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500 个结果
  • 简介:BackgroundNoncompactionofventricularmyocardium(NVM)isararetypeofprimarycardiomyopathy.Thediseaseiscausedbythedisorderinthedensificationofthemyocardiumintheearlystageoftheembryoprocess.Themorphologicalcharacteristicsareprojectingtrabeculationintheventricleandthedeeptrabecularspaceinterlinkedwithventricularchamber.Inrecentyears,manystudieshavefoundthattheleftventriculargrowthassociatedgeneticmutationiscloselyrelatedtotheoccurrenceofNVM.Themostclinicalmanifestationssuchasheartfailure,thromboembolismandarrhythmiaarespecific.EchocardiographyisthemostcommonlyusedtechniqueforthediagnosisofNVM.Cardiaccomputedtomography(CT)scan,cardiacmagneticresonanceimagingandleftventricularangiographyareotherimportanttechniquesforitsdiagnosis.TheNVMpatientshavealongcourseofdisease,poorprognosisandahighrateofmisdiagnosis.Thisarticlereviewstheresearchprogressintheaspectsofepidemiologicalcharacteristics,geneticcharacteristics,clinicalmanifestations,pathophysiology,diagnosis,treatmentandsoon,inordertoprovidethebasisforthediagnosisandtreatmentofNVM.

  • 标签: 致密化 心肌病 计算机断层扫描 诊断方法 发育相关基因 流行病学特征
  • 简介:ECOLOGYTheoriesandStrategiesofDegradedWetlandEcosystemRestorationCuiLijuan,ZhaoXinsheng,ZhangYan,ZhangManyin,LiWeiWangYifei,LiShengnan(ResearchInstituteofWetland,ChineseAcademyofForestry,Beijing100091,P.R.China).WorldForestryResearch,2011,24(2):1-4.

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  • 简介:Split-phase current differential protection has excellent capability of fault phase selection no matter whether the fault occurs on the same line or cross over lines.,under-reaching distance protection will not overreach when fault occurs at the end of line or the beginning of the next line after series capacitor.,The whole protection scheme for double-circuit lines on the same tower consists of split-phase current differential protection or split-phase composite distance carrier protection and zero-sequence directional comparison protection as main protection

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  • 简介:TheWorldAssociationofSedimentationandErosionResearch(WASER)establishedtheAwardfordistinguishedcontributionstosedimentresearchin2004.ThisawardistoprovideinternationalrecognitionfordistinguishedcontributionstothesedimentstudiesthroughoriginalandilluminatingresearchpaperspublishedintheInternationalJournalofSedimentResearch.Sevenpaperspublishedin2004-2009havebeenawardedthedistinguishedcontributionsawardin2007and2010.Aselectioncommittee,consistsof7scientistsfrom6counties,wasestablishin2012,whichscreened125paperpublishedinInternationalJournalofSedimentResearchduring2010-2012.Copiesof15papersintheshortlistweresenttomembersofthecommitteeandeachmemberwasrequestedtorecommend3papersfortheaward.ThevotingforthedistinguishedcontributionsawardstartedfromNovember1,2012viaemail.Allmembersoftheselectioncommitteehavereadthepapersandvotedfortheawardbasedonscientificmeritsofthesepapers.UptoJanuary10,2013,allthesevenmembershavesentbacktheirvotes,andtheresultsarethereforevalid.Thefollowing

  • 标签: 泥沙 国际期刊 研究论文 沉积物 启发性
  • 简介:ThewetlandtourisminChinahasbeenoneofthemostpopulartourismsasitsfastgrowthinChinainrecentyears.Thesignificanceofthewetlandtourismresearchforthelocalsustainabledevelopmentwasnoticedandhavesummarizedthisreviewin3aspects:resources,includingassessment,resourcesandproductsdevelopment;planning,includingtheorientationofwetlandtourism,thelandscapeplanningandapplicationofscienceandtechnology;andmanagement,includingtourismcapacity,environmentalevaluation,theecologicalcompensationandthepublicparticipation.ThewetlandtourismresearchinChinaisinsufficientinthefollowingfields:thedepthofextensivestudies,theapplicationofmathematics,theobjectiveplanningandtheevaluationofecologicalinfluence.Whatshouldbemorenoticedinthefutureresearchisthatitisconsideredaslandscapeecology,landscapeplanningandtherelevantwetland-structurecontrolling,theenvironmentandlandscapepatternchangecausedbytourism,tourismriskevaluation,theeconomicsandsociologyresearchinwetlandtourism.

