共查询到20条相似文献,搜索用时 46 毫秒
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
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《河北大学学报(自然科学版)》1996,(4)
MicrobialDiversityandResourcesLiuZhiheng(InstituteofMicrobioly,ChineseAcademyofSciences,P.R.C.)MichaelGoodfelow(Universityof... 相似文献
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Theabrasionresistanceofyarnsisveryimportantforthedownstreamprocessingandend use ;manyresearchworkscon cernedaboutthisaspecthavebeendone[1~ 17] .Although ,becauseofthedifferenceinstructuresandproperties ,thebehavioroftheabrasionresistanceofdifferentyarnsisdif… 相似文献
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ThebandgapofSi-baseSi1-xGexalloycanchangealongwithcontentxandstrain ,thepeakwavelengthofphotodetectorsfabricatedbyusingthismaterialscanbemodulatedaccord inglyfrom 0 .8μmto 1 .6 μm .Si-baseSiGeinfrareddetectorsarecompatiblewiththeSiverylarge -scaleintegrated (VLS… 相似文献
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Recently ,theresearchofartificialsuperlatticeshasbeenahottopicincondensedmatterphysicsandmaterialsfield .Before 1 984,researchworksonsuperlatticesweremainlyfocusedonperiodicstructures .Thediscoveryofquasicrystalhasopenedupanewfieldincondensedmatterphysicsa… 相似文献
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Biosynthesis of Polyhydroxyalkanoates Consisting of Short-chain-length Monomers and Medium-chain-length Monomers by Pseudomonas YS1 总被引:3,自引:0,他引:3
IntroductionPolyhydroxyalkanoates(PHAs)areafamilyofbiopolyestersynthesizedbymanybacteria[1,2 ] .AmongPHAs ,polyhydroxybutyrateorPHBisthemostcommonmember[3] .AttemptshavebeenmadetodevelopcommercialfermentationprocessesfortheproductionofPHAs[4 7] .Biopol,acommerci… 相似文献
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Influence of the Surfactants on Microstructure and the Properties of Wet Coagulation Polyurethane Film. 总被引:2,自引:0,他引:2
IntroductionWhenthehomogeneoussolutionbecomesthermodynamicallyunstable (e g ,bytheintroductionofanonsolvent) ,thesolutionseparatesintotwoliquidphasesofdifferentcompositiontolowerthefreeenergyofthemixture Thisprocessisresponsibleforthegenerationoftheporou… 相似文献
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IntroductionGroupDecisionSupportSystem(GDSS)hasbeenanewDSSresearchareasince1980s.NowithasbecomeanimportanttrendofDSS[1,2].AGDSScombinescommunication,computing,decisionsupporttechnologies,andmoderninformationtheorytofacilitateformulationandsolutionofi… 相似文献
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Zhang Yibing 《上饶师范学院学报》1999,(6)
BecauseofwithoutEnglish-Spokensurroundings,ChinesestudentsfeelitisdifficultytolearnEnglishlanguage,especiallytheEnglishofspeci?.. 相似文献
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Jakub Wiener 《东华大学学报(英文版)》2002,19(3)
Manyofimportantphysicalandchemicalprocessesarebasedonthecapillarity—spontaneouspenetrationofliquidintotheporoussystems.Capillaryprinciplesareusedinvariousbranches.Everydaywecomeintocontactwithpracticalexamplesofwickingprocesses.Mostoftheseprocessesare… 相似文献
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Takingapanoramicviewofthetwistywayaboutthedevel opmentofthenon governmentalenterprisesofscienceandtechnol ogy (NGEST)inourcountry ,wehavenoticedtheindomitablevi talityandirresistiblepoweroftheseenterprises.NGESTworkwell,because,asasystem ,theirfunctioncomes… 相似文献
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《南京大学学报(自然科学版)》1999,(5)
Themajorfunctionofsuperoxidedismutase(SOD)istocatalyzethedismutationofsuperoxideanion(·O-2)andcontrolintracellularandextracellularconcentrationof·O-2.·O-2isthemediatorofmanydiseases.AlthoughSODhasbeenconsideredtobeappliedasapharmaceuticalformanyyear… 相似文献
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IntroductionInthecourseofneedleservice ,therearethreepairsoffric tion,whicharemadebetweenneedleandfabric ,tongueandgroove,footandtriangle Themainfailureforsewingneedlesisabrasive Therefore ,wearresistanceisoneofthemostimportantfactorsforsewingneedlestoinf… 相似文献
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Hu Debin Li Nianbing Zhang Shengtao Han Lianyi College of Chemistry Chemical Engineering Chongqing University College of Chemistry Chemical Engineering Southwest China Normal University 《西南师范大学学报(自然科学版)》1999,(5)
Manganesedioxidefordrybatteryuseismainlypreparedbyelectrolyzingmanganesesulfate.ElectrolyticMnO2ispreparedfromMnSO4insulfuricacidsolution,inwhichelectrochemicalprincipleisutilized.MnSO4ismadethroughthatmanganesesparisimmersedinsulfuricacid.Inthepas… 相似文献
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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
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《南京大学学报(自然科学版)》1999,(5)
Fish,likeothervertebrates,respondtoinfectiousagentsinspecificandnonspecificmanner.Amongthemmacrophage(M)isoneofthemostimportantcellularfactors.Misactivatedbyantigenstimulationorbytheprocessofphagocytosistogeneratereactiveoxygenintermediates,whic… 相似文献
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Yuen Ron Shen Department of Physics University of California Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA 《清华大学学报》1998,(1)
WhatareExcitinginLaserScienceYuen-RonShenDepartmentofPhysics,UniversityofCaliforniaMaterialsSciencesDivisionLawrenceBerkeleyN... 相似文献