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：Inthispaperweproposedanovelexactfixed-nodequantumMonteCarlo(EFNQMC)algorithm,whichisaself-optimizingandself-improvingprocedure,IncontrasttothepreviousEFNQMCmethod,thetrialfunctionisoptimizedsynchronisticallyinthediffusionprocedure,butnotbeforethebeginningofEFNQMCcomputation.Inordertooptimizethetrialfunction,theimprovedsteepestdescenttechniqueisused,inwhichthestepsizeisautomaticallyadjustable.Theprocedureisquasi-Newtonandconvergessuperlinearly.Wealsouseanoveltrialfunction,whichhascorrectelectron-electronandelectron-nucleuscuspconditions.ThenovelEFNQMCalgorithmandthenoveltrialfunctionareemployedtocalculatetheenergiesof1^1A1stateofCH2,^1AgstateofC8andtheground-statesofH2,LiH,Li2,H2O,respectively.Thetestresultsshowthatboththenovelalgorithmandthetrialfunctionproposedinthepresentpaperareveryexcellent.

简介：瞄准：检验矩阵metalloproteinase-2(MMP-2)在胃的癌症纸巾并且到的表示与淋巴节点评估它的关系微转移。方法：作者从30学习了850淋巴结resected与淋巴腺切除术经历了胃切除术用的有胃的癌的病人颠倒抄写聚合酶链反应(RT-PCR)试金除了他染色。肿瘤纸巾的MMP-2表示被免疫检测组织化学的技术(EliVision加)。结果：MMP-2表示在21是积极的(70%)在9的盒子和negative(30%)盒子。没有重要关联在象年龄，性，肿瘤地点，肿瘤直径，Lauren分类和淋巴的侵略那样的MMP-2表示和另外的变量之间被发现。相反，MMP-2表示与肿瘤渗入的深度显著地相关(P=0.022)，淋巴节点转移(P=0.030)并且肿瘤区别(P=0.043)。淋巴节点微转移在77被检测(12.5%)14的淋巴节点(46.7%)胃的癌病人。MMP-2表示在12是积极的(85.7%)有淋巴节点的14个病人微转移，并且在9(56.3%)没有淋巴节点的16个病人微转移(P=0.118)。结论：我们的结果证明那MMP-2表情与肿瘤侵略，肿瘤区别和淋巴节点转移有重要关联。MMP-2表示可以是一个重要生物特征和胃的癌的重要预示的参数。我们也断定MMP-2可以参予淋巴节点的发展胃的癌的微转移。进一步的调查被需要得出一个结论。

简介：Thesingularhybridboundarynodemethod(SHBNM)isproposedforsolvingthree-dimensionalproblemsinlinearelasticity.TheSHBNMrepresentsacouplingbetweenthehybriddisplacementvariationalformulationsandmovingleastsquares(MLS)approximation.Themainideaistoreducethedimensionalityoftheformerandkeepthemeshlessadvantageofthelater.Therigidmovementmethodwasemployedtosolvethehyper-singularintegrations.The'boundarylayereffect',whichisthemaindrawbackoftheoriginalHybridBNM,wasovercomebyanadaptiveintegrationscheme.Thesourcepointsofthefundamentalsolutionwerearrangeddirectlyontheboundary.Thustheuncertainscalefactortakenintheregularhybridboundarynodemethod(RHBNM)canbeavoided.Numericalexamplesforsome3Delasticproblemsweregiventoshowthecharacteristics.Thecomputationresultsobtainedbythepresentmethodareinexcellentagreementwiththeanalyticalsolution.Theparametersthatinfluencetheperformanceofthismethodwerestudiedthroughthenumericalexamples.

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简介：雷文东，张汝刚，阎水忠，王秀琴，牟巨伟，张大为，吴Ｎｍ２３ＧＥＮＥＥＸＰＲＥＳＳＩＯＮＡＮＤＩＴＳＣＯＲＲＥＬＡＴＩＯＮＷＩＴＨＬＹＭＰＨＮＯＤＥＭＥＴＡＳＴＡＳＩＳＩＮＨＵＭＡＮＬＵＮＧＣＡＮＣＥＲ￥ＬｅｉＷｅｎｄｏｎｇ；ＺｈａｎｇＲｏｕｇｉｎｇ；...

简介：Forapairofnodess,tinanundirectedgraphG=(V,A)andagivenlevelUofallowabledelay,wewouldliketomodifythenetworkbynode-basedoredge-basedupgradingstrategiestomakethedelaybetweensandtnotgreaterthanU.Inthispaper,wepresentsomeNP-hardresultsforthedelayimprovementproblems.