简介：对于半平面中的调和函数,在本文中证明了如果它的正部满足某些限制增长条件,则它可以用半平面边界上的积分表示出来并且它的绝对值也满足类似的增长条件,这一结果改进了在半平面中调和函数的某些经典结果.

简介：

简介：<正>证明题是平面几何中常见的题型,那么什么叫证明?证明就是根据题设、定义、性质以及已经被确认的公理、定理等,经过逻辑推理,来判断一个命题是否正

简介：提出一种借助摄影技术,运用信息技术计算复杂无规则有限电荷面激发场强的方法。该方法借助Matlab的Image函数的读图功能分别读取电荷面图像信息数并将之转换成二维矩阵数字。用电荷面图像的像素点代表电荷面的面元,根据电荷在空间产生的场强理论,通过计算机识别和计算来实现对电荷面所在空间某点场强的求解,算例表明该方法得到的结果与理论计算结果相对误差很小。

简介：本文研究了含有导电刚性夹杂物压电材料有电力负荷下的反平面振荡问题。

简介：Twooxo-vanadium(IV)complexes,[VO(C2O4)(2,2′-bipy)(H2O)]·C2H5OH(1)andVO(C2O4)(phen)(H2O)(2),where2,2′-bipy=2,2′-bipyridyl,phen=1,10-phenanthroline,weresynthesizedaspotentialfunctionalmodelsofvanadiumhaloperoxidases(VHPOs)inmixedsolventofethanolandwateratroomtemperature.Thecomplexeswerecharacterizedbyelementalanalysis,infrared(IR),UV-VisandX-raycrystallography.Structuralanalysesshowedthatvanadiumatomwascoordinatedbyaterminaloxygen,oneoxygenatomfromcoordinatedwater,twooxygenatomsfromthecarboxylategroupofoxalicacid,andtwonitrogenatoms(N1andN2)from2,2′-bipy/phen.Centralvanadiumatomsincomplexes1and2werebothinadistorted-octahedralenvironment,andsomeintermolecularhydrogenbondinglinkageswerealsoobservedineachcomplex.BrominationreactionactivityofthetwocomplexeswasevaluatedwithphenolredasorganicsubstrateinthepresenceofH2O2,Br-andphosphatebuffer,indicatingthattheycanbeconsideredasapotentialfunctionalmodelofVHPO.Inaddition,thermalanalysiswasalsoperformedanddiscussedindetail.

简介：Thecombinationofboth4,4′-bipyridine(4,4′-bipy)anddihydrogenphosphateanionligandswithcopper(Ⅱ)resultsintheformationofanovellayeredcompoundCu(4,4′-bipy)2(H2PO4)2(H2O)2.ThecrystalstructurecomprisesdiscreteneutralCu(4,4′-bipy)2(H2PO4)2(H2O)2units.Thecopperatom,locatedonthecrystallographictwofoldaxis,iscoordinatedwithtwonitrogenatomsofterminal4,4′-bipyligandsandtwowatermoleculesattheequatorialpositions,andtwodihydrogenphosphateoxygenatomsattheaxialpositions,forminganelongatedoctahedron.Thecomplexisatwo-dimensionaldistortedrhomboidalnetworkpossessingtwokindsofrhomboidswithdimensionsofca.1.6792nm×0.3203nmand1.2778nm×0.3198nm,respectively.Thetwo-dimensionalnetworksarestackedparallellyoneachotheralongc-axistogiveanextendedthree-dimensionalchannelnetworkwithaninterlayerdistanceofca.0.5030nm.Crystaldata:triclinic,spacegroupP-1,a=1.0253(2)nm,b=1.4501(3)nm,c=0.79715(16)nm,α=97.91(3)°,β=90.99(3)°,γ=85.54(3)°,V=1.1703(4)nm3,Z=2,R=0.0892,wR=0.2451.

简介：

简介：由di-(2,4,4-trimethylpentyl)的L本氨基丙酸的抽取行为phosphinic酸，di-(2,4,4-trimethylpentyl)-monothiophosphinic酸和di-(2-ethylhexyl)磷的酸分别地在二阶段、三阶段的系统被学习。为这些抽取反应的平衡常数是计算的。

简介：稀土元素aryloxides由各种各样的烷基组代替了[行(浆)3]例如甲基，isopropyl和tertbutyl，被用作单个部件催化剂影响L减水乳酸(LLA)的戒指洞聚合。催化活动，聚合特征，聚合动力学和机制被学习。稀土元素aryloxides的催化活动被结构和烷基组的数字在苯基戒指上影响，这被发现。越强壮烷基组的电子捐赠能力，催化活动将是越多higher。代用品组的数字的增加将导致一项更高催化的活动。镧tris(2,4,6-tri-tert-butylphenolate)[La(OTTBP)3]在所有镧aryloxides之中展出最高的活动。根据1H-NMR数据，LLA聚合经由包含减水乳酸的酰氧债券的劈开的协作插入机制继续了，这被建议。关键词戒指洞聚合-L减水乳酸-稀土元素aryloxides这个工作被山西省(号码2006011069)的自然科学基础和山西省(号码2009011059-7)的关键实验室的开的基础支持。

