallinesfromN2isindependentoffilamentpositions,laserenergiesandexternalfocusing.

  • 标签: FEMTOSECOND LASER FILAMENT FLUORESCENCE
  • 简介:AIM:Toestimatethepotentialsystemiceventsduringandafterretinopathyofprematurity(ROP)screening.METHODS:Aprospectiveanddescriptivedesignedstudywasconductedtodetectthephysiologicandpathologicalchanges24hbefore,during,and72hafterROPscreening.Controlbloodpressure(BP),saturation,pulserate,andbodytemperaturewereroutinelytakenatvarioustimeinternalsbeforeandafterscreening.Adverseeffectspertaintocardiovascularsystem,respiratorysystem,gastricsystem,urinarysystemandnervoussystemwereretrospect0-72hafterROPscreeningata24-hourinterval.RESULTS:Totally1254prematuritybabiesreceivingROPscreeningduringJan.1st2013toDec.31th2013wereenrolledinoursurvey.Comparedtocontrolvitalsigndatatakenbeforetheexamination,therewasafluctuationinthediastolicBPwiththeincreased3.03mmHg(P=0.04)after3dosesofmydriaticdrops.Immediatelyaftertheexamination,therewasafurther12.64mmHg(P<0.01)increaseinsystolicBPanda7.24mmHg(P<0.01)indiastolicBP.Themeanpulserateduringexaminationwas22.4bpm(P<0.01)higherthanthe133.3±9.0bpmcontrollevel.Theoxygensaturationsharedanaveragedropof5%(P<0.01)duringscreening.Inprematuritywithpostconceptionalagelessthan31wk,theincidenceofapnea(23.5%),necrotizingenterocolitis(NEC)(8.7%),gastricresidual(25.4%)andupperdigestivetracthemorrhage(6.4%)alsodemonstratedasignificantrise(P<0.01).CONCLUSION:Inourstudysample,ROPscreeningwasassociatedwithNEC,gastricresidualandupperdigestivetracthemorrhage.Thesegastrointestinalsideeffects,alongwithbreathactivitypatternchangeandvitalsignsindicatorsfluctuation,mayberesultsofadditionalstressresponses.

  • 标签: retinopathy of PREMATURITY PREMATURITY SCREENING APNEA
  • 简介:Thelaser-inducedrelativisticshockwavesaredescribed.Theshockwavescanbecreateddirectlybyahighirradiancelaserorindirectlybyalaseraccelerationofafoilthatcollideswithasecondstaticfoil.Aspecialcaseofinterestisthecreationoflaser-inducedfusionwherethecreatedalphaparticlescreateadetonationwave.Anovelapplicationissuggestedwiththeshockwaveorthedetonationwavetoigniteapre-compressedtarget.Inparticular,thedeuterium–tritiumfusionisconsidered.Itissuggestedthatthecollisionoftwolaseracceleratedfoilsmightserveasanovelrelativisticacceleratorforbulkmaterialcollisions.

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  • 简介:Exercise-inducedrhabdomyolysis(exRML),apathophysiologicalconditionofskeletalmusclecelldamagethatmaycauseacuterenalfailureandinsomecasesdeath.IncreasedCa2+levelincellsalongwithfunctionaldegradationofcellsignalingsystemandcellmatrixhavebeensuggestedasthemajorpathologicalmechanismsassociatedwithexRML.TheonsetofexRMLmaybeexhibitedinathletesaswellasingeneralpopulation.PreviousstudieshavereportedthatpossiblecausesofexRMLwereassociatedwithexcessiveeccentriccontractionsinhightemperature,abnormalelectrolytesbalance,andnutritionaldeficienciespossiblegeneticdefects.However,theunderlyingmechanismsofexRMLhavenotbeenclearlyestablishedamonghealthprofessionalsorsportsmedicinepersonnel.Therefore,wereviewedthepossiblemechanismsandcorrelatedpreventionofexRML,whileprovidingusefulandpracticalinformationfortheathleteandgeneralexercisingpopulation.

