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1.
Forstudyingthedimensiontheoryofdynamicalsystem ,PesinintroducedCarath啨odorystructure(C structure)whichleadstothegeneralizationsofbothclassicaldimensionsandtopologicalpressures;HeconsideredtwotypicalC structureswhichconnectsrespectivelytheopencoveringand…  相似文献   

2.
ItiswellknownthattheBergman ,Carath啨odory ,KobayashiandEinstein K hlermetricsarefourclassicalinvariantmetricsincomplexanaly sis .TheBergmanmetric(denotedbyB)wasintro ducedbyBergmanforone[1] in 192 1orseveralvari ables[2 ] in 1933.Carath啨odoryintroducedtheinvari antdistancein 192 6 [3] andReiffenintroducedthein variantmetricin 196 3[4 ] ,thereforetheCarath啨odorymetric (denotedbyC)isalsocalledCarath啨odory Reiffenmetric .TheKobayashimetric (d…  相似文献   

3.
YANG Yi 《清华大学学报》1999,4(3):1528-1531
IntroductionAminoacylase (N acylaminoacidamidohydrolase .EC 3.5.1.14 ) ,whichexistsinmammaliankidneysandmicroorganisms ,catalyzesthereversiblehydrolysisofL acylaminoacids[1] .Theenzymeisdimericwitharelativemolecularwassof86 0 0 0 ,containingoneZn2 ionpersubunitwhichis…  相似文献   

4.
IntroductionChinaisthesecondlargeInternetmarketinAsia .Wearenowseeingmoree stores ,e banksande trading .InternationalDataGroupexpectse commercesalesof$ 3.8billionby 2 0 0 3.Theincreaseincomputerpenetration ,loweredphonechargesandinternet accessfeeswillleadtohighe…  相似文献   

5.
Introduction  Since 196 0 s ,withthedetailedstudyoftransformationalgen erativegrammar,Englishteachinghasgraduallyabandonedthemechanicpatterndrillsusedinaural oralmethodin 195 0 s,andfocusedondevelopingstudents communicativecompetence .MoreandmoreEnglishteacher…  相似文献   

6.
BackgroundIntheearly 195 0s,MortonandYen[1] developedthefibertracingmethodintheyarn .Theymixedsomedyedfibersintoyarnbeforecarding ,anddippedtheyarninachemicalreagentwithsimilarrefractiveindextoobservethedyedfibersintheyarnunderthemicroscope .Theconceptoffibe…  相似文献   

7.
0 IntroductionCalixarenesandtheirderivativeshaveattractedgreatinterestinhost guestchemistry .Theyarenotedfortheirabilitytoformhost guestcomplexesbytrappingorganiccompounds,smallions ,andgasesintheirtoruslikecavitiesaswellastomimicenzymefunctions[1] .Theyca…  相似文献   

8.
0 IntroductionMP 1 1isobtainedfrompepsindigestionofcytochromec .Itretainsaminoacidresidues 1 1 2 1ofcytochromec .Itisconsideredagoodmodelofc typehemeenzymesandperoxidases .Sofar,somemethodshavebeenusedtoimmobilizeMP 1 1onelectrodes ,suchasmixingupwithgraphitepast…  相似文献   

9.
0 IntroductionLiftingschemeasintroducedbyW .Sweldens[1] in 1996 ,isanewwayofconstructingwavelettransformthatnotnecessarilybasedontranslatesanddilatesofonefunction .LiftingallowstheconstructionofwaveletsentirelyinthespatialdomainwithoutmakinguseoftheFouriertr…  相似文献   

10.
Motion Tracking with Fast Adaptive Background Subtraction   总被引:3,自引:0,他引:3  
0 IntroductionInanintelligentvideosurveillanceandmonitoringsystem ,oneofthemostcomplexandimportanttasksisrealtimeextractingandtrackingmotionobjects .Ingeneral,thereexisttwomethodsforextractionnamedasforegroundextractionandbackgroundsubtraction ,respectiv…  相似文献   

