简介：

简介：针对局域网交换机互联存在瓶颈的问题,结合工程实践,研究分析了交换机端口Trunk的基本原理,提出了使用端口Trunk的方法,提高了网络设备的使用性能.

简介：

简介：Thispaperaimstoconfirmtheoptimalpruningintensitytopromotepaulowniagrowth.Annualdynamicof8growthindicatorsforpruningofthree-year-oldPaulowniatopromotetnmkextensionweresimulatedunder7treatments.TheresultsshowedthatannualgrowthprocesscouldbemodeledreliablybyRichards'function.Eightgrowthparametersweredevelopedincludingfast-growingpoint(t0),initialpointoffast-growingperiod(tl),finalpointoffast-growingperiod(t2),fast-growingperiod(t),growthperiod(Dg),maximumdayincrement(AGRmax),maximumannualincrement(A).Effectsofpruningtopromotetrunkextensionongrowthparameterswereanalyzed.Paulowniaremaining3-6lowerbranchesafterpruninghadrelativelylongerfast-growingperiod(t),growthperiod(Dg),higheraveragedayincrement(Am),maximumdayincrement(AGRmax)andmaximumannualincrement(A).Therefore,lowerdiametergrowthoforiginaltrunkdidnotdecreasesignificantly,andupperdiametergrowthincreasedtosomeextent,Heightanddiametergrowthofgraftingtrunk,andformratioofgraftingtrunkwererelativelyhigher.Totalstockvolumeincrementwasimprovedsignificantlyundertheconditionthatstockvolumeincrementoforiginaltrunkdidnotdecrease.

简介：Extensiveaneurysmsinvolvingtheascendingaorta,aorticarch,andthedescendingaortastandasatherapeuticdilemmainsimultaneousmanagementofmultiplesitesofpathologyoftheaorticarchandthedescendingthoracicaorta.Wesystematicallyreviewedaboutliteraturesofstentedelephanttrunkoperation(SET)identifiedthroughsearchesoftheelectronicdatabasesEMBASEandMedline,andaimedtosummarizestudiesofpatientsundergoingSETforextensiveaneurysms.Since1996,KatoMintroducedahybridtechniquebyusingstentedgraftimplantationtothedescendingaortafortreatmentofthoracicaorticaneurysmordissection.Ithasbeendescribeagoodoptionforextensivethoracicaorticaneurysmsandinafashionsimilartotheelephanttrunktechnique.

简介：

简介：Araucariaangustifolia(Bertol.)O.Kuntzeexhibitsdimorphisminitsstemstructure,wherethetrunkisorthotropicandbranchesandbranchlets(primaryandsecondarybranches)areplagiotropic.Thesestemsexhibitdifferentbehaviorwhenusedforvegetativepropagation,andonlysegmentsoftrunkcanformacompleteplant.Thephysiologicalandbiochemicalmechanismsthatcharacterizethesestemsarestilllittleknown.Theaimofthisstudywastodescribethefreeaminoacidprofilesintrunks,branches,andbranchletsofA.angustifolia.Segmentsof5cminlengthwereexcisedfromyoungindividualsbelowthestemapex.Theneedleswereremovedandsampleswerefrozenandlyophilized.Thedeterminationsweremadebyhigh-performanceliquidchromatography,andtheresultswereexpressedaslg/gfreshweight(FW).Thetrunksandbrancheshadthehighestcontentoftotalaminoacids,whichwere112.23±20.57lg/gFWand111.97±27.78lg/gFW,respectively.Theaminoacids—glutamine,aspartateandc-aminobutyricacidandtyrosine—werenoticeablyhigherinthethreetypesofstems.Inthetrunk,ahigheramountofasparagineandtryptophan,wasalsodetected.Glutamicacidandglutaminewerefoundinhigherquantitiesinthebranches.Thebranchletshadverylowtotalaminoacidcontent(30.79±4.19lg/gFW),whereinasparagineistheonlyaminoacidnotdetected.Thus,itwasobservedthattheprofileofthefreeaminoaciddiffersamongtrunks,branches,andbranchletsinA.angustifolia,indicatingthattheyperformdifferentfunctions.