简介：基于乙醇/水溶液体系结晶纯化制备了Fmoc-L-亮氨酸.通过HRMS,IR和1HNMR对该化合物进行了化学结构分析.被测化合物相对分子质量与Fmoc-L-亮氨酸理论相对分子质量一致,含有芴环、酰胺键和苯环等Fmoc-L-亮氨酸特征基团,其结构与目标化合物的分子结构一致.

简介：GinsenosidesRg1,Re,Rb1,Rc,Rb2,Rb3,andRdindifferentpartsoftheAmericanginsengplantwereinvestigated.Theextractionprocesswasapressurizedmicrowave-assistedextraction(PMAE).Thesevenginsenosideswereseparatedanddeterminedbyhigh-performanceliquidchromatography(HPLC)withaultraviolet(UV)detector,at203nm.TheexperimentresultsshowedsignificantvariationsintheindividualginsenosidecontentsoftheAmericanginsengindifferentpartsandagesoftheplant.Theresultsdemonstratedthattheleaves,roothairs,andrhizomesofPanaxquinquefoliusL.containedhigherginsenosidecontents,followedbythemainrootsandstems.TheleavescontaineddramaticallyhigherlevelsofginsenosideRg1,Rb3,andRdthantheotherfourparts.HighercontentsofRb1andRewerepresentinthemainroots,roothairs,andrhizomes.Theamountofginsenosidecontentinthestemswasthelowest.Thetotalcontentofthesevenginsenosidesinmainroots,roothairsandrhizomesincreasedwiththeageoftheplant.Incontrast,theginsenosidecontentsintheleavesandstemsdecreasedwithayearofgrowth.

简介：Arareearthcoordinationsystemwasfirstinvestigatedasanewtypeofcatalystforthering-openingpolymerizationofα-aminoacidN-carboxyanhydrides（NCAs）.Theresultsforthepolymerizationofγ-stearyl-α,L-glutamate（SLG）NCAusingneodymiumacetylacetonate（Nd（acac）3）-orneodymiumtris（2-ethylhexylphosphonate）(Nd(P204)3)-triethylaluminum-waterascatalystswerecomparedwiththoseusingconventionalcatalysts.Itwasfoundthatthehelicalpoly（γ-stearyl-L-glutamate）withhighmolecularweightaswellasnarrowmolecularweightdistributioncanbeobtainedinthepresenceofNd（acac）3/AlEt3-1/2H2O.ThepolymerobtainedwascharacterizedbyIRandNMRspectroscopy.

简介：

简介：Thestructureandkineticsofthecomplexformedbyhyaluronicacid(HA)andpoly(L-lysine)(PLL)werestudiedbytimeresolvedlaserlightscattering,TEM,andAFM.BecauseHAhasahydrophilicbackbone,thecomplexesformedbyHAandPLLaredifferentfromthoseformedbyoppositelychargedpolyelectrolytesbothhavinghydrophobicbackbones.Insteadofformingstrongaggregatesandevenprecipitates,thecomplexinthepresenceofexcessHAisstableinthestudiedtimeperiod.Moreimportantly,thecomplexspontaneouslyformscore-coronastructurebytherearrangementofHAchains.ThecoreiscomposedofcomplexrichofPLLandthecoronaismainlyHA.FurtheranalysisshowsthatthehydrogenbondformedbyHAcreatesabarrierhinderingthefurtherrelaxationofHAchains.Theautomaticformationofcore-coronastructurebyPLL/HAishelpfulnotonlytounderstandtherelaxationofpolyelectrolyteincomplex,butalsotodevelopdrugcarrierswithdesirableproperties.

简介：Anewcerebroside,1-O-(β-D-glucopyranosyloxy)-(2S,3R,4E,8Z)-2-[(2′R)-2’-hydroxylignoceranoylamino]-4,8-tetradecene-3-diolwasisolatedfromthe60%EtOHextractoftraditionalChinesemedicalplantCyperusrotundusL.Itsstructurewasdeterminedonthebasisofspectroscopicdata.Thisnewcompoundshowedanti-proliferationeffectonvascularsmoothmusclecells(VSMCs).

简介：

简介：

简介：

简介：令R是有1的结合环,本文中给出R上某些2×2块阵的群逆的存在性及表示.