简介：TheauthorsfirstproveaconvergenceresultontheKacanovmethodforsolvinggeneralnonlineaxvafiationalinequalitiesofthesecondkindandthenapplytheKacanovmethodtosolveanonlinearvariationalinequalityofthesecondkindarisinginelastoplastieity.Inadditiontotheconvergenceresult,anaposteriorierrorestimateisshownfortheKacanoviterates.IneachstepoftheKacanoviteration,onehasa(linear)variationalinequalityofthesecondkind,whichcanhesolvedbyuaingaregularizationtechnique.TheKacanoviterationandtheregularizationtechniquetogetherprovideapproximationswhichcanbereadilycomputednumerically.AnaposteriorierrorestimateisderivedforthecombinedeffectoftheKacanoviterationandtheregularization.

简介：Inthispaperaclassoftheextendedsecondderivativeformulasispresented.Basedontheextendedk-stepsecondderivativeformulaanewpredictor-correctormethodcalledExtendedk-stepsecondDerivativeMethodforstiffsystemsisformulatedwiththek-stepsecondderivativeformulaasitsimplicitpredictor.Theextendedsecondderivativemethodshavethehigherordersandthebetterstabilityproperties.Thecomputationaleffortiscomparitivelylarge,butmuchofitcanbesaved,sothatthemethodsareacceptableandefficient.

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简介：TheresearchesonCriticalPeriodHypothesis(CPH)aimstoexplaintheimportanceoftheagefactorintheprocessoflearningasecondlanguage.Inthisessay,acriticalreviewofthetheoreticalissuesandempiricalresearchontheCPHwillspreadout.Meanwhile,thediscussionofimplicationandlimitationoftheCPHresearchwillbeconcernedaswell.

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简介：InthispaperweprovideaprobabilisticapproachtothefollowingDirichletProblem{(∑x4(αijxj)+∑bixi+ξ)u=0,iDu=g,onD,withoutassumingthattheeigenvaluesoftheoperator∑xi(αijxj)+∑bixi+ξwithDirichletboundaryconditionsareallstrictlynegative.TheresultsofthispapergeneralizedthoseofMa.

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简介：OnNovember18,2001,thesecondphasecofferdamofThreeGorgesProjectwasstartedtodismantle.Thedismantlementofcofferdamwithheightof80oddm,weircrestwidthof15mandoveralllengthof2.4km,marksthebeginningofthesecondtimecutoffofThreeGorgesProject—thecutoffofdiversion

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简介：Inthispaper,weareconcernedwiththenumericalsolutionofsecond-orderpartialdifferentialequations.WeanalysetheuseoftheSineTransformprecondilionersforthesolutionoflinearsystemsarisingfromthediscretizationofp.d.e.viathepreconditionedconjugategradientmethod.Forthesecond-orderpartialdifferentialequationswithDirichlelboundaryconditions,weprovethattheconditionnumberofthepreconditionedsystemisO(1)whiletheconditionnumberoftheoriginalsystemisO(m2)Heremisthenumberofinteriorgridpointsineachdirection.Suchconditionnumberproducesalinearconvergencerale.

简介：高黎贡山巨大的山脉紧贴在怒江西侧．南北横亘数百公里。这是60年前中国大军西行远征的路。除非你是亲历，否则没有人能想到，世界上还有如此艰险的战场。在这海拔3000多米的地方是第二次世界大战中海拔最高的战场。战时美国新闻处编写的《怒江战役》里把它称作“云层上的战斗”。

简介：Theasymptoticdistributionsareexactlysolvedforlinearlyindependentsolutionsconsideringproblemofthesecondorderandforthecoefficientsofasymptoticdistributiontherecurrentformulasareobtained.Further,usingobtainedrecurrentformulasthenecessaryandsufficientconditionsforalmostregularityofspectralproblemfortheequationofthesecondorderisproved.

