简介：ThemethanolicextractfromaChineseendemicChrysanthemumplant,Dendranthemaindicumvar.aromaticum,wasfoundtoshowhighantifeedingactivityagainstPierisbrassicaeL.,andbybioassay-guidedseparation,theactivecomponent,B-ring-homo-tonghaosu,2-(2',4'-hexadiynylidene)-1,6-dioxaspiro-[4,5]-dec-3-ene(2)wasisolated.Itsstructurewaselucidatedbycomparingitsspectroscopicdatawiththoseof2reportedintheliteratures.FurthermorenewconvenienttotalsynthesismethodsofB-ring-homo-tonghaosuwerealsodevelopedtoconfirmitsstructureandmakeitsfurtherapplicationincropprotectionavailable.Inaddition,extensivecomparisonofspectroscopicdatashowedthatthestructureofcompound21reportedinliteratureshouldberevisedto2.

简介：在这份报纸，我们在公制的Lp(R)(1p)得到平均-B宽度和Sobolev班Brp(R)的无限的维的-G宽度的准确价值并且获得准确(N)和强壮的asymptotic(>1)在公制的Lq的Sobolev牛肉熏香肠班Wrpq(R)的无限的维的-G宽度的结果在公制的Lqp(R)(1qp)的(R)和它的双盒子Wrp(R)。

简介：研究取值于Banach空间随机变量序列的一类局部收敛定理．作为推论，得到了一类B值鞅差序列的极限定理和经典的独立随机变量序列的极限定理，

简介：极其细小磨擦非结晶的合金催化剂被化学减小与KBH4准备。在在气压的cinnamaldehyde的液体阶段加氢期间，Ru-B催化剂准备了展出优秀选择到cinnamyl酒精。当加氢与超声的照耀被执行时，当到cinnamyl酒精的选择仍然保持几乎未改变时，反应率能极大地被提高。加氢率随超声的频率或照耀时间的增加被增加。根据各种各样的描述，例如XRD，XPS，TEM，赌注和ICP，结构、电子的特征上的超声的照耀的效果磨擦催化剂简短被学习。同时，催化表演上的ultrasonication的提升效果也基于cinnamaldehyde的选择加氢被讨论到cinnamyl酒精。

简介：ThispaperreportsastudyofcomplexfocussingacousticfieldsofaconvexphasedarrayprobewidelyusedinultrasonicdiagnosticB-scanner.Thetimedelaynecessaryforelectronicfocussingandforgeometricfocussingofcomplexfocussingisgiven.BymeansofHelmholtz‘sintegralformula,theexpressionsofacousticfieldswereobtainedfortheelectronicfocussingandcomplexfocussing.Withsimpson‘snumericalintegral,agreatdealofcomputationswascarriedoutwithan86/330computer.Bymeansofusingdifferentparameters,anoptimumfocalrangeandbeamwidthofa4sequenceselectronicandcomplexfocussingacousticsystemwasselected.WithanEUB-40ultrasounddiagnosticB-scannerproducedbytheHitachicompany,thelateralfocussingacousticfieldandlateralresolutioninanechoictankwerephotographedbylatticingmethodandtheexperimentalresultiscon-sistentwiththetheory.

简介：Inthispaper,basedontheimplicitRunge-Kutta(IRK)methods,wederiveaclassofparallelschemethatcanbeimplementedontheparallelcomputerswithNs(Nisapositiveevennumber)processorsefficiently,anddiscusstheiterativelyB-convergenceoftheNewtoniterativeprocessforsolvingthealgebraicequationsofthescheme,secondlywepresentastrategyprovidinginitialvaluesparallellyfortheiterativeprocess.Finally,somenumericalresultsshowthatourparallelschemeishigherefficientasNisnotsolarge.

简介：Anewapproachtodeterminealltheelectro-elasticconstantsofthepiezoelectriccrystalsinclass4mmhasbeenputforward.Asanexample,alltheconstantsofLithiumTetraborate（Li2B4O7）crystalhavebeenmeasuredbymeansoftheapproach.Theoutstandingadvantageoftheapproachisthatiton-lyneedstoemployinmeasurementthreecrystalplatesdifferentlyoriented.

简介：给出了线性方程组Ax=b的反问题在n阶矩阵类中解的一般形式．

简介：HeteroatomM-ZSM-12zeolites(M=B,Al,Ge,Ga,Fe)arehydrothermallysynthesizedanditisprovedthattheheteroatomMisinvolvedintheframeworkofsynthesizedmolecularsievesbymeansofXRD,IRspectra.TheresultsofadsorptionanddiffusionexperimentsindicatethattheheteroatomMmodifiestheporevolume,specificsurfacearea,andthechannelofZSM-12molecularsieves.

简介：运用转移矩阵的技巧,本文给出了戴帽B27N27硼-氮zlgzag纳米管的克库勒结构数的计算公式.在实际计算中,根据管的对称性,转移矩阵的阶得到了显著地降低.

简介：关于递推数列Ｘｎ＋１＝（ａｘｎ＋ｂ）／（ｃｘｎ＋ｄ）的极限的注记田文平（南京审计学院）关于递推数列Ｚ．＋ｌ一；；＝：一的极限．文Ｄ」给出了下面两个结论：”—”——“”””“”－ｘ＋ｄ”“”’””““－“”“““’””“’—””“”结论１设数列?..

