学科分类
/ 3
41 个结果
  • 简介:TheestablishmentoftheEAEUwillhavebroadstrategicimplicationsfortheEurasiancontinentandtheworld.IthashelpedRussiaconsolidateitssphereofinfluenceinthepost-Sovietspaceandstrengtheneditsroleasapoleintheworld.ItwillalsoexertawideinfluenceontheEurasianregionaleconomicstructure,thegeographicaleconomiccompetitionbetweenRussiaandtheWest,andthirdparties’influenceintheregion.

  • 标签: 联盟 世界 经济 吉尔吉斯斯坦 白俄罗斯 哈萨克斯坦
  • 简介:TheboominuseofprivatemilitarycompaniesiscloselylinkedtotheU.S.globalstrategicblueprintaswellastothecontemporaryinclinationtowardoutsourcing,theambiguityininternationallaw,andtoday'smilitaryinsurgencies.Asnationsandseparatistgroupscontinuetheirobjectivesinsecret,thecompaniestheyhirecontributetothreatstonationalsovereignty,distortthecriteriaforlegalaccesstowar,violatehumanrights,hamperpredictionsforconflictoutcomes,andcreateregulatorychaos.

  • 标签: 国际安全 军工企业 民营 非战争军事行动 传统观念 武装冲突
  • 简介:Inthispaper,theinfluenceofElNi?oeventontheMadden-JulianOscillation(MJO)overtheequatorialPacificisstudiedbyusingreanalysisdataandrelevantnumericalsimulationresults.ItisclearlyshownthatElNi?ocanreducetheintensityofMJO.ThekineticenergyofMJOovertheequatorialPacificisstrongerbeforetheoccurrenceoftheElNi?oevent,butitisreducedrapidlyafterElNi?oeventoutbreak,andtheweakenedMJOevencancontinuetothenextsummer.Theconvectionoverthecentral-westernPacificisweakenedinElNi?owinter.ThepositiveanomalousOLRoverthecentral-westernPacifichasoppositevariationinElNi?owintercomparingtothenon-ENSOcases.TheverticalstructureofMJOalsoaffectedbyElNi?oevent,sotheoppositedirectionfeaturesofthegeopotentialheightandthezonalwindinupperandlowerleveltropospherefortheMJOarenotremarkableintheElNi?owinterandtendtobebarotropicfeatures.ElNi?oeventalsohasaninfluenceontheeastwardpropa-gationoftheMJOtoo.DuringElNi?owinter,theeastwardpropagationoftheMJOisnotsoregularandunanimousandthereexistssomeeastwardpropagation,whichisfasterthanthatinnon-ENSOcase.DynamicanalysessuggestthatpositiveSSTA(ElNi?ocase)affectstheatmosphericthicknessovertheequatorialPacificandthentheexcitedatmosphericwave-CISKmodeisweakened,sothattheintensityofMJOisreduced;thecombiningofthebarotropicunstablemodeintheatmosphereexcitedbyexternalforcing(SSTA)andtheoriginalMJOmaybeanimportantreasonfortheMJOverticalstructuretendingtobebarotropicduringtheElNi?o.

  • 标签: 厄尔尼诺事件 赤道太平洋 MJO ENSO 垂直结构 强度降低
  • 简介:IntheapplicationofRNAitechnology,itisanessentialsteptodesignsiRNAapplicabletotargetgene.Atpresent,therearemanyresearchesandconclusionsonsiRNAdesign.ThispaperaimstotheinfluencesofmRNAsecondarystructureorsiRNAantisense-strandsecondarystructureonsiRNAsilenceefficiency.Thepaperalsodiscussestheproblemsandsetsoutfurtherinsightsintheresearch.

