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1.
IntroductionNonlinearobserversarenecessaryfornonlinearcontrolsystemswhentherearenotenoughsensorstomeasureallthestatesoritisdifficulttomeasuresomeofthestatesbysensors.Sinceitsintroduction[1],nonlinearobservershaveattractedtheattentionofmanyresearchers…  相似文献   

2.
Triple-layer Absorptive Structures for Shock Wave Blast Protection   总被引:5,自引:0,他引:5  
Thesurvivabilityofamissilesiloagainstablastwaveconstitutesacriticalissuefornationaldefense.Atriplelayerstructureisdesignedtostrengthentheprevioussinglelayerdesign.AsshowninFig1,thebottomlayerisacircularplatemadeofreinforcedconcrete(RC).Tworingsofsimples…  相似文献   

3.
And the Devils     
BothChristiansandChinesecommonpeoplehatedevils,buttheydealwiththemindifferentways.IntheChristianwayofthedevilsaresometimesinsideaperson’smind,soheneedn’tbeafraidofthem.WhenanhonestChristianfeelsthestirringofimproperdesiresheattributesthistotheDevils’…  相似文献   

4.
Thedioxotetraamineligandspossessthestructuressimilartothoseoftheoligopeptides .Theyareabletoformstablecomplexeswithtransitionmetalions .Theirtwoamidemoietieslosehydrogenionsduringcoordinationwithdivalentmetalions,thereforetheyareabletosta bilizehighoxid…  相似文献   

5.
0 IntroductionTheneedforintegrationofdifferentdatabasemanagementsystems (DBMSs) ,makingdifferencesbetweenthesesystemsinvisibleandprovidinguserswithauniformaccesstoallthedatabaseshasgrownrapidlyduringthelastdecade .However,databaseautonomyandheterogeneity…  相似文献   

6.
1 IntroductionInRef.〔1〕 theasymptoticstabilityofnonlinearslowlychangingsystemhasbeendiscussed .InRef.〔2〕theinstabilityofsolutionforthethirdorderlineardif ferentialequationwithvariedcoefficienthasbeendis cussed .Inthispaper,wehavediscussedstablilityandinsta…  相似文献   

7.
Thereislittledoubtthatabeliefinspiritualpowerswhichaffectourliveshasbeencommontoallhumangroupsovermanythousandsofyearsandpossiblyasmanhasexisted.Thisisperhapsanaturalcharacteristicconnectedwithman’scuriosityandneedforexplanatons,aswellastheinsecurity…  相似文献   

8.
Packingsandpackedcolumnsarewidelyusedinmanyprocessesinchemicalindustryandenvironmentaltechnology .Incontrasttoplasticandceramicmaterials ,stainlesssteelpackingsownadvantagesfortheirelasticityandfirmness.However,theirmasstransferperformancehasrecentlybee…  相似文献   

9.
TheexpressionofheterologousproteinsinEscherichiacolihasbecomeastandardtech niqueinmolecularbiology .E .coliexpressionsystemshavetheadvantagesofproductioneco nomicsandlogistics .TheseadvantageshavemadeE .coliexpressionsystemapopularchoicefortheproductionof…  相似文献   

10.
YANG Jun 《清华大学学报》1999,4(3):1495-1498
IntroductionImmuosensorsaresomeofthemostpromisingbiosensorsbecauseoftheireffectivenessandsensitivity[1] .Immunoassaysareusedtomeasuretheinteractionofantigensandantibodiesas partofimportantresearchonthephysiologyofanorganismantiinfectivity ,informationtra…  相似文献   

11.
IntroductionRecently,smallsatelliteshavebeenrapidlydevelopedas‘faster,cheaper,better’meansofcarryoutspacemissionsandascomplementstoconventionallargesatellitesystems.Manypredictthatsmallsatelliteswillleadtoarevolutionbothinsatelliteengineeringandinitsap…  相似文献   

12.
IntroductionThemostcommonmethodofyarnproductionistheinsertionofcontinuous ,unidirectionaltwistintoaparallelarrayoffibersorfilaments.Thehightorsionalstressesgeneratedinsuchaprocesshaveaconsiderableeffectonthestabilityandmechanicalcharac teristicsoftheya…  相似文献   

13.
Theabrasionresistanceofyarnsisveryimportantforthedownstreamprocessingandend use ;manyresearchworkscon cernedaboutthisaspecthavebeendone[1~ 17] .Although ,becauseofthedifferenceinstructuresandproperties ,thebehavioroftheabrasionresistanceofdifferentyarnsisdif…  相似文献   

14.
0 IntroductionAsthethirdlargestriverintheworldandthelargestriverinChina ,theYangtzeRiverissoimportanttohumansocietyinChinathatitisamirrorofChinesehistory .Sinceancienttimes,peopleinitsbasinshavebeensufferingfromandfightingagainstflooddisastersfromgenera…  相似文献   

15.
IntroductionNumericalsimulationofrotorstatorinteractionshasreceivedwidespreadattentioninthelastfewyearsbecauseoftheincreasinginterestinunderstandingtheunsteadynatureofflowsinturbomachinery.Therealflowsinsideaturbineoracompressorareunsteadyandarechara…  相似文献   

16.
IntroductionThemainmissionofpowerplantsimulatorsistoprovideinvaluabletrainingtoplantoperationalpersonnel.Todaythesimulatorshavebeenwidelyusedandtheirtrainingvalueshavebeenwellrecognized.Overthepastthreedecades,thesimulatorshavegonethroughseveralmajor…  相似文献   

17.
IntroductionFibrebundletensiletesterswereoriginallydevelopedandstandardisedforcottonfibres[1,2 ] .Thepurposewastogivearapidmeasurementofmeanfibrestrengthwhichavoidstheneces sityofmeasuringalargenumberofsinglefibres.Thefibrebundletesterwaslaterusedforwoolf…  相似文献   

18.
IntroductionThelongitudinaltensilepropertyofunidirectionalcompositeplateismainlydeterminedbythefiber.Thestressstrainrelationislinearforawidestrainrange,butthestressstrainrelationintransversedirectionandinshearisgenerallynonlinear.HahnandTsai[1]inve…  相似文献   

19.
IntroductionElectrolessNi Pplatingalloywhichbearsexcellentqualitiesofanti causticityandanti attritionhasabroadapplicationsintheindustryproduction Butinsomecases,itcannotgetgoodresultsbyusingonlyNi Pplatingalloyassurfacedefenseorconsolidationmaterials It…  相似文献   

20.
Therehasrecentlybeenasurgeofinterestinmarinebioresources,particularlyseaweeds,assourcesofbioactivesubstances.Amongthesestudies,ithasbeenshownthatpreparationsofseaweedsuchaspolysaccharide,peptideandphycobiliproteincanaffectthemultiplicationoftumorcells.M…  相似文献   

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