简介：Thetitlecomplexi-C4H9Co（salen）（Py）（Py=pyridine.salen=dianionofdisalicylideneethylenediamine）hasbeenfirstsynthesized.ItscrystalstructurehasbeendeterminedbyX-raydiffractionmethod.ThecrystsisaremonoclinicwithspacegroupP21/C.Theunitcellparametesarepresented.ThestructurehasbeenrefinedtoafinalRof0.038.

简介：讨论了p型Banach空间(1≤p≤2)下,B值行独立随机元阵列部分和的完全收敛性,得到了几个充分条件的结果,它们是实值随机变量阵列完全收敛性的推广.

简介：Thediblockcopolymersintercalatedlayeredsilicatewaspreparedviaameltdispersiontechnique.Thentheeffectofintercalatedhybridasfilleronacrylonitrile-butadiene-styreneresinwascharacterizedbyX-raydiffraction,transmissionelectronmicroscopy,stress-strainmeasurementsinelongation.

简介：应用线性算子的积分群理论证明M/M^B/1排队模型的时间依赖解的存在唯一性，其次推出M/M/1排队模型的时间依赖解的存在唯一性。

简介：6/3-(4-Chlorophenyl)-s-triazolo[3,4-b][1,3,4]thiadiazoles(2a-e)and(5a-e)weresynthesizedrespectivelybyintermolecularcyclizationof5-aryl/4-chlorophenyl-4-amino-3-mercapto-1,2,4-triazoles(1a-e)and(4)with4-chlorobenzoicacid/arylacids,whichwerecondensedwithpiperazineunderphasetransfercatalystTBABtoyieldthecorrespondingfreebasesofmonopiperazinederivativesandfollowedtoformwater-solublesalts(3a-e)and(6a-e)withhydrochloricacidingoodyields.Theinvitrobiologicalresultsshowedthatpiperazinegroupconjugatedwiththeabovefusedheterocyclesplayedanimportantroleinantibacterialactivity.ThestructuresofnovelcompoundswereconfirmedbyIR,1HNMR,MSandelementalanalysis.

简介：The2-C,methylenegroupof1-aroyl-1,2-dihydro-3H-naphtho[2,1-b]pyran-3-ones(2)havebeenshowedtopossessasuperiorreactivitytowardsmanyoforganicreagents.Thena-phthopyrones(2)condensedwitharomaticaldehydestogivethe2-arylidinederivatives(3).Bromin-ationof2gave1,2-dibromo(4)or5-bromo(5)derivativesdependingonthereactionconditions.Thebasecatalyzedadditionorcycloadditionofnaphthopyrones(2)to4-methoxybenzalacetophenonegavetheexpectedMichaeladduct(6)orthecyclicadducts(7-9)dependingonthetypeofcatalyticbaseandreactionconditions.Structuresoftheproductshavebeenestablishedbyelementalanalyses,IRand~1HNMRspectroscopicmethods.

简介：3-(2-Hydroxyphenyl)-6-(4-nitrophenyl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazine,C16H11N5O3S,waspreparedbythecyclizationof3-(2-hydroxyphenyl)-4-amino-5-mercapto-1,2,4-triazolewith2-bromo-4-nitroacetophenone.Thecompoundwascharacterizedbymeansofelementalanalysis,IR,1HNMR,13CNMR,massspectrometry,andX-raydiffraction.ThecompoundcrystallizesinamonoclinicsystemwithspacegroupCc,a=2.1853(4)nm,b=2.1192(5)nm,c=1.3526(3)nm,β=95.21(2)°,V=6.238(2)nm3,Dcalcd.=1.505Mg/m3,Z=16,F(000)=2916,R1=0.0501,wR2=0.0427.Acomparisonbetweenthecrystalstructuresof1,2,4-triazolo[3,4-b][1,3,4]thiadiazineand1,2,4-triazolo[3,4-b][1,3,4]thiadiazolewasmadeinthestructuralview.Atwo-dimensionalnetworkisformedbyhydrogenbondsandπ-πstackinginteractions.

简介：8,8′-Dibromo-6,6′,7,7′-tetramethoxy-5,5′-diisopropyl-3,3′-oxydimethylenedinaphtho[2,1-b:2′,1′-d]furan,C32H30Br2O;M.W.=670;triclinic;spacegroupP1;a=8.896（2）,b=10.216（1）,c=10.423（1）A,α=108.48（1）,β=119.36（1）,γ=99.26（1）;V=723.5A3;Z=1,Dcal.=1.479g.cm-3.MoKα=28.11cm-1,F（000）=326,T=293K.Thestructurewassolvedbydirectmethodandfull-matrixleast-squaresrefinementconvergedatR=0.034for2377observedreflections.Theoxygenatominseven-memberedringexistsinadisorderedarrangement.Bothbisnaphthaleneandoxygen-containingfive-memberedringhaveplanarconformationswithdihedralangle6°,showingmarkedaromaticfeature.

简介：Halfsandwichirondicarbonylcomplex[η5-C5H3(t-Bu)2]Fe(CO)2Cl(1)reactswith1,2-dilithiumdiselenocarboraneLi2Se2C2B10H10(2)togiveabinuclearironcarboranecomplex[η5-C5H3(t-Bu)2]2Fe2(CO)3*Se2C2B10H10(3).TheX-raydiffractionanalysisofcomplex3revealsthatoneoftheironatomsischiral.