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简介：1.IntroductionLetGbeafinitegroup.ForaCayleysubsetSofGnotcontainingtheidentityelement1,theCayley(di)graphX~Cay(G,S)ofGwithrespecttoSisdefinedasthedirectedgraphwithvertexsetV(X)=GandedgesetE(X)={(g,sg)IgEG,s6S}.IfS=S--’,thentheadjacencyrelationissymmet...

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简介：Spacesymmetryofprehnite,whichoccursincavitiesandveinswithinSkarnfromtheTieshanironmineraldeposit,Daye,Hubeiprovince,CentralChina,hasbeendeterminedusingselectedareaelectrondiffraction(SAED)andconvergent-beamelectrondiffraction(CBED)onthesubmicrometerscale.OurresultsconfirmthatthenaturalprehnitemayhavethestructurewithsymmetryPncm.Theunit-cellparametersofinvestigatedprehnite(a=0.458nm,b=0.555nm,andc=1.853nm)havebeencalculatedbyusingthemulticrystaldifiractionringsofgold,theinternalstandard.

简介：BackgroundInresponsetotheevolutionofscienceandtechnologyfromcompartmentalizationtoreunification,thestudyofcomplexsystemsandmulti-scalemethodologyhasreceivedincreasingattentionfromvariousscientificdisciplinesandengineeringfields,somuchsothatcomplexityhassometimesbeencalledthescienceofthe21stcenturywithmulti-scalemethodologyasanaccompanyingchallenge.

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简介：本文在指出先行研究中有关“副词的连体修饰”的问题的同时，把“副词+N+ノ+N”这一结构形式作为考察对象，通过大量实例调查，首先对其中各要素的内容构成进行了详细的分析，并在此基础上重点围绕副词与名词的结构和语义关系问题进行了具体深入的论述，从而得出了客观、明确的结论。

简介：由于新教材中数学知识体系的调整，使得高等数学知识体系与初等数学知识体系进一步接轨，高等数学的一些思维方式、方法也在中学中得到广泛的应用．本文就谈谈由《高等代数》中行列式初等性质变换思维联想、归纳得出中学习题中出现的n×m阶数列方阵解题通法，供大家参考．

简介：Aseriesofaromaticimineswerereducedtocorrespondingaminesinexcellentyieldsby2-phenyl-N,N-dimethylbenzimidazoline(PDMBI)photochemicallyinthepresenceofmagnesiumperchloride(Mg(ClO4)2).AMg2+mediatedphotoinducedelectrontransfermechanismwasproposed.

简介：用非线性分析的方法讨论了方程N（t）=N（t）[a（t）-∑ni=1bi(t)Ni(t-τi（t）)]的周期正解的存在性，所获结果包含或推广了已有的几上结论[2，3]。

简介：通过一种取代剂将N-乙基-α-萘胺生产中副产品N,N-二乙基-α-萘胺转化产品N-乙基-α-萘胺.经试验考查了温度、时间以及反应物配比对转化反应收率的影响,确定了最佳操作条件:温度165℃,时间4小时,物料配比1:5(摩尔比).转化反应的总收率为78.4%.由于副产品N,N-二乙基-α-萘胺的转化利用,使N-乙基-α-萘胺产品收率由68.9%提高至84.3%。

简介：“招工象选美、招聘如考研”，劳动力市场的这种人才高消费现象已成为不争的事实。科技信息年代，用人单位招聘强调学历、经验，本无可厚非，但在年龄要求上也要架设一道藩篱，却成了众多求职者难以逾越的障碍。时下，劳动力人才市场盛行的“35岁现象”就是最好的例证。

简介：牛顿的重复为单个Toeplitz矩阵的组逆的计算被修改。在每次重复，重复矩阵被一个矩阵与一个低排水量等级接近。因为重复矩阵的排水量结构，涉及牛顿的重复的thematrix向量增加能高效地被做。我们证明修改牛顿重复的集中仍然是很快的。数字结果被介绍表明建议方法的快集中。

简介：LetGbeanonabelianfinitegroup.ThenIrr(G/G′)isanabeliangroupunderthemultiplicationofcharactersandactsonthesetofnon-linearirreduciblecharactersofGviathemultiplicationofcharacters.Thepurposeofthispaperistoestablishsomefactsabouttheactionoflinearcharactergrouponnon-linearirreduciblecharactersanddeterminethestructuresofgroupsGforwhicheitheralltheorbitkernelsaretrivialorthenumberoforbitsisatmosttwo.Usingtheestablishedresultsonthisaction,itisveryeasytoclassifygroupsGhavingatmostthreenomlinearirreduciblecharacters.

简介：JiangxiZhengbangGroupCompany,Ltd.willconstructa200kt/aaceticacidunitinYima,Henanprovince.Thisunitwilladopttheadvancedmethanoloxo-synthesistechnologybasedonmethanolandcarbonmonoxideasthefeedstocksfeaturinglowinvestment,lowcost,lowenergyconsumptionandlowcontamination.Yimacityhasabundantcoalresources,andthecapacityofexistingmethanolunitsandmethanolunitsunderconstructionwillreach540kt/a.

简介：Threemethodsofextractingtheinformationofanomaliesofaprecursorygroupareputforward,i.e.,themathematicalanalysesofthesyntheticinformationofearthquakeprecursors(S),theinhomogeneousdegreeofprecursorygroups(ID)andthevaluesofshort-termandimpendinganomalyinnear-sourcearea(NS).Usingthesemethods,wecalculatetheobservationaldataofdeformation,undergroundfluidandhydrochemicalconstituentsobtainedfromdifferentseismicstationsintheSichuan-YunnanregionandconcludethatthesyntheticprecursoryanomaliesofasinglestrongearthquakewithMs6.0differgreatlyfromthoseofthegroupedstrongearthquakes,fortheanomalousinformationofprecursorygroupsaremoreabundant.ThethreemethodsofextractingthesyntheticprecursoryanomalyandtherelatednumericalresultscanbeappliedintothepracticeofpredictiontothegroupedstrongearthquakesintheSichuan-Yunnanregion.Inhomogeneousdegree(ID)ofsyntheticprecursoryanomalycanbeidentifiedautomaticallybecauseittakesthethresholdofdistributivecharacteristicsoftheanomaliesofprecursorygroupasitscriterionforanomaly.

简介：Proceedingfromtheeigenvalueequationofthenormalmodeinhomogeneousshallowwater,wederiveseveralformulaecalculatingthemodeattenuationandgroupvelocity,andcomparetheiraccu-racybymeansofnumericalresults.Thepaperespeciallydiscussestheattenuationandthegroupve-locityofcriticalmodeinaPekerischannelandshowsthatingeneral,theattenuationandthegroupvelocityofthecriticalmoderespectivelyarelessthantheabsorptionandthesoundspeedinthebot-tom.Therefore.theKornhauser,Raney,WestonTindle‘sconclusionsaremodifiedthattheattenuationandthegroupvelocityofthecriticalmodeareexactlyequaltotheabsorptionandthesoundspeedinthebottom,respectively.

简介：从西方学界有关这一术语的部分定义入手。从中抽取其普遍的要素进行应用性的分析，将这一术语的含义和应用限定于人类社全“族类”共同体范畴，井通过图式化的说明，就西方国家释义和应用这一术语的情况进行了辨识，以期为该术语在“本土化”(族群)过程中如何理解其含义和怎样把握其应用的边界提供一个可供参考的背景。

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