简介：AbstractBackground:Preeclampsia (PE) is a serious complication that affects maternal and perinatal outcomes. However, the mechanisms have not been fully explained. This study was designed to analyze longitudinal gut microbiota alterations in pregnant women with and without PE in the second (T2) and third trimesters (T3).Methods:In this nested case-control study, which was conducted at Nanjing Maternity and Child Health Care Hospital, fecal samples from 25 PE patients (25 fecal samples obtained in T2 and 15 fecal samples obtained in T3) and 25 matched healthy controls (25 fecal samples obtained in T2 and 22 fecal samples obtained in T3) were collected, and the microbiota were analyzed using 16S rRNA gene sequencing. The diversity and composition of the microbiota of PE cases and controls were compared.Results:No significant differences in diversity were found between the PE and control groups (P > 0.05). In the control group, from T2 to T3, the relative abundances of Proteobacteria (median [Q1, Q3]: 2.25% [1.24%, 3.30%] vs. 0.64% [0.20%, 1.20%], Z = -3.880, P < 0.05), and Tenericutes (median [Q1, Q3]: 0.12% [0.03%, 3.10%] vs. 0.03% [0.02%, 0.17%], Z= -2.369, P < 0.05) decreased significantly. In the PE group, the relative abundance of Bacteroidetes in T2 was lower than in T3 (median [Q1, Q3]: 18.16% [12.99%, 30.46%] vs. 31.09% [19.89%, 46.06%], Z= -2.417, P < 0.05). In T2, the relative abundances of mircrobiota showed no significant differences between the PE group and the control group. However, in T3, the relative abundance of Firmicutes was significantly lower in the PE group than in the control group (mean ± standard deviation: 60.62% ± 15.17% vs. 75.57% ± 11.53%, t= -3.405, P < 0.05). The relative abundances of Bacteroidetes, Proteobacteria, and Enterobacteriaceae were significantly higher in the PE group than in the control group (median [Q1, Q3]: 31.09% [19.89%, 46.06%] vs. 18.24% [12.90%, 32.04%], Z=-2.537, P < 0.05; 1.52% [1.05%, 2.61%] vs. 0.64% [0.20%, 1.20%], Z=-3.310, P < 0.05; 0.75% [0.20%, 1.00%] vs. 0.01% [0.004%, 0.023%], Z = -4.152, P < 0.05). Linear discriminant analysis combined effect size measurements analysis showed that the relative abundances of the phylum Bacteroidetes, class Bacteroidia and order Bacteroidales were increased in the PE group, while those of the phylum Firmicutes, the class Clostridia, the order Clostridiales, and the genus unidentified Lachnospiraceae were decreased in the PE group; and these differences were identified as taxonomic biomarkers of PE in T3.Conclusion:From T2 to T3, there was an obvious alteration in the gut microbiota. The gut microbiota of PE patients in T3 was significantly different from that of the control group.

简介：InthispaperweintroducetheclassofHermite’smatrixpolynomialswhichappearasfiniteseriessolutionsofsecondordermatrixdifferentialequationsY"-xAY’+BY=0.AnexplicitexpressionfortheHermitematrixpolynomials,theorthogonalitypropertyandaRodrigues’formulaaregiven.

简介：Byusingtherefinementofthestandardintegralaveragingtechnique,weobtainsomeoscillationcriteriaforsecondordermixednonlinearellipticequations.Theresultsestablishedinthispaperextendandimprovesomeexistingoscillationcriteriaforhalf-linearPDEintheliterature.

简介：SameexistenceandmultiplicityofhomoclinicorbitforsecondorderHamiltoniansystem¨↑x-a（t)x+Wx(t,x)=0aregivenbymeansofvariationalmethods,wherethepotentialV(t,x)=-1/2a（t)|s|^2+W(t,s)isquadraticinsatinfinityandsubquadraticinsatzero,andthefunctiona（t)satisfiesthegrowthconditionlimt→∞∫t…t+la（t)dt=+∞，A↓ι∈R^1.

简介：ThesecondmeetingoftheMarcoPoloUrologicalAssociationhasbeenheldinWuhan(P.R.China)on5th-7thNovember,2010.Presidentsofthe'MarcoPoloAssociationofUrologyandJournalofContemporaryUrologicandReproductiveOncologyJoint-SymposiumonUrologicalandMaleReproductiveSystemCancer'havebeenProf.DarvinMelloniandProf.

简介：OnNovember13,thesubject'ResearchandDevelopmentofHardwareCompletedfor1000-kVACUltra-HighVoltageTransmissionProject:PartLineHardware'arrangedbyJiangsuElectricPowerCompanypassedtheacceptanceofanexpertgrouporganizedbytheStateGridCorporation.

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