  • 标签: MRNA二级结构 SIRNA设计 RNA沉默 RNAI技术 靶基因 反义链
  • 简介:AIMToinvestigatetheinfluenceofprotonpumpinhibitors(PPIs)exposureonthediagnosisofHelicobacterpylori(H.pylori)gastritisandintestinalmetaplasia.METHODS:ChronicPPIuseisassociatedwithmaskingofH.pyloriinfection.PatientswithH.pyloriinfectionarepredisposedtogastricandduodenalulcers,andlong-terminfectionwiththisorganismhasbeenassociatedwithgastricmucosalatrophyandseriouslong-termcomplications,suchasgastriclymphomaandadenocarcinoma.ThreehundredpatientsdiagnosedwithgastritisbetweenJanuary2008andApril2010wereincludedinourstudy.Thecomputerizedmedicaldatabaseofthesepatientswasreviewedretrospectivelyinordertoassesswhetherthetypeofgastritisdiagnosed(H.pylorivsnon-H.pylorigastritis)isinfluencedbyPPIexposure.H.pyloridensitywasgradedaslow,ifcorrespondingtomilddensityfollowingtheUpdatedSydneySystem,orhigh,ifcorrespondingtomoderateorseveredensitiesintheUpdatedSydneySystem.RESULTS:Patientswereequallydistributedbetweenmalesandfemaleswithamedianageatthetimeofdiagnosisof50yearsold(range:20-87).ThehistologicaltypesofgastritiswereclassifiedasH.pylorigastritis(n=156,52%)andnon-H.pylorigastritis(n=144,48%).Allpatientswithnon-H.pylorigastritishadinactivechronicgastritis.PatientswithnopreviousPPIexposureweremorelikelytobediagnosedwithH.pylorigastritisthanthosewithpreviousPPIexposure(71%vs34.2%,P〈0.001).Intestinalmetaplasiawasmorelikelytobedetectedinthelatterpatients(1.4%vs6.5%,P=0.023).MultivariateanalysishasalsodemonstratedthatinthepresenceofpreviousPPIexposure(OR=0.217,95%CI:0.123-0.385),GERD(OR=0.317,95%CI:0.132-0.763,P=0.01),alcoholintake(OR=0.396,95%CI:0.195-0.804,P=0.01),thedetectionofH.pyloriwaslesslikely.ChronicuseofPPIsmaymaskH.pyloriinfectionspromotingthediagnosisofnon-H.pylorigastritisandleadstoasi

  • 标签: GASTRITIS Diagnosis HELICOBACTER PYLORI PROTON pump
  • 简介:Thermalstresscaninducebirefringenceinalasermedium,whichcancausedepolarizationofthelaser.Thedepolarizationeffectwillbeverysevereinahigh-average-powerlaser.Becausethedepolarizationwillmakethefrequencydoublingefficiencydecline,itshouldbecompensated.Inthispaper,thethermalcharacteristicsoftwokindsofmaterialsareanalyzedinrespectoftemperature,thermaldeformationandthermalstress.Thedepolarizationresultfromthermalstresswassimulated.Depolarizationonnon-uniformpumpingwasalsosimulated,andthecompensationmethodisdiscussed.

