简介：设v1，v2，v3，…，vn是图G的n个顶点，（d（v1），d（u2），d（u3），…，d（vn））^T是图G邻接矩阵A的特征向量，则称G是调和图，其中d（vi）表示顶点弘的度．1—4圈的调和图已经确定，本文确定了所有的3-调和的5-圈调和图．

简介：Theenzymaticresolutionofracemicmethyl3-phenylglycidatewasinvestigated.Itwasfoundthatthehydrolysisrateof(2S,3R)-enantiomerwasfasterthanthatof(2R,3S)-enantiomerbyanewlipase.Atoptimalcondition96%of(2R,3S)-methylphenylglycidatewitheeof100%wasrecoveredfromtheracemicmixture.

简介：<正>LetCbeann-dimensionalspherewithdiameter1andcenterattheorigininEn.Theview-obstructionproblemforn-dimensionalspheresistodetermineaconstantv（n）tobethelowerboundofthoseαforwhichanyhalf-lineL,givenbyxi=ait（i=1,2,...,n）whereparametert≥0andai（i=1,2,...,n）arepositiverealnumbers,intersectsΔ（C,α）={αC+（m1+（1/2）,m2+（1/2）,…,mn+（1/2））:m1,m2,…mnnonnegativeintegers}.Inthispaper,forn=3,thefollowingresultisproved.Forα>1/51/2wehavethatanyhalf-lineL,givenbyxi=ait（i=1,2,3）,intersectsΔ（C,α）,whereparametert≥0andai（i=1,2,3）arepositiverealnumberssuchthat|a|+|b|+|c|≠3wheneveraa1+ba2+ca3=0forthreeintegersa,b,c.

简介：

简介：<正>Inthisnote.wewillshowthatnononuniformlatticeofSO（3,1）canbethefundamentalgroupofaquasi-compactKhlermanifold.Thus,combiningwiththeresultin[1].onegetsthatanonuniformlatticeinSO（n,1）（n≥3）cannotbeπ1ofanyquasi-compactKhlerianmanifold.

简介：Tris)(η5-cyclopentadienyl-μ-carbonyl-iron)-μ3-nitrosylclusterwasobtainedfromthereactionofcyclopentadienyldicarbonylirondimerwithnitrogenmonoxideinxylene.Theclusterwascharacterizedbyelementalanalyses,IR,MSand1HNMR.Thecrystalstructureof[(η5-C5H5)(μ-CO)Fe]3(μ3-NO).C4H8OwasdeterminedbyX-raydiffractionanalysis.ItcrystallizesintheorthorhombicspacegroupPnma,a=9.053(2),6=10.545(2),c=22.525(4)A,V=2150.3(7)A3,Z=4,Dc=1.68g.cm-3;structuresolutionandrefinementbasedon1141reflectionswithI>3.0(I)(MoKa,A=0.71073A)convergedatR=0.0540.Theinfraredabsorptionbandat1325cm-1oftheμ3-NOinthecluster,whichisredshifted,showsthatμ3-NOisactivated.

简介：Thetetranuclearalkyltin(Ⅳ)compounds{[R2Sn(C9H8N3O3)O]SnR3}2[R=n-Bu(1),4-CNC6H4CH2(2),C6H5CH2(3),4-ClC6H4CH2(4)]werepreparedbythereactionofSchiffbaseligandpyruvicacidisonicotinylhydrazonewith(R3Sn)2Ointhecorrespondingmolarratioof1:1.Allcompoundshavebeencharacterizedbyelementalanalysis,IRand^1HNMRspectra.Thecrystalstructureofcompound1wasdeterminedbyX-raysinglecrystaldiffractionalanalysis.Thiscompoundexhibitsadimericstructurecontainingdistannoxaneunitswithtwotypesofthetinatoms.Forthefirsttinatom,itappearstobeseven-coordinatedwithadistortedpentagonalbipyramidgeometry,andtheotherisfive-coordinatedwithadistortedtrigonalbipyramidalgeometry.Themoleculesarepackedintheunitcellintwo-dimensionalnetworkstructurethroughaninteractionbetweentheNatomsofthepyridineandthetinatomsofanadjacentmolecule.

简介：Blendsofpoly(3-hydroxybutyrate-co-3-hydroxyhexanoate)(PHBHHx)andpoly(butylenesuccinate-adipate)(PBSA),bothbiodegradablesemicrystallinepolyesters,werepreparedwiththeratioofPHBHHx/PBSArangingfrom80/20to20/80bymeltmixingmethod.Differentialscanningcalorimetry(DSC),thermogravimetryanalysis(TGA),dynamicmechanicalthermalanalysis(DMA),polarizingopticalmicroscopy(POM)andwideangleX-raydiffractometer(WAXD)wereusedtostudythemiscibilityandcrystallizationbehaviorofPHBHHx/PBSAblends.ExperimentalresultsindicatethatPHBHHxisimmisciblewithPBSAasshownbythealmostunchangedglasstransitiontemperatureandthebiphasicmelt.

