简介:ThespectrumoftheΣ(1193)excitedstates,Σ,withisospinI=1andstrangenessS=??1isoneofthemostimportantissuesinhadronicphysics.TheΣresonancesaremostlyproducedandstudiedinK-inducedreactions.ManyΣresonancesarenowcatalogedbytheParticleDataGroup[1].However,ourknowledgeoftheseresonancesisstillverypoor.Intheenergyregionbelow2GeV,onlyafewofthemarewellestablished,suchastheΣ(1385)ofspin-parityJP=3=2+,Σ(1670)ofJp=3=2??andΣ(1775)ofJp=5=2??.Theothersarenotwellestablishedandsomeofthemareevenoflargeuncertaintiesontheirexistence.Thus,thestudyoftheΣresonancewiththeavailableexperimentaldataisnecessary.
简介:<正>LetD={z∈:|z|<1}andφbeanormalfunctionon[0,1).Forp∈(0,1)suchafunctionφisusedtodefineaBergmanspaceA~p(φ)onDwithweightφ~p(|·|)/(1-|·|~2).Inthispaper,thedualspaceofA~p(φ)isgiven,fourcharacteristicsofCarlesonmeasureonA~p(φ)areobtained.Moreover,asanapplication,threesequenceinterpolationtheoremsinA~p(φ)arederived.
简介:Thepurposeofthepresentpaperistoevaluatetheerroroftheapproximationofthefunc-tionfL1[0,1]byKantorovich-BernsteinpolynomialsinLp-metric(0<p<1).
简介:InthispaperwestudytheconvergencenfaclassofmeansonHp(G)(0<p<1),themeanstaketheBochner-Rieszmeansin[1],thegeneralizedBochner-Rieszmeansin[2],andtheoperatorsTΦrin[3]asspecialcases.Weobtainweak-typeestimatesfortheassociatedmaximaloperatorsandthemaximalmeanboundednessforthemeans.
简介:Inthispaperwewillshowthatifanapproximationprocess{Ln}n∈Nisshapepreservingrelativetotheconeofallk-timesdifferentiablefunctionswithnon-negativek-thderivativeon[0,1],andtheoperatorsLnareassumedtobeoffiniterankn,thentheorderofconvergenceofDkLnftoDkfcannotbebetterthann2evenforthefunctionsxk,xk+1,xk+2onanysubsetof[0,1]withpositivemeasure.Takingintoaccountthisfact,wewillbeabletofindsomeasymptoticestimatesoflinearrelativen-widthofsetsofdifferentiablefunctionsinthespaceLp[0,1],p∈N.
简介:对[0,1]上的L—可积函数ф及α>0定义下列B—D—B算子;本文研究了Mna(ф,x)当α>0时,在LP(0,1](1≤p<+∞)的一致逼近;当α≥1时在LP[O,1]及L1P[0,1]逼近度的量化估计。作者在文[4]中定义了B—D—B算子:其中fnk(X)称为Bézeief基函数文[4]研究的是B—D—B称子在C[0,1]空间中的逼近性质,本文继续[4]的工作,专研究这个算子在LP[0,1](1≤P<+∞)的逼近性质,证明了Mna(фX)当α>0时在LP[0,1]中为一致逼近,并得到了当α≥1时在LP[0,1]及L1P[0,1]中逼近度的量化估计。
简介:摘要目的探讨lncRNA-C21orF96调控miRNA-875-5p和USF2基因表达促进胃癌细胞的侵袭和转移机制。方法采用RT-PCR技术检测胃癌细胞中与lncRNA-C21orF96相关的miRNA的含量;胃癌细胞KATO-Ⅲ经pcDNA3.1质粒过表达lncRNA-C21orF96,SGC-7901细胞经siRNA干扰lncRNA-C21orF96表达后,采用RT-PCR技术检测胃癌细胞中miR-875-5p和USF2基因表达量的变化;胃癌细胞MKN45过表达lncRNA-C21orF96后,采用Transwell实验观察细胞侵袭和迁移能力的变化。结果在胃癌细胞中,lncRNA-C21orF96与miR-875-5p值呈显著的相反关系,两者之间相对定量值差异具有统计学意义(SGC-7901细胞:21.19 ±1.09比3.28 ±0.06,P<0.01;SNU-16细胞:24.76±2.09比8.16 ±0.07,P<0.01);转染lncRNA-C21orF96表达载体的KATO-Ⅲ细胞中miR-875-5p表达显著下降而USF2基因表达升高(P<0.01);转染lncRNA-C21orF96干扰载体的SGC-7901细胞中miR-875-5p表达显著升高而USF2基因表达降低(P<0.05); lncRNA-C21orF96过表达后,实验组穿过人工基底膜的平均细胞数与对照组相比差异具有统计学意义[迁移实验:(216.19 ± 2.30)个比(89.19 ± 4.60)个,P<0.001;侵袭实验:(146.18 ±5.3)个比(59.18 ± 2.60)个,P<0.001]。结论LncRNA-C21orF96的过表达能显著调控miR-875-5p表达同时促进USF2基因表达,促进胃癌细胞的侵袭和转移。
简介:Inthispaper,simultaneousuniformapproximationandmeanconvergenceofquasi-HermiteinterpolationanditsderivativebasedonthezerosofJacobipolynomialsareconsideredseparately.Thedegreesofthecorrespondingapproximationsarerespectivelygivenalso.Someknownresultsareimprovedaudextended.