简介:Consideringtheclass(n,m)oforderedtreeswithmleavesandn-minternalnodes,asetofgeneratingfunctionsareestablishedforthefollowingproblems:(1)thetotalnumbernodeswithdegreeroverΓ(n,m),(2)thetotalpathlengthofnodesoverΓ(n,m),and(3)thetotalnumberofnodesoverΓ(n,m)onlevelk.Someparticularcountingfomulasarederivedfromthem.
简介:AredsoilderivedfromQuaternaryredclaywasemployedtostudynutrientleachingwithwoilcolumnsrepackedinlaboratory,TheobjectivewastoidentifytheeffectsoffertilizationpracticesonleachingpatternsandmagnitudesofCa^2+,Mg^2+,K^+,NH4^+,andNO3^-,ThetreatmentswereCK(asacontrol),CaCO3,CaSO4,MgCO3,Ca(H2PO4)2,urea,KCl,andmultiple(amixtureoftheabove-mentionedfertilizers),Thefertilizerswereaddedtothebaresurfaceofthesoilcolumns,andthenthecolumnswereleachedwith120mLdeionizedwaterdailythroughperistalticpumpsoveraperiodof92days.LeachingprocessesofNH4^+,andNO3^-wereonlymeasuredinCK,ured,andmultipletreatmentswhichweredirectlyrelatedtoNleaching,ResultsshowedthatsoleapplicationofCaSO4,andCa(H2PO4)2scarcelyhdanyeffectonthelechinglossesofCa^2+,Mg^2+,andK^+;theapplicationofMgCO3sthimulatedtheleachingofMg^2+;theapplicationofCaCO3promotedtheleachingofCa^2+,Mg^2+andK^+;ureatreatmentalsopromotedtheleachingofK^+andNH4^+,andNO3^-leachingmainlyoccurredatlatestageofleachingprocessinparticular;underKCltreatment,leachingofCa^2+,Mg^2+,andK^+waspromotedtoalargeextent;undermultipletreatment,leachingofCa^2+,Mg^2+,K^+,NH4^+,andNO3^-wasallincreasedandNO3^-wasmainlyleachedattheendofleachingprocessandstillhadatrendofincrease.
简介:(VNE)虚拟网络嵌入是网络虚拟化的必要部分,它为未来网络被看作最有希望的方法之一。它的主要对象是高效地分配一个虚拟网络(VN)的节点和到一个分享的底层网络(SN)的连接。NP难、退出的研究提出了几个启发式的算法。然而,大多数算法仅仅考虑节点的本地资源,例如中央处理器和带宽(BW),到决定嵌入,并且忽略网络属性的重要影响。基于全部网络的属性,在每个节点之间的连接的一个模型被提出测量节点,和一个新二阶段的嵌入算法评价的资源被建议。此后,印射的节点和印射的连接能联合被考虑。当减少运行时刻时,广泛的模拟证明建议算法由增加VN请求的收入/费用比率和接受比率改进VNE的性能。