  • 标签: Acute renal failure Calcium(Ca2+) CREATINE KINASE
  • 简介:Basedon6-hourlysensibleheatfluxandlatentheatfluxfromtheNCEPClimateForecastSystemReanalysis(CFSR)andcirculationdatafromtheJapanese25-yearReanalysis(JRA-25),theinitialdevelopingprocessoftropicalcycloneMindulle(1005)in2010hasbeendiagnosedtorevealtheimpactofair-seainteractionovertheSouthChinaSea(SCS)onthegenesisofitsincipientvortex.TheresultsshowthattheincipientvortexfirstoccurredeastoftheLuzonIslandon0000UTC20August,suggestingthatthetopographicforcingoftheLuzonIslandforeasterlywindsoverthewesternPacificmightbeoneofthefactorsresponsiblefortheformationoftheincipientvortex.Duringtheformationstageoftheincipientvortex,strongsoutheasterliesovertheSCScausedwarmwaterofthemiddleandeasternSCStoflowtowardtheLuzonIslandduetoEkmantransportresultingfromwindstress,leadingtoanincreaseoftheseasurfacetemperatureandsensibleheatfluxintotheatmosphere.Althoughtheanomaloussensibleheatingfavoredsurfacepressuretoreduce,itwasnotconducivetotheincreaseoflocalvorticityassociatedwiththevortexabovetheheatingareabecause,accordingtotheatmosphericthermaladaptationtheory,theanticyclonicvorticitywouldbecreatedinthelowertroposphereduetothedecreasedverticalgradientofthesensibleheating.However,theascendingmotionsoccurredovertheeasternareaoftheanomaloussensibleheatingduetotheaugmentationofthevorticityadvectionwithincreasingheight,causingwatervaportocondenseinthemiddleanduppertroposphere.Inturn,cyclonicvorticitywasgeneratedinthelowertroposphereduetotheincreasedverticalgradientofthecondensationlatentheating,resultingintheformationandfurthergrowthoftheincipientvortex.Therefore,thevorticitycreationduetothecondensationheatingplayedadominantroleduringthesubsequentenhancingstageoftheincipientvortex.

  • 标签: TROPICAL CYCLOGENESIS AIR-SEA interaction incipient VORTEX
  • 简介:ByemployingtheNCEP/NCARreanalysisdatasets(1000to10hPa,2.5°×2.5°),thethermalforcingimpactsareanalyzedofaneasterlyvortex(shortenedasEV)overthetropicaluppertroposphereonthequasi-horizontalmovementoftheWesternPacificSubtropicalAnticyclone(shortenedasWPSA)during22-25June2003.Therelevantmechanismsarediscussedaswell.Itisshownthatthedistributionandintensityofthenon-adiabaticeffectneartheEVresultintheanomalouseastwardretreatoftheWPSA.TheWPSAprefersextendingtothecolderregion,i.e.,itmovestowardtheregioninwhichthenon-adiabaticheatingisweakeningorthecoolingisstrengthening.DuringtheWPSAretreat,theapparentchangesofnon-adiabaticheatingillustratethecharacteristicsofenhancedcoolingintheeastsideoftheEV.Meanwhile,thecoolinginthewestsideexhibitsaweakenedeastwardtrend,mostprominentlyat300hPainthetroposphere.Theevidenceonthefactorscausingthechangeinthermalconditionisfound:themostimportantcontributiontotheheating-ratetrendistheverticaltransportterm,followedinturnbythelocalchangeintheheatingratetermandthehorizontaladvectionterm.Asaresult,theatmosphericnon-adiabaticheatinggeneratedbytheverticaltransportandlocalchangediscussedaboveismainlyconnectedtotheretreatoftheWPSA.

  • 标签: diagnostic analysis easterly vortex(EV) east-west shift of the Western Pacific Subtropical Anticyclone(WPSA) non-adiabatic heating