11.
0 IntroductionThird harmonicgeneration (THG )imaginghasbeendemonstratedrecentyearsinbiologicaltissues[1,2 ] .OnedistinctadvantageofTHGimagingcomparingwithfluorescenceimagingisthatitcanproceedwithouttheneedtolabelthebiologicaltissueswithappropriateprobes .And…  相似文献   

12.
废水生物处理工艺简易优化方法   总被引:1,自引:1,他引:0  
Inthepast 30years ,USAChemicalAbstractcited 1 6paperswhichconcernoptimizationofbio logicaltreatmentprocessonlyinconventionalwastewater[1,2 ] .Buttherearethousandsofkindsofhaz ardousorganicwastewaterintheworld .Evenifsomecompaniescanoffertheoptimizationprocess ,…  相似文献   

13.
0 IntroductionSeleniumpresentsanutritionconundrumthroughitsdualstatusasanessentialandhighlytoxicnutrient.Fromearlyinthiscentury ,seleniumhasbeenknowntocausetoxicityinanimalsproducingconditions ,suchasblindstaggersandalkalidisease[1] .In 195 7,SchwardzandFoltz…  相似文献   

14.
0 IntroductionTheexplosivedevelopmentofInternethasmadeitssecurityaninternationalfocus.Intrusiondetectionhasbecomeanimportantfieldofresearchbecauseofinexistenceofcompletely securesystem .Today ,manyIDSsuserule basedexpertsystemtodetectintrusion ,theyencode…  相似文献   

15.
0 IntroductionThemethodofmineralizingorganictoxicantsinthewastewaterbygenerating·OHradicalshasbecomefocusofchemicaltheoriesandtechnicalresearchesintheenvironmentprotection[1] .Because·OHradicalisastrongoxidizerwithstandardpotentialof2 .80V ,withit,thestable…  相似文献   

16.
IntroductionTheannualincreaseofnonwovenfabricsproductionisabout2 0 %[1] ,whichisthehighestinthefieldoffabricproducts.Themostpopularfibersofnonwovenfabricsarepolyethylenetereph thalate (PET) ,polypropylene (PP) ,polyvinylalcohol (PVA )andNylon .BecausePETandPPbelon…  相似文献   

17.
0 IntroductionInthispaper,wedonotaddressproblemssuchashowfirmsmanagetoimplicitlyorexplicitlycoordinatetheirresearchef fortsandhowtheresearchinformationissharedbytheparticipatingfirms (seeRef.[1,2 ]) .Instead ,wewanttoinvestigatehowfirmsdeterminetheirresearch…  相似文献   

18.
ThebandgapofSi-baseSi1-xGexalloycanchangealongwithcontentxandstrain ,thepeakwavelengthofphotodetectorsfabricatedbyusingthismaterialscanbemodulatedaccord inglyfrom 0 .8μmto 1 .6 μm .Si-baseSiGeinfrareddetectorsarecompatiblewiththeSiverylarge -scaleintegrated (VLS…  相似文献   

19.
Weconsiderthemodelinnondimensionalformasfollowing ,whichisconcernedin [1] x =x(1-x) - p(x) y+b∫+∞0 f(s) y(t-s)ds y =y(δ- βyx)x(0 ) >0 ,y(0 ) >0  Weapplyanovelmethodforprovingtheglobalstability .LetX→ f(X) ∈RnbeaC1functionforXinanopensetD Rn.Considerthedifferentialequation X =f(X) (1.1…  相似文献   

20.
0 IntroductionC3N4 isanewlydevelopedsuperhardcoatingmaterial.Itwaspredictedbytheorytohaveahardnessthatcanbecomparabletoorevenexceedingthatofdiamond[1 4 ] ,whichcausestheattentionofmanyscientists.Fujimoto[5] depositedC3N4 coatingsonWCsubstratesbyIonAssistedDyna…  相似文献   

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