简介：

简介：目的：观察电针不同穴位对脑梗死偏瘫患者脑电的近期影响。方法：将脑梗死患者按2：1比例随机分为电针神经干组和常规电针组，分别予以针刺神经干及针刺常规穴位治疗，每目治疗1次，治疗14次后进行疗效评定。结果：电针神经干组较常规电针纽疗效好，近期脑电差异具有统计学意义（P〈0．05）。结论：电针神经干可明显改善偏瘫肢体的神经功能缺损及脑功能状况，疗效优于常规电针组。

简介：无

简介：无

简介：AbstractBackground:Aneurysm of basilar perforator was rarely reported in the literature. It is difficult to treat due to its small size and deep-seated location. Excessive treatment may cause complications that resulted from ischemic events of parent perforators. Therefore, it is important to make clinical strategy for such patients to improve the prognosis.Case presentation:One case, who presented as spontaneous subarachnoid hemorrhage, despite the negative result in computed tomography angiography firstly, was diagnosed angiographically as a ruptured aneurysm of the basilar perforator. A good clinical outcome of the case was achieved during the follow-up after conservative observation for 2 months, as well as the disappearance of previous lesion from angiography.Conclusions:Aneurysm located at perforator of basilar trunk was rare and difficult to treat. Conservative observation for certain cases with periodic angiography follow-up was considered in order to prevent the patients from potential iatrogenic effects.

简介：

简介：Purpose:Thepurposeofthisstudywastocomparethecoordinationbetweenthetrunkandthepelvisduringasustainedasymmetricrepetitiveliftingtaskbetweenagroupwithahistoryoflowbackpain(LBP;HBP)andagroupwithnohistoryofLBP(NBP).Methods:Volunteerslifteda11-kgboxfromankleheightinfronttoashelf45°off-centeratwaistheight,andloweredittothestartpositionat12cycles/minfor10min.Liftingsidewasalternatedduringthetrial.Continuousrelativephasewasusedtocalculatecoordinationbetweenthepelvisandtrunkrotationatthebeginning(Min1),middle(Min5),andendofthebout(Min9).Results:Whiletherewerenomaineffectsforgroup,asignificantinteractionbetweentimeandgroupindicatedthat,inthefrontalplane,theNBPgroupcoordinationwasmoreanti-phasetowardtheendofthebout,withnosuchdifferencesfortheHBPgroup.Analysisofsagittal-axial(bendandtwist)coordinationrevealedtheHBPgroupcoordinationwasmorein-phaseattheendoftheboutovertheentirecycleandfortheliftingphasealone,withnosuchdifferencesfortheNBPgroup.Conclusion:DifferencesbetweengroupsdemonstrateresidualconsequencesofLBPinanoccupationalscenario,eventhoughtheHBPgroupwaspain-freefor>6monthspriortodatacollection.Morein-phasecoordinationintheHBPgroupmayrepresentacoordinationpatternanalogousto'guardedgait'whichhasbeenobservedinotherstudies,andmaylendinsightastowhytheseindividualsareatincreasedriskforre-injury.

简介：BACKGROUND:Thestellateganglionblock(SGB)playsaprotectiveroleinfocalcerebralischemia/reperfusioninjury.ThehumanSGBcanbesimulatedbytransectionofthecervicalsympathetictrunk(TCST)inrats.OBJECTIVE:ToobservetheeffectsofTCSToninduciblenitricoxidesynthase(iNOS)levelsandcerebralinfarctvolumeinthehippocampusofratswithcerebralischemia/reperfusioninjury,andtoanalyzethemechanismofaction.DESIGN,TIMEANDSETTING:Acompletelyrandomized,controlled,neuropathologicalexperimentwasperformedattheInstituteofNeurologicalDisease,TaiheHospital,YunyangMedicalCollegebetweenMarchandSeptember2006.MATERIALS:Atotalof93Wistarrats,aged17-18weeks,ofeithergender,wereusedforthisstudy.2,3,5-triphenyltetrazoliumchloridewaspurchasedfromChangshaHongyuanBiologicalReagentCompany,China.RabbitiNOSantibodyandgoatanti-rabbitIgGantibodyweretheproductsofWuhanBosterBiologicalReagentCo.,Ltd.,China.METHODS:Tenratswererandomlyselectedforthesham-operatedgroup.Cerebralischemia/reperfusioninjurywasinducedbymiddlecerebralarteryocclusion(MCAO)usingthesuturemethodintheremainingrats.Fortysuccessfulratmodelswererandomlyandequallydividedintothefollowingtwogroups:(1)TCSTgroup:subsequenttoTCST,MCAOwasperformedfor2hours,followedby24hoursreperfusion;(2)modelgroup:ratsunderwentexperimentalproceduressimilartotheTCSTgroup,withtheexceptionofTCST.Ratsinthesham-operatedgroupweresubjectedtoexperimentalproceduressimilartothemodelgroup;however,thethreadwasonlyintroducedtoadepthof10mm.MAINOUTCOMEMEASURES:Following24hoursofreperfusion,functionalneurologicaldeficitswerescored.BraintissuesectionsfromtenratsofeachgroupwereusedtomeasurecerebralinfarctvolumebyTTCstaining.HippocampaltissuesectionsofanadditionaltenratsfromeachgroupwereusedtodetectiNOSlevelsusingthestreptavidin-peroxidaseimmunohistochemis

