简介:ThispapereonsidersanARIMA(p,d,q)medel.Amethodforestimatingtheorderdandtestingthehypothesis:d=d0isgiven.Theasymptoticpropertiesoftheestimatorhavebeendiscussed.
简介:从古代汉语到现代汉语,“与其P,不如q”句式经历了一个较长时间的主观化过程。说话人视角的调整对该句式主观化的贡献最大,其次是说话人的情感和认识。说话人的视角由“当事人视角”向“说话人视角”转换,说话人的情感主要通过“不如”前加评注性副词和P、q后加评说成分来实现,而说话人的认识是指该句式的表达由客观描述向主观认识转变。
简介:InthispaperL^p-L^qestimatesforthesolutionu(x,t)tothefollowingperturbedhigh-erorderhyperbolicequationareconsidered,(ρπ--a△)(ρπ--b△)u+V(x)u=O,x∈R^n,n≥6,ρ1eu(x,O)=O,ρ^3eu(x,O)=f(x),(j=O,1,2).WeassumethattheotentialV(x)andtheinitialdataf(x)arecompactlysupported,andV(x)issufficientlysmall,thenthesolutionu(x,t)oftheaboveproblemsatisfiesthesameL^p-L^qestimatesasthatoftheunperturbedproblem.