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1.
Fine Structure of Regenerated Silk Fibroin Solids   总被引:1,自引:0,他引:1  
IntroductionSilkfibroin (Bombyxmori)isthepolymerwithtwokindsofcrystalstructure,silkⅠandsilkⅡ[1,2 ] .ThespaceconformationofsilkⅠtakesontheshapeofcrookedhandle ,theintermediateformbetweenα spiralstructureandβ foldedstructure ,andthatofsilkⅡisanti parallelβ folde…  相似文献   

2.
MicrobialDiversityandResourcesLiuZhiheng(InstituteofMicrobioly,ChineseAcademyofSciences,P.R.C.)MichaelGoodfelow(Universityof...  相似文献   

3.
Theabrasionresistanceofyarnsisveryimportantforthedownstreamprocessingandend use ;manyresearchworkscon cernedaboutthisaspecthavebeendone[1~ 17] .Although ,becauseofthedifferenceinstructuresandproperties ,thebehavioroftheabrasionresistanceofdifferentyarnsisdif…  相似文献   

4.
ThebandgapofSi-baseSi1-xGexalloycanchangealongwithcontentxandstrain ,thepeakwavelengthofphotodetectorsfabricatedbyusingthismaterialscanbemodulatedaccord inglyfrom 0 .8μmto 1 .6 μm .Si-baseSiGeinfrareddetectorsarecompatiblewiththeSiverylarge -scaleintegrated (VLS…  相似文献   

5.
Recently ,theresearchofartificialsuperlatticeshasbeenahottopicincondensedmatterphysicsandmaterialsfield .Before 1 984,researchworksonsuperlatticesweremainlyfocusedonperiodicstructures .Thediscoveryofquasicrystalhasopenedupanewfieldincondensedmatterphysicsa…  相似文献   

6.
In Vivo Study of Brain Metabolism Using Nuclear Magnetic Resonance   总被引:1,自引:0,他引:1  
IntroductionInformationonbrainmetabolismisofgreatimportance,especialyconcerningthesequenceofhypoxic-ischemicepisodes(e.g.,bir...  相似文献   

7.
IntroductionPolyhydroxyalkanoates(PHAs)areafamilyofbiopolyestersynthesizedbymanybacteria[1,2 ] .AmongPHAs ,polyhydroxybutyrateorPHBisthemostcommonmember[3] .AttemptshavebeenmadetodevelopcommercialfermentationprocessesfortheproductionofPHAs[4 7] .Biopol,acommerci…  相似文献   

8.
IntroductionWhenthehomogeneoussolutionbecomesthermodynamicallyunstable (e g ,bytheintroductionofanonsolvent) ,thesolutionseparatesintotwoliquidphasesofdifferentcompositiontolowerthefreeenergyofthemixture Thisprocessisresponsibleforthegenerationoftheporou…  相似文献   

9.
IntroductionGroupDecisionSupportSystem(GDSS)hasbeenanewDSSresearchareasince1980s.NowithasbecomeanimportanttrendofDSS[1,2].AGDSScombinescommunication,computing,decisionsupporttechnologies,andmoderninformationtheorytofacilitateformulationandsolutionofi…  相似文献   

10.
BecauseofwithoutEnglish-Spokensurroundings,ChinesestudentsfeelitisdifficultytolearnEnglishlanguage,especiallytheEnglishofspeci?..  相似文献   

11.
Manyofimportantphysicalandchemicalprocessesarebasedonthecapillarity—spontaneouspenetrationofliquidintotheporoussystems.Capillaryprinciplesareusedinvariousbranches.Everydaywecomeintocontactwithpracticalexamplesofwickingprocesses.Mostoftheseprocessesare…  相似文献   

12.
IntroductionThekeyofConcurentEngineering(CE)isasystematicapproachtotheintegrated,concurentdesignofproductandtherelatedprocese...  相似文献   

13.
Takingapanoramicviewofthetwistywayaboutthedevel opmentofthenon governmentalenterprisesofscienceandtechnol ogy (NGEST)inourcountry ,wehavenoticedtheindomitablevi talityandirresistiblepoweroftheseenterprises.NGESTworkwell,because,asasystem ,theirfunctioncomes…  相似文献   

14.
Theadsorptionofproteinsatsolid-liquidinterfacesisofgreatbiological,medical,andindustrialsignificance.Theinitialadsorptionofpl...  相似文献   

15.
Themajorfunctionofsuperoxidedismutase(SOD)istocatalyzethedismutationofsuperoxideanion(·O-2)andcontrolintracellularandextracellularconcentrationof·O-2.·O-2isthemediatorofmanydiseases.AlthoughSODhasbeenconsideredtobeappliedasapharmaceuticalformanyyear…  相似文献   

16.
IntroductionInthecourseofneedleservice ,therearethreepairsoffric tion,whicharemadebetweenneedleandfabric ,tongueandgroove,footandtriangle Themainfailureforsewingneedlesisabrasive Therefore ,wearresistanceisoneofthemostimportantfactorsforsewingneedlestoinf…  相似文献   

17.
Manganesedioxidefordrybatteryuseismainlypreparedbyelectrolyzingmanganesesulfate.ElectrolyticMnO2ispreparedfromMnSO4insulfuricacidsolution,inwhichelectrochemicalprincipleisutilized.MnSO4ismadethroughthatmanganesesparisimmersedinsulfuricacid.Inthepas…  相似文献   

18.
Current Application of Search Engines and Their Developing Trend   总被引:2,自引:0,他引:2  
IntroductionWorldWideWebisoneofthemainservicesonInternet.In1991,thefirstWebsoftwareisworkedoutinordertoaffordasharedtoolofachievementandgroupinformationforitsphysicistsinCERNinSweden .Fromthenon ,thewebtechnologyanditsapplicationsareexpandingatanamazingsp…  相似文献   

19.
Fish,likeothervertebrates,respondtoinfectiousagentsinspecificandnonspecificmanner.Amongthemmacrophage(M)isoneofthemostimportantcellularfactors.Misactivatedbyantigenstimulationorbytheprocessofphagocytosistogeneratereactiveoxygenintermediates,whic…  相似文献   

20.
WhatareExcitinginLaserScienceYuen-RonShenDepartmentofPhysics,UniversityofCaliforniaMaterialsSciencesDivisionLawrenceBerkeleyN...  相似文献   

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