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1.
Theconceptofoptimalmagiccubeandthewayofconstructingoptimalmagiccubeoforder1 6nwasgivenin 1 988[1] .Howtoconstructopti malmagiccubesofor  相似文献   

2.
A new method for estimating system error of guidance instrument   总被引:6,自引:0,他引:6  
Theaccuracyoflongrangerocketis,toagreatextent,determinedbytheguidanceaccuracy.Theerrorofguidanceisclassifiedintotwotypes:theerrorofguidancemethodandtheerrorofguidanceinstruments.Withtheperfectionofguidancescheme,theerrorofguidancemethodhasbeenloweredtoo…  相似文献   

3.
Theconstructionoftheorthogonalwaveletandcom pactlysupportedonehasalreadybeenperfected[1~ 3] ,fromwhichthepyramidaldecompositionandreconstructionalgorithmhasbeendeduced[4~ 7] .Inthispaper ,wemakeuseofthetwo scaleintegralequationtoconstructadyadicscalefunctionf…  相似文献   

4.
Dynamic thermal stress distribution in surface of two-dimensional cavity   总被引:1,自引:0,他引:1  
0 INTRODUCTIONBecausethestressdistributionatthesurfaceofacavityinanelasticmediumdirectlyinfluencedthestrengthofacomponentinmechanicalmanufactureandarchitecture ,itisatypicalproblemintheme chanics ,architectonics ,nuclearindustryandgeologi calexploration .…  相似文献   

5.
0 INTRODUCTIONTheprecisionmachinetoolisfundamentalequip menttofulfilladvancedtechniquesofmanufactoryandtheservocontrolsystemisthekeyfactorbecauseitdecidesthemachiningaccuracy ,surfacequalityandproductivityofthemachinetool.Duetosomeme chanicalstructurere…  相似文献   

6.
Itiswellknownthatpredictivecontrolme thodsareveryeffectiveinprocesscontrol,whichhasarousedagreatdealofinterestbothinpracticeandtheory .Receding horizoncontroltechnique ,orthemodelpredictivecontroltechnique ,isoneofthepowerfulapproachesforpredictivecontro…  相似文献   

7.
0 INTRODUCTIONPrecisiondesigninvolvesdesignofmaterials ,me chanics ,electronics ,control,thermal mechanics ,dynam icsandsoftwareandeachfactormayhavesomeeffectonthefinalmachiningaccuracy[1] .Errorsourcesrefertofac torsandlocationsthatcanproducemachiningerrors .…  相似文献   

8.
0 INTRODUCTIONAcrackisusuallyregardedasofzero thicknessandinclosecontactwiththemediaoneithersideandthereisnocontactforcebetweencracks.Thecrackscansupportnotonlystressbutalsopullandshearingforce ,sothemediumbetweencrackskeepsthecon tinuumofstressanddispl…  相似文献   

9.
Cooling simulation of plastic injection molding   总被引:2,自引:0,他引:2  
0 INTRODUCTIONInjectionmoldingisacyclicprocesswhereinmeltingpolymerisforcedintoacoldmetalmoldunderhighpres sureandcooleduntilitissolidenoughtobeejectedfromthemold .Coolingisacrucialpartoftheinjectionmoldingcycle ,becauseithasamajorimpactonboththequality…  相似文献   

10.
1 IntroductionThehighmechanicalproperties ,gooddurabilityandappropriateworkabilityarenecessaryforhighperformanceconcretetosatisfytheconstructionrequirementoflarge scaleconcreteengineering .Accordingtodifferentapplica tionsandpurposes ,inordertoimprovethe…  相似文献   

11.
1 IntroductionTheelectricaltransportproperties (conductiontype ,carrierconcentration ,carriermobility ,carriereffectivemass)andthethermaltransportproperties (atomdis placementparameter ,meanfreepathofphonon ,latticethermalconductivity)offilledskutteruditecomp…  相似文献   

12.
ACID RECOVERY FROM WASTE SULFURIC ACID BY DIFFUSION DIALYSIS   总被引:1,自引:0,他引:1  
Intheprocessofsulfuricacidproductionfrompyrite,thefumeproducedinpyriteroastingiswashedwithdiluteacid,andagreatdealofwastesulfuricacidwiththeconcentrationof8%~10%isproduced[1].Thiswastesulfuricacidcannotbeuseddirectlybecauseofitsrelativelyhighimpurity…  相似文献   

13.
0 INTRODUCTIONAproblemofcontinuingandwidespreadinterestinelectromagnetictheoryisthatofelectromagneticradiationorscatteringbyperfectlyconductingobjectsofarbitraryshapelocatedovergroundplane .Itisconvenientandefficienttogiveatreatmentfortheelectromagnet…  相似文献   

14.
Agreatdealoflowconcentrationlyeisoftenproducedinaluminaplantforvariousreasons.Itisnoteconomicaltoreuseitbydirectconcentrationthroughevaporation.Soconcentrationwithmembraneisconsidered.Thelowconcentrationlyeintheredmudmoundwaschosenfortreatment…  相似文献   

15.
Thedislocationemissionfromthecracktipandthenucleationandpropagationofmicrocrackscanbestudiedbyinsitutensiletestunderatransmissionelectronmicroscope(TEM)[1—3].However,thereisnostudyonatomicscalemicrostructureofcracktips,especiallyonthoseofloadedcracks.Fora…  相似文献   

16.
1 IntroductionRareearthelements (REE)areextensivelyap pliedowingtoitsspecialroleasgeochemicaltracer.Theycanprovidemuchgeologicalandgeochemicalinformationsuchascharacterofsourcerock ,coal formingenvironment,andoriginofrock .Rareearthelementsarecommonelement…  相似文献   

17.
0 INTRODUCTIONTheinnerwindingofalargepowertransformerissubjectedtoradialelectromagneticforcesundershort cir cuitconditions .Whentheseforcesexceedacertainlimit,thetransformerinnerwindingbuckles .Soundershort cir cuitconditionsthedynamicbucklingoflargepower…  相似文献   

18.
Complexperovskiterelaxorferroelectricsisakindofspecialdielectricmaterial.Comparedwithnormalferroelectrics,ithasspecialdielectricproperties,e.g.thediffusephasetransition(DPT),astrongfrequencydispersionofthedielectricconstant,polarizationchangingwithtemper…  相似文献   

19.
OfflinehandwrittenChinesecharacterrecognition(referredtoasChinesecharacterrecognitionorCCRforshortinthefollowing)isatypicallargenumberofclassespatternrecognitionproblem.Thepropertiesoflargevocabulary,complexstructureandlotsofsimilarcharacterswhichChine…  相似文献   

20.
Determination of thermal conductivity of magnesium-alloys   总被引:7,自引:0,他引:7  
Thermalconductivityandthermaldiffusivityarecrucialtometallicmaterialsastheyaffecttheheattransferrateintheprocessingprocessandtherefore,influencethethermophysicalperfor manceofthemetalproducts .Therefore ,itisofimportanceformetallurgicalindustrytodetermi…  相似文献   

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