  • 标签: 中国 湿地旅游 自然环境 旅游资源 旅游开发 发展战略
  • 简介:BaosteelTechnicalResearch,aquarterlyjournal,whichisissueddomesticallyandabroad,isrunandsponsoredbyBaosteelGroupCorporation.BaosteelTechnicalResearchmainlyreportstheachievementsintechnologicalinnovation,academicresearch,newproductdevelopmentandindustrialequipmentimprovementbyBaosteel.Itwillcontinuetofollowuponhottopicsandservethecompany'stechnologicaldevelopmentandprogress.Itsreadersincludeexpertsinsteelmetallurgyandrelatedfields,technicians,managementstaff,professorsandstudentsinuniversitiesandcolleges.It

  • 标签: 技术人员 宝钢集团 学术研究 钢铁冶金 耐火材料 新产品开发
  • 简介:Theinfluenceofdiffuserparameters,includingtheriserspacing,portnumberinariser,injectionangle,portarrangement,etc.,onthesurfaceinitialdilutionisexperimentallyinvestigated.Therelativedensitydifferencebetweentheeffluentandtheseawaterinthemodelisthesameasthatintheprototype,andtheeffectofthecrosscurrentissimulatedbyaninversemodeltechnique.Basedontheresultanalysis,thearrangementwithmoreportsinariserandlargerriserspacingissuggestedtosaveconstructioncost.TherelationshipbetweentheReynoldsnumberbasedontheportdiameterandvelocity,andthesurfaceinitialdilutionisalsoexplored,andthecriticalReynoldsnumberisproposed.

  • 标签: SEWAGE DIFFUSER MODEL TEST
  • 简介:Byanalyzingthethreshold-jumpingofSchmittcircuits,thispaperindicatesthatthecoreelementrealizingthisfunctioninbinaryTTLSchmittcircuitsisthedifferentialcurrentswitchwithcontrollablethreshold.Basedonthecharacteristichavingtwokindsofsignal-detectionthresholdinternaryTTLcircuits,aternaryTTLSchmittcircuithavingtwicereactionsofthreshold-jumpingisdesigned.ThesimulationwithPSPICEprovesthatthedesignedcircuithasidealfunctionofSchmittcircuits.

  • 标签: SCHMITT CIRCUIT Multiple-valued LOGIC TTL CIRCUIT
  • 简介:伍德composites能通常在三部分被分类:把压成薄片的composites,混合composites和渗透的composites。每部分有它的自己的特征和罐头进一步被划分。这篇论文在中国介绍历史和木头composites的开发的国家。关于把胶水压成薄片的木材的研究是稀罕的,工业几乎不来到是。成就的一个伟人在混合composites被获得了,它是很好工业化的。scrimber上的许多研究被做了,中国研究人员正在寻找在中国开发scrimber工业的一个可行方法。中国研究人员也在学习木头塑料composites(世界和平理事会)花了那么多精力,但是它一直不由于高费用是工业化的。

  • 标签: WOOD COMPOSITES RESEARCH ADVANCE China
  • 简介:BaosteelTechnicalResearch,aquarterlyjournal,whichisissueddomesticallyandabroad,isrunandsponsoredbyBaosteelGroupCorporation.BaosteelTechnicalResearchmainlyreportstheachievementsintechnologicalinnovation,academicresearch,newproductdevelopmentandindustrialequipmentimprovementbyBaosteel.

  • 标签: BAOSTEEL TECHNICAL Research TECHNOLOGICAL INNOVATION New
  • 作者: Liao Yue
  • 学科: 建筑科学 > 建筑技术科学
  • 创建时间:2021-04-08
  • 出处:《科学与技术》 2020年第36期
  • 机构:Abstract:In recent years, the process of Agricultural Mechanization in China has been gradually accelerated. Micro tractor has been favored by more and more users for its convenient and fast performance advantages. With the continuous expansion of micro tractor market share, the traditional performance of the tractor has been more and more unable to keep up with the needs of the majority of farmers, research and development of a simple structure, cost-effective micro electric tractor, to meet the actual needs of small-scale agricultural production such as fields, vegetables and fruit greenhouses will become more and more necessary.
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  • 简介:Yttriastabilizedzirconia(YSZ)haswidelybeenusedaselectrolyteinsolidoxidefuelcell(SOFC).ThemicrostructureofYSZrelatedtothefabricationprocesswasdiscussedinthepaper.WithYSZnano-powdersabout40-100nmasrawmaterial,theYSZadobewasmanufacturedbytapecalenderingprocess.Thenamedthree-stepsinteringprocesswasperformedat1000℃for2h,thenraisedthetemperaturewithnormalrateandassoonasupto1400℃,thefurnacewascontrolledat1250-1300℃for10-20h.ThehighdenseYSZswiththerelativedensityof96%-99%wereobtained;thegrainsizeofYSZcouldbereducedto0.5-3μm.Theaboveresultisbenefitedtoco-firedintheelectrode-supportedSOFCs.

