简介:目的:研究右美托咪定用于全麻下行胃癌根治术后躁动的镇静效果。方法:选择60例因胃癌需行全胃癌根治术的病人随机分为右美托嘧定组(D组)和安慰剂组(C组),每组30例。患者选用静脉复合全身麻醉,D组于术毕前半小时泵注右美托嘧定0.6μg/kg,10分钟泵完。C组以同样方式泵注生理盐水。术毕待患者呼吸恢复,清醒拔管。监测记录患者入室后(T0),拔管前(T1),拔管时(T2),拔管后5min(T3)、拔管后15min(T4)时的术中心率(HR)、平均动脉压(MAP),记录手术结束至拔管的时间,观察患者手术后躁动的次数和程度。结果:①两组患者性别、年龄、体质量、手术时间无显著差异。②C组T1,T2,T3,T4时间点MAP、HR值与T0比较有明显差异(P〈0.05)。D组各时间点较T0无明显变化,D组HR,MAP较C组明显降低(P〈0.05),③D组的拔管时间较C组长(P〈0.05)。D组的躁动发生率明显低于C组(P〈0.05)。结论:术毕前半小时泵注右美托咪定(10分钟泵完)可显著减少手术后躁动的发生,减少手术后呼吸抑制发生的可能性,保障了患者术后的安全。
简介:<正>19–24October2014SingaporeCONFERENCETHEMESTheoverallaimoftheICHDConferenceistoprovideaforumforparticipantsfromaroundtheworldtoreview,discussandpresentthelatestdevelopmentsinthebroaddisciplineofhydrodynamicsandfluidmechanics.ThefirstInternationalConferenceonHydrodynamics(ICHD)wasinitiatedin1994inWuxi,China.Sincethen,9moreICHDconferenceswereheldsubsequentlyinHongKong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,ShanghaiandStPetersburg.EvidentlytheICHDconferencehasbecomeanimportanteventamongacademics,
简介:为了提高图像插值的恢复效果,提出了一种基于图结构正则化稀疏表示的双层伯格曼迭代算法.该迭代算法的外层用于约束图像观测数据,内层用于更新图像块的学习字典和稀疏表示系数.引入的图结构正则化稀疏表示约束可以有效地自适应图像块的局部结构,对于严重受损的情形也能得到精确的恢复结果.此外,在内层迭代中改进的稀疏表示和简洁的字典更新策略使算法能快速地趋于收敛.数值实验结果表明,所提出的算法可以有效地恢复图像,在主观视觉效果和客观量化标准上要优于目前已有的算法.更多还原
简介:<正>Theconceptof"purity"and"pollution"existsineveryethnicgrouporculture,andtheemergenceandexistenceofthisconceptiscloselyassociatedwithgeographicenvironment,religiousbelief,modeofproduction,lifestyle,moralsandworldoutlook,andissupportedandrestrictedbyawholesetofculturallogicshiddendeeplyinthesocialstructure.Differentethnicgroupsandcultureshavedifferentcriteriaforclassificationof"purity"and"pollution".Onearticle,behaviororsocialphenomenonmaybedeemed"pure"byoneethnicgroup,but"polluted"byanother.Thehumanperceptionof"purity"isa
简介:基于采用不规则三角网格和有限体积方法的FVCOM模式,建立廉州湾三维潮流数值模型来重现廉州湾及周边海域的潮位和潮流变化状况。根据模拟结果计算得到了较以往更为精细的廉州湾及周边海域K1、O1和M2分潮的同潮图,并计算了由此三个分潮引起的潮汐不对称的变化情况。K1和O1分潮在廉州湾外主要以驻波的形式存在,进入廉州湾后转化为前进波;M2分潮在廉州湾外主要以前进波的形式存在,进入廉州湾后前进波特征更为明显。K1和O1分潮流在廉州湾外以旋转流为主,在廉州湾内以往复流为主;M2分潮流在整个研究海域以往复流为主。由潮余流场的分布特点可以看出自南向北由外海进入廉州湾的潮余流,在冠头岭处分为两支,一支逆时针转向西,另一支被冠头岭阻挡在其南侧形成顺时针封闭环流。在廉州湾内部同时存在两个环流系统,湾顶的气旋式环流和口门处的反气旋式环流。
简介:CorrosionbehaviourandbiofoulingcharacteristicsofmildsteelinthreedifferentcoastallocationsintheGulfofMannar,Indiahavebeenstudiedoveraperiodof24months.OysterfoulingwaspredominantatOpensea-Tuticorin,whilebarnaclefoulingwasdominantatbothMandapamandHarbour-Tuticorin.Therateofcorrosionfor24monthsexposureperiodwashighestatMandapam,wherefoulingwasminimal.Thesurfaceofthemildsteelwascharacterizedbyetchings&crevicesbeneaththehardfoulersattachedonit,atallthetestlocations.ThedepthofcrevicecausedbyhardfoulerswashigheratOpensea-TuticorinfollowedbyHarbour-TuticorinandMandapam.ThelossinultimatetensilestrengthwasmoreinOpensea-Tuticorinthantheothertwolocations.Corrosionbehaviourofmildsteelisdiscussedbasedonthevariationinthebiofoulingassemblageatthethreetestlocations.