  • 标签: DEPOLARIZATION DEPOLARIZATION COMPENSATION THERMAL BIREFRINGENCE
  • 简介:AIM:Tocomparetheconjunctivalepithelialtoxicitiesofthreenewer-generationfluoroquinoloneswithoutpreservatives.·METHODS:Inaprospective,randomized,doubleblindcomparativestudy,47eyesof47patientswithaprimarypterygiumwereenrolled,anddividedrandomlyintothreegroups(levofloxacin0.5%,gatifloxacin0.3%,andmoxifloxacin0.5%).Afterpterygiumsurgerywiththesameconjunctivalautografttechnique,eachpatientmaintainedaregimenwitharandomlyassignedfluoroquinoloneeyedrop.Patientswereexaminedeveryotherdayaftersurgeryuntiltheepitheliumhadcompletelyhealed.Photosweretakenandusedtomeasuretheareaofresidualepithelialdefects.Conjunctivalhealingtimeandspeed(initialdefectarea/healingtime(mm~2/d)comparedineachgroupusingKruskal-Wallistests.·RESULTS:Therewerenosignificantdifferencesinmeanage,gender,andconjunctivaldefectsizeofthedonorsitebetweenthesegroups.However,themeanofconjunctivalhealingtimeandspeedwerestatisticallydifferentineachgroup.Themeanofconjunctivalepithelialhealingtimewas8.93±2.69d(levofloxacingroup),10.31±2.96d(gatifloxacingroup),and13.50±4.10d(moxifloxacingroup),P=0.006.Themeanconjuctivalepithelialhealingspeedwas6.18±1.39mm~2/d(levofloxacingroup),5.52±1.68mm~2/d(gatifloxacingroup),and4.40±1.30mm~2/d(moxifloxacingroup),P=0.003.·CONCLUSION:Withouttheinfluenceofpreservatives,levofloxacinandgatifloxacinmightbelesstoxictotheregenerationofconjunctivalepithelialcellsandcauseafasterconjunctivalwoundhealingrelativetomoxifloxacin.

  • 标签: 结膜上皮的毒性 FLUOROQUINOLONE 防腐剂 PTERYGIUM
  • 简介:Theeffectofparticlesizedistributionofaluminahasbeeninvestigatedforsilica-freetabularaluminalowcementcastables(LCC).Threedifferentcombinationsofaluminahavebeenincludedinthematrixformulationofthecastables.Allthethreecombinationsarecomposedofabimodalreactivealuminaandafinegroundmonomodalreactivealumina.ThefirstA1andsecondA2combinationsarerespectivelycomposedofbimodalandmonomodalaluminasfromAlteo,withadifferentfine/coarseparticlesratioforthebimodalalumina.ThetwoAlteocombinationshavebeencomparedwithathirdcombinationCcomposedofabimodalcommerciallyavailablegradeandamonomodalcommerciallyavailablegrade.OptimizationofparticlesizepackinghasbeenperformedforthethreedifferentformulationsusingtheDingerandFunkmodel.Withthisoptimization,thetwoformulationsbasedonAlteomaterial(PFR,PBRandPFR40)achievethesamelevelofperformanceinapplicativetests(flowability,coldphysicalproperties,mechanicalresistance,crystallinephases,thermalshocksandcorrosion)asreferencesolutionsonthemarket.

  • 标签: 低水泥浇注料 活性氧化铝 耐火性能 粒度分布 LCC 双峰
  • 简介:Thedielectricbarrierdischarge(DBD)intheglowregimeinneonhasbeeninvestigatedbyexperimentandtwo-dimensional(2D)fluidmodeling.ThedischargewascarriedoutinaplanarDBDsystemwithsegmented-electrodesdrivenbysquare-wavevoltage.TheresultsshowthattheglowDBDoriginatesinthecenteroftheelectrodeandexpandsoutwardtotheelectrodeedgeduringeachhalfcycleofthevoltage,formingaradialstructure.Thedischargedecaysfirstlyintheinnerareabutsustainslongerintheedgearea,showingareverseddischargearea.Thedischargecannotcompletelycovertheentireelectrodesurface,butremainsaborderofnon-orweakdischarge.Thefluidmodelingshowsasimilarresultinagreementwiththeexperiments.Thesimulationsindicatethattheelectricfieldintheedgeareaisdistortedduetotheboundaryeffectsothattheelectricfieldandchargedistributionaredifferentfromthatintheinnerpart.Thedistortedfieldreducesthelongitudinalcomponentneartheedgeandcausesthelocalfieldtobelowerthanthatinthecenter,andhencemakesthedischargebehindhand.Italsoinducesatransversefieldthatmakesthedischargeextendradiallyoutwardtotheedge.TheboundaryeffectplaysanimportantroleintheglowDBDstructure.

  • 标签: 电介质阻挡放电 边界效应 泄水建筑物 辉光 平面 电极表面