简介：BACKGROUND:Stellateganglionblock(SGB)playsaprotectiveroleonthebrain,buttheprecisemecha-nismofactionisnotclear.OBJECTIVE:TosimulateSGBbytransectionofthecervicalsympathetictrunk(TCST)andtoinvestigatetheTCSTeffectsonchangesincerebralinfarctvolumeandoxygenfreeradicallevelsinratswithfocalcere-bralischemia/reperfusioninjury.DESIGN,TIMEANDSETTING:AcompleterandomizedcontrolanimalexperimentwasperformedattheInstituteofNeurologicalDiseasesofTaiheHospital,YunyangMedicalCollegefromFebruarytoDecember2005.MATERIALS:Atotalof101healthyWistarrats,weighing280–320g,ofbothgenders,aged17–18weeks,wereusedinthisstudy.2,3,5-triphenyltetrazoliumchloride(TTC)waspurchasedfromChangshaHongyuanBiologicalCompany.Superoxidedismutase(SOD),malondialdehyde(MDA)andnitricoxide(NO)assaykitswereprovidedbyNanjingJianchengBioengineeringInstitute.METHODS:RatswererandomlydividedintoaTCSTgroup,amodelgroupandashamoperationgroup.Successfulmodelswereincludedinthefinalanalysis,withatleast20ratsineachgroup.AfterTCST,ratmodelsoffocalcerebralischemia/reperfusioninjurywereestablishedintheTCSTgroupbyreceivingmiddlecerebralarteryocclusion(MCAO)bytheintraluminalsuturemethodfor2hours,followedby24hoursofreperfusion.Ratmodelsoffocalcerebralischemia/reperfusioninjuryweremadeinthemodelgroup.Ratsintheshamoperationgroupunderwentexperimentalproceduresasforthemodelgroup,threadingdepthof10mm,andmiddlecerebralarterywasnotligated.MAINOUTCOMEMEASURES:BraintissuesectionsoftenratsfromeachgroupwereusedtomeasurecerebralinfarctvolumebyTTCstaining.BraintissuehomogenateofanothertenratsfromeachgroupwasusedtodetectSODactivities,MDAcontentsandNOlevels.Ratneurologicalfunctionwasassessedbyneu-robehavioralmeasures.RESULTS:CerebralinfarctvolumewasbiggerinthemodelgroupthanintheTCSTgr

简介：

简介：推荐最新实用技术资讯，帮助读者朋友开阔视野，做读者朋友的热心助手。欲了解更多资讯，请登陆中国涂装行业门户网站——《中国涂装》网，最新应用技术、技巧、设计方案、配方转让等行业资讯尽在掌握中。

简介：摘要：现代社会,电早已进入了人们生活和生产的各个领域,电气安全涉及到人们的切身利益,阐述了电气安全措施及安全用电常识,使人们都能重视电气安全问题。

简介：江苏：首条自主设计世界级工程船下水；法国：新型消防员个人安全保护装置系统；天津：首次采用排油注氮新灭火装置；天津：排水配备国内最先进抢险设备；加拿大：CL-215和CL-415两栖消防飞机；美国：扑灭大型油罐火灾专用炮；德国：研制出TreviraCS新型阻燃无毒面料；乌鲁木齐：首辆消防火灾勘查车亮相；Preso研制成功一款新型消防泵流量计；美国：远水能救近火消防飞机。