简介:Strongrestrictionsonemissionsfrommarinepowerplants(particularlySOx,NOx)willprobablybeadoptedinthenearfuture.Inthispaper,acombinedsolidoxidefuelcell(SOFC)andsteamturbinefuelledbynaturalgasisproposedasanattractiveoptiontolimittheenvironmentalimpactofthemarinesector.TheanalyzedvariantofthecombinedcycleincludesaSOFCoperatedwithnaturalgasfuelandasteamturbinewithasingle-pressurewasteheatboiler.ThecalculationswereperformedfortwotypesoftubularandplanarSOFCs,eachwithanoutputpowerof18MW.Thispaperincludesadetailedenergyanalysisofthecombinedsystem.Massandenergybalancesareperformednotonlyforthewholeplantbutalsoforeachcomponentinordertoevaluatethethermalefficiencyofthecombinedcycle.Inaddition,theeffectsofusingnaturalgasasafuelonthefuelcellvoltageandperformanceareinvestigated.Ithasbeenfoundthatahighoverallefficiencyapproaching60%maybeachievedwithanoptimumconfigurationusingtheSOFCsystem.Thehybridsystemwouldalsoreduceemissions,fuelconsumption,andimprovethetotalsystemefficiency.
简介:从中国福建沿海某一污染滩涂的沉积物中筛选到一株具有较强拮抗水产病原菌的生防细菌LHB02。采用通用引物,对LHB02的16SrRNA片段进行扩增,获得1511bp的DNA系列,基于该DNA系列,结合细菌形态学、生理生化特征,鉴定LHB02为一株枯草芽孢杆菌。对LHB02进行了抗菌试验、抗菌谱检测和发酵条件优化研究,结果表明,LHB02对哈维氏弧菌、溶藻弧菌、鳗弧菌等有很强的拮抗作用,其优化后的发酵条件为:KB培养基(蛋白胨20g,丙三醇10mL,K2HPO41.5g,MgSO4.7H2O1.5g,H2O1000mL);温度28°C,pH值7.0,培养时间36h,接种量1.5%。
简介:Inthenormaloperationcondition,aconventionalsquare-rootcubatureKalmanfilter(SRCKF)givessufficientlygoodestimationresults.However,ifthemeasurementsarenotreliable,theSRCKFmaygiveinaccurateresultsanddivergesbytime.ThisstudyintroducesanadaptiveSRCKFalgorithmwiththefiltergaincorrectionforthecaseofmeasurementmalfunctions.Byproposingaswitchingcriterion,anoptimalfilterisselectedfromtheadaptiveandconventionalSRCKFaccordingtothemeasurementquality.Asubsystemsoftfaultdetectionalgorithmisbuiltwiththefilterresidual.Utilizingaclearsubsystemfaultcoefficient,thefaultysubsystemisisolatedasaresultofthesystemreconstruction.Inordertoimprovetheperformanceofthemulti-sensorsystem,ahybridfusionalgorithmispresentedbasedontheadaptiveSRCKF.Thestateanderrorcovariancematrixarealsopredictedbythepriorifusionestimates,andareupdatedbythepredictedandestimatedinformationofsubsystems.Theproposedalgorithmswereappliedtothevesseldynamicpositioningsystemsimulation.TheywerecomparedwithnormalSRCKFandlocalestimationweightedfusionalgorithm.ThesimulationresultsshowthatthepresentedadaptiveSRCKFimprovestherobustnessofsubsystemfiltering,andthehybridfusionalgorithmhasthebetterperformance.Thesimulationverifiestheeffectivenessoftheproposedalgorithms.