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：用密度泛函方法「Ｂ３ＬＹＰ／６－３１１Ｇ（ｄ）」研究了ＳｉＰ２分子的各种可能异构体的结构、能量和红外光谱。结果表明：Ｓｉ２Ｐ２分子有５个稳定的异构体，能量最低的异构体为具有Ｐ－Ｐ桥键湖蝶形结构，其次为具有Ｓｉ－Ｓｉ桥键的菱形结构，而具有Ｓｉ－Ｓｉ中心键的直线结构能量高，并进一步将Ｓｉ２Ｐ２和Ｃ２Ｎ２分子结构和能量上的差异进行了比较和分析。

简介：采用微波合成法制备了含掺杂P，Al和La元素的正极材料LiCoO2，确定了工艺条件，包括反应时间、微波功率和反应温度．采用XRD，SEM和电化学测试仪研究了添加元素对LiCoO2结构和电化学性能的影响．研究发现，微波功率和反应时间对产物的结构有比较明显的影响．充放电试验结果表明，掺加La元素正极材料LiCoO2首次充放电容量达到了130mAh·g^-1．

简介：研究发现三异丙氧基稀土(铕或混合稀土)与甲基丙烯酸甲酯(MMA)/苯乙烯(St)混合后会形成凝胶体,经原位聚合后即制得掺稀土的P(MMA-co-St)改性材料.结果表明,掺铕或混合稀土的P(MMA-co-St)材料稀土含量高、透明性优良、耐热性好、贮能模量高;掺铕的改性材料呈现典型的配位敏化中心Eu3+的荧光光谱;掺混合稀土的改性材料在746.5,581,525和513nm处出现很强的Nd3+特征吸收;ESEM显示了掺稀土的P(MMA-co-St)改性材料的微观形貌有较大的变化.

简介：与浸透的土壤存款的由一条半球的冲积山谷的三维的散布和飞机P波浪的衍射的一个分析解决方案被采用Fourier-Bessel系列扩大技术开发。不同于以前的研究，浸透的土壤存款与单相的有弹性的理论在被模仿，在这篇论文，他们为浸透的多孔的媒介，和一半与Biot的动态理论被模仿空间作为asingle阶段被假定橡皮媒介。更少的频率，发生角度ofP波浪和土壤的孔在半球的冲积山谷的表面排水量放大上扔的尺寸的效果被调查。数字结果证明一条浸透的半球的冲积山谷的存在在表面排水量放大上有许多影响。当与发生ofP波浪评估一条半球的冲积山谷的排水量回答时，与Biot的动态理论模仿土壤存款是更合理的。

简介：设(M,T)是一个光滑闭流形上的对合,不动点集为F=RP(4)UP(4,2n-1),则它的每一个对合(M,T)必协边(RP(4)×RP(4),twist)和(P(4,2n),T')之一.

简介：Inthispaper,thetwoeffluentsfromPBA(3-phenoxy-benzaldehyde)productionprocessweretreatedbypolymericadsorbentCHA-111.PBAorPBC(3-phenoxy-benzoicacid)wasrecoveredfromthewastewaterintheprocessofneutralization.Asasecondarytreatmentmethod,adsorptionwithCHA-111showedbetterefficiencythanphotocatolyticdecompositionandsolventextraction.Theoptimaltechnologicalparameterswere:adsorption:currentvelocity:2.0BV/hr(bedvolumeperhour),roomtemperature;desorption:currentvelocity:2.0BV/hr(bedvolumeperhour),roomtemperature;desorption:currentvelocity:1.0BV/hr,80℃,8%sodiumhydroxideaqueoussolutions.Inconclusion,99.9%CODintheneutralizingwastewaterand98.4%CODinthehydrolysiswastewaterareremovedsuccessfully.

简介：Thehomoclinicbifurcationsinfourdimensionalvectorfieldsareinvestigatedbysettingupalocalcoordinatesnearthehomoclinicorbit.Thishomoclinicorbitisnonprincipalinthemeaningsthatitspositivesemi-orbittakesorbitflipanditsunstablefoliationtakesinclinationflip.Theexistence,nonexistence,uniquenessandcoexistenceofthe1-homoclinicorbitandthe1-periodicorbitarestudied.Theexistenceofthetwofoldperiodicorbitandthree-foldperiodicorbitarealsoobtained.

简介：Wastewaterfromproductionprocessof2,3-acidwastreatedbyadsorptionusingmacroporousresinNDA-708.Afteronlyone-steptreatmentbyresinadsorption,removalefficiencyofthreekindsofnaphthalenechemicalswasabove99%;removaleficiencyofCODcrwasabove96%.Underproperoperatingcondition,desorptionefficiencywasaround100%.Therunningrecordsoftheindustrialfacilityshowedthatthenaphthlenechemicalsindesorptioneffluentcouldbereusedwithoutobviousinfluenceonthequalityoftheproduct.

简介：Sixnewcompounds,α,β-KaHb[GeW9M3(H2O)3O37].xH2O(M=Al,Ga,In;a+b=7)andα-K9H5[Ge2W18Ga6(H2O)3O74].20H2O,weresynthesizedfromthelacunaryprecursorsαandβ-GeW9O3410-andcharacterizedbyelementalanalysis,spectroscopyandelectrochemistry.Tungsten-183NMRspectraofthetitlecomplexesconsistoftwolineswithintensityratio2:1asexpectedfortrisubstitutedheteropolyanions.Theintensityratioofα-Gacompoundis1:2,whichisdifferentfromothers(2:1).WiththehelpofFABmassspectrum,weconcludedthatitisadimerwithD3h,structureinaqueous,andtheothersexistbymonomerswithC3cstructures.

简介：Theaimofthispaperistostudy6-canonicalsystemofanonsigualrminimal3-foldX.If|2KX|isnotcomposedofpencils,itisshownthatΦ|6KX|isbirationalwithpossibleexceptionsfor:(K^3X,X(OX),ps(X))=(2,-1,1)or(4,-1,0)or(4,-1,1).

简介：Thispaperintroducesanimprovednewmethodwhichisusedtorecoversilverassilvernitratebyionexchangefromthewasters.Inthismethod,wecanrecoversilvernitrate,onlybyusingakindofionexchangeresinandtwoionexchangeprocesses.Itcanreplacetheoriginalrecoverymethodinwhichtwokindsofionexchangeresinsandthreeionexchangeprocessesareneeded.Theresultissatisfied