  • 标签: YTTRIA STABILIZED ZIRCONIA (YSZ) ELECTROLYTE SINTERING
  • 简介:Shen Guorong. RESEARCH ON PRINCIPLE OF DPFC DIRECTIONAL RELAY. AUTOMATION OF ELECTRIC POWER SYSTEMS.1983,Shen Guorong. RCS-978 DIGITAL TRANSFORMER PROTECTION SET. AUTOMATION OF ELECTRIC POWER SYSTEMS.2000,Zheng Yuping. LFP-915 DIGITAL BUSBAR PROTECTION SET. AUTOMATION OF ELECTRIC POWER SYSTEMS.2000

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  • 简介:Withtheincreasingimportanceofoceanexploitation,providinganti-rollingstabilityforshipsatanchorhasbecomemoreandmoreimportant.Thelift-generationtheoryoftraditionalfinstabilizersisbasedonincomingflowvelocity,whichisnotsuitableforexplainingliftgeneratedatanchor.Weanalyzednon-steadyflows,withforcesonfinstabilizersgeneratedbynon-incomingflowvelocityconditions,andgaveanewlift-generationmodel.Thecorrectnessofthemodelwasprovenbycomparingexperimentalresultsoffinstabilizermotionundernon-incomingvelocityconditionsfromthefluidcomputationsoftwarewiththatfromtheemulatorofthelift-generationmodel.Finally,themodelwasusedinananti-rollingsystemonashipandthereductionofrollwasmuchbetterthanwhatcouldbeachievedbypassiveanti-rollingtanks.

  • 标签: 轮船 抛锚 反向旋转 模拟
  • 简介:Inthispaperthreemethods(diluteacidpretreatment,aqueousammonia/diluteacidpretreatmentandalkalinepretreatment)wereusedtostudythehydrolysisofcornstoverandcharacteristicsofeachmethodwerecompared.Theresultsshowedthattheligninremovalratewas71.8%whenthecornstoverwastreatedwithacausticsodasolutioncontaining1.5%ofNaOH,atatemperatureof75℃for90minwithaninitialsolid-liquidratioof1:8(w/v).HydrolysisyieldoftheNaOHpretreatedsamplereached78.5%,whichwasmuchhigherthanothercontrolgroups.Theseresultsareusefulforevaluationofpretreatmenttechnologies,andidentificationofkeyfactorsthatlimitcellulosehydrolysis,andcanalsoserveasabasisfordesigningandscreeningappropriatepretreatmenttechnologies.

  • 标签: 纤维素水解 玉米秸秆 预处理技术 糖化 酸预处理 氢氧化钠
  • 简介:FORESTCERTIFICATIONHighConservationValueForestsTheory,PracticeandFutureTendencyDongKe,DengHuafeng(ForestryCollegeofBeijingForestryUniversity,Beijing100083,China),WorldForestryResearch,(2007)20(5):7-11.

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  • 简介:HitachiInformationSystemsstarteduptheRFIDbusinessfrom2002andprovidesvarietiessolutions,especiallydevotedtheenergiesontheresearchofmetallictagandthedevelopmentofitsappliedarea.Themetallictagwasdevelopedtowithstandtheharshenvironmentlikevibration,shock,high-pressurewaterinjection,highvoltage,andultravioletirradiation.Becausethemetallictagthatdifferentwiththemetaltagcreatedbefore,isprotectedbythemetallicmaterialthatmadeitverystrongtobeusedintheenvironmentlistedabove.June,2006,ourcompanysuccessfullydevelopedthemetallictagwitharmor-cladstainlesssteel.Therefore,comparingwiththeresintag,themetallictagwithremarkablemechanicalstrengthwassufficientattentiontowithstandtheoutdooruse,eventoresistUV.Bythemethodofscrewfixing,rivettightening,solderingornailstriking,theinstallationprocedurecanbecompleted.Becausethevariousinstallationmethodsweresupported,themetallictagcanbeappliedtomanyindustryareas.Themanagementmarketslikeconstructionmachinery,substationequipment,molds,tools,andmetalliccontainerthatneedtheverystrongtagcanbedeveloped,becauseofthemetallictag.Inthisthesis,itwillbedescribedabouttheresearchbackgroundandtheresearchresultsofmetallictag,thecommercializedmetallictag’sfeaturesandapplicationfields,aswellastheresearchsubjectsinthefutureandrecentdevelopmentsituation.

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