简介:AfterthereleaseofthepreviousreporttotheCommitteeonSpaceResearch(COSPAR)onprogressachievedbyChinesescientistsinionosphericresearches(LiuLBandWanWX,2016),intherecenttwoyears(2016–2017)manyinterestingnewinvestigationsintovariousionosphericrelatedissueshavebeencompleted.Inthisreport,about100publicationsaresummarized.Thetopicshighlightedareasfollows:Ionosphericspaceweather,ionosphericdynamics,ionosphericclimatologyandmodelling,ionosphericirregularityandscintillation,GlobalNavigationSatelliteSystem(GNSS)relatedionosphericissuesandothertechniques,andradiowavepropagationintheionosphere.AnoutstandingfeatureisthatmoreandmoreobservationsfromtheMeridionalProjectsupportedtheionosphericinvestigations.
简介:ToanalyzethegenomicmolecularstructureandgenotypeofhumanastrovirusisolatedfrominfantinGuangzhouofChina,theprimersweredesignedbasedonthegenomicsequenceofastrovirusfromtheGenBankandthetargetsequencewereamplifiedbyRT-PCR.ThenthePCR-productswereclonedtoTvectorandsequenced.ThegenomicnucleotidesequenceswereanalyzedbytheprogramsCLUSTALWandDNASTAR.ItwasfoundthatthefullgenomiclengthofHASTVgz01strainwas6721bpandtheORFswere6558bp.The5'and3'UTRwere82and81nucleotides.Thegenomeincluded3openreadingframes(ORFs):ORF1a,ORF1bandORF2.The5'-terminalORF1astartedatnucleotide83andextendedtonucleotide2845.ORFlb(nt2785tont4332)overlapedORFlaby61nucleotides.The3'-terminalORF2beganatnucleotide4325andterminatedatnucleotide6640.ORF2had2316nucleotides.ComparedwithotherastrovirussequencesinGenBank,thehomologyoftheaminoacidsequenceofORF2ofHASTVgz01strainwiththatofserotype4was93%.Homologywithotherserotypesrangedfrom61%to70%.ThecompletenucleotidesequenceofastrovirusHASTVgz01strainisolatedfromGuangzhouinChinawas6721bpinlength,GenBankaccessionNO.DQ344027.ComparingtheORF2ofastrovirusHASTVgz01withtheknownsequencesoftypes1-8thehighesthomologywasserotype4(93%).ComparativesequenceanalysisoftheHASTVgz01ORF2withthereportedhumanastrovirussequencesrevealedthattheisolatedastrovirusbelongstogenotype(serotype)4.
简介:摘要:本文主要研究6F.01联合循环机组的热力性能,在此基础上分析朗肯循环热力性能,提出目前影响朗肯效率主要的两个因素为6F.01联合循环机组蒸汽压力以及温度的观点。数据显示如果改变循环机组的蒸汽压力值和温度,朗肯循环效率会随之改变,呈正相关,这一发现为后续优化同类属性的机组蒸汽组参数提供一定的理论依据。