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

2.
0 INTRODUCTIONMonitoringofmachiningprocess ,suchasmoni toringchatterandtoolwearinmilling ,isclassicprob lembasedonsignalprocessing .Signals (suchasvi bration ,forceandacousticemission)collectedbythesensorsaretypicallyaffectedbytheprocessdefects ,processworki…  相似文献   

3.
Applied technique of the cemented fill with fly ash and fine-sands   总被引:3,自引:0,他引:3  
Howtoreducethefillcostisoneofthemostimportantproblemsfacingthemineswhichusece mentedfillmethod .Thekeytothesuccessisfindingcheapersubstitutesofcement.Flyashisthesolidwastesinpowderproducedbyburningcoalinthermalpowerplants.Accordingtostatis tics ,thedisch…  相似文献   

4.
0 INTRODUCTIONAcrackisusuallyregardedasofzero thicknessandinclosecontactwiththemediaoneithersideandthereisnocontactforcebetweencracks.Thecrackscansupportnotonlystressbutalsopullandshearingforce ,sothemediumbetweencrackskeepsthecon tinuumofstressanddispl…  相似文献   

5.
Inrecentyears,intelligentstructuresandsmartsystemshavebecomeahottopic.Becauseoftheirdirectandconversepiezoelectriceffects,piezoelectricmaterialshavebeenwidelyusedtomakevarioustransducersandactuatorsandhaveimportantapplicationsinhightechnologysuchasele…  相似文献   

6.
Electrodematerial,especiallyanodematerial,isadecisivefactorforthesuccessofanelectrolysistechnologicalprocess.Itssuperpotentialvalueisdirectlyrelatedtotheenergyconsumptionofdirectcurrentintheelectrolysisprocess.Itslifespanisthekeyintheindustrializati…  相似文献   

7.
Oneoftheactualproblemsinasolid -statephysicsisnumericalcalculationsofphysicalpropertiesofsolids .Inthisworkwepresentthecomputercode″Dynam icsofcrystallattice″ .Thiscomputercodeisdevotedtothenumericalcalculationsofbasicphysicalpropertiesofcrystal.Theprima…  相似文献   

8.
Metalstructurestakeanimportantplaceingeneralscopeofstructuralconstructions .Theprincipalfieldoftheirusageishigh risers ,largetrussspanstructuresandindustrialbuildingswithcraneequipmentandextremetechnologicalprocess .Incomparisonwithreinforcedcon cretestr…  相似文献   

9.
1 IntroductionChemicalssuchasheavymetalsandorganiccom poundspossiblehaveeffectsontheenvironmentandthreatstohumanhealth .However,agriculture ,industry ,andmedicinerelyontheuseofpreciselythesechemicals .Practicalresolutionoftheseconflictinginterestsrequires…  相似文献   

10.
0 INTRODUCTIONPrecisiondesigninvolvesdesignofmaterials ,me chanics ,electronics ,control,thermal mechanics ,dynam icsandsoftwareandeachfactormayhavesomeeffectonthefinalmachiningaccuracy[1] .Errorsourcesrefertofac torsandlocationsthatcanproducemachiningerrors .…  相似文献   

11.
Recently ,ceramicmaterialshavebeengivenalotofattentionascandidatesforimplantmate rialssincetheypossesscertainhighlydesirablecharacteristicsforsomeclinicalapplicationsofhu manskeletonsubstitution ,heartvalvesrenewing ,dentalcrownrepairing .Ideally ,thephysi…  相似文献   

12.
AlLisystemalloysareoflowerdensity,higherspecificstrength.Buttheyarecharacterizedbylowductilityandfracturetoughness,whichseverelylimittheircommercialapplication.Itisgenerallyagreedthatprimaryfactoroflowtoughnessissliplocationsthatoccurasaresultofworking…  相似文献   

13.
Closecontactmeltingcanbefoundinnatureaswellasinavarietyoftechnicalfieldssuchasmetallurgy,nucleartechnology,welding,especiallyinlatentheatthermalstoragesystemsofsolarenergy,heatpump,airconditioningandspacecrafttechniques,etc.Asphereencapsulatedwithphasec…  相似文献   

14.
Cyclopropylamineisanimportantintermediateforsynthesisofantibioticmedicinessuchasciprofloxacin,profloxacin,sparfloxacin,etc.,andisusedtopreparefinechemicals.Thoughsomeresearchersstudiedthesynthesisofcyclopropylamine,thismethodisnotsuitableforlargescalepr…  相似文献   

15.
Faultstructure ,oftenmadeupofmanyfaultsofdi fferentscales ,issignatureofthecourse ,stateandinten sityofrockfracturing .Becauseofheterogeneityofphysi calbehaviorofrockanddifferenceoftectonicaction ,faultsystemoftenappearsdisorderedandunsystematiconthesurfac…  相似文献   

16.
0 INTRODUCTIONTheloadcharacteristicshavesignificanteffectonsystemdynamicsandthusconstitutethemostimpor tantelementinhighqualitystabilityassessmentin cludingvoltagestability[1] .AlthoughclassicalloadmodelssuchasconstantP Q ,constantimpedanceandconstantcurr…  相似文献   

17.
Electronic structures and properties of V, Nb and Ta metals   总被引:3,自引:0,他引:3  
0 IntroductionTodesignalloysscientifically ,systematicscienceframeofmetalsandalloysincludingthesystematicscienceofpuremetals (one atom (OA)theory) [1,2 ]andthesys tematicscienceofalloys (characteristiccrystal(CC)the ory) [3~ 6 ]areestablished ,whichcangivediagramsof…  相似文献   

18.
0 INTRODUCTIONThereissuchalargenumberofinterfacesinnaturalmediaandengineeringstructuresasthefracturesurfaceinearth’scrust ,theconnectingsurfacebetweenthemachineparts,thecontactsurfacebetweenstructures ,thelayercleavageincomposite ,thecracksurfaceinengine…  相似文献   

19.
0 INTRODUCTIONItiswellknownthatheterogeneousquasi brittleag gregatematerialssuchasconcrete ,rocks ,ceramics ,andvariousparticle dispersedorfiberreinforcedcompositesexperienceanincreaseinfracturetoughnessastheirsizeincreases .Anessentialcharacteristicofquas…  相似文献   

20.
Theproductionofwastesulfuricacidisauniversalprobleminmetallurgicalandchemicalprocess.Atpresent,theusualmethodtotreatitistoneutralizeitbeforedischarging.Buttheneutralizationprocessisnotonlyunabletorecoverthevaluablecomponentsulfuricacid,butalsocons…  相似文献   

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