简介:<正>Sincethe1980s,tourismhasbecomeaworldwidecommodityforconsumptionandanindispensablepartofmodernlife.TibetAutonomousRegion(TAR)withitsuniquegeographyandculturallandscapeattractsannuallythousandsoftourists.TherecentaccelerationintheconstructionofTibet’sinfrastructureinthefieldsofhighwaysanddevelopedaviationtransport,andespeciallybytheopeningofthe2006Qinghai-Tibetrailway,havenewopportunitiesfortourismopenedinTibet,whosenumberofdomesticandforeigntouristsreached8.5millionpeoplein2011,withatotaltourismincomeof9.5
简介:高校教师学术论文在国际期刊的发表具有重要意义,然而聚焦个人写作经历的实证研究较少。本文通过一项长期跟踪研究,探讨西部高校一位青年教师产出及发表英文学术论文的过程。数据包括各阶段文稿、采访、通信与非正式讨论。研究发现我国学者在学术文章发表中面临不对等的话语权力,但个人能够能动地克服困难,进入并逐渐获得国际主流学术社会的参与和认同。研究特别阐明阿彻(Archer)的观点,即参与者作为自主反思性的实践者,通过自身努力获得"中心"学术界合法边缘性参与。
简介:Theprogressofeconomicglobalization,therapidgrowthofinternationaltrade,andthemaritimetransportationhasplayedanincreasinglysignificantroleintheinternationalsupplychain.Asaresult,worldwideseaportshavesufferedfromacentralproblem,whichappearsintheformofmassiveamountsoffuelconsumedandexhaustgasfumesemittedfromtheshipswhileberthed.Manyportshavetakenthenecessaryprecautionstoovercomethisproblem,whileothersstillsufferduetothepresenceoftechnicalandfinancialconstraints.Inthispaper,thebarriers,interconnectionstandards,rules,regulations,powersources,andeconomicandenvironmentalanalysisrelatedtoships,shore-sidepowerwerestudiedineffortstofindasolutiontoovercomehisproblem.Asacasestudy,thispaperinvestigatesthepracticability,costsandbenefitsofswitchingfromonboardshipauxiliaryenginestoshore-sidepowerconnectionforhigh-speedcraftscalledAlkaherawhileberthedattheportofSafaga,Egypt.Theresultsprovidethenationalelectricitygridconceptasthebesteconomicalselectionwith49.03percentofannualcostsaving.Moreover,environmentally,itcouldachieveanannualreductioninexhaustgasemissionsofCO2,CO,NOx,P.M,andSO2by276,2.32,18.87,0.825and3.84tons,respectively.
简介:<正>Glasgow,UK18th-20thAugust2014AbouttheconferenceTheconferencewillbringtogetherresearchers,practitionerstoaddressthesafetyandreliabilityissuesasapplicabletodifferentstagesintheanalysis,designconstructionandin-servicelifeofmarinestructuressuchasship,offshore,submergedstructuresandtherenewableenergystructures.Thiswillinvolveadvancedanalysisbothforstrengthandloadmodelinordertoestablishsafetylevelbothfordeterministicmodel(WSDmethod)andforreliabilitybaseddesign(LRFDmethod).Oneoftheaimsofthedesignshouldbetoachieveadequatebutnotexcessivelevelofsafetywhichcanbesatisfiedthroughreliabilitybasedmethodandthistakesintoaccountuncertaintiesofdesignvariables.CurrentmoderncodesaretryingtoprovidedesignproceduresonLRFDformatalthoughnoexplicitreliabilityanalysisisdonetoarrivethesepartialsafetyfactors.Thisconferencewilldealwithalltheseissuesandseehowthesetechniquesareappliedtovarioustypesofmarinestructures.Glasgow,thevenueforthisconferenceisacitywhichhaslotofattractions.TheworldfamousLoch-LomondisonlyfewmilesawayandEdinburghis50minutesjourneybytrain.Thecitywillalsohostthe2014CommonwealthGames.