简介:Thesolidaddofthefirstprotonatedzincoborophosphate,(H3O)Zn(H2O)2BP2O8·H2O(1),wassoventothermallysyn-thesizedbythereactionofZn(NO3)2·6H2OandH3BO3withH3PO4inamixedsolvent,andstructurallycharacterizedbysingle-ystalX-raydiffractionanalysis.ItcrystallizesinthehexagonalP6122,a=0.9604(4)nm,c=1.5297(6)nm,V=1.2218(8)nm^3,Dc=2.921g/cm^3,Z=6,F(000)=1080,μ=3.495mm^-1.Thestmchwefeaturesthatthetetrahedra-te-trahedrahdlcesinterconnectedbyoctahedraandstronghydro-gembondinteractionsformathree-dimensionalframework.Theprotonatedwatermoleculesarelocatedatuniquepositions.othercharacterizationsbyIRandthermalanalysisarealsode-scribed.
简介:Weestablishseveralfundamentalidentities,includingrecurrencerelations,degreeelevationformulas,partitionofunityandMarsdenidentity,forquantumBernsteinbasesandquantumBeziercurves.WealsodeveloptwotermrecurrencerelationsforquantumBernsteinbasesandrecursiveevaluationalgorithmsforquantumBeziercurves.Ourproofsusestandardmathematicalinductionandotherelementarytechniques.
简介:针对液压仿真转台伺服系统的非线性特点,提出了一种模糊控制与局部积分控制相结合的复合控制方式.当系统的偏差较大时主要采用模糊控制器对系统的偏差进行快速调节以加快系统的响应过程;当系统的偏差小于某一值时,加入积分控制以保证系统的精度.为了提高模糊控制器的性能,采用了规则可调整的模糊控制器.实验结果表明:该方法能有效地克服液压伺服系统的非线性和参数的不稳定性以及外部干扰对系统的影响,具有较高的控制精度和鲁棒性能,完全适合于液压仿真转台伺服系统的控制.
简介:ThispapershowsthatforΩ∈H1(Sn-1),MarcinkiewiczintegraloperatorμΩisLp(Rn)boundedfor1<p<∞,whichimprovessomeknownresults.
简介:Inthispaper,westudythehomogeneouspolynomialsorthogonalwiththeweightfunctionh(x(d))=x2k11green.Itissimplerthantheformulain[2],andcanberegardedasanextensionof[1]undertheweightedcase.
简介:Givennon-negativeintegersm,n,handkwithm≥h>1andn≥k>1,an(h,k)-bipartitehypertournamentonm+nverticesisatriple(U,V,A),whereUandVaretwosetsofverticeswith|U|=mand|V|=n,andAisasetof(h+k)-tuplesofvertices,calledarcs,withatmosthverticesfromUandatmostkverticesfromV,suchthatforanyh+ksubsetsU_1∪V_1ofU∪V,Acontainsexactlyoneofthe(h+k)!(h+k)-tupleswhoseentriesbelongtoU_1∪V_1.Necessaryandsufficientconditionsforapairofnon-decreasingsequencesofnon-negativeintegerstobethelosingscorelistsorscorelistsofsome(h,k)-bipartitehypertournamentareobtained.
简介:本文根据河北医科大学运用中药青风藤提取物青藤碱治疗患系膜增生性肾小球肾炎的SD大鼠的最新实验数据,采用多元统计分析的Fisher判别法.对该实验剥模过程、治疗效果进行判别分析,从统计意义上讲,该实验制模是成功的,青藤碱的治疗效果与常用药物雷公藤多苷一样比较显著.